Backlight Module Corner Light Source Placement
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Solution Overview
Problem
The high cost of liquid crystal displays is attributed to the large number of expensive LEDs used in backlight modules, necessitating a reduction in the number of LEDs while maintaining sufficient brightness and even light distribution.
Innovation Solution
The backlight module design features lighting devices disposed at the intersection corners of the light guide plate's side surfaces, with each side surface having a light incident surface area less than half of its total length, allowing for a reduced number of light sources by optimizing light distribution through strategically placed light sources and reflective covers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a large number of LEDs are used in the backlight module, then sufficient brightness and even light distribution are achieved, but the manufacturing cost increases
Solution Approach 1:
The patent applies local quality by strategically placing light sources only at the four corner regions of the light guide plate rather than uniformly distributing them across the entire surface. Each corner region has a light source positioned to illuminate its adjacent side surfaces, creating localized illumination zones that collectively provide sufficient overall brightness while using far fewer light sources than traditional uniform distribution methods
Solution Approach 2:
The patent utilizes the corner intersection regions of the light guide plate, transitioning from conventional linear or surface-based light source placement to a dimensional approach that exploits the three-dimensional corner geometry. By positioning light sources at the intersections of side surfaces and utilizing the corner regions as light incident surfaces, the design achieves efficient light distribution through spatial optimization in multiple dimensions
2Quantity of substance
If the number of LEDs is reduced to lower manufacturing cost, then cost decreases, but brightness and light distribution may be compromised
Solution Approach 1:
The patent concentrates light sources at the four corner regions where side surfaces intersect, creating localized illumination zones. Each corner light source illuminates two adjacent side surfaces, and the cumulative effect of these four corner regions provides sufficient overall brightness and even light distribution across the entire light guide plate without requiring numerous individual light sources
Solution Approach 2:
The patent merges the illumination function of multiple potential light sources into four strategically positioned corner light sources. Each corner light source serves multiple purposes by illuminating two different side surfaces simultaneously, effectively combining the illumination coverage that would otherwise require many more separate light sources
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 reduces the number of LEDs required without compromising illuminance, thereby lowering manufacturing costs and improving light distribution in liquid crystal displays.
Implementation Method 1
a light guide plate 15 and two lighting devices 16
Data Source
AI summary
A back light module is provided, which includes a light guide plate, a first light source device and a second light source device. The light guide plate has a first side surface, a second side surface and a third side surface, wherein the first side surface is opposite to the third side surface, and the second side surface is orthogonal to the first and third side surfaces. The first lighting device is disposed at two sides of an intersection corner of the first and second side surfaces and faces the first and second side surfaces. The second light source device is disposed at two sides of an intersection corner of the second and third side surfaces and faces the second and third side surfaces.