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LCD and its drive circuit

A liquid crystal display and drive circuit technology, applied in static indicators, instruments, etc., can solve the problems of circuit area expansion, large area, etc., and achieve the effect of reducing size

Inactive Publication Date: 2006-11-01
RENESAS ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, flexible substrate wiring for supplying signals and power to the data line driving circuit also requires a large area.
[0006] The second problem is that the circuit area is enlarged, because the switch bank used to select the gray voltage is composed of high voltage devices

Method used

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  • LCD and its drive circuit
  • LCD and its drive circuit
  • LCD and its drive circuit

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0031] figure 1 is a block diagram of the liquid crystal display 100 of this embodiment. The liquid crystal display 100 of this embodiment includes a plurality of scanning lines 4 , a plurality of data lines 3 , and a pixel 5 arranged at each intersection of the plurality of scanning lines 4 and the plurality of data lines 3 . The liquid crystal display 100 further includes a plurality of pixel groups composed of pixels 5 , and the pixels are arranged at each intersection of a plurality of adjacent data lines 3 and a plurality of scanning lines 4 . Using the time-division driving method of sequentially outputting signals, signals of the same polarity are output to all data lines included in each pixel group of a plurality of pixel groups, and signals of opposite polarity are output to a plurality of pixel groups adjacent to each other. The sex-inverted signal is output to the data lines included in the pixel group.

[0032] That is to say, if figure 1 As shown in , a plural...

no. 2 example

[0082] In the first embodiment, the polarity switching circuit 70 is formed on the driver IC 1, and the time division selection circuit 8 is formed on the panel. Also, a selection circuit having a polarity switching function as well as a time-division switching function can be formed on the panel. Figure 12 is a detailed diagram of the D / A conversion circuit portion and the precharge circuit portion of the driver IC 1 according to the present embodiment.

[0083] In the first embodiment, the polarity switching circuit 70 is provided between the precharge circuit 60 and the output terminal Xn. However, in this embodiment, the precharge circuit 60 is directly connected to the output terminal Xn. like Figure 13 As shown, the time-division selection circuit 8 is composed of two switches for each data line 3 . Each switch is connected to an odd-numbered output terminal and an even-numbered output terminal, and includes a polarity switching function. Therefore, the number of s...

no. 3 example

[0096] In the second embodiment, a selection circuit having a polarity switching function and a time-division switching function is formed on the panel. A charge recovery circuit may be formed on the panel.

[0097] Figure 15 is a block diagram of the liquid crystal display 200 of the present invention. A charge recovery circuit 9 is further formed on the liquid crystal panel substrate 2 . The charge recovery circuit 9 is controlled by the signal output from the signal processing circuit 11 . Refer below Figure 16 The charge recovery circuit 9 will be described in detail. In the charge recovery circuit 9, two charge recovery switches 91 and 92 are provided in parallel to the data lines 3, and the other ends of the charge recovery switches 91 and 92 are connected to the bus lines 95 or 96 next to each data line group. Bus lines 95 and 96 are connected to charge recovery capacitors 93 and 94, respectively. During the first precharge period of the horizontal period, the c...

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PUM

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Abstract

A liquid crystal display of this invention includes a plurality of scan lines, a plurality of data lines, and pixels provided at each intersection of the plurality of scan lines and the plurality of data lines. The liquid crystal display further includes a plurality of pixel groups constituted of the pixels provided at each intersection of the consecutive plurality of data lines and one of the plurality of scan lines, in which signals of the same polarity are outputted to all data lines included in each of the plurality of pixel groups by a time-sharing drive that sequentially outputs signals, and reversed polarity signals are outputted to the plurality of pixel groups adjacent to each other, so that signals with polarities inverted after each frame are outputted to the data lines included in the pixel groups.

Description

technical field [0001] The invention relates to a liquid crystal display and its drive circuit, which is suitable for setting a data line drive circuit with a D / A conversion circuit only on the panel side of the dot inversion drive. Background technique [0002] In a well-known liquid crystal display, a plurality of voltages (hereinafter referred to as pixel voltages) applied to pixels from data lines through TFTs are inverted after every predetermined period. This means that the pixels are driven in an AC manner. The polarity here refers to the positive or negative polarity of the pixel voltage with respect to the voltage of the liquid crystal common electrode (com voltage) as a reference. Such a driving method is used to prevent degradation of the liquid crystal material. [0003] As such a driving method, there are known a dot inversion driving method and a 2H dot inversion method. In the dot inversion driving method, polarities of pixel voltages on adjacent data lines...

Claims

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Application Information

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IPC IPC(8): G09G3/36G02F1/133G09G3/20
Inventor 桥本义春
Owner RENESAS ELECTRONICS CORP
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