Parallel Sub-Signal Lines for Touch Screen Resistance Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current touch screens face challenges in achieving uniform channel resistance due to varying distances of touch electrodes to the touch driving circuit, leading to non-uniform signal line lengths and resistances, which affects performance and functionality.
Innovation Solution
The implementation of a substrate with main signal lines comprising multiple sub signal lines connected in parallel, where the number of sub signal lines varies based on distance from the touch driving circuit, and touch electrodes are connected through these main signal lines to reduce resistance and enhance uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single signal lines are used to connect touch electrodes to the touch driving circuit, then the structure is simple, but the channel resistance varies significantly due to different distances
Solution Approach 1:
The signal line is divided into multiple sub-signal lines connected in parallel to form a main signal line. This segmentation reduces the channel resistance by providing multiple parallel paths for current flow, thereby improving the uniformity of channel resistance across different touch electrodes regardless of their distances from the touch driving circuit.
Solution Approach 2:
The patent applies different numbers of sub-signal lines to different main signal lines based on their specific needs. Main signal lines connecting touch electrodes farther from the touch driving circuit use more sub-signal lines to compensate for the longer distance and higher resistance, while closer electrodes use fewer sub-signal lines. This localized optimization achieves uniform channel resistance without unnecessary complexity throughout the entire system.
2Adaptability or versatility
If multiple functions are added to the touch screen, then the functionality is enhanced, but the requirement for uniform channel resistance becomes more critical and difficult to achieve
Solution Approach 1:
The segmentation of signal lines into multiple sub-signal lines provides a flexible framework that can support multiple touch screen functions. The parallel structure reduces resistance variations that would otherwise interfere with advanced functions like floating touch, waterproofing, and active/passive pen support, thereby enabling these functions to operate reliably.
Solution Approach 2:
The patent changes the parameter of signal line configuration by using multiple sub-signal lines in parallel with varying numbers across different main signal lines. This parameter change optimizes the electrical characteristics (resistance) to support multiple functions while maintaining uniform channel resistance, allowing the touch screen to achieve floating touch, waterproofing, and pen support capabilities.
3Reliability
If signal line lengths are made uniform, then channel resistance uniformity is improved, but the layout flexibility and adaptability to different electrode positions is reduced
Solution Approach 1:
Instead of making all signal lines the same length, the patent segments them into multiple sub-signal lines connected in parallel. This allows each main signal line to be tailored with an appropriate number of sub-signal lines based on its distance from the touch driving circuit, maintaining layout flexibility while achieving resistance uniformity through the parallel structure.
Solution Approach 2:
The patent applies local quality by configuring different numbers of sub-signal lines in different main signal lines according to their specific distances from the touch driving circuit. This localized adaptation allows the system to maintain layout flexibility for various electrode positions while ensuring each channel achieves uniform resistance through its optimized local configuration.
Data Source
AI summary
A substrate and a display device are disclosed. The substrate includes at least one main signal line. Each of the at least one main signal line includes a plurality of sub signal lines connected in parallel with one another. By arranging a plurality of sub signal lines connected in parallel with one another in the main signal line, the resistance of the main signal line can be reduced effectively, which is favorable to improving uniformity for the channel resistances of the touch screen.