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Pixel circuit, pixel driving method, and display device

A technology of pixel circuit and driving current, which is applied in the direction of static indicators, instruments, etc., can solve the problems of large driver chip area, low contrast of display panel, long gamma adjustment time, etc., and achieve the effect of avoiding false light emission

Inactive Publication Date: 2017-08-11
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to generate different data voltages, many sets of Gamma data are required, the amount of data processing is large, the area occupied by the driver chip is large, and the Gamma adjustment time when the display panel is shipped is also very long
[0003] In addition, in the existing pixel driving circuit, in the non-light-emitting phase, there will be a leakage current flowing through the light-emitting device, and the light-emitting device will emit weak light, that is, there is still a certain brightness when the display panel is in a black state, resulting in display Panel has low contrast

Method used

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

Examples

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Comparison scheme
Effect test

Embodiment 1

[0052] figure 1 A schematic circuit structure diagram of a pixel circuit provided in Embodiment 1 of the present invention, as shown in figure 1 As shown, the pixel circuit includes: a driving transistor DTFT, a capacitor C, a data writing module 1, a current control module 2 and a light emitting device OLED. The data writing module 1 is connected to the first end of the capacitor C, the second end of the capacitor C is connected to the control electrode of the driving transistor DTFT, the first electrode of the driving transistor DTFT is connected to the first power supply end, and the second electrode of the driving transistor DTFT It is connected with the first pole of the light emitting device OLED, the current control module 2 is connected with the first pole of the light emitting device OLED and the second power supply terminal, and the second pole of the light emitting device OLED is connected with the second power supply terminal.

[0053] The data writing module 1 is...

Embodiment 2

[0074] figure 2 A schematic circuit structure diagram of a pixel circuit provided in Embodiment 2 of the present invention, as shown in figure 2 As shown, the pixel circuit is an embodiment of the pixel circuit provided in the first embodiment above. Wherein, optionally, the reset module 3 includes: a first transistor T1 and a second transistor T2, the control pole of the first transistor T1 is connected to the reset control signal input line Reset, and the first pole of the first transistor T1 is connected to the third power terminal connected, the second pole of the first transistor T1 is connected to the second end of the capacitor C, the control pole of the second transistor T2 is connected to the reset control signal input line Reset, and the first pole of the second transistor T2 is connected to the fourth power supply terminal, The second pole of the second transistor T2 is connected to the first terminal of the capacitor C.

[0075] Optionally, the threshold compen...

Embodiment 3

[0108] Figure 4 A flow chart of a pixel driving method provided by Embodiment 3 of the present invention, such as Figure 4 As shown, the pixel driving method is based on the pixel circuit, and the pixel circuit adopts the pixel circuit in the above-mentioned embodiment 1 or embodiment 2. The specific circuit structure can refer to the description in the above-mentioned embodiment 1 and embodiment 2, and will not be repeated here. . The pixel driving method includes:

[0109] Step S1 , in the data writing phase, the data writing module writes the data voltage provided by the data line into the first end of the capacitor under the control of the first control signal input from the first control signal input line.

[0110] Step S2, in the light-emitting stage, the driving transistor generates a driving current under the control of the voltage at the second terminal of the capacitor; the current control module controls the driving current to flow into the current under the con...

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Abstract

The invention discloses a pixel circuit, a pixel driving method, and a display device. The pixel circuit comprises a driving transistor, a capacitor, a data writing module, and a current control module. In a luminous phase process, under control of a second control signal input by a second control signal input line, the current control module is used to control a ratio between total time of a driving current flowing to the current control module and the total time of the driving current flowing to a luminous device, and then the visual brightness of the luminous device is controlled. By adopting a technical scheme provided by the invention, when data voltage input by a data line is not changed, the current control module is used to adjust the ratio between the total time of the driving current flowing to the current control module and the total time of the driving current flowing to the luminous device, and therefore the adjustment of the visual brightness of the luminous device is realized. A number of Gamma data in a driving chip is effectively reduced, and the data processing speed of the driving chip is accelerated.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a pixel circuit, a pixel driving method and a display device. Background technique [0002] In existing pixel driving circuits, the driving transistor generates a corresponding driving current to drive the display device to emit light by inputting a data voltage to the driving transistor. In order to generate different data voltages, many sets of Gamma data are required, the amount of data processing is large, the area occupied by the driver chip is large, and the Gamma adjustment time when the display panel is shipped is also very long. [0003] In addition, in the existing pixel driving circuit, in the non-light-emitting phase, there will be a leakage current flowing through the light-emitting device, and the light-emitting device will emit weak light, that is, there is still a certain brightness when the display panel is in a black state, resulting in display The panel has l...

Claims

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Application Information

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IPC IPC(8): G09G3/3208
CPCG09G3/3208G09G3/2018G09G3/3233G09G2300/0819G09G2300/0842G09G2300/0861G09G2320/0238G09G2320/064G09G2300/0426G09G2320/0233G09G2320/0252G09G2330/028
Inventor 玄明花杨盛际王磊肖丽付杰陈小川卢鹏程
Owner BOE TECH GRP CO LTD
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