TWI472995B - Touch display device, driving method thereof, program for getting touch information, and memory device - Google Patents

Description

Touch display device, driving method of touch display device, touch information acquisition program and recording medium

The present invention relates to a touch display device, and more particularly to a touch display device having an AC driven display device and a touch sensor that periodically reads input information of the input interface.

In the past, in the electrostatic capacitive combined touch display device, the sensor substrate for the touch sensor is not provided, and the touch sensor is directly formed on the color filter substrate of the liquid crystal display device, and then the touch sensor is used. The color filter substrate of the sensor is assembled with the thin film transistor array substrate to form a liquid crystal display device with a touch function. Such a so-called in-cell touch panel can be referred to Patent Document 1.

Since the in-cell touch display device 70 has one glass substrate as compared with a touch display device having an additional touch sensor substrate, it has the advantages of being thinner, improving transmittance, and reducing cost.

[Advanced technical literature]

Patent Document 1: JP-A-2008-32756

However, the above-mentioned in-cell touch display device has a structure close to a thin film transistor (TFT) array substrate, and thus is susceptible to the action of the transistor, and coupling noise is likely to occur, so that there is relatively touch information. The problem of detecting the decrease in sensitivity.

Therefore, the object of the present invention is to provide a touch display device and a touch display device capable of reducing the influence of the driving of the display device on the touch sensor and detecting the touch information with a high S/N ratio. Driving method, touch information acquisition program and recording medium.

In order to achieve the above object, the touch display device includes an AC-driven display device and a touch sensor that periodically reads touch information of the input interface, and the touch display device includes: a touch information detecting device, The reading period of the touch sensor starts synchronously with the frame period of the display device, and detects the touch information of each frame period; and the touch information computing device calculates the continuous even number of the frame periods The average of the touch information is obtained as a touch information statistical value.

In the driving method of the touch display device, the touch display device includes an AC driven display device and a touch sensor that periodically reads touch information of the input interface, and the driving method includes: a touch information detecting step The touch period of the touch sensor is synchronized with the frame period of the display device to detect the touch information of each frame; and the touch information calculation step is performed for consecutive even frames. The average of the touch information is obtained as a touch information statistical value.

According to the present invention, it is possible to obtain touch information with less noise.

[Example 1]

Fig. 1 is a cross-sectional structural view showing an example of a touch display device 70 according to a first embodiment of the present invention. In the first embodiment, the touch display device 70 of the first embodiment includes a touch sensor 10, a touch sensor controller 20, a color filter substrate 40, a thin film transistor array substrate 50, and a display device driving circuit 60. .

The touch sensor 10 and the touch sensor controller 20 constitute a touch sensor module, and the color filter substrate 40, the thin film transistor array substrate 50, and the display device drive circuit 60 constitute a display device. The touch sensor 10 is formed on the color filter substrate 40, and the color filter substrate 40 is combined with the thin film transistor array substrate 50, the display device driving circuit 60, and the touch sensor controller 20 to form An in-cell touch display device 70. The touch sensor 10 is formed of a transparent electrode layer such as ITO (Indium Tin Oxide), and is formed on the same side of the color filter substrate 40 together with an element layer such as a color filter. The in-cell touch display device 70 does not have a substrate dedicated to the touch sensor 10, and has the advantages of being thinner, improving transmittance, and reducing cost.

A liquid crystal display device is formed by filling a liquid crystal between the color filter substrate 40 and the thin film transistor array substrate 50. The liquid crystal display device displays an image by driving of the display device drive circuit 60. Here, since the touch sensor 10 is very close to the thin film transistor array of the thin film transistor array substrate 50, it is easily affected by noise generated when the thin film transistor is driven. In particular, in the case where the touch sensor 10 is a capacitive touch sensor, this configuration is prone to coupling noise and a decrease in the S/N ratio.

The touch sensor controller 20 is a device that drives and controls the touch sensor. In the touch display device 70 of the present embodiment, by mounting various functions described later on the touch sensor controller 20, it is possible to realize high S/ in the in-cell touch display device 70 shown in FIG. N ratio.

Fig. 2 is a plan view showing an example of an electrode structure of the touch sensor 10 according to the first embodiment of the present invention. The touch sensor 10 is arranged in a matrix in which the X detecting electrodes 11 extending in the (vertical) vertical direction and the Y detecting electrodes 12 extending in the horizontal direction. In Fig. 2, there are M strips of X detecting electrodes 11, and N strips of Y detecting electrodes 12, which form a matrix of M x N (M rows and N columns).

The X detection electrodes 11 and the Y detection electrodes 12 arranged in a matrix are set to the sensor coordinate system. In FIG. 2, the lower left corner of the touch sensor 10 is set to (1, 1), and the upper right corner is set to (M, N). On the other hand, although the second drawing is depicted as a plane, the X detecting electrode 10 and the Y detecting electrode 12 are arranged to face each other with a space therebetween. When the finger or the stylus touches the input interface of the touch sensor 10, if it is a capacitive touch sensor, the electrostatic capacitance between the X detecting electrode 11 and the Y detecting electrode 12 changes, if it is impedance The membrane touch sensor detects the touch position by using the continuity detection.

In this embodiment, an electrostatic capacitive touch sensor is used as an example. In the capacitive touch sensor, press (1,1)→(2,1)→...(M,1)→(1,2)→...(M-1,N)→(M,N The sequence is scanned one by one along the line, and the touch information of each coordinate point is read and detected. When a line is replaced, the line is replaced, and the lines are sequentially scanned. Finally, the touch information of all the coordinates of all the lines is detected, that is, the input interface (touch surface) of the touch sensor 10 is completely The touch information is checked out. Since the touch intensity information and the detected coordinates can be specified by the touch intensity data including the touch, the touch information includes the data of the touch position. In the case of 2-value data, the intensity of the touch cannot be detected, and only the presence or absence of the touch can be detected.

Fig. 3 is a block diagram showing an example of a touch display device 70 according to Embodiment 1 of the present invention. In Figure 3, only the components necessary to achieve functionality are shown.

In the third embodiment, the touch display device 70 of the first embodiment includes a touch sensor 10, a touch sensor controller 20, a thin film transistor array substrate 50, and a display device drive circuit 60. The touch sensor 10 includes an X detection electrode 11 and a Y detection electrode 12 . The touch sensor controller includes a touch information detecting device 21 and a touch information computing device 25. The touch information detecting device 21 includes a reading device 22, a timing control device 23, and a memory device 24.

The touch sensor 10 and the thin film transistor array substrate 50 have been described in the first embodiment, and the same reference numerals will be given to the same components, and the description thereof will be omitted.

The display device driving circuit 60 is used to drive the display device of the touch display device 70, and is constituted by a driver IC or the like. The display device of the present embodiment is driven in a face-reversed manner.

Fig. 4 is a schematic view showing the driving of the face inversion mode. In Fig. 4, an example of the data source voltage waveform of the signal period 2T is shown. As shown in Fig. 4, the data signal voltage applied to the display device is an AC voltage waveform in which the positive and negative polarities are alternately inverted once per cycle. As shown in Fig. 4, since the magnitude (brightness) of the applied voltage signal is different, the difference between V1, V2, and V3 is caused, but all three are inverted at the same period T. The period T and the display device display a frame period of one frame for the same length of time. Generally, the display device is driven at 60 Hz, so the frame period is 1/60 = 0.01666...=16.6 msec. That is to say, a new screen is displayed at the same time as the polarity is reversed at 16.6 msec, and thus a display device for displaying a continuous image is constructed.

In the present embodiment, for the sake of easy understanding, the sub-pixels of the entire frame period of each frame are described as an example of the face inversion driving method of inverting to the same polarity, but each frame phase is also included. A dot inversion driving method in which adjacent sub-pixels are inverted to positive and negative polarities different from each other, or a line inversion driving method in which each frame is inverted in line units to positive and negative polarities different from each other. Regardless of the inversion driving method, in the pixel unit, the polarity inversion is performed for each frame period, and the positive polarity data signal voltage and the negative data signal voltage are alternately applied with such an AC driving. In the line inversion driving method, in addition to the column inversion driving method in which each column is reversed to positive and negative polarities different from each other, and the row inversion driving method in which each row is reversed to positive and negative polarities different from each other, an H line is also included. Various line inversion driving methods such as inversion driving method and V line inversion driving method. The dot inversion driving method is not limited to the inversion of adjacent sub-pixels, and includes various dot inversion driving methods such as a 2-point inversion driving method.

Returning to Fig. 3, the display device driving circuit 60 sequentially drives the thin film transistor array on the thin film transistor array substrate 50 so that the display device displays one picture every 1.66 msec.

The touch information detecting device 21 starts the reading operation of the touch sensor 10 in a state in which the frame period of the display device is synchronized, and detects the touch information to the touch sensor 10 in each frame. . In the touch display device 70 of the prior art, the display device driving circuit 60 and the touch sensor controller 20 operate independently of each other. However, in the touch display device 70 of the present embodiment, the touch sensor 10 is read. The action of the touch information is started in synchronization with the frame period of the display device.

The reading device 22 is a device that reads touch information input to the input interface of the touch sensor 10 . As described in FIG. 2, scanning is performed along the Y detecting electrode 12 or the X detecting electrode 11, and the touch information of each coordinate is sequentially read. Specifically, the electrostatic capacitance of each line is read to sequentially detect the touch information, and the data of the read touch information is stored in the memory device 24. The reading device 22 performs a full scan by reading the full electrodes 11, 12, and thus also has a predetermined reading period.

The timing control device 23 is a device that controls the start timing of the reading operation of the reading device 22. In the touch display device 70 of the present embodiment, the reading operation of the reading device 22 is started in synchronization with the frame period of the display device. Therefore, the sequence control device 23 acquires the frame period of the display device by the display device drive circuit 60, and starts the reading operation of the reading device 22 in synchronization with the frame period.

The memory device 24 is a device for sequentially storing touch information read by the reading device. The minimum limit of the memory device 24 may be a buffer for detecting the interface capacity of the touch sensor 10, and more touch information can be memorized when a plurality of touch information is obtained in one frame period. The memory device 24 can be composed of general memory for a computer or the like.

The reading device 22, the timing control device 23, and the memory device 24 constitute a touch information detecting device 21 that detects touch information in each frame period of the touch display device 70.

The touch information computing device 25 calculates an average of consecutive even frames from the read data of each frame period detected by the touch information detecting device 21, and obtains the touch information statistical value used for the noise cancellation. . The average calculation method may be, for example, calculating an average moving average method from a continuous predetermined number of average reading data for each frame period, or calculating the touch data without obtaining a frame period for each frame period. The calculated touch information is obtained under the frame period in which a continuous even number of touch information is accumulated, and the total average method of the interval is set. In other words, when you want to accurately obtain the touch information statistics of each frame period, you can use the moving average method to calculate the average. If you want to reduce the number of data and reduce the calculation burden, you can use the total average method of the set interval. To get the touch information statistics. Reducing the computational burden can reduce the size of the computing circuit and reduce the cost. Therefore, the calculation method of the touch information statistical value of the touch information computing device 25 can adopt different kinds of averaging methods depending on the application.

FIG. 5 is a diagram for explaining calculation processing performed by the touch information computing device 25. The fifth (A) diagram shows an example of the read data of the touch sensor 10 detected in the state affected by the noise. The fifth (B) diagram shows an example of the touch information statistical value of the touch information computing device 25.

In the fifth (A), the detection data 101 of the touch sensor 10 is displayed on the positive electrode when the display device is positively driven, and the detection data 102 of the touch sensor 10 is displayed on the negative electrode when the negative polarity is driven. The detection data 101 of the positive electrode is composed of the positive noise 81 when the display device is driven and the touch information 91 of the touch sensor 10, and the negative noise 82 and the touch when the negative detection data 102 is driven by the display device The touch information material 92 of the sensor 10 is configured. However, the driving of the positive polarity and the negative polarity occurs in different frame periods, so the positive polarity and the negative polarity are not in the same frame period, but in order to be easily understood, the same frame period in the fifth (A) diagram The detected data 101 of the touch sensor 10 of the positive polarity frame period and the detected data 102 of the touch sensor 10 of the negative polarity frame period are displayed.

In the positive polarity and negative polarity detection data 101 and 102, the touch information material 91 of the positive polarity frame period is affected by the positive noise 81. The touch information material 92 of the negative frame period is affected by the negative noise 82. That is to say, the touch information materials 91 and 92 are respectively affected by the noise of the corresponding frame period polarity.

Here, the positive noise 81 and the negative noise 82 are almost the same waveform, and only the polarities are different. The touch information materials 91 and 92 are almost the same waveform and are also positive data. Therefore, when the positive polarity detection data 101 is added to the negative polarity detection data 102, only the positive noise 81 and the negative noise 82 cancel each other, and the touch information materials 91 and 92 are added at the positive polarity. Finally, get a clean signal of noise cancellation.

The fifth (B) diagram shows the calculated data 103 after the detected data 101 and the detected data 102 are added. As shown in Fig. 5(B), the positive polarity noise 81 is offset by the negative polarity noise 82, and the calculated data 103 is the sum of the pure touch information materials 91, 92 without noise.

In this way, the detected data 101 of the touch sensor 10 when the positive polarity frame of the display device is driven is added to the detected data 102 of the touch sensor 10 when the negative polarity frame is driven, and then the moving average method is used. Get the touch information statistics value, and get the touch information signal with high S/N ratio after the noise is cancelled.

In the fifth (B) diagram, although the waveform of the calculated data 103 having no noise state is displayed, in the case of the movie, since the data written in the continuous frame period is not the same, the noise is not completely zero. However, since there are very few images of extremely different materials written in successive frame periods, the noise is mostly substantially offset by each other.

Returning to Fig. 3, the calculation processing performed by the touch information computing device 25, as explained in Fig. 5, starts the reading of the data detected by the synchronization starting from the positive polarity frame and the synchronization starts at the negative polarity frame. The detected readings are added together and the moving average is calculated. In this way, it is possible to obtain touch data statistics with less noise.

In the third embodiment, the touch information detecting device 21 and the touch information computing device 25 are means for performing various types of calculation processing described above, and include, for example, an electronic circuit including an ASIC (Application Specific Integrated Circuit) and a CPU in which the reading program operates. Center Processing Unit, central processing unit, or computer. The functions of the touch information detecting device 21 and the touch information computing device 25 can be realized by a program for causing a computer to operate or for recording the program on a computer-readable recording medium.

FIG. 6 is a diagram showing a driving method of a touch sensor and a touch sensor according to Embodiment 1 of the present invention. In Fig. 6, various timings of the synchronization start of the touch sensor 10 of the frame period of the display device are shown. Specifically, with the frame and driving timing of the display device, the scanning timing of the touch sensor, the influence of the noise, the average value of the data, and the influence of the average noise are displayed.

First, when the display device is turned off, only the scan reference data of each of the coordinates (1, 1) to (M, N) is acquired. The scan baseline data was obtained to offset the naturally occurring noise to make corrections. The scan reference data will be used in the calculation of the subsequent touch information. At this stage, the display device is not yet driven, and no noise effects will occur.

In the first frame period, the display device is driven by a positive data voltage. The touch sensor 10 starts synchronously with the positive polarity frame period, and starts reading by the reading device 22 of the touch information detecting device 21. The reading action can be performed by scanning the scanning action of each line in sequence. The read operation start timing of the reading device 22 is controlled by the timing control device 23.

In general, the data reading period of the touch sensor 10 is shorter than the display period of 16.6 msec of the frame period of the display device, because the general reading speed (frequency) is faster than 60 Hz, so the display device is Before the end of a frame period, the touch information of the touch sensor 10 has been read. Here, even if the reading is completed, the next scan is not performed, but the end of the first frame period of the display device is waited for. The read data RAW[1] read is stored in the memory device 24. In addition, the data obtained by this reading will be affected by the positive noise of the display device.

In the second frame period, the display device is driven by a negative data voltage. The touch sensor 10 starts synchronously with the negative polarity frame period, and starts the reading operation. At this time, the information of the touch information is affected by the negative noise of the display device. The read detection data RAW[2] and the moving average (RAW[1]+RAW[2])/2 of RAW[1] stored in the memory device 24 are calculated by the touch information computing device 25, and This value is used as the detected data average AVG [1]. The noise of the detected data average AVG[1] is offset by the first frame driven by the positive polarity and the second frame driven by the negative polarity, so that the touch information statistical value that is not affected by noise can be obtained. .

In the third frame, the display device is driven by a positive data voltage. In the same manner as the first and second frame periods, the touch sensor 10 starts synchronously with the timing of the start of the positive polarity frame driving, starts reading scanning, and detects the data of the touch information. At this time, the data of the touch information is affected by the positive noise of the display device, but the moving average is calculated with the data of the second frame affected by the negative noise (RAW[2]+RAW[3] ) /2, the positive and negative noises are offset each other, and the average value of the detected data AVG[2] that is not affected by the noise is also the touch information statistics.

Similarly, in the fourth frame of the application of the negative polarity data voltage, the moving average is calculated from the third frame period of the previous positive polarity data voltage, and the detected data average value AVG [3] is obtained. In the fifth frame period of the positive polarity drive, the moving average is calculated from the fourth frame period of the previous negative polarity drive, and the detected data average value AVG [4] is obtained. In this way, since the drive polarity of the frame that is continuous before and after the display device is always a positive or negative combination, the average value of the touch information data detected by the consecutive frames can be calculated, and the touch of the noise can be offset. Information statistics.

Fig. 7 is a view showing an example of a processing flow of each frame period of the touch display device 70 and the driving method thereof according to the first embodiment of the present invention.

In step 100, the touch sensor 10 starts synchronously with the frame period of the display device, and starts reading of the touch information. The reading operation is performed by the reading device 22 of the touch information detecting device 21. The timing at which the reading starts is controlled by the timing control device 23. The read start timing is not fully synchronized with the display device, and can be initiated at a slightly delayed time. The scanning period of the touch sensor is mostly shorter than the frame period of the display device, so that the touch information can be detected in the frame period.

In step 110, the touch information of the touch sensor 10 in the frame period of the synchronization start is detected. The detected touch information is stored in the memory device 24.

In step 120, the moving average of the detected data is calculated for the consecutive even number of frame periods including the frame period detected in step 110, because the touched information that has been detected is taken as an object, so of course in the step The detected data obtained in the frame period before the frame period in which the detection is performed in 100 to 110 is targeted. Thereby, the noise influence of the display device can be offset, and the touch information statistical value of the high S/N ratio can be obtained. The calculation of the moving average is performed by the touch information computing device 25.

In the first embodiment, although the moving average of the detected data is calculated for two consecutive frames, as long as the same number of positive polarity driving and negative driving frame periods are included, four or six consecutive frames may be used. The frame period calculates the moving average to obtain the average value of the touch information detection data. By increasing the average number of data, more precise touch information statistics can be obtained. A specific embodiment for increasing the number of frame periods of the averaging object will be described later.

By performing steps 100 to 120 for each frame in sequence, it is possible to obtain touch information with less noise.

In the first embodiment, the moving average of the detected data is calculated, and the touch information statistical value is obtained for each frame period, but the average of the two positive polarity driving and the negative driving driving frame may be obtained for each pair. Touch information statistics. Although the touch information statistics value is calculated every time a frame is separated, if the number of data frames is half of the frame period, the touch information statistics value can be obtained for each of the two frame period intervals. . Thereby, the burden of the calculation process can be reduced and the structure of the touch information computing device can be simplified. If you want to further reduce the burden of calculation processing, you can calculate the average for every two frame periods, and get one touch information statistics for every four frame periods, or get one touch information for every six frames. Statistics. As long as the interval for calculating the average value range is a continuous even number of frame periods, there are quite a few choices.

Fig. 8 is a view showing an embodiment of the touch sensor of the first embodiment and a driving method thereof. Figure 8(A) shows the reference data, Figure 8(B) shows the touch information detection data when the display device is in an odd frame period, and Figure 8(C) shows the display device in the even frame period. The touch information is detected, and the 8th (D) image shows the statistical value of the touch information obtained after the average touch information is detected. Among them, the same elements as those described so far will be denoted by the same reference symbols. In each figure, the horizontal plane is the sensor coordinates (X, Y), and the vertical axis represents the sensor signal level.

In Fig. 8(A), the reference data is detected before the display device is started. Since the display device that displays the input screen is not yet driven, the reference material is detected in a non-touch state without touch input. Thereby, it is possible to maintain a state in which each coordinate signal is zero.

Figure 8(B) shows the touch information detection data RAW[1] when the display device is driven in an odd frame period, and the eighth (C) image shows the touch information when the display device is driven in an even frame period. Check out the data RAW[2]. In the 8th (B) and 8th (C) drawings, the finger image showing the finger touch is detected as the touch information. Comparing the two, the position of the finger image is also at the position of the coordinate 10 in front, and the sensor signal level is negative. On the other hand, the portions other than the finger image are offset from each other in the positions of the peaks in the eighth (B) and eighth (C) drawings.

In order to obtain a finger image with noise cancellation, the calculation as in equation (1) is performed. Benchmark data - (RAW[1] + RAW[2]) / 2 = noise offset finger image data... (1)

Figure 8(D) shows the noise data calculated by the calculation of (1) and offsets the finger image data. As shown in Fig. 8(D), it is possible to obtain a finger image of a high S/N ratio in which noise other than the finger image is offset.

As described above, according to the touch sensor of Embodiment 1 and the driving method thereof, two consecutive frame periods are averaged, and the average value is subtracted from the reference material, and a sharp finger image with a high S/N ratio can be obtained.

[Embodiment 2]

FIG. 9 is a diagram showing a driving method of a touch sensor and a touch sensor according to Embodiment 2 of the present invention. Fig. 9 is a timing chart showing the same format as Fig. 6 of the first embodiment. In the second embodiment, the same constituent elements as those in the first embodiment will be denoted by the same reference numerals, and the description will be omitted.

In Fig. 9, the frame period and the driving timing of the display device are the same as those in Fig. 6. In the second embodiment, the frame period of the scanning start timing crystal display device of the touch sensor 10 is started synchronously, which is the same as in the first embodiment. In the second embodiment, the touch information reading of the touch sensor 10 performed twice in one frame period is different from that of the first embodiment. The reading period of the touch sensor 10 is generally shorter than 16.6 msec, and the reading speed is 60 Hz or more. This has been explained in the first embodiment. For example, when the reading speed of the touch sensor 10 is set to 120 Hz or more, as shown in FIG. 9, the full scan can be repeated twice in one frame period.

In this case, two touch information materials are detected in each frame period. In this case, the moving average of the consecutive frame periods is calculated to obtain the touch information statistics of the noise cancellation. At this time, between the detected data detected in the same order of the cycles in each frame is calculated. The moving average, for example, the moving average of the detected data RAW[1] of the first frame period and the detected data RAW[3] of the second frame period, and the detected data of the first frame period RAW [2] The moving average of the detected data RAW[4] with the second frame period. That is to say, the moving average is calculated by the equation of (RAW[X]+RAW[X-2])/2.

The first frame period of the display device is the time for writing the first picture. Therefore, when the picture is written from the upper side in the vertical direction, the writing of the upper half of the picture is in the first half of the frame period, and the second half of the frame period. Write for the lower half of the screen. If the detected data of the touch sensor between the screens in the same field is not added, the synchronization in the frame period cannot be obtained, and the addition of different data becomes unnecessary, and the detection of the data becomes meaningless. . Therefore, the moving average of the detected data RAW[1] read from the first reading of the first frame period and the detected data RAW[3] of the first reading of the second frame period is detected. The data average value AVG[1], the detected data RAW[2] from the second reading of the first frame period and the second reading of the second frame period RAW[4] The moving average obtains the average value of the detected data AVG [2]. Through such calculations, it is possible to obtain the detected data average values AVG[1] and AVG[2] which eliminate the influence of noise. After that, AVG[1] and AVG[2] can be used as data corresponding to the two second frame periods, or the average value can be calculated by (AVG[1]+AVG[2])/2. Corresponding to the touch information statistics of the second frame period.

After the third frame, the same processing method is used, and the precise touch information statistical value can be calculated from the plurality of detected data. According to the touch display device 70 and the driving method thereof according to the second embodiment, two pieces of data can be used for each frame period to obtain precise touch information statistical values.

In the average calculation, the average of the average frame period can be calculated after the interval to be averaged to obtain the touch information statistical value, which is the same as in the first embodiment.

[Example 3]

FIG. 10 is a diagram illustrating a method of driving the touch sensor 10 and the touch sensor 10 according to Embodiment 3 of the present invention. Fig. 10 is a timing chart showing the same format as that of the sixth embodiment of the first embodiment and the ninth embodiment of the second embodiment.

In the second embodiment, one frame period is read twice, but in the third embodiment, one frame period is read three times, which is different from the second embodiment. At this time, the reading speed of the reading device 22 is set to be 180 Hz or more. In this way, as shown in FIG. 10, three detected data can be obtained in one frame period.

The noise cancellation calculation performed by the touch information computing device 25 is performed in the same frame period as before, and as in the description of the second embodiment, each of the three detected data is calculated separately. The moving average between the detected data read in the same detection order in each frame period. In other words, the moving average of the detected data RAW[1] of the first frame period and the detected data RAW[4] of the second frame period, and the detected data RAW of the first frame period are calculated. 2] The moving average of the detected data RAW[5] with the second frame period, and the detected data RAW[3] of the first frame period and the detected data of the second frame period RAW[6] ] The moving average. Thereby, the detected data average values AVG[1], AVG[2], AVG[3] of the noise cancellation can be calculated and used as the touch data statistics of the second frame. The three data in one frame period can be directly used for subsequent calculations. In the case of one frame period, only one data can be calculated (AVG[1]+AVG[2]+AVG[ 3])/3, as the touch information statistics.

After the third frame period, the same processing method is used, and three touch information materials are acquired in one frame period, so that most of the data can be used to obtain precise touch information.

In the second embodiment, the touch sensor 10 is scanned twice in a frame period. In the third embodiment, the touch sensor 10 is scanned three times in a frame period, but if the touch sensor 10 is If the reading speed is faster, it can be scanned more times in one frame period.

The average calculation method is not only the moving average, but the total average method of the predetermined interval can be used to calculate the touch information statistics for each predetermined number of frame periods, which is the same as in the first embodiment and the second embodiment.

According to the touch display device 70 and the driving method thereof according to the second and third embodiments, the touch sensor 10 scans a plurality of times in a frame period, and the precise touch information statistical value can be obtained.

[Example 4]

FIG. 11 is a diagram showing a driving method of a touch sensor and a touch sensor according to Embodiment 4 of the present invention. Fig. 11 is a timing chart showing the same format as Fig. 6 of the first embodiment, ninth embodiment of the second embodiment, and tenth embodiment of the third embodiment.

In the fourth embodiment, the scanning timing of the touch sensor 10 and the method of detecting the touch information data are the same as those in the first embodiment. The method of calculating the detected data average values AVG[1] and AVG[2] in the second frame and the third frame period is also the same as in the first embodiment.

In the fourth frame of the fourth embodiment, when the detected data average value AVG[3] is calculated, the four detected data RAW[1] detected in the four frame periods of the first to fourth frames are calculated. The moving average of RAW[2], RAW[3], and RAW[4] is different from that of the first embodiment. The first frame is the positive polarity drive, the second frame is the negative polarity drive, the third frame is the positive polarity drive, and the fourth frame is the negative polarity drive, the number of positive and negative drive is the same. In the display device of the surface inversion driving method, the driving of the positive polarity and the negative polarity is always alternated, so the number of positive and negative driving cycles of the even even number of frames is always the same. Therefore, when the average value of the detected data is calculated for four or more consecutive even frame periods, the noise generated by the display device can be offset positively and negatively, and the touch data statistical value of the noise cancellation can be obtained.

In the eleventh figure, after the fifth frame period, the detected data RAW[2] to RAW[5] and RAW[3] to RAW[6] detected in the same four frame periods are similarly calculated. The data averages AVG[4] and AVG[5] are detected as statistical data of touch data. Among them, the general formula of the moving average is as shown in the formula (2). (RAW[X]+RAW[X-1]+RAW[X-2]+RAW[X-3])/4...(2)

As described above, by calculating the average value by increasing the number of data, the average accuracy can be improved, and the coupling noise or thermal noise caused by the influence of the display device can be corrected.

In the fourth embodiment, regarding the second frame period and the third frame period, in order to reduce the number of data, the detected data AVG[1] is calculated from the consecutive two frame periods in the same manner as in the first embodiment. , AVG [2], but the whole equation (2) can be used, and the average value of the detected data is calculated from the fourth frame period. The details of such calculation processing can be variously set depending on the purpose.

According to the touch display device 70 and the driving method thereof of the fourth embodiment, by using four or more consecutive pieces of detected data, it is possible to increase the number of sampled data for calculating the average value and obtain precise touch information statistics with less noise. value.

In the fourth embodiment, the average value is calculated once for each of the even four or more even pieces of the detected data. Although the total number of data is reduced, the accuracy of the calculated touch information statistical value can be sufficiently improved, and the burden of calculation processing is greatly reduced.

[Example 5]

Fig. 12 is a view showing an example of the electrode composition of the touch sensor of the fifth embodiment of the present invention. Fig. 12(A) is a plan view showing an example of a Y detecting electrode layer of the touch sensor of the fifth embodiment. Fig. 12(B) is a plan view showing an example of an X detecting electrode layer of the touch sensor of the fifth embodiment.

In the second and third embodiments of the first embodiment, the linear X-detection electrode 11 and the Y detection electrode 12 are used to describe the configuration of the touch sensor 10, but as shown in Figs. 12(A) and 12(B). As shown in the figure, the detecting electrodes may be connected in a small square to form the touch sensor 10. In the Fig. 12(A), the Y detecting electrode layer 14 is shown, and the Y detecting electrode 16 having the slanting connection in the lateral direction is shown. In the Fig. 12(B), the X detecting electrode layer 13 is shown, and the X detecting electrode 15 having the longitudinal spur connection is shown. The electrode shapes of the two are different from the X detection electrode 11 and the Y detection electrode 12 of FIGS. 2 and 3, but the plurality of Y detection electrodes 16 extending in the lateral direction in the 12th (A) diagram are arranged in parallel. In the 12th (B) diagram, a plurality of X detecting electrodes 15 extending in the longitudinal direction are arranged in parallel, and are the same as the Y detecting electrodes 12 and the X detecting electrodes 11 from the viewpoint of arrangement.

Fig. 13 is a view showing the composition of the touch sensor 19 of the fifth embodiment of the present invention. Fig. 13(A) shows the planar configuration of the internal electrode layer 17 of the touch sensor 19 of the fifth embodiment. Fig. 13(B) is a perspective view showing the entirety of the touch sensor 19 of the fifth embodiment.

In Fig. 13(A), the planar structure of the electrode layer 17 is shown. The X detection electrode 15 and the Y detection electrode 16 are disposed so as not to overlap each other to increase the surface area.

In the thirteenth (B) diagram, the overall configuration of the touch sensor 19 is shown. After the Y detecting electrode layer 14 and the X detecting electrode layer 13 are laminated, the glass cover 18 covers the surface. The touch sensor 19 of this configuration can be used to form the touch display device 70 of the present embodiment.

In addition, the structure of the touch sensors 10 and 19 can adopt various configurations depending on the internal electrode structure or the external structure, and various touch sensors 10 and 19 can form a touch display with less noise. Device 70.

[Embodiment 6]

Fig. 14 is a cross-sectional structural view showing an example of the touch display device 71 of the sixth embodiment of the present invention. In FIG. 14 , the touch display device 71 of the embodiment 6 includes a touch sensor 10 , a touch sensor controller 20 , a sensor glass 30 , a color filter substrate 40 , and a thin film transistor array substrate. 50. Display device drive circuit 60. The touch sensor 10, the touch sensor controller 20, and the sensor glass 30 constitute a touch sensor module, and the color filter substrate 40, the thin film transistor array substrate 50, and the display device drive circuit 60 are configured. Touch display device 71.

In the touch display device 71 of the sixth embodiment, the touch sensor 10 is not disposed inside the display device, and the sensor glass 30 is disposed on the color filter substrate 40, and is disposed on the sensor glass 30. There is a touch sensor 10 composed of a transparent electrode layer such as ITO. In other words, the touch display device 71 of the embodiment 6 is different from the in-cell touch display device 70 of the first embodiment, and the touch sensing module is independently disposed on the display device. structure.

As such, the touch display device 71 of the present embodiment may also be a structure in which the touch sensor module and the display device are independent of each other. Generally, in the individual touch display device 71 of the module, although the sensor glass 30 is disposed between the touch sensor 10 and the color filter substrate 40, the shielding effect is improved, but if In the case where the noise of the display device is large, the touch display device 71 of the present invention and the driving method thereof can also be used to obtain touch information with less noise.

[Embodiment 7]

As a modification of the first embodiment, an on-cell structure may be employed. Similarly, the touch sensor 10 is formed on the color filter substrate 40, but the color filter element layer is formed in color. The different sides of the filter substrate 40 are such that when the color filter substrate 40 and the thin film transistor array substrate 50 are assembled, the touch sensor 10 is exposed to the outside. The external touch display device 70 is relatively susceptible to the thin film transistor array of the thin film transistor array substrate 50 despite the presence of the color filter substrate 40 in the touch sensor 10 and the thin film transistor array substrate 50. Therefore, the external touch display device 70 can also be applied to the embodiment of the present invention, thereby obtaining the touch information statistical value of the high S/N ratio.

As described above, the touch display device and the driving method thereof can be applied to various touch display devices in which the touch sensors 10 and 19 are affected by the display device driving noise. Thereby, the touch information statistics with less noise and high S/N ratio can be obtained.

The preferred embodiments of the present invention have been described above, but the present invention is not limited to the embodiments described above, and various modifications and substitutions may be made to the above-described embodiments without departing from the scope of the invention.

For example, in the present embodiment, the display device is an example of a liquid crystal display device. However, as long as it is an AC drive and the drive AC voltage applied to each pixel is reversed, the polarity of each frame period is reversed. A variety of different display devices are utilized.

[Possibility of industrial use]

The present invention can be applied to a touch display device that displays an image on a display device on an input interface and performs an input operation by touch of a finger or the like.

10, 19. . . Touch sensor

11, 15. . . X detection electrode

12, 16. . . Y detection electrode

13. . . X electrode layer

14. . . Y electrode layer

17. . . Electrode layer

18. . . glass cover

20. . . Touch sensor controller

twenty one. . . Touch information detection device

twenty two. . . Reading device

twenty three. . . Timing control device

twenty four. . . Memory device

25‧‧‧Touch information computing device

30‧‧‧Sensor glass

40‧‧‧Color filter substrate

50‧‧‧Film transistor array substrate

60‧‧‧Display device driver circuit

70, 71‧‧‧ touch display device

81‧‧‧Positive noise

82‧‧‧negative noise

91, 92‧‧‧ Touch information materials

101, 102‧‧‧Detected information

103‧‧‧ Calculating information

Fig. 1 is a cross-sectional structural view showing an example of a touch display device 70 according to a first embodiment of the present invention.

Fig. 2 is a plan view showing an example of an electrode structure of a touch sensor of the touch display device 70 according to the first embodiment of the present invention.

Fig. 3 is a block diagram showing an example of a touch display device 70 according to Embodiment 1 of the present invention.

Fig. 4 is a schematic view showing the driving of the face inversion mode.

FIG. 5 is a diagram for explaining a calculation process performed by the touch information computing device, wherein the fifth (A) image shows an example of the read data of the touch sensor 10 detected in a state affected by noise. The fifth (B) diagram shows an example of the touch information after the touch information computing device 25 calculates the processing.

FIG. 6 is a diagram showing a driving method of a touch sensor and a touch sensor according to Embodiment 1 of the present invention.

Fig. 7 is a view showing an example of the processing flow of each frame of the touch display device 70 and the driving method thereof according to the first embodiment of the present invention.

Fig. 8 is a view showing an embodiment of the touch sensor of the first embodiment and a driving method thereof.

FIG. 9 is a diagram showing a driving method of a touch sensor and a touch sensor according to Embodiment 2 of the present invention.

FIG. 10 is a diagram showing a driving method of a touch sensor and a touch sensor according to Embodiment 3 of the present invention.

FIG. 11 is a diagram showing a driving method of a touch sensor and a touch sensor according to Embodiment 4 of the present invention.

FIG. 12 is a view showing an example of an electrode composition of a touch sensor according to Embodiment 5 of the present invention, wherein FIG. 12(A) is a plan view showing an example of a Y detecting electrode layer of the touch sensor of Embodiment 5. Fig. 12(B) is a plan view showing an example of an X detecting electrode layer of the touch sensor of the fifth embodiment.

Figure 13 is a view showing the composition of a touch sensor according to Embodiment 5 of the present invention. 13(A) is a plan view showing the planar structure of the internal electrode layer 17 of the touch sensor 19 of the fifth embodiment; and FIG. 13(B) is a perspective view showing the entire touch sensor 19 of the fifth embodiment.

Fig. 14 is a cross-sectional structural view showing an example of the touch display device 71 of the sixth embodiment of the present invention.

Claims (16)

A touch display device comprising an AC driven display device and a touch sensor for periodically reading touch information of the input interface, the touch display device comprising: a touch information detecting device, the touch sensing device The reading period of the device is synchronized with the frame period of the display device to detect the touch information of each frame period; and the touch information computing device calculates the touch information for a continuous even number of the frame periods. On average, a touch information statistic is obtained, wherein the read action is an operation of reading the touch information of the input interface in a plurality of cycles during a frame period, and the touch information detecting device detects each frame period In the plurality of touch information, the touch information computing device calculates an average of the touch information detected in the same order for the plurality of touch information detected in each frame period. The touch display device of claim 1, wherein the touch information is a moving average of the touch information. The touch display device according to claim 1, wherein the reading operation is an operation of scanning the electrodes arranged in a matrix configuration for detecting the touch information one by one. The touch display device of claim 1, wherein the touch sensor is an electrostatic capacitive touch sensor. The touch display device of claim 1, wherein the touch display device is an in-cell touch display device. The touch display device of claim 1, wherein the The touch display device is an external touch display device. The touch display device of claim 1, wherein the touch sensor is a separate component formed on the sensor glass, and the sensor glass is disposed on the display device. The touch display device of claim 1, wherein the consecutive even frame period is two front and rear frame periods. The touch display device according to any one of claims 1 to 8, wherein the display device is a liquid crystal display device. A driving method of a touch display device, comprising: an AC driven display device and a touch sensor for periodically reading touch information of the input interface, the driving method comprising: a touch information detecting step, The touch period of the touch sensor is synchronized with the frame period of the display device to detect the touch information of each frame period; and the touch information calculation step is performed for a continuous even number of the frame periods Calculating the average of the touch information, and obtaining a touch information statistical value, wherein the reading action is an operation of reading the touch information of the input interface in a plurality of cycles during a frame period, and the touch information is detected. In the step of detecting, the plurality of touch information of each frame is detected. In the touch information calculation step, the touch information detected in the same order is calculated for the plurality of touch information detected by each frame period. The average of the information. The method for driving a touch display device according to claim 10, wherein the touch information statistics value is an average of the touch information. The driving method of the touch display device according to claim 10, wherein the reading operation is an operation of scanning the electrodes arranged in a matrix configuration for detecting the touch information one by one. The method of driving a touch display device according to claim 10, wherein the touch sensor is an electrostatic capacitive touch sensor. The driving method of the touch display device according to claim 10, wherein the consecutive even frame period is two front and rear frame periods. A recording medium, which can be read by a computer, and which is programmed to implement a driving method of the touch display device according to any one of claims 10 to 14. A touch information acquisition program for implementing the driving method of the touch display device according to any one of claims 10 to 14.