CN111078054B - Touch detection device, control method thereof and display module - Google Patents

Abstract

Embodiments of the present invention provide a touch detection device, a control method thereof, and a display module, which relate to the field of display technology and can improve the test efficiency of a touch display panel. A touch detection device, comprising: a touch detection circuit provides a first voltage signal and a modulation signal to some touch electrode blocks in a plurality of touch electrode blocks at a preset time, as a first touch electrode block, and provides a first voltage signal to a plurality of touch electrode blocks. The rest of the touch electrode blocks in the first touch electrode block provide the second voltage signal and modulation signal as the second touch electrode block, and obtain the feedback signal of each touch electrode block; the voltage of the second voltage signal is lower than that of the first touch electrode block. The voltage of the voltage signal; the processor compares the received feedback signal of the touch detection circuit with the preset value to obtain the variation of the first touch electrode block and the second touch electrode block respectively; and performs interpolation fitting to judge Whether the trend of the fitting curve matches the positions of the first touch electrode block and the second touch electrode block.

Description

Touch detection device, control method thereof, and display module

technical field

The present invention relates to the field of display technology, in particular to a touch detection device, a control method thereof, and a display module.

Background technique

At present, touch display panels have been widely used in display products such as mobile phones. Among them, FIC (Full in Cell, embedded) touch is compared with SLOC (Single Layer cn Cell, single-layer multi-point external embedded) touch , the common electrode block is reused as a touch electrode block, no special touch electrode is required, and the loss of the SLOC process is avoided. Among them, before the display products using the touch display panel are shipped, it is necessary to monitor the capacitance value of the self-capacitance of the touch electrode block and the short circuit and open circuit conditions, and test the touch display panel in order to track the touch display panel and its production in time. level of craftsmanship.

Contents of the invention

Embodiments of the present invention provide a touch detection device, a control method thereof, and a display module, which can improve the test efficiency of a touch display panel.

In order to achieve the above object, embodiments of the present invention adopt the following technical solutions:

In the first aspect, a touch detection device is provided, including: a touch detection circuit and a processor; the touch detection circuit is electrically connected to a plurality of touch electrode blocks arranged in an array in a touch display panel; The touch detection circuit is configured to provide a first voltage signal and a modulation signal to some of the plurality of touch electrode blocks at a preset time, and provide the first voltage signal and a modulation signal to the rest of the plurality of touch electrode blocks The touch electrode block provides the second voltage signal and the modulation signal, and obtains the feedback signal of each touch electrode block; wherein, the voltage of the second voltage signal is lower than the voltage of the first voltage signal; The touch electrode block of the first voltage signal is used as the first touch electrode block, and the touch electrode block receiving the second voltage signal is used as the second touch electrode block. All are the second touch electrode block; the processor is electrically connected to the touch detection circuit; the processor is configured to receive the feedback signal from the touch detection circuit, and Comparing the preset values to obtain the variation of the first touch electrode block and the second touch electrode block; and the variation of the first touch electrode block and the second touch electrode block, Perform interpolation fitting, and judge whether the trend of the fitting curve matches the positions of the first touch electrode block and the second touch electrode block.

Optionally, one frame includes M segments of the preset time, and M is a positive integer greater than 1; the touch detection circuit is configured to send a plurality of the first touch The electrode block provides the first voltage signal and the modulation signal, provides the second voltage signal and the modulation signal to a plurality of the second touch electrode blocks, and obtains the first touch electrode block and the second touch control A feedback signal of an electrode block; wherein, the touch detection circuit provides the first voltage signal to completely different first touch electrode blocks at different preset times.

Optionally, the touch detection circuit is configured to provide a first voltage signal and a modulation signal to some of the plurality of touch electrode blocks at a preset time, including: The row direction or the column direction of the arrangement of the control electrode blocks, the touch detection circuit is configured to provide a touch electrode block with the first voltage signal and the The modulation signal; wherein, 5≥N≥1.

Optionally, the processor is further configured to, according to the Kalman filter algorithm, combine the change amount of the touch electrode block detected at a preset time in the current frame with The average value and error of the change amount of the touch electrode block at the preset time, obtain the effective value of the change amount of the touch electrode block at the preset time in the current frame, and predict the preset time in the next frame. An interval of the change amount of the touch electrode block at the time is set, and it is determined whether the change amount of the touch electrode block detected at the preset time in the next frame is within the interval.

Optionally, the touch detection circuit includes a plurality of detection sub-circuits and a plurality of data selectors; one of the data selectors corresponds to and is electrically connected to a column of the touch electrode blocks; a plurality of the detection sub-circuits and The data selector is electrically connected; a plurality of the detection sub-circuits electrically connected to one data selector correspond to a column of the touch electrode blocks electrically connected to the data selector; the data selector The device is configured to electrically connect the detection sub-circuit to the touch electrode block corresponding to the detection sub-circuit; multiple touch electrode blocks in a row of touch electrode blocks communicate with the same through their corresponding data selectors. One of the detection sub-circuits is electrically connected; the detection sub-circuit is also electrically connected to the voltage signal input terminal, and the detection sub-circuit is configured to be electrically connected to the detection sub-circuit during the charging phase of the touch electrode block. The part of the touch electrode block provides the first voltage signal from the voltage signal input terminal, charges the part of the touch electrode block, and transmits the detected feedback signal of the part of the touch electrode block to the processor , and at different times, provide the second voltage signal from the voltage signal input terminal to the rest of the touch electrode blocks electrically connected to the detection sub-circuit, charge the rest of the touch electrode blocks, and use the detected Feedback signals of the rest of the touch electrode blocks are transmitted to the processor; during the discharge phase of the touch electrode blocks, the touch electrode blocks are grounded.

Optionally, the touch detection circuit further includes a modulation signal input subcircuit; the modulation signal input subcircuit is electrically connected to the modulation signal input terminal and the plurality of touch electrode blocks; the modulation signal input subcircuit is It is configured to transmit the modulation signal from the modulation signal input terminal to the touch electrode block during the charging phase of the touch electrode block.

Optionally, the detection subcircuit includes a first switch, a second switch, a first amplifier, a first capacitor, a third switch, a digital-to-analog converter, and a digital signal processor; the first end of the first switch Electrically connected to the negative input terminal of the first amplifier, the second terminal of the first switch is electrically connected to the data selector; the first terminal of the second switch is connected to the second terminal of the first switch Electrically connected, the second end of the second switch is grounded; the positive input end of the first amplifier is electrically connected to the voltage signal input end, and the output end of the first amplifier is connected to the input of the digital-to-analog converter Terminals are electrically connected; the output terminal of the digital-to-analog converter is electrically connected to the input terminal of the digital signal processor, and the output terminal of the digital signal processor is electrically connected to the processor; the first capacitance of the first capacitor One pole is electrically connected to the negative input end of the first amplifier, the second pole of the first capacitor is electrically connected to the output end of the first amplifier; the first end of the third switch is electrically connected to the first The output end of the amplifier is electrically connected, and the second end of the third switch is electrically connected to the negative input end of the first amplifier.

Optionally, the modulation signal input subcircuit includes a second amplifier and a fourth switch; the positive input terminal of the second amplifier is electrically connected to the modulation signal input terminal, and the negative input terminal of the second amplifier is connected to the output Both ends are electrically connected to the touch electrode block; the first end of the fourth switch is electrically connected to the touch electrode block, and the second end of the fourth switch is grounded.

Optionally, the detection sub-circuit further includes a second capacitor, a fifth switch, and a sixth switch; the first pole of the second capacitor is electrically connected to the negative input terminal of the first amplifier, and the second capacitor The second pole of the second pole is electrically connected to the first end of the fifth switch and the second end of the sixth switch; the second end of the fifth switch is grounded; the first end of the sixth switch is connected to the initialization voltage electrical connection.

In a second aspect, a display module is provided, including the above-mentioned touch detection device and a touch display panel; the touch display panel includes a plurality of touch electrode blocks arranged in an array and connected with the touch electrode A block of electrically connected touch electrode lines, the touch electrode lines are electrically connected to the touch detection device.

In a third aspect, a method for controlling a touch detection device as described above is provided, including: the touch detection circuit provides a first voltage signal and a modulation signal to some touch electrode blocks among the plurality of touch electrode blocks at a preset time , providing the second voltage signal and the modulation signal to the rest of the plurality of touch electrode blocks, and obtaining the feedback signal of each touch electrode block; wherein the voltage of the second voltage signal is less than The voltage of the first voltage signal; the touch electrode block receiving the first voltage signal is used as the first touch electrode block, and the touch electrode block receiving the second voltage signal is used as the second touch electrode block ; The processor compares the received feedback signal from the touch detection circuit with a preset value to obtain the variation of the first touch electrode block and the second touch electrode block; and The variation of the first touch electrode block and the second touch electrode block is interpolated and fitted, and the trend of the fitting curve is judged to be consistent with the first touch electrode block and the second touch electrode block The location of the match.

Optionally, one frame includes M segments of the preset time, and M is a positive integer greater than 1; the control method of the touch detection device further includes: the touch detection circuit is providing a first voltage signal and a modulation signal to a plurality of the first touch electrode blocks, providing a second voltage signal and the modulation signal to a plurality of the second touch electrode blocks, and obtaining the first touch control The feedback signal of the electrode block and the second touch electrode block; wherein, the touch detection circuit provides the first voltage to the completely different first touch electrode block at different preset times signal, providing the second voltage signal to the completely different second touch electrodes.

Optionally, the control method of the touch detection device further includes: according to the Kalman filter algorithm, the processor combines the change amount of the touch electrode block detected at the preset time in the current frame, and the The average value and error of the change amount of the touch electrode block at the preset time in all frames before the current frame, and obtain the effective value of the change amount of the touch electrode block at the preset time in the current frame , and predict the interval of the change amount of the touch electrode block at the preset time in the next frame, and determine whether the change amount of the touch electrode block detected at the preset time in the next frame is within the interval.

To sum up, the embodiments of the present invention provide a touch detection device, a control method thereof, and a display module. The touch detection device includes a touch detection circuit and a processor. The touch detection circuit is electrically connected to a plurality of touch electrode blocks arranged in an array in the touch display panel. The touch detection circuit is used to provide the first voltage signal and modulation signal to some of the touch electrode blocks in the plurality of touch electrode blocks at a preset time, and provide the first voltage signal and modulation signal to the rest of the touch electrode blocks in the plurality of touch electrode blocks. Two voltage signals and modulation signals, and obtain feedback signals of each touch electrode block. Wherein, the voltage of the second voltage signal is lower than the voltage of the first voltage signal. The touch electrode block receiving the second voltage signal is used as the first touch electrode block, and the touch electrode block receiving the second voltage signal is used as the second touch electrode block. The surrounding area of each first touch electrode block is The second touch electrode block. The processor is electrically connected with the touch detection circuit. The processor is used to compare the received feedback signal from the touch detection circuit with the preset value to obtain the variation of the first touch electrode block and the second touch electrode block, and compare the first touch electrode block and the second touch electrode block The change amount of the second touch electrode block is interpolated to determine whether the trend of the fitting curve matches the positions of the first touch electrode block and the second touch electrode block. On this basis, through interpolation fitting, according to whether the trend of the fitting curve matches the position of the touch electrode block, it is judged whether there is a short circuit or an open circuit between the touch electrode block and the wiring. When the trend of the fitting curve When an abnormality occurs and the position of the touch electrode block does not match, there is a short circuit or open circuit between the touch electrode block and the wiring. The difference in the feedback signal of the touch detection circuit is small. The abnormal point does not match the position of the touch electrode block, so as to accurately determine whether there is a weak short circuit or a weak open circuit between the touch electrode block and the wiring, and improve the test efficiency of the touch display panel. Moreover, when there is a specific area on the touch display panel, for example, the touch electrode block is missing at the edge of the touch display panel, the fitting curve in the missing area of the touch electrode block can be supplemented so that the fitting curve conforms to All the touch electrode blocks in the touch display panel conform to the uniform distribution to judge whether there is a short circuit or open circuit between the touch electrode blocks and the wiring, so as to avoid the deviation of the detection results due to the irregular arrangement of the touch electrode blocks and improve the touch control. Displays the accuracy of the panel test.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a schematic structural diagram of a display module provided by an embodiment of the present invention;

FIG. 2 is a schematic diagram of detection of a touch display panel at a preset time provided by an embodiment of the present invention;

FIG. 3 is another schematic diagram of detection of a touch display panel at a preset time provided by an embodiment of the present invention;

FIG. 4 is another schematic diagram of detection of a touch display panel at a preset time provided by an embodiment of the present invention;

FIG. 5 is another schematic diagram of detection of a touch display panel at a preset time provided by an embodiment of the present invention;

Fig. 6 is a schematic diagram of a fitting curve provided by an embodiment of the present invention;

FIG. 7 is a schematic diagram of another fitting curve provided by an embodiment of the present invention;

FIG. 8 is a schematic diagram of another fitting curve provided by an embodiment of the present invention;

Fig. 9 is a schematic diagram of another fitting curve provided by the embodiment of the present invention;

FIG. 10 is a schematic diagram of detection of a touch display panel provided by the prior art;

FIG. 11 is a schematic diagram of detection of another touch display panel provided by the prior art;

Fig. 12 is a schematic structural diagram of a display module provided by an embodiment of the present invention;

FIG. 13 is a schematic structural diagram of a touch detection circuit provided by an embodiment of the present invention;

FIG. 14 is a schematic structural diagram of a touch detection circuit provided by an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

An embodiment of the present invention provides a display module, including a touch detection device 10 and a touch display panel 20 .

For example, the touch display panel 20 is TDDI (Touch DisplayDriver Integration).

As shown in FIG. 1 , the touch display panel 20 includes a plurality of touch electrode blocks 201 arranged in an array and touch electrode lines Tx electrically connected to the touch electrode blocks 201 . The touch electrode lines Tx are electrically connected to the touch detection device 10 .

As shown in FIG. 1 , a plurality of touch electrode blocks 201 are arranged in an array of n rows and m columns. In this case, the touch electrode blocks 201 arranged in a row along the horizontal direction X are referred to as the same row of touch electrode blocks, and the touch electrode blocks 201 arranged in a row along the vertical direction Y are referred to as the same row of touch electrode blocks.

Wherein, one touch electrode block 201 is electrically connected to one touch electrode line Tx, and the touch electrode line Tx extends along the vertical direction Y. For example, the touch electrode blocks in the first row and the first column are electrically connected to a touch electrode line Tx(1-1), and the touch electrode blocks in the first row and the second column are connected to a touch electrode line Tx(1-2). ), the touch electrode block in the nth row and the mth column is electrically connected to a touch electrode line Tx(n-m).

On this basis, the display module further includes an integrated circuit (Integrated Circuit, IC for short), and the IC is electrically connected to the touch display panel 20 . The touch detection device 10 is located in the IC.

On this basis, an embodiment of the present invention provides a touch detection device. As shown in FIG. 1 , the touch detection device 10 includes a touch detection circuit 101 and a processor 102 .

The touch detection circuit 101 is electrically connected to a plurality of touch electrode blocks 201 arranged in an array in the touch display panel 20 . The processor 102 is electrically connected to the touch detection circuit 101 .

For example, the processor 102 may be an MCU (Microcontroller Unit, Microcontroller Unit) or a CPU (Central Processing Unit, Central Process Unit).

The touch detection circuit 101 is configured to provide the first voltage signal and the modulation signal to some of the touch electrode blocks in the plurality of touch electrode blocks at a preset time, and provide the first voltage signal and the modulation signal to the rest of the touch electrode blocks in the plurality of touch electrode blocks. the second voltage signal and the modulation signal, and obtain the feedback signal of each touch electrode block.

Wherein, the voltage of the second voltage signal is smaller than the voltage of the first voltage signal.

It should be noted that the modulation signal is a reference signal of the touch electrode block. When charging the self-capacitance of the touch electrode block according to the first voltage signal or the second voltage signal, the voltage of the self-capacitance of the touch electrode block is superimposed on the basis of the reference signal by the first voltage signal or the second voltage signal .

Exemplarily, the modulation signal may come from a common voltage signal of the touch display panel. The material of the touch electrode block is ITO (indium tin oxide).

In this case, as shown in FIG. 2, the touch electrode block receiving the first voltage signal is used as the first touch electrode block 2011, and the touch electrode block receiving the second voltage signal is used as the second touch electrode block 2012. .

Surrounding each first touch electrode block 2011 are second touch electrode blocks 2012 . Moreover, an additional capacitance is formed between the first touch electrode block 2011 and the second touch electrode block 2012 .

It should be noted that the surrounding area of each first touch electrode block 2011 is the second touch electrode block 2012, referring to the row direction (that is, the horizontal direction X in FIG. 2 ), except for the first column and the last column When a touch electrode block other than the touch electrode block is used as the first touch electrode block 2011, both sides of the first touch electrode block 2011 are second touch electrode blocks 2012; Vertical direction Y), when touch electrode blocks other than the first row and the last row of touch electrode blocks are used as the first touch electrode block 2011, both sides of the first touch electrode block 2011 are the second touch electrode blocks. Electrode block 2012. In addition, as shown in FIG. 2 , along the diagonal direction of the first touch electrode block 2011 , the touch electrode block adjacent to the first touch electrode block 2011 is also the first touch electrode block 2011 In this case, the additional capacitance formed is relatively small, and the influence on the first touch electrode block 2011 can be ignored.

The processor 102 is configured to compare the received feedback signal from the touch detection circuit 101 with a preset value to obtain the variation of the first touch electrode block 2011 and the second touch electrode block 2012 respectively, and perform interpolation fitting, It is judged whether the trend of the fitting curve matches the positions of the first touch electrode block 2011 and the second touch electrode block 2012 .

Wherein, the preset value is the feedback signal of the touch electrode block 201 in the touch display panel 20 when no touch occurs. The touch electrode blocks in different touch display panels are different, and the corresponding preset values are also different.

It can be understood that the touch electrode block 201 forms a self-capacitance with the ground terminal. At a preset time, the touch detection circuit 101 inputs a first voltage signal to the first touch electrode block 2011 to charge the self-capacitance of the first touch electrode block 2011 until the self-capacitance of the first touch electrode block 2011 reaches The voltage is equal to the voltage of the first voltage signal, and at this time, the self-capacitance of the first touch electrode block 2011 is fully charged. The touch detection circuit 101 inputs the second voltage signal to the second touch electrode block 2012 to charge the self-capacitance of the second touch electrode block 2012 until the voltage of the self-capacitance of the second touch electrode block 2012 is equal to the second voltage The voltages of the signals are equal, and since the voltage of the second voltage signal is lower than the voltage of the first voltage signal, the self-capacitance of the second touch electrode block 2012 cannot be fully charged.

Since there is additional capacitance between the first touch electrode block 2011 and the second touch electrode block 2012, the second touch electrode block 2012 can be used to simulate the change in self-capacitance of the first touch electrode block 2011 when a finger touch occurs. Condition. When a finger touch occurs on the touch electrode block, the finger is equivalent to the ground, the self-capacitance of the touch electrode block increases, and the amount of charge required for the charging process increases. The charging process of the self-capacitance of the first touch electrode block 2011 The amount of charge required is increased compared to the amount of charge required for the charging process of the self-capacitance of the second touch electrode block 2012 .

It can be understood that when there is an open circuit between the touch electrode block 201 and the wiring due to the bonding process or the open circuit of the touch display panel 20, the self-capacitance of the touch electrode block 201 is too large, so that each touch The signal amount of the electrode block 201 will be significantly reduced, affecting the touch performance, and the touch display panel 20 is defective at this time. Moreover, due to the small distance between the traces of the touch display panel 20 (such as touch electrode lines or power lines, etc.), or the via holes used to electrically connect the touch electrode lines and touch electrode blocks appear undercut (undercut). ) phenomenon, making it easy for the touch electrode block 201 to be short-circuited with the adjacent touch electrode block 201 or the wiring.

On this basis, short circuit or open circuit detection is performed on the touch display panel 20 , and the touch detection circuit 101 obtains feedback signals from the first touch electrode block 2011 and the second touch electrode block 2012 respectively. Since the amount of charge charged during the self-capacitance charging process of the first touch electrode block 2011 is greater than the charge amount charged during the self-capacitance charging process of the second touch electrode block 2012, the first touch detection circuit 101 obtains The feedback signal of the touch electrode block 2011 is greater than the feedback signal of the second touch electrode block 2012 . In this case, the processor 102 compares the received feedback signals of the first touch electrode block 2011 and the second touch electrode block 2012 with preset values to obtain the first touch electrode block 2011 and the second touch electrode block 2011 and the second touch electrode block respectively. The change amount of the electrode block 2012. According to the change amount of the first touch electrode block 2011 and the change amount of the second touch electrode block 2012, interpolation fitting is performed to obtain a fitting curve. It is judged whether the trend of the fitting curve matches the positions of the first touch electrode block 2011 and the second touch electrode block 2012 . If the trend of the fitting curve basically matches the position of the first touch electrode block 2011 or the second touch electrode block 2012, at this time, the first touch electrode block or the second touch electrode block 2012 is in contact with the touch display panel. There is no short circuit or open circuit between the wires (such as the touch electrode wire Tx). If the trend of the fitting curve is abnormally matched with the position of the first touch electrode block 2011 or the second touch electrode block 2012, then the first touch electrode block 2011 or the second touch electrode block 2012 and the touch display panel There is a short circuit or a bad open circuit between the traces.

It can be understood that the fitting curve is a heat map drawn by the processor 102 according to the data size in the data matrix after the interpolation of the variation of each touch electrode block. If the touch electrode blocks and wires in the touch display panel 20 are short-circuited or disconnected, a certain point may bulge or sag on the heat map. The position distribution of the control electrode blocks does not match. If there is no short circuit or open circuit between each touch electrode block and the wiring in the touch display panel 20, the trend of the heat map is consistent with that of each touch electrode block in the touch display panel 20. The location distribution matches.

Wherein, the interpolation fitting may adopt a Gaussian interpolation method. Moreover, in the process of interpolation and fitting, actual conditions of the touch display panel 20 (such as boundary conditions, etc.) will be included in the calculation. On this basis, the processor 102 can map the data matrix formed by the variation of each touch electrode block in the touch display panel 20 into a larger matrix after Gaussian interpolation, for example, the original 10×10 After Gaussian interpolation, the data matrix will be mapped to a 30×30 data matrix, and the mapped data matrix will be used to describe the distribution and change of the fitting curve.

Moreover, when there is a weak short circuit or a weak open circuit in the touch display panel, the difference in the feedback signal of the touch detection circuit 101 is small. At this time, by fitting the curve, it can be clearly found that the trend of the fitting curve is in the touch electrode block. There is an abnormal point at the position, and it is judged whether there is a weak short circuit or a weak open circuit in the touch electrode block, thereby improving the detection accuracy of the touch display panel.

On this basis, for a touch display panel in which the touch electrode blocks are normally arranged according to a certain rule, after Gaussian interpolation at the position of the first touch electrode block 2011, the mapping fitting curve L1 (as shown in FIG. 6 ) is Gaussian. distribution, the midpoint of the Gaussian distribution curve is defined as the position of the judgment point, and the distribution of the judgment point at the position of the first touch electrode block 2011 in the touch display panel 20 is a curve L2 (as shown in FIG. Whether the position of the midpoint of the matching curve matches the position of the touch electrode block is used to determine whether there is a short circuit or an open circuit between the touch electrode block and the wiring. For special touch display panels, if the touch electrode block at the edge of the touch display panel is missing, the data at the position of the missing touch electrode block area cannot be detected, which will affect the area near the missing touch electrode block area. position of the judgment point, but after interpolation and fitting, the fitting curve at the area 202 of the missing touch electrode block can be completed (as shown in FIGS. 7-8 ), so that the missing touch electrode block The fitting curve around the area 202 still conforms to the Gaussian distribution. At this time, it can be judged whether there is a short circuit or a short circuit between the touch electrode block and the touch electrode line according to whether the position of the midpoint of the fitting curve matches the position of the touch electrode block. broken circuit. In addition, for the case where there are missing touch electrode blocks on both sides of the touch display panel (as shown in FIG. 9 ), the fitting curve at the area 202 where the touch electrode blocks are missing can also be completed to determine the touch electrode blocks. Whether there is a short circuit or an open circuit between the block and the touch electrode line, or, according to the touch effect of the actual touch display panel, consider ignoring the judgment point at the area of the missing touch electrode block.

To sum up, the embodiment of the present invention provides a touch detection device 10 including a touch detection circuit 101 and a processor 102 . The touch detection circuit 101 is electrically connected to a plurality of touch electrode blocks arranged in an array in the touch display panel 20 . The touch detection circuit 101 is configured to provide the first voltage signal and the modulation signal to some of the touch electrode blocks in the plurality of touch electrode blocks at a preset time, and provide the first voltage signal and the modulation signal to the rest of the touch electrode blocks in the plurality of touch electrode blocks. the second voltage signal and the modulation signal, and obtain the feedback signal of each touch electrode block. Wherein, the voltage of the second voltage signal is lower than the voltage of the first voltage signal. The touch electrode block 201 receiving the second voltage signal is used as the first touch electrode block 2011, and the touch electrode block 201 receiving the second voltage signal is used as the second touch electrode block 2012. Each first touch electrode block 2011 is surrounded by second touch electrode blocks 2012 . The processor 101 is electrically connected to the touch detection circuit 102 . The processor 101 is used to compare the received feedback signal from the touch detection circuit 102 with a preset value to obtain the variation of the first touch electrode block 2011 and the second touch electrode block 2012 respectively, and compare the first touch electrode block 2011 with the preset value. The variation of the control electrode block 2011 and the second touch electrode block 2012 is interpolated to determine whether the trend of the fitting curve matches the positions of the first touch electrode block 2011 and the second touch electrode block 2012 . On this basis, through interpolation fitting, according to whether the trend of the fitting curve matches the position of the touch electrode block 201, it is judged whether there is a short circuit or an open circuit between the touch electrode block 201 and the wiring. When the trend of the curve is abnormal and does not match the position of the touch electrode block 201, there is a short circuit or open circuit between the touch electrode block 201 and the wiring, and the difference in the feedback signal of the touch detection circuit 101 is small, which can Whether there is an abnormal point in the fitting curve does not match the position of the touch electrode block, so as to accurately determine whether there is a weak short circuit or a weak open circuit between the touch electrode block and the wiring, and improve the testing efficiency of the touch display panel 20 . Moreover, when there is a specific area on the touch display panel, for example, the touch electrode block 201 is missing at the edge of the touch display panel 20, the fitting curve of the missing area of the touch electrode block 201 can be supplemented to make the fitting curve The matching curve conforms to the fact that all the touch electrode blocks 201 in the touch display panel 20 are uniformly distributed, so as to determine whether there is a short circuit or an open circuit between the touch electrode blocks 201 and the wiring, so as to avoid detection due to the irregular arrangement of the touch electrode blocks 201 Deviations occur in the results, which improves the accuracy of the touch display panel 20 test.

On this basis, in some embodiments of the present invention, one frame includes M preset time periods, where M is a positive integer greater than 1.

The touch detection circuit 101 is used to provide the first voltage signal and modulation signal to the plurality of first touch electrode blocks 2011, and provide the second voltage signal and modulation signal to the plurality of second touch electrode blocks 2012 at each preset time period. signal, and obtain feedback signals from the first touch electrode block 2011 and the second touch electrode block 2012 .

Wherein, the touch detection circuit 101 provides the first voltage signal to completely different first touch electrode blocks 2011 at different preset times.

Exemplarily, the duration of one frame is at least the duration of one displayed image frame.

It can be understood that the first touch electrode block at the M-1 preset time is completely different from the first touch electrode block at the M preset time. Moreover, in one frame, one touch electrode block in the touch display panel 20 will serve as the first touch electrode block 2011 for a predetermined period of time, and serve as the second touch electrode block for the rest of the predetermined period of time. 2012.

Compared with the touch display panel 20 in which the touch electrode blocks 201 are arranged in an array of n rows and m columns, for example, n=32, m=18, all touch electrode blocks are performed row by row (as shown in FIG. 10 ). Column (shown in Figure 11) detection. As shown in FIG. 10 , from the first row to the last row of touch electrode blocks at a preset time, a row of touch electrode blocks is used as the first touch electrode block 2011 in sequence, and two adjacent rows of touch electrode blocks in the row of touch electrode blocks are The control electrode block is used as the second touch electrode block 2012 to increase the self-capacitance of the row of touch electrode blocks. In this case, the self-capacitance of the first touch electrode block 2011 is charged to a saturated state, and the capacitance value of the first touch electrode block 2011 is detected. If the capacitance value of the first touch electrode block 2011 decreases, the row There is an open circuit in the touch electrode block, and if the detected voltage of the second touch electrode block 2012 is converted into resistance and the resistance is less than or equal to a standard value, then there is a short circuit in the row of touch electrode blocks. Similarly, as shown in FIG. 11 , from the first row to the last row of touch electrode blocks at a preset time, a row of touch electrode blocks is sequentially used as the first touch electrode block 2011 for detection. After the detection of the touch electrode blocks of the touch display panel is completed, the detection times=n+m=32+18=50 times. Although the number of detections is small, the detection results can only reflect whether a row or a column of touch electrode blocks is short-circuited or open-circuited, and it is impossible to accurately determine the short-circuit or open-circuit condition of each touch electrode block. In addition, in the case of detecting all touch electrode blocks one by one, the number of times of detection = n × m = 32 × 18 = 576 times, although the short circuit or open circuit of each touch electrode block can be accurately judged, but it increases The number of inspections is time-consuming and affects work efficiency.

However, in the embodiment of the present invention, within one frame, the touch detection circuit 101 provides the first voltage signal and the modulation signal to the first touch electrode blocks at the M preset time, and provides the first voltage signal and the modulation signal to the second electrode blocks. two voltage signals and modulation signals, and obtain feedback signals from the first touch electrode block 2011 and the second touch electrode block 2012 . Within one frame time, the processor 102 receives the feedback signal from the touch detection circuit 101 at the preset time in the M section, and compares it with the preset value to obtain the change amount of each touch electrode block, and performs interpolation simulation A fitting curve is obtained by fitting, and it is judged whether the trend of the fitting curve matches the positions of the first touch electrode block and the second touch electrode block within the Mth preset time period. The processor can judge whether the positions of the first touch electrode block 2011 and the second touch electrode block 2012 match within the preset time corresponding to the fitting curves according to the M fitting curves, so as to determine whether the touch points in the touch display panel 20 match. Whether there is a short circuit or an open circuit between the control electrode block 201 and the wiring can not only determine the short circuit or open circuit of each touch electrode block, but also shorten the time required for detection, thereby improving the test efficiency of the touch display panel 20 .

In some embodiments of the present invention, the touch detection circuit 101 is configured to provide the first voltage signal and the modulation signal to some touch electrode blocks in the plurality of touch electrode blocks at a preset time, including: In the row or column direction where the electrode blocks are arranged, the touch detection circuit is used to provide a first voltage signal and a modulation signal to a touch electrode block every N touch electrode blocks within a preset time. Among them, 5≥N≥1.

On this basis, when 5≥N≥1, each touch electrode block in different touch display panels is detected as the first touch electrode block at a preset time of one frame, and the touch electrode block and the touch electrode block are Both short circuit and open circuit between the control electrode wires can be detected accurately.

Those skilled in the art can select the specific number of N according to the actual situation. For example, in the case of N=3, as shown in FIGS. The row direction of the arrangement of the control electrode blocks (that is, the horizontal direction X) is separated by three touch electrode blocks, and the first voltage signal and the modulation signal are provided to the touch electrode blocks in the first row and fifth column as the first touch electrode blocks 2011, at the same time, also provide the second touch voltage signal and the modulation signal to the three spaced touch electrode blocks as the second touch electrode blocks 2012 . In this case, the touch electrode block in the second row and the second column is used as the first touch electrode block, and there are three touch electrode blocks in the row direction, and the touch electrode block in the second row and the sixth column is used as the first touch electrode block Block 2011 , providing the second touch voltage signal and modulation signal to the three spaced touch electrode blocks as the second touch electrode blocks 2012 . Similarly, when the touch electrode block in the first row and the first column is the first touch electrode block 2011, along the column direction (that is, the vertical direction Y) where the touch electrode blocks are arranged, there are three touch electrodes at intervals. block, providing the first voltage signal and modulation signal to the touch electrode block in the fifth row and the first column as the first touch electrode block 2011, and at the same time, providing the second touch voltage signal to the three touch electrode blocks at intervals and modulation signal as the second touch electrode block 2012 . In this case, the touch electrode block in the second row and the second column is used as the first touch electrode block 2011, and there are three touch electrode blocks along the row direction, and the touch electrode block in the second row and the sixth column is used as the first touch electrode block. The electrode blocks 2011 are separated by three touch electrode blocks along the column direction, and the touch electrode blocks in the sixth row and second column are used as the first touch electrode blocks 2011 . In this case, four preset times are required in one frame, and each touch electrode block can be detected as the first touch electrode block in a preset time of one frame.

It should be noted that the weak disconnection detection can be performed by controlling the charging time of the touch electrode block 102 of the touch detection circuit 101 or by making the second voltage signal a DC low voltage signal. Wherein, the DC low voltage signal is related to the carrying capacity of the touch electrode blocks in different touch display panels. The short circuit test is performed by making the second voltage signal received by the second touch electrode block 2012 adjacent to the first touch electrode block 2011 a ground signal. When there is a short circuit between the first touch electrode block 2011 and the adjacent second touch electrode block 2012, the current of the touch electrode block with the short circuit is greater than the current of the touch electrode block without the short circuit, according to the touch display When the touch electrode blocks 201 of the panel 20 are normal, the threshold current of the touch electrode blocks 201 is set, and when it is detected that the current of the touch electrode blocks is greater than the threshold current, it can be determined that the touch electrode blocks have a short circuit.

When there is an open circuit in the touch electrode block 201, the interpolated and fitted data matrix corresponding to the M segment preset time can pass an algorithm, for example, within one frame time, (the data matrix at the M-1 segment preset time- The data matrix at the preset time of the M section)/the data matrix at the preset time of the M section, or, in different frame times, (the data matrix at the preset time of the M section of the previous frame-the data matrix at the M section of the current frame The data matrix under the preset time period)/the data matrix under the preset time period of the Mth segment of the current frame, compare the change amount of the adjacent touch electrode blocks in the same row or the same column in the case of an open circuit, and set the touch electrode block According to the reasonable range of the corresponding variation when the disconnection occurs, the disconnection between the touch electrode block and the wiring is analyzed, and the disconnection test result of the touch electrode block 201 is supplemented accordingly. On this basis, it can be judged whether there is an open circuit in the touch display panel 20 in which the touch electrode blocks 201 are evenly distributed, and whether the touch electrode block 201 at the edge position of the touch display panel 20 with a specific area is open circuit.

It can be understood that, since the short-circuited touch electrode blocks 201 in the touch display panel 20 usually appear in pairs or in pieces, a plurality of fitting curves corresponding to preset times and touch electrode blocks appear in one frame. Therefore, a larger number of spaced touch electrode blocks can be set between adjacent first touch electrode blocks in one row or column, and the fitting curve obtained by comparing multiple preset times , it is easier to determine the short-circuited touch electrode block. However, when the number of touch electrode blocks spaced between adjacent first touch electrode blocks in one row or column is increased, the time required for detection of each touch electrode block in the touch display panel may be increased, so , those skilled in the art can reasonably set the number of spaced touch electrode blocks according to actual needs.

In addition, the short circuit between the touch electrode block 201 and the power line is generally a single point of failure, which can also be judged by the above test method. In this case, there will be a fitting curve corresponding to a preset period of time in one frame and The position of the touch electrode block does not match.

In some embodiments of the present invention, the processor 101 is further configured to combine the change amount of the touch electrode block 201 detected at the preset time in the current frame and the changes in all frames before the current frame according to the Kalman filter algorithm. The average value and error of the change amount of the touch electrode block 201 at the preset time can obtain the effective value of the change amount of the touch electrode block 201 at the preset time in the current frame, and predict the touch control at the preset time in the next frame. The interval of the change amount of the control electrode block 201 is determined to determine whether the change amount of the touch electrode block 201 detected in the preset time in the next frame is within the interval.

Among them, the Kalman filter algorithm is an algorithm that uses the linear system state equation to optimally estimate the system state through the input observation data of the system. On this basis, the effective value of the change amount of the touch electrode block 201 at the preset time of the current frame is the optimal solution of the change amount of the touch electrode block 201 at the preset time of the current frame, and the optimal solution considers The impact of environmental factors including noise, interference, etc. Moreover, the error includes a prediction error and a measurement error; the prediction error refers to the uncertainty of the change amount of the touch electrode block 201 detected at a preset time in multiple frames predicted by the Kalman filter algorithm, and the measurement error refers to The difference in the change amount of the touch electrode block 201 detected during the same preset period of time in two adjacent frames is actually tested.

It can be understood that, within one frame time, the processor 101 can obtain M sets of interpolated and fitted data matrices in M preset times. The change amount of the touch electrode block detected in the current frame (such as the 201st frame) at the Mth preset time, and the Mth preset time in all frames before the current frame (such as the 1st frame to the 200th frame) Set the average value and error of the change amount of the touch electrode block under the time, obtain the effective value of the change amount of the touch electrode block 201 under the preset time of the Mth section of the current frame, and predict the next frame (for example, the 202nd frame). In the range of the change amount of the touch electrode block 201 in the M preset time period, it is determined whether the change amount of the touch electrode block 201 detected in the M preset time period in the next frame is within the range. If the change amount of the touch electrode block 201 detected at the Mth preset time of the next frame is within this interval, the change amount of the touch electrode block 201 detected at the Mth preset time of the next frame is valid. Value, the processor obtains the fitting curve according to the change amount of the touch electrode block 201 detected in the Mth preset time, if the change amount of the touch electrode block 201 detected in the Mth preset time in the next frame If it is not in this interval, the change amount of the touch electrode block 201 detected at the preset time of the Mth section of the next frame is not an effective value, and the processor 101 will discard the change amount detected at the preset time of the Mth section of the next frame. The variation of the touch electrode block 201 will not obtain a fitting curve. In this case, the influence of errors caused by the detection environment on the detection result of the touch electrode block 201 can be effectively avoided.

In some embodiments of the present invention, as shown in FIG. 12 , the touch detection circuit includes multiple detection sub-circuits AFE (Analog Front Effect) and multiple data selectors MUX.

A data selector MUX corresponds to and is electrically connected to a row of touch electrode blocks.

It can be understood that the number of data selectors MUX is the same as the number of columns of touch electrode blocks, that is, when the touch display panel has m columns of touch electrode blocks, the number of data selectors MUX is m . Moreover, the first column of touch electrode blocks corresponds to and is electrically connected to the first data selector MUX (1), the second column of touch electrode blocks corresponds to and is electrically connected to the second data selector MUX (2), and the mth The column touch electrode block corresponds to and is electrically connected to the mth data selector MUX(m).

Multiple detection sub-circuits AFE are electrically connected to the data selector MUX. A plurality of detection sub-circuits AFE electrically connected to a data selector MUX corresponds to a column of touch electrode blocks electrically connected to the data selector MUX. For example, as shown in Figure 13, the data selector MUX(m) corresponding to the mth column of touch electrode blocks is electrically connected to a plurality of detection sub-circuits AFE(b1)-AFE(bn), and the detection sub-circuit AFE(b1) ~AFE(bn) corresponds to and is electrically connected to the m-th column of touch electrode blocks 201 electrically connected to the data selector MUX(m).

It can be understood that one data selector MUX is connected to multiple detection sub-circuits AFE, and the number of detection sub-circuits AFE electrically connected to one data selector MUX is equal to the number of rows of touch electrode blocks, that is, in the touch When the display panel has n rows of touch electrode blocks, the number of detection sub-circuits AFE electrically connected to one data selector MUX is n. In addition, a plurality of detection sub-circuits AFE(a1)-AFE(an) electrically connected to the first data selector MUX(1), the detection sub-circuit AFE(a1) corresponds to the touch electrode block in the first row and first column , the nth detection subcircuit AFE(an) corresponds to the touch electrode block in the nth row and first column, and a plurality of detection subcircuits AFE(b1) to AFE( bn), the detection sub-circuit AFE(b1) corresponds to the touch electrode block at the mth column of the first row, and the nth detection subcircuit AFE(bn) corresponds to the touch electrode block at the mth column of the nth row.

Multiple touch electrode blocks in a row of touch electrode blocks are electrically connected to the same detection sub-circuit through respective corresponding data selectors MUX.

For example, as shown in Figure 12, the touch electrode block in the first row and the first column is electrically connected to the detection sub-circuit AFE (a1) through the data selector MUX (1), and the touch electrode block in the first row and the second column is connected through its corresponding The data selector MUX (2) is electrically connected to the detection sub-circuit AFE (a1), and the touch electrode block in the i-1th column of the first row is connected to the detection sub-circuit AFE ( a1) Electrically connected, the touch electrode block in the i-th column of the first row is electrically connected to the detection sub-circuit AFE (b1) through its corresponding data selector MUX(i), and the touch electrode block in the m-1th column of the first row passes through Its corresponding data selector MUX(m-1) is electrically connected to the detection sub-circuit AFE(b1), and the touch electrode block in the mth column of the first row is connected to the detection sub-circuit AFE(b1) through its corresponding data selector MUX(m). b1) electrical connection. The touch electrode block in the nth row and the first column is electrically connected to the detection sub-circuit AFE(an) through its corresponding data selector MUX (1), and the touch electrode block in the nth row and the second column is connected through its corresponding data selector MUX (2) It is electrically connected to the detection sub-circuit AFE(an), and the touch electrode block in the nth row and i-1 column is electrically connected to the detection sub-circuit AFE(an) through its corresponding data selector MUX(i-1), The touch electrode block in row n, column i is electrically connected to the detection sub-circuit AFE (bn) through its corresponding data selector MUX(i), and the touch electrode block in column m-1 in the first row is selected through its corresponding data The device MUX(m-1) is electrically connected to the detection sub-circuit AFE(bn), and the touch electrode block in the nth row and the mth column is electrically connected to the detection sub-circuit AFE(bn) through its corresponding data selector MUX(m), Wherein, i is not greater than m.

The detection sub-circuit AFE is also electrically connected to the voltage signal input terminal VR.

The data selector MUX is used to electrically connect the detection sub-circuit AFE to the touch electrode block 201 corresponding to the detection sub-circuit AFE.

The detection sub-circuit AFE is used to provide the first voltage signal from the voltage signal input terminal VR to the part of the touch electrode blocks electrically connected to the detection sub-circuit AFE during the charging phase of the touch electrode block 201. block charging, and transmit the detected feedback signal of this part of the touch electrode block to the processor 101, and at different times, provide the rest of the touch electrode blocks electrically connected to the detection sub-circuit AFE from the voltage signal input terminal The second voltage signal of VR charges the rest of the touch electrode blocks, and transmits the detected feedback signal of the rest of the touch electrode blocks to the processor 101 . During the discharge phase of the touch electrode block 201 , the touch electrode block 201 is grounded.

For example, the touch electrode block in the first row and the first column and the touch electrode block in the fifth column in the first row are the first touch electrode blocks, and the touch electrode blocks in the second column to the fourth column in the first row are all second The touch electrode blocks, and the touch electrode blocks in the first row, the first column to the fifth column respectively correspond to the data selectors MUX(1)-MUX(5), and the touch electrode blocks in the first row, the first column to the fifth column are all The respective corresponding data selectors are electrically connected to the detection sub-circuit AFE (a1). 1) and the data selector MUX (5) respectively transmit the first voltage signal from the detection sub-circuit AFE (a1) to the touch electrode block in the first row and the first column and the touch electrode block in the first row and the fifth column, and Feedback signals from the touch electrode block in the first row and the first column and the touch electrode block in the first row and the fifth column are respectively obtained; at another moment, the data selector MUX (2), the data selector MUX (3) and the data The selector MUX (4) transmits the second voltage signal from the detection sub-circuit AFE (a1) to the touch electrode block in the first row and the second column, the touch electrode block in the first row and the third column, and the touch electrode block in the first row and the fourth The touch electrode blocks in the first row and the second column, the touch electrode blocks in the first row and the third column, and the touch electrode blocks in the first row and the fourth column are respectively obtained.

It should be noted that the data selector MUX can transmit signals from the detection sub-circuit AFE corresponding to the touch electrode block 201 to the touch electrode block 201 electrically connected to the data selector MUX at different times according to the signal from the IC. signal of.

In addition, in some other embodiments of the present invention, the touch detection circuit 101 includes a plurality of detection sub-circuits AFE, and the detection sub-circuits AFE are in one-to-one correspondence with the touch electrode blocks 201 and are electrically connected, that is, there is no need to pass through the data selector MUX , a detection sub-circuit AFE transmits a signal to a touch electrode block 201 .

In some embodiments of the present invention, as shown in FIG. 12 , the touch detection circuit further includes a modulation signal input sub-circuit 103 .

The modulation signal input sub-circuit 103 is electrically connected to the modulation signal input terminal VC and the plurality of touch electrode blocks 201 .

The modulation signal input sub-circuit 103 is used for transmitting the modulation signal from the modulation signal input terminal VC to the touch electrode block 201 during the charging phase of the touch electrode block 201 .

It should be noted that, as shown in FIG. 12 , when the touch detection circuit 101 includes a plurality of data selectors MUX, the modulation signal input sub-circuit 103 is electrically connected to the plurality of data selectors MUX, and through the data selector MUX, The modulation signal is transmitted to the touch electrode block 201 .

In some embodiments of the present invention, as shown in FIG. 14 , the detection subcircuit AFE includes a first switch S1, a second switch S2, a first amplifier OP1, a first capacitor C1, a third switch S3, and a digital-to-analog converter ADC , and digital signal processor DSP.

The first end of the first switch S1 is electrically connected to the negative input end of the first amplifier OP1, and the second end of the first switch S1 is electrically connected to the data selector MUX.

It should be noted that, when the detection sub-circuit AFE corresponds to the touch electrode block one by one, the second end of the first switch S1 is electrically connected to the touch electrode block.

The first end of the second switch S2 is electrically connected to the second end of the first switch S1, and the second end of the second switch S2 is grounded.

The positive input end of the first amplifier OP1 is electrically connected to the voltage signal input end, and the output end of the first amplifier OP1 is electrically connected to the input end of the digital-to-analog converter ADC.

The output end of the digital-to-analog converter ADC is electrically connected to the input end of the digital signal processor DSP, and the output end of the digital signal processor DSP is electrically connected to the processor 102 .

A first pole of the first capacitor C1 is electrically connected to the negative input terminal of the first amplifier OP1, and a second pole of the first capacitor C1 is electrically connected to the output terminal of the first amplifier OP1.

The first end of the third switch S3 is electrically connected to the output end of the first amplifier OP1, and the second end of the third switch S3 is electrically connected to the negative input end of the first amplifier OP1.

In some embodiments of the present invention, as shown in FIG. 14 , the modulation signal input sub-circuit 103 includes a second amplifier OP2 and a fourth switch S4.

The positive input terminal of the second amplifier OP2 is electrically connected to the modulation signal input terminal VC, and the negative input terminal and output terminal of the second amplifier OP2 are both electrically connected to the touch electrode block.

A first end of the fourth switch S4 is electrically connected to the touch electrode block, and a second end of the fourth switch S4 is grounded.

In some embodiments of the present invention, as shown in FIG. 14 , the detection sub-circuit further includes a second capacitor C2, a fifth switch S5 and a sixth switch S6.

The first pole of the second capacitor C2 is electrically connected to the negative input terminal of the first amplifier OP1, and the second pole of the second capacitor C2 is connected to the second end of the fourth switch S4, the first end of the fifth switch S5, and the sixth switch. The second end of S6 is electrically connected.

The second terminal of the fifth switch S5 is grounded. The first terminal of the sixth switch S6 is electrically connected to the initialization voltage terminal VB.

On this basis, the control process of the touch detection device in FIG. 14 will be described. During the charging stage of the touch electrode block within the preset time, the fourth switch S4 is turned off, and the second amplifier OP2 in the modulation signal input sub-circuit 103 transmits the signal from the modulation signal input terminal to all the touch electrode blocks of the touch display panel. The modulation signal of VC makes the potential of one pole of the self-capacitance CP of the touch electrode block equal to the potential of the modulation signal. At this time, the voltage of the self-capacitance CP of the touch electrode block is the reference voltage. On this basis, the first switch S1 is closed, the second switch S2 is opened, and the third switch S3 is opened, and the voltage signal input terminal VR in the detection sub-circuit AFE passes through the first amplifier OP1 and the data selector MUX to the The touch electrode block corresponding to the detection sub-circuit AFE provides a signal to charge the self-capacitance CP of the touch electrode block until the self-capacitance CP of the touch electrode block is fully charged and the voltage is the voltage of the signal from the voltage signal input terminal VR , the first amplifier OP1 automatically stops charging.

At the same time, the sixth switch S6 is closed, the fifth switch S5 is opened, and the second pole of the second capacitor C2 is electrically connected to the initialization voltage terminal VB, so that the potential of the second pole of the second capacitor C2 is the signal from the initialization voltage terminal VB The potential of the first pole of the second capacitor C2 is the same as the potential of the negative input terminal of the first amplifier OP1. At this time, the second capacitor C2 will be charged, and because the potential difference between the two poles of the second capacitor C2 will not change abruptly , therefore, the voltage at the connection point of the second capacitor C2 with the first switch S1 and the first amplifier OP1 can be kept stable.

It can be understood that during the process of charging the self-capacitance CP of the touch electrode block with the signal from the voltage signal input terminal VR, the charging charge will flow through the first capacitor C1, so that the output terminal of the first amplifier OP1 produces a voltage change. After the end, the voltage at the output terminal of the first amplifier OP1 does not change any more. At this time, the voltage at the output terminal of the first amplifier OP1 Vout=VR×CP/C1+VR.

On this basis, the digital-to-analog converter ADC converts the voltage signal from the output terminal of the first amplifier OP1 into a digital signal Rawdata, and transmits it to the processor through the digital signal processor DSP, which is transmitted to the processor through the digital signal processor DSP The digital signal Rawdata can be used as a feedback signal. Wherein, in the initial state of the touch detection device, for example, when the touch detection device is just powered on or reset is completed, the processor stores a preset value of each touch electrode block, and the default value is that the touch electrode block does not occur. Feedback signal when touched. When the touch electrode block is touched, the digital signal Rawdata output by the digital-to-analog converter ADC becomes larger, and is transmitted to the processor through the digital signal processor DSP as a feedback signal, and the processor feeds back the signal when the touch electrode block is touched The difference between the feedback signal and the feedback signal when no touch occurs can obtain the change amount corresponding to the touch electrode block.

In this case, at a moment in the charging phase, the first amplifier OP1 in the detection sub-circuit AFE sends the signal from the voltage signal input terminal VR to the first trigger corresponding to the detection sub-circuit AFE through the data selector MUX. The control electrode block provides a first voltage signal to charge the self-capacitance of the first touch electrode block until the self-capacitance of the first touch electrode block is fully charged and the voltage is the voltage of the first voltage signal from the voltage signal input terminal VR, The first amplifier OP1 stops charging automatically. At this time, the voltage signal from the output terminal of the first amplifier OP1 outputs the feedback signal of the first touch electrode block to the processor through the digital-to-analog converter ADC and the digital signal processor DSP, and the processor outputs the feedback signal of the first touch electrode block according to the feedback signal and the preset value. The variation of the first touch electrode block is obtained by comparison. At another moment in the charging phase, the voltage signal input terminal VR in the detection sub-circuit AFE supplies the second touch electrode block corresponding to the detection sub-circuit AFE through the first amplifier OP1 and the data selector MUX The voltage signal charges the self-capacitance of the second touch electrode block until the self-capacitance of the second touch electrode block is fully charged and the voltage is the voltage of the second voltage signal from the voltage signal input terminal VR, and the first amplifier OP1 automatically stops Charge. At this time, the voltage signal from the output terminal of the first amplifier OP1 outputs the feedback signal of the second touch electrode block to the processor through the digital-to-analog converter ADC and the digital signal processor DSP, and the processor outputs the feedback signal of the second touch electrode block according to the feedback signal and the preset value. The variation of the second touch electrode block is obtained by comparison.

During the preset period of time, during the discharge phase of the touch electrode block, the first switch S1 is turned off, the second switch S2 is turned on, and the fourth switch S4 is turned on, so that both poles of the self-capacitance CP of the touch electrode block are grounded, thereby discharging. In this case, the third switch S3 is closed, and the first amplifier OP1 does not work. Moreover, the fifth switch S5 is closed, and the sixth switch S6 is opened, so that the second pole of the second capacitor C2 is electrically connected to the ground terminal, and the second capacitor C2 is discharged.

It should be noted that the second capacitor C2 needs to be recalibrated every time the touch detection device starts to be used.

At the end of the preset time, the processor 102 performs interpolation according to the data matrix composed of the change amount of the first touch electrode block and the change amount of the second touch electrode block, so that the scale of the original data matrix is enlarged, and according to The expanded data matrix fits the curve, and it is judged whether the midpoint of the fitting curve at the position of each touch electrode block matches the position of the touch electrode block. If they are basically matched, there is no short circuit or open circuit between each touch electrode block and the wiring; if there is an abnormal point on the fitting curve, there is a gap between the corresponding touch electrode block and the wiring at the abnormal point position. Poor short circuit or open circuit.

It should be noted that, in the early stage of testing the touch electrode blocks in the touch display panel, an initial standard for judging whether the touch electrode blocks are short-circuited or disconnected can be set according to the simulation test results of multiple touch electrode blocks. After the touch display panel is mass-produced, the initial standard can be revised according to the working capabilities of different touch display panels and ICs, and the test results of different touch electrode blocks.

On this basis, an embodiment of the present invention also provides a control method for a touch detection device, including:

Referring to FIG. 1 , the touch detection circuit 101 provides a first voltage signal and a modulation signal to some touch electrode blocks in the plurality of touch electrode blocks 201 at a preset time, and supplies the first voltage signal and a modulation signal to the rest of the plurality of touch electrode blocks. The electrode block provides the second voltage signal and the modulation signal, and obtains the feedback signal of each touch electrode block.

Wherein, the voltage of the second voltage signal is lower than the voltage of the first voltage signal. The touch electrode block receiving the first voltage signal is used as the first touch electrode block 2011 , and the touch electrode block receiving the second voltage signal is used as the second touch electrode block 2012 .

The processor 101 compares the received feedback signal from the touch detection circuit with the preset value to obtain the variation of the first touch electrode block and the second touch electrode block respectively. And interpolation fitting is performed on the variation of the first touch electrode block and the second touch electrode block, and it is judged whether the trend of the fitting curve matches the positions of the first touch electrode block and the second touch electrode block.

On this basis, in some embodiments of the present invention, one frame includes M preset time periods, where M is a positive integer greater than 1.

The control method of the touch detection device further includes: the touch detection circuit 101 provides the first voltage signal and the modulation signal to the plurality of first touch electrode blocks 2011 at each preset time, and supplies the first voltage signal and the modulation signal to the plurality of second touch electrode blocks 2012 Provide a second voltage signal and a modulation signal, and acquire feedback signals of the first touch electrode block and the second touch electrode block.

Wherein, the touch detection circuit 101 provides the first voltage signal to a completely different first touch electrode block, and provides the second voltage signal to a completely different second touch electrode block at different preset times.

In some embodiments of the present invention, the control method of the touch detection device further includes: the processor 101 combines the change amount of the touch electrode block detected at the preset time in the current frame according to the Kalman filter method, and the current The average value and error of the change amount of the touch electrode block at the preset time in all frames before the frame, obtain the effective value of the change amount of the touch electrode block at the preset time in the current frame, and predict the change amount of the touch electrode block in the next frame The interval of the change amount of the touch electrode block under the preset practice is judged whether the change amount of the touch electrode block detected in the preset interval in the next frame is within the interval.

The above-mentioned control method of the touch detection device has the same beneficial effect as that of the above-mentioned touch detection device, so details are not repeated here.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (13)

1. A touch detection device, comprising: a touch detection circuit and a processor;

the touch detection circuit is electrically connected with a plurality of touch electrode blocks which are arranged in an array in the touch display panel; the touch detection circuit is configured to provide a first voltage signal and a modulation signal to some of the plurality of touch electrode blocks at a preset time, provide a second voltage signal and the modulation signal to the rest of the plurality of touch electrode blocks, and acquire feedback signals of the touch electrode blocks; wherein the voltage of the second voltage signal is less than the voltage of the first voltage signal; taking the touch electrode blocks receiving the first voltage signals as first touch electrode blocks, and taking the touch electrode blocks receiving the second voltage signals as second touch electrode blocks, wherein the second touch electrode blocks are arranged around each first touch electrode block;

The processor is electrically connected with the touch detection circuit; the processor is configured to compare the received feedback signal from the touch detection circuit with a preset value to obtain the variation of the first touch electrode block and the second touch electrode block respectively; and performing interpolation fitting on the variation of the first touch electrode block and the second touch electrode block, and judging whether the trend of a fitting curve is matched with the positions of the first touch electrode block and the second touch electrode block.

2. The touch detection device according to claim 1, wherein a frame includes M segments of the preset time, M being a positive integer greater than 1;

the touch detection circuit is configured to provide a first voltage signal and a modulation signal to the plurality of first touch electrode blocks, provide a second voltage signal and the modulation signal to the plurality of second touch electrode blocks, and acquire feedback signals of the first touch electrode blocks and the second touch electrode blocks in each section of the preset time;

the touch detection circuit provides the first voltage signal to the completely different first touch electrode blocks at different preset times.

3. The touch detection device of claim 1, wherein the touch detection circuit is configured to provide the first voltage signal and the modulation signal to a portion of the plurality of touch electrode blocks at a preset time, comprising:

the touch detection circuit is configured to provide the first voltage signal and the modulation signal to one touch electrode block every N touch electrode blocks within a preset time along a row direction or a column direction of the arrangement of the plurality of touch electrode blocks; wherein N is more than or equal to 5 and more than or equal to 1.

4. The touch detection device according to claim 2, wherein the processor is further configured to obtain an effective value of the change amount of the touch electrode block at the preset time in the current frame by combining the change amount of the touch electrode block detected at the preset time in the current frame and an average value and an error of the change amounts of the touch electrode block at the preset time in all frames before the current frame according to a kalman filtering algorithm, predict a section of the change amount of the touch electrode block at the preset time in the next frame, and determine whether the change amount of the touch electrode block detected at the preset time in the next frame is within the section.

5. The touch detection device of claim 1, wherein the touch detection circuit comprises a plurality of detection subcircuits and a plurality of data selectors;

one of the data selectors corresponds to one row of the touch electrode blocks and is electrically connected with the touch electrode blocks;

a plurality of the detection subcircuits are electrically connected with the data selector;

the detection subcircuits are electrically connected with one data selector and correspond to one row of touch electrode blocks electrically connected with the data selector one by one; the data selector is configured to electrically connect the detection sub-circuit and the touch electrode block corresponding to the detection sub-circuit;

a plurality of touch electrode blocks in a row of touch electrode blocks are electrically connected with the same detection sub-circuit through corresponding data selectors;

the detection sub-circuit is further electrically connected with the voltage signal input end, and is configured to provide a first voltage signal from the voltage signal input end for the part of the touch electrode blocks electrically connected with the detection sub-circuit in a charging stage of the touch electrode blocks, charge the part of the touch electrode blocks, transmit feedback signals of the part of the touch electrode blocks obtained by detection to the processor, provide a second voltage signal from the voltage signal input end for the rest of the touch electrode blocks electrically connected with the detection sub-circuit at different moments, charge the rest of the touch electrode blocks, and transmit the feedback signals of the rest of the touch electrode blocks obtained by detection to the processor; and in the discharging stage of the touch electrode block, grounding the touch electrode block.

6. The touch detection device of claim 1, wherein the touch detection circuit further comprises a modulation signal input sub-circuit;

the modulation signal input subcircuit is electrically connected with the modulation signal input end and the plurality of touch electrode blocks; the modulation signal input sub-circuit is configured to transmit a modulation signal from the modulation signal input terminal to the touch electrode block in a charging phase of the touch electrode block.

7. The touch detection device of claim 5, wherein the detection subcircuit comprises a first switch, a second switch, a first amplifier, a first capacitor, a third switch, a digital-to-analog converter, and a digital signal processor;

a first end of the first switch is electrically connected with a negative input end of the first amplifier, and a second end of the first switch is electrically connected with the data selector; the first end of the second switch is electrically connected with the second end of the first switch, and the second end of the second switch is grounded;

the positive input end of the first amplifier is electrically connected with the voltage signal input end, and the output end of the first amplifier is electrically connected with the input end of the digital-to-analog converter;

The output end of the digital-to-analog converter is electrically connected with the input end of the digital signal processor, and the output end of the digital signal processor is electrically connected with the processor;

a first pole of the first capacitor is electrically connected with the negative input end of the first amplifier, and a second pole of the first capacitor is electrically connected with the output end of the first amplifier;

the first end of the third switch is electrically connected with the output end of the first amplifier, and the second end of the third switch is electrically connected with the negative input end of the first amplifier.

8. The touch detection device of claim 6, wherein the modulated signal input sub-circuit comprises a second amplifier and a fourth switch;

the positive input end of the second amplifier is electrically connected with the modulation signal input end, and the negative input end and the output end of the second amplifier are electrically connected with the touch electrode block;

the first end of the fourth switch is electrically connected with the touch electrode block, and the second end of the fourth switch is grounded.

9. The touch detection device of claim 7, wherein the detection subcircuit further comprises a second capacitor, a fifth switch, and a sixth switch;

A first electrode of the second capacitor is electrically connected with the negative input end of the first amplifier, and a second electrode of the second capacitor is electrically connected with the first end of the fifth switch and the second end of the sixth switch;

the second end of the fifth switch is grounded; the first end of the sixth switch is electrically connected with the initialization voltage end.

10. A display module comprising the touch detection device of any one of claims 1-9 and a touch display panel;

the touch display panel comprises a plurality of touch electrode blocks which are arranged in an array manner and touch electrode wires which are electrically connected with the touch electrode blocks, and the touch electrode wires are electrically connected with the touch detection device.

11. A control method of a touch detection device according to any one of claims 1 to 9, comprising:

the touch detection circuit provides a first voltage signal and a modulation signal for part of the touch electrode blocks in a plurality of touch electrode blocks at preset time, provides a second voltage signal and the modulation signal for the rest of the touch electrode blocks in the plurality of touch electrode blocks, and acquires feedback signals of the touch electrode blocks; wherein the voltage of the second voltage signal is less than the voltage of the first voltage signal; taking the touch electrode block receiving the first voltage signal as a first touch electrode block, and taking the touch electrode block receiving the second voltage signal as a second touch electrode block;

The processor compares the received feedback signals from the touch detection circuit with preset values to respectively obtain the variation of the first touch electrode block and the variation of the second touch electrode block; and performing interpolation fitting on the variation of the first touch electrode block and the second touch electrode block, and judging whether the trend of a fitting curve is matched with the positions of the first touch electrode block and the second touch electrode block.

12. The control method of the touch detection device according to claim 11, wherein a frame includes M segments of the preset time, M being a positive integer greater than 1;

the control method of the touch detection device further comprises the following steps:

the touch detection circuit provides first voltage signals and modulation signals for a plurality of first touch electrode blocks in each section of preset time, provides second voltage signals and modulation signals for a plurality of second touch electrode blocks, and acquires feedback signals of the first touch electrode blocks and the second touch electrode blocks;

the touch detection circuit provides the first voltage signal to the completely different first touch electrode blocks and provides the second voltage signal to the completely different second touch electrodes at different preset times.

13. The control method of a touch detection device according to claim 12, characterized in that the control method of the touch detection device further comprises:

the processor obtains an effective value of the variation of the touch electrode block in the preset time of the current frame by combining the variation of the touch electrode block detected in the preset time of the current frame and the average value and the error of the variation of the touch electrode block in the preset time of all frames before the current frame according to a Kalman filtering algorithm, predicts a section of the variation of the touch electrode block in the preset time of the next frame, and judges whether the variation of the touch electrode block detected in the preset time of the next frame is located in the section.

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