TECHNICAL FIELD

The disclosure relates to a technical field of touch screens, and in particular to a method for driving a touch-and-display device, a driving circuit and a touch-and-display device.

BACKGROUND

In recent years, technologies of touch sensing have developed rapidly, and many consumer electronic products such as mobile phones, satellite navigation systems, tablet computers, personal digital assistants (PDA) and notebook computers have built-in touch functions. In the above-mentioned various electronic products, the region of the display panel is endowed with touch sensing function, that is, a display panel with simple display function is designed into a touch-and-display panel with both display and touch sensing functions. According to the different structural designs of a touch panel (touch screen or touch sensitive layer), the touch panel can be generally divided into out-cell or in-cell/on-cell touch panel. The out-cell touch panel is a combination of independent touch panel and general display panel, while the in-cell/on-cell touch panel directly sets the touch panel inside or outside the substrate in the display panel. Compared with the out-cell touch panel, the in-cell/on-cell touch panel has thinner thickness and higher light transmittance.

The touch panel is used for touch sensing operation, that is, users can touch the panel with fingers or other objects to perform various functions. The touch sensing operation of the touch panel may be interfered by the display operation of the display panel. Therefore, how to reduce the interference caused by the display operation of the display panel when the touch panel performs the touch sensing operation has become the goal of the industry.

SUMMARY

According to an aspect of the present disclosure, there is provided a method for driving an OLED touch-and-display device, the OLED touch-and-display device including a display panel including a plurality of rows of pixels, a plurality of gate driving lines (GL), and a plurality of light-emission control lines (EM) in one-to-one correspondence, wherein the method comprises: generating gate driving signals that are sequentially shifted (also referred to as “sequentially-shifted gate driving signals”) according to a clock cycle of a first clock signal (GCK) based on the first clock signal; sequentially applying the gate driving signals that are sequentially shifted to the plurality of gate driving lines; for each row of pixels, writing display data in a display driving period for the row of pixels, wherein a time length of the display driving period depends on a gate driving signal applied to a gate driving line corresponding to the row of pixels and is smaller than the clock cycle of the first clock signal; and for a display driving period for each row of pixels of at least one of the plurality of rows of pixels, setting a touch detection period for touch detection corresponding to the display driving period at least partially overlapping with the display driving period in time, or setting, at least partially overlapping with the display driving period in time, a touch detection period for touch detection corresponding to a display driving period for previous row of pixels of the row of pixels.

According to another aspect of the present disclosure, there is also provided a driving circuit for a display panel in an OLED touch-and-display device, the display panel including a plurality of rows of pixels, a plurality of gate driving lines (GL), and a plurality of light-emission control lines (EM) in one-to-one correspondence, and the driving circuit is designed to execute the method as described above.

According to another aspect of the present disclosure, there is also provided an OLED touch-and-display device, which includes a display panel including a plurality of rows of pixels, a plurality of gate driving lines (GL), and a plurality of light-emission control lines (EM) in one-to-one correspondence; a touch sensitive layer and a touch controller; and the driving circuit for driving the display panel.

According to the driving method, by shortening the display driving period for each row of pixels with respect to the clock cycle that the generation of the gate driving signals that are sequentially shifted (also referred to as “the shift of the gate driving signal”) is based on, i.e., shortening the data-writing time, the reserved time can be used as at least a part of the time for the touch detection operation, so that the touch detection operation is as less affected by the change in the voltage associated with the display data when the display driving is performed as possible, and in this case, by extending the time of each touch detection operation as much as possible, the real-time and accuracy of touch detection results are higher, and the touch detection period can be set only for a part of the display driving periods, thus reducing the possibility of mutual influence between touch detection and display driving, and further improving the accuracy of touch detection. In addition, in terms of frequency, since the display driving operation and the touch detection operation can also be regarded as being in a time-division manner, there is no need to consider the timing and frequency of various signals related to display driving operation when selecting the frequency of the driving signal for touch detection operation, so there can be more selectable frequencies to combat other noise sources. In addition, for the display quality of the display panel, the light-emission time length of each row of pixels is not affected, the average display luminance (related to the light-emission time length) of the plurality of rows of pixels can be approximately the same, thereby making the display luminance of the display panel uniform, so as to improve the display quality of the display panel.

