Barrier Walls for Display Light Guide Plate Protection
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Solution Overview
Problem
Non-self-emissive display devices, such as liquid crystal displays, require a separate backlight unit, leading to inefficiencies in light use and potential damage to light sources due to the thickness and design of the light guide plate.
Innovation Solution
The implementation of a display device with a light guide plate, printed circuit board, and barrier walls that include reflective and support members to control light radiation angles, increase light incidence, and maintain a safe distance between light sources and the light guide plate, utilizing a COB type LED and elastic members to prevent damage and bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the light guide plate is made thinner to reduce device thickness, then the device thickness is reduced, but the light sources may come too close to the light guide plate causing damage
Solution Approach 1:
The patent introduces barrier walls as intermediary structures between the light sources and the light guide plate. These barrier walls extend from the printed circuit board upward to block the light guide plate from contacting the light sources, thereby preventing damage while allowing the light guide plate to maintain a thin profile.
Solution Approach 2:
The space between the light sources and light guide plate is segmented into different regions using barrier walls. The first barrier wall creates a first area with a first distance and a second area with a second distance, allowing optimized spacing in different zones to prevent damage while maintaining thin overall thickness.
2Reliability
If the distance between light sources and light guide plate is increased to prevent damage, then light source protection is improved, but light-use efficiency decreases
Solution Approach 1:
The patent applies different barrier wall configurations in different areas: the first barrier wall creates a first area with a larger first distance for protection, while the second area has a smaller second distance optimized for light efficiency. This local differentiation allows simultaneous achievement of protection and efficiency.
Solution Approach 2:
The barrier walls are designed with bent portions that dynamically adjust the spacing between light sources and light guide plate. The bending allows the structure to adapt to thermal expansion and contraction, maintaining optimal distances for both protection and efficiency under different operating conditions.
3Use of energy by moving object
If the light guide plate is positioned closer to light sources to improve light incidence, then light-use efficiency is improved, but the risk of damage to light sources increases
Solution Approach 1:
The barrier walls are positioned in advance to prevent the harmful contact between the light guide plate and light sources. By establishing these protective structures before assembly, the design preemptively counteracts the potential damage that would occur if the light guide plate were positioned too close for optimal light efficiency.
4Manufacturing precision
If the barrier walls are made rigid to maintain precise spacing, then spacing precision is improved, but thermal expansion causes bending and damage
Solution Approach 1:
The patent changes the physical parameters of the barrier walls by introducing bent portions with specific curvature radii. These bent portions allow the barrier walls to flex and accommodate thermal expansion, maintaining spacing precision while adapting to temperature changes without causing damage.
Solution Approach 2:
The barrier walls are formed as composite structures integrating both reflective members (for light efficiency) and support members (for mechanical stability). This composite design allows the structure to simultaneously maintain precise spacing and resist thermal deformation through the combined properties of different materials.
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 light-use efficiency by reducing light radiation angles and maintaining a safe distance between light sources and the light guide plate, preventing damage and ensuring the light guide plate does not bend due to heat expansion.
Implementation Method 1
The first barrier wall includes a first reflective member disposed in the first area and reflecting the light emitted from the light sources to the light guide plate
Implementation Method 2
The first barrier wall includes a first auxiliary portion disposed on the printed circuit board and a first elastic portion disposed on the first auxiliary portion and having elasticity
Data Source
AI summary
A display device includes a display panel receiving light and displaying an image, a light guide plate guiding the light to the display panel, a printed circuit board disposed adjacent to one side of the light guide plate and including first and second areas alternately defined therein, light sources mounted on the printed circuit board to correspond to the first area and to supply the light to the light guide plate, a first barrier wall disposed on the printed circuit board and extending in a direction in which the light sources are arranged, and a second barrier wall facing the first barrier wall such that the light sources are disposed between the first and second barrier walls, the second barrier wall disposed on the printed circuit board, and extending in the direction.