Manufacturing method of light-emitting diode
View Patent ↗A manufacturing method of an LED comprises attaching an LED epitaxial wafer (LED wafer) to an expanding tape, dicing the LED wafer on the expanding tape longitudinally and laterally to a certain element size to divide into a plurality of LED elements, expanding the expanding tape to a certain size to form an enlarged expanding tape, placing respective pairs of element electrodes of the plurality of LED elements that are attached to the enlarged expanding tape on respective pairs of electrodes on a printed-circuit board assembly collectively to perform a bonding, and removing the enlarged expanding tape from the plurality of the LED elements.
1. A manufacturing method of light-emitting diode, comprising:
an attaching-wafer-to-tape step; attaching a first surface of a light-emitting diode epitaxial wafer to an expanding tape, the first surface being opposite to a second surface of the wafer, and the second surface being provided with a plurality of element electrodes,
a dicing-wafer-step; dicing the wafer longitudinally and laterally to form a plurality of light-emitting diode elements each of a certain size with a pair of the element electrodes, in a state that each of the light-emitting diode elements is attached to the expanding tape,
an expanding-tape step; expanding the expanding tape in a state that each of the diced light-emitting diode elements is attached to the expanding tape, thereby forming a certain space between one another of the diced light-emitting diode elements,
a bonding-electrodes step; laying the expanded expanding tape with the plurality of light-emitting diode elements attached over a plurality of pairs of electrodes that are disposed on a printed-circuit board assembly, to electrically dispose each pair of the element electrodes of the plurality of light-emitting diode elements on each pair of the plurality of pairs of electrodes disposed on the printed-circuit board assembly, such that each pair of the element electrodes of the plurality of light-emitting diode elements faces and is bonded to each pair of electrodes disposed on the printed-circuit board assembly; and
a removing-tape step; removing the expanding tape from the light-emitting diode elements each bonded to the corresponding pair of the electrodes on the printed-circuit board.
2. The manufacturing method of light-emitting diode according to claim 1 ,
wherein the bonding at the bonding-electrodes step is a provisional bonding performed with a bonding strength that allows the subsequent removing-tape step in a state that the each pair of the light-emitting diode elements are kept bonded to the each corresponding pair of the electrodes on the printed-circuit board assembly,
and further comprising:
a main bonding step; bonding firmly the each pair of the element electrodes of the plurality of light-emitting diode elements to the each corresponding pair of the electrodes on the printed-circuit board assembly, subsequent to the removing-tape step.
3. The manufacturing method of light-emitting diode according to claim 1 ,
wherein at the bonding-electrodes step, the each pair of the element electrodes of the light-emitting diode elements and the each corresponding pair of the electrodes on the printed-circuit board assembly are collectively bonded at one time.
4. The manufacturing method of light-emitting diode according to claim 1 , further comprising:
a forming-light-transmitting-resin step; forming a light-transmitting resin portion that collectively covers the plurality of light-emitting diode elements on the printed-circuit board assembly, subsequent to the removing-tape step, and
a full-cut dicing step; full-cut dicing the light-transmitting resin portion and the printed-circuit board assembly longitudinally and laterally to divide into a plurality of individual light-emitting diodes.
5. The manufacturing method of light-emitting diode according to claim 1 ,
wherein, at the electrodes-bonding step, an anode electrode and a cathode electrode of the each pair of the element electrodes are bonded to an anode electrode and a cathode electrode of the each pair of the electrodes on the printed-circuit board assembly by a pair of bumps.
6. The manufacturing method of light-emitting diode according to claim 1 , further comprising:
a forming-light-transmitting-resin step; disposing the light-transmitting sheet that includes a fluorescent material on upper surfaces of the light-emitting diode elements, and then heating the light-transmitting sheet that includes the fluorescent material to melt to cover the upper surfaces and side surfaces of the light-emitting diode elements to form a fluorescent light-transmitting layer on the upper surfaces and side surfaces of the light-emitting diode elements, and
a full-cut dicing step; full-cut dicing the light-transmitting layer and the printed-circuit board assembly longitudinally and laterally to divide into a plurality of light-emitting diodes.