Under-screen Camera Display Substrate Light Shielding
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Solution Overview
Problem
In under-screen camera designs, the integration of a camera and display panel restricts the increase of the screen-to-body ratio due to light transmission issues, leading to reduced light entry and compromised sensor performance.
Innovation Solution
A display substrate with a first light-shielding layer that blocks light from entering the second display region, preventing glare and improving sensor performance by allowing light to pass through the first display region, which is optimized for transparency and pixel arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a camera and display panel are integrated into a display device with the camera located below the display panel, then the screen-to-body ratio can be increased, but light transmission is restricted and sensor performance is compromised
Solution Approach 1:
The display panel is divided into a first display region with light-emitting devices and a second display region without light-emitting devices. The first display region allows light transmission for sensor operation, while the second display region provides structural support and houses pixel circuits. This segmentation enables the camera and display to coexist without compromising sensor performance.
Solution Approach 2:
Different regions of the display panel are assigned different optical properties. The first display region is designed to be transparent to allow light transmission for the under-screen camera, while the second display region can have different properties. This local differentiation resolves the conflict between display functionality and light transmission requirements.
2Illumination intensity
If the second display region allows light transmission, then more light reaches the sensor, but glare occurs and sensor performance deteriorates
Solution Approach 1:
The light-emitting function is extracted from the second display region and concentrated in the first display region. By removing light-emitting devices from the second display region, light transmission is enabled without the harmful effect of glare from competing light sources, allowing clean light transmission for sensor operation.
Solution Approach 2:
The first light-shielding layer acts as an intermediary structure between the two display regions. It is positioned to overlap with the second display region in the vertical direction, controlling and directing light transmission paths to prevent glare while maintaining necessary light transmission for the sensor.
3Ease of manufacture
If pixel circuits are placed in the first display region, then electrical connection is simplified, but light transmission is blocked and sensor performance suffers
Solution Approach 1:
The display panel is segmented into functional regions: the first display region contains light-emitting devices and allows light transmission, while the second display region houses pixel circuits. This spatial segmentation separates the optical function (light transmission) from the electrical function (pixel circuit operation), resolving the contradiction between simplified electrical connection and light transmission requirements.
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
Enhances the sensing quality of under-screen sensors by reducing glare and improving light transmission, thereby improving the shooting quality of under-screen cameras.
Implementation Method 1
the display substrate comprises a first light-shielding layer, in a direction perpendicular to a surface of the display substrate, the first light-shielding layer is at least partially overlapped with the second display region
Implementation Method 2
the first display region allows light from the first side to be at least partially transmitted to the second side
Data Source
AI summary
A display substrate and a display device are provided. The display substrate has a first side for display and a second side, the display substrate includes a first display region and a second display region, the first display region allows light from the first side to be at least partially transmitted to the second side; the first display region includes a plurality of first sub-pixels, each of the first sub-pixels includes a first light-emitting device, the second display region includes a plurality of first pixel circuits, and the first pixel circuits are respectively electrically connected to a plurality of first light-emitting devices; the display region further includes a first light-shielding layer, in a direction perpendicular to a surface of the display substrate, the first light-shielding layer is at least partially overlapped with the second display region, and the first light-shielding layer is not overlapped with the first display region.