METHOD OF DRIVING LIGHT-SOURCE AND DISPLAY APPARATUS FOR PERFORMING THE METHOD
First Claim
Patent Images
1. A method of driving a light-source module, the method comprising:
- adjusting a frequency of a pulse width modulation (“
PWM”
) control signal having a current control pulse to control a light-emitting diode (“
LED”
) string of the light-source module, wherein the LED string comprises a plurality of LEDs connected to each other in series; and
controlling a control switching element, which is connected to an end portion of the LED string, in response to the PWM control signal.
0 Assignments
0 Petitions
Accused Products
Abstract
A method of driving a light-source module includes adjusting a frequency of a boosting switching signal based on a dimming signal which controls luminance of a light-emitting diode (“LED”) string of the light-source module, where the LED string comprises a plurality of LEDs connected to each other in series, and controlling a main transistor in response to the boosting switching signal to transfer a driving voltage to the LED string.
-
Citations
11 Claims
-
1. A method of driving a light-source module, the method comprising:
-
adjusting a frequency of a pulse width modulation (“
PWM”
) control signal having a current control pulse to control a light-emitting diode (“
LED”
) string of the light-source module, wherein the LED string comprises a plurality of LEDs connected to each other in series; andcontrolling a control switching element, which is connected to an end portion of the LED string, in response to the PWM control signal. - View Dependent Claims (2, 4, 5)
-
-
3. The method of claim 3, wherein the adjusting the frequency of the PWM control signal comprises:
-
generating a chopping wave of a second driving frequency higher than the first driving frequency when the level of the dimming signal, which controls luminance of the LED string, is less than the preset value; and adjusting the frequency of the PWM control signal to generate a second PWM control signal using the chopping wave of the second driving frequency.
-
-
6. A display apparatus comprising:
-
a display panel configured to receive an image signal and to display an image corresponding to the image signal; a light-source module comprising a light-emitting diode (“
LED”
) string, wherein the LED string comprises a plurality of LEDs connected to each other in series; anda light-source driving part comprising a main transistor, configured to adjust a frequency of a pulse width modulation (“
PWM”
) control signal having a current control pulse to control the LED string, and configured to control a control switching element, which is connected to an end portion of the LED string, in response to the PWM control signal. - View Dependent Claims (7, 8, 9, 10, 11)
-
Specification