Shift Register Layout for Stable Display Substrate Output
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Solution Overview
Problem
Existing display substrates face instability in output signals from the shift register unit while maintaining the original Pixel per Inch (PPI), leading to potential display abnormalities.
Innovation Solution
A display substrate design featuring a shift register unit with a specific arrangement of transistors, capacitors, and voltage lines at the edge area, including an on-off control circuit, energy storage circuits, and node control circuits, which ensures signal stability without increasing the vertical dimension, thus maintaining the original PPI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shift register unit is positioned at the edge area with specific arrangement of transistors and capacitors, then the output signal stability is improved, but the device structure becomes more complex
Solution Approach 1:
The patent positions the shift register unit at the edge area of the display substrate rather than in the central display area, utilizing the vertical/dimensional space at the boundary. This spatial reconfiguration allows the inclusion of additional control circuits (on-off control circuit with first transistor, energy storage circuit with first capacitor, fourth node control circuit with second transistor) without encroaching on the pixel array area, thus improving output signal stability while maintaining the original PPI and avoiding increase in device complexity
Solution Approach 2:
The shift register unit is segmented into distinct functional modules: on-off control circuit, energy storage circuit, fourth node control circuit, and output circuit. Each module performs a specific function and can be independently optimized. This segmentation allows the complex functionality to be organized in a structured manner at the edge area, making the overall device manageable despite the increased functional complexity
2Length of stationary object
If transistors are aligned in a specific arrangement, then the vertical dimension is maintained, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies different arrangement strategies to different components within the shift register unit. The first transistor, first capacitor, and second transistor are arranged in specific sequences at the edge area with optimized spacing and orientation. This localized optimization of component arrangement allows the vertical dimension to be maintained while reducing the overall alignment precision requirements compared to a uniform high-precision arrangement across the entire device
Data Source
AI summary
A display substrate and a display device. The display substrate includes a base and a shift register unit provided on the base; the shift register unit includes a first first voltage line, an on-off control circuit, a first energy storage circuit and a fourth node control circuit; the on-off control circuit comprises a first transistor, and the first energy storage circuit includes a first capacitor; at least part of the first first voltage line extends in the a first direction; the fourth node control circuit includes a second transistor; the first capacitor, the first transistor, the first first voltage line and the second transistor are arranged in a second direction; the second transistor, the first first voltage line, the first transistor and the first capacitor are arranged in sequence along a direction close to the display area; the first direction intersects the second direction.