JPS59109029A - Liquid crystal display device for full color display - Google Patents

Abstract

PURPOSE:To obtain a titled device that can display any color by mixing of three primary colors and gives good color tone by arranging minute flat platelike micro-convex lenses for each of groups consisting of picture elements of three primary colors provided on transparent electrodes. CONSTITUTION:A twist nematic liquid crystal 6 is sealed between an upper glass substrate 1 provided with a group 2 of transparent electrodes and a lower glass substrate 3 provided with a group 4 of transparent electrodes and a group of color filters (5a denotes a red filter, 5b denotes a green filter and 5c denotes a blue filter). A polarizing plate 7 and a diffusion place 8 are placed on the glass substrate 3 (9 denotes a light source). Each of flat platelike microconvex lenses formed on the upper glass substrate 1 are allowed to correspond to each element consisting of three primary colors of color filters. Accordingly, by applying voltage selectively between upper and lower electrodes of the device, a desired color display of good color tone can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a liquid crystal display device for full-color display in which color filters of three primary colors, red, green, and blue, are alternately arranged on a transparent electrode.

<Prior Art> Conventionally, a full-color liquid crystal display device has been proposed in which color filters for the three primary colors of red, green, and blue are incorporated into a liquid crystal layer to display an arbitrary color by mixing the three primary colors. However, conventional full-color liquid crystal display devices allow the eye to synthesize and recognize any color by controlling the amount of transmitted or reflected light from each pixel of the three primary colors. It did not create pixels.

<Objective> The object of the present invention is to synthesize pixels of three primary colors by incorporating relatively compact optical components, and to obtain a full-color display with excellent color tone.

<Example> Hereinafter, an example of a liquid crystal display device for full color display according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is an explanatory diagram of the configuration of an embodiment of a liquid crystal display device for full color display according to the present invention. 1 is the J-side glass substrate,
2 is a group of transparent electrodes formed on one surface of the upper glass substrate; 3
4 is a transparent electrode group formed on the lower glass substrate 3, and 5 is a color filter group formed on the transparent electrode group 4-. The color filter group 5 is composed of a red filter 5a, an auspicious green filter 5b, and a blue filter 5c. These color filter groups 5 are manufactured using methods such as photo process, screen printing, pad printing, etc. to a thickness of O1 to 0.3μ! It is formed to have a thickness of about n.

Upper glass substrate 1 on which transparent electrode group 2 is formed. An alignment film is coated on the lower glass substrate 3 on which the transparent electrode group 4 and the color filter group 5 are formed, and both glass substrates 1.3
The spacing is kept at about IO μm. The gap is filled with a guest-host liquid crystal 6 containing a black dichroic dye. The guest-host liquid crystal 6 has an alignment structure twisted by 90 degrees. A polarizing plate 7 and a diffusing plate 8 are attached to the back surface of the lower glass substrate 3, and a light source 9 is arranged behind them.

A red filter 5a, a green filter 5b, and a blue filter 5c on the side of the upper glass substrate 1 facing the guest-host liquid crystal 6
A flat micro-convex lens 10 is formed at each position covering the three color pixels formed by. In this flat micro convex lens 10, one flat micro convex lens IO is positioned corresponding to an element composed of three color filters.

Next, two types of steps for forming the flat micro-convex lens IO will be explained.

(1) Electric field transfer method: A mask is applied to the upper glass substrate 1 except for the convex lens formation portion (corresponding to 10 in FIG. 1), and the upper glass substrate I is exposed to high temperature TI! By applying an electric field above and below the upper glass substrate 1 by soaking it in a molten salt such as 2so4, Na+ ions with a small electronic polarizability of 20 and + ions with a small electronic polarizability of Na2O contained in the second glass substrate 1 are applied. Exchange with larger Tl+ ions. The refractive index of the portion where the Tl+ ions are exchanged becomes larger than that of the initial glass body, and therefore a flat micro-convex lens is formed. Here, the planar shape of the flat micro-convex lens IO is circular,
Various shapes corresponding to the shape of the color filter group 5 may be used, such as an elliptical shape and a rectangular shape. An insulating material such as 5i02 is coated on the second glass substrate l on which the flat micro-convex lens 10 is formed, and then three or more transparent electrodes 2 are formed corresponding to the size of the flat micro-convex lens 10.

(11) Ion beam method: This method is particularly proposed by the present inventor. A mask is applied to the upper glass substrate 1 except for the convex lens formation portion (corresponding to 10 in FIG. 1), and positive ions (1-l+, Th2+, Th2+, Ta5′+
, Ba2+, La3+, cd2+, Ti4+) beam,
Alternatively, a convex lens is formed by irradiating with a negative ion (Te2-, 5e2-, 52-) beam.

Alternatively, a convex lens is formed by irradiating the upper glass substrate 1 with a microbeam of ions having a large electronic polarizability controlled by an electromagnetic field while the -11 side glass substrate 1 is not masked. Alternatively, positive ions (B3+) having a smaller electronic polarization than Na+ ions are placed around the convex lens forming portion of the glass substrate l on the negative side.

A convex lens is formed in the convex lens forming portion by irradiating the Be2+, Li+, Si", AI!"+) beam.

FIG. 2 is a diagram illustrating the configuration of another embodiment of the liquid crystal display device for full color display according to the present invention. 11 is an upper glass substrate, I2 is a transparent electrode group formed on the entire surface of the upper glass substrate 11, and 13 is a color filter group formed on the transparent electrode group 12. The color filter group I3 is composed of a red filter 13a, a green filter 13b, and a blue filter 18c. I4 is a lower glass substrate, and I5 is an electrode group (or a thin film transistor array including a reflective layer) formed on the lower glass substrate 14 surface. Transparent electrode group 12
and an upper glass substrate I on which a color filter group 13 is formed.
I, and a lower glass substrate 1 on which a transparent electrode group 15 is formed.
An alignment film is applied on top of 4, and both glass substrates II, 14
The spacing is kept at approximately 10 μm. Then, the gap is filled with a guest-host liquid crystal 16 containing a black dichroic dye. The initial orientation of the guest-host liquid crystal 16 is a focal conic orientation in which the helical axis is approximately perpendicular to the substrate surface. A positive ion beam having a smaller electronic polarization than Na+ ions is irradiated onto a predetermined position on the side of the second glass substrate 11 that does not face the guest-host liquid crystal 6, and is formed by a red filter 13a, a green filter 13b, and a blue filter +8c. A flat micro convex lens 17 is formed at a position covering the pixels of three colors. This flat micro convex lens 17 is formed so that one flat micro convex lens 17 is positioned corresponding to one element composed of three color filters.

In the above two embodiments, when no voltage is applied between the lower electrodes, the display is black, and when all the voltages are saturated voltages, the display is white (colorless), and the electrodes corresponding to each color filter are displayed as black. When appropriate different voltages are applied, the desired color will be displayed.

Here, in the two embodiments described below, the liquid crystal mode was guest host, but other liquid crystal modes, namely TN-FEM
It doesn't matter.

<Effects> According to the present invention, any color obtained by mixing three primary colors can be displayed, and a display device with good color tone can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the construction of one embodiment of a liquid crystal display device for full color display according to the present invention, and FIG. 2 is an explanatory diagram of the construction of another embodiment. In the figure, l, II: upper glass substrates 2, 4, 12: transparent electrodes A□. 8, 14: Lower glass substrate 5.18: Color fill group 6.16: Guest host liquid crystal 7: Polarizing plate 8
: Diffusion plate 9: Light source

Claims (1)

[Claims] A liquid crystal layer is arranged between 12 substrates, a transparent electrode is formed on the surface of at least one of the two substrates, and on the transparent electrode, three primary colors of red, green, and blue are arranged. In a full-color liquid crystal display device in which color filters are alternately arranged in parallel, the red and green colors of the substrate. A liquid crystal display device for full color display, characterized in that a minute flat micro convex lens is arranged at a position covering three pixels formed by a blue color filter.