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External compensation pixel circuit and display panel

An external compensation, pixel circuit technology, applied in static indicators, instruments, etc., can solve the problem of inability to perform external compensation, and achieve the effect of ensuring compensation accuracy and improving driving current.

Inactive Publication Date: 2021-08-17
CHANGSHA HKC OPTOELECTRONICS CO LTD +1
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to provide an externally compensated pixel circuit and a display panel, aiming to solve the problem that external compensation cannot be performed at low and medium gray levels

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  • External compensation pixel circuit and display panel

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Embodiment Construction

[0027] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0029] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between the components in a certain posture (as shown in the accompanying drawings). Relative positi...

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Abstract

The invention discloses an external compensation pixel circuit and a display panel. The circuit comprises a signal input module, a light emitting control module, an energy storage capacitor, a light emitting device and a driving current sampling module. The signal input module is connected with the driving current sampling module and the light-emitting device through the energy storage capacitor, the signal input module is connected with a controlled end of the light-emitting control module, the light-emitting control module is further connected with the light-emitting device, and the light-emitting control module is used for adjusting the gray scale of the light-emitting device according to a received pulse width modulation signal; the driving current sampling module is used for collecting the driving current of the light-emitting device, so that the driving chip adjusts the signal voltage through the driving current to carry out external compensation. According to the invention, a certain driving current can be maintained when the light-emitting device displays medium and low gray scales, so that the driving chip can adjust the magnitude of the signal voltage according to the driving current to realize external compensation, and the compensation precision of the external compensation can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of display panels, in particular to an external compensation pixel circuit and a display panel. Background technique [0002] In the existing high-performance display methods, OLED (Organic Light-Emitting Diode, Organic Light-Emitting Diode), as a current-mode light-emitting device, is increasingly used. In the application of OLED, the two main problems of brightness uniformity and afterimage usually need to be solved by corresponding compensation technology. Compensation techniques can be divided into internal compensation and external compensation. Internal compensation refers to a method of compensation within a pixel using a sub-circuit constructed by a TFT (Thin Film Transistor, thin film field effect transistor). External compensation refers to sensing the electrical or optical characteristics of pixels through an external drive circuit or device, and then performing compensation. [0003] Currently...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/3208G09G3/3233
CPCG09G3/3208G09G3/3233G09G2320/0233G09G2320/0257G09G2320/0271
Inventor 邬可荣李源规郑在纹郑浩旋
Owner CHANGSHA HKC OPTOELECTRONICS CO LTD
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