Stacked Touch Traces Block Light Leakage in Display Frame
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Solution Overview
Problem
Current touch display panels experience light leakage due to diffusely reflected light from rough surfaces and bubble lines formed between the optical adhesive and display substrate, which passes through gaps in the touch circuit, causing unwanted light emission from the display region.
Innovation Solution
A touch display panel design featuring touch traces stacked to cover the rough contact surface area of the optical adhesive in the frame region, with each trace's projection on the display substrate covering the adhesive's projection, effectively shielding diffusely reflected light, and optionally using multiple layers with transparent adhesive material to maintain insulation and interlayer thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch traces are arranged in gaps among touch traces on the same layer, then insulation between traces is maintained, but light leakage occurs through the gaps
Solution Approach 1:
The patent transitions from a single-layer touch trace arrangement to a multi-layer stacked arrangement. By stacking touch traces on different layers (first layer and second layer), the design eliminates gaps that cause light leakage while maintaining insulation through the layered structure. The orthogonal projection of traces on the display substrate shows complete coverage, blocking light paths that would otherwise leak through gaps in a single-layer configuration.
2Object-generated harmful factors
If touch traces completely cover the rough contact surface area, then light leakage is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent divides the touch trace structure into multiple segments across different layers. Instead of requiring a single continuous trace to cover the entire rough contact surface, the design uses multiple trace segments on the first layer and second layer that collectively provide coverage. This segmentation reduces the precision requirement for each individual trace while achieving the overall light-blocking function.
Solution Approach 2:
The patent implements a nested structure where touch traces on the first layer are positioned within gaps of traces on the second layer, and vice versa. The orthogonal projection shows that traces on different layers overlap and cover each other's gaps. This nested arrangement provides comprehensive coverage of the rough contact surface area while distributing the manufacturing tolerance across multiple layers, reducing the precision burden on any single layer.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The stacked touch traces completely cover the rough contact surface area, significantly reducing light leakage by blocking diffusely reflected light, thereby enhancing the display panel's light-tightness and reducing unwanted light emission.
Implementation Method 1
each of the touch traces is arranged to be stacked, and an orthographic projection of each of the touch traces on the display substrate completely covers an orthographic projection of the part, located in the frame region, of the first optical adhesive on the display substrate
Data Source
AI summary
The present disclosure provides a touch display panel and a display device. The touch display panel includes a display substrate, a touch circuit on a side of a light emergent surface of the display substrate and a first optical adhesive between the display substrate and the touch circuit, wherein a rough contact surface exists on a part, located in a frame region, of the first optical adhesive; the touch circuit includes: a plurality of touch traces insulated from one another and located in the frame region; each of the touch traces is arranged to be stacked, and an orthographic projection of each of the touch traces on the display substrate covers an orthographic projection of a part, located in the frame region, of the first optical adhesive on the display substrate.