Inclined Light-Emitting Structures for Display Clarity
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Solution Overview
Problem
The existing display devices face a reduction in emitting area and clarity due to dark spots caused by the repair process, particularly in high-resolution displays, where the partial connection between the lower and upper electrodes of the light-emitting structure results in a decreased emitting area and impaired color clarity.
Innovation Solution
The display device incorporates a lower substrate with inclined light-emitting structures, where the first and second light-emitting structures are stacked with respective electrodes and layers, and are slanted in opposite directions, increasing the emission area and viewing angle, and includes a thin film transistor and passivation layers to maintain the emitting area even if one electrode becomes unusable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a repair process is performed to remove contact regions between lower electrode and upper electrode, then connection reliability is improved, but emitting area is reduced
Solution Approach 1:
The light-emitting structure is divided into multiple segments (first light-emitting structure and second light-emitting structure) within a single sub-pixel area. Each segment has its own lower electrode, light-emitting layer, and upper electrode. This segmentation allows the emitting area to be distributed across multiple regions, so that if one segment requires repair or fails, other segments can continue to emit light, thereby maintaining overall emitting area and reliability.
2Manufacturing precision
If emitting area is reduced by repair process, then dark spots are created, but color clarity is decreased
Solution Approach 1:
By segmenting the light-emitting structure into multiple independent segments within each sub-pixel, the patent ensures that repair operations on one segment do not create visible dark spots that affect overall color clarity. The multiple segments distribute the emitting function, so that partial repairs or failures in one segment do not significantly impact the total emitting area or color uniformity.
3Illumination intensity
If light-emitting structures are slanted in opposite directions, then light focusing and visibility are improved, but structural complexity is increased
Solution Approach 1:
The patent employs asymmetric slanting of light-emitting structures where the first light-emitting structure slants in one direction and the second light-emitting structure slants in the opposite direction. This asymmetric configuration optimizes light extraction and focusing characteristics, improving visibility and perceived brightness. The slanting angles are specifically designed to direct light toward the viewer, enhancing display quality while managing structural complexity through systematic design.
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 enhances visibility and emission efficiency by focusing light and maintaining the emitting area, preventing reduction due to repair process-related dark spots, thus ensuring improved clarity and efficiency.
Implementation Method 1
a light-emitting layer, and an upper electrode, which are sequentially stacked
Data Source
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AI summary
A display device including two light-emitting structures on a single sub-pixel area is provided. In the display device, the two light-emitting structures are inclined toward the center of the corresponding sub-pixel area.