Integrated Scan Driving Circuit for Narrow Bezel Displays
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Solution Overview
Problem
Existing display technologies face challenges in reducing costs and improving yield due to the complexity of scan driving circuits, which often require multiple independent driving circuits, leading to a large bezel size and hindering the achievement of a narrow bezel design.
Innovation Solution
A display substrate with an integrated scan driving circuit that includes a first voltage signal line, a second voltage signal line, and a third voltage signal line, along with cascaded shift registers, where the shift registers have specific transistor configurations and signal line arrangements to efficiently transmit scan signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple independent driving circuits are used, then the scan driving function is achieved, but the bezel size becomes large
Solution Approach 1:
The patent combines multiple independent driving circuits into a single integrated scan driving circuit that can control multiple gate lines. The scan driving circuit includes a shift register with multiple output terminals, where each output terminal is electrically connected to different gate lines, allowing one circuit to perform the function of multiple circuits and thereby reducing bezel size.
2Reliability
If multiple independent driving circuits are used, then the scan driving function is achieved, but the structure becomes complex
Solution Approach 1:
The patent merges multiple driving circuit functions into a single integrated circuit structure. The shift register includes multiple output terminals (first output terminal, second output terminal, third output terminal, fourth output terminal) that can drive different gate lines, eliminating the need for separate driving circuits and simplifying the overall structure.
Solution Approach 2:
The scan driving circuit is designed with multi-functionality, where a single circuit can drive multiple gate lines through its multiple output terminals. This universal design allows the same circuit structure to perform multiple driving functions, reducing both complexity and component count.
3Area of stationary object
If the number of driving circuits is reduced, then the bezel size is reduced, but the integration difficulty increases
Solution Approach 1:
The patent segments the driving function into multiple independent output terminals within the shift register, where each output terminal can independently drive a gate line. This segmentation allows the integrated circuit to be designed as a modular structure that is easier to manufacture and integrate, as each segment can be independently tested and replaced if needed.
Data Source
AI summary
A display substrate includes at least one scan driving circuit. The scan driving circuit includes a first voltage signal line, a second voltage signal line, a third voltage signal line, and shift registers. A shift register includes: first and second transistors disposed between the first voltage signal line and the second voltage signal line, third and fourth transistors disposed between the second voltage signal line and the third voltage signal line, at least one first scan signal line electrically connected to a first output terminal, and at least one second scan signal line electrically connected to a second output terminal. A second electrode of the first transistor and a second electrode of the second transistor are both electrically connected to the first output terminal; a second electrode of the third transistor and a second electrode of the fourth transistor are both electrically connected to a second output terminal.