See-through Display with Insulating Layer for High Aperture Ratio
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Solution Overview
Problem
Conventional display apparatuses face challenges in achieving high-resolution, high-aperture ratio, and high-luminance see-through displays due to limitations in light-emitting element arrangement and manufacturing methods, which result in low transmittance and visibility issues.
Innovation Solution
A display apparatus with a novel structure comprising light-emitting elements, an insulating layer, and a common electrode that allows for high accuracy in processing organic layers without a shadow mask, enabling close proximity of light-emitting elements and high transmittance through a transmission region, along with a light-transmitting common electrode and insulating layers to enhance visibility and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If light-emitting elements are arranged closely to increase aperture ratio, then see-through capability is improved, but manufacturing precision deteriorates due to difficulty in processing organic layers
Solution Approach 1:
An insulating layer is introduced as an intermediary between adjacent light-emitting elements. This insulating layer acts as a physical barrier and isolation medium, enabling the organic layers of neighboring elements to be processed independently without mutual interference. The insulating layer allows close spacing of light-emitting elements while maintaining manufacturing precision by preventing organic material from adjacent elements during deposition processes.
2Manufacturing precision
If shadow mask is used for processing organic layers, then manufacturing precision is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The shadow mask component is extracted and removed from the manufacturing process. Instead of using a shadow mask to define patterns, the invention relies on the insulating layer structure and direct deposition methods. This eliminates the complex shadow mask fabrication, alignment, and handling steps while achieving comparable or superior precision through the physical isolation provided by the insulating layer between elements.
3Illumination intensity
If transmission region is enlarged to improve see-through capability, then visibility is improved, but luminance deteriorates due to reduced light-emitting area
Solution Approach 1:
The display surface is segmented into distinct light-emitting elements that are spatially separated by insulating layers. This segmentation allows the transmission region to be enlarged between elements while each element maintains its light-emitting function. The insulating layers enable this segmentation by providing electrical and physical isolation, allowing adjacent elements to be positioned closer together without compromising either see-through visibility or luminance output.
Solution Approach 2:
Different regions of the display have different properties: the light-emitting elements provide high luminance while the regions between them (transmission regions) provide high transparency. The insulating layers are strategically positioned to enable this local differentiation, allowing each region to optimize its function without interfering with adjacent regions. This local quality approach resolves the contradiction by allowing both high luminance in display regions and high transparency in transmission regions.
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 enables a display apparatus with high resolution, high aperture ratio, and high luminance, providing clear and reliable see-through capabilities with improved visibility and manufacturing yield.
Implementation Method 1
The light-emitting element includes a pixel electrode, an organic layer, and a common electrode
Data Source
AI summary
A display apparatus capable of see-through display is provided. The display apparatus includes a first region including a first light-emitting element, a second region including a second light-emitting element, and an insulating layer provided continuously across a third region that transmits external light. The first light-emitting element includes a first pixel electrode, a first organic layer, and a common electrode. The second light-emitting element includes a second pixel electrode, a second organic layer, and the common electrode. In each of the first organic layer and the second organic layer, an angle between a bottom surface and a side surface is greater than or equal to 60° and less than or equal to 120° in a cross sectional view. The insulating layer includes a portion overlapping with the first organic layer with the common electrode therebetween, a portion overlapping with the second organic layer with the common electrode therebetween, a portion in the third region, and has a light-transmitting property.