Backlight Unit Shock-Absorbing Member Design
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Solution Overview
Problem
Liquid Crystal Displays (LCDs) are prone to damage from movement of the light guide plate, which can cause collision with LED packages and lead to deteriorated color uniformity and potential damage due to shock or heat transfer from the bottom chassis.
Innovation Solution
A backlight unit design that incorporates a shock-absorbing member, such as insulating tape made of rubber or silicone, which contacts the reflective sheet and light guide plate to prevent movement and absorb shocks, thereby protecting the components and maintaining color uniformity. The shock-absorbing member is strategically positioned between the bottom chassis and the reflective sheet or light guide plate, using protrusions and brackets to secure the light guide plate and reflective sheet in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the light guide plate is rigidly fixed to the bottom chassis, then structural stability is improved, but shock and heat damage from movement cannot be absorbed
Solution Approach 1:
The patent applies beforehand cushioning by introducing shock-absorbing members (first and second shock-absorbing members) between the bottom chassis and the light guide plate/reflective sheet. These members are positioned in advance to absorb shocks and thermal stress before they can cause damage to the LED packages or deteriorate color uniformity, thus resolving the contradiction between structural stability and shock protection.
Solution Approach 2:
The patent uses shock-absorbing members as intermediary elements between the bottom chassis and the optical components (light guide plate and reflective sheet). These intermediaries prevent direct rigid contact, allowing the system to maintain structural stability while absorbing harmful shocks and heat, thus protecting against damage without compromising stability.
2Object-affected harmful factors
If the light guide plate is allowed to move freely, then shock absorption is improved, but color uniformity deteriorates due to movement
Solution Approach 1:
The shock-absorbing members are pre-positioned between the bottom chassis and the optical components to cushion against shocks before they cause damage. This allows controlled movement that absorbs shock while preventing the excessive movement that would deteriorate color uniformity, thus resolving the contradiction between shock absorption and manufacturing precision.
Solution Approach 2:
The patent changes the mechanical parameter of the connection between bottom chassis and light guide plate by introducing compliant shock-absorbing members. This transforms the rigid connection into a compliant one that allows controlled movement for shock absorption while maintaining positioning accuracy sufficient for color uniformity, thus resolving the contradiction.
3Stability of the object's composition
If protrusions are added to secure the light guide plate, then positional stability is improved, but device complexity increases
Solution Approach 1:
The patent segments the shock absorption function from the positioning function by using separate shock-absorbing members and protrusions. The protrusions provide positional stability while the shock-absorbing members handle shock absorption, dividing the system into functional segments that work together to resolve the contradiction between positional stability and device complexity.
Solution Approach 2:
The shock-absorbing members serve multiple functions: they provide shock absorption, thermal insulation, and positioning assistance work. This multi-functionality reduces the need for additional separate components, thus maintaining positional stability without significantly increasing device complexity.
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 prevents damage to the light guide plate and reflective sheet from shocks and heat, ensuring stable operation and maintaining the color uniformity of the backlight unit by preventing unwanted movement and absorbing thermal stress.
Implementation Method 1
a shock-absorbing member, such as insulating tape made of rubber or silicone, which contacts the reflective sheet and light guide plate to prevent movement and absorb shocks
Implementation Method 2
absorbing thermal stress
Implementation Method 3
insulating tape made of rubber or silicone
Data Source
Figure 1~2
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AI summary
A backlight unit is disclosed. The backlight unit includes a light emitting device to emit light, an optical member to guide the light emitted from the light emitting device, a bottom chassis disposed on a rear surface of the optical member so as to support the optical member, a supporting member coming into partial contact with the bottom chassis so as to support a module including the light emitting device and a shock-absorbing member disposed between the rear surface of the optical member and the bottom chassis.