Active matrix hybrid microLED display

1. A driver system, comprising:

a mirror transistor coupled to a current source;

at least two driving transistors coupled in parallel and configured to mirror current in the mirror transistor;

a first light emitting diode (LED) and a first modulator coupled in series and configured to receive a first current from one of the at least two driving transistors, a first end of the first LED directly coupled to one of the at least two driving transistors, a second end of the first LED directly coupled to a first end of the first modulator, a second end of the first modulator coupled to a low rail; and

a second LED and a second modulator coupled in series and configured to receive a second current from another of the at least two driving transistors, a first end of the second LED directly coupled to the other of the at least two driving transistors, a second end of the second LED directly coupled to a first end of the second modulator, a second end of the second modulator coupled to the low rail, the first LED configured to emit light having a first color, the second LED configured to emit light having the first color.

2. The driver system of claim 1 , wherein the mirror transistor and the at least two driving transistors are thin-film transistors.

3. The driver system of claim 1 , further comprising a first controller to set a reference current to be mirrored to the mirror transistor.

4. The driver system of claim 1 , wherein the first modulator is configured to modulate the first current via pulse-width modulation (PWM) and the second modulator is configured to modulate the second current via PWM.

5. The driver system of claim 1 , wherein the first LED and the second LED are micro LEDs.

6. The driver system of claim 1 , wherein the current source is a discrete circuit component.

7. The driver system of claim 1 , wherein the current source is disposed in an analog integrated circuit (IC) and the first modulator and the second modulator are disposed in a digital driver IC to form a hybrid driving arrangement.

8. The driver system of claim 1 , wherein the current source and the first modulator and the second modulator are disposed in a mixed signal integrated circuit (IC).

9. The driver system of claim 1 , wherein the current source is programmable.

10. The driver system of claim 1 , wherein the at least two driving transistors are disposed in a transistor backplane.

11. The driver system of claim 1 , wherein a first end of the mirror transistor is coupled to the current source and a second end of the mirror transistor is coupled to a high rail.

12. The driver system of claim 1 , wherein a first end of the mirror transistor is coupled to the current source, a second end of the mirror transistor is coupled to a first end of another mirror transistor, and a second end of the other mirror transistor is coupled to a high rail.

13. A method implemented by a driver system, the method comprising:

receiving, with a mirror transistor, current from a current source;

receiving, with at least two driving transistors coupled in parallel, current from the mirror transistor;

receiving, with a first light emitting diode (LED) and a first modulator eoupled in series, a first current from one of the at least two driving transistors, a first end of the first LED directly coupled to one of the at least two driving transistors, a second end of the first LED directly coupled to a first end of the first modulator, a second end of the first modulator coupled to a low rail; and

receiving, with a second LED and a second modulator coupled in series,

a second current from another of the at least two driving transistors, a first end of the second LED directly coupled to the other of the at least two driving transistors, a second end of the second LED directly coupled to a first end of the second modulator, a second end of the second modulator coupled to the low rail, the first LED configured to emit light having a first color, the second LED configured to emit light having the first color.

14. The method of claim 13 , wherein the mirror transistor and at least the two driving transistors are thin-film transistors.

15. The method of claim 13 , wherein the driver system includes a first controller to set a reference current to be mirrored to the mirror transistor.

16. The method of claim 13 , wherein the first modulator is configured to modulate the first current via pulse-width modulation (PWM) and the second modulator is configured to modulate the second current via PWM.

17. The method of claim 13 , wherein the first LED and the second LED are micro LEDs.

18. A light-emitting diode (LED) matrix, comprising:

a plurality of LEDs arranged in rows and columns, the plurality of LEDs including a first LED configured to emit light having a first color,

a second LED configured to emit light having the first color, and a third LED configured to emit light having a second color different from the first color; a mirror transistor coupled to a current source;

two driving transistors coupled in parallel and configured to receive current from the mirror transistor;

a first modulator coupled in series with the first LED and configured to receive a first current from one of the two driving transistors, a first end of the first LED directly coupled to one of the two driving transistors, a second end of the first LED directly coupled to a first end of the first modulator, a second end of the first modulator coupled to a low rail; and

a second modulator coupled in series with the second LED and configured to receive a second current from the other of the two driving transistors, a first end of the second LED directly coupled to the other of the two driving transistors, a second end of the second LED directly coupled to a first end of the second modulator, a second end of the second modulator coupled to the low rail.