Touch Electrode Layout for Uniform Side Visibility in Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face issues with varying side visibility due to differences in the width of the pixel defining layer, leading to uneven light occlusion and color changes at different viewing angles.
Innovation Solution
The display device incorporates a first insulating layer with varying thickness proportional to the width of the pixel defining layer, a protective layer with a higher refractive index, and a second touch electrode positioned at varying heights to minimize light occlusion and enhance side visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pixel defining layer has varying width across different regions, then the display can accommodate different emission area sizes, but side visibility deteriorates due to uneven light occlusion and color changes at different viewing angles
Solution Approach 1:
The patent applies local quality by making the first insulating layer have different thicknesses in different regions. Specifically, the insulating layer thickness is increased in regions where the pixel defining layer is wider, so that the second touch electrode is positioned higher relative to the emission area. This local variation in insulating layer thickness compensates for the varying width of the pixel defining layer, maintaining uniform light occlusion and consistent color output across all viewing angles while accommodating different emission area sizes.
2Device complexity
If the touch electrode is positioned at a fixed height, then the structure is simple, but light occlusion varies at different viewing angles causing color changes
Solution Approach 1:
The patent applies dynamics by making the effective height of the second touch electrode variable rather than fixed. The first insulating layer has different thicknesses in different regions, which dynamically adjusts the vertical position of the second touch electrode relative to the emission area. This dynamic positioning compensates for viewing angle changes and maintains consistent light occlusion, preventing color shifts while adding controlled structural complexity.
3Ease of manufacture
If the insulating layer has uniform thickness, then manufacturing is easier, but the second touch electrode cannot compensate for varying pixel defining layer widths
Solution Approach 1:
The patent applies local quality to the insulating layer by designing it with non-uniform thickness. The insulating layer is thicker in regions where the pixel defining layer is wider, allowing the second touch electrode to be positioned higher. This local variation in thickness compensates for the varying pixel defining layer widths, ensuring uniform side visibility across the display while maintaining compatibility with standard manufacturing processes.
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 improves side visibility by reducing light occlusion and maintaining consistent color output across different viewing angles, enhancing the overall display performance.
Implementation Method 1
A refractive index of the protective layer may be higher than a refractive index of the first insulating layer
Data Source
AI summary
Provided are a display device and an electronic device including the same. The display device includes a substrate, a light-emitting element layer disposed on the substrate, the light-emitting element layer including a plurality of emission areas and a pixel defining layer defining the plurality of emission areas, a first touch electrode disposed on the light-emitting element layer to overlap the pixel defining layer, a first insulating layer disposed on the first touch electrode and the light-emitting element layer, and a second touch electrode disposed on the first insulating layer to overlap the pixel defining layer. A distance between one surface of the substrate and the second touch electrode varies depending on a width of the pixel defining layer on which the second touch electrode is disposed.