Bidirectional Shift Register for GOA Display Panels
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Solution Overview
Problem
The existing shift registers in Gate Driver on Array (GOA) technology can only support unidirectional scans, limiting their ability to implement bidirectional scanning in display panels.
Innovation Solution
A shift register design that includes multiple input and control units, allowing for both forward-scan and reverse-scan operations by using clock signals to control the flow of signals through transistors and capacitors, eliminating the need for additional high-voltage control signals and simplifying the circuit structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing shift register design is used, then circuit structure is simple, but bidirectional scanning capability is lost
Solution Approach 1:
The shift register circuit is designed to perform both forward scanning and reverse scanning functions using the same circuit structure. By configuring the first and second input units to respond to different clock signal phases, the circuit achieves bidirectional scanning capability without requiring separate circuits for each direction, thus improving versatility while controlling complexity.
2Adaptability or versatility
If additional high-voltage control signals are added, then bidirectional scanning is enabled, but power consumption increases
Solution Approach 1:
The invention utilizes phase changes in clock signals rather than voltage level changes to control bidirectional scanning. By adjusting the phase relationship between clock signals (0-degree phase for forward scan, 180-degree phase for reverse scan), the circuit achieves direction control without requiring additional high-voltage control signals, thereby enabling bidirectional scanning while maintaining low power consumption.
3Use of energy by moving object
If clock signals are used instead of high-voltage control signals, then power consumption is reduced, but control precision may be affected
Solution Approach 1:
The circuit incorporates feedback mechanisms where the output of each stage is fed back to control the next stage's switching. This feedback ensures precise control of signal propagation timing and direction, maintaining control precision while using standard clock signals instead of high-voltage control signals. The feedback loops ensure that switching occurs at the correct moments in the clock cycle.
Data Source
AI summary
A shift register and driving method thereof, a gate driving circuit and a display device are provided. The shift register includes a first input unit, a second input unit, a pull-up control unit, a pull-down control unit, an output control unit and an output reset unit, wherein the first input unit, the second input unit, the pull-up control unit, the pull-down control unit and the output control unit are coupled to a first node, and the pull-up control unit, the pull-down control unit and the output reset unit are coupled to a second node.