Gray-scale voltage conversion method and module, data driving circuit and display panel

A technology of grayscale voltage and conversion method, which is applied to static indicators, instruments, etc., can solve problems such as difficulty in grayscale selection, increased output delay, and reduced accuracy of grayscale voltage, so as to improve selection accuracy and reduce Time-consuming, reduce the effect of selection error

Active Publication Date: 2015-11-25
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, high-definition and ultra-high-definition displays are booming. In order to drive several K pixels, the number of driving data bits increases and the number of gray-scale voltages increases. The traditional method of using a single digital-to-analog conversion circuit to select gray-scale voltages may face challenges. If the fan-in coefficient is too large, the output delay will increase; in addition, as the gray scale increases, the difference between adjacent gray scale voltages will become larger and larger without increasing power consumption, that is, without increasing the gamma voltage range. Small, which brings difficulties and errors to the current gray scale selection, leading to problems such as reduced accuracy of gray scale voltage selection

Method used

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  • Gray-scale voltage conversion method and module, data driving circuit and display panel
  • Gray-scale voltage conversion method and module, data driving circuit and display panel
  • Gray-scale voltage conversion method and module, data driving circuit and display panel

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Experimental program
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Effect test

Embodiment 1

[0071] This embodiment provides a gray-scale voltage conversion method and a corresponding gray-scale voltage conversion module, which can improve the selection accuracy of the gray-scale voltage and reduce the selection delay time.

[0072] refer to figure 2 , the grayscale voltage conversion method specifically includes steps:

[0073] Step S1) Split the pixel data into high byte group data and low byte group data according to the number of bits of the pixel data.

[0074] In this step, according to the number of bits of the pixel data, the data splitting unit 1 splits the pixel data into high byte group data and low byte group data. For the processing of eight-bit digital data, the lower four-bit low-order data can be obtained by ANDing the pixel data with 00001111 (binary), and the upper four-bit upper-order data can be obtained by ANDing the pixel data with 11110000 (binary). Thus, the pixel data is split into high byte data and low byte data.

[0075] Step S2) The lo...

Embodiment 2

[0100] This embodiment provides a gray-scale voltage conversion method and a corresponding gray-scale voltage conversion module, which can improve the selection accuracy of the gray-scale voltage and reduce the selection delay. The difference from Embodiment 1 is that in this embodiment, the analog data converted from digital data is first subjected to gamma-grayscale selection, and then synthesized into overall display data.

[0101] refer to image 3 , in this embodiment, the grayscale voltage conversion method specifically includes steps:

[0102] Step S1) Split the pixel data into high byte group data and low byte group data according to the number of bits of the pixel data.

[0103] In this step, according to the number of bits of the pixel data, the data splitting unit 1 splits the pixel data into high byte group data and low byte group data. For the processing of eight-bit digital data, the lower four-bit low-order data can be obtained by ANDing the pixel data with 00...

Embodiment 3

[0131] A data driving circuit, including the grayscale voltage conversion module in Embodiment 1 or Embodiment 2.

[0132] The data driving circuit adopts a grayscale voltage conversion method and its module with a small delay time, so it has a better driving effect. It is especially suitable for the grayscale voltage generation and selection method in the data driving circuit, so as to improve the ability to drive pixel electrodes and realize multi-pixel display.

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Abstract

The invention belongs to the technical field of display, and specifically relates to a gray-scale voltage conversion method and module, a data driving circuit and a display panel. The gray-scale voltage conversion method is used for converting pixel data into display data including gray-scale information corresponding to the pixel data, wherein the pixel data is digital, and the display data is analog; splitting the pixel data into high byte data and low byte data; performing digital-analog conversion on the low byte data and the high byte data; and synthesizing the low byte data and the high byte data after the digital-analog conversion. The gray-scale voltage conversion method and module can reduce the selection delay time and improve the selection accuracy of the gray-scale voltage.

Description

technical field [0001] The invention belongs to the field of display technology, and in particular relates to a gray scale voltage conversion method and its module, a data driving circuit and a display panel. Background technique [0002] In the data driving circuit of the display panel, the function of the data driving circuit is to provide a signal to the data line after the TFT switch is turned on, so as to charge the pixel electrode to the corresponding gray scale voltage. Since the gray-scale voltage for driving the pixel electrode is an analog voltage, the data driving circuit includes a digital part of the functional circuit and an analog part of the functional circuit. The main function of the analog function circuit is to select one of the analog gray-scale voltages to drive the corresponding pixel electrodes. [0003] In the prior art, the digital-to-analog converter selection circuit includes a digital-to-analog conversion circuit (Digital Analog Converter, DAC f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/20
Inventor 王建军戴珂尹傛俊
Owner BOE TECH GRP CO LTD
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