goa circuit and goa circuit overcurrent protection detection method

Abstract

The invention provides a GOA circuit over-current protection detection method. The method is used to determine whether a current inputting in a display panel satisfies a over-current protection starting condition. A GOA circuit comprises a level conversion circuit. The level conversion circuit comprises a current integrating circuit and a first comparator which is connected to the current integrating circuit. After carrying out operational amplification on the input current, the current integrating circuit inputs a comparison voltage to the first input end of the first comparator and inputs areference voltage to the second input end of the first comparator. The first comparator compares and processes the voltage values of the comparison voltage and the reference voltage and then outputs acontrol signal for starting over-current protection. The method has advantages that in the over-current protection detection method of the GOA circuit, a detection module is additionally installed inthe level conversion circuit; according to the input current operational amplification, the comparison voltage is output; after the output comparison voltage and the set reference voltage are compared, the control signal is output; and the over-current protection of an instantaneous heavy current which does not need protection can be eliminated.

Description

technical field [0001] The invention relates to the technical field of display driving, in particular to a GOA circuit and a GOA circuit overcurrent protection detection method. Background technique [0002] At present, the driving structure of TFT-LCD (thin film transistor-liquid crystal display panel) is more and more adopted the design of GOA (Gate On Array, row driving technology of array substrate), and the function of gate gate control circuit is passed on the liquid crystal panel through the TFT circuit. Realized, thereby effectively reducing the design cost. However, there are safety issues associated with GOA technology, because the GOA signal voltage value is very large, so when there is a short circuit problem in the array substrate, the current of the GOA control signal will increase, causing the temperature of the short circuit point on the panel to be too high, and even There is a risk of melting the screen, so a detection mechanism is needed to protect agains...

AI Technical Summary

Problems solved by technology

But this technology has an obvious technical defect, because of the Couple (coupling) effect between the Data (data line) and Gate (gate line) in the array substrate, the GOA signal may have some instantaneous high current phenomenon, and then trigger the IC OCP (OverCurrent Protection, over-current protection circuit) protection; in fact, such an instantaneous large current will not have any impact on the normal operation of the array substrate, which is a false trigger

[0004] To sum up, when the overcurrent protection detection mechanism in the existing GOA circuit detects the GOA signal value at a certain time point or time period, it may cause the coupling between the data and the Gate in the array substrate to form a The instantaneous large current is misjudged as an overcurrent phenomenon, which further triggers the overcurrent protection, which may cause undervoltage defects in the display pixels

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