Light Guide Plate Sandblasting for Backlight Luminance
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Solution Overview
Problem
In liquid crystal display devices, the tight adhesion between the reflection sheet and the light guide plate at areas without grooves leads to light escape, as the reflection sheet directly contacts the light guide plate, causing light to be transmitted through instead of being reflected, resulting in reduced luminance.
Innovation Solution
The introduction of rough surfaces or projections on the light guide plate, formed by sandblasting, prevents tight adhesion between the reflection sheet and the light guide plate, creating an air layer that prevents light from being transmitted through the reflection sheet, ensuring it is reflected back to the multilayer film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the reflection sheet is disposed directly on the bottom surface of the light guide plate to improve luminance, then light reflection efficiency is improved, but light escape occurs at areas without grooves due to tight adhesion
Solution Approach 1:
The invention applies different surface treatments to different regions of the light guide plate bottom surface. Grooves are formed in specific areas to allow tight adhesion and high reflection efficiency, while sandblasting is applied in other areas to create rough surfaces that prevent tight adhesion and light escape. This local differentiation resolves the contradiction between maximizing luminance and preventing light escape.
Solution Approach 2:
The rough surface created by sandblasting acts as an intermediary layer between the reflection sheet and the light guide plate in areas without grooves. This rough surface prevents direct contact and tight adhesion, thereby preventing light escape while still allowing the reflection sheet to be disposed on the bottom surface for luminance improvement.
2Stability of the object's composition
If grooves are disposed in the bottom surface of the light guide plate to scatter light, then light distribution is improved, but light non-uniformity occurs in areas where grooves are not disposed
Solution Approach 1:
The invention creates local quality differences through sandblasting in areas without grooves. The rough surfaces formed by sandblasting scatter light in these regions, complementing the groove scattering in other areas. This ensures uniform light distribution across the entire bottom surface while maintaining the light scattering function of grooves in specific areas.
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 enhances luminance by preventing light escape and maintaining even light distribution, addressing the issue of light non-uniformity and adhesion-related light loss.
Implementation Method 1
creating an air layer that prevents light from being transmitted through the reflection sheet
Implementation Method 2
formed by sandblasting
Implementation Method 3
a laminate film type of reflection sheet is formed by laminating plural films with different refractive indexes
Implementation Method 4
ensuring it is reflected back to the multilayer film
Data Source
AI summary
To prevent, in a backlight where light emitting diodes are arranged on a side surface of a light guide plate, light leakage from a reflection sheet and reduce non-uniformity of emission light from the backlight. In a liquid crystal display device that includes a backlight that irradiates a liquid crystal panel with light, LEDs are disposed as light emitting elements on a light guide plate that is disposed in the backlight, a reflection sheet that comprises a multilayer film is disposed on a bottom surface of the light guide plate, projections are disposed by sandblasting on the bottom surface of the light guide plate in the vicinity of the LEDs, and tight adhesion between the reflection sheet and the light guide plate is prevented. In the vicinity of the LEDs, in order to counter light non-uniformity, reflecting grooves are not disposed and it is a mirror surface, but tight adhesion can be prevented by disposing the projections.