Display Panel Cathode Structure for High-Transmittance Optical Areas
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Solution Overview
Problem
Display devices with integrated optical electronic devices face challenges in maintaining transmittance and emission efficiency due to the need for increased bezel size or notches for accommodating these devices, which limits design flexibility and reduces the display area.
Innovation Solution
The use of an organic material-metal complex instead of a cathode patterning material in transmissive areas, along with varying bonding strengths in light emitting and transmissive areas, enhances transmittance without compromising emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a cathode patterning material is formed in transmissive areas to dispose cathode electrode in light emitting areas, then emission efficiency is maintained, but transmittance in optical area is reduced
Solution Approach 1:
The patent applies local quality by using different materials in different regions: organic material-metal complex is used in transmissive areas to maintain high transmittance, while conventional cathode patterning material is used in light emitting areas to ensure proper emission. This spatial differentiation of material properties resolves the contradiction between transmittance and emission efficiency.
Solution Approach 2:
The patent employs composite materials by combining organic materials with metal complexes to create an organic material-metal complex layer in transmissive areas. This composite structure provides both optical transparency and electrical functionality, allowing the area to serve dual purposes without compromising either transmittance or emission efficiency.
2Reliability
If optical electronic device is placed in front portion of display device to receive incident light, then light receiving function is improved, but bezel size increases or display area is reduced
Solution Approach 1:
The patent moves the optical electronic device from the front surface (2D plane) to the rear side of the display panel, utilizing the third dimension (depth) to accommodate the device. This dimensional transition allows the optical electronic device to be integrated without reducing the front display area or increasing bezel size, while still maintaining effective light receiving capability.
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 improves the transmittance of areas with optical electronic devices while maintaining emission efficiency, allowing for reduced bezel size and increased design freedom in display devices.
Implementation Method 1
The use of an organic material-metal complex instead of a cathode patterning material in transmissive areas, along with varying bonding strengths in light emitting and transmissive areas, enhances transmittance without compromising emission efficiency.
Data Source
AI summary
The present disclosure relates to a display device and a display panel. The present disclosure provides a display device including a display panel including a display area including an optical area in which at least one transmissive area and at least one light emitting area are defined, and a normal area located outside of the optical area and including a plurality of light emitting areas, a gate driving circuit configured to supply at least one gate signal to the display panel, a data driving circuit configured to convert image data into a data voltage and supplying the resulted data voltage to the display panel, and a display controller for controlling the gate driving circuit and the data driving circuit, the at least one transmissive area including an emission layer, a cohesive cathode layer disposed with a reference thickness at which self-aggregation occurs on the emission layer, and a capping layer disposed on the cohesive cathode layer.