Middle-Frame Ambient Light Sensor Layout for Full-Screen Displays
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Solution Overview
Problem
The challenge of arranging ambient light sensors in electronic devices with large screen-to-body ratios, which affects display regions and requires complex software processing and additional painting to conceal the sensors, is addressed.
Innovation Solution
The ambient light sensor is positioned within a cavity of the middle frame, utilizing a first subregion with predetermined light transmittance to detect external light without emitting functions, allowing for simplified software processing and reduced display region impact, while using a light homogenizing plate to enhance detection reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ambient light sensor is arranged on the display screen to detect external light, then the detection function is achieved, but it occupies display region and reduces screen-to-body ratio
Solution Approach 1:
The display screen is divided into a first body portion (display region) and a second body portion (non-display region). The ambient light sensor is placed in the non-display region, separating the detection function from the display function. This segmentation allows the sensor to occupy space that would otherwise be non-functional for display purposes.
Solution Approach 2:
The solution moves the ambient light sensor from the traditional front-facing position (occupying display area) to the back side of the display module. By utilizing the z-dimension (depth) rather than the x-y plane, the sensor is positioned in the second body portion without reducing the front display area, thus maintaining screen-to-body ratio.
2Reliability
If the ambient light sensor is arranged to detect external light through the display screen, then the detection function is achieved, but complex software matting algorithms are required for processing
Solution Approach 1:
The ambient light sensor is extracted from the display region and placed in the non-display region. This extraction eliminates the need for software matting algorithms that would be required to distinguish between display content and ambient light, as the sensor now directly detects external light without interference from the display screen.
3Area of stationary object
If the ambient light sensor is arranged in the non-display region, then the display region is maximized, but the sensor needs to detect light through multiple functional layers
Solution Approach 1:
A first subregion is created within the second body portion with specific light-transmitting properties. This subregion has optimized optical characteristics (such as specific functional layers with appropriate transmittance) to facilitate light passage from the external environment to the ambient light sensor, compensating for the increased path length through the display module.
4Reliability
If the first subregion has light-transmitting properties to enable external light detection, then the ambient light sensor can detect external light, but the shield function is reduced
Solution Approach 1:
The second body portion is divided into different subregions with different optical properties. The first subregion has light-transmitting properties optimized for ambient light detection, while other subregions maintain light-blocking properties for shielding. This local differentiation allows simultaneous optimization of detection and shielding functions in different areas.
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 arrangement improves the screen-to-body ratio, reduces processing complexity, and enhances detection reliability with a larger field of view, all while maintaining a sleek appearance and cost-effectiveness.
Implementation Method 1
The ambient light sensor converts a detected optical signal into an electrical signal
Implementation Method 2
the first subregion has light transmittance with a predetermined value... after passing through the first subregion, the external light can enter an internal cavity
Implementation Method 3
utilizing a light homogenizing plate to enhance detection reliability
Data Source
AI summary
An electronic device is provided. The electronic device may include any one of a handheld device, an in-vehicle device, a wearable device, a terminal device, connected to a wireless modem, a cellular phone, a smart phone, a personal digital assistant, a computer, a tablet computer, a handheld computer, and the like. In embodiments of this application, a software matting algorithm does not need to be used when a main board processes an electrical signal transmitted by an ambient light sensor so that a computing method is simple. In addition, a corresponding location of a transparent cover plate does not need to be painted with black ink, thereby simplifying a processing process of the electronic device and reducing use costs.