TWI603253B - Embedded self-capacitance touch display device and water detection method - Google Patents

Description

Embedded self-capacitive touch display device and water detecting method

The present invention relates to the field of touch screen control, and in particular to an in-cell self-capacitive touch display device and a water detecting method.

Since the self-capacitor screen detects the capacitance of each channel to the ground, there is no change in the amount of touch on the isolated water. Even if there is water, touching the screen will not affect other places, as shown in Figure 1 and Figure 2. In the existing scan, there are two scan frames in one scan period, but when there is water droplet on the self-capacity screen, the position of the water drop cannot be detected, but when the finger touches on the water, the water connected with the finger forms an equal The potential surface makes the touch area larger than the real finger and reduces the control precision.

An object of the present invention is to provide an in-cell self-capacitive touch display device and a water detecting method, which improve the accuracy of the water-carrying operation.

In order to solve the above technical problem, an embodiment of the present invention provides a water detecting method for an in-cell self-capacitive touch display device, which comprises: dividing all column channels of a full screen into multi-component channels, and performing touch scanning on each sub-channel. The component channel includes at least one column of channels, and each scan period includes a normal touch scan frame and a water detection scan frame. Normal touch scan frame and water detection scan frame respectively The touch reference value is set, and the change amount of the normal touch scan frame data and the water detection scan frame data collected in each scan period is compared with respect to the respective set touch reference values. In the normal touch state, the amount of change between the normal touch scan frame data and the water detection scan frame data relative to the respective touch reference values is greater than the threshold. In the case of the isolated water droplets, the amount of change in the normal touch scan frame data of the sub-channel covered by the water relative to the set touch reference value is smaller than the change amount of the water detection scan frame data relative to the set touch reference value. The capacitance value data of the sub-channel covered by water is processed to remove the interference of the water droplets on the capacitance value of the sub-channel covered by water.

The normal touch scan frame is a touch scan for all sub-channels, and the water detection scan frame is an interval scan for the sub-channels, that is, one of the adjacent two sub-channels and one sub-channel for normal touch scanning. The other sub-channel is grounded.

In the embodiment, the in-cell self-capacitive touch display device water detecting method comprises, in an embodiment, each of the scan periods includes two normal touch scan frames and one water detection scan frame.

In the embodiment, the water detecting method of the in-cell self-capacitive touch display device is as follows. In one embodiment, one water detecting scanning frame is performed after each of the two normal touch scanning frames is completed.

In the embodiment of the present invention, the water detecting scanning frame is between two normal touch scanning frames.

In the embodiment, the at least one water detection scan frame is located between two adjacent normal touch scan frames.

In the embodiment, the embedded self-capacitive touch display device water detecting method, in one embodiment, each scan period further includes a secondary water detection scan frame, and the second water detection scan frame is closed. The sub-channel is the normal touch scanning channel of the first water detection scan frame.

In the embodiment, the first self-capacitance touch display device water detecting method, in one embodiment, the first water detecting scanning frame is an even-numbered channel internal grounding and then scanning the odd-numbered sub-channels, and the second water detecting is performed. The scan frame is a scan of the even sub-channel after the odd-numbered channel is grounded.

In the embodiment, the in-cell self-capacitive touch display device water detecting method, in one embodiment, the number of column channels of the multi-component channel is equal.

In addition, the embodiment of the invention further provides an embedded self-capacitive touch display device, comprising: a scanning module and a data analysis module.

The scanning module is used to scan the sub-channels of the specified screen, and one scanning period includes a normal touch scanning frame and a water detecting scanning frame. The normal touch scan frame and the water detection scan frame are respectively set with a touch reference value, and the data analysis module compares the normal touch scan frame data and the water detection scan frame data collected in each scan period with respect to the respective set touch reference values. The amount of change in value. In the normal touch state, the amount of change between the normal touch scan frame data and the water detection scan frame data relative to the respective touch reference values is greater than the threshold. In the case of the isolated water droplets, the amount of change in the normal touch scan frame data of the sub-channel covered by the water relative to the set touch reference value is smaller than the change amount of the water detection scan frame data relative to the set touch reference value. The data analysis module processes the capacitance value data of the sub-channel covered by the water to remove the interference of the water droplets on the capacitance value of the sub-channel covered by the water.

The normal touch scan frame is a scan for all sub-channels, and the water detection scan frame is an interval scan for the sub-channel, that is, one of any two adjacent sub-channels The channel performs normal touch scanning and the other sub-channel is grounded.

In one embodiment, the in-cell self-capacitive touch display device further includes a scan control module for allocating the number of column channels included in the sub-channel and controlling the closing and opening of the corresponding sub-channel.

Compared with the prior art, the in-cell self-capacitive touch display device and the water detecting method provided by the embodiments of the present invention have the following advantages: an in-cell self-capacitive touch display device and a water detecting method, through normal scanning The water detection scan frame is added in the cycle, and after the water detection scanning frame is grounded, a part of the sub-channel is grounded, and the water of another part of the channel is effectively detected. By comparing the change of the capacitance value before and after the grounding of the sub-channel, it is determined whether the sub-channel is water or not. status. The water detection scan frame is used to obtain an accurate water state, and then the data is post-processed to improve the accuracy of the water operation.

In summary, the in-cell self-capacitive touch display device and the water detecting method provided by the embodiments of the present invention improve the accuracy of the water-carrying operation by increasing the water detection scan frame.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description are the present invention. Some embodiments of the present invention, as well as those of ordinary skill in the art, may also obtain other drawings based on the general knowledge and common skill.

SX1, SX2‧‧‧ channels

C1, C2, C3‧‧‧ capacitors

Step 10~30‧‧‧In-line self-capacitive touch display device water detection method steps

10‧‧‧ scan module

20‧‧‧Data Analysis Module

FIG. 1 is a schematic diagram of a touch display scan waveform in the prior art.

[Fig. 2] is a list of capacitance values of partial column channels in the case of touch scanning with water droplets in the prior art.

Fig. 3 is a circuit diagram showing the structure of water droplets on two adjacent channels in the embodiment of the present invention.

4 is a schematic diagram showing an equivalent circuit of a sub-channel when water detection is performed in an embodiment of the present invention.

FIG. 5 is a schematic diagram of a touch display scan waveform in a water detecting method of an in-cell self-capacitive touch display device according to an embodiment of the present invention.

6 is a capacitance value of a part of a channel during a water detection scan in the water detecting method of the in-cell self-capacitive touch display device according to an embodiment of the present invention.

FIG. 7 is a flow chart showing the steps of a specific embodiment of a water detecting method for an in-cell self-capacitive touch display device according to an embodiment of the present invention.

FIG. 8 is a capacitance data diagram of a single channel when a normal touch is detected in a water detecting method of an in-cell self-capacitive touch display device according to an embodiment of the present invention.

FIG. 9 is a diagram showing a capacitance data of a single channel when there is a water drop in the water detecting method of the in-cell self-capacitive touch display device according to an embodiment of the present invention.

FIG. 10 is a schematic diagram of component connections of an in-cell self-capacitive touch display device according to an embodiment of the present invention.

FIG. 11 is a flow chart showing steps of an operation mode of an in-cell self-capacitive touch display device according to an embodiment of the present invention.

FIG. 12 is a schematic diagram showing the logic steps of the in-line self-capacitive touch display device using the software for water droplet processing according to an embodiment of the present invention.

FIG. 13 is a soft view of an in-cell self-capacitive touch display device according to an embodiment of the present invention. A schematic diagram of the steps of removing the water droplets from the body.

FIG. 14 is a schematic diagram showing another positional relationship of the in-cell self-capacitive touch display device provided on the screen according to the embodiment of the present invention.

FIG. 15 is a schematic diagram showing another positional relationship of the in-cell self-capacitive touch display device provided on the screen according to the embodiment of the present invention.

As described in the prior art, the embedded self-capacitive screen in the prior art detects the capacitance of each channel to the ground, so there is no change in the amount of touch on the isolated water, even when there is water. There will be no influence on other parts of the screen, but when the finger touches on the water, the water connected with the finger will form an equipotential surface, which makes the touch area larger than the real finger and reduces the control precision.

Based on this, an embodiment of the present invention provides a water detecting method for an in-cell self-capacitive touch display device, which comprises: dividing all column channels of a full screen into multi-component channels, and performing touch scanning on each sub-channel, each component channel The system includes at least one column of channels, and each scan period includes a normal touch scan frame and a water detection scan frame.

The normal touch scan frame and the water detection scan frame respectively set a touch reference value, and compare the change amount of the normal touch scan frame data and the water detection scan frame data collected in each scan period with respect to the respective set touch reference values. In the normal touch state, the amount of change between the normal touch scan frame data and the water detection scan frame data relative to the respective touch reference values is greater than the threshold. In the case of isolated water droplets, the normal touch scan frame data of the sub-channel covered by water is relatively set with the touch reference The amount of change in the value generated is less than the amount of change in the water detection scan frame data relative to the set touch reference value.

The capacitance value data of the sub-channel covered by water is processed to remove the interference of the water droplets on the capacitance value of the sub-channel covered by water.

The normal touch scan frame is a touch scan for all sub-channels, and the water detection scan frame is an interval scan for the sub-channels, that is, one of the adjacent two sub-channels and one sub-channel for normal touch scanning. The other sub-channel is grounded.

In addition, an embodiment of the present invention provides an in-cell self-capacitive touch display device, including: a scanning module and a data analysis module.

The scanning module is used to scan the sub-channels of the specified screen, and one scanning period includes a normal touch scanning frame and a water detecting scanning frame.

The normal touch scan frame and the water detection scan frame are respectively set with a touch reference value, and the data analysis module compares the normal touch scan frame data and the water detection scan frame data collected in each scan period with respect to the respective set touch reference values. The amount of change. In the normal touch state, the amount of change between the normal touch scan frame data and the water detection scan frame data relative to the respective touch reference values is greater than the threshold. In the case of the isolated water droplets, the amount of change in the normal touch scan frame data of the sub-channel covered by the water relative to the set touch reference value is smaller than the change amount of the water detection scan frame data relative to the set touch reference value. The data analysis module processes the capacitance value data of the sub-channel covered by the water to remove the interference of the water droplets on the capacitance value of the sub-channel covered by the water.

The normal touch scan frame is a scan for all sub-channels, and the water detection scan frame is an interval scan for the sub-channel, that is, one of any two adjacent sub-channels The channel performs normal touch scanning and the other sub-channel is grounded.

It should be noted that the water detection scan frame in the embodiment of the present invention may be a scan of the other sub-channels after the partial sub-channels are grounded, and specifically, the water detection is performed on the even-numbered sub-channels after the odd-numbered sub-channels are short-circuited to the ground. . It is also possible to detect water for an odd-numbered channel after the even-numbered channel is short-circuited to ground.

As shown in FIG. 3, the capacitance of the channel SX1 to the ground is C1, the capacitance of the channel SX2 to the ground is C2, and when there is a water droplet between the channels SX1 and SX2, the capacitance of the water droplet formed in the channel SX1 and the channel SX2 is C3, and then Short-circuit the channel SX2 to the ground. As shown in Figure 4, after the channel SX2 is short-circuited to ground, the equivalent capacitance Ceq of the channel SX1 is equal to the capacitance value of the capacitor C2 and C3 connected in series and then connected in parallel with the capacitor C1. It can be found that the equivalent capacitance is significantly larger than the self-to-ground capacitance of the channel SX1. Therefore, the ground capacitance of the SX1 after the waterproof scanning of the SX1 can be made through the comparison channel SX1 after the ground capacitance of the normal touch scanning and the channel SX2 are short-circuited to the ground. When water covers more than two adjacent channels, the open channel is connected to the grounded channel through water, and equivalently introduces additional capacitance, resulting in a change in the total equivalent capacitance of the scanning channel. Scanning to detect such changes, to achieve water detection, and subsequent processing through software, such as using Firmware software algorithm for data processing, screening out data beyond the threshold, determining that there is water on the channel corresponding to the data, and The data calculation method adopted by the water-covered sub-channel can prevent the water connected by the finger from forming the equipotential surface, so that the touch area is larger than the real finger, and the control precision is reduced. That is to say, the solution can reduce or eliminate the influence of water droplets on the touch precision, improve the accuracy of the water-carrying operation, and realize precise touch on the screen under the premise that the screen has water droplets.

During the scanning process, due to the Source line (signal electrode line) and the Gate line (scanning) The electrode line) transmits the same excitation signal at the same time, which can eliminate the coupling capacitance generated by the common electrode (referred to as Vcom) with the display electrode, thereby improving the accuracy of scanning.

In summary, the in-cell self-capacitive touch display device and the water detecting method provided by the embodiments of the present invention add a water detection scan frame in a normal scan period, and after a water detection scan frame allows a part of the sub-channels to be grounded, To achieve effective detection of water in another part of the channel, by comparing the change of the capacitance value before and after the sub-channel grounding, it is judged whether the sub-channel is in a water state. The water detection scan frame is used to obtain an accurate water state, and then the data is post-processed to improve the accuracy of the water operation.

The above described objects, features, and advantages of the present invention will be more apparent from the aspects of the invention.

Specific details are set forth in the following description in order to provide a thorough understanding of the invention. However, the present invention can be implemented in a variety of other ways than those described herein, and those skilled in the art can make similar promotions without departing from the spirit of the invention. Therefore, the invention is not limited by the specific embodiments disclosed herein.

Please refer to FIG. 5 , FIG. 6 and FIG. 7 . FIG. 5 is a schematic diagram of a touch display scan waveform in a water detecting method of an in-cell self-capacitive touch display device according to an embodiment of the present invention. FIG. 6 is a diagram showing capacitance values of a part of a channel during a water detection scan in the water detecting method of the in-cell self-capacitive touch display device according to an embodiment of the present invention. FIG. 7 is a flow chart showing the steps of a specific implementation manner of a water detecting method for an in-cell self-capacitive touch display device according to an embodiment of the present invention.

FIG. 5 shows two normal touch scan frames and one water detection scan frame in one scan cycle, and the scan period is the same as one scan cycle in the prior art, and each normal The scan duration of the touch scan frame and the water detection scan frame may also be equal.

As can be seen from Fig. 6, the capacitance values at 12 positions of Chy10, Chy11, Chy12, and Chy13 in columns Chx08, Chx10, and Chx12 are significantly larger than those at other positions, and the capacitance values of each of the smallest units are substantially equal due to other positions. It can be seen that due to external factors, the capacitance values at these positions on the screen change, most likely due to the presence of water droplets at these locations, and the reason why the capacitance values at different positions become larger is different. The thickness of the water droplets is different here, that is, the presence of isolated water droplets on the screen is detected in this way.

In a specific manner, as shown in FIG. 7, the in-cell self-capacitive touch display device water detecting method includes:

Step 10: Divide all the columns of the full screen into multi-component channels, and perform touch scanning on the sub-channels. Each component channel includes at least one column of channels, and each scanning period includes a normal touch scanning frame and a water detecting scanning frame.

Step 20: The normal touch scan frame and the water detection scan frame respectively set a touch reference value, and compare the change of the normal touch scan frame data and the water detection scan frame data collected in each scan period with respect to the respective set touch reference values. the amount. In the normal touch state, the amount of change between the normal touch scan frame data and the water detection scan frame data relative to the respective touch reference values is greater than the threshold. In the case of the isolated water droplets, the amount of change in the normal touch scan frame data of the sub-channel covered by the water relative to the set touch reference value is smaller than the change amount of the water detection scan frame data relative to the set touch reference value.

Step 30: processing the capacitance value data of the water-covered sub-channel to remove water The interference of the drop on the capacitance value of the sub-channel covered by water.

The normal touch scan frame is a touch scan for all sub-channels, and the water detection scan frame is an interval scan for the sub-channels, that is, one of the adjacent two sub-channels and one sub-channel for normal touch scanning. The other sub-channel is grounded.

The water detecting method of the embedded self-capacitance touch display device detects the scanning frame by adding water in the normal scanning period, and after the water detecting scanning frame allows a part of the channel to be grounded, the water is effectively detected for the other part of the channel. The water detection scan frame is used to obtain an accurate water state, and then the data is post-processed to improve the accuracy of the water operation.

It should be noted that, in the present invention, the water droplets may completely cover one sub-channel, or may cover a part of the sub-channel, but only cover a small part of the sub-channel, even if the water is operated, the actual effect is affected. It is also very limited, so a threshold is generally set, that is, when the change of the capacitance value of the sub-channel is greater than the threshold, it indicates that the operation with water has a great influence on the normal touch, otherwise, it can be ignored, and the present invention does not limit the threshold. , can be set according to the touch accuracy of different screens.

The scanning frequency of the present invention preferentially adopts the common frequency of the current electronic device of 60 Hz, and increasing the water detection scanning frame in one scanning period does not affect the reporting rate. However, the invention is applicable to any frequency. It should be noted that the length of the water detection scan frame should not be too short. Otherwise, the water detection scan cannot be completed for all the sub-channels, and the duration of the water detection scan frame in one cycle cannot be too long. Otherwise, the normal touch The duration of the control scan frame is relatively short, which affects the report rate. The normal touch scan scans all the sub-channels and is the main scan for the touch. Therefore, normal touch scanning is very important, so it is necessary. Get enough information and data processing time To make the touch accurate. One cycle of a general scan includes two normal touch scan frames and one water detection scan frame. It should be noted that the present invention does not limit the number of scanning frames in one cycle of scanning. To ensure the accuracy of the waterproof detection and the accuracy of the normal touch scanning, three scanning frames are included in one cycle of scanning, and two normal. The touch scan frame and a water detection scan frame may have the same duration or different lengths, but in order to reduce the processing difficulty of the data and reduce the difficulty of scanning, the duration of each scan frame is the same.

The determination logic of the water detection method of the embedded self-capacitive touch display device water detection method is as follows: a two-touch scan frame and a water detection scan frame are included in one scan cycle as an example to illustrate the judgment logic of the water detection: The normal touch scan frames are recorded as A frame and B frame respectively, and the water detection scan frame is recorded as C frame: A, B, and C frames have independent touch reference values (Baseline), which are recorded as BaseA, BaseB, and BaseC. The raw data collected by each frame scan (Rawdata) is recorded as RawA, RawB, RawC, respectively. By comparing the respective Rawdata and Baseline, the amount of change (Diff) of each scan can be obtained, and the variation is marked as DiffA. , DiifB, DiffC.

When a normal touch occurs, that is, when a conductor such as a finger touches, DiffA, DiffB, and DiffC each generate a variation larger than the threshold, as shown in FIG. The change characteristic of water droplets is that the DiffA and DiffB of the sub-channel covered by water are basically unchanged, but DiffC has obvious changes, as shown in Fig. 9.

The touch reference values and thresholds used in the A, B, and C frames may be the same or different.

In a scan cycle, only the normal touch scan frame and the water detection scan frame can only obtain the change of the capacitance value of one sub-channel through comparison, and the change of the capacitance value of the adjacent sub-channel cannot be obtained. The detection accuracy of the water droplets on the screen improves the accuracy of the operation with water. The one cycle of the scan also includes the secondary water detection scan frame, and the second water detection scan frame is closed for the first water detection scan frame. The touch scan channel, that is, the general water detection scan frame is opposite to the channel for opening and closing the secondary water detection scan frame. The second water detection scan frame as shown is the scan of the even sub-channel after the odd-numbered channel is grounded. Then, the first water detection scan frame in the secondary water detection scan frame is a scan of the odd sub-channel after the even-numbered sub-channel is grounded. Thus, in one scan cycle, the odd-numbered sub-channels and the even-numbered sub-channels are scanned twice in three scan frames, short-circuiting to ground, improving water detection accuracy.

Multiple sub-channels can take into account the different number of columns in each sub-channel, but the effective water detection premise is that the water droplets must be covered on at least one of the normal touch scanning and grounding channels, so the inter-row scanning method is preferred, and the diameter can be detected as much as possible. Smaller drops of water.

If the number of column channels included in the sub-channel is large and the water droplets are small, even if the water detection scanning frame is added during the scanning process, the change of the capacitance value of the normal touch scanning and the waterproof scanning time channel is not obvious, and the difficulty is distinguished. Larger, even indistinguishable, so to improve the accuracy of the scan and improve the accuracy of the water-carrying operation, only one column channel is included in the sub-channel.

For the positional relationship between the water detection scan frame and the normal touch scan frame, generally one scan frame is performed after each normal scan scan frame is completed, or the water detection scan frame is in two normal. Between the touch scan frames, this can make the report point uniform and avoid connecting to the blank area between the two display frames, which is simply referred to as a blank frame.

If a scan cycle includes multiple water detection scan frames, there may be no water detection scan frames between two consecutive normal touch scan frames, or at least one water detection scan frame may be located adjacent to two normal touch scans. Between frames.

In order to reduce the amount of calculation and improve the efficiency of the scanning operation, the number of column channels of the multi-component channel is equal.

It should be noted that, the present invention does not specifically limit the number of column channels included in the sub-channel. If the width of the column channel is very small, the number of column channels in the sub-channel can be appropriately increased, and in addition, the number of column channels in the sub-channel can be appropriately increased. The scanning method is small, that is, the sub-channel is scanned in a manner that the number of column channels in the sub-channel is large, and the position where the water droplet exists is first found, and then the number of column channels in the sub-channel is reduced, and the found water droplets are found. The channel is finely scanned and then processed for subsequent data to improve the accuracy of the water detection and improve the accuracy of the water operation.

In addition, the embodiment of the present invention further provides an in-cell self-capacitive touch display device, as shown in FIG. 10, comprising: a scan module 10 and a data analysis module 20.

The scanning module 10 is configured to scan a sub-channel of a specified screen, and one scanning period includes a normal touch scanning frame and a water detecting scanning frame.

The normal touch scan frame and the water detection scan frame are respectively set with touch reference values, and the data analysis module 20 compares the normal touch scan frame data and the water detection scan frame data collected in each scan period with respect to the respective set touch reference values. The amount of change. In the normal touch state, the amount of change between the normal touch scan frame data and the water detection scan frame data relative to the respective touch reference values is greater than the threshold. The normal touch scan frame data phase of the sub-channel covered by water in the state of isolated water droplets The amount of change in the generated touch reference value is smaller than the amount of change in the water detection scan frame data relative to the set touch reference value. The data analysis module processes the capacitance value data of the sub-channel covered by the water to remove the interference of the water droplets on the capacitance value of the sub-channel covered by the water.

The normal touch scan frame is a scan for all sub-channels, and the water detection scan frame is an interval scan of the sub-channels, that is, one of the adjacent two sub-channels, one sub-channel performs normal touch scanning, and the other One sub-channel is grounded.

The working mode of the embedded self-capacitive touch display device is as shown in the flow chart of the step of step 11: first, normal scanning, then water detection scanning, marking the relevant sub-channel covered by water, and then performing normal data. For the treatment, the sub-channels with no water mark are transferred to the normal scan, and the sub-channels with water marks are subjected to the corresponding water data post-processing to remove the influence of water droplets on the touch and improve the accuracy of the touch with water.

The logic for water droplet processing using software is shown in Figure 12: Enter the software to process the water droplet logic, and then perform a normal scan to see if there is any induction. If there is induction, it means there is a normal touch. If there is no induction, then the water detection scan frame is used to see if there is any induction. If there is induction, the water mark is set for the corresponding sub-channel. Otherwise, normal data processing is performed to determine that there is no touch on the channel.

After judging whether it has been touched, it is also necessary to perform data processing to find the coordinates of the corresponding sub-channel. The specific process is shown in Figure 13: firstly perform normal pre-stage filtering, and then check whether the sub-channel has water mark, such as water. The mark performs normal data processing. If there is a water mark in the sub-channel, it is for the water state. Perform pre-stage filtering and then perform normal data processing. If there is a mark, such as an anhydrous mark, the coordinate data of the sub-channel is reported. Otherwise, after the water-data sub-channel is subjected to the post-processing of the water data, the coordinate data of the sub-channel is reported.

The connection relationship between a plurality of column channels, a bus bar, a scanning module, and the like is as shown in FIGS.

The TFT (Thin-film transistor), the common voltage driving 埠 and the sensing electrode of the embedded self-capacitive touch display device are generally disposed on the same layer, and the TFTs of the plurality of In-cell self-capacitive capacitive screens are generally set to In the TFT array, a TFT array layer is disposed between the TFT array glass and the liquid crystal layer.

This setting method can scan all the sensing electrodes at the same time by sharing one Vcom interface. The scanning time is short and the scanning frequency is high, which can be integrated into the IC for touch or LCD driving. Suitable for MIPI, I2C and SPI.

There are two options for the connection between TFT and Vcom: single layer and double layer.

In the single layer scheme, as shown in FIG. 14, the connection line between the TFT and the Vcom in the TFT array is in contact with the surface of the TFT, that is, the connection line between the TFT and the TFT and the Vcom is in the same plane. : The thickness of the In-cell self-capacitive capacitive screen can be reduced, and the disadvantage is that the TFTs in the same row are equal in length in the longitudinal direction, and in the lateral direction, since a plurality of connecting lines are required to be arranged in parallel with the TFT, the closer to the Vcom TFT The smaller the width in the lateral direction, the smaller the control area of the liquid crystal is, that is, if the electrical parameters of different TFTs are the same, and the areas of different TFTs are different, the area of the liquid crystal that can be controlled is different, so that the In-cell self-capacitance capacitor The screen has uneven illumination, and the precision of the operation of the lead is very high. The process is difficult and can be directly transmitted through High etching precision is achieved by the etching process.

In the two-layer scheme, as shown in FIG. 15, the connection line between the TFT and the Vcom in the TFT array is electrically connected to the TFT through the insulating layer, that is, the TFT and the connection line between the TFT and the Vcom are in two different planes. It is necessary to plate an insulating layer on the surface of the TFT and conduct the hole through the hole. The advantage of this method is that the area of each TFT can be completely the same, and the built-in self-capacitive touch display device has uniform illumination, and the disadvantages are: Since the area of the TFT is very small, the surface of the TFT is electrically connected to the connecting line through the insulating layer, and the process is very difficult.

In summary, the in-cell self-capacitive touch display device and the water detecting method provided by the embodiments of the present invention realize that a water detecting scan frame is added in a normal scanning period, and a part of the channel is grounded after the water detecting scanning frame is realized. For the effective detection of water in another part of the channel, it is judged whether the sub-channel is in a water state by comparing the change of the capacitance value before and after the sub-channel is grounded. The water detection scan frame is used to obtain an accurate water state, and then the data is post-processed to improve the accuracy of the water operation.

The in-cell self-capacitive touch display device and the water detecting method provided by the present invention are described in detail above. The principles and embodiments of the present invention have been described herein with reference to specific examples, and the description of the above embodiments is only to assist in understanding the method of the present invention and its core idea. It is to be noted that a number of modifications and variations of the present invention may be made without departing from the spirit and scope of the invention.

Steps 10~30: Steps for water detection method of embedded self-capacitive touch display device

Claims (10)

An in-cell self-capacitive touch display device water detecting method comprises: dividing all column channels of a full screen into multi-component channels, performing touch scanning on the sub-channels, each group of the sub-channels comprising at least one column of channels, each The scan period includes a normal touch scan frame and a water detection scan frame. The normal touch scan frame and the water detection scan frame respectively set a touch reference value, and compare the normal touch scan frame data collected in each scan period. And the change amount of the touch reference value is set separately from the water detection scan frame data; in the normal touch state, the change amount of the normal touch scan frame data and the water detection scan frame data relative to the respective touch reference values are greater than a threshold; In the state of water droplets, the change amount of the normal touch scan frame data of the sub-channel covered by the water is smaller than the threshold value compared with the set touch reference value, and the change amount of the water detection scan frame data relative to the set touch reference value is greater than Threshold; and processing the capacitance value data of the sub-channel covered by water to remove interference of water droplets on the capacitance value of the sub-channel covered by water The normal touch scan frame is a touch scan performed on all the sub-channels, and the water detection scan frame is an interval scan performed on the sub-channel, that is, one of the adjacent two adjacent sub-channels, one of the points The channel performs normal touch scanning and the other sub-channel is grounded. The in-cell self-capacitive touch display device water detecting method according to claim 1, wherein each of the scanning periods includes two of the normal touch scanning frames and one of the water detecting scanning frames. The method for detecting water in a self-capacitive touch display device according to claim 2, wherein each of the scanning periods is performed after two normal touch scanning frames are completed Scan the frame. The in-cell self-capacitive touch display device water detecting method according to claim 2, wherein the water detecting scanning frame is between the two normal touch scanning frames. The in-cell self-capacitive touch display device water detecting method according to claim 1, wherein at least one of the water detecting scanning frames is located between two adjacent normal touch scanning frames. The in-cell self-capacitive touch display device water detecting method according to claim 1, wherein each of the scanning periods further includes a secondary water detecting scanning frame, wherein the sub-channel of the second water detecting scanning frame is closed The first water detection scans the normal touch scan channel of the frame. The method for detecting water in the embedded self-capacitive touch display device according to claim 6, wherein the first water detection scan frame is an internal odd ground channel and an odd-numbered channel is scanned, and the second water detection is performed. The scan frame is a scan of the even sub-channel after the odd-numbered channel is grounded. The in-cell self-capacitive touch display device water detecting method according to any one of claims 1 to 7, wherein the plurality of sets of the sub-channels have the same number of column channels. An in-cell self-capacitive touch display device includes: a scan module for scanning a sub-channel of a designated screen, one scan period including a normal touch scan frame and a water detection scan frame; and data analysis The module, the normal touch scan frame and the water detection scan frame respectively set a touch reference value, and the data analysis module compares the normal touch scan frame data and the water detection scan frame data collected in each scan period. Setting the amount of change of the touch reference value; the change of the normal touch scan frame data and the water detection scan frame data relative to the respective touch reference values under the normal touch state The amount is greater than the threshold; in the case of isolated water droplets, the normal touch scan frame data of the sub-channel covered by water is smaller than the set touch reference value generated by the water detection scan frame data relative to the set touch reference value The data analysis module processes the capacitance value data of the sub-channel covered by the water to remove the interference of the water droplets on the capacitance value of the sub-channel covered by the water; wherein the normal touch scan frame is All of the sub-channels are scanned, and the water detection scan frame is an interval scan of the sub-channel, that is, any two adjacent sub-channels, one of the sub-channels performs normal touch scanning, and the other sub-channel Ground. The embedded self-capacitive touch display device of claim 9, further comprising a scan control module, configured to allocate the number of column channels included in the subchannel and control the corresponding subchannel Closed and opened.