Blue Light Wavelength Adjustment for Eye Safety
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Solution Overview
Problem
Conventional displays, particularly LCDs and OLEDs, emit blue light that can cause eye damage and chronic issues, necessitating a solution to reduce blue light exposure while maintaining image quality.
Innovation Solution
A display device and method featuring a backlight module with a blue light source having a wavelength greater than 440 nm and less than or equal to 460 nm, and a display driving circuit that corrects the blue light source based on a blue light gamma curve, along with red and green light gamma curves, to reduce blue light intensity and prevent color shifts, thereby enhancing image quality and reducing eye harm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If blue light with short wavelength (440 nm) is used in the backlight module, then the display effect is enhanced, but the harm to eyes increases
Solution Approach 1:
The patent changes the wavelength parameter of the blue light source from the conventional 440 nm to a longer wavelength range (450-470 nm), specifically selecting 460 nm as the optimal wavelength. This parameter change reduces the harmful effects on eyes while maintaining adequate display performance, directly resolving the contradiction between display effect and eye safety.
2Object-affected harmful factors
If blue light intensity is reduced to minimize eye harm, then eye safety is improved, but image quality may deteriorate
Solution Approach 1:
The patent introduces gamma curve correction specifically for the blue light channel to compensate for the reduced blue light intensity. By adjusting the gamma curve parameters, the display system maintains proper color balance and image quality even with lower blue light content, thus preventing image quality deterioration while ensuring eye safety.
Solution Approach 2:
The patent implements a feedback mechanism where the display driving circuit continuously monitors and adjusts the blue light output based on the stored gamma curve. This feedback control ensures that the blue light intensity is optimized to protect eyes while maintaining accurate color reproduction and overall image quality.
3Object-affected harmful factors
If blue light wavelength is extended beyond 480 nm to reduce eye harm, then eye safety is improved, but color accuracy deteriorates as display turns cyan
Solution Approach 1:
The patent precisely controls the blue light wavelength parameter within the range of 450-470 nm, with 460 nm as the optimal value. This precise parameter control avoids extending the wavelength beyond 480 nm which would cause cyan color shift, thereby maintaining color accuracy while still providing eye protection benefits.
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 effectively reduces the intensity of blue light emitted, preventing eye damage and maintaining image quality by adjusting the blue light source's wavelength and intensity, ensuring that the display does not shift towards cyan, thus providing a safer and more visually appealing experience.
Implementation Method 1
at least one blue light source disposed in the backlight module, a first blue light wavelength of the blue light source is greater than 440 nm and less than or equal to 460 nm
Implementation Method 2
The display driving circuit is configured (i.e., structured and arranged) to correct the blue light source according to the blue light gamma curve
Data Source
AI summary
A display device and a display driving method are provided. The display device includes a backlight module, a display panel disposed on a light emitting surface of the backlight module, at least a blue light source disposed in the backlight module, and a display driving circuit disposed on the display panel. A first blue light wavelength of the blue light source is greater than 440 nm; the display driving circuit stores a blue light gamma curve of the blue light source; the display driving circuit is used to correct the blue light source according to the blue light gamma curve.