Under-Display Camera Opaque Layer Layout for Diffraction Control
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Solution Overview
Problem
The increasing demand for larger display areas in electronic devices, which often requires placing camera devices under the display, leads to image quality deterioration due to diffraction issues caused by the irregular arrangement of pixels and wirings in the transmission area, resulting in non-linear modulation transfer functions.
Innovation Solution
An electronic device design that includes a display panel with a transmission area overlapped by the camera's angle of view, featuring an opaque layer with strategically arranged openings under the display panel to reduce diffraction and maintain high modulation transfer function characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the camera device is disposed under the active area of the display to expand display area, then the display area is increased, but diffraction occurs due to irregular pixel and wiring arrangement 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 includes a light-shielding pattern that blocks irregularly arranged pixels and wirings from interfering with light entering the camera, thereby preventing diffraction while allowing the camera to be positioned under the active display area
Solution Approach 2:
The light-shielding layer is segmented into a light-shielding pattern with specific transparent and opaque regions. The transparent regions allow light to pass through to the camera, while the opaque regions block light from irregular pixel and wiring arrangements, effectively segmenting the light paths to prevent diffraction
2Use of energy by moving object
If pixels and wirings are arranged at lower density in the transmission area to satisfy camera transmittance requirements, then camera transmittance is improved, but diffraction increases due to irregular arrangement structure
Solution Approach 1:
The light-shielding layer acts as a mediator that allows the transmission area to maintain lower pixel and wiring density for camera transmittance while preventing the irregular arrangements from causing diffraction. The light-shielding pattern selectively blocks light paths that would otherwise diffract
Solution Approach 2:
The light-shielding pattern provides local quality differentiation by having transparent regions where light should pass (over pixel centers) and opaque regions where light should be blocked (over wiring areas). This local differentiation allows the transmission area to maintain low density while preventing diffraction through strategic light blocking
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 effects while maintaining high modulation transfer function performance, thereby improving the camera's performance in electronic devices with expanded display areas.
Implementation Method 1
adjusting a diffraction characteristic of light incident through a transmission area of the display
Data Source
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.