Driving circuit and illumination device

• US 10,448,475 B2
• Filed: 01/08/2018
• Issued: 10/15/2019
• Est. Priority Date: 04/12/2017
• Status: Active Grant

• Current Assignee: Silicon Touch Technology Inc.
• Original Assignee: Silicon Touch Technology Inc.
• Inventors: Chin, Chi-Yuan, Chen, Kuei-Jyun
• Primary Examiner(s): Tran, Thuy V
• Application Number:
  US15/864,423
• Publication Number:
  US 20180302968A1
• Time in Patent Office: 645 Days
• Field of Search: 315185 R, 315291, 315307, 315308
• CPC Class Codes: H05B 45/14 using electrical feedback from LEDs or from LED modules
• CPC Class Codes: H05B 45/30 Driver circuits

Abstract

A driving circuit for driving a light emitting diode module includes: a control module; a driving module electrically connected to the control module and the light emitting diode module for providing a plurality of driving signals to drive the light emitting diode module; and a detecting module electrically connected to the light emitting diode and the control module, the detecting module detecting a voltage or a current of the light emitting diode module and transmitting a detecting signal corresponding to the voltage or the current of the light emitting diode module to the control module. The control module adjusts a waveform of at least one driving signal of the driving signals for driving the light emitting diode module to illuminate uniformly at a driving time interval of the at least one driving signal of the driving signals.

Claims

1. A driving circuit for driving a light emitting diode module, the driving circuit comprising:

a control module;

a driving module electrically connected to the control module and the light emitting diode module for providing a plurality of driving signals to drive the light emitting diode module; and

a detecting module electrically connected to the light emitting diode module and the control module, the detecting module detecting a voltage or a current of the light emitting diode module and transmitting a detecting signal corresponding to a voltage change of the voltage or a current change of the current of the light emitting diode module to the control module, wherein the voltage or the current of the light emitting diode module is distorted;

wherein the control module adjusts a rising time interval or a falling time interval of a waveform of at least one driving signal of the driving signals for driving the light emitting diode module to illuminate uniformly at a driving time interval of the at least one driving signal of the plurality of driving signals according to the voltage change of the voltage or the current change of the current of the light emitting diode module, when the light emitting diode module illuminates uniformly, a waveform of an adjusted voltage or an adjusted current of the light emitting diode module is a square wave.

2. The driving circuit of claim 1, wherein the detecting module further detects a voltage difference at a predetermined time of the light emitting diode module or a current difference at a predetermined time of the light emitting diode module.

3. The driving circuit of claim 2, wherein the predetermined time includes one picosecond or a number of microseconds.

4. The driving circuit of claim 1, wherein the control module comprises:

a compensation unit adjusting the waveform of the at least one driving signal of the driving signals.

5. The driving circuit of claim 1, wherein the control module comprises:

a storage unit storing a plurality of compensation parameters for adjusting the waveforms of the driving signals.

6. An illumination device, comprising:

a light emitting diode module;

a control module;

a driving module electrically connected to the control module and the light emitting diode module for providing a plurality of driving signals to drive the light emitting diode module; and

a detecting module electrically connected to the light emitting diode module and the control module, the detecting module detecting a voltage or a current of the light emitting diode module and transmitting a detecting signal corresponding to a voltage change of the voltage or a current change of the current of the light emitting diode module to the control module;

wherein the control module adjusts a rising time interval or a falling time interval of a waveform of at least one driving signal of the driving signals for driving the light emitting diode module to illuminate uniformly at a plurality of driving time interval of the at least one driving signal of the plurality of driving signals according to the voltage change of the voltage or the current change of the current of the light emitting diode module, when the light emitting diode module illuminates uniformly, a waveform of an adjusted voltage or an adjusted current of the light emitting diode module is a square wave.

7. The illumination device of claim 6, wherein the light emitting diode module comprises:

a first light emitting diode group; and

a second light emitting diode group;

wherein the driving module provides a plurality of first driving signals and a plurality of second driving signals to drive the first light emitting diode group and the second light emitting diode group, respectively;

wherein the control module adjusts at least one first driving signal of the first driving signals based on a first detecting signal of the first light emitting diode group for adjusting a waveform of at least one first driving signal of the first driving signals, and driving the first light emitting diode module to illuminate uniformly at a driving time interval of an adjusted first driving signal, and

the control module adjusts at least one second driving signal of the second driving signals based on a second detecting signal of the second light emitting diode group for adjusting a waveform of at least one second driving signal of the second driving signals, and driving the second light emitting diode module to illuminate uniformly at a driving time interval of an adjusted second driving signal.