A driving method of a liquid crystal display panel, a liquid crystal display panel and a display device

Patent metadata

Field	Value
Publication number	US-2016293123-A1
Application number	US-201414408561-A
Country	US
Kind code	A1
Filing date	Jun 9, 2014
Priority date	Dec 26, 2013
Publication date	Oct 6, 2016
Grant date	—

Abstract

This invention provides a liquid crystal display panel, a source driver in the liquid crystal display panel comprises an amplifier whose amplification coefficient is adjustable, the amplifier can adjust a received data signal based on a currently selected amplificaiton coefficient, and output the adjusted data signal to a data line that is currently signally-connected with the amplifier, moreover, the currently selected amplification coefficient is inversely proportional to a rate at which the data line charges a current signally-connected sub-pixel unit. For the case that the rate at which the data line charges the sub-pixel unit is relatively low, a relative large amplification coefficient can be selected, thereby nonuniform brightness of the display image caused by a low charging rate of the sub-pixel unit can be avoided; for the case that the rate at which the data line charges the sub-pixel unit is relatively high, a relatively small amplifcation coefficient is selected, thereby unnecessary power consumption can be saved. This invention further provides a display device comprising such a liquid crystal display panel and a driving method for use in such a liquid crystal display panel.

First claim

1 . A liquid crystal display panel comprising an array substrate, data lines located on the array substrate, sub-pixel units signally-connected with the data lines, and a source driver signally-connected with each of the data lines, wherein:
the source driver comprises an amplifier whose amplification coefficient is adjustable, the amplifier being used for adjusting a received data signal based on a currently selected amplification coefficient, and outputting the adjusted data signal to a data line that is currently signally-connected with the amplifier, wherein the currently selected amplification coefficient is inversely proportional to a rate at which the data line charges a current signally-connected sub-pixel unit.

2 . The liquid crystal display panel as claimed in claim 1 , wherein the amplifier comprises a plurality of positive signal amplifiers and a plurality of negative signal amplifiers, the source driver further comprises:
a first adjustment unit adjusting amplification coefficient of the positive signal amplifier; and a second adjustment unit adjusting amplification coefficient of the negative signal amplifier, the first adjustment unit is connected between a negative phase signal input end of the positive signal amplifier and an output end of the positive signal amplifier in series, and the second adjustment unit is connected between a positive phase signal input end of the negative signal amplifier and an output end of the negative signal amplifier in series.

3 . The liquid crystal display panel as claimed in claim 2 , wherein the first adjustment unit and the second adjustment unit comprise resistances whose resistance values are adjustable.

4 . The liquid crystal display panel as claimed in claim 2 , wherein the source driver further comprises an output polarity control unit,
wherein an odd numbered data line and an even numbered data line are taken as a group of data lines, the group of data lines are connected with a positive signal amplifier and a negative signal amplifier respectively through the output polarity control unit, at a first moment, the output polarity control unit turns on the positive signal amplifier and the odd numbered data line, the output polarity control unit turns on the negative signal amplifier and the even numbered data line, and at a second moment, the output polarity control unit turns on the positive signal amplifier and the even numbered data line, the output polarity control unit turns on the negative signal amplifier and the odd numbered data line.

5 . The liquid crystal display panel as claimed in claim 4 , wherein the source driver further comprises:
first digital to analog conversion units in one-to-one correspondence with the plurality of positive signal amplifiers; and second digital to analog conversion units in one-to-one correspondence with the plurality of negative signal amplifiers, the first digital to analog conversion unit being used for performing digital to analog converstion to a received positive gamma voltage, and outputting the digital to analog converted positive gamma voltage to a positive phase signal input end of a corresponding positive signal amplifier; the second digital to analog conversion unit being used for performing digital to analog converstion to a received negative gamma voltage, and outputting the digital to analog converted negative gamma voltage to a negative phase signal input end of a corresponding negative signal amplifier.

6 . The liquid crystal display panel as claimed in claim 1 , wherein a data line is signally-connected with a corresponding column of sub-pixel units,
the even numbered data line is signally-connected with the source driver through a first wiring, the odd numbered data line is signally-connected with the source driver through a second wiring, wherein, the first wiring and the second wiring are arranged in different layers on the array substrate.

7 . The liquid crystal display panel as claimed in claim 1 , wherein,
two adjacent columns of sub-pixel units are taken as a group of sub-pixel unit columns, each group of sub-pixel columns share a data line located between the two columns of sub-pixel units, and there are two gate lines between sub-pixel units of adjacent rows.

8 . A display device comprising a liquid crystal display panel, the liquid crystal display panel comprising an array substrate, data lines located on the array substrate, sub-pixel units signally-connected with the data lines, and a source driver signally-connected with each of the data lines, wherein:
the source driver comprises an amplifier whose amplification coefficient is adjustable, the amplifier being used for adjusting a received data signal based on a currently selected amplification coefficient, and outputting the adjusted data signal to a data line that is currently signally-connected with the amplifier, wherein the currently selected amplification coefficient is inversely proportional to a rate at which the data line charges a current signally-connected sub-pixel unit.

9 . A driving method of a liquid crystal display panel, comprising:
selecting a current amplification coefficient of an amplifier signally-connected with a data line in the source driver based on a rate at which the data line charges a current signally-connected sub-pixel unit, the currently selected amplification coefficient being inversely proportional to the rate at which the data line charges a current signally-connected sub-pixel unit; the amplifier adjusting a received data signal based on the currently selected amplification coefficient, and outputting the adjusted data signal to a data line that is currently signally-connected with the amplifier.

10 . The display device as claimed in claim 8 , wherein the amplifier comprises a plurality of positive signal amplifiers and a plurality of negative signal amplifiers, the source driver further comprises:
a first adjustment unit adjusting amplification coefficient of the positive signal amplifier; and a second adjustment unit adjusting amplification coefficient of the negative signal amplifier, the first adjustment unit is connected between a negative phase signal input end of the positive signal amplifier and an output end of the positive signal amplifier in series, and the second adjustment unit is connected between a positive phase signal input end of the negative signal amplifier and an output end of the negative signal amplifier in series.

11 . The display device as claimed in claim 10 , wherein the first adjustment unit and the second adjustment unit comprise resistances whose resistance values are adjustable.

12 . The display device as claimed in claim 10 , wherein the source driver further comprises an output polarity control unit,
wherein an odd numbered data line and an even numbered data line are taken as a group of data lines, the group of data lines are connected with a positive signal amplifier and a negative signal amplifier respectively through the output polarity control unit, at a first moment, the output polarity control unit turns on the positive signal amplifier and the odd numbered data line, the output polarity control unit turns on the negative signal amplifier and the even numbered data line, and at a second moment, the output polarity control unit turns on the positive signal amplifier and the even numbered data line, the output polarity control unit turns on the negative signal amplifier and the odd numbered data line.

13 . The display device as claimed in claim 10 , wherein the source driver further comprises:
first digital to analog conversion units in one-to-one correspondence with the p

Assignees

• Boe Technology Group Co Ltd
• Hefei Boe Optoelectronics Tech

Inventors

• Feng Xia
• Huang Jiacheng
• Wang Donghui

Classifications

• G09G3/3614 Primary

  Control of polarity reversal in general · CPC title

• G09G2310/027

  Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters · CPC title

• G09G2310/0291

  Details of output amplifiers or buffers arranged for use in a driving circuit · CPC title

• G09G3/3677

  suitable for active matrices only · CPC title

• G09G2330/021

  Power management, e.g. power saving · CPC title