Transparent Display Pixel Layout for High Transmittance and Low Diffraction
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Solution Overview
Problem
Current transparent display devices face challenges in maximizing light emission area in non-transmissive areas while maintaining high light transmittance in transmissive areas, and preventing diffraction issues when external light passes through.
Innovation Solution
The design includes a substrate with a display area divided into transmissive and non-transmissive areas, featuring insulating layers and anode electrodes with specific protrusions to cover metal lines, and the removal of high refractive index layers and banks from the transmissive area to enhance light transmittance and prevent yellowish phenomena.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulating layers and banks are provided in the transmissive area to ensure proper device structure and function, then device reliability is improved, but light transmittance deteriorates
Solution Approach 1:
The patent removes insulating layers and banks from the transmissive area, extracting only the essential components needed for device functionality while eliminating elements that block light. This allows the transmissive area to achieve high light transmittance while the non-transmissive area retains all necessary structural components for proper device operation.
Solution Approach 2:
The display area is segmented into transmissive and non-transmissive areas with distinct structural configurations. The transmissive area contains only essential components (anode electrode, light emitting layer, cathode electrode) while the non-transmissive area includes all components including insulating layers and banks, allowing each zone to be optimized for its specific function.
2Manufacturing precision
If banks are provided in the transmissive area to define subpixel boundaries, then manufacturing precision is improved, but yellowish phenomenon occurs reducing display quality
Solution Approach 1:
The banks are extracted from the transmissive area entirely, removing the source of the yellowish phenomenon. Subpixel boundaries in the transmissive area are defined by the patterned electrodes and organic light emitting layer without requiring physical bank structures, thereby eliminating color distortion while maintaining manufacturing precision.
3Device complexity
If metal lines are exposed in the transmissive area to simplify structure, then device complexity is reduced, but diffraction occurs degrading display performance
Solution Approach 1:
The anode electrode with protruding portions acts as an intermediary structure that covers the metal lines in the transmissive area. This mediator prevents direct exposure of metal lines that would cause diffraction, while the protruding portions are designed to minimize obstruction of light transmission, thus eliminating diffraction without significantly increasing device complexity.
4Illumination intensity
If insulating layers are removed from the transmissive area to improve light transmittance, then light transmittance is improved, but light emission area in non-transmissive area may be reduced
Solution Approach 1:
The patent applies selective segmentation where insulating layers are removed only from the transmissive area while being retained in the non-transmissive area. This ensures that light transmittance is maximized where needed (transmissive area) while light emission area is preserved and maximized in the non-transmissive area where the insulating layers support the light emitting structures.
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
This configuration improves light transmittance in transmissive areas, maximizes the light emission area in non-transmissive areas, and reduces diffraction, resulting in enhanced display performance by maintaining high transmittance and preventing color distortions.
Implementation Method 1
preventing diffraction from occurring when external light passes through a transmissive area
Implementation Method 2
An insulating layer having a high refractive index is removed from the transmissive area, whereby light transmittance of the transmissive area may be improved
Data Source
AI summary
A transparent display device is disclosed, which may improve light transmittance in a transmissive area and increase or maximize a light emission area in a non-transmissive area. The transparent display device includes a substrate provided with a display area including a transmissive area and a non-transmissive area, in which a plurality of subpixels are disposed, and a non-display area surrounding the display area, at least one insulating film provided over the substrate, anode electrodes provided in each of the plurality of subpixels over the at least one insulating film, a bank provided among the anode electrodes, a light emitting layer provided over the anode electrodes, and a cathode electrode provided over the light emitting layer. The at least one insulating film and the bank are provided in only the non-transmissive area.