Horizontal LED Pixel Layout for Wide-Angle Color Uniformity
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Solution Overview
Problem
Display devices using horizontal LEDs suffer from color distortion due to structural asymmetry, leading to uneven brightness changes when viewed from different angles.
Innovation Solution
The display device incorporates a combination of first and second pixels, where each pixel includes light-emitting diodes with specific semiconductor layer configurations and electrode arrangements. The first pixel has mesa regions oriented in opposite directions relative to the overlap regions, while the second pixel has all mesa regions aligned in the same direction as the overlap regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If horizontal LEDs with two electrodes at the same side are used, then device complexity is reduced and ease of manufacture is improved, but color distortion occurs under different angles of view due to structural asymmetry
Solution Approach 1:
The patent applies asymmetry by intentionally introducing a compensation mesa structure that is asymmetric relative to the light-emitting layer. This compensation mesa is positioned on one side of the overlap region to counterbalance the inherent asymmetry of the horizontal LED structure, thereby compensating for the directional brightness variation and reducing color distortion when viewed from different angles.
2Object-affected harmful factors
If mesa regions are positioned in specific directions relative to overlap regions, then color distortion is reduced, but device complexity increases
Solution Approach 1:
The patent applies local quality by creating a localized compensation mesa structure only in specific regions where asymmetry compensation is needed. Rather than redesigning the entire LED structure, the compensation mesa is selectively positioned in the overlap region or adjacent areas to locally counterbalance the brightness variation in those specific zones, thereby reducing color distortion without significantly increasing overall device complexity.
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 alleviates the issue of uneven brightness changes and color distortion across different angles of view, resulting in more consistent color performance and reduced color shift.
Implementation Method 1
Light-emitting diode (LED) technique is widely used in a variety of display devices
Implementation Method 2
Each of the first light-emitting diodes includes a first bottom semiconductor layer and a first top semiconductor layer stacked along a vertical direction
Data Source
AI summary
A display device includes a first pixel and a second pixel. The first pixel includes first light-emitting diodes. Each first light-emitting diode includes a first bottom semiconductor layer and a first top semiconductor layer stacked along a vertical direction. The second pixel includes second light-emitting diodes. Each second light-emitting diode includes a second bottom semiconductor layer and a second top semiconductor layer stacked along the vertical direction. In one of the first light-emitting diodes of the first pixel, a first mesa region is located in a first direction of a first overlap region, and in another of the first light-emitting diodes of the first pixel, the first mesa region is located in a second direction opposite to the first direction of the first overlap region. In each second light-emitting diode of the second pixel, a second mesa region is located in the second direction of a second overlap region.