Display Substrate Shielding Layer for Under-Panel Camera Brightness Uniformity
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Solution Overview
Problem
Current display technologies face challenges in achieving uniform luminous brightness across full-screen displays with under-panel cameras, as the overlap of pixel driving circuits and light-emitting devices can cause parasitic capacitance, leading to brightness unevenness.
Innovation Solution
A display substrate design with distinct light transmittance areas, featuring a shielding layer with isolation parts that overlap gate connecting electrodes to prevent signal interference, and pixel driving circuits connected via traces that minimize parasitic capacitance, ensuring uniform drive current and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If pixel driving circuits are disposed under the light-emitting devices to achieve high screen-to-body ratio, then the display area is increased, but parasitic capacitance is generated causing brightness unevenness
Solution Approach 1:
A shielding layer is introduced as an intermediary component between the pixel driving circuits and the light-emitting devices. This shielding layer includes isolation parts that are electrically connected to a reference potential, creating an electromagnetic shield that prevents parasitic capacitance formation while allowing the under-display camera functionality to be maintained.
Solution Approach 2:
The pixel driving circuits are segmented into different regions: some are disposed in the display area while others are disposed in the non-display area. This segmentation allows the display area to be maximized for high screen-to-body ratio while placing certain driving circuits outside the display area to minimize parasitic capacitance effects on brightness uniformity.
2Device complexity
If pixel driving circuits overlap with light-emitting devices to reduce circuit area, then device complexity is reduced, but signal interference occurs
Solution Approach 1:
The shielding layer acts as an intermediary that physically separates the pixel driving circuits from the light-emitting devices while maintaining electrical isolation. The isolation parts of the shielding layer are positioned between the driving circuits and the light-emitting devices, preventing direct capacitive coupling and signal interference.
Solution Approach 2:
The harmful parasitic capacitance effect is extracted and neutralized by introducing the shielding layer with isolation parts that are electrically connected to reference potential. This removes the harmful electromagnetic interaction between the overlapping circuits and light-emitting devices.
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
The solution effectively shields signal interference, maintaining uniform luminous brightness across the display, even with under-panel cameras, by using a shielding layer and optimized pixel driving circuit connections.
Implementation Method 1
a shielding layer including a plurality of isolation parts, an orthographic projection, on the base substrate, of at least one of the isolation parts at least partially overlapping an orthographic projection, on the base substrate, of at least one of the gate connecting electrodes
Data Source
AI summary
Disclosed in embodiments of the present disclosure are a display substrate, a display panel and a display device. The display substrate includes a plurality of first light-emitting devices in a first display area, a plurality of second light-emitting devices in a second display area, a plurality of first pixel driving circuits in the second display area, the first pixel driving circuits are connected with the first light-emitting devices, and the plurality of pixel driving circuit has a drive transistor; gate connecting electrodes connected to a gate electrode of the drive transistor; a plurality of traces, each of at least part of the traces being electrically connected from the first pixel driving circuits across the gate connecting electrodes to the first light-emitting devices; and a shielding layer including isolation parts, an orthographic projection of the isolation parts at least partially overlapping an orthographic projection of the gate connecting electrodes.