Optical Fingerprint Sensor Light Detection for Screen-to-Body Ratio
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Solution Overview
Problem
The increasing demand for a higher screen-to-body ratio in mobile terminals is hindered by the presence of a light sensor above the display, which occupies valuable space.
Innovation Solution
Integrating an optical fingerprint sensor below the display to perform light intensity detection, eliminating the need for a separate light sensor and allowing for a more compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light sensor is arranged above the display to detect ambient light intensity, then light detection accuracy is improved, but the screen-to-body ratio is reduced due to occupied front surface area
Solution Approach 1:
The patent moves the light sensor from the traditional front surface location (2D plane above display) to the back surface location (another dimension/side of the device). This dimensional relocation allows the sensor to detect light through the display structure without occupying valuable front surface area, thereby maintaining detection accuracy while increasing screen-to-body ratio.
Solution Approach 2:
The patent integrates the light sensor functionality into existing structural elements of the terminal, such as the display assembly or housing, allowing these components to serve dual purposes: both their original functions and light detection. This multi-functionality eliminates the need for a separate dedicated light sensor component on the front surface.
2Adaptability or versatility
If a separate light sensor is added to the terminal, then light intensity detection capability is improved, but device complexity increases
Solution Approach 1:
The patent merges the light sensor with existing terminal components such as the display assembly, fingerprint sensor module, or housing structure. By combining multiple functions into a single integrated component, the patent adds light detection capability without proportionally increasing overall device complexity, as the sensor shares structural and control resources with the host component.
Solution Approach 2:
The patent makes existing components multi-functional by integrating light sensing capabilities into them. For example, the display assembly or fingerprint sensor structure is designed to also serve as the light sensor mounting platform or detection element, thereby adding versatility without requiring entirely separate dedicated components for each function.
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 approach increases the screen-to-body ratio by consolidating light intensity detection functionality within the optical fingerprint sensor, reducing power consumption and enhancing user experience.
Implementation Method 1
detecting reflected light by using a plurality of sensing units
Data Source
AI summary
A light intensity detection method includes: determining whether light intensity detection needs to be performed; detecting whether there is a finger touch in an optical detection region of an optical fingerprint sensor if light intensity detection needs to be performed, wherein the optical detection region is located in at least one part of a display region of a display; enabling a light intensity detection function if no finger touch is detected, and collecting light intensity data by using the optical fingerprint sensor; and processing the collected light intensity data, and calculating a value of current ambient light intensity according to the light intensity data.