Electric power circuit, display driver and voltage supply method
A technology of power supply circuit and voltage supply, applied in static indicators, instruments, adjusting electrical variables, etc., can solve the problems of increasing on-resistance R loss of MOS transistors and increasing the scale of switching circuits, so as to reduce the image quality. The effect of lowering, high-speed setting, and lower power consumption
Inactive Publication Date: 2005-02-09
SEIKO EPSON CORP
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Problems solved by technology
In this case, the resistance R can be reduced by increasing the channel width W of the MOS transistor, but the scale of the switching circuit will become larger
And, the loss of the on-resistance R of the MOS transistor will also increase
Method used
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[0055] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the embodiment described below does not unduly limit the content of the present invention described in the claims. Furthermore, not all components described below are necessarily essential components of the present invention.
[0056] 1. Liquid crystal display device
[0057] figure 1 An outline of the composition of the active matrix type liquid crystal display device including the power supply circuit according to the present embodiment is given.
[0058] The liquid crystal display device 10 includes a liquid crystal display panel (in a broad sense, a display panel) 20 .
[0059] The liquid crystal display panel 20 is, for example, formed on a glass substrate. The glass substrate is configured with: scanning lines (gate lines) GL1-GLM (M is an integer greater than or equal to 2), a plurality of scanning lines are arranged in the Y direction, a...
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A power supply circuit. When the voltage is to be supplied to a counter electrode opposing a pixel electrode via an electro-optic substance by switching from a first voltage VCOML in the lower potential side to a first voltage VCOMH in the high potential side, a second voltage VCOMH1 in the high potential side at a higher potential than the first voltage VCOMH is first supplied to the counter electrode instead of the first voltage VCOML in the lower potential side, and then the first voltage VCOMH in the high potential side is supplied. Or, prior to supplying the second voltage VCOMH1 in the high potential side to the counter electrode, either the first voltage VCOMH in the high potential side or a first intermediate voltage VCOMH2 at a lower potential than the first voltage VCOMH in the high potential side but at a higher potential than the first voltage VCOML in the lower potential side may be supplied to the counter electrode.
Description
technical field [0001] The invention relates to a power supply circuit, a display driver and a voltage supply method. Background technique [0002] An active matrix type liquid crystal display device includes a plurality of scanning lines and a plurality of data lines formed in a matrix shape. Moreover, it also includes: a plurality of switching elements, wherein each switching element is connected to each scanning line and each data line; a plurality of pixel electrodes, wherein each pixel electrode is connected to each switching element. The pixel electrode is opposed to the counter electrode through a liquid crystal (electro-optical substance in a broad sense). [0003] In the liquid crystal display device having such a structure, the voltage supplied from the data line is applied to the pixel electrode through the switching element turned on by the selected scanning line. And, the transmittance of the pixel varies according to the voltage applied between the pixel elec...
Claims
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Login to View More IPC IPC(8): G02F1/133G05F1/40G09G3/20G09G3/36
CPCG09G3/3655G09G3/3696
Inventor 森田晶
Owner SEIKO EPSON CORP