Display panel, display device and control method for display panel

Patent metadata

Field	Value
Publication number	US-2021193034-A1
Application number	US-201816081489-A
Country	US
Kind code	A1
Filing date	Feb 9, 2018
Priority date	Jun 30, 2017
Publication date	Jun 24, 2021
Grant date	—

Abstract

A display panel, a display device and a control method for a display panel are provided. The display panel comprises a plurality of pixel circuits, each of which includes a driving transistor, an energy storage unit, a data writing unit, a reset unit, a compensation unit, and a light emitting unit. The display panel further comprises a driving circuit, which is used to control the compensation unit during a compensation period so as to disconnect the other terminal of the energy storage unit from one terminal of the light emitting unit, so that the light emitting unit in each of the pixel circuits is in an extinguished state.

First claim

1 - 12 . (canceled)

13 . A method for controlling a display panel, where the display panel comprises:
a plurality of pixel circuits, each of the plurality of pixel circuits includes a driving transistor, an energy storage unit, a data writing unit, a reset unit, a compensation unit and a light emitting unit, a first terminal of the driving transistor being used for receiving a power supply voltage, a control terminal of the driving transistor being connected to a first terminal of the energy storage unit and the data writing unit, respectively, a second terminal of the driving transistor being connected to a second terminal of the energy storage unit, the reset unit and a first terminal of the compensation unit, respectively, a second terminal of the compensation unit being connected to a first terminal of the light emitting unit, a second terminal of the light emitting unit being grounded, and control terminals of compensation units in the pixel circuits being connected together, and wherein the display panel is controlled by: controlling the compensation unit during a compensation period to disconnect the second terminal of the energy storage unit from the first terminal of the light emitting unit so that the light emitting unit in each of the pixel circuits is in an extinguished state.

14 . The method for controlling a display panel according to claim 13 , wherein the compensation unit comprises a first transistor, a first terminal of the first transistor being connected to the first terminal of the compensation unit, a second terminal of the first transistor being connected to the second terminal of the compensation unit, and a control terminal of the first transistor being connected to a control terminal of the compensation unit.

15 . The control method for a display panel according to claim 13 , wherein the data writing unit comprises a second transistor, a first terminal of the second transistor being connected to the control terminal of the driving transistor, and a second terminal of the second transistor being connected to a data line; and
wherein the reset unit comprises a third transistor, a first terminal of the third transistor being connected to the second terminal of the driving transistor, and a second terminal of the third transistor being connected to a reset line.

16 . The method for controlling a display panel according to claim 15 , further comprising: controlling the compensation unit during a light emitting period to connect the second terminal of the energy storage unit to the first terminal of the light emitting unit, and controlling the data writing unit and the reset unit so as to control light emission of the light emitting unit.

17 . The method for controlling a display panel according to claim 16 , wherein
controlling the data writing unit and the reset unit so as to control light emission of the light emitting unit comprises: firstly outputting a first control signal to the control terminal of the second transistor to bring the second transistor into a turn-on state, and outputting a second control signal to the control terminal of the third transistor to bring the third transistor into a turn-off state, so that a data signal of the data line is written to the first terminal of the energy storage unit, the first transistor is turned on, and the light emitting unit is in a light emitting state, and further outputting a third control signal to the control terminal of the third transistor to bring the third transistor into a turn-on state, and outputting a fourth control signal to the control terminal of the second transistor to bring the second transistor into a turn-off state, so that the second terminal of the energy storage unit is reset to a low level signal, and the light emitting unit is in an extinguished state.

18 . A display panel comprising:
a plurality of pixel circuits, each of the plurality of pixel circuits includes a driving transistor, an energy storage unit, a data writing unit, a reset unit, a compensation unit, and a light emitting unit, a first terminal of the driving transistor being used for receiving a power supply voltage, a control terminal of the driving transistor being connected to a first terminal of the energy storage unit and the data writing unit, respectively, a second terminal of the driving transistor being connected to a second terminal of the energy storage unit, the reset unit and a first terminal of the compensation unit, respectively, a second terminal of the compensation unit being connected to a first terminal of the light emitting unit, and a second terminal of the light emitting unit being grounded; and a driving circuit, the driving circuit being connected to a control terminal of the compensation unit, the data writing unit and the reset unit in each of the pixel circuits, respectively, and control terminals of compensation units in the pixel circuits being connected together, the driving circuit being at least used to control the compensation unit during a compensation period so as to disconnect the second terminal of the energy storage unit from the first terminal of the light emitting unit, so that the light emitting unit in each of the pixel circuits is in an extinguished state.

19 . The display panel according to claim 18 , wherein the compensation unit comprises a first transistor, a first terminal of the first transistor being connected to the first terminal of the compensation unit, a second terminal of the first transistor being connected to the second terminal of the compensation unit, and a control terminal of the first transistor being connected to the control terminal of the compensation unit.

20 . The display panel according to claim 18 , wherein the data writing unit comprises a second transistor, a first terminal of the second transistor being connected to the control terminal of the driving transistor, a second terminal of the second transistor being connected to a data line, and a control terminal of the second transistor being connected to the driving circuit.

21 . The display panel according to claim 20 , wherein the reset unit comprises a third transistor, a first terminal of the third transistor being connected to the second terminal of the driving transistor, a second terminal of the third transistor being connected to a reset line, and a control terminal of the third transistor being connected to the driving circuit.

22 . The display panel according to claim 21 , wherein the driving circuit is further used to control the compensation unit during a light emitting period so as to connect the second terminal of the energy storage unit to the first terminal of the light emitting unit, and to control the data writing unit and the reset unit so as to control light emission of the light emitting unit.

23 . The display panel according to claim 22 , wherein when the driving circuit controls the data writing unit and the reset unit so as to control light emission of the light emitting unit,
the driving circuit firstly outputs a first control signal to the control terminal of the second transistor to bring the second transistor into a turn-on state, and outputs a second control signal to the control terminal of the third transistor to bring the third transistor into a turn-off state, so that a data signal of the data line is written to one of the first terminal and the second terminal of the energy storage unit, the first transistor is turned on, and the light emitting unit is in a light emitting state; the driving circuit then outputs a third control signal to the control terminal of the third transistor to bring the third transistor into a turn-on state, and outputs a fourth control signal

Assignees

• Boe Technology Group Co Ltd

Inventors

• Li Yongqian

Classifications

• G09G3/3233 Primary

  with pixel circuitry controlling the current through the light-emitting element · CPC title

• G09G2320/0223

  Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes · CPC title

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title

• G09G2300/0814

  used for selection purposes, e.g. logical AND for partial update · CPC title

• G09G2330/02

  Details of power systems and of start or stop of display operation · CPC title