Touch Trace Layer Layout for Bright-Line Suppression in Display Panels
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Solution Overview
Problem
Display devices with touch screens suffer from poor display effects due to bright lines caused by the reflectivity of touch traces, which are not effectively addressed by existing anti-reflection polarizers, especially at oblique angles.
Innovation Solution
The display panel incorporates a touch trace with multiple line layers having different gradient angles, which diffuse external light reflections, reducing or eliminating bright lines and improving display quality without increasing resistance or frame width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If anti-reflection polarizer is used to reduce touch trace reflection, then reflection is reduced, but anti-reflection effect is poor at oblique angles
Solution Approach 1:
The touch trace is segmented into multiple line layers (first line layer and second line layer) with different gradient angles. This segmentation allows each layer to reflect light at different angles, collectively covering a broader range of viewing angles and effectively reducing reflection across various oblique angles.
Solution Approach 2:
The first line layer and second line layer are designed with asymmetric gradient angles relative to the normal direction of the touch screen. The first line layer has a first gradient angle while the second line layer has a second gradient angle that differs from the first, creating asymmetric reflection patterns that collectively reduce overall reflection effectiveness at multiple oblique angles.
2Object-affected harmful factors
If multiple line layers with different gradient angles are used in touch trace, then diffuse reflection effect is achieved and bright lines are reduced, but device complexity increases
Solution Approach 1:
The touch trace is divided into multiple line layers with different gradient angles, where each layer contributes to diffuse reflection. This segmentation approach achieves effective bright line reduction while maintaining a relatively simple overall structure that can be integrated into existing touch screen architectures.
Solution Approach 2:
Different line layers are assigned different gradient angles tailored to their specific positions and functions within the touch trace structure. This local quality differentiation optimizes the reflection control at each layer while maintaining overall structural simplicity and manufacturability.
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 solution effectively reduces or eliminates bright lines by diffusing external light reflections, thereby enhancing the display effect of the display device while maintaining manufacturing efficiency and simplicity.
Implementation Method 1
the touch trace has an effect of diffuse reflection on external light, such that the poor bright lines caused by reflection of the touch trace are reduced or eliminated
Data Source
AI summary
Provided is a display panel. The display panel includes: a substrate, including a display region, a periphery region, and a pad region, wherein the periphery region surrounds an outer periphery of the display region, and the pad region is disposed on a side, distal from the display region, of the periphery region; and a touch layer, disposed on the substrate and including a touch electrode and a touch trace, wherein the touch electrode is at least partially disposed in the display region, the touch trace is disposed in the periphery region and is electrically connected to the touch electrode, the touch trace is electrically connected to a pad disposed in the pad region, the touch trace includes at least two line layers laminated in a thickness direction of the substrate.