TOUCH DISPLAY DEVICE AND CONTROL METHOD THEREOF

A touch display device and a control method thereof are provided. The control method includes: setting a display scan sequence and a touch detection scan sequence; performing a display scan operation according to the display scan sequence based on a first frequency according to a control signal; and performing a touch scan operation according to the touch detection scan sequence based on a second frequency according to the control signal. At a same time point, a scanned display area corresponding to the display scan operation and a scanned touch area corresponding to the touch scan operation are non-overlapped.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority benefit of Taiwanese application no. 110139662, filed on Oct. 26, 2021. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.

BACKGROUND

Technical Field

The disclosure relates to a touch display device and a control method thereof, and particularly relates to a touch display device and a control method thereof that can reduce interference.

Description of Related Art

The distance between touch control and display panel is getting closer with the change of the market's demand for lighter, thinner, and smaller products as the size of glass becomes thinner. Especially for embedded products, the interference caused by display operations to touch detection operations becomes more obvious.

In the conventional technical field, a single-frequency hopping scan method or a multi-frequency scan method is adopted to reduce the interference between touch detection operation and display scan operation. These methods often require a relatively complex architecture. In the conventional technical field, touch detection and display scan methods may also be performed through time division. With the increasing demand for large panel size, it is also difficult to implement time division arrangement.

SUMMARY

The disclosure provides a variety of touch display devices and control methods thereof, which can reduce possible interference generated between touch scan operations and display scan operations.

The control method of the disclosure includes: setting a display scan sequence and a touch detection scan sequence; performing a display scan operation according to the display scan sequence based on a first frequency according to a control signal; and, performing a touch scan operation according to the touch detection scan sequence based on the second frequency according to the control signal. At a same time point, a scanned display area corresponding to the display scan operation and a scanned touch area corresponding to the touch scan operation are non-overlapped.

A touch display device of the disclosure includes a touch display panel and a controller. The controller is coupled to the touch control display panel to: set the display scan sequence and the touch detection scan sequence; perform the display scan operation according to the display scan sequence based on the first frequency according to the control signal; perform the touch scan operation according to the touch detection scan sequence based on the second frequency according to the control signal. At a same time point, a scanned display area corresponding to the display scan operation and a scanned touch area corresponding to the touch scan operation are non-overlapped.

Another touch display device of the disclosure includes a touch display panel and a controller. The controller is coupled to the touch control display panel for: receiving the display scan sequence to set the touch detection scan sequence; performing the display scan operation according to the display scan sequence based on the first frequency according to the control signal; and, performing the touch scan operation according to the touch detection scan sequence based on the second frequency according to the control signal. At a same time point, a scanned display area corresponding to the display scan operation and a scanned touch area corresponding to the touch scan operation are non-overlapped.

Based on the above, the disclosure performs the display scan operation according to the display scan sequence based on the first frequency according to the display scan sequence and the touch detection scan sequence, and performs the touch scan operation according to the touch detection scan sequence based on the second frequency. In the embodiment of the disclosure, at a same time point, by making a scanned display area corresponding to the display scan operation and a scanned touch area corresponding to the touch scan operation not to overlap each other, it is possible to effectively reduce the possibility of interference generated between the display scan operation and the touch scan operation, and the performance of the touch display device can be improved.

DESCRIPTION OF THE EMBODIMENTS

Please refer toFIG.1.FIG.1is a flowchart of a control method of a touch display device according to an embodiment of the disclosure. In step S110, a display scan sequence and a touch detection scan sequence are set. Then, in steps S120and S130, a display scan operation is performed according to the display scan sequence based on a first frequency according to a control signal, and a touch scan operation is performed according to the touch detection scan sequence based on a second frequency. In the embodiment of the disclosure, at a same time point, the scanned display area corresponding to the display scan operation and the scanned touch area corresponding to the touch scan operation are non-overlapped. Moreover, the first frequency and second frequency may be the same or different.

Please refer toFIG.2andFIG.3Afor details of operation.FIG.2is a schematic view showing a scan operation of the touch display device according to an embodiment of the disclosure, andFIG.3Ais a schematic view showing a waveform of a scan operation of the touch display device according to an embodiment of the disclosure. InFIG.2, the touch display panel210in the touch display device can be divided into a plurality of display rows L0˜LN and divided into a plurality of touch areas. The plurality of touch areas in this embodiment are respectively overlapped with the plurality of display rows L0˜LN.

Corresponding to step S110inFIG.1, the touch display device can start the touch scan and display scan operations according to the control signal TE. In an embodiment, the control signal TE may be a vertical synchronization signal, and the length of time between two positive pulses of the control signal TE may be a frame period.

The touch display device can set the start time of the touch scan operation and the start time of the display scan operation according to the positive pulses of the control signal TE. For example, inFIG.3A, the touch display device can set the display start time t1according to the positive pulse of the control signal TE, and start the display scan operation according to the display start time t1corresponding to step S120. The touch display device can set the touch start time point t2according to the positive pulse of the control signal TE, and start the touch scan operation according to the touch start time point t2corresponding to step S130.

In the embodiment ofFIG.2, the display scan direction DS can be set to scan sequentially from the upper display row L0to the lower display row LN. InFIG.3A, when the rising edge of the control signal TE is detected, the touch scan operation is started first at the touch start time point t2, and the scanned touch area TCH is the touch area corresponding to the display rows LB+1˜LC. Then, following a delay time after the falling edge of the control signal TE is detected, the display start time point t1is set. The touch display device starts the display scan operation according to the display start time point t1, and makes the scanned display rows DSP as display rows L0˜LA in sequence. It should be noted that in other embodiments of the disclosure, the display scan direction can also be scanning from the lower display row to the upper display row. In fact, all display row scan methods commonly used by those skilled in the art can be applied to the disclosure, there is no limitation set to the disclosure.

At time point t21, the scanned touch area TCH is changed to the touch area corresponding to the display rows LC+1˜LN. At the subsequent time point t11, the scanned display row DSP becomes the display rows LA+1˜LB in sequence. Then, at time point t22, the scanned touch area TCH is changed to the touch area corresponding to the display rows L0˜LA. At the subsequent time point t12, the scanned display row DSP becomes the display rows LB+1˜LC in sequence. Then, at time point t23, the scanned touch area TCH is changed to the touch area corresponding to the display rows LA+1˜LB. At the subsequent time point t13, the scanned display row DSP becomes the display rows LC+1˜LN in sequence.

Based on the above description, it can be found that at any time point, the display row and the touch area that are scanned simultaneously are non-overlapped. In this way, the display scan operation and touch scan operation can be effectively separated in position, thereby reducing the possibility of interference generated between each other.

It should be noted that the touch detection scan sequence and display scan sequence can be preset. The touch display device can start the display scan operation according to the display start time point t1according to the preset touch detection scan sequence and the display scan sequence, and start the touch scan operation according to the touch start time point t2.

In addition, in the embodiment of the disclosure, the touch display device may have one or more sets of touch detection scan sequence and display scan sequence. The touch display device can select one of multiple display scan sequences to perform the display scan operation according to the requirements of the display effect, and select the corresponding touch detection scan sequence to perform the touch scan operation. The focus lies in that, at any time point, the display row and the touch area that are scanned simultaneously are non-overlapped, so that the interference between each other can be effectively reduced, and the quality of the touch display is improved.

In the embodiment ofFIG.3A, the touch display panel210can be divided into four equal parts, the display row LA can be the N/4th display row; the display row LB can be the N/2th display row; and the display row LC can be the 3N/4th display row.

Incidentally, the touch display device of the embodiment of the disclosure performs the display scan operation according to a first frequency, and performs the touch scan operation according to a second frequency, and the first frequency may be equal to the second frequency. In the embodiment of the disclosure, the second frequency may be, for example, twice the first frequency, but is not limited thereto. The relationship between the second frequency and the first frequency, for example, can be set according to the relationship between the display row and the number of touch areas, and there is no fixed limitation. For example, in other embodiments of the disclosure, the second frequency may also be greater than the first frequency or less than the first frequency.

In addition, refer toFIG.3B,FIG.3Bis a schematic view showing a waveform of another scan operation of the touch display device according to an embodiment of the disclosure. In each frame period, the scanned display row DSP is display rows L0˜LA, LA+1˜LB, LB+1˜LC, LC+1˜LD, LD+1˜LE, and LE+1˜LN in sequence. In addition, in the first frame period, the scanned touch area TCH is the touch area corresponding to the display rows LB˜LC, LD˜LE, and L0˜LA in sequence. In the second frame period, the scanned touch area TCH is the touch area corresponding to the display rows LC˜LD, LE˜LN, and LA˜LB in sequence. That is, in this embodiment, the touch area can be divided into six blocks, and the scan operation is completed once in multiple (for example, 2) frame periods. In this embodiment, the display row LA can be the N/6th display row; the display row LB can be the N/3th display row; the display row LC can be the N/2th display row; the display row LD can be the 2N/3th display row; and the display row LC can be the 5N/6th display row.

In the embodiment of the disclosure, the second frequency may be less than the first frequency.

Please refer toFIG.4AandFIG.4B.FIG.4AandFIG.4Bare schematic views of a layout of a display row and a touch area according to another embodiment of the disclosure. InFIG.4A, the touch display panel410may have display rows L0˜LN arranged in sequence. InFIG.4B, the touch display panel410may have touch areas T1˜T12arranged in an array. For details of performing display and touch scan operation, reference may be made toFIG.5, which illustrates a schematic view of the waveform of scan operation of the touch display device in the embodiments ofFIG.4AandFIG.4Bof the disclosure. According to the control signal TE, the touch display device can set the display start time point t1and the touch start time point t2. The touch display device starts the display scan operation at the display start time point t1, so as to perform the display scan operation for the display rows L0˜LA in sequence between the display start time point t1and the time point t11. Meanwhile, the touch display device can start the touch scan operation at the touch start time point t2to perform the touch scan operation for the touch areas T7˜T9in sequence between the touch start time point t2and the time point t21.

Then, the touch display device performs the display scan operation for the display rows LA+1˜LB in sequence between time points t11and t12, and performs the touch scan operation for touch areas T10˜T12in sequence between time points t21and t22.

The touch display device performs the display scan operation for display rows LB+1˜LC in sequence between time points t12˜t13, and performs the touch scan operation for touch areas T1˜T3in sequence between time points t22˜t23. The touch display device performs the display scan operation for display rows LC+1˜LN in sequence between time points t13and t14, and performs the touch scan operation for touch areas T4˜T6in sequence between time points t23and t24.

According to the illustration inFIG.5, it can be obtained that during the operation of the touch display device, at any time point, the scanned display row and the touch area do not overlap with each other at all. In this manner, it is possible to effectively reduce the interference that may occur between the scanned display row and the touch area, and maintain the accuracy of touch detection and the quality of the display.

It should be noted that since the frequency of the touch scan operation performed by the touch display device is equal to the frequency of the display scan operation, each display row can be scanned once in a single frame period, and each touch control area may be scanned once or multiple times.

Please refer toFIG.6.FIG.6is a schematic view showing a relationship between the scanned display row and the scanned touch area set by the touch display device in an embodiment of the disclosure. InFIG.6, at a same time point, the touch display device of the embodiment of the disclosure can make the shortest distance dl between the scanned display row DSP and the scanned touch area TCH on the touch display panel610to be greater than the preset threshold. Through this setting, the mutual interference between the scanned display row DSP and the scanned touch area TCH can be further reduced, and the quality of touch detection and display can be maintained.

The threshold can be set according to the size of the touch display panel610, the size of each display row and each touch area, and the relationship between the operating frequencies of the touch scan operation and the display scan operation.

Please refer toFIG.7AtoFIG.7D.FIG.7AtoFIG.7Drespectively show schematic views of implementations of various touch areas in a touch display device according to an embodiment of the disclosure. InFIG.7A, each touch area TCH can be rectangular and arranged in an array. InFIG.7B, based on the arc shape of the touch display panel, the touch area TCHC in the center region may be rectangular, and the touch area TCHP in the surrounding region may be fan-shaped. InFIG.7C, each touch area TCH can be a triangle. InFIG.7D, the touch area TCHC located in the middle part can all be diamond-shaped, and the touch area TCHP located in the peripheral part can be triangular.

The illustrations inFIG.7AtoFIG.7Dare only examples for description. Those with ordinary knowledge in the art can recombine and modify the examples according to the illustrations inFIG.7AtoFIG.7Dto set the touch area, the disclosure provides no limitation thereto.

Please refer toFIG.8.FIG.8is a schematic view of a touch display device according to an embodiment of the disclosure. The touch display device800includes a controller810and a touch display panel820. The touch display panel820may have multiple display rows and multiple touch areas. The controller810is adapted to perform a plurality of steps S110to S130of the control method as shown inFIG.1.

The implementation details of the multiple steps S110to S130of the control method shown inFIG.1have been described in detail in the foregoing multiple embodiments and implementations, and will not be repeated here.

In this embodiment, the controller810can be implemented as a timing controller that is familiar to those with ordinary knowledge in the field of touch display.

Regarding the implementation details of the controller810, reference may be made to the schematic view of the implementation of the controller according to the embodiment of the disclosure shown inFIG.9. The controller810includes a control signal detector811, a processor812, a sequencing circuit813, a scan signal generator814, and a memory815. In an embodiment of the disclosure, the control signal detector811is adapted to receive the control signal TE, and to set the display start time point of the display scan operation and set the touch start time point of the touch scan operation according to the control signal TE. The processor812is adapted to set the display scan sequence and the touch detection scan sequence.

In another embodiment of the disclosure, the display start time point and the display scan sequence of the display scan operation can be set by another controller other than the controller810. The control signal detector811receives the control signal TE, and sets the touch start time point of the touch scan operation according to the control signal TE and the display scan sequence. The processor812is adapted to receive the display scan sequence provided by another controller, and performs the setting operation on the touch detection scan sequence.

The sequencing circuit813can generate the display scan control signal and the touch scan control signal according to the display scan sequence and the touch detection scan sequence based on the display start time point and the touch start time point. The scan signal generator814can respectively generate a plurality of display scan signals and a plurality of touch scan signals according to the display scan control signal and the touch scan control signal.

In addition, the memory815can be adapted to store one or more candidate display scan sequences and one or more candidate touch detection scan sequences. Multiple candidate display scan sequences may respectively correspond to multiple candidate touch detection scan sequences to form multiple scan sequence groups. The processor812can select one of the multiple scan sequence groups, and set the display scan sequence and the touch detection scan sequence accordingly.

In this embodiment, the control signal detector811, the processor812, the sequencing circuit813, and the scan signal generator814may all be constructed by digital circuits. The control signal detector811, the processor812, the sequencing circuit813, and the scan signal generator814can be generated by using digital circuit design methods commonly known in the art, such as through Karnaugh map, truth table, or through hardware description language and circuit synthesis software, the disclosure provides no limitation thereto.

In summary, the touch display device of the disclosure makes the scanned display row and the touch area not to overlap each other at a same time point in the display scan operation and touch scan operation based on the set display scan sequence and touch detection scan sequence. In this manner, it is possible to reduce the interference that may occur between the display row and touch area, thereby maintaining the quality of display and touch detection.