Touch Electrode Lead Routing for Lower RC Loading in OLED Panels
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Solution Overview
Problem
Existing touch display technologies face challenges in reducing signal attenuation and improving the signal-to-noise ratio of active styluses due to RC loading on touch leads, particularly in flexible and rollable OLED display apparatuses.
Innovation Solution
A touch display panel design with a touch electrode layer and leads that are routed to opposite binding regions through bending regions, reducing RC loading by leading touch leads from both ends of each electrode, and incorporating shielding lines and bridging lines to enhance signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch leads are routed to a single binding region, then the structure is simpler, but RC loading increases causing signal attenuation
Solution Approach 1:
The patent divides the lead routing into multiple paths by introducing multiple binding regions (first binding region and second binding region) and corresponding bending regions. Touch leads are segmented into different groups that route to different binding regions, reducing the RC loading effect on individual leads while maintaining overall structural organization.
Solution Approach 2:
The patent utilizes the vertical dimension by routing some leads through bending regions that extend to the back of the display panel, while others remain on the front surface. This three-dimensional routing approach allows leads to be distributed across different spatial layers, reducing planar congestion and RC loading effects.
2Reliability
If more binding regions are added to reduce RC loading, then signal attenuation decreases, but manufacturing complexity increases
Solution Approach 1:
The patent applies different routing strategies to different regions of the display panel. Specific binding regions are positioned at locations where they provide maximum signal integrity benefit, and the routing patterns are optimized locally for each region rather than applying a uniform approach across the entire panel.
Solution Approach 2:
The bending regions are designed with predetermined geometries and positions during the planning stage, allowing the routing structures to be formed in advance during fabrication. This preliminary design of the bending region configurations simplifies the actual manufacturing process by providing clear guidance for forming the complex routing paths.
Data Source
AI summary
Embodiments of the present disclosure provide a touch substrate, a touch display panel and a touch display apparatus. The touch display panel includes: a base substrate; a touch electrode layer on the base substrate and in a touch display region, the touch electrode layer including touch electrodes in the same layer and insulated from each other; and touch leads on the base substrate, each touch lead is electrically connected to a corresponding one touch electrode, some touch leads extend from the touch display region through the first bending region to the first binding region, and are bent to the back of the touch display panel in the first bending region, and the other touch leads extend from the touch display region through the second bending region to the second binding region, and are bent to the back of the touch display panel in the second bending region.