Display device having touch detection function and method

1. A display device having a touch detection function, comprising:

a display panel configured to perform a display operation based on a pixel signal in a display period;

a detector configured to perform a touch detection operation in touch detection periods including a first touch detection period and a second touch detection period; and

a driver configured to control frame operations including a first frame operation and a second frame operation, each of the frame operations being an operation for displaying an image of a single frame,

wherein

the driver is configured to:

control the first frame operation in a first frame period including the display period, the first touch detection period and a first display adjustment period; and

control the second frame operation in a second frame period including the display period, the first touch detection period and a second display adjustment period,

the second display adjustment period is longer than the first display adjustment period,

the second display adjustment period includes the second touch detection period,

the first touch detection period is divided into a plurality of first touch detection sub-periods,

the second touch detection period includes at least one second touch detection sub-period,

a length of each of the first touch detection sub-periods is the same as a length of the at least one second touch detection sub-period, and

the driver is configured to control such that

the plurality of first touch detection sub-periods are provided at a first interval,

the at least one second touch detection sub-period is a plurality of second touch detection sub-periods provided at the first interval in the second display adjustment period.

2. The display device of claim 1 , wherein

the driver is configured to control such that a length of the display period and the first touch detection period included in the second frame period is equal to a length of the display period and the first touch detection period included in the first frame period.

3. The display device of claim 1 , wherein

the driver is configured to control such that the touch detection operation is not performed in the first display adjustment period.

4. The display device of claim 1 , further comprising a memory to which pixel data is written from outside, wherein

the display panel is configured to perform the display operation based on a pixel signal generated from the pixel data written to the memory, and

the driver is configured to perform the first frame operation or the second frame operation based on the pixel data written to memory.

5. The display device of claim 1 , wherein

the detector comprises a plurality of drive electrodes to which a touch drive voltage is applied in the touch detection periods, and

the driver is configured to control a cycle for applying the touch drive voltage to the drive electrodes independently from a cycle for displaying the image of a single frame.

6. The display device of claim 5 , wherein

the display panel comprises a plurality of common electrodes to which a display drive voltage is applied in the display period, and

the common electrodes are used as the drive electrodes.

7. The display device of claim 1 , wherein

each of the first display adjustment period and the second display adjustment period includes a perpendicular back porch period for inverting a polarity of display of the image, and a perpendicular front porch period provided before the perpendicular back porch period, and

the driver is configured to

extend the perpendicular front porch period of the second display adjustment period, and

allocate the second touch detection period to the extended perpendicular front porch period.

8. A method comprising:

performing a display operation for displaying an image based on a pixel signal in a display period;

performing a touch detection operation in touch detection periods including a first touch detection period and a second detection period; and

controlling frame operations including a first frame operation and a second frame operation, each of the frame operations being an operation for displaying an image of a single frame,

wherein

the controlling frame operations comprises:

controlling the first frame operation in a first frame period including the display period, the first touch detection period and a first adjustment period; and

controlling the second frame operation in a second frame period including the display period, the first touch detection period and a second adjustment period,

the second display adjustment period is longer than the first display adjustment period,

the second display adjustment period includes the second touch detection period,

the first touch detection period is divided into a plurality of first touch detection sub-periods,

the second touch detection period includes at least one second touch detection sub-period,

a length of each of the first touch detection sub-periods is the same as a length of the at least one second touch detection sub-period,

controlling the second frame operation comprises:

performing the touch detection operation in the plurality of first touch detection sub-periods, and

performing the touch detection operations in a plurality of the second touch detection sub-periods, and

the first touch detection sub-periods and the second touch detection sub-periods are arranged at a same interval.

9. The method of claim 8 , wherein

a length of the display period and the first touch detection period included in the second frame period is equal to a length of the display period and the first touch detection period included in the first frame period.

10. The method of claim 8 , wherein

the controlling the first frame operation does not comprise performing the touch detection operation in the first display adjustment period.

11. The method of claim 8 , further comprising writing pixel data from outside to a memory, wherein

the performing the display operation comprises performing the display operation based on a pixel signal generated from the pixel data written to the memory, and

the controlling the frame operations comprises performing the first frame operation or the second frame operation based on the pixel data written to the memory.

12. The method of claim 8 , wherein

the performing the touch detection operation comprises controlling a cycle for applying a touch drive voltage to a plurality of drive electrodes to which the touch drive voltage is applied in the touch detection periods such that the cycle is independent from a cycle for displaying the image of a single frame.

13. The method of claim 12 , wherein

the performing display operation comprises applying a display drive voltage to the drive electrode in the display period.

14. The method of claim 8 , wherein

each of the first display adjustment period and second display adjustment period comprises a perpendicular back porch period for inverting a polarity of display of the image, and a perpendicular front porch period provided before the perpendicular back porch period, and

the controlling the second frame operation comprises:

extending the perpendicular front porch period; and

allocating the second touch detection period to the extended perpendicular front porch period.

15. The display device of claim 1 , wherein

the first display adjustment period does not include the first touch detection period.

16. The display device of claim 1 , wherein

the second touch detection period is divided into the plurality of the second touch detection sub-periods.

17. The display device of claim 1 , wherein

a period, to which a display period and a touch detection period for lines of fractions of the lines driven in the display period are allocated, is set before the second display adjustment period.