GOA Reset Circuit Using Output Feedback to Prevent Multi-Output
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Solution Overview
Problem
The output terminal of the Gate Driver on Array (GOA) unit for the last row is always in a multi-output state due to the floating reset terminal, affecting the reliability and long-term stability of the GOA circuit.
Innovation Solution
A reset circuit comprising a first electronic switch circuit connected to the input terminal of the GOA unit and a second electronic switch circuit connected to the output terminal, where the first switch connects a low level signal to the reset terminal when the input is high, and the second switch connects a high level signal to the reset terminal when the output is high, ensuring proper operation and reset of the GOA unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If GOA units are integrated onto the array substrate to remove external gate driving circuits, then material cost and process complexity are reduced, but the reset terminal of the last row GOA unit floats causing multi-output state that degrades reliability
Solution Approach 1:
The patent implements a self-service mechanism where the GOA unit's own output terminal controls the reset function through electronic switch circuits. The output terminal feedback controls the electronic switch to automatically reset the floating reset terminal, enabling the circuit to self-correct without external intervention. This resolves the reliability issue while maintaining the integration benefits.
Solution Approach 2:
The patent introduces a feedback mechanism where the output terminal of the GOA unit is connected to control electronic switch circuits that manage the reset terminal. The output state feeds back to control the switching of electronic switches, which in turn control the reset signal application. This feedback loop ensures the floating reset terminal is properly managed, preventing multi-output states and improving reliability.
2Device complexity
If the reset terminal of the last row GOA unit is left floating to simplify circuit connections, then device complexity is reduced, but the output terminal remains in multi-output state affecting long-term stability
Solution Approach 1:
The patent applies preliminary action by proactively managing the reset terminal before the multi-output state can cause problems. The electronic switch circuits are configured to detect and reset the floating reset terminal in advance, preventing the occurrence of harmful multi-output states. This preliminary intervention ensures long-term stability without adding significant complexity.
3Reliability
If electronic switch circuits are added to control the reset terminal, then reliability and long-term stability are improved, but device complexity increases
Solution Approach 1:
The patent achieves multi-functionality by using the output terminal to serve dual purposes: normal output function and control function for the reset terminal. The same output terminal controls electronic switch circuits that manage resetting, allowing one component to perform multiple functions. This reduces the need for separate dedicated reset control circuits, thereby limiting the increase in overall device complexity.
Data Source
AI summary
A reset circuit for Gate Driver on Array, an array substrate and a display is used for increasing reliability and long-term stability of a GOA circuit and thus improving performance of the GOA circuit. The GOA reset circuit includes a first electronic switch circuit (301) connected to an input terminal of a GOA unit of the Gate Driver on Array (INPUT); and a second electronic switch circuit connected to an output terminal of the GOA unit (OUTPUT), wherein the first electronic switch circuit (301) is connected to a low level signal terminal and is switched on to connect the low level signal terminal to a reset terminal of the GOA unit (RESET) when the input terminal of the GOA unit (INPUT) is at a high level; and the second electronic switch circuit (302) is connected to a high level signal terminal and is switched on to connect the high level signal terminal to the reset terminal of the GOA unit (RESET) when the output terminal of the GOA unit (OUTPUT) is at a high level.