JPS58156995A - Color liquid crystal display - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a color liquid crystal display device, and particularly aims at reducing the capacity of a shift register on the signal electrode drive side and increasing the switching speed when switching signals.

The 11th diagram shows the cross-sectional structure of a color liquid crystal display element (1) that displays a color image that has already been proposed, (2) is a front glass substrate, (3) is a rear glass substrate, R, G, 13°R.
%G, B, . . . are red, green, and back striped color polarizing elements formed on the inner surface of the front glass substrate (2), respectively;
(4) is a transparent insulating film such as acrylic resin, I is a scanning film deposited on the insulating film (4) in a direction perpendicular to the extending direction of polarizing elements R%e, B... The electrode Y is a signal electrode formed on the inner surface of the rear glass substrate (3) facing the polarizing elements R, G, B, . . . . The scanning electrode X and the signal electrode Y are made of tin oxide 8n02, indium oxide In2O
It is formed of a transparent conductive film such as 5" (51+81 is
The alignment film is formed by covering the scanning electrodes X and signal electrodes Y, and can be formed by applying an organic resin such as polyimide to a spinner cloth. These alignment films 15)+6) are 90. It is rubbed in the opposite direction to give it an alignment property that orients the liquid crystal molecules in a certain direction. (7)
is a nematic liquid crystal with positive dielectric anisotropy filled between the alignment films (5) and 61, and has a molecular structure rotated by 90＠ due to the regulating force of the alignment films (5) and (6), which is a twisted nematic structure. It is said that (8) is the color polarizing element R, G disposed outside the rear glass substrate (2).
, B..., a polarizing plate with a polarization plane perpendicular to (9)
is a white light source. In the figure, the electric field applied chain acid is shown as ON, and the non-applied area is shown as OFF.

In the ON@ region, the light emitted from the white light source 19) passes through the polarizing plate (
8), the light becomes linearly polarized light, travels straight through the liquid crystal (7), and enters the color polarizing element R%G%B/old...K. However, the polarization planes of these color polarizing elements R, G, B... are perpendicular to the polarization plane of the linearly polarized light that arrives, so the colored light of each element, ie red, green, blue... ... is emitted and appears on the display side, and the three primary colors of red, edge, growth, old, and so on are combined to display any mixed color. On the other hand, in the 01PF region, the linearly polarized light transmitted through the polarizing plate (8) is rotated by 90" in the liquid crystal (7) and reaches the color polarizing element R%01B...K. In this case, the rotated Polarization plane of linearly polarized light and color polarizing element R1G.

Since the plane of polarization coincides with that of B..., the linearly polarized light is transmitted therethrough and appears as a white background on the display side.

FIG. 2 shows the structure of the scanning electrodes X, signal electrodes Y, and color polarizing elements RGB... in the above example, and
consists of three electrodes; for example, the signal electrode Y1 consists of electrodes 71t, 7B, and 7ti. These electrodes 71t
712711 is a color polarizing element RG! 1 corresponds to each. In the illustrated example, the scanning electrodes are XH (120 H electrodes) and the signal electrodes are YM (Ms * 16a%, the actual total number is 480 electrodes, which is three times the number). This is the number required when performing the test.

FIG. 3 shows a drive block diagram of the above configuration, where uG is 1
A 20-bit shift register sequentially applies scanning signals to scanning electrodes x1 to 120 of the liquid crystal display element (1) via a summer driver (11). Via the driver α-, signal electrodes Y1 to Y140K are provided. ttS inputs the three primary color signals RGB, and outputs a serial signal, that is, RGBRG.
A signal switching circuit II is an A/D conversion circuit that converts this serial signal into a digital signal, and the serial signal is converted to a signal that is sequentially outputted from the A/D conversion circuit 11e.
is input to shift register q3 via.

Oη is the signal switching circuit (1!9, Mu/D conversion circuit 111
1 Shift register IJ This is a subsidiary circuit that controls the latch circuit α1 and shift register IG. The operation of such a configuration is shown in FIG. 4(a). Hs is the horizontal synchronization signal, R%G% is each R, G%B in the shift register α
There are actually three signals with the waveform shown here, corresponding to each primary color. That is, corresponding to RK, 160
Bit, 160 bits for GK, 16 bits for BK
．． 0 pits are simultaneously stored in the shift register 03, and are applied to the signal electrode Y after being once stored in the latch circuit 03. X1X, . . . are scanning signals, and the signals X,
The scanning electrode x1 of the first row receives the signal X! The second row scanning electrode x2 is scanned.

With this kind of structure, shift registers (12 to 48
A device with a capacity of 0 bits is required, which has drawbacks such as an increase in the size of the drive circuit and an increase in the number of output lines. This causes problems such as an increase in the power consumption of the component C-MO8 and a delay in the switching operation.

The present invention was made in consideration of such circumstances, and
Examples will be described in detail below. FIG. 5 shows scanning electrodes XM (
M wm 1~4o) and IJ signal electrode YM (M wm
1 to 160, 480 in total), and is a so-called triple matrix electrode structure. That is, for example, the - signal electrode Y11 is made up of three electrodes 711712715, and forms a 3 wA pixel a1tL21s indicated by diagonal lines at the intersection with the scanning electrode x1. RGBR()B...
is a color polarizing element disposed parallel to and aligned with the scanning electrodes IN... at a position K corresponding to the pixel JK.
The R color polarizing element is also located at the position KG corresponding to pixel 12.
A color polarizing element is further provided, and a B color polarizing element is provided at a position corresponding to the pixel ILIK, and the drive duty is improved to 1/40 compared to 1/120 in the above example.

FIG. 6 shows a driving circuit diagram of a color liquid crystal display element (1) having such an electrode structure and a color polarizing element structure.
Reference numeral 111 denotes a shift register and an X driver on the scanning electrode side, and has the same configuration as that shown in FIG. 3.

1i is a shift register having a capacity of 160 bits, a control circuit and a MU/D conversion circuit having substantially the same configuration as the one described above. - is a signal conversion circuit which receives the three primary color signals RGB, selects only the - primary color signal and transfers it to the mu ρ conversion circuit αe, and when the same primary color signal becomes 160 bits, selects the next primary color signal. The ρ conversion circuit operates to output to the Ifi side. That is, as shown in the figure, for example, a shift register (to)
When 160 bits of the R primary color signal are stored, these signals are given as display signals to the divided electrodes ytt, 721.1st, . . . of the latch signal electrodes Y, Y, .

FIG. 4(b) shows such operating waveforms, where R%G and B are shift registers (2) each consisting of a 160-bit signal.
The output signal corresponds to the three primary colors. Scanning signal x1
During the output period, the signals R, G%B are applied to the signal electrode Y each C times.
1 to Y140, and the first scanning electrode x1 of lk is displayed. After that, the second, third, etc. scanning electrode x
2. The display moves to xl Tsukasa.

With such a configuration, the capacity of the shift register (2) can be reduced to 160 bits, and the operating frequency of the signal conversion circuit Gs can be lowered by about 15KH11K.

At such an operating frequency, there is no risk of delay in the C-MOS(7)X switching operation, and power consumption can be suppressed to a sufficiently low value.

As described above, according to the color liquid crystal display device of the present invention, it is possible to use a shift register having a capacity equal to the total number of signal electrodes, so that the device can be miniaturized and the circuit configuration can be simplified. Furthermore, since the operating frequency of the signal switching circuit can be lowered to within the normal operating frequency of the C-MOS, which is a component thereof, it is possible to increase the signal switching speed and reduce power consumption.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a color liquid crystal display element, FIG. 2 is a plan view showing the electrode configuration and the configuration of a color polarizing element according to a conventional example, FIG. 3 is a same-side block circuit diagram, and FIG. )teeth,
Ipsilateral operation waveform diagram, FIG. 4 (b) is a waveform diagram of the embodiment of the present invention,
FIG. 5 is a plan view showing the electrode structure and the structure of the color polarizing element according to the same embodiment, and FIG. 6 is a block circuit diagram of the same side. (1)...Color liquid crystal display element, signal α2ai...shift register, (11)...X driver, αS- latch circuit, 1-...Y driver, (1sσi...signal switching circuit , 111 Qe...mu/D conversion circuit, [I
Hη...control circuit. ? + + + + 4 Figure 2

Claims (1)

[Claims] 1. M scanning electrodes; M signal electrodes each of which is divided into three parts and forming three pixels at the intersection with the scanning electrode; and M scanning electrodes arranged parallel to the scanning electrode; three primary color polarizing elements of red, back, and green formed corresponding to pixels at the same position among the pixels of the signal electrode; liquid crystal filled in the gap between the scanning electrode and the signal electrode; The signal electrode drive circuit includes a scanning electrode drive circuit that sequentially drives the signal electrodes, and a signal electrode drive circuit that drives the signal electrodes, and the signal electrode drive circuit transfers M-bit shift registers and negative primary color signals of the three primary color signals to the shift registers. A color liquid crystal display device including a switching circuit for sending signals, and in which signals for each color and K are applied to signal electrodes.