Under-Display Camera Light Interference Prevention
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Solution Overview
Problem
The integration of an under-display camera with a display panel poses a challenge as light emitted from the display panel can reflect back into the camera, deteriorating image quality, necessitating the camera to be turned off during operation, which results in a blank notch on the screen.
Innovation Solution
Implementing a coordinated operation scheme where the display panel's light emission period and the camera's light sensing period are adjusted based on ambient light conditions, ensuring that rows of pixels are turned off during the camera's sensing periods to prevent light interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display panel is made transparent over the under-display camera to increase display area, then the display area is increased, but light from the display panel reflects back into the camera deteriorating image quality
Solution Approach 1:
The display panel and under-display camera operate in periodic time slots. The display panel emits light during its designated time period, then turns off during the camera's sensing period. This periodic switching allows both components to function without mutual interference, resolving the contradiction between maintaining display area and preventing light reflection interference.
2Measurement precision
If the portion of display panel over the under-display camera is turned off during sensing operation to prevent light interference, then image quality is improved, but the display shows a blank notch during camera operation
Solution Approach 1:
The system implements periodic time-slot operation where the display panel and camera alternate their active periods. During camera sensing, the display turns off to prevent interference and improve image quality. During display periods, the camera remains inactive. This periodic switching resolves the contradiction by allowing both high image quality and continuous display operation at different times.
3Productivity
If the under-display camera and display panel are operated simultaneously, then device functionality is maintained, but light emitted from display pixels reflects back into the camera deteriorating image quality
Solution Approach 1:
Instead of simultaneous operation, the system uses periodic time-slot allocation where the display panel and camera operate sequentially. The display panel has its own time period for light emission, and the camera has its own time period for sensing. This periodic division maintains device functionality while eliminating light reflection interference that would occur during simultaneous operation.
Data Source
AI summary
Embodiments relate to coordinating operation of an under-display camera and a portion of a display panel over the camera to reduce impact of light emitted from the display panel during light sensing periods of the under-display camera. Depending on the level of light in the surrounding of an electronic device, the light emission period of the display panel and the light sensing period of the under-display camera are adjusted. The timing of the light emission period and the light sensing period are controlled so that a row of pixels in the display panel is not in the light emission period when corresponding row or rows of sensors in the under-display camera are in the light sensing period. In this way, the under-display camera may capture images without the influence of light emitted from the display panel.