Shared-Filter Color Sensor for Accurate Color Temperature Sensing

Solution Overview

Problem

Conventional color sensors face challenges in accurately interpreting color temperature due to difficulties in controlling wavelength, bandwidth, and response rate of wavebands, resulting in an interpretation error of ±25%.

Innovation Solution

A color sensor with multiple photosensitive areas and filters is designed to generate and process photosensitive signals, allowing for simplified optical coating and color temperature correction processes, enhancing interpretation accuracy by sharing filters to control wavelength and response rates.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional color sensors use separate filters for each waveband, then the spectral function can be defined, but the manufacturing precision deteriorates due to difficulty in controlling wavelength, bandwidth and response rate

Engineering Contradiction:

Improvecontrol of wavelength, bandwidth and response rateVSAvoidinterpretation accuracy of color temperature

Core Design Contradiction:

Manufacturing precisionVSMeasurement precision

Solution Approach 1:

The patent merges the filter requirements by having two wavebands (X1 and X2) share a common filter coating. Instead of applying separate filters for each waveband, a single filter coating is applied that defines both spectral functions, reducing the number of coating operations from two to one and eliminating the need for precise alignment and independent control of multiple filters.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The filter coating serves multiple functions simultaneously by defining the spectral characteristics for both waveband X1 and waveband X2. A single filter layer with specific optical properties enables both wavelength selections, making the filter universal for multiple detection channels rather than requiring dedicated filters for each channel.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Device complexity

If separate filter coatings are applied for each waveband, then the spectral function can be defined, but the device complexity increases due to multiple coating operations

Engineering Contradiction:

Improvenumber of coating operationsVSAvoidinterpretation accuracy of color temperature

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent merges the filter requirements by having two wavebands (X1 and X2) share a common filter coating. Instead of applying separate filters for each waveband, a single filter coating is applied that defines both spectral functions, reducing the number of coating operations from two to one and eliminating the need for precise alignment and independent control of multiple filters.

Inventive Principle:

Principle #5Merging (Combining)

3Ease of manufacture

If conventional color sensors use multiple independent filters, then each waveband can be detected, but the ease of manufacture deteriorates due to complex coating process control

Engineering Contradiction:

Improvefilter coating processVSAvoidcontrol of wavelength, bandwidth and response rate

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent merges the filter requirements by having two wavebands (X1 and X2) share a common filter coating. Instead of applying separate filters for each waveband, a single filter coating is applied that defines both spectral functions, reducing the number of coating operations from two to one and eliminating the need for precise alignment and independent control of multiple filters.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The filter coating serves multiple functions simultaneously by defining the spectral characteristics for both waveband X1 and waveband X2. A single filter layer with specific optical properties enables both wavelength selections, making the filter universal for multiple detection channels rather than requiring dedicated filters for each channel.

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

The solution improves the interpretation accuracy of color temperature by simplifying the manufacturing process and optical coating formula, enabling precise color coordinate calculation on the CIE color space.

Implementation Method 1

The color sensor is provided with at least three photosensitive areas and used for generating at least three photosensitive signals

Methodology Applied

Scientific EffectPhotoelectric effect: Photoelectric Effect

Data Source

PatentUS12540854B2Color sensor and color sensing device

Publication Date: 2026.02.03 LITE ON TECH CORP

AI summary

A color sensing device including a color sensor and a processing unit is provided. The color sensor is provided with at least three photosensitive areas and used for generating at least three photosensitive signals. The processing unit is connected to the color sensor and used for processing the at least three photosensitive signals to correspondingly generate at least three color signal tuples CIE(X,Y,Z). Two of the at least three color signal tuples CIE(X,Y,Z) share one of the photosensitive signals.