Transparent OLED Zigzag Layout for High Transmittance
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Solution Overview
Problem
Current transparent OLED devices face challenges in achieving high transmittance due to limited area of transparent regions, which is constrained by the layout of emissive regions and process margins, leading to reduced aperture ratio and transmittance.
Innovation Solution
The layout of emissive regions is modified to a zigzag pattern with respect to gate and data lines, allowing the transparent regions to expand while maintaining the area of emissive regions, thereby increasing the aperture ratio and transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the area of driving region in emissive region is reduced to increase transparent region area, then transmittance is improved, but reliability of the device decreases due to insufficient space for components
Solution Approach 1:
The patent applies dimensionality change by arranging emissive regions in a staggered pattern across multiple layers rather than in a single plane. This vertical stacking allows transparent regions to expand horizontally while driving regions are distributed across layers, maintaining component reliability without compromising transmittance.
Solution Approach 2:
The patent segments the driving region across multiple layers, with each layer containing a portion of the driving components. This segmentation allows the transparent region area in each layer to be maximized while the complete driving function is distributed across all layers, resolving the contradiction between transparent area and reliability.
2Area of stationary object
If the area of pixel is increased to achieve high transmittance, then aperture ratio is improved, but device size increases and resolution is compromised
Solution Approach 1:
The patent transitions from two-dimensional pixel expansion to three-dimensional multi-layer stacking. By arranging emissive and transparent regions across multiple layers in a staggered configuration, the patent achieves high aperture ratio without increasing the footprint area of each pixel, thus maintaining high resolution while improving transmittance.
3Manufacturing precision
If emissive regions are disposed in line with process margins to avoid overlap, then manufacturing precision is maintained, but transparent region area is reduced due to increased gap requirements
Solution Approach 1:
The patent resolves the manufacturing precision constraint by stacking emissive regions in alternating layers rather than spacing them linearly in one layer. This vertical arrangement eliminates the need for large horizontal process margins between adjacent emissive regions, as layers are formed in sequential deposition processes. Consequently, transparent regions can be maximized in the horizontal plane while maintaining precise manufacturing control.
Data Source
AI summary
Disclosed herein is a transparent organic light-emitting display (OLED) device. A first sub-pixel includes a first transparent region and a first emissive region disposed in line with the first transparent region in a first direction, and a second sub-pixel includes a second transparent region area and a second emissive region in line with the second transparent region in the first direction. The second sub-pixel is disposed adjacent to the first sub-pixel in the second direction. The first emissive region is in line with the second transparent region in a second direction, and the second emissive region is in line with the first transparent region in the second direction. In the transparent OLED device according to an exemplary embodiment of the present disclosure, emissive regions are disposed in a zigzag pattern with respect to a gate line, so that the area of the transparent regions can be enlarged, and accordingly higher transmittance can be achieved.