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Source driver

A technology of source driver and buffer

Inactive Publication Date: 2011-03-30
NOVATEK MICROELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The data register stores a digital data signal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0013] Please refer to Figure 2A and Figure 2B , which is a schematic diagram of the source driver according to the first embodiment of the present invention. The source driver 110 includes a data register (1) 112, a level shifter (1) 114 (level shifter), a gamma correction unit (1) 115, a digital-to-analog converter (1) 116 and a buffer (buffer)(1)118. The source driver 120 includes a data register (2) 122, a level shifter (2) 124, a gamma correction unit (2) 125, a digital-to-analog converter (2) 126 and a buffer (2) 128 .

[0014] At Figure 2A Among them, the source drivers 110 and 120 use the polarity inversion method of line inversion to drive the liquid crystal molecules. Wherein, the level shifter (1) 114, the gamma correction unit (1) 115, the digital-to-analog converter (1) 116 and the buffer (1) 118 of the source driver 110 can be integrated in the source driver 110 It is set to receive the first group of reference voltages GND (0V) ~ AVDD (6V) before leavin...

no. 2 example

[0023] Please refer to Figure 3A and Figure 3B, which is a schematic diagram of a source driver according to a second embodiment of the present invention. The source driver 210 includes a data register (1) 212, a level shifter (1) 214, a gamma correction unit (1) 215, a buffer (1) 216 and a digital-to-analog converter (1) 218 . The source driver 220 includes a data register (2) 222, a level shifter (2) 224, a gamma correction unit (2) 225, a buffer (2) 226 and a digital-to-analog converter (2) 228 .

[0024] At Figure 3A Among them, the source drivers 210 and 220 use the polarity inversion method of line inversion to drive the liquid crystal molecules. Wherein, the level shifter (1) 214, the gamma correction unit (1) 215, the buffer (1) 216 and the digital-to-analog converter (1) 218 ​​of the source driver 210 can be integrated in the source driver 210 It is set to receive the first group of reference voltages GND (0V) ~ AVDD (6V) before leaving the factory. In addit...

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Abstract

The invention discloses a source driver, comprises a data register, an electric level transfer device, a gamma correction unit, a digital analogue converter and a buffer. The digital register stores a digital data signal; the electric level transfer device is used for lifting the electric level of the digital data signal; the gamma correction unit provides a gamma curve; the digital analogue converter is used for converting the digital data signal subjected to electric level lifting into an analog data signal by reference to the gamma curve; and the buffer outputs the analog data signal to drive a corresponding data line, wherein the electric level transfer device, the gamma correction unit, the digital analogue converter and the buffer are set to be capable of receiving a first group of reference voltage or a second group of reference voltage.

Description

technical field [0001] The present invention relates to a source driver, and in particular to a source driver capable of reducing costs. Background technique [0002] Since the liquid crystal molecules cannot be fixed at a constant voltage, otherwise the liquid crystal molecules will no longer be able to rotate in response to the change of the electric field due to the destruction of the characteristics, so as to form different gray scales. Therefore, when driving the liquid crystal molecules, it is necessary to change the voltage at intervals to provide voltages of positive and negative polarities, so as to achieve the purpose of polarity inversion. The source driver of a general liquid crystal display has a variety of polarity inversion methods to drive liquid crystal molecules, such as dot inversion driving for better display quality, or power consumption saving. Line inversion (line inversion) drive, etc. [0003] If the polarity inversion is line inversion, since the ...

Claims

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Application Information

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IPC IPC(8): G09G3/36G09G3/20
Inventor 黄立群谢晋昇
Owner NOVATEK MICROELECTRONICS CORP
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