LED display utilizing freestanding epitaxial LEDs

• US 20100060553A1
• Filed: 08/20/2009
• Published: 03/11/2010
• Est. Priority Date: 08/21/2008
• Status: Abandoned Application

• Current Assignee: Goldeneye, Inc.
• Original Assignee: Goldeneye, Inc.
• Inventors: Livesay, William R., Beeson, Karl W., Zimmerman, Scott M.
• Application Number:
  US12/583,527
• Publication Number:
  US 20100060553A1
• Time in Patent Office: Days
• US Class Current: 345/60
• CPC Class Codes: H01L 24/95 at chip-level, i.e. with connecting carried out on a plurality of singulated devices, i.e. on diced chips
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 27/156 two-dimensional arrays
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/01322 Eutectic Alloys, i.e. obtained by a liquid transforming into two solid phases
• CPC Class Codes: H01L 2924/09701 Low temperature co-fired ceramic [LTCC]
• CPC Class Codes: H01L 2924/12036 PN diode
• CPC Class Codes: H01L 2924/12041 LED
• CPC Class Codes: H01L 2924/12044 OLED
• CPC Class Codes: H01L 2924/14 Integrated circuits
• CPC Class Codes: H01L 33/08 with a plurality of light emitting regions, e.g. laterally discontinuous light emitting layer or photoluminescent region integrated within the semiconductor body H01L27/15 takes precedence
• CPC Class Codes: H01L 33/20 with a particular shape, e.g. curved or truncated substrate
• CPC Class Codes: H01L 33/385 the electrode extending at least partially onto a side surface of the semiconductor body

Abstract

High resolution light emitting diode (LED) displays can be formed from freestanding small epitaxial LED chips or small LED arrays. The addressing elements for the LED display can be active matrix backplane. The LED display may use isotropic and directional luminescent elements. The LED displays can be flat screen, fixed image, projection or low resolution or high resolution direct view. A macro freestanding epitaxial LED chip with multiple addressable pixels is described which forms a complete microdisplay.

Claims

1. A display comprising

multiple epichip LEDS.

2. The display in claim 1 further comprising

addressing means to epichip LEDs to form either a monochrome or color display.

3. The display in claim 1 further comprising

optical elements formed in the epichip LEDs.

4. The display in claim 1 wherein the epichip LEDs are initially freestanding (not attached to a non-native substrate prior to being mounted to form the display) and are at least 10 micrometers thick.

5. The display in claim 1 wherein the epichips are fabricated by forming LEDs on thin 10 to 100 micrometer nitride foils.

6. A display comprising

multiple epichip LEDs or a single macro epichip LED;

and

means for interconnecting and addressing the individual emissive elements to form a one or two dimensional display.

7. The display in claim 6 wherein the epichip LEDs are transparent and emit on opposite sides to form a transparent display which emits from both sides.

8. An addressable LED display or backlight comprising

an LED;

a waveguide; and

light extraction elements.

9. The LED display or backlight in claim 8 wherein the light extraction elements consist of wavelength conversion chips arrayed and embedded in the waveguide and surround the addressable LED.

10. A display comprising

epichip LEDS;

an addressable backplane or xy grid; and

wherein the epichip LEDs are arrayed on the backplane and form a two dimensional display.

11. The display in claim 10 where the epichips are dispersed onto the addressable backplane via a fluid or gas or printed via inkjet.