Backlight Reflection Member Bowing Prevention in LCD
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Solution Overview
Problem
The existing liquid crystal display devices experience brightness reduction due to gaps formed between the reflection member and the light guide plate, caused by the bowing of the reflection member into the recess in the lower frame, and heat generation issues from light-emitting diodes, leading to degradation of the light-emitting diode and peripheral devices.
Innovation Solution
A liquid crystal display device with a recess in the lower frame that includes a holding member between the reflection member and the lower frame to prevent bowing, and using a heat-conductive material like an aluminum plate for the holding member and light-emitting diode substrate to minimize heat effects, ensuring proper light reflection and heat management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the reflection member is placed close to the light-emitting diode to propagate light without loss, then light utilization efficiency is improved, but the reflection member bows downward into the recess over time due to its own weight, forming gaps that reduce brightness
Solution Approach 1:
A support member is introduced as an intermediary between the reflection member and the lower frame to provide mechanical support. This support member prevents the reflection member from bowing downward into the recess while maintaining its close proximity to the light guide plate, thus preserving both light utilization efficiency and brightness stability over time.
2Use of energy by moving object
If the light-emitting diode is used as the light source, then energy efficiency is improved, but heat generation degrades the light-emitting diode and peripheral devices
Solution Approach 1:
The support member is designed with heat-conductive properties to convert the harmful heat generated by the light-emitting diode into a beneficial thermal management function. The support member conducts heat away from the light-emitting diode and reflection member area, dissipating it through the lower frame structure, thus maintaining energy efficiency while preventing heat-related degradation.
3Device complexity
If a recess is formed in the lower frame to accommodate the light-emitting diode substrate, then device integration is improved, but the reflection member bows into the recess forming gaps that reduce backlight brightness
Solution Approach 1:
The support member acts as a mediator that enables the recess structure to maintain its space-saving integration while preventing the reflection member from bowing into the recess. By providing mechanical support, the support member eliminates gap formation and maintains optimal light reflection, thus preserving backlight brightness while achieving compact device integration.
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 prevents brightness reduction by maintaining the reflection member's position and reduces heat generation, thereby maintaining the backlight's brightness and extending the lifespan of the light-emitting diode and peripheral devices.
Implementation Method 1
a light-emitting diode irradiating the light guide plate with the illumination light from a side portion of the light guide plate
Implementation Method 2
The light about to exit from the back side of the light guide plate is reflected by the reflection member 8 to be returned to the inside of the light guide plate 9
Implementation Method 3
at least one of the holding member and the lower frame is formed of an aluminum plate
Data Source
AI summary
Liquid crystal display device preventing brightness reduction of a backlight even when a recess is formed in a lower frame accommodating the backlight and a light-emitting diode substrate mounted with a light-emitting diode is accommodated in the recess. A backlight includes a reflection member arranged on the back side of a light guide plate, and the light-emitting diode irradiating the light guide plate with illumination light from a side portion of the light guide plate. The recess protruding on the back side is formed in the lower frame for accommodating and arranging the light-emitting diode substrate mounted with the light-emitting diode therein. A part of an end portion of the reflection member protrudes into a space formed by the recess toward the light emitting diode. A holding member is arranged between the reflection member and the lower frame at least to hold the protruding region of the reflection member.