Backlight Module Light Guide Plate Dot Array Scattering
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Solution Overview
Problem
Conventional backlight modules face issues with hotspot and collimated light, which affect luminous quality and increase manufacturing costs, particularly due to the need for multiple light sources and the difficulty in cutting light guide plates with R-cuts or V-cuts for miniaturization.
Innovation Solution
A backlight module with a light guide plate featuring a special pattern formed by a manufacturing method using a round knife with a fixed radius of curvature, creating irregular curves on the light exit surface to scatter light uniformly and prevent collimated light, combined with an optical layer for improved light divergence and aesthetic appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple light sources are used to reduce light source spacing, then luminous quality is improved, but manufacturing cost increases
Solution Approach 1:
The light guide plate is segmented with dot arrays that divide and scatter light from fewer light sources, achieving uniform illumination without requiring multiple light sources across the entire panel
Solution Approach 2:
The dot array structure acts as an intermediary between the light source and the display panel, scattering light to eliminate hotspots and achieve uniform luminous quality without needing additional light sources
2Device complexity
If light source spacing is increased to reduce the number of light sources, then manufacturing cost is reduced, but hotspot problem occurs
Solution Approach 1:
The dot array is strategically positioned in specific regions of the light guide plate to locally scatter light and eliminate hotspots, allowing fewer light sources while maintaining uniform illumination
Solution Approach 2:
The dot array serves as a light scattering intermediary that redistributes light from spaced-out sources, preventing hotspot formation without requiring dense light source arrangement
3Illumination intensity
If R-cut or V-cut is applied to light guide plate to solve hotspot problem, then luminous quality is improved, but manufacturing cost increases
Solution Approach 1:
The patent uses a cost-effective dot array pattern that can be easily manufactured through printing or molding, replacing expensive precision cutting processes like R-cut or V-cut
Solution Approach 2:
The invention changes the approach from geometric cutting (R-cut/V-cut) to surface pattern modification (dot array), achieving hotspot elimination through a different physical mechanism that is cheaper to manufacture
4Illumination intensity
If lenticular layer is added to light guide plate to solve hotspot problem, then luminous quality is improved, but collimated light phenomenon occurs
Solution Approach 1:
The dot array uses asymmetric scattering geometry where light is scattered in multiple directions rather than being collimated, breaking the parallel light paths that cause the collimated light phenomenon
Solution Approach 2:
The dot array structure creates curved light paths through spherical scattering centers, diverging light in multiple directions rather than maintaining collimated straight-line propagation
5Device complexity
If injection light guide plate is used to make R-cut or V-cut, then manufacturing cost is reduced, but miniaturization is hindered
Solution Approach 1:
The dot array pattern can be directly molded or printed onto thin light guide plates, eliminating the need for complex post-processing cuts and enabling miniaturization without increasing manufacturing difficulty
Solution Approach 2:
The invention transitions from requiring thick plates for mechanical cutting to enabling thin plate fabrication through surface patterning, allowing miniaturization while maintaining hotspot elimination functionality
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 effectively addresses hotspot and collimated light issues while reducing manufacturing costs by uniformly scattering light and enhancing display quality through the use of a specially patterned light guide plate and optical layer.
Implementation Method 1
after the light source incidences to the light guide plate, the total reflection is destroyed by dot array, to scatter the light source out of the light guide plate
Data Source
AI summary
The present invention relates to a backlight module, a display comprising thereof and a method for manufacturing a light guiding plate. The backlight module comprising: a housing; a light guiding plate disposed in the housing, and the light guiding plate comprises a light entrance surface, a bottom surface, and a light exit surface; and a light source disposed adjacent the light entrance surface of the light guiding plate, wherein a horizontal cross section of the light exit surface of the light guiding plate has a first curve, and a vertical cross section of the light exit surface of the light guiding plate through any peak of the first curve has a second curve, wherein adjacent peaks of the first curve have a same distance therebetween, and adjacent troughs of the first curve are spaced apart by first distances.