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US 11,963,273 B2Granted
LED driving circuit and driving method thereof
AssigneeLx Semicon Co., Ltd.
InventorsSang Suk Kim, Jang Su Kim, Jong Min Lee
Life of this patent
Estimating the term…
Abstract
The present embodiment relates to a communication protocol between an MCU and an LED driving circuit for LED driving. The MCU may define and use an SPI protocol including ID setting, a command, configuration data, etc.
Claims18
A light emitting diode (LED) driving circuit comprising:
- a plurality of current channels electrically connected to LEDs and for delivering driving currents of the LEDs;
- a dimming control circuit configured to individually control the driving currents of the plurality of current channels;
- a first switch circuit configured to adjust a size of a driving current of a LED based on a duty ratio of a pulse width modulation (PWM) signal;
- and
- a second switch circuit configured to receive a pulse amplitude modulation (PAM) signal and to adjust the size of the driving current of the LED, wherein
- the dimming control circuit is configured to receive an LED driving control signal from an external circuit and determine control timing of the driving currents of the plurality of current channels.
3 more elements
A display device comprising:
- a plurality of light emitting diodes (LEDs) disposed in a panel;
- a switch circuit configured to adjust a current supplied to the LEDs;
- an LED driving circuit configured to receive a pulse width modulation (PWM) signal to adjust turn-on and turn-off periods of the switch circuit and a pulse amplitude modulation (PAM) signal to adjust current intensity of the switch circuit and to change a driving current of the LEDs;
- and
- a microcontroller unit (MCU) configured to transmit an LED driving control signal to the LED driving circuit so that the LED driving circuit performs hybrid driving in which PWM driving and PAM driving are mixed,
- wherein the LED driving control signal independently sets supply timing of the driving current transmitted to the LEDs for each current channel.
3 more elements
A display device comprising:
- light emitting diodes (LEDs) connected to a plurality of current channels and configured to transmit light to a panel;
- and
- a microcontroller unit (MCU) configured to transmit a serial clock signal and a local dimming signal to an LED driving circuit in order to control operation of the LED driving circuit controlling driving currents of the LEDs, wherein
- the MCU is configured to control differently control timings of driving currents of the LEDs of the plurality of current channels, and
- the MCU is configured to generate an LED driving control signal, which controls a duty ratio of a pulse width modulation (PWM) signal to adjust a size of the driving currents of the LEDs and controls a pulse amplitude modulation (PAM) signal to adjust the size of the driving currents of the LEDs, and deliver the LED driving control signal to the LED driving circuit.
2 more elements
Dependencies are inferred from the claim text.