Display device
A display device includes a display panel which displays an image, a touch sensor which senses a touch, a display controller which drives the display panel, and a touch controller which drives the touch sensor. The display controller transfers a timing signal representing a timing of a display operation to the touch controller, and provides display driving information to the touch controller by modulating the timing signal in a blank period of a frame period.
1. A display device comprising:
a display panel which displays an image;
a touch sensor which senses a touch;
a display controller which drives the display panel; and
a touch controller which drives the touch sensor,
wherein the display controller transfers a timing signal representing a timing of a display operation to the touch controller, and provides display driving information to the touch controller by modulating the timing signal in a blank period of a frame period.
2. The display device of claim 1 , wherein the display controller provides the display driving information to the touch controller by modulating at least one of:
a pulse existence of the timing signal in each of horizontal time durations of the blank period;
a pulse phase of the timing signal in the blank period; and
a pulse width of the timing signal in the blank period.
3. The display device of claim 1 , wherein the display driving information includes at least one of:
frame rate information about a frame rate at which the display panel is driven;
scan mode information for the display panel; and
driving voltage information for the display panel.
4. The display device of claim 1 , wherein the timing signal includes:
a vertical synchronization signal representing a timing of the frame period; and
a horizontal synchronization signal representing a timing of each of horizontal time durations.
5. The display device of claim 4 , wherein the display controller transfers driving information data representing the display driving information to the touch controller in the blank period by encoding the horizontal synchronization signal in the blank period such that whether the horizontal synchronization signal has a pulse in each of horizontal time durations of the blank period is mapped to each bit of the driving information data.
6. The display device of claim 5 , wherein the display controller toggles the vertical synchronization signal at a start time point of the blank period to inform the touch controller of a transfer start timing of the driving information data.
7. The display device of claim 5 , wherein the display controller modulates the vertical synchronization signal such that the vertical synchronization signal has a first edge at a start time point of the blank period to inform the touch controller of a transfer start timing of the driving information data, and has a second edge at an end time point of the blank period to inform the touch controller of a transfer end timing of the driving information data.
8. The display device of claim 4 , wherein the display controller transfers driving information data representing the display driving information to the touch controller in the blank period by encoding the horizontal synchronization signal in the blank period such that a phase of a pulse of the horizontal synchronization signal from a start time point of the blank period is mapped to the driving information data.
9. The display device of claim 8 , wherein the display controller toggles the vertical synchronization signal at the start time point of the blank period to inform the touch controller of a transfer start timing of the driving information data.
10. The display device of claim 8 , wherein the display controller modulates the vertical synchronization signal such that the vertical synchronization signal has a first edge at the start time point of the blank period to inform the touch controller of a transfer start timing of the driving information data, and has a second edge at an end time point of the blank period to inform the touch controller of a transfer end timing of the driving information data.
11. The display device of claim 4 , wherein the display controller transfers driving information data representing the display driving information to the touch controller in the blank period by encoding the vertical synchronization signal in the blank period such that a width of a pulse of the vertical synchronization signal in the blank period is mapped to the driving information data.
12. The display device of claim 11 , wherein the display controller periodically toggles the horizontal synchronization signal in the blank period.
13. The display device of claim 11 , wherein the display controller maintains the horizontal synchronization signal at a constant level in the blank period to inform the touch controller of a transfer timing of the driving information data.
14. The display device of claim 4 , wherein the display controller transfers driving information data representing the display driving information to the touch controller in the blank period by encoding the vertical synchronization signal in the blank period such that a phase of a pulse of the vertical synchronization signal from a start time point of the blank period is mapped to the driving information data.
15. The display device of claim 14 , wherein the display controller periodically toggles the horizontal synchronization signal in the blank period.
16. The display device of claim 14 , wherein the display controller maintains the horizontal synchronization signal at a constant level in the blank period to inform the touch controller of a transfer timing of the driving information data.
17. The display device of claim 1 , wherein the timing signal includes:
a data enable signal representing a timing of effective image data; and
a horizontal synchronization signal representing a timing of each of horizontal time durations.
18. The display device of claim 17 , wherein the display controller provides the display driving information to the touch controller by modulating at least one of:
a pulse existence of the data enable signal in each of horizontal time durations of the blank period;
a pulse phase of the data enable signal in the blank period; and
a pulse width of the data enable signal in the blank period.
19. A display device comprising:
a display panel which displays an image;
a peripheral device; and
a display controller which drives the display panel,
wherein the display controller transfers a timing signal representing a timing of a display operation to the peripheral device, and provides display driving information to the peripheral device by modulating the timing signal in a blank period of a frame period.
20. The display device of claim 19 , wherein the peripheral device includes at least one of:
a touch sensing device which senses a touch;
an electro-magnetic resonance digitizer which senses an electro-magnetic resonance pen;
a Wi-Fi device which performs Wi-Fi communication; and
a Bluetooth device which performs Bluetooth communication.