Transparent OLED Electrode Thickness and Dual Emission
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Solution Overview
Problem
Transparent OLED devices face reduced pixel lifetime and increased power consumption due to the need for high luminance modes to compensate for reduced opening ratios and light transmission functions, which affect image quality and efficiency.
Innovation Solution
The OLED device incorporates a second lower electrode with a thickness less than the first lower electrode, positioned at the same level as the gate electrode, and a second light emitting layer in the transparent region that emits white colored light, reducing manufacturing processes and costs while increasing capacitance and preventing pixel deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a transparent region is included in the OLED device to transmit images, then light transmission function is improved, but the opening ratio of pixels is reduced
Solution Approach 1:
The pixel region is divided into a sub-pixel region for light emission and a transparent region for light transmission. This segmentation allows each region to perform its specific function optimally without interfering with the other, resolving the contradiction between maintaining opening ratio and providing transparent region.
2Illumination intensity
If the OLED device operates in high luminance mode to compensate for reduced image quality, then image quality is improved, but power consumption increases and pixel lifetime is reduced
Solution Approach 1:
The second lower electrode in the transparent region is designed with different properties (thin thickness and transparency) compared to the first lower electrode in the sub-pixel region. This local differentiation allows the transparent region to transmit external images while the sub-pixel region maintains display quality, eliminating the need for high luminance operation and reducing power consumption.
3Illumination intensity
If the second lower electrode is made thin and transparent, then light transmission is improved, but electrode strength may be reduced
Solution Approach 1:
The thickness parameter of the second lower electrode is changed to be thinner than the first lower electrode, enabling transparency for light transmission. This parameter change is compensated by the overall electrode structure design where the thin electrode is positioned at the same level as the gate electrode, maintaining structural integrity while achieving optical 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 enhances the OLED device's efficiency by reducing power consumption, extending pixel lifetime, and maintaining image quality through dual emission structures and optimized electrode thickness, allowing for clearer image transmission and reduced manufacturing costs.
Implementation Method 1
a second light emitting layer disposed in the transparent region and positioned on the first lower electrode
Implementation Method 2
The second lower electrode has a second thickness that is less than the first thickness, and is transparent
Data Source
AI summary
An organic light emitting diode display device comprises a substrate which includes a plurality of pixel regions each having a sub-pixel region and a transparent region. In each pixel region, an active layer is disposed in the sub-pixel region. A gate electrode overlaps the active layer. A first electrode is disposed on the active layer, and contacts the active layer. A second electrode is spaced apart from the first electrode, and contacts the active layer. A first lower electrode having a first thickness is disposed in the sub-pixel region and connected to the second electrode. A second lower electrode is disposed in the transparent region on the substrate, located at a same level as the gate electrode. The second lower electrode has a second thickness that is less than the first thickness, and is transparent.