Display Substrate Polarization Stack for Light Extraction
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Solution Overview
Problem
The placement of a camera under a display panel in under-screen camera designs obstructs light entry, affecting front camera functions such as self-photographing and face recognition due to the display panel blocking light.
Innovation Solution
A display substrate design with specific layer configurations, including power supply lines and data lines intersecting at different directions, reduced metal wire density in the camera area, and optimized pixel circuits to enhance light transmittance and camera functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a camera is placed under a display panel to achieve under-screen camera design, then screen-to-body ratio is improved, but light transmittance deteriorates due to the display panel blocking light
Solution Approach 1:
The patent applies local quality by creating a camera area with reduced metal wire density and optimized pixel circuits specifically in the region where the under-screen camera is located. This localized optimization allows light to pass through more easily in the camera area while maintaining full functionality in other display regions, thus resolving the contradiction between high screen-to-body ratio and adequate light transmittance for the camera.
2Illumination intensity
If metal wire density is reduced in the camera area to improve light transmittance, then camera functionality is improved, but electrical connectivity may deteriorate
Solution Approach 1:
The patent employs another dimension by utilizing multiple layers (first gate metal layer, second gate metal layer, first source-drain metal layer) to provide electrical connectivity. By distributing connection lines across different layers and directions, the patent ensures adequate electrical connectivity even with reduced metal wire density in the camera area, thus resolving the contradiction between improved light transmittance and maintained electrical connectivity.
3Device complexity
If power supply lines and data lines are arranged in intersecting directions to optimize circuit layout, then device integration is improved, but light blocking increases
Solution Approach 1:
The patent applies segmentation by dividing the metal wiring into different layers (first gate metal layer with power supply lines, second gate metal layer, first source-drain metal layer with data lines). This layered segmentation allows circuit functions to be distributed across multiple levels, reducing the density of metal wires in any single layer within the camera area, thus optimizing both circuit layout and light transmittance.
Data Source
AI summary
A display substrate and a display device are provided. The display substrate includes a light emitting element disposed on a base substrate, and an encapsulation layer, a connection layer, a light extraction layer, a polarization conversion layer and a polarization layer stacked sequentially at a light exiting side of the light emitting element. The light extraction layer is configured to convert at least a portion of light emitted by the light emitting element incident onto the light extraction layer into circularly polarized light with a set rotational direction to pass through the light extraction layer. The polarization conversion layer is configured to convert the circularly polarized light passing through the light extraction layer into linearly polarized light, with a polarization direction parallel to a direction of a light transmission axis of the polarization layer; the connection layer is configured to bond the light extraction layer to the encapsulation layer.