Backlight Module Optical Wavelength Conversion Film Uniformity
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Solution Overview
Problem
Backlight modules experience color shift due to non-uniform light reflection and conversion, leading to uneven overall light-emitting color, particularly when using blue light emitting diodes with quantum dot enhancement films and perforated reflective films.
Innovation Solution
The backlight module incorporates an optical wavelength conversion film with varying thickness and optical wavelength converter density, specifically reducing the amount and concentration of converters in regions corresponding to the light source to adjust optical wavelength conversion efficiency, thereby minimizing color shift by controlling light conversion in these areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a perforated reflective film with high reflectivity is used to adjust light transmission distribution, then light uniformity is improved, but color shift occurs due to non-uniform light conversion in different regions
Solution Approach 1:
The optical wavelength conversion film is designed with spatially varying properties: the first portion (corresponding to the light source region) has lower optical wavelength conversion efficiency, while the second portion (corresponding to non-light source regions) has higher optical wavelength conversion efficiency. This local differentiation in conversion efficiency compensates for the non-uniform light distribution caused by the perforated reflective film, thereby eliminating color shift while maintaining light uniformity.
2Adaptability or versatility
If blue light emitting diodes with quantum dot enhancement films are used to achieve wide color gamut, then color performance is improved, but color shift occurs due to excessive light conversion in regions with fewer perforations
Solution Approach 1:
The optical wavelength conversion efficiency is changed as a function of position within the film. By adjusting the concentration or type of wavelength conversion particles in different regions, the film creates a gradient or stepped variation in conversion efficiency, where the first portion converts less light and the second portion converts more light, thereby balancing the overall color output across the display area.
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
This approach ensures a uniform light-emitting color by optimizing the optical wavelength conversion efficiency in specific regions, reducing the probability of light being converted into other colors and enhancing the overall color gamut performance of the backlight module.
Implementation Method 1
The optical wavelength conversion film is suitable for receiving the first light and converting the first light into a second light with different wavelength
Data Source
AI summary
A backlight module includes a light source and an optical film group. The light source is suitable for emitting a first light. The optical film group includes an optical wavelength conversion film, which is adapted to receive the first light and to convert the first light into a second light with different wavelength. The optical wavelength conversion film includes a first portion and a second portion, wherein a quantity of the first light received per unit area of the first portion of the optical wavelength conversion film is greater than a quantity of the first light received per unit area of the second portion of the optical wavelength conversion film. Furthermore, an optical wavelength conversion efficiency of the first portion of the optical wavelength conversion film with respect to the first light is smaller than an optical wavelength conversion efficiency of the second portion of the optical wavelength conversion film with respect to the first light.