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Driving method of liquid crystal display, liquid crystal display and liquid crystal television

A liquid crystal display and driving method technology, applied to static indicators, instruments, etc., can solve problems such as waste of light intensity, low light transmittance of liquid crystal panels, and inapplicability, so as to save costs, improve display effects, and reduce overall machine costs Effect

Active Publication Date: 2014-03-26
GUANGDONG HISENSE ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the number of LED light strips is large, a large number of constant current sources are required, which increases the cost of the entire backlight module. The existing solution is often to integrate multiple constant current sources into one IC chip. above, but this solution can only be applied to the case where the current of each string of LEDs is small. When the current of each string of LED lights is large, the temperature rise of the IC exceeds the requirements and cannot be applied
When the cooling device of the constant current source is placed outside the IC, the overall driving cost will be greatly increased
In addition, due to the liquid crystal molecular characteristics of the liquid crystal panel of the liquid crystal display, it takes a certain time to reach the best state after the control voltage is applied. During the deflection process, the light transmittance of the liquid crystal panel is relatively low, but the backlight LED is always on, causing strong waste

Method used

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  • Driving method of liquid crystal display, liquid crystal display and liquid crystal television
  • Driving method of liquid crystal display, liquid crystal display and liquid crystal television
  • Driving method of liquid crystal display, liquid crystal display and liquid crystal television

Examples

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Effect test

no. 1 example

[0045] Such as figure 1As shown, the power supply 1 outputs a constant current source 2, and the constant current source is connected to three LED light bars 4 to form three power supply circuits A, B and C, and a controlled switch is provided on each power supply circuit 31, used to receive the switch control signal output by the controller 3, so that the three light bars are powered in turn and time-sharing in each time period of the same power supply cycle, that is, each connected controlled switch corresponds to one control signal . When in use, the principle of driving a single light bar corresponding to a single constant current source should be followed.

[0046] Such as figure 2 As shown, the power supply waveform diagram of the LED light bar in the three power supply circuits through the first time-sharing power supply mode. According to the needs of the LCD screen, each power supply cycle is divided into three time periods; in each time period, there is only one p...

no. 2 example

[0052] Such as Figure 4-5 As shown, a power supply 1 outputs four constant current sources 2, and each constant current source 2 is connected to three light bars 4 to form a power supply circuit. The first constant current source is connected to three light bars to form A 1 、A 2 A 3 , 3 power supply circuits, the second constant current source connects 3 light bars to form B 1 , B 2 B 3 , 3 power supply circuits, the third constant current source connects 3 light bars to form C 1 、C 2 、C 3 , 3 power supply circuits, the fourth constant current source connects 3 light bars to form D 1 、D 2 D. 3 , 3 power supply circuits. There is a controlled switch 32 on each power supply circuit, which is used to receive the switch signal output by the controller 3, so that the three light bars connected to the same constant current source are divided in the same power supply cycle. Timely power supply, that is, when in use, should follow the principle of a single constant current...

no. 3 example

[0057] Such as Figure 6 As shown, a power supply 1 outputs three constant current sources 2, and each constant current source 2 is connected to different numbers of LED light bars 4, forming 6 power supply circuits in total. The first constant current source provides power for an LED light bar to form a power supply circuit E 1 , the second constant current source is connected to 2 light bars to form 2 power supply circuits F 1 , G 1 , the third constant current source is connected to 3 light bars to form H 1 , I 1 、J 1 , 3 power supply circuits. There is a controlled switch 32 on each power supply circuit, which is used to receive the switch signal output by the controller 3, so that the three light bars connected to the same constant current source are divided in the same power supply cycle. Timely power supply, that is, when in use, should follow the principle of a single constant current source driving the corresponding single light bar, that is, each power supply c...

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Abstract

The invention discloses a driving method of a liquid crystal display, a liquid crystal display and a liquid crystal television, which mainly aims to provide a driving method and a device for reducing the number of constant current sources which drive an LED (light-emitting diode) in the liquid crystal display. The driving method of the liquid crystal display and the liquid crystal television provided by the invention are applied to the liquid crystal television. The liquid crystal television comprises at least a power supply. The power supply outputs at least one constant current source which is connected with light bars. At least one of the constant current sources is connected with at least two light bars to form a plurality of power supply loops. In addition, the liquid crystal display further comprises a time-sharing power supply controller for controlling the light bars to be connected to a same constant current source to be started or closed in a time-sharing way in a power supply period. According to the driving method of the liquid crystal display, the liquid crystal display and the liquid crystal television, the number of driving constant current sources of multipath LED in the liquid crystal television is reduced by time-share opening the LEDs supplied power by one constant current source, and the cost of the liquid crystal display is saved.

Description

technical field [0001] The invention relates to a liquid crystal display driving method, a liquid crystal display, and a liquid crystal television. Background technique [0002] At present, the CCFL backlight source in the backlight module of the liquid crystal display has basically been replaced by the LED backlight source. Due to the strict requirements of LED devices on driving power and manufacturing process problems, there will always be certain differences in the driving voltage of different LED lamps. When LEDDs are used in series, this difference will be superimposed and magnified. The LED light strips of the light source often use a constant voltage source to drive a constant current source, and each light strip is connected to a constant current source that accurately controls the current of each channel for power supply. This power supply method of the LED light strip avoids different lights. Due to the large current difference of the strips under the same voltag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/36G02F1/133
Inventor 庞震华徐爱臣
Owner GUANGDONG HISENSE ELECTRONICS CO LTD