TWI620113B - Touch sensing method and capacitive touch display device - Google Patents

Abstract

A touch sensing method is implemented by a processing module on a panel, and a first area and a second area of the panel each include a plurality of first pixel units and second pixel units. The method includes: sensing the capacitance values of all the first and second pixel units in the first half of an initial period to obtain a first reference data, and sensing the capacitance values again in the second half to obtain a second reference data; Sense the capacitance value in every odd sensing period after the cycle to obtain a sensing data and compare it with one of the first reference data and the second reference data, and after every The capacitance value is sensed in an even number of sensing cycles to obtain the sensed data and is compared with the other of the first reference data and the second reference data to generate multiple integrated difference data.

Description

Touch sensing method and capacitive touch display device

The invention relates to a touch sensing method, in particular to a touch sensing method related to a touch display panel. The invention also relates to a capacitive touch display device applying the touch sensing method.

In recent years, the technology of touch and display driver integration chips (English for Touch and Display Driver Integration, TDDI for short) has matured, and it has begun to be widely used in electronic products with touch display panels.

For an existing touch and display driver integrated chip, its main functions have two points: First, it drives each pixel of the touch display panel to display the correct color, thereby making the entire touch display panel display correct and complete The second is to sense whether the touch display panel is subjected to touch operation and send the sensing result to a central processing unit of the electronic product.

Referring to FIG. 1, the following uses an existing capacitive touch display panel 50 and a processing module 9 including an integrated chip for touch and display driving as an example to illustrate how the processing module 9 is in the prior art The capacitive touch display panel 50 is driven for display and touch sensing.

First, the capacitive touch display panel 50 will be described. Referring to FIG. 2, the capacitive touch display panel 50 can be applied to a smart phone, for example, and its resolution is, for example, 1440 times 900. That is to say, the capacitive touch display panel 50 includes a total of 1296000 pixels (not shown), and the pixels are arranged in 1440 columns and 900 rows. To avoid confusion, it is specifically defined in this patent specification that "column" stands for landscape and "row" stands for portrait.

The capacitive touch display panel 50 includes a first area A1 and a second area A2 having the same shape and size as the first area A1. Specifically, the first area A1 is the upper half of the capacitive touch display panel 50, and the second area A2 is the lower half of the capacitive touch display panel 50.

The first area A1 includes a plurality of first pixel units P1 arranged in a matrix, and the second area A2 includes a plurality of second pixel units P2 arranged in a matrix and having the same number as the first pixel units P1. Each first pixel unit P1 and each second pixel unit P2 each have many of the pixels.

More specifically, the first area A1 includes 270 first pixel units P1, and the second area A2 includes 270 second pixel units P2. The first pixel units P1 are arranged in a "15 columns by 18 rows" manner, and the second pixel units P2 are arranged in the same manner as the first pixel units P1. That is to say, the total number of columns of the first pixel units P1 and the second pixel units P2 is 30 columns. Each first pixel unit P1 and each second pixel unit P2 each have 2400 pixels, and the pixels of each first pixel unit P1 and each second pixel unit P2 are all multiplied by "48 columns" Arrange in 50 lines.

Next, the operation mode of the processing module 9 is divided into display driving and touch sensing.

In terms of display driving, the processing module 9 drives the capacitive touch display panel 50 to display images at a frequency of 60 Hz. In more detail, the processing module 9 drives the first pixel unit P1 and the second pixel sequentially in a row from top to bottom in each display period with a length of one sixtieth of a second Unit P2 displays the image.

In terms of touch sensing, the processing module 9 performs touch sensing on the capacitive touch display panel 50 at a frequency of 120 Hz. Overall, the processing module 9 first senses the capacitance values of the first pixel unit P1 and the second pixel unit P2 every one hundred and twenty-second seconds, and then the second and the second pixel units P2 The sensed capacitance values are compared with each other to calculate the amount of capacitance change between the first pixel unit P1 and the second pixel unit P2 before and after one hundred and twenty-second seconds to determine the Whether the capacitive touch display panel 50 is subjected to touch operation.

More specifically, the specific steps of the processing module 9 performing touch sensing on the capacitive touch display panel 50 are as follows:

Step 1: The processing module 9 senses the capacitance values of all the first pixel units P1 and the second pixel units P2 in an initial period with a length of one-twentieth to obtain a sum Reference material. The reference material includes a plurality of reference capacitance values corresponding to the positions of the first pixel unit P1 and the second pixel unit P2, respectively.

Step 2: The processing module 9 senses all the first pixel units P1 and the second pixels again in a sensing period with a length of one hundred and twenty-seconds after the initial period The capacitance value of the unit P2 is used to obtain a piece of sensing data, and the sensing data includes a plurality of sensing capacitance values corresponding to the positions of the first pixel unit P1 and the second pixel unit P2, respectively.

Step 3: The processing module 9 subtracts the corresponding sensing capacitance values from the corresponding reference capacitance values to obtain a piece of difference data. The difference data includes a plurality of difference capacitance values corresponding to positions of the first pixel unit P1 and the second pixel unit P2, respectively. The difference data indicates the amount of change in capacitance between the first pixel unit P1 and the second pixel unit P2 between the initial period and the sensing period. In particular, in the capacitive touch display panel In the case where 50 is not subjected to any touch operation, the ideal value of these differential capacitance values is zero.

Step 4: The processing module 9 determines whether the capacitive touch display panel 50 has been touched according to the difference data. Specifically, when the difference data indicates that the difference capacitance values of the adjacent ones of the first pixel unit P1 and the second pixel unit P2 exceed a threshold, the processing module 9 judges the The capacitive touch display panel 50 is subjected to touch operation.

Step 5: The processing module 9 uses the pen sensing data in step 3 as new reference data, and then executes from step 2 again.

In particular, in the initial cycle described in step one and the sensing cycle described in step two, the processing module 9 simultaneously performs capacitance values on the first area A1 and the second area A2 Sensing. Specifically, the processing module 9 includes a total of nine capacitance value sensing in the initial period or the sensing period. The first capacitance value sensing of the processing module 9 is performed on the first row and the tenth row of the first pixel units P1 and the first row and the tenth row of the second pixel units P2. The second capacitance value sensing of the processing module 9 is performed on the second row and the eleventh row of the first pixel units P1 and the second row and the eleventh row of the second pixel units P2 . By analogy, the ninth (that is, the initial period or the last time in the sensing period) capacitance value sensing of the processing module 9 refers to the ninth row and the first row of the first pixel units P1 18 rows, and the 9th and 18th rows of these second pixel units P2.

It should be emphasized that for the processing module 9, the display period and the sensing periods are performed simultaneously. Moreover, since the length of the display period (sixtieths of a second) is twice the length of the sensing period (one hundred and twenty-tenths of a second), a display period actually contains two Complete sensing cycle. That is to say, in the one-sixtieth of a single display cycle, the processing module 9 not only drives the capacitive touch display panel 50 to completely display the image, but also completes the capacitive touch twice The touch sensing performed by the display panel 50.

Taking the first half of a single display cycle as an example, the operation timing of the processing module 9 on the capacitive touch display panel 50 is summarized in Table 1 below. [Table I] Timing Acting type Action content 1 Display driver Driving the first column of the first pixel units P1 to display images 2 Touch sensing Capacitance sensing of the first and tenth rows of the first pixel units P1 and the first and tenth rows of the second pixel units P2 3 Display driver Driving the second column of the first pixel units P1 to display images 4 Touch sensing Capacitance sensing of the second and eleventh rows of the first pixel units P1 and the second and eleventh rows of the second pixel units P2 5 Display driver Drive the third column of the first pixel unit P1 to display images 6 Touch sensing Capacitance sensing is performed on the third row and the twelfth row of the first pixel units P1 and the third row and the twelfth row of the second pixel units P2 7 Display driver Driving the fourth column of the first pixel units P1 to display images 8 Touch sensing Capacitance sensing is performed on the 4th and 13th rows of the first pixel units P1 and the 4th and 13th rows of the second pixel units P2 9 Display driver Driving the fifth column of the first pixel units P1 to display images 10 Touch sensing Capacitance sensing is performed on the 5th and 14th rows of the first pixel units P1 and the 5th and 14th rows of the second pixel units P2 ... ... ... twenty four Display driver Driving the fifteenth column of the first pixel unit P1 to display images

In the second half of the single display cycle, the operation timing of the processing module 9 on the capacitive touch display panel 50 is similar. The difference from Table 1 is only that the processing module 9 is The second pixel units P2 are driven to display images.

Next, the points to be improved in the prior art will be described below.

Refer to Figures 1 and 3 at the same time, and refer to Table 1 above. Due to the electrical characteristics of the pixels, when the pixels are driven by the processing module 9 to display images, their pixel capacitance values will increase. Therefore, in timing 1, when the processing module 9 drives the first column of the first pixel units P1 (as indicated by the arrow t1 in FIG. 3) to display an image, it causes the The capacitance value of the first pixel unit P1 rises. Then, in timing 2, the processing module 9 compares the first row and the tenth row of the first pixel units P1 and the first row and the tenth row of the second pixel units P2 (as shown in FIG. 3 Where indicated by the two arrows t2) for capacitance value sensing. However, since the first column of the first pixel units P1 is still driven by the processing module 9 in the timing sequence 2, the capacitance value is still in the rising state. Therefore, in the timing sequence 2, the processing module 9 senses a higher capacitance value for two of the first pixel units P1 * shown in FIG. 3.

In the first half of the single display cycle, the processing module 9 performed nine times of capacitance value sensing on the capacitive touch display panel 50, and the similar situations of the foregoing sequence 1 to sequence 2 would be repeated, This affects the processing module 9 to sense the capacitance of the first pixel units P1. In the second half of the single display cycle, since the processing module 9 drives the second pixel units P2 to display images, the similar situation of the foregoing timing 1 to timing 2 will also affect the processing module 9 The capacitance value of the second pixel units P2 is sensed.

As indicated by the gray scale in FIG. 4, in a single complete display period, the portions of the first pixel unit P1 and the second pixel units P2 whose capacitance values are higher due to the aforementioned reasons will be generally oblique distributed. The first pixel unit P1 and the second pixel unit P2 with high capacitance values cause the processing module 9 to generate part of these differential capacitance values with high values in the foregoing step three. When the capacitive touch display panel 50 is not touched, the smaller the differential capacitance value, the better. Therefore, the higher partial differential capacitance value is equivalent to noise, which is not conducive to the processing mode The determination of group 9 in the foregoing step 4 also causes the signal-to-noise ratio (SNR or S / N) of the processing module 9 itself to decrease. Therefore, the existing technology still needs to be improved.

Therefore, one of the objects of the present invention is to provide a touch sensing method capable of overcoming noise caused by display driving.

Therefore, the touch sensing method of the present invention is implemented by a processing module to a capacitive touch display panel electrically connected to the processing module, the capacitive touch display panel includes a first area, and a first The area has a second area of the same shape and size, the first area includes a plurality of first pixel units arranged in a matrix, the second area includes a plurality of matrix arrangement, and the number is the same as that of the first pixel units The second pixel unit, each first pixel unit and each second pixel unit each have a plurality of pixels arranged in a matrix; the touch sensing method includes the following steps: (A) the processing module precedes an initial cycle Driving the first area to display images in the first half of the image, and sensing the capacitance values of all the first pixel units and the second pixel units to obtain a first reference data, and then driving in the second half of the initial cycle The second area displays an image, and again senses the capacitance values of all the first pixel units and the second pixel units to obtain a second reference data; (B) the processing module during the initial period In each of the multiple sensing periods of, the capacitance values of all the first pixel units and the second pixel units are sensed again to obtain multiple pieces of sensing data respectively corresponding to the sensing periods, and The processing module drives the first area to display images every odd number of sensing periods after the initial period, and drives the second area to display images every even number of sensing periods after the initial period; And (C) the processing module uses the first reference data as a target reference data every odd number of sensing cycles after the initial cycle, and the processing module uses every even number of sensors after the initial cycle In the measurement cycle, the second reference data is used as the target reference data, and the processing module compares the sensed data with the target reference data in each sensing cycle to generate an integrated difference data, and The processing module determines whether the capacitive touch display panel is operated according to the integrated difference data.

In some implementation aspects of the touch sensing method of the present invention, in step (A), the first reference material and the second reference material each include a plurality of first corresponding to the positions of the first pixel units, respectively The reference capacitance value, and a plurality of second reference capacitance values respectively corresponding to the positions of the second pixel units. In step (B), each sensing data includes a plurality of first sensing capacitance values respectively corresponding to the positions of the first pixel units, and a plurality of second sensing respectively corresponding to the positions of the second pixel units Measure the capacitance value.

In some implementation aspects of the touch sensing method of the present invention, in step (C), the integrated difference data includes a plurality of first difference capacitance values respectively corresponding to the first sensing capacitance values, and a plurality of respective The second difference capacitance value corresponding to the second sensing capacitance values, the method for the processing module to generate the integrated difference data includes calculating each of the first sensing capacitance values and corresponding one of the first reference capacitance values The amount of change between to obtain the first difference capacitance values, and to calculate the amount of change between each of the second sense capacitance values and the corresponding one of the second reference capacitance values to obtain the second Differential capacitance value.

Another object of the present invention is to provide a capacitive touch display device to which the touch sensing method can be applied.

The capacitive touch display device of the present invention includes a processing module and a capacitive touch display panel. The capacitive touch display panel is electrically connected to the processing module, and includes a first area and a second area having the same shape and size as the first area, the first area has a plurality of arranged in a matrix The first pixel unit, the second area has a plurality of second pixel units arranged in a matrix and the same number as the first pixel units, each first pixel unit and each second pixel unit each have a plurality of Array of pixels. The processing module first drives the first area to display images in the first half of an initial period, and senses the capacitance values of all the first pixel units and the second pixel units to obtain a first reference data, and then In the second half of the initial period, the second area is driven to display an image, and the capacitance values of all the first pixel units and the second pixel units are again sensed to obtain a second reference data. The processing module again senses the capacitance values of all the first pixel units and the second pixel units in each of the multiple sensing periods after the initial period, to obtain multiple strokes corresponding to the respective Sensing data in a sensing period, and the processing module drives the first area to display an image in every odd sensing period after the initial period, and every even sensing period after the initial period Drive the second area to display the image. The processing module uses the first reference data as a target reference data in every odd sensing period after the initial cycle, and the processing module in every even sensing period after the initial cycle, Using the second reference data as the target reference data, the processing module compares the sensed data with the target reference data in each sensing cycle to generate an integrated difference data, and the processing module According to the integrated difference data, it is determined whether the capacitive touch display panel is operated.

In some implementation aspects of the capacitive touch display device of the present invention, the first reference data and the second reference data each include a plurality of first reference capacitance values respectively corresponding to the positions of the first pixel units, and A second reference capacitance value corresponding to the positions of the second pixel units respectively, each sensing data includes a plurality of first sensing capacitance values respectively corresponding to the positions of the first pixel units, and a plurality of respectively corresponding The second sensing capacitance value equals the position of the second pixel unit.

In some embodiments of the capacitive touch display device of the present invention, the integrated difference data includes a plurality of first difference capacitance values respectively corresponding to the first sensing capacitance values, and a plurality of corresponding second sensing senses respectively The second difference capacitance value of the measured capacitance value, and the method for the processing module to generate the integrated difference data includes calculating the amount of change between each of the first sensing capacitance values and the corresponding one of the first reference capacitance values, To obtain the first differential capacitance values, and calculate the amount of change between each of the second sensing capacitance values and the corresponding one of the second reference capacitance values to obtain the second differential capacitance values.

The effect of the present invention is that whether the touch sensing method is the odd-numbered sensing period or the even-numbered sensing period, the integrated difference data obtained will not generate noise due to display driving, which is beneficial The processing module determines whether the capacitive touch display panel is subjected to touch operation more accurately, and effectively improves the signal-to-noise ratio of the processing module itself, and completely overcomes the need to improve the prior art.

Referring to FIG. 5, an embodiment of the capacitive touch display device of the present invention includes a processing module 1 and a capacitive touch display panel 50 electrically connected to the processing module 1. The capacitive touch display device can be installed in various electronic products, such as mobile phones, cameras, computers, etc., but not limited to this. The processing module 1 includes a touch and display driver integrated chip (TDDI). Therefore, the processing module 1 can implement a touch sensing method of the present invention on the capacitive touch display panel 50 and an existing Display drive process.

The capacitive touch display panel 50 will be described below. In this embodiment, the resolution of the capacitive touch display panel 50 is, for example, 1440 times 900 pixels, but not limited thereto. That is to say, the capacitive touch display panel 50 includes a total of 1296000 pixels (not shown), and the pixels are arranged in 1440 columns and 900 rows. It should be noted that, in this embodiment, "column" stands for landscape, and "row" stands for portrait.

Referring to FIG. 6, the capacitive touch display panel 50 includes a first area A1 and a second area A2 having the same shape and size as the first area A1. Specifically, in this embodiment, the first area A1 is the upper half of the capacitive touch display panel 50, and the second area A2 is the lower half of the capacitive touch display panel 50, But not limited to this.

The first area A1 includes a plurality of first pixel units P1 arranged in a matrix, and the second area A2 includes a plurality of second pixel units P2 arranged in a matrix and having the same number as the first pixel units P1. Each first pixel unit P1 and each second pixel unit P2 each have many of the pixels.

Specifically, the first area A1 includes 270 first pixel units P1, and the second area A2 includes 270 second pixel units P2. In more detail, the first pixel units P1 are arranged in a "15 columns by 18 rows" manner, and the second pixel units P2 are arranged in the same manner as the first pixel units P1. That is to say, the total number of columns of the first pixel unit P1 and the second pixel unit P2 is thirty columns, and the fifteen columns in the upper half belong to the first pixel unit P1, and the lower half Fifteen columns belong to the second pixel units P2. Each first pixel unit P1 and each second pixel unit P2 each have 2400 pixels, and the pixels of each first pixel unit P1 and each second pixel unit P2 are all multiplied by "48 columns" Arrange in 50 lines, but not limited to this.

Next, the display driving process performed by the processing module 1 on the capacitive touch display panel 50 will be described.

In the display driving process, the processing module 1 drives the first pixel unit P1 and the second pixel unit P2 sequentially from top to bottom, one column at a time, in each continuous display period image. In this embodiment, the length of each display cycle is, for example, one-sixtieth of a second, but not limited to this. In other words, the processing module 1 drives the capacitive touch display at a frequency of 60 Hz The panel 50 displays images.

It is added that since the total number of columns of the first pixel unit P1 and the second pixel unit P2 is thirty, each display period includes, for example, thirty display elements arranged at intervals from each other In each display sub-cycle, the processing module 1 drives the corresponding one of the first pixel units P1 or one of the second pixel units P2 to display the image.

In addition, when the processing module 1 drives each column of the first pixel unit P1 or the second pixel unit P2 to display an image, it may, for example, simultaneously drive all pixels included in the first pixel unit P1 or the second pixel unit P2 Display images, or the processing module 1 may sequentially drive the first pixel unit P1 or the second pixel unit P2 in a row from top to bottom in the display sub-period The 48 columns of pixels display images, but not limited to this.

Referring to FIGS. 5 to 7 at the same time, the following describes the touch sensing method of this embodiment in combination with the aforementioned display driving process.

First, step S1 is executed. The processing module 1 senses the capacitance values of all the first pixel units P1 and the second pixel units P2 in the first half of an initial period to obtain a first reference data. Then, in the second half of the initial cycle, the processing module 1 again senses the capacitance values of all the first pixel units P1 and the second pixel units P2 to obtain a second reference data. The first reference data and the second reference data each include a plurality of first reference capacitance values respectively corresponding to the positions of the first pixel units P1, and a plurality of second reference capacitances respectively corresponding to the positions of the second pixel units P2 Reference capacitance value.

It should be noted that in this embodiment, the initial cycle is equivalent to the first display cycle in the display driving process, that is to say, in the initial cycle, the processing module 1 except for all such first The pixel unit P1 and the second pixel units P2 not only perform capacitance sensing twice, but also drive the first area A1 and the second area A2 of the capacitive touch display panel 50 to display images.

For convenience of description, the first half of the initial period (that is, the first one hundred and twenty-second seconds of the first display period) is defined as a first sampling period, and the second half of the initial period (that is, The last one hundred and twenty-second seconds of the first display period is a second sampling period.

In terms of display driving, in the first sampling period, the processing module 1 only drives the first pixel units P1 (ie, the first area A1) to display images, therefore, the first pixel units P1 When each column is driven by the display, its capacitance value will temporarily increase, resulting in unnecessary noise. In the second sampling period, the processing module 1 only drives the second pixel units P2 (that is, the second area A2) to display images. Similarly, each column of the second pixel units P2 is receiving When the display is driven, its capacitance value will temporarily increase, resulting in unnecessary noise.

In terms of capacitance sensing, in this embodiment, the processing module 1 will sense all the first pixel units P1 and the second pixel units P2 during the first sampling period Capacitance value to get the first reference of the pen. Then, in the second sampling period, the processing module 1 again senses the capacitance values of all the first pixel units P1 and the second pixel units P2 to obtain the second reference data.

Moreover, in the first sampling period and the second sampling period, the processing module 1 alternately performs "display driving of the capacitive touch display panel 50", and "the first pixel units P1 and the Wait for the capacitance value sensing of the second pixel unit P2. " For ease of understanding, taking the first sampling period as an example, the timing of the processing module 1 performing display driving and capacitance sensing on the capacitive touch display panel 50 is shown in Table 2 below. [Table II] Timing Acting type Action content 1 Display driver Drive the first column of the first pixel units P1P1 to display images 2 Capacitance sensing Capacitance sensing for the first row and the tenth row of the first pixel units P1P1 and the first row and the tenth row of the second pixel units P2P2 3 Display driver Driving the second column of the first pixel units P1P1 to display images 4 Touch sensing Capacitance sensing for the second and eleventh rows of the first pixel units P1P1 and the second and eleventh rows of the second pixel units P2P2 5 Display driver Driving the third column of the first pixel units P1P1 to display images 6 Touch sensing Capacitance sensing is performed on the 3rd and 12th rows of the first pixel units P1P1 and the 3rd and 12th rows of the second pixel units P2P2 7 Display driver Driving the fourth column of the first pixel units P1P1 to display images 8 Touch sensing Capacitance sensing is performed on the 4th and 13th rows of the first pixel units P1P1 and the 4th and 13th rows of the second pixel units P2P2 9 Display driver Driving the fifth column of the first pixel units P1P1 to display images 10 Touch sensing Capacitance sensing is performed on the 5th and 14th rows of the first pixel units P1P1 and the 5th and 14th rows of the second pixel units P2P2 ... ... ... twenty four Display driver Driving the fifteenth column of the first pixel units P1P1 to display images

In the second sampling period, the operation timing of the processing module 1 on the capacitive touch display panel 50 is similar to the first sampling period, the only difference is that in the second sampling period, the processing module 1 In terms of display driving, the second pixel units P2 are driven to display images.

As can be seen from the foregoing description, among the first reference capacitance values included in the first reference material, some of the first reference capacitance values are higher, and the higher portion of the first reference capacitance values, As shown in FIG. 8, they are arranged diagonally. Similarly, in the second reference capacitance values included in the second reference material, some of the second reference capacitance values are higher, and the higher part of the second reference capacitance The capacitance values are arranged diagonally as shown in FIG. 9.

After the processing module 1 obtains the first reference material and the second reference material, step S2 is executed.

For ease of understanding, after the initial period is defined here, a plurality of consecutive sensing periods are continued, and in this embodiment, the length of each sensing period is, for example, one-twentieth of a second, but Not limited to this.

In step S2, the processing module 1 senses the capacitance values of all the first pixel units P1 and the second pixel units P2 again in the first sensing period after the initial period to obtain a sum Sensing data corresponding to the first sensing period, the pen sensing data includes a plurality of first sensing capacitance values respectively corresponding to the positions of the first pixel units P1, and a plurality of respectively corresponding to the second The second sensing capacitance value of the position of the pixel unit P2. At the same time, the processing module 1 also drives the first pixel units P1 (ie, the first area A1) to display images during the first sensing period. The processing module 1 drives the first pixel units P1 to display images in the first sensing period, and the timing of sensing the capacitance values of the first pixel units P1 and the second pixel units P2 is similar As mentioned in Table 2 above, it will not be repeated here.

Therefore, it is expected that part of the first sensing capacitance values included in the pen sensing data will be higher because the first pixel units P1 are driven by the display. Moreover, the first pixel units P1 corresponding to the high first sensing capacitance values are the first pixels corresponding to the high first reference capacitance values in the first reference data The pixel unit P1 is the same. Then, step S3 is executed.

In step S3, the processing module 1 uses the first reference data as a target reference data in the first sensing cycle, and compares the sensed data with the target reference data to generate a Integrate difference data. The integrated difference data includes a plurality of first difference capacitance values respectively corresponding to the first sensing capacitance values, and a plurality of second difference capacitance values respectively corresponding to the second sensing capacitance values, each first difference capacitance The value and the second difference capacitance value indicate the corresponding capacitance changes between one of the first pixel units P1 and one of the second pixel units P2 between the initial period and the first sensing period. In particular, when the capacitive touch display panel 50 is not subjected to any touch operation, the capacitance values of the first pixel units P1 and the second pixel units P2 should remain unchanged, that is to say When the capacitive touch display panel 50 is not subjected to touch operation, the ideal values of the first differential capacitance values and the second differential capacitance values are zero.

The integrated difference data is used by the processing module 1 to determine whether the capacitive touch display panel 50 has been operated, more specifically, when the integrated difference data indicates the first pixel units P1 and / or the first In the two pixel units P2, when the first difference capacitance value and / or the second difference capacitance value corresponding to the parts adjacent to each other exceed a threshold, the processing module 1 determines the capacitive touch display panel 50 subject to touch operation.

In this embodiment, the method for the processing module 1 to generate the integrated difference data includes calculating the amount of change between each of the first sensing capacitance values and the corresponding one of the first reference capacitance values (that is, each other The corresponding one of the first sensing capacitance values and one of the first reference capacitance values are subtracted to obtain an absolute value) to obtain the first difference capacitance values, and to calculate each of the second sensing capacitance values and the corresponding The amount of change between one of the second reference capacitance values (that is, the second one of the second sensing capacitance values corresponding to each other and one of the second reference capacitance values are subtracted to take the absolute value) to obtain the second differences Capacitance value. It is worth noting that in the process of calculating the first differential capacitance values, the high first sense capacitance values will be subtracted from the high first reference capacitance values, that is, the The equally high first sensing capacitance value and the relatively high first reference capacitance value will cancel each other out, therefore, in the integrated difference data, the first difference capacitance value will not be biased due to display driving high.

Then, step S4 is executed.

In step S4, the processing module 1 senses the capacitances of all the first pixel units P1 and the second pixel units P2 again in the second sensing period after the first sensing period Value to obtain the latest piece of sensing data corresponding to the second sensing period. Similarly, the latest pen sensing data includes the latest multiple first sense capacitance values and multiple second sense capacitance values. At the same time, the processing module 1 also drives the second pixel units P2 (ie, the second area A2) to display images during the second sensing period. The processing module 1 drives the second pixel units P2 to display images during the second sensing period, and the timing of sensing the capacitance values of the first pixel units P1 and the second pixel units P2 is similar to The aforementioned Table 2 will not be repeated here. In this step, part of the second sensing capacitance values included in the latest sensing data of the pen will be higher because the second pixel units P2 are driven by the display. Moreover, the second pixel units P2 corresponding to the higher second sensing capacitance values are the second corresponding to the second reference capacitance values corresponding to the higher second reference capacitance values in the second reference data The pixel unit P2 is the same. Then, step S5 is executed.

In step S5, in the second sensing cycle, the processing module 1 changes the second reference data to the target reference data, and compares the sensed data with the target reference data to generate Another latest integrated difference data. The latest integrated difference data includes the latest multiple first differential capacitance values and multiple second differential capacitance values.

Similarly, in the process of calculating the second difference capacitance values in this step, the high second sense capacitance values are respectively subtracted from the high second reference capacitance values, so the high The second sensing capacitance value and the higher second reference capacitance value cancel each other, therefore, in the latest integrated difference data of the pen, the second difference capacitance value will not be biased due to display driving high.

In the following more sensing cycles, the processing module 1 repeatedly executes steps S2 to S5, so it will not be repeated here.

The key point of this embodiment is that the processing module 1 compares the first reference data as the target reference data with the latest sensed data every odd number of sensing cycles after the initial cycle. In each even-numbered sensing period after the initial period, the processing module 1 compares the second reference data as the target reference data with the latest sensing data. In this way, no matter the odd-numbered sensing period or the even-numbered sensing period, the obtained integrated difference data will not generate noise due to display driving.

It is added that if in step S1 of another embodiment, the processing module 1 drives the second pixel units P2 to display images during the first sampling period, and drives the first pixel during the second sampling period A pixel unit P1 displays an image, after step S1, the processing module 1 corresponds to the second reference data as the target reference data every odd number of sensing cycles after the initial cycle, and after the initial cycle The first reference material is used as the target reference material every even sensing period after the cycle. That is to say, as long as the sensed data and the target reference data have higher capacitance values that can cancel each other, it can be implemented, and is not limited to this embodiment.

In summary, no matter whether it is the odd-numbered sensing period or the even-numbered sensing period, the integrated difference data obtained by the touch sensing method of the present invention will not generate noise due to display driving (that is, pixel capacitance Value temporarily), which is beneficial to the processing module 1 to more accurately determine whether the capacitive touch display panel 50 is subjected to touch operation, and effectively improves the signal-to-noise ratio of the processing module 1 itself, and completely Overcoming the need to improve the prior art, it can indeed achieve the purpose of cost invention.

However, the above are only examples of the present invention, and should not be used to limit the scope of implementation of the present invention, any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the patent specification are still considered as Within the scope of the invention patent.

9‧‧‧Processing module

1‧‧‧Processing module

50‧‧‧Capacitive touch display panel

A1‧‧‧The first area

A2‧‧‧Second area

P1‧‧‧The first pixel unit

P1 * ‧‧‧The first pixel unit

P2‧‧‧Second pixel unit

S1 ~ S5‧‧‧Step

Other features and functions of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: FIG. 1 is a block diagram illustrating a processing module and a capacitive touch display panel in the prior art FIG. 2 is a schematic diagram illustrating the existing capacitive touch display panel; FIG. 3 is a schematic diagram illustrating how the existing processing module alternately performs display driving and capacitance values on the capacitive touch display panel Sensing; FIG. 4 is a schematic diagram illustrating the distribution of noise generated by the existing processing module when sensing the capacitance of the capacitive touch display panel; FIG. 5 is a block diagram illustrating An embodiment of the capacitive touch display device of the present invention is shown. FIG. 6 is a schematic diagram illustrating the capacitive touch display panel. FIG. 7 is a flowchart illustrating how the embodiment implements a touch sensing. Method; FIG. 8 is a schematic diagram exemplifying that in this embodiment, a part of the plurality of first reference capacitance values included in a first reference material is higher; and FIG. 9 is a schematic diagram, exemplarily In the next embodiment, the second sum of the reference profile contains a plurality of portions by a second high reference capacitance values.

Claims (6)

A touch sensing method is implemented by a processing module to a capacitive touch display panel electrically connected to the processing module, the capacitive touch display panel includes a first area, and a A second area of the same shape and size, the first area includes a plurality of first pixel units arranged in a matrix, the second area includes a plurality of first pixel units arranged in a matrix, and the number is the same as the second number of the first pixel units A pixel unit, each first pixel unit and each second pixel unit each have a plurality of pixels arranged in a matrix; the touch sensing method includes the following steps: (A) the processing module precedes the first half of an initial cycle Drive the first area to display an image in the segment, and sense the capacitance values of all the first pixel units and the second pixel units to obtain a first reference data, and then drive the first region in the second half of the initial period The two areas display images, and again sense the capacitance values of all the first pixel units and the second pixel units to obtain a second reference data; (B) the processing module after the initial cycle In each of the sensing periods, the capacitance values of all the first pixel units and the second pixel units are sensed again to obtain multiple pieces of sensing data respectively corresponding to the sensing periods, and the processing mode The group drives the first area to display images every odd number of sensing periods after the initial period, and drives the second area to display images every even number of sensing periods after the initial period; and (C ) The processing module uses the first reference data as a target reference data in every odd number of sensing cycles after the initial cycle, and the processing module in every even number of sensing cycles after the initial cycle , Use the second reference data as the target reference data, and the processing module compares the sensed data with the target reference data in each sensing cycle to generate an integrated difference data, and the processing module The team determines whether the capacitive touch display panel is operated based on the integrated difference data. The touch sensing method according to claim 1, wherein: in step (A), the first reference material and the second reference material each include a plurality of first corresponding to the positions of the first pixel units respectively A reference capacitance value and a plurality of second reference capacitance values respectively corresponding to the positions of the second pixel units; and in step (B), each sensing data includes a plurality of positions corresponding to the first pixel units respectively A first sensing capacitance value of, and a plurality of second sensing capacitance values respectively corresponding to the positions of the second pixel units. The touch sensing method according to claim 2, wherein in step (C), the integrated difference data includes a plurality of first difference capacitance values respectively corresponding to the first sensing capacitance values, and a plurality of respective The second difference capacitance value corresponding to the second sensing capacitance values, the method for the processing module to generate the integrated difference data includes calculating each of the first sensing capacitance values and corresponding one of the first reference capacitance values The amount of change between to obtain the first difference capacitance values, and to calculate the amount of change between each of the second sense capacitance values and the corresponding one of the second reference capacitance values to obtain the second Differential capacitance value. A capacitive touch display device includes: a processing module; and a capacitive touch display panel, electrically connected to the processing module, and includes a first area, and a shape having the same shape as the first area and A second area of the same size, the first area has a plurality of first pixel units arranged in a matrix, the second area has a plurality of second pixel units arranged in a matrix and the same number as the first pixel units, each A first pixel unit and each second pixel unit each have a plurality of pixels arranged in a matrix; wherein, the processing module drives the first area to display images in the first half of an initial period, and senses all the Wait for the capacitance values of the first pixel unit and the second pixel units to obtain a first reference data, and then drive the second area to display images in the second half of the initial period, and then sense all the first pixels again Units and the capacitance values of the second pixel units to obtain a second reference data, the processing module again senses all of the multiple sensing periods after the initial period Wait for the capacitance values of the first pixel unit and the second pixel units to obtain multiple pieces of sensing data corresponding to the sensing periods respectively, and the processing module is for every odd number of sensings after the initial period Driving the first area to display images in a cycle, and driving the second area to display images in every even-numbered sensing cycles after the initial cycle, and the processing module every odd-numbered sensing cycles after the initial cycle In the process, the first reference data is used as a target reference data, and the processing module uses the second reference data as the target reference data in every even-numbered sensing cycles after the initial cycle. In each sensing period, the sensing data is compared with the target reference data to generate an integrated difference data, and the processing module determines whether the capacitive touch display panel is operated according to the integrated difference data. The capacitive touch display device according to claim 4, wherein the first reference data and the second reference data each include a plurality of first reference capacitance values corresponding to the positions of the first pixel units, respectively A second reference capacitance value corresponding to the positions of the second pixel units respectively, each sensing data includes a plurality of first sensing capacitance values respectively corresponding to the positions of the first pixel units, and a plurality of respectively corresponding The second sensing capacitance value equals the position of the second pixel unit. The capacitive touch display device according to claim 4, wherein the integrated difference data includes a plurality of first difference capacitance values respectively corresponding to the first sensing capacitance values, and a plurality of corresponding second sense sensors respectively The second difference capacitance value of the measured capacitance value, and the method for the processing module to generate the integrated difference data includes calculating the amount of change between each of the first sensing capacitance values and the corresponding one of the first reference capacitance values, To obtain the first differential capacitance values, and calculate the amount of change between each of the second sensing capacitance values and the corresponding one of the second reference capacitance values to obtain the second differential capacitance values.