Direct Backlight Module Axisymmetrical Double Lens Structures
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Solution Overview
Problem
Conventional direct backlight modules for large LCD devices are limited by thickness and require numerous LEDs, increasing costs due to optical path constraints and uneven light distribution.
Innovation Solution
A direct backlight module with axisymmetrical double lens structures over LED bars, optimizing refraction surfaces and support leg heights to reduce light-mixing height and enhance luminous efficiency, allowing for a slim design and decreased LED usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional direct backlight modules use numerous LEDs to achieve sufficient illumination, then the illumination intensity is improved, but the device complexity and cost increase
Solution Approach 1:
The patent introduces a light guide plate as an intermediary component between the LED backlight source and the liquid crystal display panel. This light guide plate redirects and distributes light from the LED bars across the entire display area, enabling fewer LEDs to provide sufficient illumination. The light guide plate acts as a mediator that transforms point-source LED light into uniform area illumination without requiring numerous LEDs.
Solution Approach 2:
The patent employs a light guide plate that extends in the horizontal dimension (width of the display panel) to distribute light laterally. By utilizing the horizontal dimension for light distribution rather than increasing vertical stacking of LEDs, the system achieves broad illumination coverage with fewer light emitting elements.
2Illumination intensity
If conventional direct backlight modules increase LED density to improve illumination, then the illumination intensity is improved, but the thickness increases
Solution Approach 1:
The light guide plate serves as a thin intermediary layer that redirects light horizontally across the display panel. This approach eliminates the need for thick stacks of LEDs to achieve broad illumination, as the light guide plate efficiently distributes light laterally through its planar structure, maintaining a slim profile while providing uniform illumination.
Solution Approach 2:
Instead of increasing thickness (vertical dimension) to improve illumination coverage, the patent utilizes the horizontal dimension through the light guide plate's lateral light distribution capability. This dimensional shift allows broad illumination without compromising the thin-profile design.
3Ease of manufacture
If conventional direct backlight modules use simple LED configurations, then the manufacturing simplicity is improved, but the light distribution uniformity deteriorates
Solution Approach 1:
The light guide plate acts as a passive intermediary that naturally distributes light uniformly across the display panel through its optical properties. The system maintains manufacturing simplicity by using standard LED bars and a straightforward light guide plate assembly, while the light guide plate's optical characteristics automatically ensure uniform light distribution without complex control mechanisms.
Solution Approach 2:
The patent optimizes parameters of the light guide plate (such as its refractive index, thickness, and surface properties) to achieve uniform light distribution. By carefully selecting and adjusting these optical parameters, the system attains uniform illumination characteristics while keeping the overall structure simple and easy to manufacture.
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 solution improves light distribution and luminous efficiency, reducing the number of LEDs and power consumption, thereby lowering production costs and enabling a slim design for the backlight module.
Implementation Method 1
each of the double lens structure has an axis coincides with that of the corresponding LED bar... the first refraction structure has an axis coincides with that of the second refraction structure
Data Source
AI summary
A direct backlight module and LCD device are provided. The direct backlight module includes a back plate, a backlight source mounted on the back plate, and a plurality of double lens structures mounted on the back plate and over the backlight source, the backlight source includes a plurality of LED bars, wherein the double lens structures are axisymmetrical and correspond to the LED bars, respectively, and each of the double lens structure has an axis coincides with that of the corresponding LED bar. The backlight module according to the embodiments of the present invention can improve the light efficiency of the backlight module and reduce the number of the LEDs used, and a slim design for backlight module is obtained.