OLED Cathode Patterning for Under-Screen Camera Light Transmittance
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Solution Overview
Problem
OLED display panels have poor light transmittance, particularly in applications like under-screen cameras, which affects the shooting quality due to inadequate light transmission.
Innovation Solution
The display panel incorporates a patterned area with cathode groups and transparent wirings that connect to a VSS signal line, reducing IR drop and enhancing light transmittance by arranging cathodes in a manner that covers the light-emitting layer and using transparent wirings to improve electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional OLED display panel structure is used, then the display function is achieved, but the light transmittance is poor which affects under-screen camera shooting quality
Solution Approach 1:
The cathode is divided into multiple separate cathode electrodes arranged in an array, with each cathode electrode corresponding to one or more OLED devices. This segmentation allows light to pass through the gaps between cathodes, significantly improving light transmittance in the patterned area where the under-screen camera is located, while still providing sufficient electrical connection points for OLED operation
Solution Approach 2:
The display panel is divided into different areas with different cathode configurations: the patterned area (for under-screen camera) uses segmented cathodes to maximize light transmittance, while other areas may use different cathode arrangements to optimize display performance. This local differentiation allows each area to have optimal properties for its specific function
2Reliability
If cathodes are arranged to cover the light-emitting layer for electrical connection, then electrical connectivity is improved, but light transmission is blocked
Solution Approach 1:
Instead of using a continuous cathode layer that would block light, the cathode is segmented into multiple discrete cathode electrodes arranged in a pattern. Each cathode electrode provides electrical connection to its corresponding OLED device(s), while the spaces between electrodes allow light to pass through to the under-screen camera
Solution Approach 2:
The cathode electrodes are arranged in a two-dimensional pattern with specific spacing and positioning, creating a balance between electrical connection coverage and light transmission areas. The orthographic projection of each cathode covers the light-emitting layer for electrical connection, while the overall patterned arrangement maintains light transmission pathways
3Illumination intensity
If transparent wirings are used to connect cathodes to VSS signal line, then light transmittance is improved, but electrical connection complexity increases
Solution Approach 1:
Multiple cathode electrodes within the same group are electrically connected through common first wirings, which are in turn connected to the second wiring leading to the VSS signal line. This merging approach reduces the total number of independent connection paths while maintaining electrical connectivity to all necessary cathodes, simplifying the overall wiring structure despite using transparent materials
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 significantly increases light transmittance in the patterned area, improving the shooting quality of under-screen cameras by reducing voltage drop and ensuring uniform voltage distribution across OLED devices.
Implementation Method 1
the display panel further comprises a plurality of first wirings and a second wiring, the plurality of first wirings are electrically connected to the plurality of cathodes in one-to-one correspondence, and the second wiring is electrically connected to the plurality of first wirings and electrically connected to a VSS signal line
Implementation Method 2
a patterned area, the patterned area comprising at least one cathode group, each of the at least one cathode group comprising a plurality of cathodes arranged at intervals
Data Source
AI summary
A display panel, includes: a substrate; and a plurality of OLED devices disposed on the substrate, each of which includes an anode and a light-emitting layer arranged in stack; further includes a patterned area, the patterned area comprising at least one cathode group, each of which includes a plurality of cathodes arranged at intervals, and an orthographic projection of each of the plurality of cathodes on the substrate at least covers an orthographic projection of the light-emitting layer of one of the plurality of OLED devices on the substrate; and for each of the at least one cathode group, the display panel further includes a plurality of first wirings electrically connected to the plurality of cathodes in one-to-one correspondence and a second wiring electrically connected to the plurality of first wirings and electrically connected to a VSS signal line. A display device is further provided.