Display Pixel Redundancy Using Diagonal Parallel Light Emitters
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Solution Overview
Problem
Display devices suffer from defects in light emitting elements of sub-pixels, leading to dark spots or distorted colors, which affect the overall image quality.
Innovation Solution
A display device design featuring a pixel circuit layer with an anode and cathode electrode, and two light emitting elements connected in parallel, diagonally spaced and oriented at an angle greater than 0° and less than 90°, with a mesh structured cathode electrode and bank openings exposing the elements, allowing for redundancy in case of defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single light emitting element is used in each sub-pixel, then the device complexity is low, but the reliability deteriorates when defects occur
Solution Approach 1:
The sub-pixel is divided into multiple independent light emitting elements (first and second light emitting elements) that can operate independently. Each element has its own emission area and can function separately, so if one element fails, the other can still maintain display functionality in that sub-pixel.
Solution Approach 2:
The patent incorporates redundant light emitting elements in advance to compensate for potential defects. By having multiple elements in each sub-pixel from the beginning, the system is prepared to handle failures without requiring corrective measures or reducing functionality.
2Reliability
If multiple light emitting elements are added to each sub-pixel for redundancy, then the reliability improves, but the manufacturing precision requirements increase
Solution Approach 1:
Multiple light emitting elements are combined within a single sub-pixel structure and share common electrode connections (anode and cathode electrodes). This merging approach allows the elements to be controlled as part of the same circuit unit, reducing the complexity of individual element control and facilitating more tolerant manufacturing processes.
Solution Approach 2:
The electrode structures and pixel circuit designs are configured to support multiple light emitting elements universally. The same electrode patterns and circuit connections can drive different combinations of elements, providing flexibility that accommodates manufacturing variations without requiring precision alignment for each specific element configuration.
3Illumination intensity
If light emitting elements are arranged diagonally with specific angle constraints, then the image quality and color distribution improve, but the device complexity increases
Solution Approach 1:
The light emitting elements are arranged in asymmetric diagonal positions rather than symmetric horizontal or vertical alignments. This asymmetric configuration creates distinct emission areas that optimize color distribution and prevent overlapping light paths, improving color uniformity while maintaining a relatively simple structural configuration.
Data Source
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AI summary
A display device includes a pixel circuit layer disposed on a substrate; an anode electrode disposed on the pixel circuit layer; a cathode electrode disposed on the pixel circuit layer and spaced apart from the anode electrode; and a first light emitting element and a second light emitting element electrically connected in parallel between the anode electrode and the cathode electrode. The first light emitting element and the second light emitting element may be spaced apart from each other in a second direction and oriented diagonally.