Circuit Board Protective Member for LED Thermal Expansion
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Solution Overview
Problem
The challenge is to prevent damage to light emitting diodes (LEDs) in backlight units of liquid crystal displays (LCDs) from thermal expansion of the light guide plate while maintaining the slimness and miniaturization of the backlight unit.
Innovation Solution
A circuit board design that includes a support substrate with a protective member connecting part, which stabilizes the protective member between light emitting device mounting parts, preventing rotation and damage from thermal expansion of the light guide plate, and features a protective member that protrudes beyond the light emitting device to secure it in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the LED and the light guide plate are disposed to be close to each other to achieve slimness and miniaturization, then the backlight unit size is reduced, but the LED is damaged upon thermal expansion of the light guide plate
Solution Approach 1:
A protective member is introduced as an intermediary element positioned between the light guide plate and the LED. This protective member absorbs or accommodates the thermal expansion of the light guide plate, preventing direct contact and damage to the LED while allowing the LED and light guide plate to remain in close proximity for slimness.
Solution Approach 2:
The protective member is pre-positioned between the light guide plate and LED to provide cushioning before thermal expansion occurs. This beforehand cushioning prevents damage by absorbing expansion forces, allowing the backlight unit to maintain compact dimensions while protecting the LED from thermal stress.
2Reliability
If a protective member is added to prevent LED damage from thermal expansion, then LED protection is improved, but the device complexity increases
Solution Approach 1:
The protective member is implemented as a thin film or flexible structure that can accommodate thermal expansion while maintaining a compact profile. This thin-film approach provides the necessary protection function without significantly increasing the overall device complexity or volume.
Solution Approach 2:
The protective member serves as a simple intermediary element that mediates between the thermally expanding light guide plate and the sensitive LED. By positioning this single protective component, the solution achieves LED protection with minimal additional structural 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 LED damage from thermal expansion of the light guide plate, ensuring the backlight unit's slimness and miniaturization are maintained, and securely positions the protective member to prevent rotation and ensure stability.
Implementation Method 1
The LED is a light emitting device which generates light using a light emitting phenomenon generated at the time of applying a voltage to a semiconductor
Implementation Method 2
it is problematic in that the LED is damaged upon thermal expansion of the light guide plate
Data Source
Figure 1A~1B
Figure 1C~2A
Figure 2B~2C
AI summary
Provided are a circuit board for irradiating light to a light guide plate and a flat panel display having a structure for efficiently fixing the circuit board and the light guide plate, the circuit board, including: a support substrate (10) comprising a first area and a second area, the second area being bent from the first area; a plurality of light emitting device mounting parts (30) disposed in the first area; and a protective member connecting part of an outer side of the plurality of light emitting device mounting parts (30).