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

Patent metadata

Field	Value
Publication number	US-10593271-B1
Application number	US-201916243100-A
Country	US
Kind code	B1
Filing date	Jan 9, 2019
Priority date	Jan 9, 2019
Publication date	Mar 17, 2020
Grant date	Mar 17, 2020

Abstract

A micro light-emitting diode driving circuit including a micro light-emitting diode, a first driving transistor, and a second driving transistor is provided. The first driving transistor receives a first driving voltage from a first driving voltage source, and is electrically connected to the micro light-emitting diode and a low voltage source. The second driving transistor receives a second driving voltage from a second driving voltage source, and is electrically connected to the micro light-emitting diode and a low voltage source. One terminal of the first driving transistor and one terminal 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.

First claim

What is claimed is:

1. A micro light-emitting diode driving circuit in a pixel, 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; 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 one terminal of the first driving transistor and one terminal of the second driving transistor are electrically and separately connected to one end of the micro light-emitting diode, wherein respective source terminals of the first driving transistor and the second driving transistor are directly connected to an anode 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 , 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.

3. The micro light-emitting diode driving circuit of claim 2 , 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.

4. The micro light-emitting diode driving circuit of claim 3 , wherein the first scan line and the second scan line are connected to a junction.

5. The micro light-emitting diode driving circuit of claim 4 , wherein the first data line and the second data line are separated from each other.

6. The micro light-emitting diode driving circuit of claim 3 , wherein the first scan line and the second scan line are separated from each other.

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

8. The micro light-emitting diode driving circuit of claim 6 , 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 1 , wherein the first driving voltage source and the second driving voltage source are the same driving voltage source.

10. 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.

11. 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.

12. The micro light-emitting diode driving circuit of claim 11 , 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.

13. 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.

14. 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.

15. A micro light-emitting diode driving circuit in a pixel, 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; 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 one terminal of the first driving transistor and one terminal of the second driving transistor are electrically and separately connected to one end of the micro light-emitting diode, wherein respective drain terminals of the first driving transistor and the second driving transistor are directly connected to a cathode of the micro light-emitting diode, and a lateral length of the micro light-emitting diode is less than or equal to 50 μm.

Assignees

• Mikro Mesa Tech Co Ltd

Inventors

• Chen Li-Yi

Classifications

• G09G2320/066

  for control of contrast · CPC title

• G09G2320/043

  Preventing or counteracting the effects of ageing · CPC title

• G09G2320/0271

  Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping · CPC title

• G09G2300/0852

  being a dynamic memory with more than one capacitor · CPC title

• G09G3/3233 Primary

  with pixel circuitry controlling the current through the light-emitting element · CPC title