There is provided a reflection type liquid crystal display including (a) a first substrate having a roughened surface, (b) a second substrate spaced away from the first substrate in opposing relation to the roughened surface of the first substrate, (c) a liquid crystal layer sandwiched between the first and second substrates, (d) a metal film formed on the roughened surface of the first substrate for reflecting lights therefrom, (e) a transparent dielectric film formed on the metal film, the transparent dielectric film having a planarized upper surface, (f) a plurality of transparent pixel electrodes formed on the transparent dielectric film, and (g) a plurality of switching devices formed on the transparent dielectric film, each of the switching devices being electrically connected with each of the transparent pixel electrodes, the transparent pixel electrodes and the switching devices being arranged in a matrix. The above-mentioned reflection type liquid crystal display makes it possible to provide an excellent light diffusion and reflection function without special technique. In particular, it is possible to reduce the number of photolithography steps for fabricating an active matrix type substrate, ensuring lower fabrication costs and a higher fabrication yield.
A substrate is provided with a light reflecting film in which the depths of a plurality of concave portions formed on the surface of the base or the heights of a plurality of convex portions formed on the surface of the base are substantially equal, the planar shapes of the plurality of concave portions or the convex portions are overlapped circles and overlapped polygons, or any one of the aforesaid circles and polygons, and a plurality of concave portions or convex portions are randomly arranged over a plane, the substrate with the light reflecting film being prepared by using a mask comprising light-transmitting parts or non-light-transmitting parts formed by a plurality of dots less than the number of the dot regions as one unit, in which the light-transmitting parts or the non-light-transmitting parts are randomly arranged in the unit, and a plurality of the one unit is repeated.
For reducing thickness of a liquid crystal display device in a depth direction thereof, the present invention provides a liquid crystal display device comprising a liquid crystal display device and a backlight unit disposed behind a liquid crystal display panel, wherein a reflector of the backlight unit has a wavy surface at rear side thereof, and a circuit board on which electronic components are disposed is fixed at the wavy rear surface of the reflector, so that the electronic components are located between the circuit board and a concave portion of the wavy rear surface of the reflecting plate.
In order to realize the manufacture of a reflection type liquid crystal display in the same manufacture processes as those of a transmission type liquid crystal display, a photolithography mask capable of forming both a gate electrode 22 and a reflective layer 23, and a photolithography mask capable of forming only the gate electrode 22 are prepared, and by using either one of the masks, the reflection type liquid crystal display in which both the gate electrode 22 and the reflective layer 23 are formed on a transparent insulation substrate 21, and the transmission type liquid crystal display in which only the gate electrode 22 is formed are selectively manufactured.
The invention provides a liquid crystal display device having a structure in which light reflection on lines can be suppressed and reduction in contrast of the liquid crystal display device can be prevented without providing a shielding film on a color filter of an opposite substrate portion. In the liquid crystal display device according to the invention, a shielding film is not provided in a color filter provided on a substrate on the opposite substrate portion side. A signal line is formed of a transparent conductive material such as ITO, amorphous ITO or the like. Consequently, light incident from the surface of the liquid crystal display device passes through the back face of the liquid crystal display device without causing surface reflection even if the light hits upon the signal line in an interval between pixel electrodes. Consequently, it is possible to prevent reduction in contrast caused by the light reflected on the signal line.
A flexible liquid crystal display comprising two plates that are substantially parallel to each other. Each of the plates includes a polymeric substrate having a roughness of up to about 5 nm, a barrier coating disposed on a surface of the polymeric substrate, and a transparent conductive layer disposed on a surface of the barrier coating opposite the polymeric substrate. A liquid crystal material is interposed between the two plates, such that the liquid crystal material contacts the transparent conductive layer on each of the two plates. The invention also includes a barrier coated polymer sheet for use in a liquid crystal display having a polycarbonate substrate with a roughness up to about 5 nm and a barrier coating, such as silicon nitride or silicon oxide, having a density of at least 1.8 g/cc disposed on a surface of the polycarbonate substrate. A method of making the barrier coated polymer sheet is also described.
