TW201915691A - Touch display apparatus and touch and display scanning method thereof - Google Patents

Abstract

A touch display apparatus and a touch and display scanning method thereof are provided. The touch and display scanning method includes: dividing a frame period to a first sub-time period and a second sub-time period; operating a display scanning operation on a first part scan lines of a plurality of display scan lines during the first sub-time period, and operating a touch detection operation on the touch display apparatus during the first sub-time period; and, operating the display scanning operation on a second part scan lines of the display scan lines during the second sub-time period, and operating the touch detection operation on the touch display apparatus during the second sub-time period.

Description

Touch display device and its touch and display scanning method

The present invention relates to a touch display device and its touch and display scanning method, and in particular to a touch display device and its touch and display scanning method that can increase the scanning frequency of touch detection.

With the advancement of electronic technology, providing a touch interface on a display panel has become a common human-machine interface for electronic devices today.

In the integrated touch display device, the actions of touch detection and display scanning need to be performed separately within a set time interval. In the conventional technical field, long vertical mode (long V mode) and long horizontal mode (long H mode) are common.

In the long vertical mode, touch detection is performed in a non-display time interval (vertical blank time interval) where display scanning is not performed. In this mode, the interference of the horizontal line (H-line) on the display screen can be avoided, but it is limited by the time required for display scanning. The scanning frequency of touch detection in long vertical mode is lower It is difficult to meet the needs of the client.

In addition, in the long horizontal mode, the touch detection and display scanning actions can be interleaved according to the scanned area. This mode can effectively increase the frequency of touch detection, but it is easy to cause the interference phenomenon of H-line on the display screen. Moreover, such a mode requires a buffer to temporarily store the display data of the display screen.

The invention provides a touch display device and a touch and display scanning method thereof, which can effectively increase the scanning frequency of touch detection.

The touch and display scanning method of the present invention includes: distinguishing the frame time period into a first sub-time period and a second sub-time period; and performing on a plurality of first partial scan lines among multiple display scan lines in the first sub time period Display a scanning action, and perform a touch detection action on the touch display device; and, perform a display scanning action on a plurality of second partial scan lines in the display scan line during a second sub-time period, and, perform a touch display The device performs touch detection.

The touch display device of the present invention includes a touch display panel, a display scan driver, a touch detector, and a controller. The display scan driver is coupled to the multiple display scan lines of the touch control display panel. The touch detector is coupled to the touch control display panel. The controller, coupled to the display scan driver and the touch detector, is used to: distinguish the frame time period into a first sub-time period and a second sub-time period; during the first sub-time period, the display scan driver scans the display The plurality of first partial scan lines in the line perform the display scan action and cause the touch detector to perform the touch detection action; and, during the second sub-time period, the display scan driver The two partial scan lines perform the display scanning action, and enable the touch detector to perform the touch detection action.

Based on the above, the touch display device and the touch and display scanning method of the present invention, by making the scanning operation of the display scanning line be performed at different intervals in the frame time period, and in the time interval after the completion of each scanning operation Perform touch detection actions. In this way, the touch display device does not need to provide an extra buffer to temporarily store the display data, and can simultaneously increase the execution frequency of the touch detection action and improve the working performance of the touch display device.

In order to make the above-mentioned features and advantages of the present invention more obvious and understandable, the embodiments are specifically described below and described in detail in conjunction with the accompanying drawings.

Please refer to FIG. 1. FIG. 1 is a flowchart illustrating the touch and display scanning method according to an embodiment of the present invention. The method flow of FIG. 1 is applicable to a touch display device. Wherein, in step S110, a frame time period is divided into a first sub-time period and a second sub-time period, and, in step S120, a plurality of first scan time A part of the scan lines performs a display scanning operation, and performs a touch detection operation on the touch display device. Next, in step S130, a display scanning operation is performed on a plurality of second partial scanning lines out of the first partial scanning line among the plurality of display scanning lines in the second sub-time period, and touch detection is performed on the touch display device测 运动。 Measuring action.

In detail, in step S120, by performing a display scanning operation on a plurality of first partial scan lines, the display operation of the first partial display area can be performed on the display panel. In addition, in step S130, the display scanning operation is performed on a plurality of second partial scan lines, and the display operation of the second partial display area is performed on the display panel. In this embodiment, the first partial display The area and the second partial display area are two non-overlapping display areas, and the combination of the first partial display area and the second partial display area may be equal to the entire display area of the entire display panel.

To further explain, the first partial scan line and the second partial scan line are different scan lines. Specifically, in an embodiment of the present invention, the first partial scan line may be the odd-numbered trace in the display scan line, and the second partial scan line may be the even-numbered trace in the display scan line. For example, if all display scan lines have 1024 scan lines as an example, the first part of the scan lines may be 1, 3,..., 1023 scan lines, and the second part of the scan lines may be 2, 4, .., 1024 scanning lines.

Of course, the first partial scan line and the second partial scan line can also be configured through other implementations. For example, following the above example, the first partial scan line may be the first to the 512th scan line, and the second partial scan line may be Scanning lines 513 to 1024. The number of the first partial scan lines and the second partial scan lines may be the same.

The important point is that in steps S120 and S130, the first sub-time period includes a display time interval and a vertical blank time interval, and the second sub-time period also includes a display time interval and a vertical blank time interval. The display scanning operation of the first partial scan line occurs in the display time interval in the first sub-time period, and the display scanning operation of the second partial scan line occurs in the display time interval in the second sub-time period. In addition, in the vertical blank time interval in the first sub-time period and the second sub-time period, touch detection can be performed. That is to say, in this embodiment, in a single frame time period, there may be two vertical blank time intervals to perform two touch detection actions, effectively increasing the frequency of the touch detection actions.

In addition, since the touch detection action of this embodiment is performed in the vertical blank time interval, it will not cause the horizontal interference of the display screen, and no additional buffer is needed to temporarily store the display data of the display screen . That is to say, the embodiments of the present invention combine the advantages of the long vertical mode and the long horizontal mode of the conventional technology, and more effectively improve the performance of the touch display device.

Please refer to FIG. 2, which illustrates a waveform diagram of a touch and display scanning method according to an embodiment of the present invention. The frame time period FRP of this embodiment can be set according to the vertical synchronization signal VSYNC. Among them, in FIG. 2, the frame time period FRP can be set according to two adjacent pulse waves on the vertical synchronization signal VSYNC. It can be set as the starting point of the frame time period FRP after a fixed time after the rising edge (or falling edge) of the pulse wave P1 on the vertical sync signal VSYNC is detected, and the vertical sync signal is detected At a fixed time after the rising edge (or falling edge) of the pulse wave P2 on VSYNC, it can be set as the end point of the frame time period FRP.

In addition, the frame time period FRP can be divided into a first sub-time period SP1 and a second sub-time period SP2. The first sub-time period SP1 includes a display time interval DP1 and a vertical blank time interval VBP1, and the second sub-time period SP2 includes a display time interval DP2 and a vertical blank time interval VBP2. Corresponding to the first sub-time period SP1 and the second sub-time period SP2, the display scan line can be divided into a first partial scan line GIPO and a second partial scan line GIPE. The first sub-time period SP1 and the second sub-time period SP2 can be defined by the control signal DD_TSVD, and the display time interval DP1, the vertical blank time interval VBP1, the display time interval DP2 and the vertical blank time interval VBP2 can be based on the control signal DD_TSHD to define. The control signals DD_TSVD and DD_TSHD can be generated according to the vertical synchronization signal VSYNC through a timing controller in the touch display device.

In terms of action details, in the display time interval DP1 of the first sub-time period SP1, a display scan action for the first partial scan line GIPO may be performed. In addition, in the vertical blank time interval VBP1 after the display scanning operation of the first partial scan line GIPO is completed, the first touch detection operation TDA1 can be performed on the complete touch display panel. Then, in the display time interval DP2 of the second sub-time period SP2, a display scan operation for the second partial scan line GIPE can be performed. In addition, in the vertical blank time interval VBP2 after the display scanning operation of the second partial scan line GIPE is completed, the touch detection panel can perform a complete touch detection operation TDA2 again.

It can be known from the above description that in the embodiment of the present invention, the touch detection actions TDA1 and TDA2 can be performed twice in a single frame time period FRP, which effectively increases the frequency of touch detection.

In addition, in the embodiment of the present invention, since the display scanning operations are performed in the display time intervals DP1 and DP2, there is no need to provide an additional buffer to temporarily store the display data. Moreover, the touch detection actions TDA1 and TDA2 all occur in the vertical blank time intervals VBP1 and VBP2 where the screen display operation is not performed, so that the phenomenon of horizontal line interference on the display screen can be avoided.

For the setting of the first partial scan line and the second partial scan line, reference may be made to the schematic diagram showing the scanning operation of the embodiment of the present invention shown in FIG. 3. In the embodiment of the present invention, the first partial scan line and the second partial scan line can be set corresponding to the two parts of the display screen, respectively. In FIG. 3, the first partial scan lines are set to display the odd-numbered scan lines G1, G3 ... of the scan lines, and the second partial scan lines are set to display the even-numbered scan lines G2, G4 ... of the scan lines. In this way, in the first sub-time interval, the display scan operation performed by the first partial scan line can generate the frame 310. The display scan operation performed by the second partial scan line during the second sub-time interval can generate the frame 320. By integrating the picture 310 and the picture 320, a complete display picture 330 can be displayed in the entire frame time period.

Incidentally, in the embodiment of the present invention, the display scanning action may scan the first partial scan line and the second partial scan line in a specific order, or may target the first partial scan line and the second partial scan line in a non-specific order There are no specific restrictions for scanning.

Please refer to FIG. 4, which illustrates a waveform diagram of a touch and display scanning method according to another embodiment of the present invention. In this embodiment, the frame time period FRP is divided into three sub-time periods, namely a first sub-time period SP1, a second sub-time period SP2, and a third sub-time period SP3. The first sub-time interval SP1 includes the display time interval DP1 and the vertical blank time interval VBP1, the second sub-time interval SP2 includes the display time interval DP2 and the vertical blank time interval VBP2, and the third sub-time interval SP3 includes the display time interval DP3 and vertical Blank time interval VBP3.

Corresponding to the three sub-time intervals SP1 to SP3, the display scan lines are divided into a first partial scan line GIP1, a second partial scan line GIP2, and a third partial scan line GIP3. Among them, the first partial scan line GIP1, the second partial scan line GIP2, and the third partial scan line GIP3 are driven in the display time interval DP1, the display time interval DP2, and the display time interval DP3, respectively, to perform a display scanning operation. It is worth noting that in the vertical blank time interval VBP1 ~ VBP3, touch detection actions TDA1 ~ TDA3 are respectively executed.

From the above description, it is not difficult to find that by distinguishing the frame time period FRP into more sub-time periods SP1 ~ SP3, the number of times the touch detection actions TDA1 ~ TDA3 are executed can be increased and the execution of touch detection can be improved frequency.

Of course, in the embodiment of the present invention, distinguishing a single picture frame time period into three sub-time periods is just an illustrative example. Under the conditions allowed by the hardware device, the embodiment of the present invention can distinguish any single picture frame time period from Multiple sub-time periods to increase the frequency of touch detection.

Please refer to FIG. 5, which is a schematic diagram of a touch display device according to an embodiment of the invention. The touch display device 500 includes a touch display panel 510, a display scan driver 520, a touch detector 530, and a controller 540. The display scan driver 520 is coupled to the multiple display scan lines of the touch-control display panel 510. The touch detector 530 is coupled to the touch control display panel 510. The controller 540 is coupled to the display scan driver 520 and the touch detector 530. The controller 540 can be constructed by a timing controller in the touch display device, and is used to execute a plurality of steps as shown in FIG. 1 to increase the execution frequency of touch detection actions.

Regarding the hardware architecture, the touch display panel 510 can be any integrated (in cell or on cell) liquid crystal or light emitting diode display panel. The display scan driver 520 can be constructed using any gate driver and source driver known in the art by those skilled in the art. The touch detector 530 can also be constructed using any touch detection circuit well-known to those skilled in the art, and there is no fixed limit.

In addition, the controller 540 may be a processor with computing capabilities. Alternatively, the controller 540 may be designed through a hardware description language (Hardware Description Language, HDL) or any other design method of digital circuits well known to those skilled in the art, and through a field programmable logic gate array ( Field Programmable Gate Array (FPGA), complex programmable logic device (Complex Programmable Logic Device, CPLD) or hardware circuit implemented in the form of an application-specific integrated circuit (ASIC).

The operation details of the touch display device 500 have been described in detail in the foregoing embodiments, and will not be repeated here.

In summary, the present invention distinguishes the frame time period into multiple sub-time periods, and executes the touch detection action in the vertical blank time interval of the multiple sub-time periods, effectively without affecting the display screen. To increase the frequency of touch detection actions and the working efficiency of touch display devices.

Although the present invention has been disclosed as above with examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be subject to the scope defined in the appended patent application.

S110 ~ S130‧‧‧‧Touch and display scanning method steps

FRP‧‧‧frame time period

VSYNC‧‧‧Vertical synchronization signal

P1, P2‧‧‧ Pulse

SP1 ~ SP3‧‧‧sub-time period

VBP1 ~ VBP3 ‧‧‧ vertical blank time interval

DP1 ~ DP3‧‧‧Display time interval

GIPO, GIPE, GIP1 ~ GIP3 ‧‧‧ part scanning lines

DD_TSHD, DD_TSVD‧‧‧Control signal

TDA1 ~ TDA3‧‧‧Touch detection motion

G1, G3, G2, G4 ‧‧‧ scanning line

310, 320‧‧‧ picture

330‧‧‧Display screen

500‧‧‧Touch display device

510‧‧‧Touch display panel

520‧‧‧Display scan driver

530‧‧‧Touch detector

540‧‧‧Controller

FIG. 1 illustrates an operation flowchart of a touch and display scanning method according to an embodiment of the invention. FIG. 2 illustrates a waveform diagram of a touch and display scanning method according to an embodiment of the invention. FIG. 3 is a schematic diagram showing a scanning operation according to an embodiment of the invention. 4 is a waveform diagram of a touch and display scanning method according to another embodiment of the invention. 5 is a schematic diagram of a touch display device according to an embodiment of the invention.

Claims (14)

A touch and display scanning method, which is suitable for a touch display device, includes: distinguishing a picture frame time period into a first sub-time period and a second sub-time period; multiple displays in the first sub-time period A plurality of first partial scan lines in the scan lines perform a display scan action, and perform a touch detection action on the touch display device; and a plurality of first scan lines in the display scan lines in the second sub-time period The two partial scan lines perform a display scanning action, and perform the touch detection action on the touch display device. The touch and display scanning method as described in item 1 of the patent application scope, wherein a display scanning action is performed on the first partial scan lines of the display scan lines in the first sub-time period, and the touch The steps of the display device performing the touch detection action include: performing a display scan action on the first partial scan lines of the display scan lines in a display time interval in the first sub-time period; and The touch detection action is executed in a vertical blank time interval in the first sub-time period. The touch and display scanning method as described in item 1 of the patent application scope, wherein the display scanning action is performed on the second partial scan lines among the display scan lines in the second sub-time period, and The step of controlling the display device to perform the touch detection action includes: performing a display scan action on the second partial scan lines of the display scan lines in a display time interval in the second sub-time period; and The touch detection action is executed in a vertical blank time interval in the second sub-time period. The touch and display scanning method as described in item 1 of the patent application scope, wherein the number of the first partial scan lines and the second partial scan lines are the same. The touch and display scanning method as described in item 1 of the patent application scope, wherein the first partial scan lines are a plurality of odd scan lines among the display scan lines, and the second partial scan lines are the displays respectively Multiple even scan lines in the scan line. The touch and display scanning method as described in item 1 of the scope of the patent application further includes: determining the time period of the frame based on two consecutive vertical synchronization signals. The touch and display scanning method as described in item 1 of the patent application scope further includes: distinguishing the picture frame time period into the first sub-time period, the second sub-time period and a third sub-time period; and in The third sub-time period performs a display scan operation on the plurality of third partial scan lines among the display scan lines, and performs the touch detection action on the touch display device. A touch display device includes: a touch display panel; a display scan driver coupled to a plurality of display scan lines of the touch display panel; a touch detector coupled to the touch display panel; and a The controller, coupled to the display scan driver and the touch detector, is used to: distinguish a picture frame time period into a first sub-time period and a second sub-time period; during the first sub-time period, enable The display scan driver performs a display scan action on the plurality of first partial scan lines among the display scan lines, and causes the touch detector to perform a touch detection action; and during the second sub-time period, the The display scan driver performs a display scan action on the plurality of second partial scan lines among the display scan lines, and causes the touch detector to perform the touch detection action. The touch display device as described in item 8 of the patent application range, wherein the controller causes the display scan driver to respond to the display scan lines of the display scan lines during a display time interval in the first sub-time period A part of the scanning lines perform the display scanning operation, and the controller causes the touch detector to perform the touch detection operation in a vertical blank time interval in the first sub-time period. The touch display device as described in item 8 of the patent application range, wherein the controller causes the display scan driver to respond to the first of the display scan lines in a display time interval in the second sub-time period The two partial scan lines perform the display scanning action, and the controller causes the touch detector to perform the touch detection action in a vertical blank time interval in the second sub-time period. The touch display device according to item 8 of the patent application scope, wherein the number of the first partial scan lines and the second partial scan lines are the same. The touch display device according to item 8 of the patent application scope, wherein the first partial scan lines are a plurality of odd scan lines among the display scan lines, and the second partial scan lines are the display scan lines, respectively Multiple even scan lines. The touch display device as described in item 8 of the patent application range, wherein the controller determines the frame time period according to two consecutive vertical synchronization signals. The touch display device as described in item 8 of the patent application range, wherein the controller is further used to: distinguish the picture frame time period into the first sub-time period, the second sub-time period and a third sub-time period ; During the third sub-time period, the display scan driver performs a display scan operation on the plurality of third partial scan lines among the display scan lines, and causes the touch detector to perform the touch detection action