Flexible Display Array Substrate Shift Register Curvature Compensation
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Solution Overview
Problem
The curvature of flexible display panels affects the structure and performance of switches in the Gate On Array (GOA) circuit, leading to poor switching electrical properties and issues like bright and dark lines.
Innovation Solution
An array substrate with a shift register circuit having multiple stages of switches, where the distance between the first and second ends of each switch is increased to accommodate curvature changes, and a compensation circuit is included to maintain consistent electrical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the GOA circuit is directly fabricated on the array substrate to reduce production process and cost, then manufacturing complexity and product cost are reduced, but the switching electrical performance deteriorates due to curvature changes in flexible display panels
Solution Approach 1:
The patent applies different switch structures to different locations on the array substrate. Specifically, switches near the edge of the substrate (where curvature effects are most pronounced) are designed with longer channel lengths or adjusted geometries compared to switches in the center region. This local differentiation compensates for the non-uniform stress and deformation caused by panel curvature, maintaining consistent switching performance across the entire GOA circuit while preserving the integrated manufacturing approach.
2Adaptability or versatility
If the display panel is made flexible with curvature, then adaptability and form factor are improved, but the switch performance deteriorates due to curvature-induced structural changes
Solution Approach 1:
The patent modifies key geometric parameters of the switches in the GOA circuit to compensate for curvature effects. This includes adjusting the channel length, width, and aspect ratio of transistors based on their position relative to the substrate edge. By changing these physical parameters, the patent counteracts the electrical property changes induced by panel curvature, allowing the flexible display to maintain reliable switching performance across different bending radii and curvature conditions.
3Ease of manufacture
If uniform switch structure is used across the array substrate, then manufacturing simplicity is maintained, but non-uniform output occurs due to curvature effects causing bright and dark lines
Solution Approach 1:
The patent implements position-dependent switch design where the geometric characteristics of switches vary systematically across the substrate. Switches closer to the substrate edges are designed with different dimensions (such as longer channel lengths or adjusted finger configurations) compared to central switches. This local quality differentiation compensates for the non-uniform stress distribution and curvature effects, ensuring uniform light output and eliminating bright and dark line defects while remaining compatible with standard manufacturing processes.
Data Source
AI summary
An array substrate, where the array substrate includes a substrate, an active switch, a shift register circuit disposed at a side edge of the substrate and including multiple stages of shift registers, and each of the shift registers includes a first switch, a second switch, a third switch, a fourth switch, and a fifth switch, in which the distance between a first end and a second end of the plurality of switches of the shift registers is greater than a distance between a first end and a second end of the active switch. Hence, increasing the distance between the first end and the second end of the plurality of switches of the shift registers.