External compensation detection circuit, driving circuit, display device and driving method
A detection circuit and external compensation technology, applied to static indicators, instruments, etc., can solve the problems of inaccurate random k detection, output signal amplitude reduction, etc., and achieve the effect of improving life, taste and accuracy
Active Publication Date: 2021-11-09
SHENZHEN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD
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Problems solved by technology
However, in the existing k-value detection module, the threshold voltage of the transistor is prone to positive bias. During the RA test, with the positive bias of the threshold voltage, the amplitude of the output signal decreases, which eventually leads to inaccurate random k detection.
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[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Apparently, the described embodiments are only some of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of this application.
[0035] Organic Light Emitting Display (OLED) display panel has self-illumination, low driving voltage, high luminous efficiency, short response time, high definition and contrast, wide viewing angle, wide operating temperature range, flexible display and large area With many advantages such as full-color display, it is recognized by the industry as a display device with the most potential for development. According to the driving method, OLED can be divided into two categories: ...
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The embodiment of the invention provides an external compensation detection circuit, a driving circuit, a display device and a driving method. The external compensation detection circuit comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a seventh transistor, an eighth transistor, a first capacitor, a first node, a second node, a third node and a fourth node. A first pole plate of the first capacitor is electrically connected with the second node, and a second pole plate is electrically connected with the third node. In related technology, due to the fact that the threshold voltage is positively biased, the potential of a second node is insufficient, and then the accuracy of random k detection is not high. According to the embodiment of the invention, due to the coupling effect of the first capacitor, when the voltage of the third node rises, the voltage of the second node also rises, and the potential insufficiency of the second node and the third node caused by the positive bias of the threshold voltage can be compensated, so that the accuracy of random k detection is improved, and the service life and the taste of a product are improved.
Description
technical field [0001] The present application belongs to the technical field of electronic equipment, and in particular relates to an external compensation detection circuit, a driving circuit, a display device and a driving method. Background technique [0002] Compared with the traditional LCD (Liquid Crystal Display, liquid crystal display), AMOLED (Active-matrix Organic Light-emitting Diode, active-matrix organic light-emitting diode), as a new generation of display technology, has higher contrast, faster The response speed and wider viewing angle are widely used in the field of smart phones, and have been expanded to the fields of smart TVs and wearable devices through continuous development. [0003] In order to realize the detection of random k, the GOA circuit is usually provided with a k value detection module. The traditional 3T1C pixel external compensation circuit can detect the mobility of the drive transistor during the blanking period. However, in the exist...
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Login to View More IPC IPC(8): G09G3/3225
CPCG09G3/3225
Inventor 卢奕宏
Owner SHENZHEN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD