Pixel Electrode Layout for Efficient Micro-LED Light Emission
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Solution Overview
Problem
Existing display devices face challenges in efficiently utilizing subminiature light emitting elements due to electrode configurations that do not optimize light emission from pixels.
Innovation Solution
The display device incorporates a specific electrode arrangement where first, second, and third electrodes are spaced apart by a distance equal to or less than the length of the light emitting elements, with the electrodes extending in different directions and having symmetrical shapes to enhance light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional electrode configurations are used, then device complexity is reduced, but light emission efficiency deteriorates
Solution Approach 1:
The first electrode is divided into three separate electrode parts (first, second, and third electrode parts) that are spaced apart from the second electrode. Each electrode part independently contacts light emitting elements, creating multiple light emission regions within a single pixel. This segmentation enables enhanced light emission efficiency by utilizing subminiature light emitting elements more effectively, while the modular structure keeps the configuration manageable.
2Illumination intensity
If electrode spacing is increased to accommodate multiple light emitting elements, then light emission efficiency improves, but pixel area increases
Solution Approach 1:
The electrode parts are arranged in a spatial configuration where they extend in different directions (first direction for first and second electrode parts, second direction for third electrode part). This multi-dimensional arrangement allows multiple light emitting elements to be positioned within a compact pixel area while maintaining adequate spacing for efficient light emission. The third electrode part crossing the first direction creates a cross-shaped pattern that maximizes space utilization.
3Illumination intensity
If symmetrical electrode shapes are used, then light emission uniformity improves, but manufacturing precision requirements increase
Solution Approach 1:
While the electrode parts have symmetrical relationships with each other (first and second electrode parts are symmetrical with the second electrode), the overall configuration accepts natural variations in light emitting element positions and orientations. The design does not require perfect symmetrical precision, allowing for practical manufacturing tolerances while still achieving uniform light emission through the balanced spatial arrangement of the electrode parts.
Data Source
Figure 1A~2B
Figure 3A~3B
Figure 4
AI summary
A display device includes a plurality of pixels including emission areas, respectively, and a bank disposed between the emission areas of the pixels to enclose each of the emission areas. Each pixel includes a first electrode and a second electrode that are disposed in the emission area to be spaced apart from each other, and a plurality of light emitting elements that are electrically connected between the first and second electrodes. The first electrode includes a first electrode part disposed in the emission area to be adjacent to a first side of the second electrode, a second electrode part disposed in the emission area to be adjacent to a second side of the second electrode, and a third electrode part configured to connect the first and second electrode parts between the first and second electrode parts, and disposed in the emission area to be adjacent to a third side of the second electrode.