Under-screen Camera Ink Layer for OLED Transmittance
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Solution Overview
Problem
The existing display devices with polarizers for OLEDs have low transmittance, preventing the front camera under the screen from capturing clear images due to reduced light transmission, which limits the implementation of full-screen technology with high screen-to-body ratios.
Innovation Solution
A display device design that replaces the polarizer under the camera with a thin black ink layer allowing specific wavelengths of light (red, green, and blue) to pass through, while using an adhesive layer to secure the ink layer on a protective cover plate, ensuring high transmittance for the camera module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polarizer is used in the OLED display layer, then the display structure is complete and polarized light control is achieved, but the transmittance of the display screen is reduced to 40%-50%, causing the front camera under the screen to cannot image clearly
Solution Approach 1:
The polarizer is segmented into two parts: a first polarizer in the display area and a second polarizer in the camera area with different transmission characteristics. The second polarizer has higher transmittance to enable clear imaging by the under-screen camera while the first polarizer maintains normal display function.
Solution Approach 2:
Different regions of the display device are assigned different optical properties. The camera region uses a polarizer configuration optimized for light transmission to the camera sensor, while the display region uses a polarizer optimized for display quality, allowing each region to perform its specific function optimally.
2Illumination intensity
If the polarizer transmittance is increased to enable clear camera imaging, then the camera under the screen can image clearly, but the display quality and polarized light control are compromised
Solution Approach 1:
The polarizer is divided into distinct functional zones: a first polarizer for the display area with standard transmittance to maintain display quality, and a second polarizer for the camera area with enhanced transmittance to enable clear camera imaging, thus resolving the trade-off between display quality and camera performance.
Solution Approach 2:
The display device implements location-specific optical properties where the camera region employs a polarizer with higher transmittance characteristics while the display region maintains standard polarizer properties, allowing optimal performance for both functions without compromising overall display quality.
3Illumination intensity
If a through hole is created in the polarizer for the camera, then light transmission to the camera is improved, but the structural integrity and uniformity of the polarizer are reduced
Solution Approach 1:
Instead of creating a through-hole that compromises the polarizer structure, the polarizer is segmented into multiple polarizer layers (first and second polarizers) with different functions. This maintains the structural integrity and uniformity of each polarizer layer while achieving the light transmission needed for the camera through the coordinated arrangement of multiple layers.
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 solution enhances the display device's transmittance, enabling the camera to capture high-definition images by allowing only specific wavelengths of light to pass through, thus supporting the development of full-screen technologies with increased screen-to-body ratios.
Implementation Method 1
the ink layer transmits only red, green, and blue lights; the ink layer has a transmission width ranging from 3 to 50 nm for each of red, green and blue light wavelengths
Data Source
AI summary
A display device includes a thin film transistor (TFT) array substrate, an organic light-emitting diode (OLED) display layer, a polarizer, a protective cover, and a camera module. The polarizer is provided with a through hole, and the camera module is disposed corresponding to the through hole, wherein an ink layer is disposed on the protective cover plate and completely overlaps with the through hole are completely overlapped, and the ink layer transmits only red, green, and blue lights. By polarizer in the area corresponding to the screen camera, and replacing the removed polarizer with a black ink, the camera under a screen can image in high definition, thus being conducive to the development of a full screen.