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Compensation circuit and display device applied to liquid crystal display panel

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

Active Publication Date: 2016-06-01
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 and display device applied to liquid crystal display panel
  • Compensation circuit and display device applied to liquid crystal display panel
  • Compensation circuit and display device applied to liquid crystal display panel

Examples

Experimental program
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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, and its specific circuit schematic diagram is as follows figure 2 shown. Wherein the power 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 or not.

[0032] Optionally, the rectifier 11 is a full-bridge rectifier, and the alternating current is connected to the full-bridge recti...

Embodiment 2

[0039] This embodiment also provides a compensation circuit applied to a liquid crystal display panel, and its specific circuit schematic diagram is shown in image 3 As shown, the power module 10 also includes a rectifier 11, a capacitor 12, and a relay. The circuit structure and working principle are the same as those in Embodiment 1, and will not be repeated here.

[0040] The difference from Embodiment 1 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 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 are grounded, the first end of the transistor 27 is grounded, and the second end outputs the compensated common voltage.

[0041] Zener diode 25 is also a crysta...

Embodiment 3

[0045] In order to solve the above-mentioned technical problems, the present invention also provides a display device, which includes a display panel 30 provided with common electrode lines, and the compensation applied to the liquid crystal display panel in Embodiment 1 or Embodiment 2. circuit, the schematic diagram of the display device is as Figure 5 , Figure 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 processing, and then sent back to the display panel 30 by the output module 24 . If there is no working volta...

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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 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 color filters and common electrodes, and the lower glass substrate is provided with thin film transistors and pixel electrodes. 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 crystal mole...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/36
Inventor 宋嘉嘉张春兵
Owner BOE TECH GRP CO LTD