LED Driving Device and LED Driving Method
AssigneeSilicon Works Co., Ltd.
InventorsJi Hwan Kim, Jin Ho Choi, Jang Su Kim
Life of this patent
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Abstract
The present disclosure relates to an LED driving technology. According to the present disclosure, it is possible to increase the fineness of the gray scale without increasing a frequency of a clock by combining a plurality of driving current sources to generate a driving current supplied to one driving line.
Claims17
A light emitting diode (LED) driving device for driving a plurality of LEDs arranged on a panel, the LED driving device comprising:
- a plurality of driving current sources arranged parallel to each other;
- a pulse width modulation (PWM) controlling circuit configured to generate a plurality of PWM signals according to a gray scale value for an LED;
- and
- a plurality of switch circuits configured to control an output of each driving current source for the LED according to each PWM signal.
An LED driving device for driving an LED arranged on a panel, the LED driving device comprising:
- a first driving current source;
- a second driving current source arranged parallel to the first driving current source;
- a PWM controlling circuit configured to generate a first PWM signal and a second PWM signal by distributing a gray scale value for the LED;
- a first switch circuit configured to control an output of the first driving current source for the LED according to the first PWM signal;
- and
- a second switch circuit configured to control an output of the second driving current source for the LED according to the second PWM signal.
A method of driving a plurality of LEDs arranged on a panel, the method comprising:
- connecting one LED to one driving line according to a scan signal;
- identifying image data comprising a gray scale value for the one LED;
- dividing the gray scale value into N gray scale values (N is a natural number of 2 or higher) and generating a plurality of PWM signals according to the divided gray scale values;
- and
- controlling outputs of N driving power sources connected to the one driving line according to the plurality of PWM signals.
Dependencies are inferred from the claim text.