Backlight Module With Non-Forward LEDs For Uniform Illumination
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Solution Overview
Problem
Conventional backlight modules suffer from non-uniform brightness due to the directional nature of LEDs, leading to dark areas on display panels and increased costs from multiple light bars and LEDs, which are also prone to breakage.
Innovation Solution
A backlight module design featuring a reduced number of lighting bars with each bar equipped with an LED forward light source and at least one pair of non-forward light sources, packaged with an optical lens to form a diffusion light shape on the diffusion plate, allowing for adjustable light direction and intensity to achieve uniform illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple light bars and LEDs are installed to improve uniformity of light irradiation, then the uniformity of backlighting is improved, but the cost, weight, and volume of the backlight module increase
Solution Approach 1:
The patent utilizes the sidewalls of the light guide plate as a reflective surface to redirect light from the bottom surface, effectively using the vertical dimension to improve light distribution uniformity without adding more horizontal light sources
Solution Approach 2:
The light guide plate acts as an intermediary element that receives light from LEDs at the bottom and redistributes it uniformly across the display area through its reflective sidewalls and light-diffusing structure
2Device complexity
If slender light tubes are used to reduce the number of components, then the cost and complexity are reduced, but they are costly to produce and easy to break
Solution Approach 1:
The patent extracts the reflective function from separate reflective plates and integrates it into the light guide plate structure itself, eliminating the need for additional fragile components
Solution Approach 2:
The light guide plate combines multiple functions: light transmission, light diffusion, and light reflection (through its sidewalls), replacing what would traditionally require separate components
3Illumination intensity
If reflective plates are installed to improve light distribution, then the uniformity of illumination is improved, but the manufacturing complexity and assembly difficulty increase
Solution Approach 1:
The reflective function is merged into the light guide plate structure, which is a single integrated component that can be manufactured as one piece, eliminating the need for separate reflective plate assembly
Solution Approach 2:
The light guide plate serves multiple functions simultaneously: guiding light from the bottom, diffusing light across the display area, and reflecting light from its sidewalls, replacing multiple specialized components
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 light intensity in dark areas, reduces the overall weight, volume, and cost of the backlight module by minimizing the number of LEDs and light bars, while ensuring uniform backlighting across the display panel.
Implementation Method 1
the light emitted from the LED forward light source and the light emitted from the at least one pair of LED non-forward light source are combined to form a diffusion light shape on the diffusion plate
Data Source
AI summary
A backlight module is provided, including a back plate, a diffusion plate, multiple lighting bars mounted on the back plate and at least one lighting module mounted on each of the lighting bars, where each of the lighting modules has an LED forward light source and at least one pair of LED non-forward light sources, and the pair of LED non-forward light sources is mounted on the side of the LED forward light source, and light emitted from the LED forward light source and light emitted from each of the pair of LED light sources are spliced together to form a diffusing light shape. Therefore, the backlight module of the present invention has reduced lighting bars to decrease the weight, volume and cost of the whole backlight module and liquid-crystal display device, and overcome the problems of non-uniform brightness of conventional backlight modules.