The present invention relates to a light bar structure, and especially to an LED light bar structure.
Light Emitting Diodes (LEDs) have advantages of long life, high light efficiency, and energy saving, so the LEDs are gradually utilized as a backlight source of an LCD. Referring to
In general, the way of welding the LEDs 25 onto the circuit board 40 is by stamping the pins 27 of the LEDs 25 on the contact pads 42 having soldering tin thereon to slightly fix the LEDs 25 on the circuit board 40 and then to put into a hot oven to melt the soldering tin between the pins 27 and the contact pads 42. After cooling, the pins 27 and the contact pads 42 are connected together, thereby completing the welding process.
However, the LEDs 25 may shift in the soldering tin melting process such that the pins 27 fail to align with the contact pads 42. Moreover, the material of the LEDs 25 may experience a chemical change after being processed by the high temperature, so that optical properties such as chromaticity or brightness of the LEDs 25 are changed and fail to achieve the desired optical effects. In addition, if some LEDs 25 are broken, the broken LEDs 25 can be replaced by removing the LEDs 25 through a special solvent with a welding torch. However, the original optical properties of the LEDs 25 are easy to be changed by the high temperature during the contact of the welding torch and further to affect the optical properties of the backlight module.
Accordingly, an objective of the present invention is to provide an LED light bar structure to solve the above-mentioned problem by using an engaging structure to replace welding.
To achieve the foregoing objectives, according to an aspect of the present invention, the LED light bar structure provided by the present invention includes at least one LED, a circuit board, and a plurality of wires. Each LED has two or an even number of pins. The circuit board has at least one receiving space and at least two recesses, in which the LED is disposed in the receiving space, and each of the pins is engaged in a corresponding one of the recesses. The wires are disposed in the circuit board, and the wires are electrically coupled to the pins of the LED, respectively.
In one preferred embodiment, each LED has a light-emitting surface, and the light-emitting surface is exposed outside the corresponding receiving space. The light bar structure according to the preferred embodiment further includes a reflector, which the reflector are disposed on the circuit board. The reflector defines at least one opening corresponding to the at least one light-emitting surface for exposing the at least one light-emitting surface of the LED. More specifically, the reflector is utilized to fix the LED into the receiving space.
In another preferred embodiment, the light bar structure further includes at least one elastic bump, and the elastic bump is disposed in the recess to clamp each of the pins engaged in the recess.
In another preferred embodiment, the recess is inclined with respect to a direction of the pin to be inserted into the receiving space, thereby the pin being bent after being inserted into the recess.
In another preferred embodiment, one of the recesses is an arch-shaped ditch for each LED. The LED is rotatably disposed in the receiving space, and one of the pins of the LED is engaged in one end of the arch-shaped ditch.
In accordance with the design of the receiving space and the recess in the circuit board, the LED can be easily fixed on the circuit board with an advantages of easy replacement. Therefore, the present invention overcomes drawbacks of the LEDs shifting when being welded by means of the conventional welding and the material change of the LEDs at high temperature, and further overcomes that the LEDs have to be replaced by de-soldering the LEDs.
It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
The present invention will now be described in detail with reference to a preferred embodiment , thereof as illustrated in the accompanying drawings . In different drawings the same reference numbers will be used throughout the drawings to refer to the same or like parts. Referring to
Each LED 25 has two pins 27. However, the pins of each LED 25 also can be four or an even number of pins, and the present invention does not limited the number of the pins. As shown in
It is worth mentioning that each of the LED 25 has a light-emitting surface 28, and the light-emitting surface 28 is exposed outside the corresponding receiving space 46 to emit light. In the first preferred embodiment, the light bar structure 110 further includes a reflector 80. The reflector 80 are disposed on the circuit board 40, and the reflector 80 defines at least one opening 82 corresponding to the at least one light-emitting surface 28 for exposing the light-emitting surface 28. The reflector 80 is utilized to fix the LED into the receiving space 46. More specifically, the reflector 80 can resist against one end of the pin 27 for fixing the pin 27 in the recess 43.
In addition to the effect of fixing the LED 25, the reflector 80 has an effect of reflecting the light from the LED 25 for increasing light utilization efficiency. Moreover, the light bar structure 110 is held against an incident surface 92 of a light guide plate 90 in a top-view LED backlight module, so the reflector 80 can fill the gap between the LED 25 and the light guide plate 90 to strengthen the assemble therebetween.
Referring to
A second preferred embodiment of the present invention will be explained in the following. Referring to
A third preferred embodiment of the present invention will be explained in the following. Referring to
A fourth preferred embodiment of the present invention will be explained in the following. Referring to
The following will explain assembly processes of the light bar structure 140 in the fourth preferred embodiment. A first step of the assembly processes includes insert one of the pins 27 into one end of the arch-shaped ditch when disposing the LED 25 into the receiving space 46 of the circuit board 40; meanwhile, a direction of the LED 25 is perpendicular to the direction 41 of the circuit board 40. Then a second step thereof includes rotate the LED 25 counterclockwise to make the pin 27 to engage in another end of the arch-shaped ditch (as
In summary, in accordance with the design of the receiving space 46 and the recess 43 in the circuit board 40, the LED 25 can be easily fixed on the circuit board 40 with an advantages of easy replacement. Therefore, the present invention overcomes the drawbacks of the shift of the LEDs 25 in using the conventional welding and the material change of the LEDs 25 at high temperature, and further overcomes that the LEDs 25 have to be replaced by de-soldering the LEDs 25.
While the preferred embodiments of the present invention have been illustrated and described in detail, various modifications and alterations can be made by persons skilled in this art. The embodiment of the present invention is therefore described in an illustrative but not restrictive sense.
Number | Date | Country | Kind |
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100215320 | Aug 2011 | TW | national |