Regional Low-Blue-Light Image Processing for Color Cast Control

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Solution Overview

Problem

Existing display devices do not effectively address the adverse effects of blue light on eyes, leading to a growing need for low blue light functions.

Innovation Solution

An image processing method and controller that utilize a spectrum analyzer to acquire spectrum information, calculate low blue light parameters, and apply these parameters to regions of an image based on blue light hazard intensity to reduce blue light exposure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If blue light is reduced in display devices, then eye safety is improved, but image quality deteriorates due to color cast

Engineering Contradiction:

Improveblue light hazardVSAvoidimage quality

Core Design Contradiction:

Object-affected harmful factorsVSManufacturing precision

Solution Approach 1:

The patent applies different low blue light parameters to different regions of the display based on their blue light hazard intensity. High hazard regions receive stronger blue light reduction while low hazard regions maintain better color accuracy, thus locally optimizing both eye safety and image quality

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The system dynamically adjusts display parameters (brightness, contrast, color temperature) based on measured blue light hazard intensity and user characteristics, transforming fixed parameters into adaptive ones that balance eye safety and image quality

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If low blue light parameters are applied to entire image, then blue light hazard is reduced, but image quality deteriorates due to color cast

Engineering Contradiction:

Improveblue light hazard intensityVSAvoidimage quality

Core Design Contradiction:

Object-affected harmful factorsVSManufacturing precision

Solution Approach 1:

The patent divides the display image into multiple regions with different blue light hazard characteristics and applies different processing parameters to each region, avoiding uniform processing that degrades overall image quality

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the image receive customized low blue light parameters based on their specific blue light hazard intensity, ensuring that only necessary areas are modified while preserving image quality in less problematic areas

Inventive Principle:

Principle #3Local quality

3Manufacturing precision

If blue light is not reduced, then image quality is maintained, but eye health deteriorates due to blue light exposure

Engineering Contradiction:

Improveimage qualityVSAvoidblue light hazard

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The system dynamically changes display parameters based on real-time blue light measurement and user data, adjusting the degree of blue light reduction to maintain image quality while protecting eye health

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12469474B2Image processing method, controller, and non-transitory computer readable storage medium

Publication Date: 2025.11.11 REALTEK SEMICON CORP

AI summary

An image processing method includes following operations: acquiring, by a spectrum analyzer, spectrum information of a display device; calculating, by a processor, a first low blue light parameter according to the spectrum information; transmitting, by the processor, the first low blue light parameter to the display device; calculating, by the display device, first blue light hazard intensity of a first region of input image data; and when the first blue light hazard intensity is greater than a first threshold value, applying, by the display device, the first low blue light parameter to the first region so as to output a final image.