Infrared Sensor Integration in Black Matrix for Full-Screen Displays
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Solution Overview
Problem
The development of full-screen displays in electronic devices, such as mobile phones, has reduced the available space for proximity sensors, making it challenging to maintain the strength and reliability of the bezel area while accommodating infrared light emission and reception for distance detection and backlight control.
Innovation Solution
Incorporating a light-permeable display screen with a black matrix area that includes a window region for an optical sensor, where an emitter and receiver are positioned to emit and receive infrared light through the black matrix area, allowing for distance detection without the need for a physical hole in the bezel, thus preserving the strength and improving the screen-to-body ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a physical hole is created in the bezel for infrared light transmission, then infrared detection is enabled, but the strength and reliability of the bezel area is reduced
Solution Approach 1:
The patent extracts the infrared light transmission function from the bezel structure by placing the emitter and receiver in the black matrix area. This eliminates the need for holes in the bezel, as the infrared light passes through the display screen and black matrix area where the sensor components are located, preserving bezel integrity.
Solution Approach 2:
The black matrix area acts as an intermediary medium that allows infrared light to pass through while providing structural support. Instead of creating holes in the bezel, the infrared transmission path is established through the display structure, with the black matrix area serving as the medium that enables both structural integrity and optical functionality.
2Reliability
If the black matrix area is made larger to accommodate sensor components, then sensor integration is improved, but the display area is reduced
Solution Approach 1:
The patent applies local quality by selectively positioning the sensor components in specific portions of the black matrix area. The emitter and receiver are arranged to face each other through the black matrix area, utilizing only the necessary local space for sensor functionality while leaving the rest of the black matrix area to maintain its optical shielding properties without reducing overall display area.
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 enables reliable infrared light transmission for distance detection and ambient light sensing, preventing misoperations and conserving battery power while maintaining the appearance and structural integrity of the device.
Implementation Method 1
an emitter received in the housing, arranged between the light-permeable display screen and the housing, opposed to the black matrix area, and configured to emit an infrared light through the black matrix area
Implementation Method 2
a receiver received in the housing, arranged between the light-permeable display screen and the housing, opposed to the black matrix area, and configured to receive the infrared light through the black matrix area
Data Source
AI summary
An electronic device is provided. The electronic device includes: a housing; a light-permeable display screen received in the housing and including a display area and a black matrix area surrounding the display area; an emitter received in the housing, arranged between the light-permeable display screen and the housing, opposed to the black matrix area, and configured to emit an infrared light through the black matrix area; and a receiver received in the housing, arranged between the light-permeable display screen and the housing, opposed to the black matrix area, and configured to receive the infrared light through the black matrix area.