Driving apparatus and method for liquid crystal display
View Patent ↗A driving apparatus and apparatus for a liquid crystal display wherein an image format of an NTSC image signal can be selectively converted in response to an instruction of a user. In the apparatus, a liquid crystal display panel has liquid crystal cells arranged at intersections between gate lines and data lines to display an image signal in an image format different from an input image signal. A switch generates a pulse signal by an operation of a user. A counter counts said pulse signal. A timing controller changes an image format of said image signal displayed on the liquid crystal display panel in response to an input signal from the counter.
1. A driving apparatus for a liquid crystal display, comprising:
a liquid crystal display panel with liquid crystal cells arranged at crossings of gate lines and data lines;
a switch that generates a pulse signal upon an actuation of the switch;
a counter that receives pulse signals from the switch and that outputs a count signal that corresponds to a count of actuations of the switch; and
a timing controller that changes an image format of an input image signal into a display image signal having a selected image format to be displayed on the liquid crystal display panel, the selected image format selected in response to the count signal output by the counter.
2. The driving apparatus as claimed in claim 1 , further comprising:
a flip-flop arranged between the switch and the counter, the flip-flop eliminating noise in the pulse signals received by the counter from the switch.
3. The driving apparatus as claimed in claim 2 , wherein at least one of the counter and the flip-flop is built in the timing controller.
4. The driving apparatus as claimed in claim 1 , further comprising:
an image signal processor that receives the input image signal;
a data driver that drives data lines of the liquid crystal display panel; and
a gate driver that drives gate lines of the liquid crystal display panel.
5. The driving apparatus as claimed in claim 4 , wherein the selected image format is any of:
a first image format that maintains a ratio of horizontal width to vertical width of the image signal inputted to the timing controller is displayed on the liquid crystal display panel unchanged;
a second image format that enlarges a ratio of horizontal width to vertical width such that the image signal inputted to the timing controller is displayed on the entire field of the liquid crystal display panel; and
a third image format that enlarges a ratio of horizontal width to vertical width such that an image format of the image signal inputted to the timing controller is displayed on the liquid crystal display panel.
6. The driving apparatus as claimed in claim 5 , wherein the first image format includes:
the input image signal; and
a black signal displayed at the periphery of the image signal.
7. The driving apparatus as claimed in claim 5 , wherein the third image format includes:
an image signal displayed after being enlarged constantly at a ratio of horizontal width to vertical width from the input image signal; and
a black signal displayed on the upper and lower edges of the image signal.
8. The driving apparatus as claimed in claim 5 , wherein the third image format includes:
an image signal displayed after being enlarged constantly at a ratio of horizontal width to vertical width from an image format of the input image signal; and
a black signal displayed on the left and right edges of the image signal.
9. The driving apparatus as claimed in claim 5 , wherein the timing controller selects any one of the first to third image formats in response to an input signal from the counter as the selected image format, and controls the gate driver and the data driver in accordance with the selected image format.
10. The method as claimed in claim 5 , wherein the third image format includes:
an image signal displayed with being enlarged constantly at a ratio of horizontal width to vertical width from an image format of the input image signal; and
a black signal displayed on the upper and lower edges of the image signal.
11. The method as claimed in claim 1 , further comprising the step of:
eliminating a noise of the pulse signal to apply it to the counter.
12. A driving apparatus for a liquid crystal display, comprising:
a liquid crystal display panel that displays an input image signal;
a data converter that changes a ratio of horizontal width to vertical width of the image signal displayed on the liquid crystal display panel to thereby change an image format of the image signal; and
a data driver that applies the image signal from the data converter to the liquid crystal display panel in accordance with the changed image format,
wherein the data converter includes:
a switch for generating a pulse signal by an operation of a user;
a counter that receives pulse signals generated by the switch and that outputs a count signal that corresponds to a count of operations of the switch by the user, wherein each operation of the switch by the user increments the counter; and
a timing controller for changing an image format of the image signal to be displayed on the liquid crystal display panel to a selected image format selected in response to the count signal output by the counter.
13. A driving apparatus for a liquid crystal display, comprising:
a liquid crystal display panel that displays an input image signal;
a data converter that changes a ratio of horizontal width to vertical width of the image signal displayed on the liquid crystal display panel to thereby change an image format of the image signal; and
a data driver that applies the image signal from the data converter to the liquid crystal display panel in accordance with the changed image format,
wherein the data converter includes:
a switch for generating a pulse signal by an operation of a user;
a counter that receives pulse signals generated by the switch and that outputs a count signal that corresponds to a count of operations of the switch by the user; and
a timing controller for changing an image format of the image signal to be displayed on the liquid crystal display panel to a selected image format selected in response to the count signal output by the counter.
14. The driving apparatus as claimed in claim 13 , wherein the data converter includes:
a flip-flop arranged between the switch and the counter and eliminating a noise of the pulse signal to apply it to the counter.
15. The driving apparatus as claimed in claim 13 , further comprising:
an image signal processor that receives the image signal; and
a gate driver that applies a scanning signal to the liquid crystal display panel.
16. The driving apparatus as claimed in claim 15 , wherein the selected image format includes one of:
a first image format maintained at a ratio of horizontal width to vertical width as it is such that an image format of the image signal inputted to the timing controller is displayed on the liquid crystal display panel as it is;
a second image format enlarged at a ratio of horizontal width to vertical width such that an image format of the image signal inputted to the timing controller is displayed on the entire field of the liquid crystal display panel; and
a third image format enlarged constantly at a ratio of horizontal width to vertical width such that an image format of the image signal inputted to the timing controller is displayed on the liquid crystal display panel.
17. The driving apparatus as claimed in claim 16 , wherein the first image format includes:
the input image signal; and
a black signal displayed at the periphery of the image signal.
18. The driving apparatus as claimed in claim 16 , wherein the third image format includes:
an image signal displayed with being enlarged constantly at a ratio of horizontal width to vertical width from an image format of the input image signal; and
a black signal displayed on the upper and lower edges of the image signal.
19. The driving apparatus as claimed in claim 16 , wherein the third image format includes:
an image signal displayed with being enlarged constantly at a ratio of horizontal width to vertical width from an image format of the input image signal; and
a black signal displayed on the left and right edges of the image signal.
20. The driving apparatus as claimed in claim 16 , wherein the timing controller selects any one of the first to third image formats in response to an input signal from the counter as the selected image format, and controls the gate driver and the data driver in accordance with the selected image format.
21. A method of driving a liquid crystal display, comprising the steps of:
providing a liquid crystal display panel, having liquid crystal cells arranged at intersections between gate lines and data lines, for displaying an image signal in an image format different from an input image signal;
generating a pulse signal by an operation of a user;
counting pulse signals generated by operation of the user using a counter to generate a count signal that corresponds to a count of operations of the user; and
changing an image format of the image signal displayed on the liquid crystal display panel to a selected image format selected in response to the count signal output from the counter.
22. The method as claimed in claim 21 , wherein the selected image format includes:
a first image format maintained at a ratio of horizontal width to vertical width as it is such that an image format of the image signal inputted to the timing controller is displayed on the liquid crystal display panel as it is;
a second image format enlarged at a ratio of horizontal width to vertical width such that an image format of the image signal inputted to the timing controller is displayed on the entire field of the liquid crystal display panel; and
a third image format enlarged constantly at a ratio of horizontal width to vertical width such that an image format of the image signal inputted to the timing controller is displayed on the liquid crystal display panel.
23. The method as claimed in claim 21 , wherein the first image format includes:
the input image signal; and
a black signal displayed at the periphery of the image signal.
24. The method as claimed in claim 21 , wherein the third image format includes:
an image signal displayed with being enlarged constantly at a ratio of horizontal width to vertical width from an image format of the input image signal; and
a black signal displayed on the left and right edges of the image signal.
25. The method as claimed in claim 21 , wherein the step of changing an image format of said image signal displayed on the liquid crystal display panel includes:
selecting any one of the first to third image formats in response to an input signal from the counter; and
controlling a gate driver for driving the gate lines and a data driver for driving the data lines in accordance with the selected image format.