Under-Display Camera Opaque Layer Layout for Diffraction Control
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Solution Overview
Problem
The arrangement of a camera device under a display's transmission area with low pixel and wiring density causes diffraction issues, leading to non-linear modulation transfer function fluctuations and deteriorated image quality.
Innovation Solution
An electronic device with an opaque layer having openings under the display panel, where the shape, size, arrangement density, and interval of the openings are adjusted to reduce light diffraction and maintain excellent modulation transfer function characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the camera device is disposed under the transmission area of the display, then the display area can be expanded, but diffraction occurs due to low pixel and wiring density causing image quality deterioration
Solution Approach 1:
A light-shielding layer is introduced as an intermediary component between the display panel and the camera device. This layer contains light-shielding patterns that block diffracted light while allowing undiffracted light to pass through, thereby eliminating the harmful diffraction effect without compromising the expanded display area or camera functionality
Solution Approach 2:
The light-shielding layer is selectively applied only in regions where diffraction occurs, rather than covering the entire display area. The light-shielding patterns are strategically positioned to block diffracted light paths while maintaining transparency in areas where diffraction does not occur, thus preserving overall display quality and camera performance
2Object-affected harmful factors
If the camera device is disposed in the black matrix area of the cover member, then diffraction is avoided, but the display area is limited
Solution Approach 1:
The solution moves from a two-dimensional constraint (placing camera only in black matrix areas) to a three-dimensional arrangement by introducing a light-shielding layer between the display and camera. This allows the camera to be positioned under the active display area while the light-shielding layer manages the optical path to prevent diffraction
3Use of energy by moving object
If the pixel and wiring arrangement density is reduced in the transmission area, then transmittance for the camera is improved, but diffraction increases causing non-linear MTF fluctuations
Solution Approach 1:
The light-shielding patterns are designed to convert the harmful diffraction effect into a beneficial outcome. By strategically placing light-shielding features, the system uses the diffracted light paths to define precise optical boundaries, actually improving the separation between useful and harmful light while maintaining the low-density pixel arrangement needed for high transmittance
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 enhances image quality by minimizing diffraction and maintaining high modulation transfer function, resulting in improved camera performance.
Implementation Method 1
this transmission area of the display having a low arrangement density may often cause diffraction with various frequencies
Data Source
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AI summary
An electronic device is provided. The electronic device includes a housing, a display panel, and a camera device. The housing may have an inner space. The display panel may be disposed in the inner space of the housing to be visible from an outside and may include a transmission area formed as a part of an active area thereof. The camera device may be disposed under the display panel such that the transmission area of the display panel is overlapped with an angle of view of the camera device. The transmission area contains a plurality of pixels or a plurality of wirings having an arrangement density lower than in a surrounding active area when the display panel is viewed from above. The display panel may include an opaque layer disposed thereunder, having a plurality of openings, and overlapped with the transmission area when the display panel is viewed from above.