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Display screen backlight control circuit and method and display device

A technology of backlight control and backlight drive circuit, which is applied in the field of display screens, can solve problems such as residual images on LCD screens in display devices, and achieve the effect of eliminating residual images

Active Publication Date: 2014-07-16
SHANGHAI AVIC OPTOELECTRONICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But after the power supply voltage returns to zero at T2, due to the existence of parasitic charges in the backlight drive circuit 101, the backlight source voltage has not returned to zero at T2, and is V1; thus making the backlight source 102 still continue to have a luminous effect for a certain period of time, Causes afterimage phenomenon on the LCD screen in the display device

Method used

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  • Display screen backlight control circuit and method and display device
  • Display screen backlight control circuit and method and display device
  • Display screen backlight control circuit and method and display device

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Embodiment Construction

[0023] The present invention will be described in more detail and complete below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only parts related to the present invention are shown in the drawings but not all content.

[0024] image 3 What is shown is a schematic diagram of a display screen backlight control circuit in Embodiment 1 of the present invention. Such as image 3 As shown in , the display backlight control circuit includes a discharge circuit 202 and a switch circuit 203; image 3 Also shows the backlight driving circuit 201 and the backlight light source 204 at the same time.

[0025] The first terminal of the discharge circuit 202 is used to connect to the output terminal of the backlight driving circuit 20...

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Abstract

The embodiment of the invention relates to the technical field of display screens, in particular to a display screen backlight control circuit and method and a display device. The display screen backlight control circuit comprises a discharging circuit and a switching circuit, wherein the first end of the discharging circuit is used for being connected with the output end of a backlight driving circuit, the second end of the discharging circuit is used for being connected with an earth line, the first end of the switching circuit is used for being connected with the output end of the backlight driving circuit, the second end of the switching circuit is used for being connected with the input end of a backlight source, the third end of the switching circuit is used for being connected with a shutdown control signal line, and the switching circuit conducts connection or disconnection according to signals on a shutdown control signal line. According to the technical scheme, when shutdown occurs, the backlight driving circuit and the backlight source are disconnected through the switching circuit, charges stored in the backlight driving circuit are released through the discharging circuit, and therefore shadow produced by the charges in the backlight driving circuit after shutdown is eliminated.

Description

technical field [0001] The invention relates to the technical field of display screens, in particular to a display screen backlight control circuit, a display screen backlight control method and a display device. Background technique [0002] Display screen, including liquid crystal display (LCD, Liquid Crystal Display) and OLED display (OLED, Organic Light-Emitting Diode), etc. Taking the liquid crystal display as an example, referred to as the liquid crystal screen, the liquid crystal display device is equipped with a corresponding backlight drive circuit, which drives the backlight light source in the liquid crystal display device to emit light, and then uses the luminous effect of the backlight light source to realize the display effect of the liquid crystal screen. [0003] figure 1 Shown is a schematic diagram of the LCD backlight control circuit in the prior art; the LCD backlight control in the prior art includes two parts, a backlight drive circuit 101 and a backli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/34G09G3/36
Inventor 李文静黄正园王徐鹏丁晓源叶松杨旭
Owner SHANGHAI AVIC OPTOELECTRONICS
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