Tiled Display Pixel Electrode Layout for Viewing-Angle Color Purity
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Solution Overview
Problem
Display devices experience color mixing issues when viewed from different angles, resulting in unwanted color shifts such as bluish or reddish tones, particularly when displaying full white images.
Innovation Solution
A display device with a pixel configuration that includes three light emitting elements arranged at equal distances along a direction, each with a semiconductor layer and active layer, and specific electrode arrangements to ensure uniform light output across viewing angles, preventing color mix by swapping and disposing pixel electrodes among sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting elements are arranged in a conventional pixel structure, then the display device can emit light in different colors, but color mixing occurs when viewed from different angles
Solution Approach 1:
The patent applies asymmetry by arranging pixel electrodes and light emitting elements in a non-uniform, alternating pattern. Specifically, first pixel electrodes contact first and third light emitting elements while second pixel electrodes contact second light emitting elements, creating an asymmetric configuration that compensates for viewing angle-dependent color mixing. This asymmetric arrangement ensures that color accuracy is maintained across different viewing angles.
Solution Approach 2:
The patent implements local quality by making different parts of the pixel structure have different arrangements. The first and second pixel electrodes are arranged differently relative to the light emitting elements, with specific contact patterns that optimize local light extraction and color emission characteristics for each region, thereby preventing overall color mixing when viewed from angled positions.
2Reliability
If pixel electrodes are arranged to contact light emitting elements, then electrical connection is established, but color mixing occurs due to viewing angle dependence
Solution Approach 1:
The asymmetric arrangement of pixel electrodes relative to light emitting elements serves dual purposes: maintaining reliable electrical connection while preventing color mixing. The alternating contact pattern ensures that each pixel electrode type connects to specific light emitting elements in a non-uniform distribution, which electrically connects the structure reliably while optically preventing color mixing from angled views.
3Ease of manufacture
If conventional pixel structures are used, then manufacturing is simplified, but color mixing occurs at oblique viewing angles
Solution Approach 1:
The asymmetric pixel structure, while more complex than conventional symmetric designs, maintains ease of manufacture by using regular alternating patterns that can be fabricated using standard semiconductor manufacturing processes. The alternating arrangement of first and second pixel electrodes with specific contact patterns to light emitting elements creates a manufacturable asymmetric structure that prevents color mixing.
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 ensures uniform light output in all directions, effectively preventing color mixing and maintaining accurate color representation regardless of the viewing angle.
Implementation Method 1
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
Data Source
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AI summary
A display device includes a pixel. The pixel includes 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.