Edge Type Backlight Unit Light Guide Plate Elimination
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Solution Overview
Problem
Existing edge type backlight units rely on a light guide plate for light guidance, which is heavy and costly, limiting weight reduction and manufacturing cost savings, and affecting brightness uniformity and exterior quality.
Innovation Solution
The edge type backlight unit eliminates the light guide plate by utilizing a reflecting plate with a straight and inclined section, a diffusion plate with specific surface roughness, and a prism sheet with a mountain angle between 95 to 135 degrees to achieve equivalent light guiding functionality, allowing for a slimmed-down design and improved exterior quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light guide plate is used to guide light from the lateral portion in a display panel direction, then light guiding function is achieved, but weight and manufacturing cost increase
Solution Approach 1:
The patent removes the light guide plate from the backlight unit structure and redistributes its light guiding function to other existing components (reflecting plate, diffusion sheet, prism sheet), thereby eliminating the heavy component while maintaining optical performance
Solution Approach 2:
The patent makes multiple components serve dual functions: the reflecting plate provides both reflection and light guiding, the diffusion sheet provides both diffusion and light guiding, and the prism sheet provides both light collection and guiding, replacing the dedicated light guide plate function
2Reliability
If a light guide plate is used to guide light from the lateral portion in a display panel direction, then light guiding function is achieved, but manufacturing cost increases
Solution Approach 1:
The patent removes the light guide plate from the backlight unit structure and redistributes its light guiding function to other existing components (reflecting plate, diffusion sheet, prism sheet), thereby eliminating the heavy component while maintaining optical performance
Solution Approach 2:
The patent combines the light guiding function with existing components (reflecting plate, diffusion sheet, prism sheet) that are already part of the backlight unit, eliminating the need for a separate light guide plate and reducing overall manufacturing complexity and cost
3Weight of stationary object
If the light guide plate is eliminated, then weight and manufacturing cost are reduced, but brightness uniformity may be affected
Solution Approach 1:
The patent applies different surface properties to different regions of the diffusion sheet (first surface with first surface roughness, second surface with second surface roughness) to control light scattering locally, ensuring uniform brightness distribution across the display panel while maintaining the lightweight design
Solution Approach 2:
The patent optimizes the surface roughness parameters of the diffusion sheet (first surface roughness and second surface roughness) and the mountain angle of the prism sheet (95 to 135 degrees) to achieve equivalent light guiding performance and brightness uniformity without the light guide plate
4Weight of stationary object
If the light guide plate is eliminated, then weight and manufacturing cost are reduced, but exterior quality may be affected
Solution Approach 1:
The patent applies different surface properties to different regions of the diffusion sheet (first surface with first surface roughness, second surface with second surface roughness) to control light scattering locally, ensuring uniform brightness distribution across the display panel while maintaining the lightweight design
Solution Approach 2:
The patent optimizes the surface roughness parameters of the diffusion sheet (first surface roughness and second surface roughness) and the mountain angle of the prism sheet (95 to 135 degrees) to achieve equivalent light guiding performance and brightness uniformity without the light guide plate
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 configuration reduces the weight and manufacturing costs of the backlight unit, enhances brightness uniformity, and improves exterior quality by maintaining equivalent light guiding performance without the light guide plate, addressing issues of brightness asymmetry and dark portions.
Implementation Method 1
a reflecting plate 220 disposed at a rear surface of the light guide plate 23
Implementation Method 2
The diffusion sheet 24 serves to diffuse the light emitted from the light guide plate 23
Implementation Method 3
the prism sheet 25 serves to collect the light emitted from the light guide plate 23 or light diffused at the diffusion sheet 24 in a direction perpendicular to a plane of the display panel 10
Data Source
AI summary
The present disclosure relates to an edge type backlight unit and a display device including the same, and is capable of enabling other optical components including a reflecting plate, a diffusion plate, and a prism sheet to perform a light guiding function by eliminating a light guide plate from a backlight unit. Such an edge type backlight unit according to the present disclosure and the display device including the same are configured by eliminating the light guide plate so that there are effects in which the number of components and manufacturing costs may be reduced, and further an upper end of the display device may be slimmed down to improve an exterior quality.