Static threshold voltage compensation circuit

A threshold voltage and compensation circuit technology, applied in the field of compensation circuits, can solve the problems of increasing the calculation cycle and limiting the maximum operating frequency of the driving circuit, so as to achieve the effects of increasing the operating frequency, ensuring the consistency of the driving current, and improving the consistency of light emission

CN114067728AActive Publication Date: 2022-02-18ZHEJIANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2022-02-18

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Abstract

The invention provides a static threshold voltage compensation circuit, and belongs to the technical field of threshold voltage compensation. The static threshold voltage compensation circuit comprises a reverse threshold voltage extraction circuit, a flip voltage follower and a pixel point driving circuit, the output end of the reverse threshold voltage extraction circuit is connected with the input end of the flip voltage follower, and the output end of the flip voltage follower is connected with the input end of the pixel point driving circuit. The circuit can effectively guarantee the consistency of LED driving current, improves the light emitting consistency, and can improve the working frequency of the compensation circuit.
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Description

technical field

[0001] The invention belongs to the technical field of compensation circuits, and in particular relates to a static threshold voltage compensation circuit capable of compensating for transistor threshold voltage drift of an AMOLED display screen. Background technique

[0002] Due to the advantages of high luminance, high contrast, and wide viewing angle, AMOLED displays are widely used in window displays, wearable devices, AR / VR devices, and other fields. However, in practical applications, the threshold voltage of the first transistor M1 will drift when the first transistor M1 works for a long time, which will cause the driving current of the LED to change, and finally cause the luminance of the pixel to change, which will affect the display quality.

[0003] In order to solve the problem of threshold voltage drift, many studies have proposed compensation circuits, such as voltage compensation and current compensation. Because the compensation time of curren...

Examples

Embodiment Construction

[0026] The following are specific embodiments of the present invention and in conjunction with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0027] Such as figure 1 As shown, the static threshold voltage compensation circuit includes a reverse threshold voltage extraction circuit, an inversion voltage follower and a pixel point driving circuit. Wherein, the reverse threshold voltage extraction circuit is connected between the high level and the low level and its output terminal is connected to the input terminal of the flipping voltage follower; the flipping voltage follower is connected between the high level and the low level and its output terminal is connected to The input end of the pixel point driving circuit; the pixel point driving circuit is connected to the high level, data input and strobe input.

[0028] Specifically, as figure 2 As shown, the re...