Dual-Layer Touch Line Layout for Consistent OLED Panel Signals
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Solution Overview
Problem
Existing OLED display panels face challenges in ensuring consistent touch driving and sensing signals across touch lines with varying resistances, which can affect touch performance and reliability, especially in non-display regions.
Innovation Solution
The display panel incorporates a dual-layer touch line structure with via holes connecting touch lines of different resistances, ensuring consistent touch driving and sensing signals by merging signals at via holes, and optimizing signal transmission through a touch insulation layer with strategically placed via holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer touch line structure is used, then the device complexity is reduced, but the signal consistency across different touch lines deteriorates due to varying resistances
Solution Approach 1:
The patent transitions from a single-layer touch line structure to a multi-layer structure with first and second touch lines at different layers. This dimensional change allows for better signal consistency by providing multiple pathways for signal transmission, compensating for resistance variations in individual lines.
Solution Approach 2:
The touch line system is segmented into multiple independent lines (first touch line and second touch line) with different resistance characteristics. Each line can be independently optimized and connected to touch electrodes, allowing for better overall signal consistency despite individual line variations.
2Manufacturing precision
If touch lines with different resistances are used to reduce device complexity, then the manufacturing precision is improved, but the touch performance deteriorates due to signal inconsistencies
Solution Approach 1:
The patent intentionally uses touch lines with different resistance parameters (first touch line with first resistance, second touch line with second resistance). This parameter variation is compensated by the multi-layer structure and strategic via hole placement, maintaining both manufacturing flexibility and touch performance.
Solution Approach 2:
Via holes serve as intermediary connection elements between the first and second touch lines at different layers. These via holes enable signal transfer and compensation between lines with different resistances, ensuring consistent touch performance despite manufacturing variations.
3Device complexity
If via holes are placed only at connection parts, then the device complexity is reduced, but the signal integrity deteriorates in non-display regions
Solution Approach 1:
The patent applies different via hole placement strategies for different regions: in connection parts, via holes connect touch lines to touch electrodes, while in non-display regions, via holes are strategically placed to maintain signal integrity between first and second touch lines. This localized quality adjustment ensures optimal signal transmission in each region.
Data Source
AI summary
A display panel includes: a base substrate; a first touch layer including a first touch line; a touch insulation layer provided with a via hole; and a second touch layer including a second touch line. The second touch line is connected to the first touch line through the via hole; a part of the first touch line and/or the second touch line connected to the functional structure of the display panel forms a connection part. At least one functional structure includes a touch electrode; the first touch line includes a first part and a second part, the second touch line includes a third part and a fourth part, the first part and/or the third part are connected to the touch electrode, and the third part is connected to the first part through at least one via hole.