An analogue display includes an electrical sensitive medium enclosed between two sets of electrodes. The two sets of electrodes are registered and overlap to provide background and one or more shaped index characters, each at a plurality of selectable positions. Voltage signals are applied to the electrodes so that the medium is held in an OFF state in the region between selected electrodes, while simultaneously voltage signals are applied so that in other regions of the medium, the medium is in an ON state. The medium may be of liquid crystal, electroluminescent or gaseous material. One set of electrodes may have a meander configuration, the other set a segmented configuration. The index character or characters may be displayed at one, two or three positions, each character being of different shape, for meter or timepiece applications. The voltage signals applied may be binary coded and in preference pseudo-random sequence binary codes.
Disclosed is a display device which comprises a pair of plate-like light transmittable members; a display member located so as to form a predetermined pattern between a pair of light transmittable members, the display member being composed of a material whose light transmittance is electrically changed; and a pair of light transmittable electrodes, at least one of a pair of light transmittable electrodes having a shape corresponding to the pattern, a pair of light transmittable electrodes being formed on a pair of light transmittable members and for electrically controlling the material. The camera having the display device comprises illuminating means for illuminating the display portion. The display portion is illuminated in accordance with a luminance of a subject. The illuminating light can be also used for measuring a distance and for illuminating another display element.
4527863 - Electronic displays - Owned by The Secretary of State for Defence in Her Britannic Majesty's Government (London,GB2)
A polar co-ordinate display of full 360.degree. arc comprised of electrode bearing substrates each side of a layer of dyed phase change liquid crystal material. One set of electrodes comprises concentric spirals, the other set comprises radials. The display is multiplex addressed using four select waveform signals. These four signals V.sub.1, V.sub.2, V.sub.3, and V.sub.x satisfy the following conditions: where V.sub.p is an upper threshold voltage, and V.sub.0 a saturation voltage for dyed phase change hysteresis, and may be of the coded form; V.sub.1 =,1010,; V.sub.2 =,1100,; V.sub.3 =,0101,; V.sub.x =,0110,. These may be generated using two 2-bit registers with exclusive OR-gate feedback.
A watch display comprises time display hands (3, 4) and a reflecting digital display (5) which acts as dial for the hands, the display being transparent under the effect of an electric field and opaque in the absence of the field.
A liquid crystal cell including chiral nematic liquid material with negative dielectric anisotropy. The cell is placed between two orthogonal polarizers. In the absence of an applied field, the liquid crystal molecules assume a homeotropic alignment. The liquid crystal molecules assume a twisted pattern in the field-on state.
An electrooptical system contains: (a) a twisted nematic liquid-crystal layer, with an input side and an output side, which is positioned between a first substrate and a second substrate, each of whose inside surface is provided with an electrode coating and an alignment layer thereon, the director of said liquid crystal layer having a parallel edge alignment and a twist angle of 0.degree..ltoreq..beta..ltoreq.1000, (b) at least one compensation layer for compensating the optical path difference of the liquid-crystal layer d.multidot..DELTA.n, and (c) at least one device for linear polarization of light in such an arrangement that light, before entering and after exiting the liquid-crystal layer, passes through a polarization device, I. wherein, in order to achieve high contrast, and/or high brightness, and/or high viewing angle independence of the contrast and/or the color values, the angle .psi., which the polarization device on the input side of the liquid crystal layer forms with the director of the liquid-crystal molecules on the surface of the first substrate, satisfies I.A. condition (1) or (2) where a polarization device is present on both the light input side of the liquid crystal layer and the light output side of the liquid crystal layer, and the polarization device on the output side of the liquid crystal layer is rotated by 90.degree..+-.10.degree. with respect to the polarization device on the input side of the liquid crystal layer, and, optionally, alignment of the polarization devices on the input side and the output side of the liquid crystal layer are interchanged, or satisfies I.B. condition (3) or (4) where a polarization device is only present on the input side, II. wherein the compensation layer comprises a material having three optical refractive indices, of which one is less than the other two, and wherein the optical axis corresponding to this lowest refractive index is essentially parallel to the surface of said second substrate or forms an angle of 2.degree.<.gamma.<60.degree. with the surface of said second substrate, as a result of which, the angle between the optical axis of the compensation layer and the optical axis of the liquid-crystal layer, upon application of a voltage, passes through a minimum, and III. wherein the plane set up by the two other refractive indices forms an angle of between 30.degree. and 150.degree. with the director of the liquid-crystal at the surface of the second substrate.
