Bidirectional Shift Register for Display Gate Drivers
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Solution Overview
Problem
Traditional shift registers and gate drivers can only perform unidirectional scanning, limiting the compatibility and functionality of display panels.
Innovation Solution
A shift register design that includes an input-reset circuit and a driving circuit, capable of bidirectional scanning, which writes specific signal voltages into a pull-up node during different phases of scanning and outputs a gate driving signal when the voltage meets certain conditions, allowing for forward and reverse scanning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional shift register design is used, then the structure is simple, but bidirectional scanning capability is lost
Solution Approach 1:
The shift register circuit is designed to perform multiple functions by enabling both forward and reverse scanning operations through a unified circuit structure. The same circuit components can operate in different modes depending on the control signals applied, making the circuit universal rather than dedicated to a single scanning direction.
Solution Approach 2:
The circuit incorporates dynamic control mechanisms that allow the scanning direction to be changed during operation. By using control signals (such as REV signal) to dynamically switch the operation mode between forward and reverse scanning, the circuit adapts its behavior based on real-time requirements without requiring physical reconfiguration.
2Adaptability or versatility
If unidirectional scanning is implemented, then the circuit operation is simple, but compatibility with bidirectional display panels is limited
Solution Approach 1:
The gate driver circuit is designed to be compatible with both unidirectional and bidirectional display panels. By incorporating additional control terminals and signals (such as REV terminal and control signal), the same circuit can drive different types of display panels without requiring separate dedicated circuits for each type.
Solution Approach 2:
The circuit prepares for bidirectional operation by pre-configuring the necessary control terminals and signal paths. The REV terminal and associated control logic are built into the circuit structure in advance, allowing the circuit to switch to reverse scanning mode when needed without requiring external modifications or complex runtime reconfiguration.
3Adaptability or versatility
If forward scanning only is supported, then the signal processing is simple, but functional flexibility is reduced
Solution Approach 1:
The signal processing circuit dynamically adjusts its operation based on the scanning mode. Control signals such as REV enable the circuit to switch between forward and reverse scanning modes, with the signal paths and transistor operations adapting accordingly. This dynamic behavior allows flexible scanning mode selection without requiring completely separate circuits for each mode.
Data Source
AI summary
A shift register, a gate driver, a display panel and a driving method are provided. The shift register includes an input-reset circuit, which is connected with a pull-up node; and a driving circuit, which is connected with the pull-up node. The input-reset circuit is configured to: write a voltage of a first signal into the pull-up node in response to a second signal, in an input phase of forward scanning; write a voltage of a fourth signal into the pull-up node in response to a third signal, in a reset phase of forward scanning; write the voltage of the fourth signal into the pull-up node in response to the third signal, in an input phase of reverse scanning; and write the voltage of the first signal into the pull-up node in response to the second signal, in a reset phase of reverse scanning.