Micro LED Pixel Electrode Layout for Wide-Angle Color Consistency
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Solution Overview
Problem
Display devices experience color mix issues when viewed from different angles, leading to undesirable color shifts such as bluish or reddish tinting.
Innovation Solution
A display device design featuring specific arrangements and configurations of light emitting elements and pixel electrodes, including flip-chip type micro LEDs, with varying distances and electrode orientations to ensure uniform light output across viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional display devices are viewed from different angles, then color mix occurs causing bluish or reddish tinting, but the display structure and materials are conventional without special angle compensation
Solution Approach 1:
The patent applies asymmetry by arranging pixel electrodes and light emitting elements in non-uniform patterns. Specifically, the pixel electrodes are positioned at different distances from the light emitting elements, and the electrode arrangement varies in different regions of the display. This asymmetric configuration compensates for viewing angle effects, preventing color mix when viewed from oblique angles while maintaining color consistency across the display.
2Ease of manufacture
If pixel electrodes are arranged uniformly, then manufacturing is simple, but color mix occurs at oblique viewing angles
Solution Approach 1:
The patent implements local quality by varying the electrode arrangement and spacing in different local regions of the display. The pixel electrodes are positioned at different distances from light emitting elements depending on their location, with specific spacing configurations in different areas. This localized variation optimizes color consistency for oblique viewing angles in each region while maintaining overall manufacturing feasibility through systematic patterning.
3Device complexity
If light emitting elements are arranged at equal distances, then the structure is symmetric and simple, but color mix occurs when viewed from the side
Solution Approach 1:
The patent breaks the symmetric equal-distance arrangement by positioning light emitting elements and pixel electrodes at varied distances from each other. The asymmetric configuration includes different spacing intervals in different regions, which compensates for the optical path differences caused by oblique viewing angles. This prevents color mix while maintaining a relatively simple overall structure that can be manufactured using standard 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
Prevents or alleviates color mix by ensuring consistent light emission across different viewing angles, enhancing display quality and reducing angle-dependent color shifts.
Implementation Method 1
Each of the first to third light emitting elements includes a first semiconductor layer, a second semiconductor layer, and an active layer between the first semiconductor layer and the second semiconductor layer
Data Source
AI summary
A display device includes a pixel including a first light emitting element, a second light emitting element, and a third light emitting element that are arranged at equal distances from each other along a first direction, first pixel electrodes arranged along the first direction and contacting the first to third light emitting elements, and second pixel electrodes paired with the first pixel electrodes, arranged along the first direction, and contacting the first to third light emitting elements. Each of the first to third light emitting elements includes a first semiconductor layer, a second semiconductor layer, and an active layer between the first semiconductor layer and the second semiconductor layer, and includes a mesa area in which one of the first and second semiconductor layers is partially exposed by another thereof. The mesa area of the first light emitting element is in contact with one of the first pixel electrodes.