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US 11,900,859 B2Granted
Active matrix hybrid microLED display
AssigneeLumileds LLC
InventorsWilhelmus Johannes Robertus Van Lier, Marcus Hendrikus Adrianus van Steen, Nicola Bettina Pfeffer, Rob Jacques Paul Engelen, Erkan Diken, Arjen Gerben Van Der Sijde
Life of this patent
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Abstract
A driver system controls a plurality of light emitting diodes (LEDs). The driver system includes a first driver to provide an LED current to each of the plurality of LEDs. The first driver includes a current mirror for the LED current provided to the plurality of LEDs. The driver system also includes a second driver to modulate the LED current provided to the plurality of LEDs.
Claims18
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 more elements
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.
3 more elements
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.
4 more elements
Dependencies are inferred from the claim text.