Backlight Unit Reflector Gap for LED Light Leakage Control
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Solution Overview
Problem
Conventional backlight units for large-scale LCDs, particularly those using CCFLs, face issues with high power consumption, limited color reproduction, and environmental pollution due to mercury, necessitating a more efficient and environmentally friendly solution.
Innovation Solution
A backlight unit design incorporating a first and second reflector with specific angular and spatial relationships to light sources, allowing for the reduction of yellow-white light leakage by creating a gap between the reflectors and light sources, thereby reducing power consumption and environmental impact while enhancing color reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If CCFLs are used as light sources in conventional backlight units, then the backlight unit can provide sufficient brightness for large-scale displays, but power consumption increases and environmental pollution occurs due to mercury content
Solution Approach 1:
The patent transitions from CCFL light sources to LED light sources, fundamentally changing the illumination mechanism. LEDs consume significantly less power while providing comparable or superior brightness, directly resolving the contradiction between illumination intensity and power consumption
Solution Approach 2:
The patent adopts LEDs which are environmentally friendly alternatives to mercury-containing CCFLs. Although LEDs have different operational characteristics, they eliminate the environmental pollution issue associated with mercury disposal while maintaining long service life and low power consumption
2Duration of action of stationary object
If CCFLs are used as light sources, then the backlight unit can maintain continuous operation, but color reproduction is limited to about 70% of CRT standards
Solution Approach 1:
The patent employs LED technology which offers superior color reproduction capabilities, exceeding 100% of NTSC color reproduction range specifications. This parameter change in light source technology simultaneously improves color accuracy and enables selective activation of LED arrays for power management
3Length of moving object
If the second reflector is positioned close to the light source, then the structural thickness is reduced, but yellow-white light leakage increases causing color degradation
Solution Approach 1:
The patent applies different reflector configurations at different locations: the first reflector is positioned close to the light source for structural compactness, while the second reflector is positioned at a specific distance to prevent yellow-white light leakage. This local differentiation of reflector positions resolves the contradiction between thickness reduction and color purity maintenance
Solution Approach 2:
The patent introduces an air gap as an intermediary space between the second reflector and the light source. This air gap acts as a mediator that blocks the path of yellow-white light leakage while maintaining a compact overall structure, thus preserving color purity without excessive thickness
4Use of energy by moving object
If LEDs are used instead of CCFLs, then power consumption is reduced and color reproduction is improved, but yellow-white light leakage may occur affecting overall light quality
Solution Approach 1:
The patent employs differentiated reflector positioning where the first reflector is close to the LED light source and the second reflector is positioned at a specific distance. This local quality differentiation ensures that yellow-white light leakage is prevented at critical locations, maintaining light quality while preserving the power consumption and color reproduction advantages of LEDs
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 design effectively reduces yellowing of light emitted from the backlight unit, improves power efficiency, and minimizes environmental pollution by using LEDs, which offer better color reproduction and are mercury-free.
Implementation Method 1
a first reflector, a second reflector, and at least one light source disposed between the first reflector and the second reflector
Data Source
AI summary
Disclosed are a backlight unit and a display using the same. The backlight unit includes a first reflector, a second reflector, and at least one light source disposed between the first reflector and the second reflector, and the end of the second reflector is separated from the at least one light source by a first distance in the upward direction of the at least one light source.