TW201447660A - Touch display apparatus and driving and sensing method thereof - Google Patents

Abstract

A touch display apparatus includes a touch electrode layer, a display panel and a driving-sensing circuit. The touch electrode layer has a plurality of driving lines and a plurality of sensing lines. The display panel has a plurality of frame times. The driving-sensing circuit is electrically connected with the touch electrode layer. The driving-sensing circuit drives the driving lines and receives a plurality of sensing signals from the sensing lines. The driving-sensing circuit has a full time driving-sensing mode and a partial driving-sensing mode. The driving-sensing circuit operates the full time driving-sensing mode at the n<SP>th</SP> frame time of the display panel. The driving-sensing circuit operates in the partial driving-sensing mode at the (n+1)<SP>th</SP> frame time of the display panel, where n is an positive integer.

Description

Touch display device and driving sensing method thereof

The invention relates to a touch display device and a driving sensing method thereof.

With the advancement of technology, touch technology has been widely used in a variety of electronic products. For the touch display device, since the user can perform various functions by touching the display screen of the touch display device, the user's operation complexity can be simplified, and the consumer is more and more popular. .

In the conventional touch display device, the driving sensing manners of the touch electrodes can be roughly divided into two types, one is a full time driving and sensing mode and the neutral time driving sensing mode ( Blanking time driving and sensing mode). The full-time drive sensing can also be referred to as fast asynchronous drive sensing, which refers to the touch signal being sent by the touch chip and receiving the sensing signal; and the neutral time driving sensing refers to the driving signal sent by the touch wafer. The received sensing signal time will fall on the display panel's neutral time.

Referring to FIG. 1A, it is a schematic diagram showing full-time drive sensing. Since the full-time drive sensing continuously drives the sensing, it has a high signal return rate, but in order to avoid the interference of the display data signals in the display panel, the full-time driving sensing needs to be performed with a higher voltage. Driven, so it consumes more power. In addition, when the first scan line of the display panel is turned on (as indicated by the dashed line a), the noise caused by it will affect the accuracy of the full-time drive sensing, so the corresponding received drive sensing signal is displayed at this time. Noise interference is not easy to judge the touch signal (as shown in the slash area). Moreover, when the display panel displays a special pattern, for example, a black and white interlaced array pattern, noise is also generated, so that all the corresponding driving sensing signals are also incorrect, which may easily cause the touch display device to malfunction.

In addition, please refer to FIG. 1B, which shows a schematic diagram of performing neutral time drive sensing. Drive sensing at neutral time b is less likely to be interfered with by the display data signal, although However, the rate of return is low, but the ability to resist noise is better. However, as the resolution of the display panel increases, the neutral time is also shortened and the time during which the touch wafer is driven for sensing is compressed. If the drive sensing cannot be completed in the neutral time (as indicated by the dotted line), the touch display device may malfunction.

Therefore, how to provide a touch display device and a driving sensing method thereof can simultaneously have the advantages of full-time driving sensing and neutral time driving sensing, thereby overcoming the challenge of insufficient noise and neutral time, and has become an important One of the topics.

In view of the above problems, an object of the present invention is to provide a touch display device and a drive that can simultaneously meet the advantages of full-time drive sensing and neutral time drive sensing, thereby overcoming the challenges of insufficient noise and neutral time. Sensing method.

To achieve the above objective, a touch display device according to the present invention includes a touch electrode layer, a display panel, and a driving sensing circuit. The touch electrode layer has a plurality of driving lines and a plurality of sensing lines. The display panel has a complex frame time. The driving sensing circuit is electrically connected to the touch electrode layer, and the driving sensing circuit drives the driving lines and receives the plurality of sensing signals from the sensing lines, and the driving sensing circuit has a full-time driving sensing mode and a part of the driving Sensing mode. During the nth frame time of the display panel, the driving sensing circuit operates in the full-time driving sensing mode, and the driving sensing circuit operates in the partial driving sensing mode at the n+1th frame time of the display panel, n Defined as a positive integer.

According to the driving sensing method of the touch display device of the present invention, the touch display device has a touch electrode layer, a display panel, a driving sensing circuit and a noise detecting circuit, and the touch The electrode layer has a plurality of driving lines and a plurality of sensing lines, and the display panel has a plurality of frame times. The driving sensing circuit is electrically connected to the touch electrode layer, and the noise detecting circuit is electrically connected to the driving sensing circuit. The driving sensing method comprises: driving the driving lines by the driving sensing circuit, and receiving the senses from the driving a plurality of sensing signals of the line; and the noise sensing circuit controls the driving circuit according to the sensing signals, wherein the driving sensing circuit operates at a full-time driving sense at the nth frame time of the display panel In the measurement mode, at the n+1th frame time of the display panel, the driving sensing circuit operates in a part of the driving sensing mode, and n is defined as a positive integer.

In one embodiment, the system is applied to a mutual inductive capacitive touch panel architecture or a self-inductive capacitive touch panel architecture.

In one embodiment, the touch display device further includes a noise detecting circuit electrically connected to the driving sensing circuit, and the noise detecting circuit controls the driving sensing circuit according to the sensing signals.

In an embodiment, the partial drive sensing mode operates at one of the display panels.

In one embodiment, when the sum of the signals of the sensing signals is greater than a threshold, the driving sensing circuit is switched from the full-time driving sensing mode to the partial driving sensing mode.

In one embodiment, when the sum of the signal difference values of the two adjacent sensing signals is greater than a threshold, the driving sensing circuit is switched from the full-time driving sensing mode to the partial driving sensing mode.

In one embodiment, each of the sensing signals is respectively compared with a threshold. When the number of sensing signals greater than the threshold is greater than a predetermined value, the driving sensing circuit is switched from the full-time driving sensing mode to the partial driving sense. Measurement mode.

In an embodiment, when the sensing mode is partially driven, the driving sensing circuit drives the driving lines of the portion in a neutral time and receives the sensing signals from a portion of the sensing lines of the portion, and The other portion of the drive lines are driven in another neutral time and receive the sensed signals from another portion of the sense lines of the other portion.

According to the above, in a touch display device and a driving sensing method thereof according to the present invention, when the driving sensing mode of the adjacent frame time of the display panel is used, the driving sensing circuit is controlled according to the sensing signals. Switching in a full-time drive sensing mode and a portion of the drive sensing mode. Wherein, when the noise interference is large, the driving sensing circuit can switch to the partial driving sensing mode, thereby avoiding the interference of the noise and overcoming the problem of insufficient neutral time. In addition, when the noise interference is small, the driving sensing circuit can be switched to the full-time driving sensing mode to obtain a higher signal return rate and improve the reliability of the touch sensing. Therefore, the touch display device and the driving sensing method thereof of the present invention can simultaneously have the advantages of full-time driving sensing and neutral time driving sensing, thereby overcoming the challenge of insufficient noise and neutral time.

1‧‧‧Touch display device

11‧‧‧Touch electrode layer

12‧‧‧ display panel

13‧‧‧Drive sensing circuit

14‧‧‧ Noise Detection Circuit

15‧‧‧Signal Processing Circuit

16‧‧‧System Circuit

A‧‧‧dotted line

B‧‧‧empty time

AMP‧‧‧Operational Amplifier

C1‧‧‧ capacitor

D‧‧‧ counter

D1~D16‧‧‧Signal difference

G‧‧‧NOR logic gate

S01~S03‧‧‧Steps

S1‧‧‧ first signal

S2‧‧‧ second signal

Sc1~ScN‧‧‧ sensing signal

T1‧‧‧ shows time

T2‧‧‧V-Neutral time

T3‧‧‧ frame time

T4‧‧‧H-Neutral time

Th‧‧‧ threshold

Tx‧‧‧ drive signal

R1, R2‧‧‧ resistance

V1‧‧‧Variable voltage

Figure 1A is a schematic diagram showing full-time drive sensing.

Figure 1B is a schematic diagram showing the implementation of neutral time drive sensing.

2 is a functional block diagram of a touch display device according to a preferred embodiment of the present invention.

FIG. 3A is a waveform diagram of a frame signal of one of the display panels of FIG. 2. FIG.

FIG. 3B is a waveform diagram of two adjacent data scanning signals of the display panel of FIG. 2. FIG.

FIG. 4 is a schematic diagram of driving sensing mode switching.

5A and 5B are schematic diagrams showing the first method of detecting noise.

6A and 6B are schematic diagrams showing a second method of detecting noise.

7A and 7B are schematic diagrams showing a third type of noise detection.

FIG. 8 is a schematic circuit diagram of a noise detecting circuit of the present invention.

FIG. 9 is a schematic flow chart of a driving sensing method of a touch display device according to a preferred embodiment of the present invention.

FIG. 10 is another schematic flowchart of a driving sensing method of a touch display device according to a preferred embodiment of the present invention.

Hereinafter, a touch display device and a driving sensing method thereof according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings, wherein the same elements will be described with the same reference numerals.

Please refer to FIG. 2 , which is a functional block diagram of a touch display device 1 according to a preferred embodiment of the present invention. The touch display device 1 can be, for example but not limited to, a tablet computer, a smart phone, a global positioning system, or an electronic device with a touch screen. In addition, the touch display device 1 can be applied to a self-inductive capacitive touch panel structure or a mutual inductance capacitive touch panel architecture, which is not limited.

The touch display device 1 includes a touch electrode layer 11 , a display panel 12 , a driving sensing circuit 13 , and a noise detecting circuit 14 . In addition, the touch display device 1 further includes a signal processing circuit 15 and a system circuit 16.

The touch electrode layer 11 has a plurality of driving lines and a plurality of sensing lines (not shown).

The display panel 12 can be, for example but not limited to, a liquid crystal display panel, or The machine emits a display panel. Here, a liquid crystal display panel is taken as an example. The touch electrode layer 11 can be disposed on one of the color filter substrates of the liquid crystal display panel and located on the color filter substrate, or between the color filter substrate and the thin crystal transistor substrate of the liquid crystal display panel. The control display device becomes a TOD (touch on display) touch device. However, in other implementations, the touch electrode layer 11 can also be disposed outside the liquid crystal display panel and on the other substrate, so that the touch display device 1 has a single-chip glass touch panel (One Glass Solution, OGS) touch device. In addition, the display panel 12 has a plurality of frame times.

The driving sensing circuit 13 is electrically connected to the touch electrode layer 11 , wherein the driving sensing circuit 13 drives the plurality of driving lines of the touch electrode layer 11 and receives the plurality of sensing signals Sc1 to ScN from the sensing lines. N is defined as a positive integer. The driving and sensing circuit 13 can include a driving circuit and a sensing circuit. The driving circuit is responsible for driving the driving lines, and the sensing circuit is responsible for receiving the sensing signals Sc1~ScN (touch sensing signals). . The driving sensing circuit 13 can operate in a driving and sensing all the time mode or a partial driving and sensing mode. Here, the driving of the complex driving line and the receiving of the complex sensing signal in the full-time driving sensing mode are operated in the frame time of the display panel 12, wherein the driving of the plurality of driving lines and the receiving of the plurality of sensing signals are performed in the frame time. It is not limited to how to distribute, and it can be evenly distributed over time intervals, or it can be concentrated in a certain period of time, as long as it belongs to the frame time. In addition, the number of times the multi-drive line is driven and the number of complex sense signals is received is not limited. If time permits, the more times the multi-drive line is driven and the number of times the complex sense signal is received is better for touch sensitivity. And driving the plurality of driving lines and receiving the complex sensing signals in a part of the driving sensing mode to operate on one of the blanking time of the display panel 12, wherein driving the plurality of driving lines and receiving the complex sensing signals can be different in different spaces. Completed in the file time. The display time plus the neutral time is collectively referred to as one frame time of the display panel 12. The display time is the time when the display panel 12 can display the image screen (transmitting the data signal), and the neutral time is the time when the image screen is not displayed (the data signal is not transmitted). Further, the neutral time can be divided into a V-blanking time and an H-blanking time.

Hereinafter, please refer to FIG. 3A and FIG. 3B, respectively, to explain the V-neutral time and the H-neutral time. 3A is a waveform diagram of a frame signal of one of the display panels 12, and FIG. 3B is a waveform diagram of two adjacent data scanning signals of the display panel 12.

As shown in FIG. 3A, T3 represents a frame time, and T1 represents a display time. During the display time T1, the scan lines are sequentially turned from the first strip to the last strip to transmit the data signals to the pixel electrodes of the pixels of the display panel 12 by the data lines, respectively. In addition, T2 is a V-neutral time (T1+T2=T3), and the V-neutral time is the time when the data signal is not transmitted, and when the display panel 12 displays the image picture, the plurality of scan lines are not turned on. time.

In addition, as shown in FIG. 3B, the H-neutral time refers to the time difference (T4 of FIG. 3 is the H-neutral time) before the end of the Nth scanning signal is transmitted after the end of the Nth scanning signal. Therefore, the partial drive sensing mode of the present invention can operate on the V-Neutral time and the H-Neutral time of the display panel 12, and is not particularly limited.

Referring to FIG. 2 again, and referring to FIG. 4 at the same time, the noise detecting circuit 14 is electrically connected to the driving sensing circuit 13. The noise detecting circuit 14 receives and controls the actuation of the driving sensing circuit 13 according to the sensing signals Sc1 to ScN. In the driving sensing mode of the adjacent frame time of the display panel 12, the noise detecting circuit 14 controls the driving sensing circuit 13 to drive the sensing mode and the partial driving according to the sensing signals Sc1 to ScN. Switching in the sensing mode. In other words, as shown in FIG. 4, the noise detecting circuit 14 can control the operation mode of the driving sensing circuit 13 according to the signal condition of the sensing signals Sc1 to ScN (for example, the influence of noise), for example, when the noise detecting circuit When it is determined that the sensing signals Sc1 to ScN are too much affected by the noise, the driving sensing circuit 13 is switched from the full-time driving sensing mode to the partial driving sensing mode. On the contrary, when the noise detecting circuit 14 determines that the influence of the noise in the sensing signals Sc1 to ScN is small, the driving sensing circuit 13 can be switched from the partial driving sensing mode to the full-time driving sensing mode to make the touch The display device 1 has the advantages of both full-time drive sensing and neutral time drive sensing, thereby overcoming the challenge of insufficient noise and neutral time.

The following three methods of noise detection are used to further explain how the noise detecting circuit 14 determines the signal status of the sensing signals Sc1 to ScN. It is to be noted that the following are merely examples and are not intended to limit the invention. In addition, in the following three kinds of noise detection, the driving sensing circuit 13 takes the operation of the full-time driving sensing mode as an example to obtain a higher signal return rate, but when the noise detecting circuit detects high noise The signal is switched to the partial drive sensing mode during the neutral time.

The first type of noise detection is as follows: Referring to FIG. 5A and FIG. 5B, the noise detection circuit 14 is based on the sum of the signals of the sensing signals Sc1 to ScN, for example, the sensing signal Sc1. The sum of the voltage values of ~ScN is used to judge the signal status. Wherein, when the sum of the signals of all the sensing signals Sc1~ScN is greater than a threshold, it indicates that the touch electrode layer 11 is interfered, and the noise detecting circuit 14 can control the driving of the sensing circuit 13 in the next frame time. At the neutral time, the full-time drive sensing mode is switched to the partial drive sensing mode.

As shown in FIG. 5A, each number is a sensing signal, the sum of the sensing signals is 459, and the threshold is 800. Since the sum of the sensing signals is less than the threshold, the noise detecting circuit 14 determines the figure. During the frame time, the sensing signal is less interfered by the noise, and the driving sensing mode is not switched.

In addition, as shown in FIG. 5B, the sum of the sensing signals is 1588, and the threshold is 800. For example, since the sum of the sensing signals is greater than the threshold, the noise detecting circuit 14 determines the sensing time in the frame time. The interference from the noise is large, so the drive sensing circuit 13 is switched from the full-time drive sensing mode to the partial drive sensing mode at the neutral time of the next frame time.

In other words, when the sum of the signals of the sensing signals Sc1 to ScN is greater than the threshold, the noise detecting circuit 14 determines that the sensing signals Sc1 to ScN are affected by the noise and cause an abnormality. The source of the noise is, for example, a change in the voltage level from the external signal interference or the special display data signal. At this time, the sensing signals Sc1~ScN may not be the normal touch signals, and the noise detecting circuit 14 is When the next frame time is in the neutral time, the driving sensing mode of the driving sensing circuit 13 is switched to switch from the full-time driving sensing mode to the partial driving sensing mode, so that the display time is later. The signal will not interfere with the sensing signals Sc1~ScN, thus avoiding the influence of noise.

In addition, the second type of noise detection is as follows: Referring to FIG. 6A and FIG. 6B, the noise detection circuit 14 is based on the sum of the signal difference values of the two adjacent sensing signals Sc1 to ScN, for example, The sum of the difference between the voltage values of the two adjacent sensing signals Sc1~ScN determines whether the sensing signals Sc1~ScN are disturbed by the noise. Wherein, when the sum of the signal differences of the two adjacent sensing signals Sc1~ScN is greater than a threshold, the noise detecting circuit 14 controls the driving of the sensing circuit 13 to the full time in the next frame time. The drive sensing mode is switched to the partial drive sensing mode. The difference between the two adjacent sensing signals refers to the voltage difference of the sensing signals generated by the touch electrodes of the two adjacent touch electrode layers 11, such as the voltages of the sensing signals Sc1 and the sensing signals Sc2. Difference, the voltage difference between the sensing signal Sc2 and the sensing signal Sc3, and so on, mathematically The difference between the signals indicating the two adjacent sensing signals is, for example, Sc2-Sc1, Sc3-Sc2, ..., ScN-Sc(N-1), and the like. When the sum of all the signal differences between the sensing signals Sc1 and ScN is greater than the threshold, the noise detecting circuit 14 determines that the sensing signals Sc1 to ScN are affected by the noise and cause an abnormality, so the driving sensing can be performed. The drive sensing mode of circuit 13 is switched to avoid the effects of noise. The difference between the two adjacent pairs described above is merely exemplary and not limiting, and any difference may be included in the scope of the embodiment as long as the judgment accuracy can be increased.

As shown in FIG. 6A, the signal difference of the sensing signal is Sc2-Sc1=0, Sc3-Sc2=0, Sc3-Sc2=D1, ..., Sc12-Sc11=D6, and the sum of the signal differences is 0+0+ D1+...+D6, if the sum is less than the threshold, the noise detecting circuit 14 determines that the sensing signal is less interfered by the noise, and does not switch the driving sensing mode of the driving sensing circuit 13. In addition, as shown in FIG. 6B, the signal difference of the sensing signal is Sc2-Sc1=D7, Sc3-Sc2=D8, Sc3-Sc2=D9, . . . , and Sc12-Sc11=D16, and the sum of the signal difference is D7+. D8+D9+...+D16, if the sum is greater than the threshold, the noise detecting circuit 14 determines that the sensing signal is greatly interfered by the noise during the frame time, so the blank time in the next frame time The drive sensing circuit 13 is switched from the full-time drive sensing mode to the partial drive sensing mode.

In addition, the third type of noise detection is as follows: Referring to FIG. 7A and FIG. 7B, the noise detection circuit 14 is based on the respective sensing signals Sc1 to ScN, for example, the voltage values of the respective sensing signals Sc1 to ScN. Determine the status of the signal. The noise detection circuit 14 compares each of the sensing signals Sc1 to ScN with a threshold value, for example, when the signal voltage value of each of the sensing signals Sc1 to ScN is greater than a threshold value greater than a preset value, the noise is detected. The detecting circuit 14 controls the driving of the sensing circuit 13 to switch from the full-time driving sensing mode to the partial driving sensing mode when the next frame time is in the neutral time.

As shown in FIG. 7A, wherein the sensing signal Sc5 and the sensing signal Sc12 are greater than the threshold (Th), and thus the number of sensing signals greater than the threshold is 2, if the preset value is 2, for example, greater than the threshold The number of sensing signals is not greater than the preset value, so the noise detecting circuit 14 determines that the sensing signal is less interfered by the noise during the frame time, and does not switch the driving sensing of the driving sensing circuit 13. mode.

In addition, as shown in FIG. 7B, wherein the sensing signals greater than the threshold are Sc1, Sc2, Sc5, Sc9, and Sc12, and the number is greater than the preset value, the noise detecting circuit 14 determines the frame. During the time, the sensing signal is greatly interfered by the noise, so the driving sensing circuit 13 is switched from the full-time driving sensing mode to the partial driving sensing mode in the neutral time of the next frame time. In other words, the noise detecting circuit 14 calculates the number of sensing signals that are abnormal in the sensing signals Sc1 to ScN. When the number is too large, the driving sensing mode of the driving sensing circuit 13 is switched to avoid the noise. Impact.

The driving and sensing circuit 13 can perform the operations of transmitting the driving signal and receiving the sensing signal (and the signal processing processing) in the display time and the neutral time when operating in the full-time driving sensing mode, and thus, Higher signal return. In addition, when operating in the partial driving sensing mode, the driving sensing circuit 13 performs the operations of transmitting the driving signal and receiving the sensing signal in the neutral time (the signal operation processing can be performed in the display time), and driving the sensing circuit 13 The drive sensing is less likely to be interfered by the displayed data signal, so the ability to resist noise is better.

On the other hand, when the driving and sensing circuit 13 is operated in the partial driving sensing mode, if the noise detecting circuit 14 determines that no abnormal noise occurs according to the sensing signals Sc1 to ScN, the noise detecting circuit 14 can control the driving. The sensing circuit 13 switches from the partial driving sensing mode to the full-time driving sensing mode in the neutral time of the next frame time to obtain a higher signal return rate, thereby improving the reliability of the touch sensing. Therefore, the touch display device 1 of the present invention can simultaneously have the advantages of the full-time drive sensing mode and the partial drive sensing mode.

In the partial drive sensing mode of the present invention, when a neutral time is applied, the driving sensing circuit 13 drives a portion of the driving line and receives the sensing signals from the sensing lines of the portion, and is in another (for example, One) at the neutral time, driving another portion of the drive line and receiving the sensed signals from the sense line of the other portion. For example, in the partial driving sensing mode, the driving sensing circuit 13 can drive one-half of the driving lines and receive one-half from the touch electrode layer 11 during the null time of the nth frame time. Sensing signal of the sensing line, and driving the remaining two points when the null time of the n+1th frame time (nth frame time is adjacent to the n+1th frame time, n is a positive integer) A driving line receives the sensing signal from the sensing line of the remaining one of the touch electrode layers 11. For another example, in another implementation manner, the driving sensing circuit 13 can also drive one third of the driving lines in the neutral time of the nth frame time and receive the three points from the touch electrode layer 11 One of the sensing lines of the sensing line, and driving the remaining two-thirds of the driving line in the neutral time of the n+1th frame time and receiving the same from the touch electrode layer 11 The sensing signal of the remaining two-thirds of the sensing line. Or in another embodiment, all the touch electrodes of the touch electrode layer 11 are divided into three equal parts, and the driving sensing circuit 13 drives one third of the driving lines respectively in three consecutive neutral periods. And receive sensing signals from one-third of the sensing lines. Therefore, the partial driving sensing mode of the present invention divides the touch electrode regions (driving lines, sensing lines) of the touch electrode layer 11 into different groups, and drives the groups in different neutral times. For a large-sized touch electrode layer, since the touch electrode layer 11 has many touch electrodes (drive lines, sensing lines), it is difficult to complete all the touch electrodes in a single neutral time. Driving and sensing, therefore, by driving the sensing mode of the present invention, by driving the sensing circuit 13 to drive and sense a part of the touch electrodes respectively at different neutral times, it is possible to effectively overcome the inability to The problem of driving sensing of all the touch electrodes is completed in the neutral time (the problem of insufficient empty time can be solved).

In addition, the signal processing circuit 15 is electrically connected to the driving sensing circuit 13 , the noise detecting circuit 14 and the system circuit 16 . In the partial driving sensing mode, the signal processing circuit 15 processes part of the sensing signal in one frame time, and processes another part of the sensing signal in another frame time, thereby driving in different frame time. The touch electrodes of different portions of the touch electrode layer 11 are sensed. Here, the signal processing circuit 15 can perform signal processing in the display time and the neutral time, and is not particularly limited.

In addition, the system circuit 16 is electrically connected to the display panel 12 and the signal processing circuit 15. The system circuit 16 is the main circuit (for example, including a data driving circuit, a scan driving circuit, a timing control circuit, etc.) for driving and controlling the display panel 12. Here, the system circuit 16 outputs a control signal according to the signal processing result of the signal processing circuit 15 to control the display panel 12 to generate a corresponding action.

In addition, please refer to FIG. 8 , which is a circuit diagram of a noise detecting circuit 14 of the present invention.

The noise detecting circuit 14 includes an operational amplifier AMP, a variable voltage V1, a capacitor C1, two resistors R1, R2, a counter D, and a NOR logic gate G. The negative input terminal of the operational amplifier AMP is electrically connected to the variable voltage V1, the variable voltage V1 is a reference voltage threshold, and the positive input terminal receives the sensing signals Sc1 to ScN. Here, the operational amplifier AMP compares the sensing signals Sc1 to ScN with a reference voltage threshold (variable voltage V1). When the sensing signals Sc1~ScN are greater than the reference voltage, the high level is output, and vice versa, the low level is output.

The counter D is electrically connected to the resistor R1, the capacitor C1 and the output terminal of the operational amplifier AMP. The counter D can calculate the number of the output of the operational amplifier AMP from the high level to the low level, or from the low level to the high level, and output a first signal S1 to control the driving. The sensing circuit 13 (not shown) operates. For example, when the output of the operational amplifier AMP is changed from the high level to the low level, the counter D count is incremented by 1. When the number of counter D counts is greater than a specific value, it indicates that the sensing signals Sc1~ScN are subjected to many noises. Interference, therefore, the counter D can output the first signal S1 to notify the driving sensing circuit 13 to switch the driving sensing mode (for example, switching from the full-time driving sensing mode to the partial driving sensing mode), wherein The signal S1 is a trigger signal for controlling the drive sensing circuit 13 to switch the drive sensing mode.

In addition, one of the input terminals of the NOR logic gate G is electrically connected to the output terminal of the operational amplifier AMP, the capacitor C1, the resistor R1 and the resistor R2, and the other input terminal receives a driving signal Tx outputted by the driving sensing circuit 13. The NOR logic gate G outputs a second signal S2 according to the output of the operational amplifier AMP and the driving signal Tx to control when the driving sensing circuit 13 can prepare to switch the driving sensing mode, wherein the second signal S2 is a control driving sensing. The circuit 13 performs a section signal for switching the drive sensing mode. In more detail, when the output of the operational amplifier AMP and the voltage level of the driving signal Tx are both low, the NOR logic gate G outputs the second signal S2 of the high level, thereby indicating that the first signal S1 can be This section controls the drive sensing circuit 13 to perform the switching drive sensing mode.

For example, in FIG. 4, when the output of the first signal S1 is 1, the driving sensing circuit 13 can perform switching of the driving control mode (for example, switching from the full-time driving sensing mode to the partial driving sensing mode), However, when the output of the second signal S2 is also 1 (for example, when the blank time of the next frame time), the driving sensing circuit 13 can actually enter the partial driving sensing mode (the partial driving sensing mode operates on the display panel). 12 gap time), otherwise the operation of the full-time drive sensing mode is maintained.

In addition, please refer to FIG. 9 , which is a schematic flowchart of a driving sensing method of a touch display device according to a preferred embodiment of the present invention. In this embodiment, the driving sensing method is applied in combination with the touch display device 1 described above, and the touch display device 1 has been described in detail in the foregoing. Ming, I will not repeat them here. The driving sensing method of the present invention includes step S01 and step S02.

In step S01, the driving lines are driven by the driving sensing circuit 13, and the complex sensing signals Sc1 to ScN from the sensing lines are received.

In addition, in step S02, the noise sensing circuit 14 controls the driving sensing circuit 13 according to the sensing signals Sc1 to ScN, wherein the driving sensing circuit 13 operates at the nth frame time of the display panel 12. In a full-time driving sensing mode, at the n+1th frame time of the display panel, the driving sensing circuit operates in a part of the driving sensing mode, and n is defined as a positive integer.

In addition, please refer to FIG. 10 , which is another schematic flowchart of a driving sensing method of a touch display device according to a preferred embodiment of the present invention.

In addition to the above steps S01 and S02, the driving sensing method may further include step S03, wherein the signal processing circuit 15 processes part of the sensing signals in a frame time, and in another figure. The other sensing signals of the other part are processed in the frame time.

In addition, other technical features of the driving sensing method of the touch display device have been described in detail in the foregoing, and those skilled in the art can understand the driving sensing method of the present invention without any disambiguation, and therefore will not be described again. .

According to the above, in a touch display device and a driving sensing method thereof, when the driving sensing mode of the adjacent frame time of the display panel is used, the driving sensing circuit is controlled according to the sensing signals. The full-time drive sensing mode and a part of the drive sensing mode are switched. Wherein, when the noise interference is large, the driving sensing circuit can switch to the partial driving sensing mode, thereby avoiding the interference of the noise and overcoming the problem of insufficient neutral time. In addition, when the noise interference is small, the driving sensing circuit can be switched to the full-time driving sensing mode to obtain a higher signal return rate and improve the reliability of the touch sensing. Therefore, the touch display device and the driving sensing method thereof of the present invention can simultaneously have the advantages of full-time driving sensing and neutral time driving sensing, thereby overcoming the challenge of insufficient noise and neutral time.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

1‧‧‧Touch display device

11‧‧‧Touch electrode layer

12‧‧‧ display panel

13‧‧‧Drive sensing circuit

14‧‧‧ Noise Detection Circuit

15‧‧‧Signal Processing Circuit

16‧‧‧System Circuit

Sc1~ScN‧‧‧ sensing signal

Tx‧‧‧ drive signal

Claims (10)

A touch display device includes: a touch electrode layer having a plurality of driving lines and a plurality of sensing lines; a display panel having a plurality of frame times; and a driving sensing circuit electrically connected to the touch electrode layer The driving sensing circuit drives the driving lines and receives the plurality of sensing signals from the sensing lines, and has a full-time driving sensing mode and a part of the driving sensing mode; wherein, the nth picture of the display panel During the frame time, the driving sensing circuit operates in the full-time driving sensing mode, and the driving sensing circuit operates in the partial driving sensing mode at the n+1th frame time of the display panel, where n is defined as one A positive integer. The touch display device of claim 1, further comprising: a noise detecting circuit electrically connected to the driving sensing circuit, wherein the noise detecting circuit controls the driving according to the sensing signals Sensing circuit. The touch display device of claim 2, wherein the partial drive sensing mode is operated at one of the display panels. The touch display device of claim 3, wherein when the sum of the signals of the sensing signals is greater than a threshold, the noise detecting circuit controls the driving sensing circuit to be sensed by the full-time driving The mode is switched to the partial drive sensing mode. The touch display device of claim 3, wherein the noise detecting circuit controls the driving sensing circuit when the sum of the signal difference values of the two adjacent sensing signals is greater than a threshold The full-time drive sensing mode is switched to the partial drive sensing mode. The touch display device of claim 3, wherein each of the sensing signals is respectively compared with a threshold value, and when the number of the sensing signals is greater than the threshold value, the driving sense is The measurement circuit is switched to the partial drive sensing mode by the full-time drive sensing mode. The touch display device of claim 2, wherein when the portion drives the sensing mode, the driving sensing circuit drives the driving lines of the portion in a neutral time and receives the portions from the portion The sense signals of portions of the sensing line And driving the other portion of the drive lines in another neutral time and receiving the sensed signals from another portion of the sense lines of the other portion. A touch sensing device has a touch electrode layer, a display panel, a driving sensing circuit and a noise detecting circuit, wherein the touch electrode layer has a plurality of driving lines and a plurality of sensing lines, the display panel has a plurality of frame times, the driving sensing circuit is electrically connected to the touch electrode layer, and the noise detecting circuit is electrically connected to the driving sensing circuit, and the driving sensing method comprises Driving the driving lines by the driving sensing circuit and receiving the plurality of sensing signals from the sensing lines; and controlling the driving sensing circuit by the noise detecting circuit according to the sensing signals, wherein During the nth frame time of the display panel, the driving sensing circuit operates in a full-time driving sensing mode, and the driving sensing circuit operates on a part of the driving sense at the n+1th frame time of the display panel Test mode, n is defined as a positive integer. The driving sensing method described in claim 8 is applied to a mutual inductance capacitive touch panel structure or a self-inductive capacitive touch panel structure. The driving sensing method of claim 8, wherein the partial driving sensing mode is operated at one of the display panels.