Transparent OLED Pixel and Transmission Region Layout
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Solution Overview
Problem
Conventional transparent organic light-emitting display devices suffer from reduced transparency, light scattering, and color reproduction issues due to the arrangement of thin film transistors and conductive lines, leading to image distortion and variations in color coordinates with viewing angles.
Innovation Solution
The design incorporates a first substrate with separate transmitting and pixel regions, featuring thin film transistors, a passivation layer, pixel electrodes, an organic emission layer, and a color filter, with a ratio of transmitting regions to pixel regions between 5% and 90%, and a conductive unit between substrates to enhance light transmission and minimize scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If thin film transistors and conductive lines are arranged in the display device, then the device functionality is improved, but transparency is reduced and light scattering increases
Solution Approach 1:
The display device is segmented into pixel regions and transmitting regions. The transmitting regions are specifically designed to separate adjacent pixel regions, creating dedicated light transmission pathways that minimize interference from conductive lines and TFT structures, thereby improving overall transparency while maintaining device functionality.
Solution Approach 2:
Different regions of the display device are assigned different optical properties. The transmitting regions have optimized transparency characteristics with minimal conductive line coverage, while pixel regions contain the functional TFT and conductive line structures. This local differentiation allows each region to perform its specialized function optimally.
2Reliability
If conducting lines are arranged to connect thin film transistors, then electrical connectivity is improved, but image distortion increases due to light scattering
Solution Approach 1:
The harmful light scattering effect of conductive lines is extracted and isolated by positioning these lines primarily within pixel regions rather than transmitting regions. This separation removes the source of image distortion from the light transmission pathways, allowing electrical connectivity to be maintained without compromising image quality.
Solution Approach 2:
Transmitting regions act as intermediary zones between pixel regions, providing optical isolation that prevents light scattering from conductive lines in one pixel region from affecting adjacent pixel regions. This intermediary structure maintains electrical connectivity while minimizing image distortion.
3Reliability
If pixel electrodes overlap thin film transistors, then electrical connection is improved, but transparency in transmitting regions is reduced
Solution Approach 1:
The electrode structure is segmented into pixel electrodes located within pixel regions and transparent electrodes extending into transmitting regions. This segmentation allows the pixel electrodes to maintain electrical connection with TFTs while the transparent electrode portions in transmitting regions minimize light scattering and maintain high transparency.
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 transparency, reduces image distortion, and maintains color reproduction range without variations in color coordinates across viewing angles, providing a clearer and more stable display.
Implementation Method 1
an organic light-emitting display device
Implementation Method 2
the opposite electrode facing the plurality of pixel electrodes and being configured to transmit light
Data Source
AI summary
An organic light-emitting display device includes a first substrate having transmitting regions and pixel regions separated from each other by the transmitting regions, a plurality of thin film transistors on the first substrate in the pixel regions, a passivation layer covering the plurality of thin film transistors, a plurality of pixel electrodes on the passivation layer and electrically connected to the thin film transistors, the pixel electrodes being in the pixel regions and overlapping the thin film transistors, an opposite electrode in the transmitting regions and the pixel regions, the opposite electrode facing the plurality of pixel electrodes and being configured to transmit light, an organic emission layer interposed between the pixel electrodes and the opposite electrode, and a color filter in corresponding pixel regions.