JPS60159827A - Color liquid crystal display panel - Google Patents

Abstract

PURPOSE:To obtain a color liq. crystal display panel of high quality with superior color reproducibility by forming a dielectric layer consisting of parts having different thicknesses corresponding to color filters on an electrode. CONSTITUTION:A liq. crystal layer 11 is held between substrates 1, 3 having electrodes 32, 13 and orienting layers 10, 12, respectively. At this time, color filters 34 corresponding to the three primary colors R (red), G (green), B (blue) are formed on the substrate 1, and a dielectric layer 33 consisting of parts having different thicknesses is formed on the electrode 32 on the substrate 1. The thicknesses tR, tG, tB correspond to the color filters R, G, B, and they are increased (tR>tG>tB) in accordance with an increase in selected wavelengths (R, G, B).

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a color liquid crystal display panel composed of a color separation part and a liquid crystal optical switch, and the present invention relates to a color liquid crystal display panel composed of a color separation part and a liquid crystal optical switch. 1 series.

1] Prior art and problems] Optical rotational dispersion will be explained using a conventional example. l+: Figure i does not show a cross-sectional view of the color liquid crystal display panel. 1.3 (upper basal root,
2 is twisted nematic liquid A (T N liquid crystal) 11
Between 1.3 and 1.3 of the cutting board, there is an old Nshiro seal, 4 and 5.6 are filters that transmit red, green, and old colors, respectively, and 7.8
．． Reference numeral 9 denotes polarization for driving liquid crystal disposed at a position corresponding to the filter; 13 denotes a liquid crystal; 196 a counter electrode for driving; 10.
12 is a distribution layer for liquid crystal alignment. The operation W and filling are as follows. This discrepancy is based on the contents of the table and the LCD drive
Select the electrodes 7.8.9 for 11 [7] By applying the voltage to the filter 4.5.6, the input light 16 is separated into colors a ti, te (↑ra, ta, red, green, By controlling the blue light SAI I tag and outputting light 17,
Fly a colored kite.

In the conventional panel, the red color is emphasized and displayed in either a straw or sepia tone, and the fidelity of color reproduction is significantly reduced. The reason for this is that the optical rotation angle and therefore the light transmittance in the liquid crystal cell varies depending on the wavelength of the light. Explanation 1' in Figure 2 1. How many months is applied to the electrode 7 corresponding to the red filter, and the output light 17V when the red light is transmitted 1B is the applied voltage per month, and the vertical axis 19 (Suemitsuhiro N1) is 21.8 for green, and 22 for color. It is output in voltage state (a).

In matrix driving using the voltage averaging method, the effective value 'dλ river 24 of the on pixel and the effective value pressure 23 of the off pixel are common to the liquid crystal optical switches corresponding to each color filter.

When the effective value of the ON pixel is applied, the transmitted light intensity of red is at the intersection 25 of 20 and 24 in Fig. 2, which is greater than point 26 for green and point 27 for 111' color. 8
In other words, the displayed image becomes reddish.

[Purpose of the invention]

The present invention solves this problem by providing a dielectric layer with different widths on the electrode corresponding to each color filter. Providing quality color LCD display panels. Below-1 will be explained based on the drawings.

[Embodiments of the invention]

FIG. 3 is a cross-sectional view of a color liquid crystal display according to the present invention. Between the board 1 and the LCD, 1,
11 is sandwiched between the poles 16 and 16 on the substrate.
62, alignment layer 10.12 and color filters 64 corresponding to the three primary colors 1 (, (i, 1-ta) have been formed.

Features of this embodiment (1) Dielectric layers having different thicknesses of >XB are provided on one substrate (corresponding to various points) 5,
The dielectric layer thicknesses t n, t, I, and 1□ are synchronized with the color filter red 1 (, green G, and blue 13), and the thickness is also different from that of the long selected wavelength (1 (, C'+, B)). Largely (ti
> t, > tll ) settings.

Let the dielectric constant and thickness of the dielectric be εd[, and the dielectric constant and thickness of the liquid crystal layer be εLC-i, respectively, and the voltage applied to the liquid crystal layer V +, c is given by the following equation for the applied voltage V. Given, V+, c = (1+) Therefore, according to the present invention <1+, > ta −> t n
Then, [for the same applied voltage ■, each color is 1 (, (,
The applied voltage V0,c (+t
>,\l3,c((-i),vl,C(+3)) do not satisfy the following relationship.

V, , , (R)〈V, , (G) (VLc (IJ) Therefore, the dielectric layer thickness t□, tG-tu is optimally f using the above relationship.
Due to certain limitations, the characteristics shown in FIG. 2 can be made almost equal regardless of the color, as shown by the curve 40 in FIG. 4.

FIG. 5 is a sectional view of a color liquid crystal display panel according to another embodiment of the present invention. In this embodiment, the color filter 50 is formed inside the substrate (liquid crystal layer (11t!l)) and used as a dielectric layer, and by changing the filter thickness of each color, the total dielectric layer thickness is t1.

t, , In is varied. Above the electrode layer 62 (1(
A protective film 61 is provided on the arranged filter 50, and an alignment layer 47 is formed thereon2).

In the above embodiments, the alignment layers 10 and 12 are shown separately from the dielectric layer, but they may also be used together with the dielectric layer by using polyimide or the like.

[Effects of the Invention] As is clear from the following embodiments, in the present invention, dielectric layers with different thicknesses are provided corresponding to each color filter. 126
By making the dielectric layer j9 relatively large (1"), the conventional problem of hQi light dispersion is improved to a large 11". This is extremely effective in improving the quality of color liquid crystal display panels.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional color liquid crystal display panel, Figure 2 is a diagram showing the transmittance versus voltage characteristics of a conventional color liquid crystal display, and Figure 4 is a cross-sectional view of a conventional color liquid crystal display panel. 1, 6...・ Group (anti. 7, 8, 9, 13, 32 Deni 1ff
l. 11 - Liquid crystal layer, 64.50 Color filter, 1-1++, t6, tn --H4'fp, body layer piece. Figure 1 Figure 2 Figure 4

Claims (4)

[Claims] (1) A color liquid crystal display panel consisting of a liquid crystal layer sandwiched between two substrates each having a plurality of electrodes, and a color filter with different selection wavelengths provided corresponding to the electrodes. A color liquid crystal display panel characterized in that a dielectric layer having a different thickness depending on the type of color filter is formed between the liquid crystal layer and at least one electrode j*. (2) The dielectric layer is formed by setting the thickness of a portion corresponding to a color filter with a long selected wavelength to be larger than the thickness of a portion corresponding to a color filter having a short selected wavelength. Color liquid crystal display panel described in 1881. (3) The dielectric IZ has three selected wavelengths corresponding to red, green, and blue.
3. The color liquid crystal display panel according to claim 2, wherein the color liquid crystal display panel is made smaller in size in accordance with different color filters. (4) A color liquid crystal display panel according to claim 1, characterized in that the color filter is formed as a dielectric layer having different thicknesses depending on the type of the electrode.