Display device and method of driving the same
A display device includes a flexible display panel in which a valid display area viewable to a user is extended or reduced, a touch sensing part overlapping the flexible display panel and including first sensing electrodes and second sensing electrodes intersecting the first sensing electrodes, a touch driver for providing driving signals to the first sensing electrodes, and detecting a touch by using sensing signals supplied from the second sensing electrodes, and a display driver for driving the flexible display panel such that an image is displayed in the valid display area. The touch driver controls at least one of hidden driving signals and hidden sensing signals, which correspond to a hidden display area of the flexible display panel which is not viewable to the user, to be different from at least one of the driving signals and the sensing signals, which correspond to the valid display area.
1 . A display device, comprising:
a flexible display panel in which a valid display area viewable to a user is extended or reduced;
a touch sensing part overlapping the flexible display panel, and including first sensing electrodes and second sensing electrodes intersecting the first sensing electrodes;
a touch driver configured to provide driving signals to the first sensing electrodes, and detect a touch by using sensing signals supplied from the second sensing electrodes; and
a display driver configured to drive the flexible display panel such that an image is displayed in the valid display area,
wherein the touch driver is configured to:
inactivate touch detection of at least a portion of a hidden display area of the flexible display panel, based on a panel deformation signal generated by the touch driver indicating a hidden display area;
generate a profile of first edge sensing signals with respect to an actually touched area in an edge area of the valid display area;
generate a compensation profile of second edge sensing signals symmetrical to the profile of the first edge sensing signals with respect to a boundary line separating the valid display area and the hidden display area by copying the first edge sensing signals; and
determine a touch position of the actually touched area in the edge area, based on the profile of the first edge sensing signals and the compensation profile of the second edge sensing signals.
2 . The display device of claim 1 , wherein the touch driver comprises:
a touch processor configured to detect the touch through signal processing on the sensing signals; and
a partial driving controller configured to suspend supply of hidden driving signals or control driving of the touch processor with respect to hidden sensing signals, based on a panel deformation signal indicating the hidden display area.
3 . The display device of claim 2 , wherein the hidden driving signals are supplied as a constant voltage.
4 . The display device of claim 2 , wherein supply of the hidden sensing signals is suspended by a suspension of the supply of the hidden driving signals.
5 . The display device of claim 2 , wherein the partial driving controller activates touch detection of a compensation area as a portion of the hidden display area adjacent to the edge area, and inactivates touch detection of another area of the hidden display area.
6 . The display device of claim 5 , wherein the touch processor comprises:
an analog-digital converter configured to convert the sensing signals of the valid display area and the hidden sensing signals of the compensation area into digital sensing data; and
a touch position determiner configured to determine a touch position by calculating a center of gravity of a touched area, based on the digital sensing data.
7 . The display device of claim 6 , wherein the touch processor further comprises:
a signal processor configured to block digital conversion or signal processing on the hidden sensing signals corresponding to the another area of the hidden display area, based on the panel deformation signal.
8 . The display device of claim 7 , wherein, when the touched area overlaps the edge area, a profile of the digital sensing data corresponding to the edge area and the compensation area has a shape similar to a Gaussian distribution.
9 . The display device of claim 7 , wherein the compensation area is an area corresponding to a channel for the first sensing electrodes or an area corresponding to a channel for the second sensing electrodes.
10 . The display device of claim 2 , wherein a voltage level of the panel deformation signal is changed corresponding to a change in size of the hidden display area due to deformation of the flexible display panel.
11 . The display device of claim 10 , wherein the display driver includes an output pin outputting the panel deformation signal, and
wherein the touch driver includes an input pin receiving the panel deformation signal from the display driver.
12 . The display device of claim 10 , wherein the touch driver receives a command corresponding to the panel deformation signal through an interface with an external host, and changes the voltage level of the panel deformation signal, based on the command.
13 . The display device of claim 1 wherein the edge area is adjacent to the hidden display area.
14 . The display device of claim 1 , wherein the touch sensing part is deformed according to deformation of the flexible display panel.
15 . A method of driving a display device, the method comprising:
sensing extension or reduction of a valid display area of a flexible display panel;
inactivating touch detection of at least a portion of a hidden display area of the flexible display panel, based on a panel deformation signal indicating the hidden display area;
generating a profile of first edge sensing signals with respect to an actually touched area in an edge area of the valid display area;
generating a compensation profile of second edge sensing signals symmetrical to the profile of the first edge sensing signals with respect to a boundary line separating the valid display area and the hidden display area by copying the first edge sensing signals; and
determining a touch position of the actually touched area in the edge area, based on the profile of the first edge sensing signals and the compensation profile of the second edge sensing signals.
16 . The method of claim 15 , wherein, when inactivating the touch detection of the at least a portion of the hidden display area, supply of driving signals corresponding to the hidden display area is suspended.
17 . The method of claim 15 , wherein, when inactivating the touch detection of the at least a portion of the hidden display area, signal processing on sensing signals corresponding to the hidden display area is suspended.
18 . The method of claim 15 , wherein a voltage level of the panel deformation signal is changed corresponding to a change in size of the hidden display area due to deformation of the flexible display panel.