Lighting stick with LBD wafer

Abstract

A light emitting stick having LED chips (9) is disclosed. The light emitting stick comprises a strip shaped frame (7), a circuit board (8) and a plurality of LED chips (9). The upper part of the frame has a groove (701), and the lower part of the frame has a plurilty of vertical holes (702). The top of each of the vertical holes (702) and the bottom of the groove (701) are feedthrough. A negative pole plate (11) is placed on the upper surface of the circuit board (8), and has a plurality of throughholes (111). The position of the throughholes (111) corresponds to the position of the vertical holes (702). The circuit board (8) has a pluralityof positive pole pads (12). The positive pole pads (12) are exposed from the throughholes (111) on the negative pole plate (11), respectively. The bottom surface of the frame (7) bonds to the negative pole plate (11). The LED chips (9) are embedded into the vertical holes (702) of the frame (7), respectively. The positive terminal wires (902) of the LED chips (9) are connected to the positive terminal wires (902) of the positive pole pad (12) one by one, and the negative terminal wires (901)of the LED chips (9) are connected to the negative pole plate (11) of the circuit board (8) one by one. The inner walls of the groove (701) form reflective walls.

Description

technical field [0001] The invention belongs to the field of optoelectronic technology, and relates to a luminous rod, in particular to a luminous rod composed of light-emitting diodes. The luminous rod can be used as a liquid crystal backlight source or a projection light source, and can also be used for illumination. Background technique [0002] Commonly used backlights for computers and TV LCD screens include cold cathode fluorescent lamps, electroluminescence, and light sticks. [0003] The structure of the existing luminous rod is: a plurality of light-emitting diodes are arranged at intervals on a strip-shaped circuit board, each light-emitting diode is composed of a housing and a light-emitting diode chip packaged in the housing, and the positive and negative sides of the light-emitting diode chip The terminal welding wires are connected with the pins at both ends of the shell, and the pins are soldered on the circuit board with tin, and there is an aluminum substrat...

AI Technical Summary

Problems solved by technology

[0004] 1. The heat dissipation area is small: the heat is dissipated by a piece of aluminum substrate under the circuit board, and the heat of the light-emitting diode is mainly generated by its negative terminal. The heat must first pass through the circuit board to be transmitted to the aluminum substrate, and the circuit board itself will block the flow of heat. Conduction, poor cooling effect

[0005] 2. Poor light concentrating effect: each light emitting diode can be regarded as a point light source, and the light emitted by it includes side light and scattered light, which cannot be converged, which reduces the brightness of the light stick, and must be compensated by increasing the number of light emitting diodes Lack of brightness

[0006] 3. Short length: relying only on the support of the sheet-shaped aluminum substrate, the structural strength is poor, and it is easy to bend and deform. The light-emitting stick cannot be made very long, and it is difficult to industrialize large-scale production

[0007] 4. The positive and negative terminal welding wires of the light-emitting diode chip are connected to the pins at both ends of the housing. The positive and negative terminal welding wires are very thin gold wires with low thermal impedance, and the pins play the role of supporting the housing. It is a relatively thick aluminum strip, the pins are welded on the circuit board with tin, the solder joints are very large, the thermal impedance of the junction between the pins and the solder joints is high, and it is easy to generate heat, which will have an adverse effect on the light stick

[0008] Exactly because of the above reasons, the existing luminous sticks are not generally adopted, and the market share is less than 10%.

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