Under-Display Camera Sealing Layout for Higher Light Transmittance
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Solution Overview
Problem
Existing display panel sealing materials, such as polyimide, have low visible light transmittance, which deteriorates shooting image quality when used with camera modules, and making polyimide transparent compromises heat resistance and electrical characteristics.
Innovation Solution
A display device with distinct transmittance regions: a first region with low transmittance for display and a second region with higher transmittance for camera modules, using transparent films and structures like moth-eye layers to enhance light transmission without compromising heat resistance or electrical integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If polyimide is used as sealing material, then heat resistance and electrical characteristics are maintained, but visible light transmittance is low which deteriorates shooting image quality
Solution Approach 1:
The sealing structure is divided into two distinct regions: a first sealing region using polyimide for heat resistance and electrical characteristics, and a second sealing region using transparent resin for high visible light transmittance. This segmentation allows each region to optimize its material properties according to functional requirements, resolving the contradiction between heat resistance and light transmittance.
Solution Approach 2:
Different materials are applied to different regions of the sealing structure based on local functional requirements. The polyimide is applied locally where heat resistance is critical, while transparent resin is applied locally where light transmittance is critical. This local quality differentiation resolves the contradiction by allowing each region to have optimal properties for its specific function.
2Adaptability or versatility
If camera module is disposed immediately below display panel, then screen-to-body ratio is increased, but light transmittance is reduced by opaque sealing materials
Solution Approach 1:
The sealing structure uses different materials in different regions: transparent resin in the second sealing region directly above the camera module to maximize light transmittance, while polyimide in the first sealing region maintains heat resistance. This local differentiation enables high screen-to-body ratio with optimal light transmission to the camera.
Solution Approach 2:
The sealing structure employs a composite approach using two different resin materials with complementary properties: polyimide for thermal stability and transparent resin for optical clarity. This composite sealing structure simultaneously achieves high screen-to-body ratio and optimal light transmittance to the camera module.
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
Improves image quality by increasing light transmission to camera modules while maintaining display quality and electrical performance, allowing for flexible and high-transmittance display designs.
Implementation Method 1
the reflective polarizer includes a first reflective polarizer and a second reflective polarizer arranged in an inverted manner with respect to each other, each having a polarizing direction
Implementation Method 2
the reflective polarizer reflects linearly polarized light
Data Source
Figure 1~2A
Figure 2B~2D
Figure 3A~3D
AI summary
To improve transmittance without impairing display quality. A display device includes: a substrate; a first display region disposed on the substrate, the first display region having a plurality of pixels; and a second display region disposed on the substrate, the second display region having a plurality of pixels, in which the substrate has a first transmittance in the first display region, and the substrate has a second transmittance in the second display region higher than the first transmittance.