Side-Lit LED Backlight Module Without Light Guide Plate
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Solution Overview
Problem
The high heat generated by LEDs in side-lit backlight modules causes thermal warpage of the light guide plate, reducing illumination efficiency and affecting display colors, while the complex optical structure of the light guide plate increases production costs.
Innovation Solution
A side-lit LED backlight module design that eliminates the light guide plate by using a reflection plate and Fresnel lenses between the LED light source and the reflection plate, along with a diffusion light board, to provide a uniform planar output light, simplifying the optical structure and improving light energy utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a light guide plate is used in side-lit LED backlight module, then the backlight can be made thin, but thermal warpage occurs reducing illumination efficiency
Solution Approach 1:
The patent removes the light guide plate from the backlight module structure entirely. Instead of using a light guide plate to distribute light, the invention employs LED arrays directly mounted on the backlight frame, with light reflected and distributed through reflective plates and optical sheets, eliminating the component that causes thermal warpage.
Solution Approach 2:
The patent introduces reflective plates and optical sheets as intermediary components between the LED light sources and the display panel. These intermediaries distribute light uniformly without requiring a light guide plate, thereby maintaining thin profile while avoiding thermal warpage issues.
2Volume of moving object
If a light guide plate is used in side-lit LED backlight module, then the backlight can be made thin, but production cost increases due to complicated optical structure
Solution Approach 1:
The patent eliminates the complex light guide plate structure and its associated optical elements. The simplified design uses direct LED mounting with reflective plates and standard optical sheets, reducing both structural complexity and production costs while maintaining thin form factor.
Solution Approach 2:
Instead of using a light guide plate to guide light from edges to the display surface, the patent inverts the approach by placing LED arrays directly on the backlight frame and using reflective plates to redirect light upward through optical sheets, simplifying the optical path.
3Illumination intensity
If LED light source is used in side-lit backlight, then display colors are improved, but heat generation causes thermal warpage of light guide plate
Solution Approach 1:
The patent removes the light guide plate that accumulates heat and deforms under thermal stress. By using direct LED mounting with reflective plates and optical sheets, the system maintains LED's superior color performance while eliminating the thermal bottleneck caused by the light guide plate's narrow cavity.
Solution Approach 2:
The patent uses multiple LED arrays distributed across the backlight frame to replicate the light source function throughout the module, eliminating the need for a single high-power LED combined with a light guide plate, thereby reducing localized heat generation while maintaining illumination quality.
4Shape
If light guide plate is used, then side-lit configuration is achieved, but material aging causes extinction to specific light-emitting wavelength affecting display colors
Solution Approach 1:
The patent eliminates the light guide plate material that is susceptible to aging and wavelength-specific extinction. By using inorganic reflective plates and stable optical sheets without the polymer materials found in light guide plates, the system achieves side-lit configuration while improving long-term color stability.
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 enhances illumination efficiency and reduces the impact of thermal warpage on optical performance, while lowering production costs by eliminating the need for a light guide plate.
Implementation Method 1
at least one Fresnel lens disposed between the LED light source and the reflection plate
Implementation Method 2
at least one Fresnel lens disposed between the LED light source and the reflection plate
Implementation Method 3
a reflection plate configured to reflect light of the LED light source to provide a planar output light
Implementation Method 4
a light board disposed above a light-emitting surface of the backlight module to make an output light of the backlight module uniform
Data Source
AI summary
The backlight module provided by the present invention utilizes a reflection plate and a Fresnel lens disposed between the light-emitting diode (LED) light source and the reflection plate to form a side-lit LED backlight without a light guide plate, which can simplify optical structure of the backlight. From a point of view, heavy weight and high cost problems of the light guide plate is solved while improving illumination efficiency.