LED Backlight Lens Covers Substrate Holes
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Solution Overview
Problem
Liquid crystal display devices with light emitting diode backlights experience light unevenness and reduced luminance due to low light reflectance on the substrate surface, especially around the light emitting diodes where the reflection sheet does not fully cover the substrate.
Innovation Solution
Incorporating lenses larger than the holes in the reflection sheet to cover the exposed substrate surface around light emitting diodes, which diffuses light and enhances luminance by reflecting it, and optionally having slits for easier attachment and using a diffusion plate to reduce brightness unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the reflection sheet has holes larger than the light emitting diodes to allow mounting, then the light emitting diodes can be mounted on the substrate, but the substrate surface is exposed and light reflectance is lowered causing light unevenness and reduced luminance
Solution Approach 1:
A resin layer is introduced as an intermediary substance to fill the holes in the reflection sheet and cover the exposed substrate surface. This resin layer acts as a mediator that maintains the reflective properties of the substrate while allowing the light emitting diodes to be properly mounted through the holes.
Solution Approach 2:
The invention applies different properties to different regions: the reflection sheet maintains its reflective property in most areas, while the holes are selectively filled with resin to maintain reflectance where the substrate would otherwise be exposed. This local application of reflective quality prevents light unevenness only where needed.
2Ease of manufacture
If the holes in the reflection sheet are made larger to facilitate light emitting diode mounting, then mounting becomes easier, but the area of low light reflectance increases reducing overall backlight luminance
Solution Approach 1:
The resin layer serves as an intermediary that restores the reflective function to the hole regions. By filling the holes with resin having appropriate optical properties, the effective reflective area is maintained even when holes are made large enough for easy mounting.
3Device complexity
If the substrate surface is exposed around the light emitting diodes, then the mounting structure is simplified, but light is absorbed instead of reflected causing light unevenness
Solution Approach 1:
The resin layer acts as an intermediary coating that covers the exposed substrate surface, preventing light absorption and maintaining uniform reflectance across the entire surface including the previously exposed regions around the light emitting diodes.
Solution Approach 2:
The resin is applied locally to the exposed substrate regions, providing the necessary reflective property only where the substrate would otherwise absorb light, while leaving other areas unchanged.
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 significantly enhances the luminance of the backlight by ensuring that light is reflected by the lenses rather than being absorbed by the substrate, resulting in improved uniformity and overall brightness.
Implementation Method 1
lenses provided on the each of the light emitting diodes, for diffusing light from the light emitting diodes
Implementation Method 2
light is reflected by a surface of the each of the lenses because the each of the lenses covers the exposed surface of the light emitting diode substrate
Data Source
AI summary
A liquid crystal display device includes a liquid crystal display panel and a backlight. The backlight includes: a light emitting diode substrate on which light emitting diodes are mounted; a reflection sheet that is provided on the light emitting diode substrate and has holes formed therein, each of the light emitting diodes being provided inside each of the holes; and lenses provided on the light emitting diodes, for diffusing light from the light emitting diodes. Each of the lenses is larger than the each of the holes, and entirely covers the each of the holes and also covers a part of the reflection sheet including an entire periphery of the each of the holes.