Shift Register Output Control Circuit for Display Panel Multi-Output Prevention
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Solution Overview
Problem
In display panel technologies, the integration of gate driver circuits on array substrates (GOA) leads to non-uniform transistor characteristics and electromagnetic interference, causing multi-output phenomena that result in display abnormalities and reduced product reliability due to the lack of effective monitoring mechanisms.
Innovation Solution
A shift register unit with an output control circuit is implemented, which includes a second input terminal, output terminal, and reset terminal, connected to the first output terminal of a cascaded shift register unit, allowing for automatic control of output levels to prevent multi-output phenomena and ensure normal display operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If gate driver circuits are integrated on array substrates (GOA), then manufacturing cost and frame rate are improved, but non-uniform transistor characteristics and electromagnetic interference cause multi-output phenomena reducing reliability
Solution Approach 1:
The patent introduces a feedback mechanism where the output of each shift register unit is connected back to control the output control circuit of the same unit. This feedback loop monitors the output state and adjusts the control signals to prevent multi-output phenomena, ensuring reliable operation while maintaining high frame rate performance
Solution Approach 2:
The gate driver circuit is divided into multiple independent shift register units, each with its own output control circuit. This segmentation allows individual units to be monitored and controlled separately, preventing multi-output issues in specific units while maintaining overall system performance
2Adaptability or versatility
If shift register units are cascaded to drive multiple gate lines, then coverage is improved, but electromagnetic interference between units increases
Solution Approach 1:
The output control circuit acts as an intermediary between the shift register circuit and the gate line. It receives signals from the shift register unit, processes them through control logic, and outputs controlled signals to the gate line. This intermediary structure isolates electromagnetic interference from the gate line while maintaining signal transmission functionality
Solution Approach 2:
The patent extracts the control function from the shift register unit by introducing a separate output control circuit. This separation allows the shift register unit to generate signals while the output control circuit manages electromagnetic interference and signal conditioning, enabling extended coverage without proportional increase in interference
3Reliability
If output control circuit is added to each shift register unit, then multi-output phenomena are prevented, but device complexity increases
Solution Approach 1:
The output control circuit is designed to perform multiple functions: it controls the output signal from the shift register unit, monitors for multi-output conditions, and generates appropriate control signals. By making this single circuit multi-functional, the patent prevents multi-output phenomena without requiring separate dedicated circuits for each function, thereby limiting the increase in device complexity
Data Source
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Figure 3~4A
Figure 4B~4C
AI summary
A shift register unit, a gate drive circuit, a display device and a method of driving a gate drive circuit are provided. The shift register unit (10) includes a shift register circuit (200) and an output control circuit (100). The shift register circuit (200) is configured to output a valid output level at a first output terminal (OUT1) according to a first input signal received by a first input terminal (INPUT 1), and is configured to reset according to a first reset signal received by a first reset terminal (RST1). The output control circuit (100) includes a second input terminal (INPUT2) electrically connected to the first output terminal (OUT1) and is configured to output an invalid output level at the second output terminal (OUT2) according to a second input signal received by the second input terminal (INPUT2), thereby controlling a level of the first output terminal (OUT1) to the invalid output level, and is configured to reset according to a second reset signal received by the second reset terminal (RST2). The shift register unit (10) avoids the multi-output phenomenon and improves the display quality of the display panel.