Display Substrate Light-Shielding Layout for Under-Display Sensors
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Solution Overview
Problem
Existing display technologies face challenges in achieving a high screen-to-body ratio while accommodating front-facing devices such as front cameras, light sensors, and biosensors, as conventional notch designs still leave non-display areas that reduce the effective display area.
Innovation Solution
A display substrate with a light-shielding layer having openings for ambient light and electrical connections to prevent interference, allowing front-facing sensors to operate without occupying display space, and via holes with varied depths and diameters to ensure stable power supply to the light-shielding layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If front-facing devices (camera, sensors) are arranged toward the front side of the display apparatus, then these devices can collect environmental information effectively, but the screen-to-body ratio is reduced due to the need for non-display areas
Solution Approach 1:
The patent merges the front-facing sensor functionality with the display area by integrating sensors beneath the display layer, allowing both display and sensing functions to occupy the same physical space, thereby eliminating the need for separate non-display areas for sensor placement
Solution Approach 2:
The patent transitions from a planar arrangement where sensors occupy front surface area to a multi-layered structure where sensors are positioned in the depth dimension beneath the display, enabling vertical integration that preserves the screen-to-body ratio while maintaining sensor functionality
2Reliability
If a light-shielding layer is introduced to prevent interference between display and sensor functions, then display quality is improved, but the device complexity increases
Solution Approach 1:
The light-shielding layer serves multiple functions simultaneously: it shields ambient light from interfering with sensor detection, prevents display light from affecting sensor readings, and provides structural support for the integrated sensor array, thereby reducing the need for additional separate components
Solution Approach 2:
The patent implements a nested structure where the light-shielding layer is integrated within the display stack, with sensors positioned beneath it and display elements above it, creating a compact multi-functional layer that reduces overall device complexity compared to separate components
3Reliability
If via holes with varied depths and diameters are created to ensure stable power supply to the light-shielding layer, then power supply stability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies different via hole depths and diameters at different locations within the light-shielding layer, optimizing power supply characteristics for specific regions while maintaining overall manufacturing feasibility through localized rather than uniform modifications
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3A~3B
AI summary
A display substrate is provided, and the display substrate has a display area and a peripheral area surrounding the display area. The display area includes a first display area. The display substrate includes a base substrate, a first light-shielding layer, a plurality of first sub-pixels and a first power line. The first light-shielding layer is disposed on a side of the base substrate, the first light-shielding layer is located in the first display area, and has a plurality of openings arranged in an array. The first sub-pixels are disposed at a side of the first light-shielding layer away from the base substrate and are located in the first display area, and orthogonal projections of the first sub-pixels on the base substrate are non-overlapping with orthogonal projections of the openings on the base substrate. The first power line includes a first power bus and a plurality of first power sub-lines, and the first light-shielding layer is electrically connected to the first power line.