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.
CN113270071AInactive Publication Date: 2021-08-17CHANGSHA HKC OPTOELECTRONICS CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHANGSHA HKC OPTOELECTRONICS CO LTD
Publication Date
2021-08-17
Estimated Expiration
Not applicable · inactive patent

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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.
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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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