Myopia-Safe Video Display Signal Processing
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Solution Overview
Problem
Electronic displays, such as CRTs and modern alternatives, cause myopia in children by unevenly activating red and green cones, leading to abnormal eye elongation and nearsightedness due to differential excitation of these photoreceptor cells.
Innovation Solution
The method involves adjusting video signals by decreasing the red component and increasing the green and blue components proportionally based on the differential between the red and green components, to reduce the activity difference between long and medium wavelength sensitive cones, thereby desaturating red colors and minimizing myopia induction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If standard video signals with natural red stimuli are displayed, then color accuracy and viewing experience are maintained, but differential excitation of red and green cones causes myopia progression
Solution Approach 1:
The patent modifies the video signal parameters by adjusting the red-green differential component. Specifically, it transforms the video signal to reduce the excessive activation of red cones relative to green cones, thereby changing the spectral composition parameters of the displayed light to prevent myopia while preserving overall color fidelity
Solution Approach 2:
The patent introduces an intermediary processing step between the source video signal and the display output. This intermediary transforms the video signal by adjusting the red-green differential, acting as a mediator that modifies the light composition to reduce myopia-inducing effects while maintaining color accuracy
2Object-affected harmful factors
If the red component is decreased and green/blue components are increased to reduce cone differential excitation, then myopia induction is minimized, but red color saturation is reduced
Solution Approach 1:
The patent applies parameter changes by adjusting the red-green differential in the video signal. This modifies the relative intensities of red and green components to reduce cone differential excitation while maintaining overall color saturation through balanced adjustment of the signal parameters
3Object-affected harmful factors
If video signals are modified to reduce red-green differential, then myopia-safe viewing is achieved, but signal processing complexity increases
Solution Approach 1:
The patent introduces an intermediary processing unit that transforms the video signal by adjusting the red-green differential. This intermediary component adds processing capability to existing display systems without requiring complete system redesign, thereby managing complexity while achieving myopia-safe viewing
Solution Approach 2:
The patent modifies video signal parameters through a relatively simple transformation process that adjusts the red-green differential. This approach maintains signal processing simplicity by working within the existing video signal framework rather than requiring complex hardware modifications
Data Source
AI summary
In a first aspect, the present invention provides methods for creating video signals including (a) receiving an input video signal including an input red component, an input green component, and an input blue component; (b) determining (i) that a magnitude of the input red component is greater than a magnitude of the input green component and (ii) a differential between the magnitude of the input red component and the magnitude of the input green component; and (c) sending an output video signal including an output red component, an output green component, and an output blue component, where at least one of the following is true: (i) the output red component is decreased by a fractional amount relative to the input red component based on the differential; and/or (ii) the output green component is increased by a fractional amount relative to the input green component based on the differential, and the output blue component is increased by a fractional amount relative to the input blue component based on the differential.