Backlight Unit Reflector Inclined Surface Light Diffusion
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Solution Overview
Problem
Conventional backlight units for LCDs, particularly those using CCFLs, face issues such as high power consumption, low color reproduction efficiency, and environmental pollution due to mercury usage, while LED-based units are expensive and limited to high-end products due to complex driving mechanisms.
Innovation Solution
A backlight unit design incorporating an optical member, a reflector with an inclined surface, and a light source, where the reflector is spaced apart from the optical member and features a bracket with a recess for the light source, enhancing light diffusion and reflection efficiency while reducing weight and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CCFLs are used as light sources in backlight units, then stable light emission is achieved, but power consumption increases and color reproduction efficiency decreases to about 70% of CRT
Solution Approach 1:
The patent changes the light source from CCFL to LED, fundamentally altering the operating parameters including power consumption, lifespan, and color emission characteristics. LEDs consume significantly less power while providing stable light emission and superior color reproduction capabilities.
Solution Approach 2:
The patent adopts LEDs which, although having different operational characteristics, offer longer lifespan and lower operating costs despite requiring different driving mechanisms. The simplified structure without complex drivers makes the overall system more cost-effective.
2Reliability
If CCFLs are used as light sources in backlight units, then stable light emission is achieved, but color reproduction efficiency is limited to about 70% of CRT
Solution Approach 1:
The patent changes the light source from CCFL to LED, fundamentally altering the operating parameters including power consumption, lifespan, and color emission characteristics. LEDs consume significantly less power while providing stable light emission and superior color reproduction capabilities.
Solution Approach 2:
The patent utilizes the inherent color emission properties of LEDs, which can be manufactured to emit specific wavelengths including red, green, and blue colors. This enables color reproduction exceeding 100% of the NTSC standard, a significant improvement over CCFL's 70% of CRT.
3Ease of manufacture
If CCFLs are used as light sources in backlight units, then conventional design is maintained, but environmental pollution occurs due to mercury usage
Solution Approach 1:
The patent adopts LEDs which, although having different operational characteristics, offer longer lifespan and lower operating costs despite requiring different driving mechanisms. The simplified structure without complex drivers makes the overall system more cost-effective.
Solution Approach 2:
The patent eliminates the harmful mercury substance from the backlight unit by replacing CCFL with LED. This conversion transforms the harmful design into a beneficial environmental solution, as LEDs contain no mercury and are environmentally friendly while maintaining manufacturing simplicity.
4Use of energy by moving object
If LEDs are used in backlight units, then power consumption is reduced and color reproduction is improved, but expensive drivers and PCBs are required
Solution Approach 1:
The patent extracts and eliminates the complex driver circuitry and PCB components from the backlight unit. By using LEDs in a configuration that leverages their self-luminous properties and simplified control requirements, the design removes the expensive and complex driving mechanisms that typically accompany LED implementations.
Solution Approach 2:
The patent designs the backlight unit so that the LED array serves multiple functions: light emission, color reproduction, and simplified control. The reflector and optical members are designed to work seamlessly with the LEDs, creating a universal system that achieves high performance without requiring specialized expensive components.
5Illumination intensity
If LEDs are used in backlight units, then color reproduction beyond 100% of NTSC is achieved, but expensive drivers and PCBs are required
Solution Approach 1:
The patent extracts and eliminates the complex driver circuitry and PCB components from the backlight unit. By using LEDs in a configuration that leverages their self-luminous properties and simplified control requirements, the design removes the expensive and complex driving mechanisms that typically accompany LED implementations.
Solution Approach 2:
The patent utilizes the inherent color emission properties of LEDs, which can be manufactured to emit specific wavelengths including red, green, and blue colors. This enables color reproduction exceeding 100% of the NTSC standard, a significant improvement over CCFL's 70% of CRT.
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 achieves improved light efficiency, reduced power consumption, and environmental friendliness, enabling mass production of lightweight backlight units with uniform luminance and enhanced economic efficiency.
Implementation Method 1
a reflector spaced apart from the optical member and partially having an inclined surface
Data Source
AI summary
A backlight unit and a display apparatus using the same are disclosed. The backlight unit includes an optical sheet, a reflector having a reflective surface spaced apart from the optical sheet and having an inclined surface, a fixture connected to one side of the reflector, and a light source disposed to one side of the reflector.