Driving apparatus for driving an LCD monitor

Abstract

The present invention provides a driving device for driving a flat panel display apparatus. The driving device comprises a first driving unit, which includes a first output buffer, and a first switch coupled between an output terminal of the first driving unit and an output terminal of the first output buffer; a second driving unit, which includes a second output buffer, and a second switch coupled between an output terminal of the second driving unit and an output terminal of the second output buffer; and a third switch, coupled between an output terminal of the second driving unit and an output terminal of the third output buffer, wherein the third switch can selectively conduct so as to alow the output voltage of the first output buffer and the output voltage of the second output buffer to be an average voltage.

Description

[0001] This application is a divisional application of an application titled "A Method for Driving a Liquid Crystal Display Screen and Related Devices" (application number: 03122005.3; filing date: April 21, 2003). technical field [0002] The invention relates to a driving device for driving a flat display device, in particular to a driving device which can drive pixels in the same row on a liquid crystal panel (LCD panel) to correspond to the same voltage level to display a uniform (uniform) gray level (gray level). device. Background technique [0003] Generally speaking, the advantages of liquid crystal display screens include light weight, low power consumption, and low radiation, etc. Therefore, liquid crystal display screens have been widely used in various portable (protable) information products on the market, such as notebook computers ( Notebook) and personal digital assistant (personal digital assistant, PDA) and other commodities. In addition, liquid crystal di...

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Problems solved by technology

However, each operational amplifier 44, 45, 46, 47, 48, 49 has a different output voltage offset (offset), so it will affect its actual output voltage, that is, when the operational amplifier 44, 45, 46, 47, 48, and 49 all use the same input voltage V1, and finally the voltage difference between the capacitors 50, 51, 52, 53, 54, and 55 will be different.

In addition, it can be seen from the display driving data 36 that the pixels corresponding to the data transmission lines DL3, DL4, DL5, DL6, DL7, and DL8 should display the same gray scale. Differently affected by the offset of its output voltage, that is, each pixel will present an uneven grayscale distribution on the display screen, resulting in poor display quality of the liquid crystal display device 10

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