Backlight Chassis Hole Sealing for LED Workability
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Solution Overview
Problem
The existing backlight units for liquid crystal display devices face issues with thermal expansion differences between the power supply circuit board and the LED board, leading to stress and cracking in soldered connections, which affects electric connection reliability, and also suffer from poor workability during assembly and disassembly, as well as dust ingress due to clearance requirements.
Innovation Solution
A lighting device with a chassis that includes a hole for a relaying and connecting part to be inserted from outside, providing electrical connection to the light source while a covering member seals the clearance, enhancing workability and preventing dust entry, using a flexible electric wire and connector with a ring-shaped covering member for improved attachment and detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lead frame is used to electrically connect the LED board and power supply circuit board, then electrical connection reliability is maintained, but workability in attaching and detaching operations deteriorates
Solution Approach 1:
The invention divides the connection system into separate components: a flexible electric wire for electrical connection and a dedicated connector for mechanical attachment. This segmentation allows the wire to provide reliable electrical connection while the connector enables easy attaching and detaching operations without compromising either function.
Solution Approach 2:
The invention introduces a connector as an intermediary component between the electric wire and the LED board/power supply circuit board. This mediator enables easy attachment and detachment operations while the electric wire maintains reliable electrical connection, resolving the contradiction between connection reliability and operational ease.
2Ease of operation
If a flexible electric wire and connectors are used instead of a lead frame, then workability in attaching and detaching operations is improved, but dust entry through the hole portion increases
Solution Approach 1:
The invention uses a flexible electric wire that can be routed through the hole portion and a connector that seals around the wire. This flexible configuration allows easy attachment and detachment while the connector's sealing structure prevents dust from entering through the hole, resolving the contradiction between operational ease and dust protection.
3Reliability
If a lead frame is used to connect the LED board and power supply circuit board, then electrical connection is maintained, but thermal expansion differences cause stress and cracking
Solution Approach 1:
The invention changes the physical parameters of the connection system by replacing the rigid lead frame with a flexible electric wire. This parameter change allows the wire to accommodate thermal expansion differences between the LED board and power supply circuit board, preventing stress and cracking while maintaining reliable electrical connection.
Solution Approach 2:
The invention introduces dynamic flexibility into the connection system through the use of a flexible electric wire. This dynamic property allows the wire to adapt to thermal expansion and contraction movements, preventing stress concentration and cracking that occur with rigid lead frame connections, thereby maintaining connection reliability under thermal stress.
Data Source
AI summary
It is an object of present invention to improve wiring workability in a lighting device and to prevent the entry of dust or the like into the device. A backlight unit according to the present technology includes a chassis having hole portions, LEDs housed in the chassis as light sources, relaying and connecting part electrically connected to the LEDs from outside the chassis through the hole portion and relaying electric power supply to the LEDs, and a covering member covering a clearance between the hole portions and the relaying and connecting parts inserted therethrough.