Display Pixel Electrode Layout for Uniform Light Emission
Find Innovative SolutionsGenerate Solutions
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, where light emitting elements are aligned between first and second electrodes using alignment voltage, with varying insulating layer thicknesses to ensure precise positioning and uniform emission, and a method for fabricating this structure involving the formation of via holes and contact electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If light emitting elements are randomly distributed in the emission area, then the device complexity is reduced, but the uniformity of light emission distribution deteriorates
Solution Approach 1:
The emission area is divided into multiple pixel regions, and each pixel is further segmented into sub-electrode areas and branch electrode areas. Light emitting elements are specifically positioned in the branch electrode areas, creating a segmented distribution pattern that ensures uniform light emission while maintaining manageable device complexity through systematic organization.
Solution Approach 2:
Different regions of the pixel are assigned different functions: sub-electrode areas for electrical connection and branch electrode areas for light emitting element placement. This local differentiation ensures that light emitting elements are concentrated in specific areas (branch electrodes) rather than uniformly distributed, achieving uniform overall emission through localized positioning.
2Stability of the object's composition
If light emitting elements are aligned in a specific pattern, then the uniformity of light emission distribution is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The sub-electrodes and branch electrodes are pre-formed with specific geometries and positions before light emitting element placement. The branch electrodes extend from the sub-electrodes and create natural positioning sites, allowing light emitting elements to be aligned along these pre-established conductive paths, thereby reducing alignment precision requirements.
Solution Approach 2:
The branch electrodes serve as intermediary structures that mediate between the sub-electrodes and the light emitting elements. They provide extended conductive paths that facilitate the alignment and electrical connection of light emitting elements, reducing the direct precision requirements between sub-electrodes and light emitting elements.
3Ease of manufacture
If the insulating layer thickness is uniform, then the manufacturing process is simplified, but the positioning precision of light emitting elements deteriorates
Solution Approach 1:
The insulating layer thickness is varied locally: it is thinner in the branch electrode areas where light emitting elements are positioned, and thicker in other areas. This local thickness variation provides precise positioning control for light emitting elements while the overall fabrication process remains manageable through systematic pattern formation.
Solution Approach 2:
The insulating layer thickness is controlled in the vertical dimension to achieve horizontal positioning precision. By varying the thickness of the insulating layer in the vertical dimension, the patent achieves precise lateral positioning of light emitting elements on the pixel surface, adding a dimensional control mechanism.
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.