GOA Circuit Abnormality Protection for Embedded Touch Display Panels
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Solution Overview
Problem
Embedded touch display panels face the risk of abnormal display due to residual electric charges in pixels caused by abnormal power-off events in the GOA circuit, leading to unstable voltage levels.
Innovation Solution
A GOA circuit with cascaded levels, incorporating a forward/reverse scanning control module, node control module, output module, output control module, and an abnormality protection module, which includes a thin-film transistor to pull the scanning signal level up when the panel is powered off, ensuring constant voltage levels and preventing charge residue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the GOA circuit is used in embedded touch display panels, then the integrated touch panel technique can be implemented, but the risk of abnormal display due to residual charges cannot be eliminated during abnormal power-off events
Solution Approach 1:
The patent applies preliminary anti-action by introducing an abnormality protection module that proactively counteracts the harmful effect of residual charges before they can cause abnormal display. The module includes a protection transistor configured to release residual charges from pixel electrodes when abnormal power-off is detected, thereby preventing the display instability that would otherwise occur during power-off events.
2Stability of the object's composition
If constant-voltage high level is maintained at high voltage level, then normal display operation is ensured, but residual charges accumulate during abnormal power-off causing display abnormalities
Solution Approach 1:
The patent converts the harmful effect of residual charge accumulation into a beneficial protection mechanism. The abnormality protection module detects when abnormal power-off occurs and actively releases the residual charges that would otherwise cause display abnormalities. By transforming the potential harm into a controlled release mechanism, the system maintains display stability during power-off events while preserving the constant-voltage operation during normal use.
Data Source
AI summary
A GOA circuit and an embedded touch display panel are provided. By providing an abnormity protection module in the nth-level GOA unit, the level of the scanning signal of the nth-level GOA unit is pulled up when the embedded touch display panel is powered off abnormally. The risk of abnormal display resulted from the residual of charges in pixels due to the abnormal power-off of the GOA circuit is reduced.