OLED light source drive control circuit and OLED lamp

Patent metadata

Field	Value
Publication number	US-11259387-B2
Application number	US-201816957383-A
Country	US
Kind code	B2
Filing date	Nov 23, 2018
Priority date	Sep 13, 2018
Publication date	Feb 22, 2022
Grant date	Feb 22, 2022

Abstract

The present disclosure provides an OLED light source drive control circuit and an OLED lamp. The drive control circuit includes a DC/DC constant voltage module, an external transceiver, a first internal transceiver, a microcontroller unit, a linear constant current module, and an OLED panel and a light source. The microcontroller unit communicates with the first internal transceiver, feeds back the detected output voltage to the DC/DC constant voltage module, and controls the DC/DC constant voltage module to operate. The first internal transceiver is connected with the linear constant current module through a differential bus. The linear constant current module includes a plurality of linear constant current driver ICs, each contains a second internal transceiver, and a differential bus interface of the second internal transceiver is respectively connected with a differential bus communication line connecting with a differential bus interface of the first internal transceiver. The present disclosure has a stronger anti-interference ability and effectively improves the circuit conversion efficiency of the entire drive system.

First claim

We claim:

1. An OLED light source drive control circuit, comprising: a DC/DC constant voltage module, an external transceiver, a first internal transceiver, a microcontroller unit, a linear constant current module, and an OLED panel light source; wherein
the DC/DC constant voltage module is connected with a positive pole of a vehicle power line, and outputs power to the external transceiver, the first internal transceiver, the microcontroller unit, and the linear constant current module, respectively;
one end of the external transceiver is connected with a vehicle communication line, and the other end of the external transceiver is connected with the microcontroller unit, the external transceiver receives a control signal transmitted by the vehicle communication line and transmits the control signal to the microcontroller unit for the microcontroller unit to execute a control instruction corresponding to the control signal;
the microcontroller unit communicates with the first internal transceiver, detects an output voltage of the linear constant current module, feeds back the detected output voltage to the DC/DC constant voltage module for the DC/DC constant voltage module to adjust the output voltage output to the linear constant current module, and controls the DC/DC constant voltage module to operate according to the detected output voltage or a voltage fed back by the linear constant current module;
the first internal transceiver is connected with the linear constant current module through a differential bus to transmit a signal between the microcontroller unit and the linear constant current module;
the linear constant current module comprises a plurality of linear constant current driver ICs, the plurality of linear constant current driver ICs each contains a second internal transceiver, and a differential bus interface of the second internal transceiver is connected with a differential bus communication line connecting with a differential bus interface of the first internal transceiver, to communicate with the differential bus interface of the first internal transceiver;
the OLED panel light source comprises a plurality of OLED panels corresponding to the plurality of linear constant current driver ICs respectively, each of the plurality of OLED panels is controlled to emit light by an output channel of the each output channel corresponds to an OLED light-emitting area; and
ground ends of the DC/DC constant voltage module, the external transceiver, the first internal transceiver, the microcontroller unit, the linear constant current module, and the OLED panel light source are respectively connected with a negative pole of the vehicle power line.

2. The OLED light source drive control circuit according to claim 1 , wherein an anti-reverse circuit is further connected with a line between the DC/DC constant voltage module and the vehicle power line.

3. The OLED light source drive control circuit according to claim 2 , wherein the anti-reverse circuit comprises an anti-reverse diode or an anti-reverse PMOS circuit.

4. The OLED light source drive control circuit according to claim 1 , wherein the external transceiver is a LIN transceiver, the vehicle communication line is a LIN communication line; or the external transceiver is a CAN transceiver, and the vehicle communication line is a CAN communication line.

5. The OLED light source drive control circuit according to claim 1 , wherein the external transceiver is integrated into the microcontroller unit, and a low dropout regulator (LDO) is further integrated into the microcontroller unit.

6. The OLED light source drive control circuit according to claim 1 , wherein each of the plurality of linear constant current driver ICs includes a plurality of output channels correspondingly connected with a plurality of light emitting areas in an OLED panel.

7. The OLED light source drive control circuit according to claim 6 , wherein a number of the plurality of linear constant current driver ICs multiplied by a number of the plurality of output channels on a ≥a number of the OLED panels multiplied by a number of the plurality of light emitting areas on an OLED panel.

8. The OLED light source drive control circuit according to claim 6 , wherein an over-temperature detecting circuit is disposed adjacent to the OLED panel light source, and is connected with the microcontroller unit for detecting a temperature of the OLED panel light source, and transmitting the detected temperature to the microcontroller unit.

9. The OLED light source drive control circuit according to claim 8 , wherein the over-temperature detecting circuit comprises:
a PCB circuit board; and
a thermistor, a pull-up voltage dividing resistor, and an A/D sampling circuit disposed on the PCB circuit board, wherein
the thermistor is connected with the pull-up voltage dividing resistor, and
one end of the A/D sampling circuit is connected with a line between the thermistor and the pull-up voltage dividing resistor, and the other end of the A/D sampling circuit is connected with the A/D sampling port of the microcontroller unit.

10. The OLED light source drive control circuit according to claim 1 , wherein a dynamic effect of the OLED light source is controlled by the differential bus; a differential bus protocol used by the differential bus includes a high-speed digital communication bus protocol based on a UART protocol combined with a local differential bus physical layer structure.

11. The OLED light source drive control circuit according to claim 1 , wherein the first internal transceiver transmits a control signal with the second internal transceiver disposed in each of the plurality of linear constant current driver ICs, and the microcontroller unit transmits a control signal with the linear constant current module through the first internal transceiver.

12. The OLED light source drive control circuit according to claim 1 , wherein
a voltage of the OLED panel corresponding to the OLED light-emitting area on each channel of each of the plurality of linear constant current driver ICs is sampled through the differential bus communication line;
when the voltage of the OLED panel rises within a preset range, the microcontroller unit outputs a feedback signal to adjust the output voltage of the DC/DC constant voltage module, so that each of the plurality of linear constant current driver ICs has a sufficient voltage for increasing the voltage of the OLED panel; and
when the voltage of the OLED panel rises beyond the preset range, the microcontroller unit outputs a feedback signal to increase the output voltage of the DC/DC constant voltage module to a preset limit voltage, to maintain a preset constant output limit power to drive the OLED panel light source.

Assignees

• Hasco Vision Tech Co Ltd

Inventors

• Li Jiaying

Classifications

• H05B47/28

  Circuit arrangements for protecting against abnormal temperature · CPC title

• H05B47/21

  of two or more light sources connected in parallel · CPC title

• H05B45/52

  in a parallel array of LEDs · CPC title

• H05B45/395

  Linear regulators · CPC title

• H05B45/345

  Current stabilisation; Maintaining constant current · CPC title