OLED Display Panel Cathode Light Transmittance
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Solution Overview
Problem
In OLED full-screen display devices, the cathode electrode has low light transmittance, preventing optical components under the screen from receiving sufficient light signals, which affects their normal operation.
Innovation Solution
A display panel with a first display area and a second display area, where the first display area has a higher light transmittance due to a patterned cathode layer and an optical layer with total reflective surfaces, allowing more external light to be reflected into the first display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a cathode electrode is disposed on the entire surface of the OLED full-screen display device to achieve uniform display, then the display uniformity is improved, but the light transmittance deteriorates, preventing optical components under the screen from receiving sufficient light signals
Solution Approach 1:
The cathode electrode is designed with different thicknesses in different regions: a first thickness in the first display area (with optical components) and a second thickness in the second display area (without optical components). This local differentiation allows the first display area to have higher light transmittance for optical component operation, while the second display area maintains sufficient cathode thickness for display uniformity.
Solution Approach 2:
The display area is divided into a first display area and a second display area based on functional requirements. The first display area is designed for optical component operation with higher light transmittance, while the second display area is designed for display function with uniform cathode thickness. This segmentation resolves the contradiction by allowing different regions to optimize for their specific functions.
2Reliability
If the cathode electrode thickness is increased to improve display performance, then the display quality is improved, but the light transmittance further deteriorates, affecting optical component operations
Solution Approach 1:
The cathode electrode thickness is locally optimized: thinner in the first display area to allow sufficient light transmission for optical components, and thicker in the second display area to ensure display quality and uniformity. This resolves the contradiction between display quality and light transmittance by applying different thickness requirements to different functional 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
The solution ensures that optical components in the first display area receive sufficient light signals, improving their performance and enabling full-screen display devices with enhanced user experience.
Implementation Method 1
an optical layer disposed on a side of the cathode layer away from the pixel defining layer, and comprising a plurality of first optical structures corresponding to the supporting portions, wherein each of the first optical structures comprises a first surface close to the cathode layer, a second surface opposite to the first surface, and a side surface that is a total reflective surface
Data Source
AI summary
A display panel includes a first display area. The first display area includes a display substrate and an optical layer. The display substrate includes a pixel defining layer and a cathode layer disposed on the pixel defining layer. The pixel defining layer includes a plurality of pixel openings and a plurality of supporting portions each disposed between two adjacent pixel openings. A thickness of a part of the cathode layer on each of the pixel opening is greater than a thickness of a part of the cathode layer on each of the supporting portions. The optical layer is disposed on the cathode layer and includes a plurality of first optical structures corresponding to the supporting portions. Each of the first optical structures includes a first surface close to the cathode layer, a second surface opposite to the first surface, and a side surface that is a total reflective surface.