Standardized LED Boards for Uniform Backlight Illumination
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Solution Overview
Problem
Existing backlight devices for large image display devices, such as TVs, face challenges in thinning and weight reduction while maintaining effective LED light distribution and heat management, leading to potential luminosity unevenness and reduced product lifetime.
Innovation Solution
The implementation of standardized LED boards with equal lengths on long and short sides of a light guide plate, alternately misaligned to prevent overlap, allows for uniform LED light distribution and efficient heat dissipation across the four sides of the backlight device, reducing the thickness and weight of the display device while extending its lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LED boards of different lengths are used to cover all four sides of the light guide plate, then the light distribution can be optimized for each side, but the manufacturing complexity and cost increase due to needing multiple types of LED boards
Solution Approach 1:
The light guide plate is divided into four sides, and LED boards are segmented and arranged along each side. Each LED board is positioned to cover a specific side, with multiple LED boards per side arranged in sequence. This segmentation allows standardized LED boards to be systematically distributed across the entire light guide plate, achieving uniform light distribution without requiring custom-sized boards for each side.
Solution Approach 2:
A single type of standardized LED board is designed to serve multiple functions by being reused across all four sides of the light guide plate. The universal LED board design eliminates the need for different board types, simplifying manufacturing while maintaining effective light distribution through proper arrangement and positioning of the standardized units.
2Length of stationary object
If LED boards are arranged closely to reduce device thickness, then the backlight device can be thinned, but heat radiation becomes more difficult due to limited space for heat dissipation structures
Solution Approach 1:
Heat radiation is addressed by transitioning from a two-dimensional planar arrangement to a three-dimensional structure. Heat radiation plates are positioned at inclined angles relative to the LED boards, creating a spatial arrangement that enables effective heat dissipation in the vertical dimension. This angular positioning allows heat to be radiated away from the compact LED assembly without increasing the horizontal footprint, thus maintaining thin profile while improving thermal management.
Solution Approach 2:
The heat radiation system is segmented into multiple heat radiation plates, each associated with specific LED boards. These plates are arranged at different positions and angles to create distributed heat dissipation pathways. The segmented approach allows heat from multiple LED sources to be managed independently and efficiently, preventing heat accumulation in the compact thin structure.
3Device complexity
If LEDs are concentrated on specific sides of the light guide plate, then the structure can be simplified, but the light uniformity deteriorates due to uneven LED distribution
Solution Approach 1:
The LED arrangement is segmented into four distinct groups, with each group positioned along one side of the light guide plate. Each side receives light from its dedicated LED boards, ensuring that all four sides contribute equally to illuminating the display surface. This segmented side-by-side arrangement maintains structural simplicity while achieving uniform light distribution across the entire display area.
Solution Approach 2:
The LED boards on opposite sides of the light guide plate are arranged asymmetrically with intentional misalignment. The LED boards on one side are positioned at different longitudinal positions compared to those on the opposite side, creating an alternating pattern. This asymmetric arrangement prevents overlapping light patterns from opposing LEDs, ensuring uniform light distribution across the display surface while maintaining a relatively simple overall structure.
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 solution enables the thinning and edge-narrowing of image display devices, improves LED light uniformity, and extends the product's lifetime by dispersing heat effectively and reducing the concentration of heat sources, thereby enhancing the overall efficiency and longevity of the backlight system.
Implementation Method 1
LED boards which are arranged facing end surfaces of side surface portions of the light guide plate and on which LEDs introducing light to the light guide plate are mounted
Data Source
AI summary
A backlight device, where expense reduction is promoted by standardizing lengths of LED boards to one type. The backlight device includes: a light guide plate; and LED boards which are arranged facing end surfaces of side surface portions of the light guide plate and on which LEDs introducing light to the light guide plate are mounted, wherein lengths of long sides of the LED boards arranged on long sides facing end surfaces in a long side direction of the light guide plate and lengths of long sides of the LED boards arranged on short sides facing end surfaces in a short side direction of the light guide plate are all the same.