Backlight Module Reflection Surface Glue Density for Light Leakage
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Solution Overview
Problem
Backlight modules in LCDs suffer from light leakage and uneven brightness distribution due to the high directivity of light emitted by LEDs and the presence of bent structures, which affect image display quality.
Innovation Solution
The implementation of a backlight module design where glues are alternately disposed between the reflection sheet and the reflection surface of a light guide board in a from-sparse-to-dense manner, using low absorbance glues to enhance brightness in darker areas and high absorbance glues to reduce brightness in brighter areas, thereby compensating for uneven light distribution and preventing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If reflection sheets are stuck on light exit surfaces to prevent light loss, then light reflection efficiency is improved, but light leakage occurs due to bent structures in the reflection surface
Solution Approach 1:
The patent applies different glue densities at different locations on the reflection surface. Areas with bent structures (ear portions) use sparser glue placement to prevent light leakage, while flat areas use denser glue placement to maximize light reflection. This local differentiation resolves the contradiction between preventing light loss and avoiding light leakage at bent structures.
Solution Approach 2:
The reflection surface is divided into multiple regions based on their structural characteristics (flat areas vs. bent areas with ear portions). Each region receives a customized glue disposal pattern, segmenting the uniform reflection surface into functionally distinct zones that address their specific optical requirements.
2Power
If light emitting diode devices are disposed at the side of the light entrance surface, then light source efficiency is improved, but uneven brightness distribution occurs on the light exit surface
Solution Approach 1:
The patent implements location-specific glue disposal patterns on the reflection surface to compensate for the uneven light distribution caused by side-mounted LEDs. Areas receiving excessive light have denser glue placement to reduce brightness, while darker areas have sparser glue placement to enhance brightness, achieving overall uniformity.
Solution Approach 2:
The patent changes the physical parameters of the glue disposal (density, spacing, coverage area) across different regions of the reflection surface. By varying these parameters spatially, the system compensates for the non-uniform light emission from side-mounted LEDs and achieves uniform brightness distribution.
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 design effectively prevents light leakage and ensures uniform brightness distribution across the light exit surface, enhancing the image display quality of LCDs by optimizing the placement and absorbance properties of the glues.
Implementation Method 1
other light exit surfaces have reflection sheets stuck thereon for light reflection, so as to prevent light loss and increase efficiency of the backlight module in use of light
Implementation Method 2
using low absorbance glues to enhance brightness in darker areas and high absorbance glues to reduce brightness in brighter areas
Data Source
AI summary
A backlight module includes a light guide board, at least one light emitting unit, a plurality of first glues, and a first reflection sheet. The light guide board has a light entrance surface, a light exit surface, and at least one reflection surface. The reflection surface is connected to the light entrance surface and the light exit surface respectively. The light emitting unit is disposed at the light entrance surface of the light guide board. The plurality of first glues is alternatively disposed on the reflection surface in a from-sparse-to-dense manner. The first reflection sheet is disposed on the plurality of first glues such that the first reflection sheet can be fixed onto the reflection surface.