GOA Scanning Circuit Bidirectional Signal Routing
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Solution Overview
Problem
Conventional Gate Driver on Array (GOA) scanning circuits require more thin-film transistors and signal lines for bi-directional scanning, which is not suitable for narrow-frame or no-frame liquid crystal display designs.
Innovation Solution
A GOA scanning circuit with multiple cascaded units, including forward and backward scanning modules using P-type thin-film transistors, where the number of signal lines and transistors is reduced by utilizing a first and second thin-film transistor connected to clock signals and a node, with control terminals connected to stage-transferring signals from previous and next stages, and an output module using additional transistors and capacitors to manage voltage levels for scanning signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional GOA scanning circuit uses bi-directional scanning function, then scanning flexibility is improved, but number of thin-film transistors and signal lines increases
Solution Approach 1:
The patent applies multi-functionality by designing the GOA scanning circuit to support both forward and backward scanning directions using the same set of thin-film transistors and signal lines. The circuit achieves bidirectional scanning capability without requiring separate dedicated circuits for each direction, thereby reducing overall device complexity while maintaining scanning flexibility.
Solution Approach 2:
The patent implements dynamic scanning direction control by using control signals to dynamically switch between forward and backward scanning modes. The scanning direction can be changed during operation based on display requirements, allowing the circuit to adapt its behavior dynamically without increasing the number of physical components.
2Adaptability or versatility
If GOA circuit uses more thin-film transistors for bi-directional scanning, then scanning function is improved, but display area is occupied more
Solution Approach 1:
The patent makes the existing thin-film transistors and signal lines perform multiple functions by enabling them to operate in both forward and backward scanning directions. This eliminates the need for additional dedicated components for bidirectional scanning, thereby reducing the non-effective display area while maintaining complete scanning functionality.
Solution Approach 2:
The patent merges the forward scanning circuit and backward scanning circuit into a single integrated GOA scanning circuit. By combining both scanning directions into one circuit structure, the patent reduces the total component count and minimizes the area occupied by non-effective display regions.
Data Source
AI summary
The present invention discloses a liquid crystal display device and a GOA scanning circuit. The GOA scanning circuit includes multiple cascaded GOA circuit units, and an n-th stage GOA circuit unit includes: a forward and backward scanning module including a first thin-film transistor and a second thin-film transistor, wherein, two current path terminals of the first thin-film transistor are respectively connected with a first clock signal and a first node; two current path terminals of the second thin-film transistor are respectively connected with a second clock signal and the first node; a control terminal of the first thin-film transistor is connected with a stage-transferring signal STn−1 of a previous stage GOA circuit unit; a control terminal of the second thin-film transistor is connected with a stage-transferring signal STn+1 of a next stage GOA circuit unit.