Backlight Unit Sloped Reflective Portion Uniform Brightness
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Solution Overview
Problem
Conventional LCD backlight units, particularly those using CCFLs, face issues with high power consumption, limited color reproduction, and environmental concerns, while LED-based units are expensive due to complex driving mechanisms and require costly drivers and PCB boards, limiting their application to high-end products.
Innovation Solution
A backlight unit design featuring a light source module positioned between two reflective portions with a sloped surface, allowing for uniform light distribution and simplification of the structure, utilizing LED light sources and a cover frame to support the reflective and light source modules, which reduces production costs and weight while enhancing brightness uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LED light sources are used in backlight units, then power consumption is reduced and color reproduction is improved, but driving mechanisms and PCB boards become expensive
Solution Approach 1:
The patent extracts and removes the expensive driving mechanisms and PCB boards from the backlight unit structure. By using a reflective portion with integrated air guides that utilize natural convection currents, the design eliminates the need for complex electronic driving circuits and control boards, thereby reducing device complexity and cost while maintaining LED power efficiency and color reproduction benefits
Solution Approach 2:
The reflective portion is designed with built-in air guides that harness natural convection currents generated by heat from the LED light sources. This self-service mechanism uses the LEDs' own heat output to drive air flow for cooling and light distribution, eliminating external control systems and reducing overall system complexity
2Ease of operation
If complex driving mechanisms are added to LED backlight units, then light control is improved, but production cost increases
Solution Approach 1:
The patent removes complex light control mechanisms by designing a reflective portion with integrated air guides that provide passive optical control. The structure uses natural convection and geometric reflection patterns to achieve uniform light distribution without requiring expensive control circuits, drivers, or PCB boards, thereby reducing production costs while maintaining adequate light control functionality
Solution Approach 2:
The design replaces expensive, complex driving mechanisms with a simple, cost-effective reflective structure made from inexpensive materials. This approach accepts good-enough light control performance achieved through passive geometric design rather than active electronic control, significantly reducing manufacturing costs for mass production
3Illumination intensity
If additional mechanical units are added to achieve uniform brightness, then brightness uniformity is improved, but device complexity and weight increase
Solution Approach 1:
The patent merges the functions of light reflection and air flow guidance into a single integrated reflective portion structure. The air guides are formed as integral parts of the reflective surface geometry, combining optical and thermal management functions into one component, thereby achieving uniform brightness without adding separate mechanical units, reducing device complexity and weight
Solution Approach 2:
The patent achieves brightness uniformity by utilizing the third dimension (vertical air flow) rather than adding complex mechanical units in the horizontal plane. The air guides create convection currents that rise vertically to distribute heat and influence light reflection patterns, providing uniform illumination through spatial dimensionality rather than mechanical complexity
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 uniform brightness without additional mechanical units, reducing production costs and weight, and improves the economy and reliability of the backlight unit, making it suitable for a wider range of LCD products.
Implementation Method 1
a second reflective portion arranged spaced a second distance which is greater than the first distance away from the other side of the light source module to have at least a portion with a sloped surface for reflecting the light toward the open region of the first reflective portion
Implementation Method 2
a first reflective portion arranged spaced a first distance away from one side of the light source module to have an open region... to have an air guide for providing a light of uniform brightness
Data Source
AI summary
The present invention relates to a backlight unit having a reflective portion, including a light source module for emitting a light, a first reflective portion arranged spaced a first distance away from one side of the light source module to have an open region, and a second reflective portion arranged spaced a second distance which is greater than the first distance away from the other side of the light source module to have at least a portion with a sloped surface for reflecting the light toward the open region of the first reflective portion.