Optical Fingerprint Assembly With Integrated Color Temperature Sensing

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Solution Overview

Problem

The separate arrangement of color temperature sensors in electronic devices, such as smartphones, reduces the screen-to-body ratio and occupies valuable layout space, compromising the device's appearance and functionality.

Innovation Solution

An optical fingerprint assembly integrating a fingerprint sensor, a color temperature sensing unit, a fingerprint signal processing circuit, a color temperature signal processing unit, and a control unit, which collects and processes light signals for both fingerprint identification and color temperature detection, allowing for simultaneous functionality without the need for a separate color temperature sensor.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a separate color temperature sensor is arranged at the top of the display screen, then color temperature detection function is achieved, but the screen-to-body ratio is reduced and layout space is occupied

Engineering Contradiction:

Improvecolor temperature detection functionVSAvoidlayout space

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent combines the color temperature sensing unit with the fingerprint sensor assembly, integrating both functions into a single module. The color temperature sensing unit is positioned adjacent to the fingerprint sensor, allowing both sensors to share the same structural space and signal processing circuitry, thereby eliminating the need for separate arrangement of color temperature sensors on the display screen.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The fingerprint sensor assembly is designed to serve multiple functions: fingerprint identification and color temperature detection. By making the assembly universal, it can perform both functions without requiring additional dedicated space for color temperature sensing, thus improving space utilization while maintaining both functionalities.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If a separate color temperature sensor is arranged at the top of the display screen, then color temperature detection function is achieved, but the screen-to-body ratio is reduced

Engineering Contradiction:

Improvecolor temperature detection functionVSAvoidscreen-to-body ratio

Core Design Contradiction:

ReliabilityVSShape

Solution Approach 1:

The patent combines the color temperature sensing unit with the fingerprint sensor assembly, integrating both functions into a single module. This merging eliminates the need for separate arrangement of color temperature sensors on the display screen, thereby preserving the display area and maintaining a higher screen-to-body ratio.

Inventive Principle:

Principle #5Merging (Combining)

3Adaptability or versatility

If separate sensors are used for fingerprint identification and color temperature detection, then both functions are achieved, but device complexity increases

Engineering Contradiction:

ImprovefunctionalityVSAvoidsensor arrangement

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent merges the fingerprint sensor and color temperature sensing unit into a single integrated assembly. Both sensors share common structural components and signal processing circuits, reducing the overall device complexity while maintaining both identification and detection functionalities.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The fingerprint sensor assembly is designed as a universal module that can perform both fingerprint identification and color temperature detection. This multi-functionality approach reduces the need for separate dedicated components, thereby simplifying the overall device structure.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 integration enhances the screen-to-body ratio, optimizes the device's layout, and improves the accuracy of color temperature detection while maintaining fingerprint identification capabilities, thus enhancing user experience and development flexibility.

Implementation Method 1

a fingerprint sensor configured to collect a light signal for fingerprint identification

Methodology Applied

Scientific EffectLight reflection: Reflection

Implementation Method 2

a color temperature sensing unit configured to collect a light signal for color temperature detection

Methodology Applied

Scientific EffectLight detection: Photoelectric Effect

Data Source

PatentUS11474026B2Optical fingerprint assembly and signal processing method

Publication Date: 2022.10.18 BEIJING XIAOMI MOBILE SOFTWARE CO LTD

AI summary

An optical fingerprint assembly includes: a fingerprint sensor configured to collect a light signal for fingerprint identification; a color temperature sensing unit configured to collect a light signal for color temperature detection; a fingerprint signal processing circuit connected to the fingerprint sensor and configured to process the light signal collected by the fingerprint sensor to generate a fingerprint signal; a color temperature signal processing unit connected to the color temperature sensing unit and configured to process the light signal collected by the color temperature sensing unit to generate a color temperature signal; and a control unit connected to the fingerprint signal processing circuit and the color temperature signal processing unit, the control unit being configured to generate fingerprint information according to the fingerprint signal and to generate color temperature information of ambient light according to the color temperature signal.