Under-Display Camera Area Layout With Moisture-Blocking Encapsulation
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Solution Overview
Problem
Conventional display devices face issues with increased non-pixel areas due to camera, speaker, and sensor placement outside the pixel area, leading to reduced pixel area and potential moisture permeation, which degrades imaging quality and transmittance.
Innovation Solution
A display device with a see-through area for the camera within the pixel area, utilizing a routing area for data and scan lines, a touch panel with a metal mesh structure, and inorganic encapsulation layers to seal and enhance transmittance, while minimizing the size of the see-through area and preventing moisture permeation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a through-hole is formed in the display device to improve the transmittance of the see-through area for camera, then the transmittance is improved, but moisture may permeate into pixels around the see-through area for camera, which may cause defects
Solution Approach 1:
The patent employs a multi-layer encapsulation structure including inorganic encapsulation layers and organic encapsulation layers that conformally cover the see-through area. These thin film layers provide moisture barrier protection while maintaining optical transmittance, resolving the contradiction between improving transmittance and preventing moisture permeation.
Solution Approach 2:
The patent uses composite encapsulation structures combining inorganic materials (such as silicon nitride, silicon oxide) and organic materials (such as polyimide, acrylic resin). This composite approach leverages the low water vapor transmission rate of inorganic layers and the flexibility and adhesion of organic layers to simultaneously achieve high transmittance and effective moisture protection.
2Area of stationary object
If the see-through area for camera overlaps pixels of the display device, then the non-pixel area is reduced, but the imaging quality of the camera may be degraded
Solution Approach 1:
The patent implements local quality by creating a see-through area with specific optical characteristics within the pixel region. The encapsulation layers in this local area are designed with different properties (higher transmittance) compared to other pixel areas, allowing the camera to capture clear images while the rest of the display maintains normal pixel functionality.
Solution Approach 2:
The patent segments the pixel area into distinct regions: the see-through area for camera placement and the surrounding pixel areas for display. This segmentation allows independent optimization of each region - the see-through area is designed for maximum light transmission while surrounding pixels maintain their display function, thus preserving both pixel area and imaging quality.
3Adaptability or versatility
If a touch panel having a metal mesh structure is provided on the see-through area for camera, then the touch function is provided, but the aperture ratio, e.g., transmittance, of the see-through area for camera may be degraded
Solution Approach 1:
The patent uses ultra-thin transparent conductive films or metal mesh structures with minimal thickness in the see-through area. These thin films provide necessary touch sensing functionality while minimizing light blocking, thus maintaining high aperture ratio. The encapsulation layers are also designed to be thin and transparent to further minimize impact on light transmission.
Data Source
AI summary
A display device according to an embodiment of the present disclosure includes a see-through area for camera in which a camera module is disposed, a routing area disposed around the see-through area for camera and overlapped by at least one data line and scan line, and a pixel area which includes the see-through area for camera and the routing area and includes a plurality of sub-pixels including an organic light emitting element and a cathode is disposed therein.