Pixel Electrode Layout for Uniform Light Output in Displays
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Solution Overview
Problem
Existing display devices face challenges in achieving uniform light output distribution due to the fixed alignment of light emitting elements, which can lead to concentrated light emission in specific directions, affecting image quality.
Innovation Solution
A display device design that includes a substrate with a display area and non-display area, featuring pixels with a pixel circuit layer and a display element layer. The display element layer comprises light emitting elements electrically connected to first and second electrodes, where the electrodes have varying widths and shapes to allow light emitting elements to be aligned in various directions, ensuring uniform light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light emitting elements are aligned in a fixed direction, then the alignment process is simple, but light output distribution becomes non-uniform
Solution Approach 1:
The patent employs asymmetric electrode configurations where the first and second electrodes have different widths and shapes. This asymmetry creates varied electric field distributions that guide light emitting elements to align in multiple directions rather than a single fixed direction, thereby achieving uniform light output distribution across the display device while maintaining manufacturing simplicity through a systematic design approach.
2Illumination intensity
If electrodes have varying widths and shapes, then light emitting elements can be aligned in various directions, but electrode design complexity increases
Solution Approach 1:
The patent divides the electrode structure into multiple segments with different widths and shapes (first electrodes and second electrodes with varying dimensions). This segmentation allows each electrode segment to serve a specific function in guiding light emitting elements along different alignment paths, achieving multi-directional alignment while managing design complexity through modular segmentation rather than a single complex electrode design.
3Illumination intensity
If light emitting elements are aligned in multiple directions, then light output distribution becomes uniform, but the alignment control becomes more difficult
Solution Approach 1:
The patent implements local quality variations in the electrode design where different regions have electrodes with specific width and shape characteristics tailored to guide light emitting elements in appropriate directions. This localized optimization simplifies alignment control by creating natural guidance zones rather than requiring complex global control mechanisms, as each local region independently promotes alignment in its designated direction.
Data Source
AI summary
A display device includes a substrate including a display area and a non-display area; and at least one pixel provided in the display area, and including a pixel circuit layer. The display element layer includes at least one transistor, and a display element layer including at least one light emitting element emitting light, and a first electrode and a second electrode spaced apart from each other, disposed on the substrate, and each extending in a first direction, and the at least one light emitting element is electrically connected to each of the first and the second electrodes. The first electrode has at least two widths in an extension direction of the first electrode. The second electrode has at least two widths in an extension direction of the second electrode.