Micro-LED Pixel Layout for Uniform Viewing-Angle Color
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Solution Overview
Problem
Micro-LED display devices experience dispersion phenomena and color differences at different viewing angles due to varying light-emitting angles of red, green, and blue micro-LEDs, which are horizontally arranged on a two-dimensional plane, leading to inconsistent color display.
Innovation Solution
Arranging multiple micro-LEDs with different light-emitting wavelengths on a circumferential line with a common center and radius, aligning their light-emitting surfaces to rotate around a preset axis, and using an optical component to ensure all lights enter and exit at the same angle, thereby minimizing dispersion and color differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If red, green and blue micro-LEDs are horizontally arranged on a two-dimensional plane according to a predetermined linear direction, then the device structure is simple and easy to manufacture, but the light-emitting angles of the three micro-LEDs are different causing dispersion phenomenon and color difference at different viewing angles
Solution Approach 1:
The patent transitions from a two-dimensional linear arrangement to a three-dimensional configuration by tilting the micro-LEDs at specific angles (e.g., 45 degrees) relative to the substrate plane. This dimensional change allows all micro-LEDs to direct their light emissions toward a common exit point, ensuring consistent light-emitting angles across different colors while maintaining manufacturing feasibility through standardized mounting structures.
Solution Approach 2:
The patent employs asymmetric arrangement of micro-LEDs with different tilt angles and orientations tailored to each micro-LED's position and color. Instead of uniform horizontal placement, each micro-LED is positioned and angled specifically to direct light through optical components to a common exit point, creating an asymmetric configuration that resolves the light-emitting angle inconsistency problem.
2Manufacturing precision
If an optical component is added to reduce the light-emitting angle, then the light-emitting angle control is improved, but the device complexity increases and the dispersion phenomenon persists due to different initial light-emitting angles
Solution Approach 1:
The patent applies preliminary action by pre-positioning and pre-angling the micro-LEDs during the manufacturing stage so that their light emissions are already aligned toward the optical components' entry points. This preliminary angular alignment ensures that when light passes through the optical components, all colors converge at the same exit point, eliminating dispersion without requiring complex optical adjustment mechanisms.
3Productivity
If the spacing between micro-LEDs is reduced to achieve smaller pixel size, then the display resolution is improved, but the light-emitting angle differences become more pronounced causing worse dispersion
Solution Approach 1:
The patent applies local quality by customizing the tilt angle and orientation of each individual micro-LED based on its specific position within the pixel unit. Micro-LEDs at different locations and colors are assigned different angular parameters tailored to their local geometry, ensuring that despite reduced spacing, each micro-LED's light path is precisely directed to the common exit point, maintaining angle consistency at higher resolutions.
Data Source
AI summary
Provided are an LED pixel unit, a display panel and a display screen. The LED pixel unit includes: micro-LEDs, arranged on a circumferential line with a point A as a center and R as a radius; the micro-LEDs are provided with light-emitting surfaces with a same orientation, emitting lights of the micro-LEDs are capable of rotating around a preset axis by a predetermined angle and then coinciding with each other, and the preset axis passes through the point A and is perpendicular to a plane where the circumferential line is located; and an optical component, arranged to face toward the light-emitting surfaces of the micro-LEDs and have a preset distance with respect to the light-emitting surfaces, and the optical component is configured to receive the emitting lights, and enable the emitting lights to emit from the optical component at a preset light-emitting angle.