U-Shaped Lamp Holder Resin Coating for LCD Light Guide Protection
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Solution Overview
Problem
In liquid crystal display apparatuses using LEDs as light sources, the thinning of light guide plates due to environmental conditions like heat or moisture leads to deformation, making it difficult to replace the light source unit without causing light leakage or display quality deterioration, as the U-shaped metal parts can scrape the light guide plate and result in extraneous substances entering the display area.
Innovation Solution
A planar light source device with a U-shaped lamp holder that does not overlap with the light guide plate's emitting surface, combined with a flexible shielding sheet attached to the lamp holder and a convex rib in the frame to ensure secure adhesion and prevent light leakage, allowing for easy replacement and maintaining display quality even with deformed light guide plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a U-shaped metal lamp holder is used to hold the LED light source, then the light source can be securely positioned and replaced, but the metal lamp holder scrapes the light guide plate during replacement, causing deformation and generating extraneous substances that enter the display area
Solution Approach 1:
A resin coating layer is applied to the lamp holder that contacts the light guide plate, serving as an intermediary material between the metal lamp holder and the light guide plate. This resin layer prevents direct metal-to-glass contact during lamp replacement, eliminating scraping and deformation while maintaining secure positioning of the light source.
2Object-affected harmful factors
If the lamp holder is designed to closely contact the light guide plate, then light leakage is prevented, but the light guide plate cannot be deformed due to environmental conditions like heat or moisture
Solution Approach 1:
The resin coating layer on the lamp holder acts as a flexible element that can accommodate thermal expansion and moisture-induced deformation of the light guide plate. This flexible coating maintains continuous contact to prevent light leakage while allowing the rigid light guide plate to deform without breaking the seal.
3Length of moving object
If the light guide plate is thinned to adapt to LED thickness, then the overall device thickness is reduced, but the light guide plate becomes more susceptible to deformation from environmental conditions
Solution Approach 1:
The resin coating layer is applied beforehand to the lamp holder, creating a protective cushion between the rigid components and the deformable light guide plate. This pre-applied cushioning material compensates for future deformations caused by environmental conditions, maintaining proper contact and preventing light leakage even when the thinned light guide plate deforms.
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 light leakage and maintains display quality by avoiding direct contact between the lamp holder and light guide plate, allowing for efficient replacement and improved workability even with warped light guide plates, thus reducing luminance loss and display irregularities.
Implementation Method 1
the lamp holder 4 is formed by coating a resin material having a light reflection function on an outer surface of the U-shaped metal member
Data Source
AI summary
A planar light source device includes at least a light guide plate and a lamp unit disposed replaceably at a side surface of the plate. The lamp unit includes: a lamp holder having a shape where a surface facing the side surface of the light guide plate is opened; an LED mounted on a flexible cable, the cable fixed on an inner surface of the lamp holder; and a shielding sheet fixed on an outer surface of the lamp holder. An upper portion of the lamp holder located close to a light emitting surface of the light guide plate does not overlap its light emitting surface when viewed from a normal direction of the light emitting surface. One end of the shielding sheet is fixed to the upper portion of the lamp holder, the other end being closely attached to the light emitting surface of the light guide plate.