Pixel Electrode Layout for Uniform Light Emission Alignment
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Solution Overview
Problem
Existing display devices face challenges in achieving uniform light emission distribution across pixels due to non-uniform alignment of light emitting elements, leading to inconsistent luminance and efficiency.
Innovation Solution
A display device design featuring a substrate with sub-electrodes and branch electrodes, insulating layers, and contact electrodes that align light emitting elements between specific electrodes, allowing for precise alignment and uniform emission distribution through the application of alignment voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light emitting elements are not precisely aligned, then manufacturing process is simpler, but light emission distribution becomes non-uniform
Solution Approach 1:
The electrode structure is segmented into sub-electrodes and branch electrodes that are spatially separated and independently configured. This segmentation allows for precise alignment control of light emitting elements without requiring a single complex electrode structure, thereby resolving the contradiction between alignment precision and device complexity.
Solution Approach 2:
The patent introduces a vertical dimension to the electrode structure by stacking sub-electrodes and branch electrodes at different heights, connected through insulating layers with via holes. This dimensional change enables precise alignment control in three-dimensional space, achieving uniform light emission without overly complicating the manufacturing process.
2Area of stationary object
If electrode area is reduced to improve display density, then space efficiency improves, but alignment control of light emitting elements becomes more difficult
Solution Approach 1:
By dividing the electrode into multiple small sub-electrodes and branch electrodes rather than using a single large electrode, the patent achieves both reduced overall electrode area and improved alignment control. Each small electrode can be precisely positioned to guide light emitting element alignment while occupying minimal space.
Solution Approach 2:
The electrode structure implements local quality by creating specific alignment regions through sub-electrodes and branch electrodes at different locations. Each local region has optimized electrode configuration for precise alignment control, while the overall electrode area remains reduced for high display density.
3Illumination intensity
If light emitting elements are not uniformly aligned in target area, then device structure is simpler, but emission uniformity deteriorates
Solution Approach 1:
The insulating layer structure utilizes vertical stacking with via holes to create three-dimensional alignment pathways. This dimensional approach enables uniform light emission by precisely positioning electrodes in space without requiring overly complex planar structures, resolving the contradiction between emission uniformity and device complexity.
Data Source
AI summary
A display device may include: a substrate including a display area and a non-display area; and at least one pixel disposed in the display area, and comprising at least one pixel including an emission area that emits light. The at least one pixel may include: at least one sub-electrode extending in a direction on the substrate; at least one branch electrode extending in a direction and spaced apart from the sub-electrode; a first insulating layer disposed on the at least one sub-electrode and the at least one branch electrode; first electrodes disposed on the first insulating layer and electrically connected with the at least one sub-electrode; second electrodes disposed on the first insulating layer and electrically connected with the at least one branch electrode; and at least one light emitting element aligned between at least one of the first electrodes and at least one of the second electrodes.