Method of controlling display driver IC with improved noise characteristics
Provided is a method of controlling a display driver IC. The method includes controlling an application processor to operate in a frequency range, which is changed from an operating frequency range of a preset specification and is a range in which data noise is decreased, through a plurality of frequency noise filtering operations.
1. A method of controlling a display driver IC, comprising:
changing an operating frequency of data transmitted from an application processor to a timing controller, from the timing controller to a source driver, and from the timing controller to a gate driver to a new frequency range in response to a communication environment; and
performing frequency noise filtering operations to detect a frequency range in which noise is decreased with respect to each of a first frequency, a second frequency, and a third frequency, the first frequency referring to an operating frequency between the application processor and the timing controller, the second frequency referring to an operating frequency between the timing controller and the source driver, and the third frequency referring to an operating frequency between the timing controller and the gate driver.
2. The method of claim 1 , wherein the performing of the frequency noise filtering operations comprise performing a first frequency noise filtering operation, selectively performing a second frequency noise filtering operation, and a selectively performing third frequency noise filtering operation.
3. The method of claim 2 , comprising:
performing the second frequency noise filtering operation in response to a frequency range in which noise is decreased being not sufficiently filtered out through the first frequency noise filtering operation.
4. The method of claim 3 , wherein the first frequency noise filtering operation is performed using a data scramble.
5. The method of claim 3 , wherein the second frequency noise filtering operation is performed using a spread spectrum clock generation technology.
6. The method of claim 5 , wherein the spread spectrum clock generation technology comprises setting each of the first to third frequencies to a basic frequency and spreading a clock with a modulation ratio.
7. The method of claim 2 , comprising:
performing the third frequency noise filtering operation in response to a frequency range in which noise is decreased being not sufficiently filtered out through the second frequency noise filtering operation.
8. The method of claim 7 , wherein the third frequency noise filtering operation comprises checking data noise at intervals of a frequency unit and detecting minimum and maximum values of a corresponding operating frequency.
9. The method of claim 8 , wherein the third frequency noise filtering operation is performed using software or hardware.