Electro-optical panel driving circuit, electro-optical device provided with electro-optical panel and driving circuit, and electronic apparatus provided with electro-optical device

A panel drive circuit, electro-optic technology, applied in the direction of optics, nonlinear optics, color TV with bandwidth compression, etc., can solve the problem that the dummy circuit cannot correctly reflect the characteristics of the sampling circuit and buffer circuit, high precision, and it is difficult to fully remove the bad delay Impact and other issues

Active Publication Date: 2004-12-01
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, if the above-mentioned technology is adopted, the output of the dummy circuit cannot correctly reflect the characteristics of the sampling circuit and the buffer circuit, and the indirect detection using the delay time of the dummy circuit cannot be said to be highly accurate.
Therefore, there is a technical problem that it is difficult to sufficiently remove the bad influence of the delay by adjusting the timing based on the detection result.
In addition, according to the technique disclosed in Patent Document 1, in order to utilize the internal power supply of the electro-optical panel in the dummy circuit, the dummy circuit is restricted by the internal power supply voltage, and generally there is a technique requiring high withstand voltage performance for ICs constituting the dummy circuit. aspects of the problem

Method used

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  • Electro-optical panel driving circuit, electro-optical device provided with electro-optical panel and driving circuit, and electronic apparatus provided with electro-optical device
  • Electro-optical panel driving circuit, electro-optical device provided with electro-optical panel and driving circuit, and electronic apparatus provided with electro-optical device
  • Electro-optical panel driving circuit, electro-optical device provided with electro-optical panel and driving circuit, and electronic apparatus provided with electro-optical device

Examples

Experimental program
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Effect test

no. 1 Embodiment

[0053] refer to Figure 1 to Figure 5 , to describe the first embodiment of the electro-optical device of the present invention.

[0054] First, refer to figure 1 The overall configuration of the electro-optical device of the present invention will be described. here, figure 1 It is a block diagram showing the overall configuration of the liquid crystal device of this embodiment.

[0055] like figure 1 As shown, the liquid crystal device includes a liquid crystal panel 100 , a timing generator 200 , and an image signal processing circuit 300 as an example of the "electro-optic panel" of the present invention as main parts.

[0056] In the liquid crystal panel 100, the element substrate on which the TFT 116 is formed as a switching element and the counter substrate are opposed to the electrode formation surface, and are pasted together with a certain gap, and the liquid crystal is sandwiched in the gap. The timing generator 200 outputs various timing signals used in each p...

no. 2 Embodiment

[0102] A second embodiment of the electro-optic device of the present invention will be described below.

[0103] Compared with the above-mentioned first embodiment, the second embodiment is different in the size or plane figure of each constituent element of the dummy circuit 27. As for the circuit structure and operation of the dummy circuit 27, the overall structure of the liquid crystal device, and the circuits in the liquid crystal panel 100 The structure and operation are the same as those of the first embodiment. Therefore, the structure different from that of the first embodiment will be described below. In addition, since there is a one-to-one correspondence with all the constituent elements of the above-mentioned first embodiment, drawing illustration is omitted.

[0104] First, as mentioned above, in the sampling circuit 140, since a plurality of sampling switches 141 are connected in parallel, the dummy circuit 27 is also similarly connected in parallel with the s...

no. 3 Embodiment

[0113] refer to Figure 7 A third embodiment of the electro-optical device of the present invention will be described.

[0114] Compared with the above-mentioned first embodiment, the third embodiment is different in the structures of the enabling circuits 170a, 170b, . . . The overall structure and operation of the liquid crystal device are the same as those of the first embodiment. Therefore, only the configurations different from those of the first embodiment will be described.

[0115] In this example, if Figure 7 As shown, the enable circuits 170a, 170b, . That is, the configuration in the first embodiment is further configured by adding inverters 173a, 174a and the like.

[0116] According to this configuration, it is possible to suppress a large signal delay due to wiring capacitance and the like in all paths from the bidirectional shift register 160 to the sampling circuit.

[0117] At this time, even in the dummy circuit 27 which simulates the delay of the detec...

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PUM

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Abstract

An electro-optical panel driving circuit is provided on a substrate and includes a shift register circuit that sequentially outputs transfer signals, a buffer circuit that buffers the sequentially output transfer signals, a sampling circuit that samples image signals using the buffered transfer signals as sampling pulses and that supplies the sampled image signals to data lines, and a dummy circuit that simulates at least part of the buffer circuit and the sampling circuit. Delay signals indicating the amount of delay of the sampling pulses and generated by the dummy circuit are fed back to the shift register circuit so that the amount of delay is reduced. The buffer circuit, the sampling circuit, and the dummy circuit are provided on the substrate.

Description

technical field [0001] The present invention belongs to the technical fields of a driving circuit for driving an electro-optical panel such as a liquid crystal panel, an electro-optical device such as a liquid crystal device equipped with the electro-optical panel and the driving circuit, and an electronic device such as a liquid crystal projector equipped with the electro-optical device. Background technique [0002] Such an electro-optic panel driving device includes, for example, a sampling circuit for supplying a sampled image signal to a data line of the electro-optical panel, a data line driving circuit for supplying a sampling pulse to the sampling circuit, and the like. The data line drive circuit is configured such that the transfer signal output from the shift register is sequentially output to the sampling circuit via the buffer circuit as a sampling pulse. On the other hand, the buffer circuit buffers the transmission signal output from the shift register, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1345G02F1/133G09G3/20G09G3/36G09G5/18H04N11/02
CPCG09G3/3648G09G5/18G09G2300/0408G09G3/3611G09G2310/0297G09G3/3688G09G3/36
Inventor 石井贤哉
Owner SEIKO EPSON CORP
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