Display Backlight Wavelength Filter for Higher Light Utilization
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Solution Overview
Problem
Existing illumination devices, particularly those used in liquid crystal display devices, suffer from inefficiencies in utilizing light, leading to suboptimal power consumption and brightness.
Innovation Solution
Incorporating a wavelength selective filter that transmits light of a first wavelength and reflects light of a second wavelength, combined with a luminescent body that converts the first wavelength to the second, enhances light utilization efficiency by allowing the first wavelength to pass through and reflecting the converted second wavelength back for effective utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conventional illumination device uses a single light source and direct luminescent conversion, then the structure is simple, but the light utilization efficiency is low and power consumption is high
Solution Approach 1:
The illumination device is segmented into multiple functional layers: a light source layer, a wavelength selective filter layer, and a luminescent body layer. This segmentation allows each component to perform its specific function optimally - the light source generates initial light, the filter separates wavelengths, and the luminescent body converts wavelengths - thereby improving overall light utilization efficiency while maintaining reasonable structural complexity
Solution Approach 2:
The patent introduces a wavelength dimension to the light utilization process by using a wavelength selective filter that transmits certain wavelengths while reflecting others. This dimensional approach allows the system to utilize both transmitted and reflected light paths, effectively doubling the light utilization efficiency without significantly increasing structural complexity
2Illumination intensity
If multiple light sources are used to improve brightness, then the brightness increases, but the cost and device complexity increase
Solution Approach 1:
Instead of increasing the number of light sources, the patent changes the wavelength parameter of light through the luminescent body conversion process. The wavelength selective filter reflects converted wavelengths back to the luminescent body for re-conversion, effectively multiplying the light output from a single light source and achieving higher brightness without additional light sources or increased cost
3Use of energy by moving object
If a wavelength selective filter is added to improve light utilization efficiency, then the efficiency improves, but the device complexity increases
Solution Approach 1:
The wavelength selective filter enables continuous useful action by reflecting converted wavelengths back to the luminescent body for further conversion rather than allowing them to be lost. This creates a continuous cycle of light conversion and utilization, maximizing the extraction of energy from the initial light source and improving overall efficiency without requiring complex additional components
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 configuration improves light emission efficiency, reduces power consumption, and enhances brightness by effectively utilizing both wavelengths, while also reducing the number of light sources needed, thus lowering costs.
Implementation Method 1
a luminescent body that is configured to wavelength-convert the light of the first wavelength to light of a second wavelength
Implementation Method 2
a wavelength selective filter that is provided on a light-incident side of the luminescent body, the wavelength selective filter being configured to transmit the light of the first wavelength and to reflect the light of the second wavelength
Data Source
AI summary
Provided is an illumination device that makes it possible to enhance utilization efficiency of light, and a display device that includes the illumination device. The illumination device includes: a light source that is configured to generate light of a first wavelength; a luminescent body that is configured to wavelength-convert the light of the first wavelength to light of a second wavelength, the second wavelength being different from the first wavelength; and a wavelength selective filter that is provided on a light-incident side of the luminescent body, the wavelength selective filter being configured to transmit the light of the first wavelength and to reflect the light of the second wavelength.