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Compensation circuit applied to liquid crystal display panel and display device

A liquid crystal display panel and compensation circuit technology, applied to static indicators, instruments, etc., can solve problems such as over-brightness or over-darkness, screen flickering, over-deflection, etc., to prevent charge polarization, suppress screen flickering, and avoid abnormal The effect of symmetrical deflection

Active Publication Date: 2014-10-22
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the power is turned on again, power will be reapplied to the pixel electrode and the common electrode. Since the applied voltage is symmetrical, the polarized liquid crystal will be asymmetrically deflected under the action of the symmetrical voltage at this time, resulting in under-deflection or over-deflection. As a result, when the display panel switches between the previous frame image and the next frame, the image brightness will be too bright or too dark compared with the normal display brightness, causing the screen to flicker

Method used

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  • Compensation circuit applied to liquid crystal display panel and display device
  • Compensation circuit applied to liquid crystal display panel and display device
  • Compensation circuit applied to liquid crystal display panel and display device

Examples

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Embodiment 1

[0031] This embodiment provides a compensation circuit applied to a liquid crystal display panel, including a power supply module 10 and a compensation module 20. The specific circuit schematic diagram is as follows figure 2 shown. The power supply module 10 includes a rectifier 11, a capacitor 12 and a relay. The input end of the rectifier 11 is connected to the power supply, the output end of the rectifier 11 is connected to the first end of the capacitor 12 and the first end of the relay, and the second end of the capacitor 12 is grounded. The rectifier 11 is used to convert the power supply from alternating current to direct current, the capacitor 12 is used to store and release charges, and the relay controls its contacts to provide working voltage to the compensation circuit 20 according to whether the power supply is turned on.

[0032] Optionally, the rectifier 11 is a full-bridge rectifier, which connects the alternating current to the full-bridge rectifier. The full...

Embodiment 2

[0039] This embodiment also provides a compensation circuit applied to a liquid crystal display panel, and its specific circuit schematic diagram is as follows image 3 As shown, the power supply module 10 also includes a rectifier 11, a capacitor 12 and a relay, and the circuit structure and working principle are the same as those in the first embodiment, and are not repeated here.

[0040] The difference from the first embodiment is that the compensation module 20 in this embodiment includes a Zener diode 25, a filter capacitor 26 and a transistor 27, wherein the Zener diode 25 and the filter capacitor 26 are connected in parallel, and the Zener diode 25 and the filter capacitor 26 are connected in parallel. One end is connected to the output end of the power module 10 and the gate of the transistor 27, the other end of the Zener diode 25 and the filter capacitor 26 is grounded, the first end of the transistor 27 is grounded, and the second end outputs the compensated common ...

Embodiment 3

[0045] In order to solve the above technical problems, the present invention also provides a display device, which not only includes a display panel 30 on which common electrode lines are arranged, but also includes the compensation applied to the liquid crystal display panel in Embodiment 1 or Embodiment 2. circuit, the schematic diagrams of the display device are as follows Figure 5 , Image 6 As shown, the compensation module applied to the liquid crystal display panel provides a compensated common voltage to the common electrode lines on the display panel 30 .

[0046] Since the input module 22, the amplifying module 23 and the output module 24 can form a loop with the display panel 30, the common voltage can be compensated, that is, the input module 22 receives the common voltage fed back by the display panel 30 and transmits it to the amplifying module 23 (ie, Amplifier) ​​for amplification, and then sent back to the display panel 30 by the output module 24 . If there...

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PUM

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Abstract

The invention discloses a compensation circuit applied to a liquid crystal display panel and a display device. The compensation circuit applied to the liquid crystal display panel comprises a power module and a compensation module, wherein the power module is used for providing a working voltage to the compensation module continuously when a power supply source is put through and cut off; the compensation module compensates a common voltage based on the working voltage. By adding the power module, charges stored in a capacitor are utilized for discharging after shutdown so as to provide the working voltage to the compensation module, so that the common voltage can be compensated, the problem that the charge discharging speed becomes slow after the shutdown is solved, therefore, the discharging speed of the charge can be speeded up after the applied voltage disappears, the liquid crystal is prevented from being polarized by the residual charges, asymmetric deviation of the liquid crystal is avoided after booting again, and effective control on the screen flicker phenomenon is realized.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a compensation circuit and a display device applied to a liquid crystal display panel. Background technique [0002] The display device includes a lower glass substrate, an upper glass substrate and liquid crystal between the upper and lower glass substrates, wherein the upper glass substrate is provided with a color filter and a common electrode, and the lower glass substrate is provided with a thin film transistor and a pixel electrode. Each thin film transistor corresponds to a pixel point, and the liquid crystal molecules are controlled by the electric field between the pixel electrode and the common electrode. An upper polarizer and a lower polarizer are respectively arranged above the upper glass substrate and below the lower glass substrate. When light passes through the lower polarizer, polarized light is formed, and the polarized light passes through the liquid ...

Claims

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Application Information

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IPC IPC(8): G09G3/36
Inventor 宋嘉嘉张春兵
Owner BOE TECH GRP CO LTD
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