Asymmetrical Scanning Drive Circuits for Display Panel Center Alignment
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Solution Overview
Problem
Conventional display panels with integrally formed scanning signal line drive circuits are not compatible with non-integral-type display panels, and they are prone to leakage and wiring breaks, which reduces yield.
Innovation Solution
The display panel features asymmetrical scanning signal line drive circuits with different sizes and configurations on both sides, including varying transistor sizes, wiring widths, and spacings, to match the center position of a non-integral-type display panel and reduce wiring issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If scanning signal line drive circuits are integrally formed on both sides of the display region with the same configuration, then the display panel achieves symmetry and manufacturing simplicity, but the center position of the display region does not match that of non-integral-type display panels, causing incompatibility
Solution Approach 1:
The patent applies asymmetry by configuring the first and second scanning signal line drive circuits with different numbers of stages. Specifically, when the number of scanning signal lines is divisible by 4, the first drive circuit has N/4 stages and the second has N/4-1 stages. This asymmetric configuration shifts the display region center to match non-integral-type panels while maintaining manufacturing feasibility through systematic design rules.
Solution Approach 2:
The patent implements local quality by making different portions of the drive circuits have different characteristics. The first scanning signal line drive circuit uses N/4 stages while the second uses N/4-1 stages, creating localized differences in circuit configuration. This allows the overall system to achieve compatibility with non-integral panels while maintaining systematic manufacturing processes.
2Area of stationary object
If scanning signal line drive circuits are integrally formed on the display panel, then the display device size is reduced, but leakage between wiring lines and breaks in wiring lines occur more frequently, reducing yield
Solution Approach 1:
The asymmetric configuration of drive circuits with different stage numbers (N/4 vs N/4-1) creates an optimized wiring layout that reduces the total length and complexity of interconnections. This asymmetric design distributes wiring stress more evenly and reduces the probability of leakage and breaks while maintaining the compact integrated structure.
Solution Approach 2:
The patent changes the structural parameters of the drive circuits by using different numbers of stages in the first and second circuits. This parameter variation optimizes the wiring configuration, reducing wiring density in critical areas and thereby improving reliability against leakage and breaks while maintaining compact size.
3Adaptability or versatility
If asymmetrical scanning signal line drive circuits with different sizes are used, then compatibility with non-integral-type display panels is achieved and wiring issues are reduced, but the device complexity increases
Solution Approach 1:
The patent applies asymmetry in a controlled and systematic way, using different stage numbers (N/4 vs N/4-1) based on clear mathematical rules. This systematic asymmetry achieves compatibility with non-integral panels while maintaining design regularity, thereby limiting the increase in complexity to only what is necessary for compatibility.
Solution Approach 2:
The local differentiation in circuit stages is applied only where necessary to achieve center position alignment, rather than throughout the entire device. This localized asymmetry minimizes the overall complexity increase while achieving the compatibility goal.
Data Source
AI summary
On a display panel 10, a first scanning signal line drive circuit 12 is formed along a side of a display region 11 and a second scanning signal line drive circuit 13 is formed along the opposite side by the same process as pixel circuits. The size of a transistor included, the width of a wiring line, or the like, differs between the first and second scanning signal line drive circuits 12 and 13, and the two scanning signal line drive circuits have different sizes in a lateral direction. By this, the center of the display region matches that of a non-integral-type display panel, ensuring compatibility with the non-integral-type display panel. Moreover, by suitably determining the widths of or spacings between wiring lines included in the two scanning signal line drive circuits, leakage between the wiring lines and breaks in the wiring lines are reduced, improving yield of display panels.