Backlight Device Reflector Pushing Substrates for Heat Dissipation
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Solution Overview
Problem
In backlight devices for liquid crystal displays, gaps between light source substrates and the bottom chassis due to thermal expansion differences or chassis irregularities lead to inefficient heat dissipation, reducing LED luminous efficiency and causing variations in brightness and color.
Innovation Solution
A backlight device design where light source substrates are pushed against the bottom chassis using a reflector attached with double-faced adhesive tape and magnets, ensuring intimate contact and efficient heat radiation, comprising flexible metal core substrates and a wiring substrate for thermal conductivity and electrical connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If light source substrates are attached to the bottom chassis using conventional methods, then the structure is simple, but gaps form between the substrates and chassis due to thermal expansion differences or chassis irregularities, reducing heat dissipation efficiency
Solution Approach 1:
The bottom chassis is divided into a light source substrate attachment area with protrusions and a reflector attachment area with recesses. This segmentation allows different attachment mechanisms to be applied to different areas, ensuring intimate contact for heat dissipation while maintaining structural integrity.
Solution Approach 2:
A reflector is introduced as an intermediary component between the light source substrates and the bottom chassis. The reflector is attached to the chassis in the recessed area, which then pushes the substrates against the protrusions, ensuring intimate contact without requiring direct attachment mechanisms between substrates and chassis.
2Reliability
If gaps form between light source substrates and bottom chassis, then the attachment structure remains simple, but LED temperature increases reducing luminous efficiency and causing brightness/color variations
Solution Approach 1:
The reflector is pre-attached to the bottom chassis in the recessed area before the light source substrates are positioned. This preliminary action creates a pushing mechanism that automatically ensures intimate contact between the substrates and the chassis protrusions, preventing gap formation before operational issues can arise.
Solution Approach 2:
The reflector serves as a mediator that translates the rigid chassis structure into a gentle pushing force on the substrates. This intermediary component ensures consistent contact pressure across the substrate-chassis interface, maintaining reliable thermal coupling without requiring complex adjustment mechanisms.
3Manufacturing precision
If light source substrates are made flexible to conform to chassis irregularities, then intimate contact is improved, but structural strength and positioning precision may be compromised
Solution Approach 1:
The bottom chassis is designed with local protrusions in the light source substrate attachment area rather than requiring the entire substrate to be flexible. This localized approach allows rigid substrates to maintain their strength while achieving precise contact at specific points through the protrusion-substrate interface.
Solution Approach 2:
The reflector acts as a mediator that distributes contact forces across multiple points between the substrates and chassis protrusions. This intermediary component allows rigid substrates to achieve intimate contact without requiring flexibility, as the reflector translates chassis irregularities into manageable contact points.
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
Prevents decreases in LED luminous efficiency and variations in brightness and color by ensuring consistent contact and effective heat dissipation, improving image quality and reliability.
Implementation Method 1
a reflector reflecting the illumination light irradiated from the light emitting devices
Implementation Method 2
a diffuser facing the one surface side of the reflector through a predetermined facing interval from the reflector and internally diffusing the illumination light incident from the reflector
Implementation Method 3
a plurality of light source substrates on which a plurality of light emitting devices that irradiate illumination light are mounted
Implementation Method 4
the reflector is directly attached to the one surface of the bottom chassis
Implementation Method 5
light source substrates are pushed against the bottom chassis
Data Source
AI summary
A backlight device that illuminates a transmissive liquid crystal panel is disclosed. The device includes: a plurality of light source substrates on which a plurality of light emitting devices irradiating illumination light are mounted; a bottom chassis having one surface to which the plurality of light source substrates are attached; a reflector having openings corresponding to the light emitting devices and through which the light emitting devices are exposed to one surface side, and reflecting the illumination light irradiated from the light emitting devices; a diffuser facing the one surface side of the reflector through a predetermined facing interval and internally diffusing the illumination light incident from the reflector; and an optical function sheet laminate combined with the diffuser on one surface side thereof, containing a stack of a plurality of optical function sheets and guiding the illumination light to the transmissive liquid crystal panel.