Backlight Unit Recessed Light Absorbing Member
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Solution Overview
Problem
Thin backlight units for liquid crystal displays face issues with light leakage due to reduced thickness of light guide plates, leading to non-uniform luminance and hot spots.
Innovation Solution
A backlight unit design incorporating a light absorbing member within the bottom chassis, featuring recessed areas with different thicknesses and materials, positioned near the light incident and tapered regions to minimize light leakage and enhance luminance uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the thickness of the light guide plate is reduced to slim the backlight unit, then the overall thickness of the backlight unit is reduced, but light leakage occurs leading to non-uniform luminance and hot spots
Solution Approach 1:
A light absorbing member is introduced as an intermediary element between the light guide plate and the bottom chassis. This member absorbs stray light that would otherwise cause leakage and non-uniform luminance, enabling the use of thinner light guide plates while maintaining luminance uniformity. The light absorbing member acts as a mediator that resolves the conflict between thinning the backlight unit and preventing light leakage.
Solution Approach 2:
The bottom chassis is designed with recesses at specific locations where light leakage is most problematic. The light absorbing member is selectively placed in these recesses, creating local quality improvements at critical areas rather than requiring uniform thickening of the entire light guide plate. This allows targeted suppression of light leakage while maintaining overall thinness.
2Length of moving object
If the thickness of the light guide plate is reduced, then the backlight unit becomes thinner, but light leakage increases causing hot spots and non-uniform luminance distribution
Solution Approach 1:
The light absorbing member converts the harmful effect of stray light (which causes leakage and hot spots) into a beneficial outcome by absorbing this stray light. Instead of trying to prevent stray light generation, the invention utilizes the light absorbing member to capture and eliminate the harmful stray light, transforming the problem of light leakage into a controlled light absorption process that improves luminance uniformity.
Solution Approach 2:
The light absorbing member serves as an intermediary that intercepts stray light before it can cause harmful leakage effects. By placing this intermediary element in the path of stray light within the bottom chassis, the system prevents the conversion of stray light into harmful leakage, enabling thinner light guide plates without the associated harmful effects.
3Reliability
If a light absorbing member is added to prevent light leakage, then luminance uniformity is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The bottom chassis is segmented with recesses that are specifically designed to accommodate the light absorbing member. This segmentation allows the light absorbing member to be integrated into the existing structure without requiring complete redesign of the entire backlight unit. The recesses create discrete locations for placing the light absorbing member, simplifying the integration process and reducing overall device complexity.
Solution Approach 2:
The light absorbing member is nested within the recesses of the bottom chassis, utilizing the existing structural space rather than adding external components. This nesting approach allows the light absorbing member to be incorporated into the existing backlight unit structure without significantly increasing overall complexity or manufacturing difficulty, as it fits within already-defined spatial boundaries.
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 effectively reduces light leakage and prevents hot spots, ensuring improved uniformity and quality of luminance in liquid crystal display devices.
Implementation Method 1
a light absorbing member disposed in the bottom unit of the bottom chassis... The light absorbing member is disposed in the first and second recesses
Data Source
AI summary
Provided are a backlight and a liquid crystal display device including the same. The backlight unit includes a light source assembly which emits light; a light guide plate which receives at a light incident surface thereof light from the light source assembly; and a bottom chassis having a bottom unit on which the light guide plate is disposed. The bottom unit of the bottom chassis has a first bottom portion which is arranged in the vicinity of the light incident surface and has a first recess, a second bottom portion which is bent diagonally to the cross sectional surface and has a second recess, and a third bottom portion which is bent at the second bottom portion in the direction parallel to the first bottom portion and disposed higher than the first bottom portion. A light absorbing member is disposed in the first and second recesses.