Touch Sensor Electrode Layout to Suppress Display Edge Reflections
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Solution Overview
Problem
External light reflected by components in the non-display area of a display device causes visibility issues due to interference phenomena, reducing the overall visibility and quality of the display.
Innovation Solution
A display device design incorporating a light-blocking layer with a non-light-blocking area between the display and bezel area, featuring a conductive layer with through holes and a sensing-insulating layer to minimize light reflection interference by varying hole distances and shapes, ensuring electrical contact between constant voltage electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light-blocking layer is added to block external light, then visibility is improved, but device complexity increases
Solution Approach 1:
The light-blocking layer is integrated with the existing touch sensor structure, serving dual functions: blocking external light from causing interference patterns and maintaining touch sensitivity. The conductive layers and insulating layers serve both electrical and optical functions, eliminating the need for separate components.
Solution Approach 2:
The patent merges the light-blocking function with the touch sensing layer structure. The first and second conductive layers, along with the sensing-insulating layer, are combined to form an integrated assembly that provides both touch sensing capability and light-blocking functionality, reducing overall device complexity.
2Reliability
If through holes are added for electrical contact, then electrical conductivity is improved, but light reflection interference increases
Solution Approach 1:
The sensing-insulating layer is applied selectively in specific regions. It is positioned to cover areas where light reflection would be problematic while leaving through holes in strategic locations for electrical contact. This localized application ensures electrical conductivity is maintained where needed while preventing light interference in critical viewing areas.
Solution Approach 2:
The sensing-insulating layer acts as an intermediary material between the first and second conductive layers. It provides electrical insulation in regions where light blocking is needed, while allowing through holes to pass through for electrical contact, thus mediating between the conflicting requirements of insulation and conductivity.
3Reliability
If the area of first through holes is increased for better electrical contact, then electrical conductivity is improved, but the area available for light blocking is reduced
Solution Approach 1:
The design applies different properties to different regions: the sensing-insulating layer is present in regions where light blocking is prioritized, while through holes are strategically positioned and sized in regions where electrical contact is prioritized. This spatial differentiation optimizes both functions without compromise.
Solution Approach 2:
The patent uses a controlled amount of sensing-insulating material that covers sufficient area to block light effectively, while intentionally leaving gaps (through holes) for electrical contact. The partial coverage strategy ensures adequate light blocking without excessively reducing the area available for electrical conduction.
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 design reduces external light interference, enhancing the visibility and quality of the display by minimizing the visibility of reflection patterns, thus improving user experience.
Implementation Method 1
a sensing-insulating layer between the first conductive layer and the second conductive layer, and defining the first through holes
Implementation Method 2
electrically contacting the first constant voltage electrode layer through first through holes in the non-light-blocking area
Data Source
AI summary
A display device includes a panel layer including a display area, a light-blocking layer above the panel layer, and defining a light-blocking area surrounding at least a portion of the display area, and an input-sensing layer between the panel layer and the light-blocking layer, defining a sensing area, and including a first conductive layer including a first constant voltage electrode layer, at least a portion of which being in a non-light-blocking area between the light-blocking area and the display area, a second conductive layer including a second constant voltage electrode layer, at least a portion of which being in the non-light-blocking area, and electrically contacting the first constant voltage electrode layer through first through holes in the non-light-blocking area, and a sensing-insulating layer between the first conductive layer and the second conductive layer, and defining the first through holes, wherein distances between adjacent first through holes vary.