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Pixel driving circuit, driving method thereof, and display device

A pixel driving circuit, driving transistor technology, applied in circuits, electrical components, static indicators, etc., can solve problems such as inconsistency, uneven brightness of OLED display screens, and small size

Active Publication Date: 2019-01-18
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the size of the ordinary OLED display is not very large, the length of the power supply in the power supply circuit and the power supply wire of each pixel is not very long, that is, the resistance of the power supply wire is very small. Therefore, during the work of the OLED display, The resistance voltage drop (IR drop) of the power supply wire is very small, the voltage of each pixel point is basically the same, and each pixel point emits light with the same brightness, so there is no problem of uneven brightness of the OLED display; but with the OLED display The size gradually increases, which makes the length of the power supply in the power supply circuit and the power supply wire of each pixel increase, that is, the resistance of the power supply wire increases, resulting in the resistance voltage drop (IR drop) of the power supply wire during the operation of the OLED display. ) increases, which makes the voltages of the pixels in different regions of the OLED display inconsistent, and the pixels in different regions emit light with different brightness, which leads to uneven brightness of the screen during the working process of the OLED display

Method used

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  • Pixel driving circuit, driving method thereof, and display device
  • Pixel driving circuit, driving method thereof, and display device
  • Pixel driving circuit, driving method thereof, and display device

Examples

Experimental program
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Embodiment 1

[0042] see figure 1 The pixel drive circuit provided in this embodiment includes a jump capacitor C, a reset unit 1, a data writing unit 2, a compensation unit 3, a light emission control unit 4, and a driving transistor DTFT for driving the light emitting unit 5 to emit light;

[0043] The output end of the reset unit 1 is connected to the first plate of the jump capacitor C, the output end of the data writing unit 2 is connected to the second plate of the jump capacitor C, and the output end of the compensation unit 3 is connected to the second plate of the jump capacitor C. The second plate is connected;

[0044] The first plate of the jump capacitor C is connected to the control terminal of the drive transistor DTFT, the output terminal of the reset unit 1 is also connected to the input terminal of the drive transistor DTFT, and the output terminal of the compensation unit 3 is also connected to the output terminal of the drive transistor DTFT and the output terminal of th...

Embodiment 2

[0085] This embodiment also provides a driving method for a pixel driving circuit, which is applied to the pixel driving circuit in Embodiment 1; the driving method includes multiple driving cycles, and each driving cycle includes:

[0086] The first stage T 1 , the reset unit 1 clears the terminal voltage of the first plate of the jump capacitor C in the third stage of the last drive cycle, and controls the drive transistor DTFT to be turned on; the data writing unit 2 writes the data signal into the jump capacitor C second plate;

[0087] The second stage T 2 , the compensation unit 3 discharges the first plate of the jump capacitor C when the drive transistor DTFT is turned on until the drive transistor DTFT is turned off;

[0088] The third stage T 3 , the light emission control unit 4 reduces the output terminal voltage of the driving transistor DTFT, so that the driving transistor DTFT is turned on, and the light emitting unit 5 emits light; the compensation unit 3 tr...

Embodiment 3

[0103] This embodiment also provides a display device, which includes the pixel driving circuit as described in Embodiment 1. The display device can well avoid the problem of resistance voltage drop caused by too long power supply wires, so that the data signal The normal output ensures uniform brightness of the display screen.

[0104] It should be noted that the display device provided in the above embodiments may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, or a navigator.

[0105] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in an appropriate manner.

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PUM

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Abstract

The invention discloses a pixel driving circuit, its driving method, and a display device, relates to the field of display technology, and aims to solve the problem of uneven screen brightness during the working process of an organic light-emitting display. The pixel driving circuit includes a jump capacitor, a reset unit, a data writing unit, a compensation unit, a light emission control unit, and a driving transistor for driving the light emitting unit to emit light; wherein, the reset unit turns on the driving transistor, and the compensation unit is used to control the driving transistor. The threshold voltage and the IR Drop of the negative pole of the power supply are compensated. The pixel driving circuit provided by the invention is used in a display device.

Description

technical field [0001] The present invention relates to the technical field of organic light-emitting display, in particular to a pixel driving circuit, a driving method thereof, and a display device. Background technique [0002] Organic light-emitting diode (Organic Light-Emitting Diode, hereinafter referred to as OLED) display has many advantages such as self-illumination, fast response, high contrast, wide viewing angle, etc. OLED has been more and more widely used in display devices. [0003] Since the size of the ordinary OLED display is not very large, the length of the power supply in the power supply circuit and the power supply wire of each pixel is not very long, that is, the resistance of the power supply wire is very small. Therefore, during the work of the OLED display, The resistance voltage drop (IR drop) of the power supply wire is very small, the voltage of each pixel point is basically the same, and each pixel point emits light with the same brightness, so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/3208
CPCG09G3/3208G09G2300/0819G09G2300/0842G09G2300/0861G09G2310/08G09G2320/0223G09G3/3258G09G3/3233G09G2320/0233H10K59/131G09G3/3266G09G2300/0426G09G2310/0278G09G3/3291
Inventor 董甜
Owner BOE TECH GRP CO LTD
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