Display Shift Register Layout for Clock Noise Stability
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Solution Overview
Problem
Existing gate driving circuits in display substrates suffer from poor driving performance due to noise interference from clock signal changes, especially after reliability tests, leading to instability and reduced service life.
Innovation Solution
The display substrate incorporates oxide transistors and a second control circuit that pulls down the potential of a second node, allowing it to be easily pulled up to a high level, while noise reduction circuits mitigate noise effects, ensuring stable performance and longer service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If noise reduction circuits are added to mitigate noise interference, then the stability of the shift register is improved, but the device complexity increases
Solution Approach 1:
The patent introduces noise reduction circuits as intermediary components between the clock signal line and the shift register. These circuits include noise reduction transistors and capacitors that act as mediators to filter and reduce noise interference from clock signal changes, thereby improving the stability of the shift register without directly increasing its core functionality.
Solution Approach 2:
The patent extracts and isolates the noise reduction function from the main shift register circuitry by adding separate noise reduction circuits. This allows the noise filtering function to be implemented independently, improving stability while minimizing the impact on the overall device complexity by keeping the noise reduction mechanisms as separate modules.
2Ease of operation
If the second control circuit pulls down the potential of the second node, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
Instead of directly providing a pull-up path for the second node, the patent uses an inverted approach by adding a control circuit that pulls down the potential of the second node. This inversion strategy simplifies the operation of pulling up the second node by using complementary control mechanisms, thereby improving ease of operation while managing device complexity through systematic control design.
3Productivity
If oxide transistors are used in the shift register, then the productivity is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent employs oxide transistors with specific parameter characteristics (such as threshold voltage and on-current) that are optimized for high productivity. By carefully selecting and controlling these parameters during the manufacturing process, the patent achieves improved productivity while managing manufacturing precision requirements through parameter optimization rather than requiring extremely tight tolerances.
Data Source
AI summary
A display substrate and a display device are provided, the display substrate includes a base substrate, and a shift register and a clock signal line that are on the base substrate; the shift register includes an input circuit, an output circuit, a first control circuit, a second control circuit, a first noise reduction circuit and a second noise reduction circuit; the input circuit includes a first transistor and a second transistor, the first transistor and the second transistor are both oxide transistors, and the second node is connected to the second voltage signal only through the second control circuit, and a potential of the second node is pulled down only through the second control circuit.