Display Panel Structure for Under-Display Camera Reflection Control
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Solution Overview
Problem
Display devices face challenges in design due to the need to expose optical devices like cameras and proximity sensors, which reduces the display area and complicates the design, particularly when these devices are exposed through notches or holes in the panel.
Innovation Solution
The camera is positioned under the display panel, with a structure that includes a semi-transmissive layer, optical path compensation layer, and metal layer to manage external light reflection, ensuring the camera is not exposed and maintains high-quality imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the camera is exposed to the front surface for photographing, then the photographing function is achieved, but the display area is reduced and the design becomes complicated
Solution Approach 1:
The camera is positioned underneath the display panel, nesting the optical device within the panel structure rather than exposing it on the front surface. This allows the camera to be hidden while still functioning, maintaining full display area without compromise
2Area of stationary object
If the camera is disposed under the display panel, then the display area is maintained and design is simplified, but external light reflection between wirings and camera degrades image quality
Solution Approach 1:
The wiring structure is modified locally in the first area where the camera is positioned. A semi-transmissive layer with specific thickness (1-5 nm) and optical path compensation layer (30-120 nm) are applied only in this region to control light reflection, while other areas maintain standard wiring structures
Solution Approach 2:
The optical path compensation layer thickness is specifically controlled (30-120 nm) to compensate for the optical path difference caused by the semi-transmissive layer. This parameter adjustment prevents repeated light reflection and maintains image quality by ensuring proper light transmission to the camera
3Device complexity
If the camera is disposed under the display panel, then the camera is not exposed to the front, but high-quality imaging must be maintained
Solution Approach 1:
The wiring structure is modified locally in the first area where the camera is positioned. A semi-transmissive layer with specific thickness (1-5 nm) and optical path compensation layer (30-120 nm) are applied only in this region to control light reflection, while other areas maintain standard wiring structures
Solution Approach 2:
The semi-transmissive layer, which initially causes light reflection issues, is used beneficially by controlling its thickness to be very thin (1-5 nm). This converts the harmful reflection effect into a beneficial transmission effect, allowing light to pass through to the camera while minimizing repeated reflection
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
This configuration allows for high-quality front images and high-resolution imaging by preventing repeated light reflection between wirings and the camera, while keeping the camera hidden beneath the display panel.
Implementation Method 1
a first semi-transmissive layer positioned over the substrate
Implementation Method 2
a first optical path compensation layer positioned on the first semi-transmissive layer
Implementation Method 3
a first metal layer positioned on the first optical path compensation layer and including a first metal
Data Source
AI summary
A display device includes a display panel including a display area on which an image is displayed, a substrate, and an electrode located over the substrate and disposed in the display area; and a camera photographing a front of the display panel without being exposed to the front surface of the display panel, being disposed under the display area of the display panel, and overlapping with a first area in the display area, wherein the electrode overlaps with the first area, and wherein the electrode comprises a semi-transmissive layer positioned over the substrate, an optical path compensation layer positioned on the semi-transmissive layer, and a metal layer positioned on the optical path compensation layer.