Light-Guide Plate Convex Structure for Thin Display Luminance
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Solution Overview
Problem
Thinning of optical members in display apparatuses compromises rigidity and optical characteristics, particularly in larger display panels, where mutual surface adhesion leads to detachment and reduced luminance.
Innovation Solution
Incorporating convex parts with varying diffusivities and densities on the light-guide plate surface to interpose between the light-guide plate and optical sheet, enhancing adhesion and maintaining optical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If optical members are thinned to reduce apparatus thickness, then the overall apparatus becomes thinner, but rigidity of the apparatus deteriorates
Solution Approach 1:
The invention segments the adhesion interface between optical members by providing both convex parts (for optical function) and flat parts (for adhesion function) on the light-guide plate surface. This segmentation allows simultaneous achievement of thinning, rigidity maintenance through increased adhesion area, and optical characteristic preservation.
2Strength
If mutual surface adhesion is performed between optical members to maintain rigidity, then rigidity is improved, but optical characteristics such as luminance deteriorate
Solution Approach 1:
The invention applies local quality by creating different surface regions with different functions: convex parts maintain optical characteristics by preventing direct contact (preserving air layer for light reflection), while flat parts provide adhesion function. This local differentiation resolves the contradiction between rigidity and luminance.
3Illumination intensity
If optical members are adhered in a dotted or linear partial region to maintain optical characteristics, then luminance is maintained, but adhesion area is reduced leading to detachment
Solution Approach 1:
The invention transitions from conventional two-dimensional planar adhesion to a three-dimensional structured surface with convex and flat parts. This dimensional change allows the adhesion area to be expanded onto the flat parts while the convex parts maintain optical characteristics, simultaneously improving both luminance and adhesion 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
The convex parts secure adhesion areas, reduce stress, and maintain luminance distribution, preventing detachment and optical loss in the display apparatus.
Implementation Method 1
The disposition of the second raised part in at least a portion of the second region on a periphery of the first region inside the second surface of the light-guide plate allows for increase in adhesion area as well as reduction in the stress applied to the first convex parts
Implementation Method 2
the first convex parts are disposed in the first region inside the second surface, thereby allowing light propagating inside the light-guide plate to be reflected and to be outputted from the first surface
Implementation Method 3
the reflective sheet is adhered to side of the second surface of the light-guide plate, with the plurality of convex parts being interposed therebetween
Data Source
AI summary
An illuminating unit includes: a plurality of light sources; a light-guide plate including an end surface disposed to face the plurality of light sources, a first surface that outputs light which is based on incident light from the end surface, and a second surface that faces the first surface and includes a plurality of convex parts; and an optical sheet adhered to side of the second surface of the light-guide plate, with the plurality of convex parts being interposed therebetween. The plurality of convex parts include a plurality of first convex parts disposed in a first region inside the second surface, and one or plurality of second convex parts disposed in at least a portion of a second region on a periphery of the first region inside the second surface.