Transparent Display Device Non-Transmissive Area Reduction
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Solution Overview
Problem
Existing transparent display devices face challenges in improving light transmittance due to the presence of non-transmissive areas, which are necessary for housing circuits and signal lines.
Innovation Solution
The design incorporates a substrate with transmissive areas and subpixels positioned between them, featuring a first electrode with divided electrodes connected by a connection electrode, an organic light emitting layer, and a second electrode, while efficiently arranging signal lines in non-transmissive areas to minimize their size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-transmissive areas are provided to house circuits and signal lines, then device functionality is ensured, but light transmittance is reduced
Solution Approach 1:
The patent applies dimensionality change by routing signal lines through the thickness direction (z-axis) of the display device rather than only in the plane. Connection electrodes extend through multiple layers to connect divided electrodes in different subpixels, allowing signal lines to pass through the non-display area in the vertical dimension. This reduces the lateral footprint of non-transmissive areas while maintaining electrical connectivity, thereby improving light transmittance without sacrificing device functionality.
Solution Approach 2:
The patent divides the first electrode into multiple divided electrodes (first divided electrode, second divided electrode) that are spatially separated. These divided electrodes are connected through connection electrodes that extend in the thickness direction. This segmentation allows the non-transmissive area to be minimized by distributing electrode functions across different spatial locations and layers, reducing the continuous non-transmissive region while maintaining electrical functionality.
2Reliability
If signal lines are arranged in non-transmissive areas, then circuit connectivity is maintained, but non-transmissive area size increases
Solution Approach 1:
The patent utilizes the thickness direction as an additional dimension for routing connection electrodes. Instead of expanding non-transmissive areas laterally to accommodate signal lines, the connection electrodes extend vertically through the display structure, connecting divided electrodes across different layers. This three-dimensional routing approach maintains circuit connectivity while minimizing the lateral footprint of non-transmissive areas, thereby reducing their size without compromising connectivity.
3Illumination intensity
If transmissive area is increased to improve light transmittance, then light transmittance is enhanced, but space for circuits and signal lines is reduced
Solution Approach 1:
The patent resolves this contradiction by moving circuit routing into the thickness direction. Connection electrodes extend vertically through the display device to connect divided electrodes, utilizing the z-axis dimension for signal line placement. This allows the lateral plane to be maximized for transmissive areas while circuits and signal lines are accommodated in the vertical dimension, thereby enhancing light transmittance without reducing the space available for circuits.
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 reduces the size of non-transmissive areas and enhances light transmittance, allowing for clearer viewing of objects or images behind the display device.
Implementation Method 1
an organic light emitting layer provided over the first electrode
Data Source
AI summary
A transparent display device may reduce or minimize a size of a non-transmissive area and improve light transmittance. The transparent display device comprises a substrate provided with transmissive areas and a plurality of subpixels disposed between the transmissive areas, a first electrode provided in each of the plurality of subpixels, including a first divided electrode and a second divided electrode, a connection electrode connecting the first divided electrode with the second divided electrode in a straight line, an organic light emitting layer provided over the first electrode, and a second electrode provided over the organic light emitting layer.