Backlight Module Projections Retain LEDs
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Solution Overview
Problem
Thermal cycling causes the light guide plate in liquid crystal displays to expand and contract, leading to adhesive delamination and increased gaps between LEDs and the light guide plate, resulting in reduced brightness, uniformity, and accelerated component wear, as well as increased power consumption.
Innovation Solution
The integration of projections on the light guide plate that retain LEDs between the projections and the body, maintaining close proximity and structural integrity, and allowing for limited movement to accommodate thermal expansion, thereby preventing gap formation and maintaining consistent illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the light guide plate is rigidly fixed to the printed circuit, then structural stability is improved, but thermal expansion stress causes adhesive delamination and component damage
Solution Approach 1:
The patent introduces a flexible printed circuit board that can dynamically adjust its shape to accommodate thermal expansion and contraction of the light guide plate. The flexible PCB bends and deforms elastically in response to thermal cycles, preventing rigid stress buildup that would cause adhesive delamination, while maintaining electrical connectivity and structural stability throughout operation.
2Stability of the object's composition
If the light guide plate is rigidly fixed to the printed circuit, then structural stability is improved, but thermal expansion causes increased gaps between LEDs and the light guide plate
Solution Approach 1:
The flexible printed circuit board serves as a dynamic compensation mechanism that maintains consistent spacing between LEDs and the light guide plate during thermal cycles. As the light guide plate expands or contracts, the flexible PCB deforms accordingly, absorbing dimensional changes and preventing gap formation that would compromise LED positioning precision and illumination uniformity.
3Stability of the object's composition
If the light guide plate is rigidly fixed to the printed circuit, then structural stability is improved, but component wear accelerates due to thermal cycling stress
Solution Approach 1:
The flexible printed circuit board acts as a shock-absorbing element that dynamically responds to thermal expansion and contraction forces. By allowing controlled deformation rather than rigid constraint, the flexible PCB reduces mechanical stress on solder joints, LEDs, and other components, thereby preventing fatigue-induced failures and extending the operational lifespan of the backlight assembly.
4Stability of the object's composition
If the light guide plate is rigidly fixed to the printed circuit, then structural stability is improved, but power consumption increases due to accelerated component wear
Solution Approach 1:
The flexible printed circuit board prevents premature component failure by accommodating thermal stress, ensuring that LEDs and other components operate within their designed lifespan. By eliminating stress-induced degradation, the system maintains optimal efficiency and avoids the increased power consumption that would result from replacing worn components or operating degraded hardware, thereby reducing overall energy usage throughout the product lifecycle.
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 the structural integrity of the light guide plate and maintains LED proximity, ensuring consistent brightness and uniformity, reducing component wear and power consumption over the display's lifecycle.
Implementation Method 1
An adhesive affixes the printed circuit to the light guide plate
Implementation Method 2
Thermal cycling causes the light guide plate in liquid crystal displays to expand and contract
Data Source
AI summary
Examples are disclosed that relate to backlight modules, displays including a backlight module, and methods for assembling a backlight module. In one example, a backlight module for a display comprises light sources affixed to a printed circuit and a light guide plate. An adhesive affixes the printed circuit to the light guide plate. The light guide plate comprises a body and a plurality of projections extending from the body, with the plurality of projections retaining two or more of the light sources between the projections and the body of the light guide plate.