Micro light-emitting diode driving circuit and display using the same

Patent metadata

Field	Value
Publication number	US-10390397-B1
Application number	US-201916243101-A
Country	US
Kind code	B1
Filing date	Jan 9, 2019
Priority date	Jan 9, 2019
Publication date	Aug 20, 2019
Grant date	Aug 20, 2019

Abstract

A micro light-emitting diode driving circuit is provided. First and second driving transistors respectively receive a first driving voltage and a second driving voltage, and are electrically connected to the micro light-emitting diode and a low voltage source. A length of an edge of a channel of the first driving transistor in contact with the source terminal is shorter than that in contact with the drain terminal. A length of an edge of a channel of the second driving transistor in contact with the source terminal is greater than or equal to that in contact with the drain terminal. One of the source and drain terminals of the first driving transistor and one of the source and drain terminals of the second driving transistor are electrically and separately connected to one end of the micro light-emitting diode.

First claim

What is claimed is:

1. A micro light-emitting diode driving circuit, comprising:
a micro light-emitting diode;
a first driving transistor configured to receive a first driving voltage from a first driving voltage source, and being electrically connected to the micro light-emitting diode and a low voltage source, wherein a length of an edge of a channel of the first driving transistor in contact with a source terminal is shorter than a length of an edge of the channel of the first driving transistor in contact with a drain terminal; and
a second driving transistor configured to receive a second driving voltage from a second driving voltage source, and being electrically connected to the micro light-emitting diode and the low voltage source, wherein a length of an edge of a channel of the second driving transistor in contact with a source terminal is greater than or equal to a length of an edge of the channel of the second driving transistor in contact with a drain terminal;
wherein one of the source and drain terminals of the first driving transistor and one of the source and drain terminals of the second driving transistor are electrically and separately connected to one end of the micro light-emitting diode, and a lateral length of the micro light-emitting diode is less than or equal to 50 μm.

2. The micro light-emitting diode driving circuit of claim 1 , wherein the source terminal of the first driving transistor is surrounded by the drain terminal of the first driving transistor.

3. The micro light-emitting diode driving circuit of claim 1 , wherein the drain terminal of the second driving transistor is surrounded by the source terminal of the second driving transistor.

4. The micro light-emitting diode driving circuit of claim 1 , wherein the edge of the channel of the second driving transistor in contact with the source terminal and the edge of the channel of the second driving transistor in contact with the drain terminal are stripes and parallel to one another.

5. The micro light-emitting diode driving circuit of claim 1 , further comprising:
a first storage capacitor having two ends, wherein one of the two ends of the first storage capacitor is connected to a gate terminal of the first driving transistor, and another of the two ends is connected to a source terminal of the first driving transistor or a first reference voltage; and
a second storage capacitor having two ends, wherein one of the two ends of the second storage capacitor is connected to a gate terminal of the second driving transistor, and another of the two ends is connected to a source terminal of the second driving transistor or a second reference voltage.

6. The micro light-emitting diode driving circuit of claim 5 , further comprising:
a first switching transistor having a gate terminal connected to a first scan line, a drain terminal connected to a first data line, and a source terminal connected to said one of the two ends of the first storage capacitor and the gate terminal of the first driving transistor; and
a second switching transistor having a gate terminal connected to a second scan line, a drain terminal connected to a second data line, and a source terminal connected to said one of the two ends of the second storage capacitor and the gate terminal of the second driving transistor.

7. The micro light-emitting diode driving circuit of claim 6 , wherein the first scan line and the second scan line are connected to a junction.

8. The micro light-emitting diode driving circuit of claim 7 , wherein the first data line and the second data line are separated from each other.

9. The micro light-emitting diode driving circuit of claim 6 , wherein the first scan line and the second scan line are separated from each other.

10. The micro light-emitting diode driving circuit of claim 9 , wherein the first data line and the second data line are connected to a junction.

11. The micro light-emitting diode driving circuit of claim 9 , wherein the first data line and the second data line are separated from each other.

12. The micro light-emitting diode driving circuit of claim 1 , wherein the first driving voltage source and the second driving voltage source are the same driving voltage source.

13. The micro light-emitting diode driving circuit of claim 1 , wherein the first driving voltage source and the second driving voltage source are separated from each other.

14. The micro light-emitting diode driving circuit of claim 1 , wherein a ratio of a channel width to a channel length of the second driving transistor is greater than a ratio of a channel width to a channel length of the first driving transistor.

15. The micro light-emitting diode driving circuit of claim 14 , wherein said ratio of the channel width to the channel length of the second driving transistor is at least twice greater than said ratio of the channel width to the channel length of the first driving transistor.

16. The micro light-emitting diode driving circuit of claim 1 , wherein a ratio of a channel width to a channel length of the second driving transistor is the same as a ratio of a channel width to a channel length of the first driving transistor.

17. A micro light-emitting diode display, comprising:
a substrate; and
a plurality of the micro light-emitting diode driving circuits of claim 1 present on the substrate.

Assignees

• Mikro Mesa Tech Co Ltd
• Mikro Mesa Technoogy Co Ltd

Inventors

• Chen Li-Yi

Classifications

• H05B45/44

  with an active control inside an LED matrix · CPC title

• G09G2320/043

  Preventing or counteracting the effects of ageing · CPC title

• G09G3/2011

  by amplitude modulation · CPC title

• G09G2300/0895

  having more than one selection line for a two-terminal active matrix LCD, e.g. Lechner and D2R circuits · CPC title

• G09G2360/144

  the light being ambient light · CPC title