Transparent OLED Substrate with Transmitting Regions
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Solution Overview
Problem
Transparent organic light emitting display devices suffer from low transmittance and image distortion due to light scattering from the patterns of thin film transistors and wires, which limits their transparency and clarity.
Innovation Solution
The device is designed with a substrate having transmitting regions between pixel regions, featuring thin film transistors, a passivation layer, pixel electrodes overlapping the transistors, an opposite electrode with openings in the transmitting regions, and an organic emission layer to enhance light transmission and reduce scattering, thereby improving transmittance and preventing image distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If transparent thin film transistors and transparent organic light emitting devices are used to form a transparent display device, then the device achieves transparency and self-light emitting characteristics, but the transmittance remains low due to the patterns of TFTs and wires and the small spaces between them
Solution Approach 1:
The patent extracts the harmful scattering effect by removing the gate electrode pattern from the light transmission path. The gate electrode is positioned only in the pixel region and extended into the transmitting region is eliminated, so light passing through the transmitting region does not encounter the gate pattern that causes scattering. This separates the functional region (pixel) from the transmission region (transmitting region), allowing high transmittance in the transmitting region while maintaining device functionality in the pixel region.
Solution Approach 2:
The display device is segmented into distinct pixel regions and transmitting regions. The pixel regions contain all the TFT patterns and wire structures necessary for device operation, while the transmitting regions are designed to be free of scattering patterns. This spatial segmentation allows the device to simultaneously achieve both functionality and transparency, with the transmitting regions providing high transmittance for viewing external images.
2Manufacturing precision
If gaps between patterns are reduced to a few nanometers to achieve higher resolution, then the device achieves finer pixel definition, but light scattering increases causing image distortion
Solution Approach 1:
The patent removes the gate electrode pattern from the transmitting region entirely, eliminating the primary source of light scattering. By positioning the gate electrode only within the pixel region and preventing its extension into the transmitting region, the design extracts the harmful scattering element from the light path while maintaining the necessary pixel definition through proper positioning of the gate electrode at the boundary between pixel and transmitting 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
This configuration increases the transmittance of external light and minimizes image distortion by strategically placing conductive patterns in pixel regions and optimizing the ratio of transmitting to pixel regions, allowing for clearer external image observation while maintaining image integrity.
Implementation Method 1
an organic emission layer interposed between respective ones of the pixel electrodes and the opposite electrode to emit light
Implementation Method 2
an opposite electrode facing the pixel electrodes and formed to be able to transmit light, the opposite electrode is located in the transmitting regions and the pixel regions and includes first openings formed on locations corresponding to at least a portion of respective ones of the transmitting regions
Data Source
AI summary
A transparent organic light emitting display device having an improved transmittance, in which transmittance of external light is increased, the organic light emitting display device including: a substrate having transmitting regions interposed between pixel regions; thin film transistors positioned on a first surface of the substrate and respectively disposed in the pixel regions of the substrate; a passivation layer covering thin film transistors; pixel electrodes formed on the passivation layer and respectively electrically connected to the thin film transistors, the pixel electrodes are respectively located in an area corresponding to the pixel regions, and are disposed to respectively overlap and cover the thin film transistors; an opposite electrode facing the pixel electrodes and formed to be able to transmit light, the opposite electrode is located in the transmitting regions and the pixel regions and includes a first opening formed on a location corresponding to at least a portion of respective ones of the transmitting regions; and an organic emission layer interposed between respective ones of the pixel electrodes and the opposite electrode to emit light.