Display device and driving method with variable frequency of display according to fingerprint sensing
A display device includes: a display panel including a sensing area having display pixels and sensing pixels; a sensing panel overlapping with the display panel, the sensing panel including sensing electrodes; a fingerprint sensor overlapping with the sensing panel, the fingerprint sensor having light emitting elements of the display pixels and light receiving elements of the sensing pixels; a panel driver configured to drive the display panel; and a sensor driver configured to drive the sensing panel and the fingerprint sensor, wherein the panel driver and the sensor driver are configured to vary a driving mode according to an operation of the fingerprint sensor.
1. A display device comprising:
a display panel including a sensing area having display pixels and sensing pixels, each display pixel comprising a plurality of sub-pixels, and at least one sensing pixel is located outside a periphery of a corresponding one of the display pixels;
a sensing panel overlapping with the display panel, the sensing panel including sensing electrodes;
a fingerprint sensor overlapping with the sensing panel, the fingerprint sensor having light emitting elements of the display pixels and light receiving elements of the sensing pixels;
a panel driver configured to drive the display panel; and
a sensor driver configured to drive the sensing panel and the fingerprint sensor,
wherein the panel driver and the sensor driver are configured to vary a driving mode according to an operation of the fingerprint sensor such that in response to the fingerprint sensor not being operated, the driving mode of sensor driver is configured to drive the sensing panel in a self-capacitance manner and a mutual capacitance manner, and in response to the fingerprint sensor being operated, the driving mode of the sensor driver is configured to drive the sensing panel in the mutual capacitance manner.
2. The display device of claim 1 , wherein, in response to the fingerprint sensor not being operated, the panel driver is configured to drive the display panel at a variable frequency according to an image displayed on the display panel.
3. The display device of claim 1 , wherein, in response to the fingerprint sensor being operated, the panel driver is configured to drive the display panel at a fixed frequency.
4. The display device of claim 1 , wherein, in response to the fingerprint sensor being operated, the panel driver is configured to drive only a partial area of the display panel at a fixed frequency.
5. The display device of claim 1 , wherein, in response to the fingerprint sensor not being operated, the sensor driver is configured to output, to the sensing panel, an initial signal for searching whether or not a pen exists.
6. The display device of claim 5 , wherein, in response to the fingerprint sensor not being operated, the sensor driver is configured to output a driving signal to the fingerprint sensor to correspond to a frame frequency of the display panel.
7. The display device of claim 1 , wherein, in response to the fingerprint sensor being operated, the sensor driver is configured to drive the sensing panel in a mutual capacitance manner and a self-capacitance manner by changing a sensing cycle of the self-capacitance manner.
8. The display device of claim 1 , wherein, the sensor driver is configured to output an initial signal for whether or not a pen exists to the sensing panel, and in response to the fingerprint sensor being operated, the sensor driver is configured to discontinue outputting, to the sensing panel, the initial signal for searching whether or not a pen exists.
9. The display device of claim 1 , wherein, in response to the fingerprint sensor being operated, the sensor driver is configured to output a driving signal corresponding to a fixed frequency to the fingerprint sensor.
10. A method of driving a display device including a display panel including a sensing area having display pixels and sensing pixels, each display pixel comprising a plurality of sub-pixels, at least one sensing pixel is located outside a periphery of a corresponding one of the display pixels, a sensing panel overlapping the display panel and including sensing electrodes, and a fingerprint sensor overlapping the sensing panel, and configured with light emitting elements of the display pixels and light receiving elements of the sensing pixels, the method comprising:
determining whether or not the fingerprint sensor is operated;
driving the display panel, the sensing panel, and the fingerprint sensor in a first mode, in response to the fingerprint sensor not being operated; and
driving the display panel, the sensing panel, and the fingerprint sensor in a second mode, in response to the fingerprint sensor being operated,
wherein in the first mode, the sensing panel is driven in a self-capacitance manner and a mutual capacitance manner in response to the fingerprint sensor not being operated, and
wherein in the second mode, the sensing panel is driven in the mutual capacitance manner in response to the fingerprint sensor being operated.
11. The method of claim 10 , wherein, in the first mode, the display panel is driven at a variable frequency according to an image displayed on the display panel.
12. The method of claim 10 , wherein, in the first mode, a driving signal is output to the fingerprint sensor to correspond to a frame frequency of the display panel.
13. The method of claim 10 , wherein, in the second mode, the display panel is driven at a fixed frequency.
14. The method of claim 10 , wherein, in the second mode, a partial area of the display panel is only driven at a fixed frequency.
15. The method of claim 10 , further comprising, outputting an initial signal for whether or not a pen exists to the sensing panel, and in the second mode, discontinuing outputting the initial signal for searching whether or not a pen exists.
16. The method of claim 10 , wherein, in the second mode, a driving signal corresponding to a fixed frequency is output to the fingerprint sensor.