US 12,469,470 B2
Display device and panel drive circuit thereof, and method for charge bleed-off
Jinfeng Chen, Beijing (CN); Nani Liu, Beijing (CN); Yifeng Su, Beijing (CN); Xiaoli Kong, Beijing (CN); Qibiao Lin, Beijing (CN); Qiaoni Wang, Beijing (CN); and Zhe Huang, Beijing (CN)
Assigned to Fuzhou BOE Optoelectronics Technology Co., Ltd., Fujian (CN); and Beijing BOE Technology Development Co., Ltd., Beijing (CN)
Appl. No. 18/702,291
Filed by Fuzhou BOE Optoelectronics Technology Co., Ltd., Fujian (CN); and BOE Technology Group Co., Ltd., Beijing (CN)
PCT Filed May 6, 2023, PCT No. PCT/CN2023/092492
§ 371(c)(1), (2) Date Apr. 17, 2024,
PCT Pub. No. WO2023/221789, PCT Pub. Date Nov. 23, 2023.
Claims priority of application No. 202210527893.X (CN), filed on May 16, 2022.
Prior Publication US 2024/0412705 A1, Dec. 12, 2024
Int. Cl. G09G 3/36 (2006.01); G09G 3/20 (2006.01)
CPC G09G 3/3648 (2013.01) [G09G 3/2096 (2013.01); G09G 3/3614 (2013.01); G09G 2310/0289 (2013.01); G09G 2310/08 (2013.01); G09G 2320/0247 (2013.01); G09G 2320/0257 (2013.01); G09G 2330/027 (2013.01); G09G 2360/145 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A panel drive circuit applicable to a display device, the display device comprising: a display panel and a plurality of pixels on the display panel, the pixels comprising transistors, wherein the panel drive circuit comprises:
a panel control circuit and a display drive circuit, wherein the panel control circuit is coupled to a power supply terminal and the display drive circuit, respectively, and the display drive circuit is further configured to be coupled to the plurality of pixels, wherein
the panel control circuit is configured to: transmit, in a case that the display panel is detected to be turned on, a first display drive signal to the display drive circuit based on a power supply signal of a first potential provided by the power supply terminal; and transmit, in a case that the display panel is detected to be turned off, at least one target signal of following signals sequentially to the display drive circuit before a potential of the power supply signal drops from the first potential to less than a potential threshold: a second display drive signal and a charge bleed-of signal; and
the display drive circuit is configured to: drive the plurality of pixels to emit light based on the first display drive signal such that the display panel displays a plurality of frames of a first picture; drive the plurality of pixels to emit light based on the second display drive signal such that the display panel displays at least one frame of a second picture; and control the transistors in the plurality of pixels to be turned on based on the charge bleed-off signal to bleed off charges in the plurality of pixels, wherein the second picture is different from the first picture, and the second picture is a monochrome picture; wherein
the display device further comprises: a backlight disposed at a side of the display panel;
the panel control circuit is further configured to detect a light emission state of the backlight and determine a work state of the display panel based on the light emission state of the backlight, wherein the backlight being in a light-emitting state indicates that the display panel is in a turn-on state, the backlight being in a non-light-emitting state indicates that the display panel is in a turn-off state, and in a case that the display panel is turned off, the backlight switches from the light-emitting state to the non-light-emitting state before the potential of the power supply signal starts to drop; and the panel control circuit is further configured to transmit the target signal to the display drive circuit in a case that the display panel is determined to be turned off based on the light emission state of the backlight;
the panel control circuit comprises: a light emission detection sub-circuit, a timing controller, a level shifter, and a switching sub-circuit;
the light emission detection sub-circuit is disposed at a side of the backlight and is coupled to a pull-down power terminal and an input interface of the timing controller, respectively, and the light emission detection sub-circuit is configured to control a connection between the pull-down power terminal and the input interface of the timing controller to be switched on in a case that the backlight is detected to be light-emitting, and control the connection between the pull-down power terminal and the input interface of the timing controller to be switched off in a case that the backlight is detected to be non-light-emitting;
the input interface of the timing controller is further coupled to the power supply terminal, an output interface of the timing controller is coupled to a control terminal of the switching sub-circuit, and the timing controller is configured to transmit a turn-on signal to the control terminal of the switching sub-circuit based on a pull-down power signal transmitted from the pull-down power terminal to the input interface, and transmit a turn-off signal to the control terminal of the switching sub-circuit based on the power supply signal transmitted from the power supply terminal to the input interface;
an input terminal of the switching sub-circuit is coupled to the power supply terminal, an output terminal of the switching sub-circuit is coupled to the pull-down power terminal and the level shifter, respectively, and the switching sub-circuit is configured to control a connection between the power supply terminal and the level shifter to be switched on in response to the turn-on signal, and control the connection between the power supply terminal and the level shifter to be switched off in response to the turn-off signal; and
the level shifter is further coupled to the display drive circuit, and the level shifter is configured to transmit the target signal to the display drive circuit based on the pull-down power signal transmitted from the pull-down power terminal, and transmit the first display drive signal to the display drive circuit based on the power supply signal transmitted from the power supply terminal.