Backlight Reflection Sheet Through Holes for Luminance Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing liquid crystal display apparatuses with direct type backlight devices experience luminance unevenness due to misalignment of reflection sheet holes with LED light sources, leading to incomplete light reflection and floating issues.
Innovation Solution
A light source device with a diffusion part proximal to the light emission surface, featuring through holes in the reflection sheet where the distance between opposite edges matches the diffusion part size, preventing the reflection sheet from floating and ensuring uniform light reflection by aligning the through holes with the diffusion part positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the through hole is larger than the light emission surface of the LED light source and a part of the edge part of the through hole is disposed between the light emission surface and the LED substrate, then it is possible to prevent the reflection sheet from floating, but regions lacking the reflection sheet are present in the vicinity of the light emission surface and luminance unevenness occurs
Solution Approach 1:
The patent applies local quality by making the through hole size position-dependent: in the first region (vicinity of light emission surface), the through hole has a first size that prevents floating, while in the second region (other areas), the through hole has a second size that ensures complete light reflection. This local differentiation resolves the contradiction between preventing floating and maintaining luminance uniformity.
2Illumination intensity
If the through hole is smaller to match the diffusion part size, then uniform light reflection is achieved, but the reflection sheet may float from the substrate surface
Solution Approach 1:
The patent segments the through hole structure into different regions with different sizes. The first region has larger through holes for floating prevention, while the second region has smaller through holes for uniform light reflection. This segmentation allows each region to optimize for its specific function without compromising the other.
3Ease of manufacture
If the through hole position is shifted in the thickness direction of the LED substrate, then assembly is simplified, but the light cannot be uniformly reflected and luminance unevenness occurs
Solution Approach 1:
The patent implements local quality by creating position-dependent through hole characteristics. Through holes in the first region (aligned with light emission surface) have different properties than those in the second region, allowing the structure to simultaneously achieve easy assembly and uniform light reflection through localized optimization.
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
Prevents luminance unevenness and reflection sheet floating by ensuring proper alignment and coverage, enhancing light uniformity and display quality.
Implementation Method 1
a diffusion part which is provided proximal to a light emission surface of the light emitting element to diffuse the light from the light emitting element
Implementation Method 2
a reflection sheet provided on the one surface of the substrate to reflect light from the light emitting elements
Data Source
AI summary
The present invention provides a light source device which includes light emitting elements mounted on one surface of a substrate, and a reflection sheet provided on the one surface of the substrate to reflect light from the light emitting elements toward a region opposed to the one surface, prevents the reflection sheet from floating from the one surface of the substrate, and reduces regions lacking the reflection sheet in the vicinity of the diffusion parts, as well as, suppress an occurrence of luminance unevenness caused by the floating of the reflection sheet and the lacking of the reflection sheet, and a display apparatus including the light source device. The light source device includes a diffusion part which are provided proximal to a light emission surface of the light emitting element to diffuse the light from the light emitting element, and the reflection sheet is configured so as to have through holes including a part in which a distance between two opposite points in edge thereof is not more than a size of the diffusion part in a view along a vertical direction to the one surface, and the through hole is formed at a position matching with that of the diffusion part in a view along the vertical direction to the one surface.