Under-Display Camera Light Compensation via Infrared Segmentation
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Solution Overview
Problem
The light intensity received by under-screen cameras in OLED displays is weak, hindering imaging capabilities due to low transmittance, which is currently around 40% compared to the required 80% for effective imaging.
Innovation Solution
A light compensation method and device that acquire and detect external light intensity, compensating it using internal screen light or camera sensors to ensure the camera can form images, by adjusting internal light intensity or sensor light to reach a preset threshold, thereby enhancing imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the OLED screen transmittance is increased to improve under-screen camera imaging, then the light intensity received by the camera is improved, but the screen brightness and display quality deteriorate
Solution Approach 1:
The patent segments the lighting function into two independent parts: the OLED screen's display function and the under-screen camera's lighting function. By using a separate infrared illuminator dedicated to camera illumination and an infrared sensor for receiving light, the system allows the OLED screen to maintain its normal display brightness without compromising camera imaging capability. This segmentation resolves the contradiction by enabling both high screen quality and sufficient light for under-screen camera.
2Productivity
If the screen transmittance is increased to allow more light through, then the camera imaging capability is improved, but the screen's light emission and visibility are reduced
Solution Approach 1:
The patent implements a feedback mechanism where the infrared sensor detects the amount of infrared light reflected from external objects and feeds this information back to the control unit. The control unit then adjusts the infrared illuminator's output intensity accordingly, ensuring optimal imaging conditions for the under-screen camera without affecting the OLED screen's visible light emission. This feedback loop resolves the contradiction by dynamically optimizing camera lighting independent of screen display requirements.
3Illumination intensity
If a transparent substrate is used to improve light transmission for under-screen camera, then the camera receives more light, but the structural strength and protection of the screen is reduced
Solution Approach 1:
The patent uses infrared light as a copy or alternative to visible light for the camera imaging function. By operating in the infrared spectrum rather than relying on visible light transmission through the screen, the system can use the standard opaque OLED substrate without compromising structural strength. The infrared illuminator and sensor create a parallel imaging channel that doesn't depend on the substrate's visible light transmission properties, thus resolving the contradiction between light transmission and structural strength.
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 method and device ensure the under-screen camera achieves optimal imaging effects by compensating external light intensity, improving image formation even under varying light conditions.
Implementation Method 1
the internal light is the light emitted by pixel units within the screen
Implementation Method 2
the display is an organic light emitting diode (OLED) screen
Data Source
AI summary
The present invention discloses a light compensation method and a device for a camera under a display, and the display is an organic light emitting diode (OLED) screen. The method comprises: acquiring an external light intensity sensed by the camera under the display only under an external light, wherein the external light intensity is a light intensity of the external light passing through the screen to reach the camera; and detecting whether the external light intensity can make the camera to form an image, and compensating the external light intensity according to a detection result using an internal light of the screen or a sensor of the camera.