Transparent OLED Subpixel Layout to Weaken Diffraction Blur
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Solution Overview
Problem
Current transparent OLED displays face challenges with diffraction effects due to regular transparent areas, leading to blurring of objects behind the screen and reduced transparency and resolution.
Innovation Solution
Incorporating an auxiliary cathode in the transparent area, connected with the second power supply line, which changes the transparent area into an irregular shape, reducing diffraction by generating diffraction fringes at different positions and directions, and providing a low-level signal to the cathode of the light emitting element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a regular transparent area is used in the OLED display, then the display structure is simple and manufacturing is easy, but diffraction effects occur causing blurring and reduced transparency
Solution Approach 1:
The patent introduces an auxiliary cathode in the transparent area that changes the regular transparent area into an irregular shape. This asymmetric structure generates diffraction fringes at different positions and directions, effectively weakening the harmful diffraction effect that causes blurring while maintaining manufacturing feasibility
Solution Approach 2:
The patent converts the harmful diffraction effect into a beneficial one by strategically placing the auxiliary cathode to generate diffraction fringes that counteract the blurring effect. The auxiliary cathode's irregular positioning creates controlled diffraction that improves overall image quality by reducing the negative diffraction from the regular transparent area
2Measurement precision
If the transparent area is modified to reduce diffraction, then transparency and resolution improve, but the structural layout becomes more complex
Solution Approach 1:
The auxiliary cathode serves multiple functions: it acts as an electrode for the OLED light emitting element, modifies the transparent area shape to reduce diffraction, and generates beneficial diffraction fringes. This multi-functionality improves resolution and transparency without adding separate components, thereby limiting the increase in structural complexity
3Object-affected harmful factors
If the auxiliary cathode is added to the transparent area, then diffraction effect is reduced and transparency improves, but the device structure becomes more complex
Solution Approach 1:
The auxiliary cathode is merged with the transparent area structure rather than being a separate added component. By integrating the auxiliary cathode into the existing OLED layer structure and combining its multiple functions (electrode function, diffraction control, shape modification), the patent reduces the harmful diffraction effect while minimizing the increase in overall device complexity
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 approach significantly weakens the diffraction effect, improves transparency, and enhances the display's resolution and uniformity, while simplifying the structural layout and reducing the space occupied by each sub-pixel.
Implementation Method 1
Incorporating an auxiliary cathode in the transparent area, connected with the second power supply line, which changes the transparent area into an irregular shape, reducing diffraction by generating diffraction fringes at different positions and directions
Data Source
AI summary
Provided are a display substrate and a preparation method thereof, and a display apparatus. The display substrate includes a plurality of display units. The display unit includes a display area and a transparent area. The display area includes a plurality of sub-pixels. In a direction perpendicular to the display substrate, the sub-pixel includes a first metal layer, a semiconductor layer, a second metal layer and a third metal layer which are arranged on a substrate. The first metal layer includes a first plate, the semiconductor layer includes a second plate, the second metal layer includes a first scanning line and a second scanning line, and the third metal layer includes a third plate, a first power supply line, a second power supply line, a compensation line and a data line.