Sensing Electrode Asymmetry Reduces White Angular Dependency
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Solution Overview
Problem
Display devices face challenges in maintaining optimal display quality due to optical phenomena such as resonance and interference, which affect the color accuracy of images, particularly noticeable in white images as they shift color depending on the viewing angle, known as white angular dependency (WAD).
Innovation Solution
The implementation of a display device with a specific arrangement of color light emitting areas and an input sensor, where the sensing electrode is designed with distinct line areas and openings to optimize the distance and line width configurations, combined with an optical film including polarizing and retarder films, to minimize the impact of optical phenomena on image color coordinates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional input sensor structure is used, then the device complexity is low, but white angular dependency occurs causing color shifts in displayed images
Solution Approach 1:
The sensing electrode is segmented into multiple line areas (first, second, third, and fourth line areas) with different widths and positions relative to color light emitting areas. This segmentation allows selective shielding of light in different directions, reducing white angular dependency by compensating for color shifts from different viewing angles through asymmetric line area configurations.
Solution Approach 2:
Different line areas of the sensing electrode are designed with different local properties (different widths, positions, and orientations). The first line area has a greater width than the second line area, and they are positioned asymmetrically relative to the color light emitting areas. This local quality variation enables directional light shielding that specifically addresses white angular dependency while maintaining touch sensitivity.
2Object-affected harmful factors
If the sensing electrode line areas are made wider to improve light shielding, then white angular dependency is reduced, but the area available for light emission decreases
Solution Approach 1:
The light shielding function is achieved not by increasing the area in the planar dimension, but by utilizing the dimensional properties of line areas with different widths and orientations. The first line area extends in a first direction with a greater width, while the second line area extends in a second direction with a smaller width, creating asymmetric light shielding in different viewing directions without significantly reducing the overall light emitting area.
Solution Approach 2:
The sensing electrode employs asymmetric line area configurations where the first line area has a greater width than the second line area, and they are positioned differently relative to the color light emitting areas. This asymmetry creates directional light shielding that preferentially blocks light from specific viewing angles, reducing white angular dependency while preserving most of the light emitting area for normal operation.
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
This configuration significantly reduces white angular dependency, ensuring consistent color representation across different viewing angles and improving overall display quality by effectively shielding and directing light to reduce color shifts in white images.
Implementation Method 1
an optical film including polarizing and retarder films
Implementation Method 2
an optical film including polarizing and retarder films
Implementation Method 3
effectively shielding and directing light to reduce color shifts
Data Source
AI summary
A display panel includes first, second, and third color light emitting areas and a non-light emitting area disposed among the first, second, and third color light emitting areas. First, second, and third openings corresponding to the first, second, and third color light emitting areas are defined in an input sensor. A sensing electrode includes a first line area and a second line area facing each other in a first direction around each of the first, second, and third openings and a third line area and a fourth line area facing each other in a second direction intersecting the first direction. A distance between the first color light emitting area and the first line area is less than a distance between the second and third color light emitting areas and the first line area.