Transparent OLED Pixel Electrode Segmentation for Light Scattering Control
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Solution Overview
Problem
Organic light emitting display devices face issues with image distortion due to light scattering through gaps between thin film transistors and wires, and high power consumption from traditional power sources.
Innovation Solution
A transparent organic light emitting display device design featuring a substrate with a transmitting region and pixel regions, utilizing thin film transistors, passivation films, and solar cell active layers to minimize light scattering and incorporate solar power as an auxiliary power source, optimizing the ratio of transmitting regions to pixel regions for balanced transparency and image stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If pixel electrodes are formed in the light transmissive region to improve image display coverage, then the image display area is increased, but light scattering increases causing image distortion
Solution Approach 1:
The substrate is divided into distinct pixel regions and light transmissive regions. Pixel electrodes are formed only within the pixel regions, while the light transmissive regions remain free of electrodes to allow clear light transmission. This spatial segmentation resolves the contradiction by allowing image display coverage in pixel regions while maintaining optical clarity in transmissive regions.
Solution Approach 2:
Different regions of the substrate are assigned different functional qualities: pixel regions contain electrodes and emit light for display, while light transmissive regions have no electrodes to maintain high optical transparency. This local differentiation allows each region to optimize its specific function without compromising the other.
2Reliability
If traditional power sources are used to ensure sufficient power supply, then the power supply stability is maintained, but power consumption is high
Solution Approach 1:
The solar cell is integrated as an auxiliary power source that can supplement or replace traditional power sources. This multi-functionality allows the display device to operate with reduced power consumption by harvesting solar energy, while maintaining power supply stability through the combination of solar cell and traditional power source.
Solution Approach 2:
The solar cell enables the display device to generate its own power from sunlight, reducing dependence on external power sources and lowering overall power consumption. This self-service capability allows the device to sustain operation with minimal external energy input while maintaining stable performance.
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 prevents image distortion by reducing light scattering and reduces power consumption by utilizing solar power, enhancing the transparency and stability of the display while maintaining high image quality and reduced energy usage.
Implementation Method 1
an organic light emitting layer that is interposed between the pixel electrode and the facing electrode to emit light
Implementation Method 2
a solar cell active layer interposed between the first electrode and the second electrode
Data Source
AI summary
An organic light emitting display device is disclosed. In one embodiment, the organic light emitting display device includes: i) a substrate having a transmitting region and a plurality of pixel regions separated from each other by the transmitting region, wherein the substrate has first and second surfaces opposing each other; ii) at least one thin film transistor formed in each of the pixel regions over the first surface of the substrate and iii) a passivation film covering the thin film transistors. The device may further include a plurality of pixel electrodes formed on the passivation film, wherein each of the pixel electrodes is electrically connected to and formed substantially directly above the corresponding thin film transistor, wherein each of the pixel electrodes is formed only in the corresponding pixel region, and wherein the pixel electrodes are separated from each other. The device may further include a solar cell active layer formed below the second surface.