Display 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 pixel areas due to non-uniform alignment of light emitting elements, necessitating a solution to align elements in a target area for consistent light intensity.
Innovation Solution
A display device design featuring a substrate with aligned sub-electrodes and branch electrodes, via holes, and insulating layers to position light emitting elements uniformly, along with a method of fabrication that includes forming electrodes and insulating layers to achieve precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light emitting elements are not aligned in a target area, then the device structure is simpler and manufacturing is easier, but the light emission distribution becomes non-uniform across the emission area
Solution Approach 1:
The electrode structure is segmented into sub-electrodes and branch electrodes that are spatially separated and independently arranged. The sub-electrodes are positioned at first locations while branch electrodes are positioned at second locations, creating distinct functional zones that guide light emitting element alignment without requiring complex integrated structures.
Solution Approach 2:
The patent introduces a vertical dimension to electrode arrangement by stacking insulating layers between sub-electrodes and branch electrodes. This multi-layer configuration allows electrodes to be aligned in specific target areas of the emission area without increasing planar complexity, achieving precise spatial positioning through three-dimensional arrangement.
2Manufacturing precision
If electrodes are arranged to align light emitting elements in target areas, then uniform light emission distribution is achieved, but the manufacturing process becomes more complex
Solution Approach 1:
Insulating layers are formed in advance between sub-electrodes and branch electrodes, establishing predetermined alignment structures before light emitting elements are positioned. This preliminary arrangement of insulating layers creates ready-made alignment guides that simplify the subsequent placement and alignment of light emitting elements in target areas.
Solution Approach 2:
Insulating layers serve as intermediary structures that mediate between the electrode arrangement and light emitting element positioning. These layers provide physical separation, electrical insulation, and alignment guidance, enabling uniform light emission distribution without requiring direct complex interactions between electrodes and light emitting elements.
3Illumination intensity
If light emitting elements are aligned only in target areas, then emission uniformity improves, but the area available for electrode connection is reduced
Solution Approach 1:
The electrode system is divided into sub-electrodes for light emitting element connection and branch electrodes for signal routing, with insulating layers separating their functional zones. This segmentation allows alignment-focused target areas to be distinct from connection areas, preventing interference between alignment requirements and connection space requirements.
Solution Approach 2:
The patent utilizes vertical stacking of insulating layers to separate sub-electrodes and branch electrodes in the third dimension. This allows both electrode types to coexist without competing for planar space, maintaining sufficient area for connections while creating defined target areas for light emitting element alignment through vertical spatial organization.
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 1E~1F
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 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 sub-electrode and the branch electrode; first electrodes disposed on the first insulating layer and electrically connected with the sub-electrode; second electrodes disposed on the first insulating layer and electrically connected with the 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.