Touch Link Line Resistance Equalization in Display Devices
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Solution Overview
Problem
Existing display devices face issues with exterior defects where spots are visually recognized in the non-active areas due to differences in metal exposure areas, leading to reflective visibility and potential RC value adjustments challenges.
Innovation Solution
The display device incorporates touch link lines in the non-active area with varying configurations, such as different widths, lengths, and shapes, to ensure equal resistance, thereby preventing spot formation and enhancing the degree of freedom in adjusting the RC value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If touch link lines are designed with different configurations in the non-active area, then resistance equalization is achieved and spots are prevented, but device complexity increases
Solution Approach 1:
The patent applies local quality by designing touch link lines with different configurations (straight, zigzag, curved shapes and varying widths) specifically in the non-active area, while keeping the active area design standard. This localized differentiation achieves resistance equalization across all touch link lines without requiring complete redesign of the entire touch sensing structure, thus resolving the contradiction between manufacturing precision and device complexity.
2Reliability
If touch link lines are designed with varying shapes to equalize resistance, then exterior defects are prevented, but ease of manufacture decreases
Solution Approach 1:
The patent segments the touch link line design into two distinct parts: the active area portion with standard configuration and the non-active area portion with varied configurations (straight, zigzag, curved). This segmentation allows the complex varied-shape design to be implemented only where needed for resistance equalization, while the majority of the structure maintains simple standard design, thus resolving the contradiction between reliability and ease of manufacture.
3Adaptability or versatility
If touch link lines are configured in parallel in the non-active area, then RC value adjustment flexibility increases, but device complexity increases
Solution Approach 1:
The patent implements dynamics by configuring touch link lines in parallel arrangements in the non-active area, allowing for flexible adjustment of RC values through selective connection and configuration. This dynamic design enables the system to adapt RC characteristics as needed while maintaining a relatively simple overall structure by limiting the parallel configuration to the non-active area only, thus resolving the contradiction between adaptability and device complexity.
Data Source
AI summary
A display device may include an active area and a non-active area; a touch sensing structure disposed in the active area and including touch electrodes; touch pads disposed in the non-active area and electrically connected to the touch electrodes; and touch link lines connecting the touch pads and the touch electrodes and disposed in the non-active area. The touch electrodes and the touch pads may be disposed along the same one direction. At least a portion of at least one of the touch link lines may have a zigzag shape. The touch link lines disposed in the non-active area may have equal resistance by having different configurations or shapes of the touch link lines.