Single-side mounted light emitting diode module

DETAILED DESCRIPTION OF THE PRESENT INVENTION The top view of the present invention is shown in FIG.
5.
It is the same as that shown in the prior art FIG.
1.
However, the metal plates 31, 32, 33, 34, which correspond to metal plates 11, 12, 13, 14 in FIG.
1 and wrap around the corner 321, 322, 323, 324 respectively, have different extensions at the bottom from prior art FIG.
2 as shown in FIG.
4.
The ends of the extensions 41, 42, 43, 44 wrapping around the corners 321, 322, 323, 324 respectively all end up and are lined up as contacts 419, 429, 43 and 44 along lower edge of the substrate 30.
The substrate 30 is then set upright on the motherboard 35.
The contacts 419, 429, 43, 44 are soldered to the motherboard by solders 411, 412, 413, 414 respectively.
The solders such as solder 414 makes the module stand up in a vertical direction as shown in FIG.
6.
Because of the upright position of the module, the lights from the LED emit light in a horizontal direction parallel to the substrate 35.
Such an end-soldered module is useful in a back-lighted panel display as shown in FIG.
8.
The end-soldered LED module 300 stands up vertically on the motherboard 35.
The lights from the module 300 are emitted in a horizontal direction, parallel to the motherboard 35.
The horizontal lights then travel to the light conductor 37, and radiate through a translucent diffuser 38 to serve as the back light for the light panel 39.
Compared with the prior art back light system shown in FIG.
7, the present invention does not need a reflecting mirror 16.
While wire-bonding is used to couple the electrodes of the LEDs in FIG.
1 and FIG.
3, it should be pointed out other means of coupling may also be used to make the connections.
Although the diode chip shown in FIG.
3 has either two top electrodes or one top electrode and one bottom electrode, LED diode chips may also have two bottom electrodes as shown in FIG.
9.
Each of the diodes 511, 512, 513 has two bottom electrodes.
Each diode straddles across two metal plate as a flip-chip