Concavo-Convex Unit Pixel Substrate for Uniform RGB Viewing
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Solution Overview
Problem
Conventional micro LED displays face challenges in achieving uniform viewing angles for light emitted from sub-pixels, leading to color variations when viewed from different angles due to differing viewing angles of red, green, and blue light, which affects the quality of displayed images.
Innovation Solution
A unit pixel design featuring a transparent substrate with a concavo-convex pattern on its surface, where light emitting devices are arranged and an optical layer is disposed between the devices and the substrate to enhance light extraction efficiency and uniformity of viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional micro LED displays are used, then light emitting devices can be arranged to form pixels, but the viewing angles of light emitted from sub-pixels are not uniform, leading to color variations when viewed from different angles
Solution Approach 1:
The patent applies local quality by introducing a concavo-convex pattern specifically on the transparent substrate surface facing the light emitting devices. This localized structural modification creates different refraction angles for light passing through convex and concave regions, thereby adjusting the viewing angles of individual sub-pixels to achieve uniformity across red, green, and blue light sources without altering the overall display structure.
Solution Approach 2:
The patent changes the physical parameter of the substrate surface from flat to concavo-convex, thereby modifying the optical path and refraction characteristics of light. This parameter change in substrate morphology directly influences the viewing angle characteristics of emitted light, enabling uniform viewing angles and consistent color representation across different viewing positions.
2Loss of energy
If a flat transparent substrate is used, then the structure is simple, but light extraction efficiency is limited and viewing angles are not uniform
Solution Approach 1:
The patent employs curvature by creating a concavo-convex pattern on the transparent substrate surface. The convex and concave regions act as micro-lens structures that bend and redirect light paths, increasing light extraction efficiency by reducing total internal reflection at the substrate interface. This curved surface structure also enables uniform viewing angles by distributing light more evenly across different emission angles.
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 concavo-convex pattern on the transparent substrate ensures substantially uniform viewing angles for light emitted from the unit pixel, reducing color differences when viewed from various angles and improving the overall image quality by increasing light extraction efficiency and adjusting the viewing angles of light emitted from the light emitting devices.
Implementation Method 1
the transparent substrate has a concavo-convex pattern on a surface facing the light emitting devices
Implementation Method 2
an optical layer disposed between the light emitting devices and the transparent substrate, and transmitting light emitted from the light emitting devices
Data Source
AI summary
A unit pixel includes a transparent substrate, a plurality of light emitting devices arranged on the transparent substrate, and an optical layer disposed between the light emitting devices and the transparent substrate and transmitting light emitted from the light emitting devices. The transparent substrate has a concavo-convex pattern on a surface facing the light emitting devices.