Low Blue Light Backlight Module Using Wavelength Conversion
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Solution Overview
Problem
Current methods for reducing blue light in displays, such as using filters or software to decrease blue light intensity, often result in color distortion and a compromised display effect, negatively impacting user experience while attempting to protect eye health.
Innovation Solution
A low blue light backlight module comprising specific light-emitting elements with peak emission wavelengths of red, green, and blue light, utilizing wavelength conversion materials and LEDs, arranged in an array to emit white light with a controlled emission spectrum that minimizes harmful blue light while maintaining a wide color gamut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If filters or software are used to reduce blue light intensity, then eye protection is improved, but color distortion occurs and display quality deteriorates
Solution Approach 1:
The patent divides the blue light spectrum into different wavelength segments and uses multiple wavelength conversion materials with different emission characteristics to selectively convert specific blue light wavelengths while preserving others, thereby reducing harmful blue light without causing overall color distortion
Solution Approach 2:
The patent employs composite wavelength conversion materials including quantum dots and phosphors with specific emission wavelengths and narrow full width at half maximum (FWHM) to achieve precise spectral control, converting blue light to green light while maintaining color accuracy through carefully selected material properties
2Object-affected harmful factors
If blue light intensity is reduced to protect eyes, then harmful blue light exposure decreases, but overall display effect and user experience worsen
Solution Approach 1:
The patent changes the spectral parameters of the backlight by selecting wavelength conversion materials with specific emission wavelengths and narrow FWHM (60-100 nm), converting blue light (445-470 nm) to green light (510-530 nm) while maintaining overall luminance and color temperature to preserve display quality
Solution Approach 2:
The patent applies wavelength conversion selectively to specific wavelength ranges, using materials with narrow emission bands to convert only the harmful blue light portion while leaving other wavelengths unaffected, thereby maintaining local color quality in non-blue regions
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 harmful blue light exposure while preserving a high color gamut, enhancing user experience by minimizing color distortion and ensuring eye protection without compromising display quality.
Implementation Method 1
The second light-emitting element includes a second light-emitting unit and a second wavelength conversion unit. The second light-emitting unit includes a wavelength conversion material having a peak emission wavelength of 510-530 nm and a full width at half maximum (FWHM) of about 60-100 nm.
Implementation Method 2
The fourth light-emitting element includes a blue LED chip. The fourth light-emitting element is configured to emit a fourth light having a peak emission wavelength of about 445-470 nm.
Implementation Method 3
The first light-emitting element is configured to emit a first light having a peak emission wavelength of about 610-660 nm. The second light-emitting element is configured to emit a second light having a peak emission wavelength of about 520-550 nm.
Data Source
AI summary
A low blue light backlight module configured to emit a white light is provided. The low blue light backlight module includes a first light-emitting element, a second light-emitting element, a third light-emitting element and a fourth light-emitting element. The first light-emitting element is configured to emit a first light having a peak emission wavelength of about 610-660 nm. The second light-emitting element is configured to emit a second light having a peak emission wavelength of about 520-550 nm. The third light-emitting element is configured to emit a third light having a peak emission wavelength of about 480-580 nm. The fourth light-emitting element is configured to emit a fourth light having a peak emission wavelength of about 445-470 nm. The white light has an emission spectrum, and an area ratio of the spectrum under wavelength of 415-455 nm to the spectrum under wavelength of 400-500 nm is below 50%.