Direct Backlight Module Light Guide Plate Thickness Reduction
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Solution Overview
Problem
Conventional direct backlight modules using LEDs as light sources face challenges in thickness, as they are more than twice as thick as those using CCFLs, hindering the thinning of liquid crystal display devices, and existing solutions do not effectively address the need for a cost-effective and thin solution.
Innovation Solution
A direct backlight module design featuring a backplane with alternately arranged LED light bars and light guide plates, supported by positioning plates made of light-transmitting materials, and a diffusion plate to enhance light utilization and mixing, reducing the number of LEDs required and module thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LED light bars are used as the light source in a direct backlight module, then the lifespan and energy efficiency are improved, but the thickness of the backlight module increases to more than twice that of CCFL-based modules
Solution Approach 1:
The backlight module is segmented into multiple functional layers: LED light bars for illumination, light guide plates for light distribution, diffusion plates for uniformity, and positioning plates for structural support. This segmentation allows each component to be optimized independently, enabling the use of thin LED structures while maintaining overall functionality.
Solution Approach 2:
The patent employs thin film structures including light guide plates and diffusion plates that are optimized for minimal thickness while maintaining their optical functions. The positioning plates use thin support sections that provide structural support without adding excessive thickness, enabling the overall module to achieve reduced thickness despite using LED light bars.
2Use of energy by stationary object
If LED light bars are used as the light source in a direct backlight module, then the energy consumption is reduced, but the thickness of the backlight module increases to more than twice that of CCFL-based modules
Solution Approach 1:
The backlight module is segmented into multiple functional layers: LED light bars for illumination, light guide plates for light distribution, diffusion plates for uniformity, and positioning plates for structural support. This segmentation allows each component to be optimized independently, enabling the use of thin LED structures while maintaining overall functionality.
Solution Approach 2:
The patent employs thin film structures including light guide plates and diffusion plates that are optimized for minimal thickness while maintaining their optical functions. The positioning plates use thin support sections that provide structural support without adding excessive thickness, enabling the overall module to achieve reduced thickness despite using LED light bars.
3Ease of manufacture
If the number of LED lights is reduced to lower manufacturing costs, then the production cost decreases, but the light output and illumination quality may be compromised
Solution Approach 1:
Light guide plates serve as intermediaries that efficiently distribute light from fewer LED light bars across the entire display area. The light guide plates use optical pathways and reflection to maximize light utilization, ensuring uniform illumination quality even with reduced LED quantities.
Solution Approach 2:
The patent incorporates diffusion plates that optimize light distribution and uniformity. These diffusion plates work with the light guide plates to ensure that even with fewer LEDs, the light output is evenly distributed across the display area, maintaining illumination quality while reducing component count.
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 light energy utilization, reduces manufacturing costs, and significantly decreases the thickness of the backlight module, facilitating the thinning of liquid crystal display devices while maintaining high image quality.
Implementation Method 1
emits light that enters a light guide plate (LGP) through a light incident face of the light guide plate and is projected out through a light emergence face of the light guide plate, after being reflected and diffused
Implementation Method 2
emits light that enters a light guide plate (LGP) through a light incident face of the light guide plate and is projected out through a light emergence face of the light guide plate, after being reflected and diffused
Implementation Method 3
emits light that enters a light guide plate (LGP) through a light incident face of the light guide plate and is projected out through a light emergence face of the light guide plate, after being reflected and diffused
Data Source
AI summary
The present invention provides a direct backlight module, which includes a backplane, a plurality of LED light bars retained on the backplane, a plurality of light guide plates arranged alternate with respect to the LED light bars, and a diffusion plate mounted on the backplane. The direct backlight module includes the light guide plates that are arranged between the LED light bars to improve utilization rate of light energy of the LED light bars so as to reduce the number of LED lights included in the LED light bars to thereby reduce the manufacturing cost. Further, the arrangement of the light guide plates effectively shortens the light mixing distance and enhances homogeneity of light illumination and also reduces the thickness of backlight module to thereby facilitate thinning of a liquid crystal display device.