Backlight Module Detachable Light Source Unit Slide Mechanism
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Solution Overview
Problem
The utilization efficiency of LEDs in LCD devices is compromised due to the risk of damaging the light emitting surface and optical incident plane of the light guide plate during the exchange of the detachable light source unit, leading to potential display defects and reduced light emission.
Innovation Solution
A backlight module design that allows the light source unit to slide along the edge of the light guide plate, featuring a cover member with a coupling mechanism that adjusts the distance between the light emitting surface of the LEDs and the optical incident plane, ensuring minimal contact during insertion or ejection to prevent damage and maintain optimal light utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the light emitting surface of the LED is placed as close as possible to the optical incident plane of the light guide plate to maximize light utilization efficiency, then the optical characteristic is improved, but the risk of damage to the light emitting surface and optical incident plane during light source exchange increases
Solution Approach 1:
The light source unit is segmented from the light guide plate assembly, allowing the LED array to be mounted on a separate flexible substrate that can be independently exchanged. This segmentation enables the light source to be replaced without direct contact with the light guide plate, resolving the contradiction between close positioning for efficiency and separation for protection during exchange operations
Solution Approach 2:
A flexible substrate acts as an intermediary between the LED light sources and the light guide plate. This intermediary layer allows the light emitting surface to be positioned close to the optical incident plane for efficient light coupling while preventing direct contact and potential damage during light source exchange operations
2Ease of repair
If the light source unit is made detachable to enable easy replacement, then the ease of repair is improved, but the structural complexity increases due to the need for coupling mechanisms and spacing
Solution Approach 1:
The light source unit is designed with dynamic positioning capability, allowing it to be easily inserted and removed along the edge of the light guide plate. The flexible substrate enables the light source unit to adapt its position during exchange operations, simplifying the coupling mechanism and improving ease of repair while maintaining minimal contact during replacement
Solution Approach 2:
A flexible substrate is used to mount the LED array, allowing the light source unit to be easily detached and reattached. This flexible mounting approach simplifies the overall coupling mechanism compared to rigid structures, enabling easy light source replacement while reducing structural complexity through the use of flexible 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 design prevents damage to the light emitting surface and optical incident plane, maintaining high light utilization efficiency and extending the lifespan of the LCD device by minimizing contact during light source exchanges.
Implementation Method 1
a light guide plate (LGP) which guides a light flux from the light source across a liquid crystal display (LCD) panel
Data Source
AI summary
A backlight module with a detachable light source unit includes a light guide plate and a light source unit housed in a module case. The light source unit can slide along a lengthwise direction of one end face of the light guide plate. The light source unit is equipped with a U-shaped cover member for holding a plurality of point light sources such as LEDs along a lengthwise direction. The backlight module further includes a coupling member to change a positional relationship between the light guide plate and the light source unit such that a distance between an emitting surface of the LED and an incident plane of the light guide plate during a process of exchanging the light source unit is larger than that between the emitting surface and the incident plane at a time of home position of the light source unit in the module case.