Display controller and method of controlling the same
A display controller according to one embodiment of the present invention includes a control pulse generating part outputting control pulse to a data line controller and a scan line controller driving a display panel, and an intermittent clock generating part generating an intermittent clock synchronized with a reference clock and setting a clock interval based on a timing setting value setting a timing at which the control pulse changes in a predetermined period.
1 . A display controller comprising:
a control pulse generating part outputting control pulse to a data line controller and a scan line controller driving a display panel; and
an intermittent clock generating part generating an intermittent clock synchronized with a reference clock and setting a clock interval based on a timing setting value setting a timing at which the control pulse changes in a predetermined period.
2 . The display controller according to claim 1 , further comprising a first setting register storing the timing setting value and a second setting register storing a relation between a timing at which the control pulse changes and a number of clocks of the intermittent clock input in a predetermined period.
3 . The display controller according to claim 1 , wherein the timing setting value is a value defining a relation between a number of clocks of the reference clock input in a predetermined period and a timing at which the control pulse changes in the predetermined period.
4 . The display controller according to claim 1 , wherein the reference clock has a frequency twice as much as a frequency of the intermittent clock.
5 . The display controller according to claim 2 , wherein the values stored in the first and second setting registers are changed based on data input from an outside.
6 . The display controller according to claim 1 , wherein the control pulse includes a plurality of control signals, and each of the plurality of control signals changes a signal level based on the intermittent clock.
7 . The display controller according to claim 1 , further comprising:
a reference clock generating part dividing a frequency of an original clock input from an outside or generated inside to generate the reference clock; and
a control register storing a setting of a frequency dividing ratio of the reference clock generating part.
8 . The display controller according to claim 1 , wherein the data line controller drives pixels arranged in columns in the display panel, and the scan line controller drives pixels arranged in rows in the display panel.
9 . A method of controlling a display controller controlling a data line controller and a scan line controller driving a display panel by using a control pulse, the method comprising:
generating an intermittent clock synchronized with a reference clock and including an interval based on a timing setting value setting a timing at which the control pulse changes, and
generating the control pulse based on the intermittent clock.