JPS63228129A - Liquid crystal display element - Google Patents

Abstract

PURPOSE:To reduce cost by constituting a titled element in such a manner that the area of at least >=1 picture elements among 3 picture elements constituted of 3 colors; red, green and blue is changed. CONSTITUTION:The light passed color filters and liquid crystal layer is mixed in colors by the quantity of light passed the respective picture elements of red, green and blue (R, G, and B) and expresses one color when the element is viewed. The quantity of the light passing the respective picture elements R, G, B at this time is determined by the transmittance per unit area X picture element area. The color balance of the liquid crystal display element which makes color display can, therefore, be corrected with the three picture elements constituted of the three colors; R, G and B as one set without correcting a driving circuit simply by changing the area of the liquid crystal picture elements corresponding to the color filters of the three colors; R, G and B in such a manner that the constant quantity of light is attained with the same driving voltage. The prepn. of the inexpensive liquid crystal display element having high quality is thereby permitted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a full-color liquid crystal display device using color filters.

[Conventional technology]

In recent years, LCD televisions and display monitors that use full-color LCD displays have come into use.

However, the conventional ones had poor color balance and looked a little strange compared to the actual colors.

Therefore, conventionally, by changing the ratio of R%G and B signals or changing the liquid crystal drive voltage for R%G%B,
Color balance was corrected.

[Problem that the invention seeks to solve]

However, with these methods, individual adjustments or
There was a problem that the circuit became complicated and the cost was extremely high.

The purpose of the present invention is to eliminate individual adjustments and to avoid complicating the circuit configuration, by using a uniform method with high mass production efficiency.
The present invention corrects the color balance and provides a low-cost color liquid crystal display element.

[Means for solving problems]

In the present invention, the difference in voltage-transmittance characteristics (hereinafter referred to as V-T characteristics) is determined by the transmission wavelength of the liquid crystal.
Correction is performed by changing the area of each pixel of B.

When performing full color display on the liquid crystal, the V-T of the liquid crystal
A desired color is displayed by changing the driving voltage between the ON region and OFF region of the characteristic.

At this time, if the same driving voltage is applied to each of the R, G, and B pixels, a black-and-white display with different brightness between white and black will be obtained.

However, since the transmittances of R, G, and B are different, R (red) appears strongly, resulting in a reddish display. Therefore, in the present invention, the area of each pixel is changed so that it is inversely proportional to the R, G, and B V-T characteristics, and the R, G, and B V-T characteristics are matched isometrically. This is for making corrections.

[Effect]

When viewed with the naked eye, the light that has passed through the color filter and liquid crystal layer is mixed depending on the amount of light that has passed through each R, G, and B pixel to express one color. At that time, the scene that passes through each R, G, and B pixel is the transmittance per unit area x pixel area
...Determined by (1).

Therefore, the color balance is corrected by changing the R%G and B pixel areas so that the equation (1) is constant at the same driving voltage.

〔Example〕

Next, embodiments of the present invention will be described in detail based on the drawings.

FIG. 3 is a VT characteristic diagram of a general liquid crystal.

A is the VT characteristic of the red filter, B is the green filter, and C is the blue filter.

Transmittance T1s of red filter A at driving voltage v1
Similarly, the transmittance of the green filter B is T2, and the transmittance of the blue filter is T. Comparing each of the filters A, B, and C, the transmittance is red filter A>green filter B>blue filter〇, and the transmittance T to the red filter is high.

FIG. 2 shows a pattern diagram of a conventional liquid crystal panel. A,
,A, is a pattern row of the liquid crystal panel with red filter A attached in Fig. 3, similarly, B1 and B2 are pattern rows of the liquid crystal panel with green filter B attached, and C, ,C, is the pattern row of the liquid crystal panel with blue filter C attached. This is a pattern row of a liquid crystal panel. The part surrounded by the common side patterns XI, X2, and Xs (A, X+), (BIX...
is the area of each pixel of the liquid crystal. Pixel area (At
Xl), (B1Xr piece...) are all the same size, and when examining the amount of transmitted light of each liquid crystal pixel, when the drive voltage is V, (A+-X+) T+)>(B"x, ) X
(Tz)>(C5-X+)X(Ta), and the liquid crystal pixel with red filter A (AtX, )
, (A4 X5), (AI Xx)...
The amount of light passing through the liquid crystal pixels (B, -Xl), (CtXt), (B2X) with green filter B or blue filter 〇
I), (C2-Xl)...... It can be seen that there are many.

FIG. 1 shows a pattern diagram of a liquid crystal panel according to the present invention.

Similarly to FIG. 2, A1' and A2' are pattern rows of liquid crystal panels with red filter A attached, B11, B, / are pattern rows of liquid crystal panel with green filter B attached, C8',
C2' is a pattern row of a liquid crystal panel equipped with a blue filter C. Xl, X, , Xs are common side patterns. The liquid crystal pixel area is (A) with red filter A.
+X+), (AxXI)・・・・・・・・・
・ (BIXI), (B2) with green filter B
-X2)......, the ratio of (C+X+) with blue filter C, (C2X2.)....... is 0.8: 0.9: 1.0 It was set to Experimental results show that the amount of transmitted light for each liquid crystal pixel is almost the same. This can be done by simply changing the area of the liquid crystal pixel corresponding to the three color filters of R, G%B, and without any correction of the drive circuit. This makes it possible to correct the color balance of a liquid crystal display element that displays colors using a set of two pixels.

In this example, the ratio of each pixel of R, G%B is set to 0.
．． 8:0.9:1.0, but it is possible to set appropriate values depending on the characteristics of each filter.

〔Effect of the invention〕

As described above, according to the present invention, color balance can be corrected by changing the design of a panel mask, and a stable liquid crystal display element with high quality can be manufactured. Moreover, by eliminating voltage adjustment circuits and adjustment efforts, it becomes possible to supply low-cost LCD televisions and video monitors.

[Brief explanation of drawings]

FIG. 1 is a pattern diagram of a liquid crystal panel showing an embodiment of the present invention, FIG. 2 is a pattern diagram of a conventional liquid crystal panel, and FIG. 3 is a VT characteristic diagram of a general liquid crystal color panel. A, , A, , A,', A2' ・・・・・・
Pattern row with red filter i, B, , B, , B,', B11 ... Pattern row with green filter, cl, C2, CI', C, / ... - Pattern row with blue filter. Figure 3 Figure 2 Figure 1

Claims (1)

[Claims] The upper and lower electrodes are arranged in a matrix, and each grid composed of the electrodes arranged in the matrix is divided into red, green, and blue (R, G,
, B), and correspond to the three color filters of R, G
In a liquid crystal display element that performs color display using a set of three pixels composed of three color filters of , B,
A liquid crystal display device characterized in that the area of at least one pixel among the three pixels composed of the three colors R, G, and B is changed.