Parallel Sub-Pixel Layout to Prevent Display Dark Spots
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Solution Overview
Problem
Display devices suffer from image distortion and dark spots due to defects in individual light emitting elements within sub-pixels, leading to impaired functionality.
Innovation Solution
A display device design featuring a cathode electrode with a mesh structure and parallel-connected first and second light emitting elements oriented diagonally, allowing for continued functionality even if one element fails, with a bank exposing both elements and shared cathode electrodes for adjacent rows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single light emitting element is used in each sub-pixel, then the device structure is simple, but the display reliability deteriorates when a defect occurs
Solution Approach 1:
Each sub-pixel is divided into multiple light emitting elements (first light emitting element and second light emitting element) that are spatially separated and electrically connected in parallel. This segmentation allows the sub-pixel to maintain functionality even when one element is defective, thereby improving display reliability without significantly increasing overall device complexity.
Solution Approach 2:
The patent implements a redundant light emitting element configuration where a second light emitting element is prepared in advance within each sub-pixel. This beforehand cushioning ensures that if the first light emitting element fails, the second element can compensate and maintain normal display operation, preventing dark spots and image distortion before they occur.
2Reliability
If multiple light emitting elements are connected in parallel, then the reliability improves, but the manufacturing complexity increases
Solution Approach 1:
The patent merges the functionality of multiple light emitting elements within a single sub-pixel structure, sharing common electrodes (anode and cathode) and control circuitry. This merging approach allows parallel connection of multiple elements while maintaining relatively simple manufacturing processes compared to completely independent element structures.
Solution Approach 2:
The cathode electrode structure is designed with multi-functionality, serving as a common electrode for both the first and second light emitting elements. This universal electrode design simplifies the manufacturing process by reducing the number of separate electrode structures needed, while still enabling reliable parallel operation of multiple elements.
3Reliability
If light emitting elements are spaced apart diagonally, then the compensation effectiveness improves, but the area occupied increases
Solution Approach 1:
The patent employs asymmetric spatial arrangement where the first and second light emitting elements are positioned at different locations within the sub-pixel and oriented diagonally relative to each other. This asymmetric placement optimizes the compensation effectiveness by ensuring that at least one element remains visible and functional from various viewing angles, while carefully managing the area occupation within the sub-pixel boundaries.
Data Source
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.