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Electro-optical device and electronic apparatus provided with the same

A technology of electro-optical devices and power circuits, applied in optics, nonlinear optics, instruments, etc., can solve problems such as battery falling off, discharge transistors not being able to conduct, and not being able to discharge

Inactive Publication Date: 2009-07-01
EPSON IMAGING DEVICES CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in this case, if the battery of a mobile phone or the like falls off, unexpected power supply stops, etc., and the control signal from the IC is not output, the above-mentioned discharge transistor cannot be turned on and discharge cannot be performed.

Method used

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  • Electro-optical device and electronic apparatus provided with the same
  • Electro-optical device and electronic apparatus provided with the same
  • Electro-optical device and electronic apparatus provided with the same

Examples

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Embodiment Construction

[0032] Hereinafter, embodiments of the present invention will be described based on the drawings.

[0033] figure 1 , is a block diagram showing the configuration of the electro-optical device 10 in the first embodiment.

[0034] As shown in this figure, the electro-optical device 10 has a liquid crystal panel 100, and on the TFT substrate of the liquid crystal panel 100, a data line driving circuit 110, a scanning line driving circuit 120, and a display area are formed, and a plurality of pixels ( exist figure 1 Only 4 pixels are represented in ) are arranged in a matrix. The data line driving circuit 110 is a shift register that sequentially shifts the horizontal start signal based on the horizontal transfer clock CKH, and supplies RGB image signals to the respective data lines DL in accordance with its output. The scanning line driving circuit 120 is a shift register that sequentially shifts a vertical start signal based on a vertical transfer clock CKV, and supplies a g...

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PUM

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Abstract

The invention, relating to an electro-optical device and an electronic device provided with the same, provides an electro-optical device which is able to discharge a power supply electric potential without using an external control signal, and an electronic device provided with the same, characterized in that a power supply circuit 130 is provided with a positive power supply generating circuit (130A) that generates a positive power supply potential and a negative power supply generating circuit (130B) that generates a negative power supply potential in the electro-optical device (10) having a power supply circuit (130) which generates a power supply potential for controlling on / off of the pixel switching elements (pixel transistors GT) so as to connect discharging resistances (131 and 132) having a resistance value, through which current is run even under a steady state without influencing the whole degree of a module, between each output node of the positive power supply generating circuit (130A) and the negative power supply generating circuit (130B) and the grounding potential.

Description

technical field [0001] The present invention relates to an electro-optical device including a power supply circuit for generating a power supply potential for controlling on and off of a pixel transistor, and an electronic device including the electro-optical device. Background technique [0002] Currently, in an active matrix liquid crystal display device manufactured through a low-temperature polysilicon TFT (Thin Film Transistor, thin-film transistor) process, in order to reduce the cost of the driving signal IC, on the TFT substrate of the liquid crystal panel, a circuit for A power supply circuit of a power supply potential for controlling on and off of pixel TFTs (for example, refer to Patent Document 1). [0003] [Patent Document 1] JP-A-2004-146082 Gazette [0004] However, in a liquid crystal display, when a power supply circuit is formed in the panel, since the power supply potential (for gate-off) to the power supply line of the pixel TFT is not discharged (disch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36
CPCG09G2320/0257G09G2330/021G09G2300/0417G09G3/3677G09G3/3655G09G3/3614G09G3/36G09G3/20G02F1/133
Inventor 堀端浩行
Owner EPSON IMAGING DEVICES CORP