Backlight Assembly Reflecting Plate Penetration Holes
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Solution Overview
Problem
Conventional backlight assemblies for LCDs face challenges in achieving high optical efficiency while maintaining a thin thickness and reducing manufacturing costs, as they either rely on costly light guide plates in edge-illumination types or increase thickness with multiple lamps in direct-illumination types.
Innovation Solution
A backlight assembly design that eliminates the light guide plate by using a configuration of lamps, a bottom reflecting plate, and a first reflecting plate with varying penetration holes to enhance optical efficiency, combined with a diffusing plate and a printed pattern layer to improve light transmission and reduce thickness and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a light guide plate is used in edge-illumination type backlight assembly, then the thickness is reduced, but the manufacturing cost increases
Solution Approach 1:
The patent removes the light guide plate from the backlight assembly structure. Instead of using a light guide plate to distribute light, the invention uses multiple lamps directly positioned on a reflecting plate to illuminate the LCD panel, thereby eliminating the need for the light guide plate and reducing manufacturing cost while maintaining thin profile
Solution Approach 2:
The patent divides the light source into multiple separate lamps arranged in parallel on the reflecting plate, rather than using a single integrated light guide plate system. This segmentation allows direct illumination of the LCD panel from multiple points, achieving both thin thickness and reduced cost by eliminating the light guide plate
2Illumination intensity
If multiple lamps are used in direct-illumination type backlight assembly, then the brightness is improved, but the thickness and manufacturing cost increase
Solution Approach 1:
The patent positions multiple lamps on the rear surface of the LCD panel in a parallel arrangement, utilizing the depth dimension effectively. The lamps are arranged to illuminate the panel from behind without increasing the overall thickness, as they are integrated into the backlight assembly structure rather than adding external bulk
Solution Approach 2:
The patent combines multiple lamps and a reflecting plate into a single integrated backlight assembly unit. The reflecting plate serves both as a mounting surface for the lamps and as an optical element to distribute light, merging multiple functions into one compact structure that maintains thin profile while providing high brightness
3Length of stationary object
If a light guide plate is used in edge-illumination type backlight assembly, then the thickness is reduced, but the optical efficiency decreases
Solution Approach 1:
The patent uses a reflecting plate to capture and redirect light that would otherwise be lost. The reflecting plate is positioned to reflect light from the lamps toward the LCD panel, converting potentially wasted light into useful illumination, thereby improving optical efficiency without compromising the thin design
Solution Approach 2:
The reflecting plate is pre-positioned on the rear surface of the LCD panel to optimize light distribution before the light reaches the panel. This preliminary optical arrangement ensures maximum light utilization efficiency from the outset, improving optical efficiency while maintaining the thin edge-illumination profile
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 design improves optical efficiency and reduces the thickness and manufacturing costs of the backlight assembly by optimizing light transmission and distribution, allowing for a more efficient and cost-effective solution compared to traditional designs.
Implementation Method 1
a bottom reflecting plate disposed under the lamps to reflect the light
Implementation Method 2
a first reflecting plate disposed over the lamps to transmit and reflect the light
Implementation Method 3
The first reflecting plate has a plurality of penetration holes for transmitting the light
Implementation Method 4
a diffusing plate diffusing the light passing through the first reflecting plate
Implementation Method 5
A printed pattern has a plurality of penetration holes for transmitting the light. The printed pattern layer may be patterned with an ink reflecting light
Data Source
AI summary
A backlight assembly includes a plurality of lamps, a first reflecting plate and an optical member. The lamps are disposed substantially parallel with each other and generate light. The bottom reflecting plate is disposed under the lamps to reflect the light. The first reflecting plate is disposed over the lamps to transmit and reflect the light and has a plurality of penetration holes for transmitting the light. The optical member is disposed over the first reflecting plate. The formation density of the penetration holes increases as a position of the penetration holes approaches an intermediate region between adjacent lamps from a region corresponding to a position of the lamps.