Display Device Vertical Contact Structure for Light Emission Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current display devices face challenges in securing sufficient space for light emitting elements, which can lead to inefficiencies in light emission and potential short circuits due to the dense arrangement of these elements.
Innovation Solution
The proposed display device incorporates a design with a pixel circuit layer and a display element layer, featuring a network of contact parts that connect the anode and cathode electrodes to the light emitting elements, ensuring these elements are aligned and spaced to prevent overlap with emission areas, thus securing the area for light emission and preventing short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If light emitting elements are densely arranged to increase display resolution, then the quantity of sub-pixels increases, but the area available for light emission decreases and short circuits may occur
Solution Approach 1:
The patent transitions from planar arrangement to three-dimensional stacked arrangement of contact parts. Multiple contact parts are positioned at different vertical levels (first contact part connecting anode, second contact part connecting cathode) to connect light emitting elements in the thickness direction, enabling dense packing without increasing lateral footprint and preventing short circuits through vertical separation.
Solution Approach 2:
The contact structure is divided into functionally independent first and second contact parts positioned at different locations. The first contact part connects the anode electrode while the second contact part connects the cathode electrode, allowing independent optimization of each contact's position to avoid overlap with emission areas and prevent short circuits.
2Reliability
If contact parts are positioned to connect electrodes, then electrical connectivity is achieved, but overlap with emission areas may cause short circuits
Solution Approach 1:
Contact parts are arranged in the thickness direction rather than lateral plane, using vertical stacking to achieve electrical connectivity while maintaining lateral separation from emission areas. This dimensional transition eliminates short circuit risk while preserving connectivity function.
Solution Approach 2:
The patent introduces a stacked contact structure as an intermediary between electrodes and external connections. This intermediate structure allows electrical connectivity to be achieved through vertical pathways that do not intersect with emission areas, preventing short circuits while maintaining reliable electrical connection.
Data Source
AI summary
A display device includes a pixel including a first sub-pixel emitting light of a first color and a second sub-pixel emitting light of a second color. Each of the first sub-pixel and the second sub-pixel includes: a pixel circuit layer disposed on a substrate, the pixel circuit layer including a pixel circuit, and a display element layer disposed on the pixel circuit layer, the display element layer including a light emitting element which includes an anode electrode and a cathode electrode. The pixel circuit layer includes a first contact part disposed between the substrate and the display element layer, the anode electrode and the pixel circuit being connected to each other through the first contact part to supply an anode signal to the light emitting element. A plurality of first contact parts which include a first contact part in the first sub-pixel and a first contact part in the second sub-pixel are arranged along a first direction.