Display Device Transparent Area Width Variation Diffraction
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Solution Overview
Problem
Self-emission display devices, such as OLEDs, suffer from multiple-image distortion due to diffraction interference caused by the periodic arrangement of transparent areas, which degrades screen quality when pixel areas are in the switch-off state and affects image clarity when in the switch-on state.
Innovation Solution
A display device with a substrate having a transparent area and pixel areas spaced apart, where the width of the transparent area varies along a direction perpendicular to the pixel areas, featuring emission layers with recess and convex portions that break the periodicity of the transparent area, reducing diffraction interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If transparent areas are repeatedly arranged with a constant gap therebetween, then the display device can show images of objects at the opposite side when pixel areas are in the switch-off state, but diffraction interference occurs causing multiple-image distortion
Solution Approach 1:
The patent applies asymmetry by making the width of the transparent area vary along the second direction (vertical direction) instead of maintaining a constant width. Specifically, the transparent area has a first width in a first region and a second width different from the first width in a second region, breaking the periodic symmetry that causes diffraction interference while maintaining the viewing function
2Ease of manufacture
If the width of the transparent area is constant, then the structure is simple and easy to manufacture, but diffraction interference causes multiple-image distortion and deteriorates screen quality
Solution Approach 1:
The patent changes the geometric parameter of the transparent area width along the vertical direction. The width varies from a first width in the first region to a second width in the second region, creating an asymmetric profile that eliminates the periodicity responsible for diffraction interference while maintaining manufacturing feasibility
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 suppresses diffraction interference, preventing multiple-image distortion and enhancing screen quality by eliminating the periodicity of the transparent area, thereby improving image clarity when pixel areas are in the switch-on state.
Implementation Method 1
when the plurality of the pixel areas are in the switch-on state, the pixel areas emit light so that an image (e.g., a predetermined image) can be displayed
Implementation Method 2
light of the object located at the opposite side of the display device passes through the transparent area of the display device
Implementation Method 3
The multi-slit causes diffraction interference of light passing therethrough so that an image of an object located at the opposite side of the display is distorted to multiple images
Data Source
AI summary
A display device includes: i) a substrate member having a transparent area and a plurality of pixel areas, the pixel areas being spaced apart from each other along a first direction and a second direction, the transparent area located between the pixel areas, the second direction being perpendicular to the first direction; and ii) an emission layer located at each of the pixel areas. Among the plurality of pixel areas, a width of the transparent area along the first direction between two pixel areas varies along the second direction. The first direction may be the horizontal direction of a screen realized by the substrate member, the second direction may be a vertical direction, and the emission layer may have a width along the horizontal direction that varies along the vertical direction.