Overlapping Display Panel Structure for Inconspicuous Seams
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Solution Overview
Problem
Existing display devices face challenges in increasing size, minimizing seam visibility, reducing thickness and weight, suppressing display and luminance unevenness, and displaying images on curved surfaces while maintaining high reliability and quality.
Innovation Solution
A display panel design featuring a bottom-emission structure with a visible-light-transmitting common electrode and a dual-emission light-emitting element configuration, where the common electrode is optimized to reduce resistance and extend to the visible-light-transmitting region, and the use of overlapping display panels with a visible-light-transmitting region to minimize seams and enhance light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display device size is increased, then the display region area is improved, but the seam visibility between adjacent panels worsens
Solution Approach 1:
The patent extracts the light-emitting function from the display region and places it in a separate visible-light-transmitting region. This allows the display region to be tiled with adjacent panels while the visible-light-transmitting region overlaps between panels to hide seams, effectively separating the display function from the seam-hiding function.
Solution Approach 2:
The patent introduces a spatial dimension by creating an overlapping arrangement where the visible-light-transmitting region of one panel extends into the display region of an adjacent panel. This dimensional arrangement allows light to pass through the overlapping region, making the seam invisible while maintaining large display area.
2Illumination intensity
If the common electrode transmits visible light, then the light transmission is improved, but the electrical resistance increases
Solution Approach 1:
The patent employs a composite electrode structure combining transparent conductive oxide layers (such as ITO, IZO, or ZnO) with metal layers. This composite material approach allows the electrode to simultaneously transmit visible light effectively while maintaining low electrical resistance through the conductive metal component.
Solution Approach 2:
The patent optimizes the thickness parameters of different electrode layers to achieve the desired balance. By controlling the thickness of transparent conductive oxide layers and metal layers, the electrode structure achieves both high visible light transmission and low electrical resistance.
3Length of moving object
If the display device thickness is reduced, then the device portability is improved, but the manufacturing precision requirements worsen
Solution Approach 1:
The patent divides the display device into multiple functional layers with distinct responsibilities. The visible-light-transmitting region is separated from the display region, and each layer is designed with specific thickness optimizations. This segmentation allows each layer to be manufactured with appropriate precision tolerances while achieving overall thinness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution allows for larger display sizes with reduced seams, improved display quality by minimizing luminance variations, and increased reliability by reducing impurity entry, while enabling display on curved surfaces with enhanced portability and cost-effectiveness.
Implementation Method 1
The first common electrode has a function of reflecting visible light
Implementation Method 2
The first pixel electrode, the second pixel electrode, and the second common electrode each have a function of transmitting visible light
Implementation Method 3
Light-emitting elements (also referred to as EL elements) utilizing electroluminescence
Data Source
AI summary
A display device including display regions with inconspicuous seam is provided. The display device includes a first display panel and a second display panel. The first display panel includes a first display region and a visible-light-transmitting region. The second display panel includes a second display region. The first display region is adjacent to the visible-light-transmitting region. The first display region includes a first light-emitting element and a second light-emitting element. A first common electrode included in the first light-emitting element includes a portion in contact with a second common electrode included in the second light-emitting element. The first common electrode has a function of reflecting visible light. The second common electrode has a function of transmitting visible light. The second light-emitting element is positioned closer to the visible-light-transmitting region than the first light-emitting element. The second display region includes a portion overlapping with the second light-emitting element and a portion overlapping with the visible-light-transmitting region.