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Claims  |
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I claim:
1. A dynamic predictive keyboard for communicating information to a
display, comprising:
an input means for use in combination with a plurality of key images and
operative to output select signals corresponding to said key images in
response to one or more of said key images being selected with said input
means by a user, each of said select signals corresponding to an action to
be taken by said keyboard and/or a device in communication with said
keyboard;
predictive means for determining a set of said key images to use in
combination with said input means in response to receipt of one or more of
said select signals, said set of key images including at least one key
image most likely to be next selected by said user; and
means for displaying said key images in association with said input means.
2. A dynamic predictive keyboard as recited in claim 1, wherein said
displaying means is operative to project said key images on said display.
3. A dynamic predictive keyboard as recited in claim 2, wherein said input
means includes a touch sensitive screen overlaying said display.
4. A dynamic predictive keyboard as recited in claim 2, wherein said input
means includes a pointing device operated in associated with said display.
5. A dynamic predictive keyboard as recited in claim 1, wherein said input
means includes a plurality of key switches, wherein said displaying means
includes a plurality of display elements associated with each of sai key
switches, and wherein said displaying means is operative to project said
key images within said display elements.
6. A dynamic predictive keyboard as recited in claim 1, wherein said input
means includes a plurality of key switches, wherein and said displaying
means is operative to project replicas of said key switches on said
display, and wherein said displaying means is operative to project said
key images within said replicas, whereby said user selects one of said key
images by selecting a corresponding key switch.
7. A dynamic predictive keyboard as recited in claim 1, wherein said input
means includes a plurality of key switches, and wherein said input means
further includes means for variably arranging said key switches in a
predefined configuration.
8. A dynamic predictive keyboard as recited in claim 1, wherein said means
for displaying said key images includes means for variably arranging said
key images to be displayed according to a statiscal analysis of key images
selected over a first period.
9. A dynamic predictive keyboard as recited in claim 1, wherein said key
images include text characters corresponding to letters and characters for
writing in a particular language.
10. A dynamic predictive keyboard as recited in claim 9, wherein said input
means includes a plurality of user selectable keys having fixed key
locations, and wherein each of said key images is associated with only a
single key location, whereby key locations associated with said key images
are learned by said user in such a manner so as to facilitate touch typing
using said keyboard.
11. A dynamic predictive keyboard as recited in claim 9, wherein said key
images further include functional icons corresponding to actions to be
taken by said keyboard and/or said device.
12. A dynamic predictive keyboard as recited in claim 11, wherein one of
said function icons corresponds to an action for switcing said key images
from lower case text characters to upper case text characters.
13. A dynamic predictive keyboard as recited in claim 11, wherein said
displaying means is operative to project said text characters on said
display, and wherein one of said functional icons corresponds to an action
for causing said displaying means to delete one or more of said text
characters projected on said display.
14. A dynamic predictive keyboard as recited in claim 11, wherein one of
said functional icons corresponds to an action for causing said displaying
means to manually switch between sets of said key images.
15. A dynamic predictive keyboard as recited in claim 1, wherein said
predictive means includes a set of rules for defining a set of key images
to use in combination with said input means in response to each of said
select signals.
16. A dynamic predictive keyboard as recited in claim 15, wherein said key
images include text characters corresponding to letters and characters for
writing in a particular language, and wherein said set of rules is based
on said language.
17. A dynamic predictive keyboard as recited in claim 16, wherein said
input means further including means for selecting an insertion point for
text characters on said display, said input means being operative to
output a select signal corresponding to a text character preceding said
insertion point, and wherein set of rules includes a rule for defining a
set of key images to use in combination with said input means in response
to each of said select signals.
18. A dynamic predictive keyboard as recited in claim 16, wherein said set
of rules includes a rule for defining a set of key images to use in
combination with said input means in response to one of said text
characters being deleted from said display.
19. A dynamic predictive keyboard as recited in claim 15, wherein said set
of rules includes a rule for defining a set of key images to use in
combination with said input means in response to an operation performed by
said device.
20. A dynamic predictive keyboard as recited in claim 15, wherein said set
of rules is modifiable according to feedback data derived from said
keyboard and/or said device.
21. A dynamic predictive keyboard as recited in claim 20, wherein said
feedback data is statistically derived based on key images selected by
said user.
22. A dynamic predictive keyboard as recited in claim 20, wherein said
feedback data is based on operations performed by said device.
23. A dynamic predictive keyboard as recited in claim 15, wherein said set
of rules includes a rule for defining a set of key images to use in
combination with said input means in response to each text character
selected by said user.
24. A dynamic predictive keyboard as recited in claim 15, wherein said key
images include text characters corresponding to letters and characters for
writing in a particular language and functional icons corresponding to
commands for performing predefined operations, wherein said set of rules
includes a rule for defining a set of key images to use in combination
with said input means in response to combinations of said text characters
and/or said functional icons simultaneously being selected by said user.
25. A dynamic predictive keyboard as recited in claim 15, wherein said key
images include text characters corresponding to letters and characters for
writing in a particular language and functional icons corresponding to
commands for performing predefined operations, wherein said set of rules
includes a rule for defining a set of key images to use in combination
with said input means in response to a series of said text characters
and/or said functional icons being selected by said user.
26. A method for operating a keyboard for entering text on a display,
comprising the steps of:
displaying a first set of key images associated with a plurality of keys,
said key images including text characters, said key images corresponding
to actions to be taken by said keyboard and/or said display in response to
one or more of said keys being selected by a user,
detecting said user's selection of a key on said keyboard or an insertion
point on said display,
determining a best set of key images to next display based on said user's
selection of one or more keys from said keyboard or based on a text
character on said display preceding said insertion point, said best set of
key images including at least one key image most likely to be next
selected by said user, and
displaying said best set of key images in association with said keys.
27. A method for operating a keyboard as recited in claim 26, wherein said
key images are displayed within said keys.
28. A method for operating a keyboard as recited in claim 26, wherein said
keys are key replicas displayed on said display and said key images are
displayed within said key replicas.
29. A method for operating a keyboard as recited in claim 26, wherein said
actions include displaying a text character on said display in accordance
with a key image selected by said user.
30. A method for operating a keyboard as recited in claim 26, wherein said
step of determining a best set of key images to next display includes the
step of switching between sets of said key images in association with said
keys.
31. A method for operating a keyboard as recited in claim 30, wherein said
step of switching between said sets of key images includes the step of
following a set of rules for predictively switching between said sets of
key images.
32. A method for operating a keyboard as recited in claim 31, wherein said
set of rules is based on a language entered from said keyboard and/or an
application performed by a computerized device in association with said
display.
33. A method for operating a keyboard as recited in claim 31, wherein said
set of rules is modified after said keyboard is used according to feedback
data derived from said keyboard and/or a computerized device operated in
association with said display.
34. A method for operating a keyboard as recited in claim 33, wherein said
feedback data is statistically derived based on key images selected by
said user.
35. A method for operating a keyboard as recited in claim 33, wherein said
feedback data is based on actions taken by said computerized device.
36. A method for operating a keyboard as recited in claim 31, wherein said
set of rules includes a rule for determining said best set of key images
in response to said user deleting a text character from said display.
37. A method for operating a keyboard as recited in claim 31, wherein said
set of rules includes a rule for determining said best set of key images
in response to each text character selected by said user.
38. A method for operating a keyboard as recited in claim 31 wherein said
key images include text characters corresponding to letters and characters
for writing in a particular language and functional icons corresponding to
commands for performing predefined operations, wherein said set of rules
includes a rule for determining said best set of key images in response to
combinations of said text characters and/or said functional icons
simultaneously being selected by said user.
39. A method for operating a keyboard as recited in claim 31, wherein said
key images include text characters corresponding to letters and characters
for writing in a particular language and functional icons corresponding to
commands for performing predefined operations, wherein said set of rules
includes a rule for determining said best set of key images in response to
a series of said text characters and/or said functional icons being
selected by said user.
40. A dynamic predictive keyboard and display device, comprising:
a display,
a set of user selectable keys arranged within a predetermined
configuration,
a housing for securing said display and said keys,
means for determining a set of key images to display in association with
said keys after one or more of said keys has been selected by said user,
each of said key images corresponding to an action to be taken by said
device in response to one or more of said keys being selected by a user,
said set of key images including at least one key image most likely to be
next selected by said user, and
means for displaying said set of key images in association with said keys.
41. A dynamic predictive keyboard and display device as recited in claim
40, wherein said key images are projected by said displaying means on said
display.
42. A dynamic predictive keyboard and display device as recited in claim
41, wherein said keys are formed by a touch sensitive screen overlaying a
portion of said display displaying said key images.
43. A dynamic predictive keyboard and display device as recited in claim
40, wherein said keys are hardware switches, wherein said displaying means
includes a plurality of display elements associated with each of said
keys, and wherein said displaying means includes means for displaying said
key images within said display elements.
44. A dynamic predictive keyboard and display device as recited in claim
40, wherein each of said key images is displayed in association with only
one key, whereby a key location associated with each of said key images is
learned by said user thereby facilitating touch typing using said
keyboard.
45. A dynamic predictive keyboard and display device as recited in claim
40, wherein said actions to be taken by said device include displaying
text characters on a display screen.
46. A dynamic predictive keyboard and display device as recited in claim
40, wherein said determining means includes means for storing a plurality
of said key images and wherein said display means includes means for
alternatively displaying different sets of said key images in association
with said keys.
47. A dynamic predictive keyboard and display device as recited in claim
46, wherein said means for alternatively displaying includes means for
manually switching between said different sets of said key images.
48. A dynamic predictive keyboard and display device as recited in claim
40, wherein said determining means includes a set of rules for determining
said set of key images.
49. A dynamic predictive keyboard and display device as recited in claim
48, wherein said set of rules is based on a language being typed from said
keyboard and/or an application being performed by said device.
50. A dynamic predictive keyboard and display device as recited in claim
48, wherein said key images include text characters, and wherein said set
of rules includes a rule for causing said set of key images to be
displayed in association with said keys in response to said user selecting
an insertion point for text characters on said display screen.
51. A dynamic predictive keyboard and display device as recited in claim
48, wherein said key images include text characters, and wherein said set
of rules includes a rule for causing said set of key images to be
displayed in association with said keys in response to said user deleting
a text character from said display screen.
52. A dynamic predictive keyboard and display device as recited in claim
48, wherein said set of rules includes a rule for causing said set of key
images to be displayed in association with said keys in response to an
operation performed by said device.
53. A dynamic predictive keyboard and display device as recited in claim
48, wherein said set of rules is initially predefined before said keyboard
is used and subsequently modified after said keyboard is used according to
feedback data derived from said device.
54. A dynamic predictive keyboard and display device as recited in claim
53, wherein said feedback data is statistically derived based on key
images selected by said user.
55. A dynamic predictive keyboard and display device as recited in claim
53, wherein said feedback data is based on actions taken by said device.
56. A dynamic predictive keyboard and display device as recited in claim
48, wherein said key images include text characters, and wherein said set
of rules includes a rule for causing said set of key images to be
displayed in association with said keys in response to each text character
selected by said user.
57. A dynamic predictive keyboard and display device as recited in claim
48, wherein said key images include text characters corresponding to
letters and characters for writing in a particular language and functional
icons corresponding to commands for performing predefined operations, and
wherein said set of rules includes a rule for causing said set of key
images to be displayed in association with said keys in response to
combinations of said text characters and/or said functional icons
simultaneously being selected by said user.
58. A dynamic predictive keyboard and display device as recited in claim
48, wherein said key images include text characters corresponding to
letters and characters for writing in a particular language and functional
icons corresponding to commands for performing predefined operations, and
wherein said set of rules for includes a rule causing said set of key
images to be displayed in association with said keys in response to a
predefined series of said text characters and/or said functional icons
being selected by said user.
59. A dynamic predictive keyboard and display device as recited in claim
40, and further including at least one user selectable function button
supported by said housing and in communication with said determining
means, said keys and said button being simultaneously selectable by said
user in such a manner so as to cause said device to perform a special
action, said special action being different than said action that would be
performed had one or more keys been pressed without simultaneously
pressing said button. |
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Claims |
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Description |
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FIELD OF THE INVENTION
The present invention relates generally to keyboards and touchpads, and
more particularly to a keyboard for predictively displaying different
character set layouts based upon the last character entered by the user
from the keyboard or an insertion point entered in a corresponding text
field on a display.
BRIEF DESCRIPTION OF PRIOR ART
As microprocessor based devices have been reduced in physical size, a great
demand has arisen for keyboards and/or touchpads ("keyboards") which can
be readily used with such devices, especially for the purpose of standard
English text entry. Several schemes exist for encoding various alphabets
on small keyboards for use with such devices, but these keyboards have not
completely satisfied this demand. For example, a number of handheld
electronic planner/calender products, produced by various Japanese
manufactures, utilize different types of alphabetized keyboards for
entering text. Although some of these keyboards follow the English
character set layout popularized by QWERTY style keyboards ("QWERTY"
stands for the organization of six letters on the second row of the
keyboard), the size of the keys and the spacing between keys have been
reduced to the point that the keyboards can no longer be used for rapid
text entry. Users of such products are forced to use one or two fingers at
a time to type text, which is typically referred to as the "hunt and pack"
method of typing. The QWERTY layout has been used on most typewriters and
computer keyboards and has become the generally accepted standard for
touch typists. Small QWERTY layout keyboards are unacceptable because they
force the use of the "hunt and peck" method of typing, which is
inefficient and uncomfortable to touch typists. Attempts to modify the
QWERTY layout have also met with little success, either because of the
reduced key spacing or size, the bizarre arrangement of the characters in
the layout, or the keystroke methodologyy employed.
Mitsubishi Corp. of Japan produces a cellular phone with a touchpad having
three separate letters assigned to each of the keys, i.e., the key for the
digit 2 has "ABC" as its letters. To select a letter, the user must press
a digit between one to three times, depending on the letter to be
selected. This technique requires an average of two keystrokes to be
performed per letter.
A Federal Aviation Agency telephone interactive information system uses a
touchpad that requires the user to first press the digit for a group of
three letters, then indicate the letter to be selected from within the
group by pressing a key in one of the three columns of keys, i.e., "1" for
the first letter, "2" for the second letter, or "3" for the third letter.
This scheme requires that at least two keystrokes be performed per letter.
In the mid-1960's, SRI International produced a chord keyset, having five
piano like keys that could be pressed simultaneously to produce different
characters. Each stroke of the keyset was a combination of the five keys
that stood for that one letter. The user of the keyset was required to
learn a completely arbitrary set of chords for the letters, and was unable
to look at the keys if a combination for a letter was forgotten. Only 32
distinctive characters could be typed using the five keys.
U.S. Pat. No. 4,885,580, issued to Noto, et. al., describes a
multi-function key input device having a fixed display section and a
variable display section. The variable display section displays differing
information, under the control of a central processing unit, for each of a
number of different operating modes, which may be specified by selecting
one or more of the fixed display keys.
There have also been numerous attempts to combine a standard key entry
system with a display, so as to further reduce the amount of space
required by the keyboard and to make the keyboard more dynamic. For
example, a number of touch-sensitive displays, having dynamically
interchangeable character set layouts, have been produced for use as
keyboards. Although the character set layouts of such displays may be
dynamically interchanges, the different character set layouts are only
exchanged in response to specific user initiated commands.
A different type of dynamic keyboard, aimed at removing the need for finger
respositioning, as required on standard keyboards, was forwarded in U.S.
Pat. No. 4,333,097, issued to Buric, et. al. This patent describes a
10-key keyboard having blank keys for use in combination with one or more
replicas of the 10 keys displayed on a CRT. The characters and
organization of characters displayed within each replica row was
determined by the relative frequency of usage of each character in common
English and the strength of the operator's finger required to type each
key in a row. To shift between the fixed-character rows on the display,
the operator was required to push either an upshift or downshift button
which would when cause the active replica row to shift up or down
accordingly on the display. This approach was reported to require about
1.5 keystrokes per character typed.
Another type of dynamic keyboard is described in an article by Joe Becker,
entitled "User Friendly Design for Japanese Typing", Xerox Office Systems
Division Report No. OSD T8301, August 1983. The Becker article, at page
15, describes a virtual keyboard, like that of Buric, which was designed
to reduce the number of hardware keys required to type a particular
language. The software system which operated this virtual keyboard was
implemented in a PC-based system named the Fuji Xerox 8012-J Star. The
keyboard was developed to allow the average Japanese person to learn and
use a PC for everyday typing. Such a keyboard was required because the
Japanese script uses up to 6,000 Chinese ideograms (kanji), 170 Japanese
syllabic characters (kana), various Roman letters, and Arabic numerals.
To operate the keyboard, a user would type a Japanese word, such as
"shiyousareteiru", from a mechanical QWERTY-style keyboard, and then press
a lookup key. The PC would then analyze the typed word and display several
different Kanji characters corresponding to the phonetic word, such as the
homophones "used", "tried out", "bred", eliminated", and "put to personal
use", on a displayed replica of the mechanical keyboard. The keyboard
replica did not, however, always exactly resemble the mechanical keyboard.
For example, when a long word was to be displayed, the replica would
combine a number of keys in a row into one long key so that the homophone
could be displayed in an uninterrupted manner. To select the appropriate
group of Kanji characters, the user would then press any of the keys
assigned to a particular homophone. If more than eight homophones existed
for the typed word, the user would need to press the lookup key again to
have those words displayed. Frequency tables were implemented in this
system so that the most frequently used homophones were always shown
first. In addition, under this system, kanji words would always appear on
the same keys, independent of their reading in a given context, thereby
facilitating touch typing. Although Buric and Becker describe dynamic
virtual keyboards, neither describe or suggest a reduced key dynamic
keyboard capable of predicting a user's next move and providing a
character set layout which corresponds to that prediction.
SUMMARY OF THE INVENTION
A preferred embodiment of the present invention comprises a keyboard having
the ability to predictively display different key images in association
with its various keys, within a variety of predefined sets of key images,
based upon either the character preceding an insertion point entered in a
corresponding text field on a display or the last key image entered from
the keyboard. Although each key of the keyboard is capable of displaying
numerous different characters, each key represents only one character at a
time and each character is displayed at only one key. The user can also
manually change character set layouts. When a user selects a particular
key or selects an insertion point within the text field, all keys are
updated to display a character set layout that corresponds to the set of
characters from which the user would be most likely to select a character
from next, based upon the frequency of the particular character
combination being used in either a particular language or application. The
organization of the characters within each character set layout is also
based on the frequency of those characters being used in either a
particular language or application. The keyboard can be implemented to
operate as either a touch-sensitive display or as a collection of
interactive images on any of a number of different displays. The keyboard
can also be used in conjunction with the special function keys or buttons
that are common to computer system for performing function-character
command operations.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a representation of a dynamic predictive keyboard, in combination
with a hand-held display device, illustrating a partially blank character
set display screen and a blank text display screen, in accordance with the
preferred embodiment of the present invention;
FIG. 2 is a block diagram of a computer system for use with the dynamic
predictive keyboard of the present invention;
FIGS. 3a through 31 are representations of the different character set
layouts which can be displayed in accordance with a preferred embodiment
of the present invention; and
FIGS. 4, 5 and 6 illustrate a method for implementing the dynamic
predictive keyboard of the preferred embodiment of the present invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENT
A dynamic predictive keyboard, as used in combination with a handheld
display device, and for use in such devices as calculators, computers,
appointment books, inventory recorders, telephones and the like, is herein
disclosed. The keyboard and the display device, generally shown as 10, are
illustrated in FIG. 1. The display device is comprised of a text display
screen 12, a character set display screen 14, and various well known
electrical components required to operate those displays contained within
the housing 16. Also connected to the housing 16 are shift buttons 18, on
either side of the housing, a control button 20, and an option button 22.
The keyboard of the present invention is displayed within the character
set display screen 14 and includes a number of dynamic key locations 24
which can be variously controlled by the display device 10 to display
different key images or characters within the display screen space
allocated to each key. If desired, a number of the keys 24 can be set to
display particular key images until reset. For example, as shown in FIG.
1, key 26 has been set to display the English word "Flip" and key 28 has
been set to display the abbreviation "Del" for the English word "Delete".
It should be noted that although the keyboard and display device 10 are
shown as an integrated handheld, touch sensitive unit throughout this
description of the preferred embodiment, a keyboard having the basic
elements of the present invention could also be displayed on any standard
type of display, such as CRT or LCD, or incorporated into any environment
where it was possible to dynamically change the character set layout
corresponding to the keys. Although a separate display area should
typically be reserved for the keyboard, the keyboard could be shown in the
same area as the text when necessary. When the keyboard is utilized on the
screen of a standard display using replicas of the keys and/or interative
software-based images, the keys and buttons can be activated by a pointing
device or cursor control device, such as a mouse. For example, control
button image 20 could be selected by simply positioning the cursor over
the button and depressing the selection button of the mouse to select the
contrl function. Alternatively, a set of hardware key switches could also
be used. In one embodiment, individual display elements would be
positioned within each switch for displaying the different key images. In
a second embodiment, the switches would be left blank, but the hardware
keyboard would be operated in association with a display upon which
replicas of the keys and the various key images could be projected.
Regardless of the manner in which the present invention is implemented, the
basic operation of the keyboard system and the software and electronics
which allow it to operate, can be described with reference to the block
diagram of FIG. 2. The character set display screen 30 displays sets of
the key images (character set layouts) that were selected to be displayed
by the central processing unit (CPU) 32 and acts as an interface between
the user and the keyboard system. In the preferred embodiment, the display
device screens 30 and 40 are composed of touch sensitive overlay screens
in combination with display units, the operations of which are well known
to persons of ordinary skill in the computer arts. When a user selects a
particular key or button from the character set display screen 30 or
selects an insertion point from within the text field of the text display
screen 40, a select signal corresponding to the selected character,
function key or button, or the character preceding the insertion point, is
output to the CPU 32 for processing. If the user selected a particular
character to be displayed or a particular insertion point, the CPU 32
would analyze the select signal, determine (predict) the next character
set layout to be displayed based upon that select signal (layouts are
stored in memory 36), display the next character set layout in the
character set display screen 30, and display the character corresponding
to the select signal in the text display screen 40. Character definitions
and character set layouts are drawn from memory 36 when appropriate. As
previously stated, the designations for display screen 30 and display
screen 40 could easily correspond to the same display screen if desired.
With reference now to FIGS. 3a through 31, representations of the different
character set layouts D1 through D12, which are shown in these figures as
they would be displayed within the character set display screen 30 in
accordance with the preferred embodiment of the present invention, are
shown. As explained above with reference to the prior art, the standard
English language keyboard for typing is the QWERTY keyboard. The QWERTY
keyboard has a total of forty nine keys, including Shift and Return (or
Enter) character keys, but not including Tab, Caps Lock, or Delete
character keys, and not including any of the other character keys which
are commonly used on computer keyboards, such as Control, Option, Function
1 through 15, etc. These forty nine keys, together with the shift key,
allow users to type all 26 letters of the English language, in both upper
and lower case, the 10 digits of our standard numbering system, the 32
punctuation marks and symbols most commonly used in English, and Space,
Backspace, Return, and Tab.
An object of the present invention is to reduce the number of keys required
on a keyboard, thereby reducing its size, without significantly increasing
the number of keystrokes (typed keys) required to type all of the
characters of the QWERTY keyboard. The present invention meets this
objective by providing a keyboard having a minimal number of keys while
providing all of the characters of a QWERTY keyboard and minimizing the
number of keystrokes to type the characters of the QWERTY keyboard. In the
present invention, unlike a standard fixed keyboard, some if not all of
the keys are dynamic, in that they have the ability to display different
characters while the keyboard is in use. Hence, each key may represent
several letters, digits, or symbols. Although different arrangement are
quite possible, each key typically only represents a single character at a
time and each character is typically only displayed at one key location.
In addition, the user has the ability to manually cause the set of
characters being displayed to change, such as by selecting either the
Shift, Flip or Delete characters, which are fixed characters further
described below, or to predictively change the character set layout by
simply selecting a character to be typed.
When a user selects a key, all of the keys are updated to display the set
of characters which would most likely be used by the user to type another
character. The choice of what character set layout to display next is
based on the frequency of character combinations typically used by the
machine or the particular application with which the keyboard is being
used. For example, in the preferred embodiment of the present invention,
as implemented in English, one particular character set layout is
displayed after the user types a consonant and another is displayed after
the user types a vowel. Character set layouts could also be based on
exactly which letter was typed last, which would yield some twenty-six or
more character set layouts. The order of these layouts can either be based
on statistics relating to the particular language being used, which is
further explained below, or on specific applications running on the
particular machine with which the keyboard is being used.
By typically displaying each character at only one key location, a user can
gradually learn where each of the characters should appear, thereby aiding
in the development of touch typing with the keyboard. This is also true
because each specific sequence of letters always has the same sequence of
keystrokes. For example, the word "computer" may always be
typed"c-o-m-Flip-p-u-t-e-r", which allows the user to consciously or
subconsciously learn to type sequences of keystrokes for words, as do
touch typists. The word "Flip" refers to the Flip key 26 of FIG. 1, which
can be selected by the user to cause the keyboard to manually change
character set layouts. In the example, the user knew that a "p" would not
automatically appear after the "m" was typed, so that user pressed the
Flip key to manually cause a character set layout having the "p" character
to appear. The only letter that was not predicted in the example was the
letter "p", hence, the Flip key only had to be pressed once.
The layout of the character sets and organization of the layouts for the
preferred embodiment of the present invention were determined using a
statistical analysis. The purpose of this analysis was to calculate the
frequency of various letter combinations in the English language so as to
derive character set layouts which would represent the most likely
characters to be used. A database of standard text was analyzed to
determine which characters were most commonly used amongst all of the
characters of a QWERTY keyboard. The most commonly occurring characters
were then analyzed using the same database to determine which characters
were most likely to follow each of the most commonly occurring characters.
This same analysis format was then repeatedly used to determine the most
common characters following different sets of characters, vowels,
consonants, etc., until the character sets D1 through D12 of the preferred
embodiment were derived. Through careful selection of the character sets
to display after each keystroke, the number of Flips or switches required
to produce a desired character can be kept low. For example, out of a
sample of 130,880 characters, it was determined that only 18,800 flips, or
14.36% extra keystrokes, were required to enter the text using the
character set layouts of the preferred embodiment. Hence, for typical
English text or numeric input, fewer than 20% of the user's keystrokes
would be Flips, resulting in fewer than 1.2 keystrokes per letter typed.
This same analysis can equally be applied to diffferent languages,
different usages within a particular languagek, or other particular
applications, so as to derive character set layouts which provide the
greatest efficiency (the least number of keystrokes per character). Hence,
because the type of text being typed may cause the most commonly required
keystrokes to change, the character set layouts of FIGS. 3a-3l are only
presently believed to be the best mode of practicing the present invention
with respect to the English language as used at this time. It is
impossible to say whether these character set layouts represent the
optimum arrangement of characters possible in every instance or will
continue to do so in the future. For example, in the above mentioned
sample, the largest contribution to the number of flips required was
caused by typing a "p" after a space, which accounted for 583 flips.
Hence, in some instances, it may be necessary to switch one or more of the
characters on the character set layout D1, which forms the first layout
displayed, with different characters, such as a "p", so as to reduce the
number of keystrokes required to reach that particular character. It is
therefore highly desirable to provide a user with the ability to
individually select the composition and order of character set layouts.
The composition and order of character set layouts may be selected in many
different manners. Some users may wish to establish character set layouts
in their own particular fashion, while others may wish to simply use an
initial default layout which can be subsequently modified according to
various feedback data relating to previously selected key images, or
actions performed by the keyboard or controlled device as a result of key
image selections. For example, a processor performing the predictive
operations of the keyboard could be programmed to suggest different
character set layouts after a user had used the keyboard while set in a
default mode over a first period.
In the character set layouts of the preferred embodiment, illustrated in
FIGS. 3a-3l, three particularly important keys, the "Delete" key 28, the
"Return" key 42 and the "Flip" key 44, were added as fixed characters
within each of the twelve character sets. The "Shift" key could also be
added as fixed character to these character sets, rather than as the
button depicted in FIGS. 1 and 3, if a particular embodiment did not
support buttons. The Flip key, as briefly described above, provides the
user with the ability to switch between difference character set layouts
when a desired key is not found to be immediately available on the layout
present being displayed.
Returning now to the actual composition of the layouts D1 to D12, it should
be noted that layouts D1, D3, D5, D7, D9 and D11 correspond to all of the
lower case characters from the QWERTY keyboard and that layouts D2, D4,
D68 D8, D10 and D12, which match the character set layouts of the odd
numbered character set layouts, corresponding to all of the upper case
characters from the QWERTY keyboard. The character set layouts are
displayed within the character set display screen 14 so that layout D1 is
the default layout. The basic rules for determining which of the character
set layouts are to be displayed after a keystroke are as follows:
(1) After the user types any vowel, Space, Return, Tab, Single Quote,
Double Quote, ")" or "(", then character set layout D5 is to be displayed.
(2) After the user types any character in the set "0123456789+-/*=", then
character set layout D11 is to be displayed.
(3) After the user types any remaining character, then character et layout
D1 is to be displayed.
Additional rules, which will be explained below with reference to Tables
2,3 and 4, apply after the user types a Shift key 18, a Flip key 44, or
the "Caps Lock" key 46.
With reference now to FIGS. 4 through 6, the operation of the keyboard in
association with the display device 10, or any dynamic predictive
keyboard, is described. FIG. 4 illustrates a first portion of a method for
implementing the dynamic predictive keyboard in accordance with the
preferred embodiment of the present invention, and in particular with
respect to a method for handling select signals corresponding to
functional icons representing Control and Option commands and Shift and
Flip key selections. When the display device 10 is activated, the
electronics system associated with the device, as generally described in
FIG. 2, initially starts off by waiting, block 50, for the user to either
select a character key 24 or select an insertion point within the text
field of the text display screen | | |
