LED Backlight Color Temperature Tuning via Green Light Mixing
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Solution Overview
Problem
Conventional white LEDs used in backlight modules for larger liquid crystal displays, such as liquid crystal television panels, struggle to meet high color temperature requirements while maintaining cost-effectiveness, as they typically emit light with a low color temperature.
Innovation Solution
Incorporating a green light illuminant with a light power ratio between one fifth and one twentieth of the white light illuminant, either as independent LEDs or different chips/phosphors, to enhance the color temperature of the overall light output, achieving a color temperature performance of 10,000K at specific CIE chromaticity coordinates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If white LEDs with blue light chips are used to excite white fluorescent powder, then the backlight module can be made compact and energy-efficient, but the color temperature of the emitted light remains low
Solution Approach 1:
The patent changes the spectral parameters by introducing green light illuminants with specific wavelengths (520-560nm) to modify the overall color temperature of the backlight system. By adjusting the light power ratio of green illuminants relative to white illuminants, the color temperature can be tuned to achieve high color temperature performance (10,000K) while maintaining manufacturing feasibility
Solution Approach 2:
The patent creates a composite light source system combining white light illuminants and green light illuminants in specific proportions. This composite approach allows the system to achieve properties (high color temperature) that neither component alone can provide, while maintaining cost-effectiveness through optimized material selection and ratios
2Temperature
If green light illuminants are added to increase color temperature, then the color temperature performance improves, but the device complexity increases
Solution Approach 1:
The patent segments the backlight system into distinct white light illuminant modules and green light illuminant modules, each with specific functions. This segmentation allows for independent optimization of each module while maintaining overall system simplicity through modular design and standardized interfaces
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 integration of green light illuminants with white light illuminants in a controlled power ratio significantly increases the color temperature of the light emitted, meeting industrial standards for larger liquid crystal displays without significantly increasing manufacturing costs.
Implementation Method 1
a LED illuminant system includes a plurality of white light illuminants and at least one green light illuminant mixed in the white light illuminants
Implementation Method 2
The white LEDs available in market usually emit white light by exciting white fluorescent powder with a blue light chip
Data Source
AI summary
A light emitting diode (LED) illuminant system, a manufacture method thereof, and a backlight module using the same are provided. The LED illuminant system includes a plurality of white light illuminants and at least one green light illuminant mixed in the white light illuminants. A light power ratio of the green light illuminant to the white light illuminants is in between ⅕ to 1/20. The color temperature of the whole illuminant system will be enhanced to a certain extent by mixing the green light illuminant and the white light illuminants. The manufacture method includes the following steps: obtaining a transmission spectrum of the white light illuminants; analyzing the transmission spectrum to determine n supplemental amount of a green light; and disposing at least one green illuminant in accordance with the supplemental amount of the green light.