Backlight Light Reduction Portion for Color Uniformity
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Solution Overview
Problem
Existing illumination devices using wavelength conversion materials for backlighting in liquid crystal displays face issues with color unevenness, reliability degradation due to heat and humidity, and increased costs, particularly with quantum dot phosphors.
Innovation Solution
Incorporating a first light reduction portion, such as a light reflective portion made of white resin with dispersed particles, in a frame shape to reduce light amounts and mitigate color unevenness, thereby eliminating the need for wavelength conversion materials and maintaining reliability and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If wavelength conversion material is used to suppress color unevenness, then color uniformity is improved, but reliability decreases due to heat and humidity degradation
Solution Approach 1:
The patent extracts and removes the wavelength conversion material from the system entirely. Instead of using quantum dot phosphor or other wavelength conversion materials on the reflective sheet, the invention uses a light reflective portion made of white resin with light-reflecting particles to redirect light, thereby eliminating the reliability issues associated with wavelength conversion materials while still addressing color unevenness.
Solution Approach 2:
The patent replaces expensive and unreliable quantum dot phosphor with a simpler, more reliable white resin composition containing light-reflecting particles. This substitute material is more stable under heat and humidity conditions, effectively using a simpler, more durable solution to achieve the same functional goal of suppressing color unevenness.
2Manufacturing precision
If wavelength conversion material is applied to the reflective sheet, then color unevenness is suppressed, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive wavelength conversion materials with a cost-effective white resin composition containing light-reflecting particles. This simpler material system reduces manufacturing costs while maintaining the ability to suppress color unevenness in the backlight device.
Solution Approach 2:
By removing the wavelength conversion material application step entirely and replacing it with a light reflective portion made of white resin, the patent eliminates the associated manufacturing costs and process complexity, achieving color uniformity through a more economical approach.
3Manufacturing precision
If light reflective portion is added to reduce light amount, then color unevenness is suppressed, but device complexity increases
Solution Approach 1:
The patent merges the light reflective portion with the existing wavelength conversion sheet or positions it in close integration within the backlight assembly. By combining these functions into a closely integrated structure rather than completely separate components, the device complexity increase is minimized while still achieving effective suppression of color unevenness.
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 suppresses color unevenness and maintains reliability while reducing costs by reflecting excess light and eliminating the need for wavelength conversion materials, ensuring consistent illumination without compromising brightness or image quality.
Implementation Method 1
the first light reduction portion may be a light reflective portion configured to reduce a light amount by reflecting incident light
Implementation Method 2
a wavelength conversion sheet configured to perform wavelength conversion on light from the light source
Data Source
AI summary
An illumination device includes a light source, a wavelength conversion sheet configured to perform wavelength conversion on light from the light source, and a first light reduction portion disposed in a frame shape as a whole overlapping an outer peripheral portion of the wavelength conversion sheet in a plan view between the light source and the wavelength conversion sheet, and configured to reduce a light amount of incident light.