LED display packaging with substrate removal and method of fabrication
First Claim
1. A method of fabricating a light emitting diode display package comprising the steps of:
- providing a display chip, having a gallium arsenide (GaAs) substrate with a major surface;
forming an array of light emitting diodes on the major surface of the gallium arsenide (GaAs) substrate;
providing a driver chip formed on a silicon substrate;
flip chip mounting the display chip to the driver chip;
selectively removing the gallium arsenide (GaAs) substrate from the display chip thereby exposing an etch stop layer; and
electrically interfacing the display chip to the driver chip utilizing a plurality of fan out interconnects positioned about a perimeter of the driver chip and the display chip.
18 Assignments
0 Petitions
Accused Products
Abstract
A light emitting diode display package and method of fabricating a light emitting diode (LED) display package including a LED array display chip, fabricated of an array of LEDs, formed on a substrate, having connection pads positioned about the perimeter of the LED array display chip, a separate silicon driver chip having connection pads routed to an uppermost surface, positioned to cooperatively engage those of the display chip when properly registered and interconnected using wafer level processing technology. The display chip being flip chip mounted to the driver chip and having a layer of interchip bonding dielectric positioned between the space defined by the display chip and the driver chip. The LED display and driver chip package subsequently having selectively removed the substrate onto which the LED array was initially formed, thereby exposing the connection pads of the display chip and a remaining indium-gallium-aluminum-phosphide (InGaAlP) epilayer. The light emitted from the LED display chip, being emitted through the remaining indium-gallium-aluminum-phosphide (InGaAlP) epilayer of the display chip.
121 Citations
23 Claims
-
1. A method of fabricating a light emitting diode display package comprising the steps of:
-
providing a display chip, having a gallium arsenide (GaAs) substrate with a major surface; forming an array of light emitting diodes on the major surface of the gallium arsenide (GaAs) substrate; providing a driver chip formed on a silicon substrate; flip chip mounting the display chip to the driver chip; selectively removing the gallium arsenide (GaAs) substrate from the display chip thereby exposing an etch stop layer; and electrically interfacing the display chip to the driver chip utilizing a plurality of fan out interconnects positioned about a perimeter of the driver chip and the display chip. - View Dependent Claims (2, 3)
-
-
4. A method of fabricating a light emitting diode display package comprising the steps of:
-
providing a light emitting diode chip having a gallium arsenide (GaAs) substrate with a major surface; forming an array of light emitting diodes on the major surface of the gallium arsenide (GaAs) substrate, thereby defining a display area; forming a plurality of bond pads about a perimeter of the display chip, in electrical cooperation with the array of light emitting diodes; providing a driver chip formed on a silicon substrate, having a plurality of drive components formed therein; forming a plurality of bond pads about a perimeter of the driver chip, in electrical cooperation with the drive components, cooperatively positioned to engage the bond pads of the array of light emitting diodes; flip chip mounting the display chip to the driver chip; selectively removing the gallium arsenide (GaAs) substrate from the light emitting diode chip, thereby exposing an etch stop layer; and interfacing the plurality of bond pads, in electrical cooperation with the array of light emitting diodes, to the plurality of bond pads, in electrical cooperation with the drive components of the driver chip, thereby electrically connecting the light emitting diode chip to the driver chip. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A method of fabricating a light emitting diode display package comprising the steps of:
-
providing a display chip having a gallium arsenide (GaAs) substrate with a major surface; forming an array of indium gallium aluminum phosphide (InGaAlP) light emitting diodes on the major surface of the gallium arsenide (GaAs) substrate, thereby defining a display area; forming a plurality of bond pads, in electrical cooperation with the array of light emitting diodes, positioned about a perimeter of the display area; forming a plurality of row and column connections, routed to the plurality of bond pads in electrical cooperation with the array of light emitting diodes; providing a driver chip formed on a silicon substrate, having a plurality of drive components formed therein; forming a plurality of bond pads, in electrical cooperation with the drive components, routed to an uppermost surface of the driver device, cooperatively positioned to engage the bond pads of the array of light emitting diodes; flip chip mounting the display chip to the driver chip in flip chip orientation; depositing a layer of non-conductive material within an area defined between the display chip and the driver chip; selectively removing the gallium arsenide (GaAs) substrate from the display chip thereby exposing an indium-gallium-aluminum-phosphide epilayer of the display chip; and interconnecting the plurality of bond pads, in electrical cooperation with the array of light emitting diodes of the display chip, to the plurality of bond pads, in electrical cooperation with the drive components of the driver chip, using wafer level processing, thereby electrically connecting the display chip to the driver chip. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
-
-
21. A method of fabricating a light emitting diode display package comprising the steps of:
-
providing a substrate of gallium arsenide (GaAs) with a major surface; forming an array of indium gallium aluminum phosphide (InGaAlP) light emitting diodes on the major surface of the substrate, thereby forming a light emitting diode device having a defined display area; forming a plurality of bond pads in electrical cooperation with the array of light emitting diodes, positioned about a perimeter of the display area; forming a plurality of electrically isolated row and column connections, routed to the plurality of bond pads in electrical cooperation with the array of light emitting diodes; providing a separate driver device formed on a silicon substrate, having a plurality of drive components formed therein; forming a plurality of bond pads in electrical cooperation with the drive components, routed to an uppermost surface of the driver device; depositing a layer of interchip bonding dielectric adhesive within an area defined between the display chip and the driver chip; selectively removing the gallium arsenide (GaAs) substrate from the light emitting diode device, thereby leaving an exposed epilayer; and interconnecting the plurality of bond pads in electrical cooperation with the light emitting diodes, in flip chip attachment to the plurality of bond pads in electrical cooperation with the drive components of the driver device, thereby electrically connecting the light emitting diode device to the driver device utilizing wafer level processing. - View Dependent Claims (22, 23)
-
Specification