Transmissive Display Substrate Grid Layout for Under-Display Sensors
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Solution Overview
Problem
Existing display technologies face challenges in integrating under-display cameras and sensors without compromising the screen-to-body ratio and display functionality, particularly in flexible OLED and QLED displays.
Innovation Solution
A display substrate design incorporating a transmissive display area with a grid-like transmission line structure, allowing for both image display and light transmission, and a manufacturing method that forms a closed grid structure with orthogonal transmission lines to connect pixel drive circuits and electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a transmissive display area is added to integrate under-display cameras and sensors, then the integration capability is improved, but the display quality and light transmission uniformity deteriorate
Solution Approach 1:
The display area is divided into a normal display area and a transmissive display area. The transmissive display area is further segmented into multiple pixel islands, each containing multiple pixel units. This segmentation allows the display to simultaneously maintain high-quality image display in the normal area while providing light transmission functionality in the transmissive area for under-display camera and sensor integration.
Solution Approach 2:
Different regions of the display substrate are assigned different functional qualities. The normal display area is optimized for image display with complete pixel structures, while the transmissive display area is optimized for light transmission with modified pixel structures that include transparent transmission lines instead of opaque signal lines, enabling both functions to coexist without compromising overall display quality.
2Ease of manufacture
If traditional signal transmission lines are used in the transmissive display area, then the manufacturing process is simple, but the light transmission is blocked and display quality deteriorates
Solution Approach 1:
The signal transmission lines in the transmissive display area are transformed from opaque to transparent by changing their material composition and optical parameters. The transparent transmission lines maintain electrical conductivity while allowing light to pass through, thus improving light transmission intensity without significantly complicating the manufacturing process.
3Area of stationary object
If the screen-to-body ratio is increased to improve display area utilization, then the display area is maximized, but the integration of under-display components becomes difficult
Solution Approach 1:
The transmissive display area serves multiple functions: it maintains display functionality through pixel units, enables light transmission for under-display cameras and sensors, and provides signal transmission through transparent transmission lines. This multi-functionality allows the display substrate to integrate under-display components without sacrificing display area or screen-to-body ratio.
Data Source
AI summary
A display substrate includes a normal display area and a transmissive display area provided within the normal display area, the normal display area being configured to perform image display, the transmissive display area including at least one pixel island, the pixel island being configured to perform image display and transmit light; the pixel island of the transmissive display area including an initial transmission line for transmitting an initial signal and at least one pixel drive circuit connected to the initial transmission line, the initial transmission line including a first transmission line with a main part extending in a first direction and a second transmission line with a main part extending in a second direction, the first transmission line and the second transmission line being connected to form a grid structure.