CN107045401B - Embedded self-contained touch display device and water detection method - Google Patents
Embedded self-contained touch display device and water detection method Download PDFInfo
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- CN107045401B CN107045401B CN201610084026.8A CN201610084026A CN107045401B CN 107045401 B CN107045401 B CN 107045401B CN 201610084026 A CN201610084026 A CN 201610084026A CN 107045401 B CN107045401 B CN 107045401B
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
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Abstract
The invention discloses a water detection method and a detection device for an embedded self-contained touch display device, wherein the water detection method comprises the following steps: scanning multi-component channels dividing all the line channels of the full screen, wherein each component channel comprises at least one line of channel, and one scanning period of scanning comprises a normal touch scanning frame and a water detection scanning frame; comparing the capacitance value of the sub-channel in the normal touch scanning frame with the capacitance value in the water detection scanning frame; when the difference value between the capacitance value in the water detection scanning frame of the sub-channel and the capacitance value in the normal touch scanning frame is larger than a preset value, the sub-channel is a sub-channel covered by water, otherwise, the sub-channel is a water-free channel; processing the capacitance value data of the sub-channel covered by water; the normal touch scanning frame is used for scanning all sub-channels, and the water detection scanning frame is used for scanning other sub-channels after odd (or even) sub-channels are grounded. By adding a water detection scan frame, the accuracy of the water operation is improved.
Description
Technical Field
The invention relates to the field of touch screen control, in particular to an embedded self-contained touch display device and a water detection method.
Background
The self-capacitance screen detects the earth capacitance of each channel, so that no touch variable quantity exists for isolated water, and even if water exists, the influence on other places of the touch screen can not be influenced, as shown in fig. 1 and fig. 2, in the existing scanning, two scanning frames exist in one scanning period, but when water drops exist on the self-capacitance screen, the positions of the water drops can not be detected, but when fingers touch on water, the water communicated with the fingers can form an equipotential surface, so that the touch area is larger than that of real fingers, and the control accuracy is reduced.
Disclosure of Invention
The invention aims to provide an embedded self-contained touch display device and a water detection method, which improve the accuracy of water-carrying operation.
In order to solve the above technical problem, an embodiment of the present invention provides a water detection method for an embedded self-contained touch display device, including:
dividing all the line channels of the full screen into multi-component channels, and performing touch scanning on the sub-channels, wherein each group of sub-channels comprises at least one line of channels, and each scanning period comprises a normal touch scanning frame and a water detection scanning frame;
the normal touch scanning frame and the water detection scanning frame are respectively set with a touch reference value, and the normal touch scanning frame data and the water detection scanning frame data acquired in each scanning period are compared with the variation of the respective set touch reference values; under a normal touch state, the variation of the normal touch scanning frame data and the variation of the water detection scanning frame data relative to respective touch reference values are both larger than a threshold value; in the state of isolated water drops, the variation of the normal touch scanning frame data of the sub-channel covered by water relative to the set touch reference value is smaller than the threshold, and the variation of the water detection scanning frame data relative to the set touch reference value is larger than the threshold;
processing the capacitance value data of the sub-channel covered by water, and removing the interference of water drops on the capacitance value of the sub-channel covered by water;
the normal touch scanning frame is touch scanning performed on all the subchannels, and the water detection scanning frame is interval scanning performed on the subchannels, that is, one subchannel performs normal touch scanning and the other subchannel is grounded in any two adjacent subchannels.
Wherein each scanning period comprises two normal touch scanning frames and one water detection scanning frame.
And each scanning period is that after two normal touch scanning frames are completed, one water detection scanning frame is carried out.
Wherein the water detection scan frame is between the two normal touch scan frames.
And at least one water detection scanning frame is positioned between two adjacent normal touch scanning frames.
Each scanning period further comprises a secondary water detection scanning frame, and the sub-channel closed by the secondary water detection scanning frame is a normal touch scanning channel of the primary water detection scanning frame.
The water detection scanning frame is used for scanning odd subchannels after the internal parts of even subchannels are grounded, and the secondary water scanning frame is used for scanning the even subchannels after the odd subchannels are grounded.
And the number of the row channels of the plurality of groups of the branch channels is equal.
In addition, an embodiment of the present invention further provides an embedded self-contained touch display device, including:
the scanning module is used for scanning the sub-channels of the appointed screen, and one scanning period comprises a normal touch scanning frame and a water detection scanning frame;
the data analysis module compares the variation of the normal touch scanning frame data and the water detection scanning frame data acquired in each scanning period relative to the respective set touch reference values; under a normal touch state, the variation of the normal touch scanning frame data and the variation of the water detection scanning frame data relative to respective touch reference values are both larger than a threshold value; in the state of isolated water drops, the variation of the normal touch scanning frame data of the sub-channel covered by water relative to the set touch reference value is smaller than the variation of the water detection scanning frame data relative to the set touch reference value; the data analysis module is used for processing the capacitance value data of the sub-channel covered by the water to remove the interference of water drops on the capacitance value of the sub-channel covered by the water;
the normal touch scanning frame is used for scanning all the subchannels, and the water detection scanning frame is used for scanning the subchannels at intervals, namely, one subchannel performs normal touch scanning and the other subchannel is grounded in any two adjacent subchannels.
The device also comprises a scanning control module, wherein the scanning control module is used for distributing the number of the row channels contained in the sub-channels and controlling the closing and opening of the corresponding sub-channels.
Compared with the prior art, the embedded self-contained touch display device and the water detection method provided by the embodiment of the invention have the following advantages:
according to the embedded self-contained touch display device and the water detection method, the water detection scanning frame is added in a normal scanning period, after one part of sub-channels are grounded during the water detection scanning frame, effective detection of the other part of channels on water is realized, and whether the sub-channels are in a water state or not is judged by comparing the change of capacitance values before and after the sub-channels are grounded. The accurate water state is obtained through the water detection scanning frame, and then the data is post-processed to improve the accuracy of the water operation.
In summary, the embedded self-contained touch display device and the water detection method provided by the embodiment of the invention improve the accuracy of the water-carrying operation by adding the water detection scanning frame.
Drawings
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 description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a touch display scanning waveform in the prior art;
FIG. 2 is a table showing capacitance values of some row channels during touch scanning when water drops exist in the prior art;
FIG. 3 is a schematic diagram of a circuit structure when water drops are formed on two adjacent channels according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an equivalent circuit of a sub-channel for water detection according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a touch display scanning waveform in the water detection method of the embedded self-contained touch display device according to the embodiment of the invention;
fig. 6 shows capacitance values of a part of channels in a single water detection scan in the method for detecting water in an embedded self-contained touch display device according to an embodiment of the present invention;
fig. 7 is a flowchart illustrating a water detection method for an embedded self-contained touch display device according to an embodiment of the present invention;
fig. 8 is a capacitance data diagram of a single channel during normal touch in the method for detecting water in an embedded self-contained touch display device according to the embodiment of the invention;
fig. 9 is a capacitance data diagram of a single channel when water drops occur in the water detection method of the embedded self-contained touch display device according to the embodiment of the invention;
fig. 10 is a schematic diagram illustrating component connections of an embedded self-contained touch display device according to an embodiment of the invention;
fig. 11 is a flowchart illustrating a working mode of an embedded self-contained touch display device according to an embodiment of the present invention;
fig. 12 is a logic flow diagram of a drop processing performed by software in the embedded self-contained touch display device according to the embodiment of the invention:
fig. 13 is a schematic diagram illustrating a step of removing water droplet interference by using software in the embedded self-contained touch display device according to the embodiment of the invention;
FIG. 14 is a schematic view illustrating another position relationship of an embedded self-contained touch display device on a screen according to an embodiment of the invention;
fig. 15 is a schematic view illustrating another position relationship of the embedded self-contained touch display device provided by the embodiments of the invention on the screen.
Detailed Description
As described in the background section, in the embedded self-capacitance screen in the prior art, because the capacitance to ground of each channel is detected, there is no touch variation to isolated water, and even if there is water, the touch screen is not affected at other places, but when a finger touches on water, the water communicated with the finger forms an equipotential surface, so that the touch area is larger than that of a real finger, and the control accuracy is reduced.
Accordingly, an embodiment of the present invention provides a water detection method for an embedded self-contained touch display device, including:
dividing all the line channels of the full screen into multi-component channels, and performing touch scanning on the sub-channels, wherein each group of sub-channels comprises at least one line of channels, and each scanning period comprises a normal touch scanning frame and a water detection scanning frame;
the normal touch scanning frame and the water detection scanning frame are respectively set with a touch reference value, and the normal touch scanning frame data and the water detection scanning frame data acquired in each scanning period are compared with the variation of the respective set touch reference values; under a normal touch state, the variation of the normal touch scanning frame data and the variation of the water detection scanning frame data relative to respective touch reference values are both larger than a threshold value; in the state of isolated water drops, the variation of the normal touch scanning frame data of the sub-channel covered by water relative to the set touch reference value is smaller than the threshold, and the variation of the water detection scanning frame data relative to the set touch reference value is larger than the threshold;
processing the capacitance value data of the sub-channel covered by water, and removing the interference of water drops on the capacitance value of the sub-channel covered by water;
the normal touch scanning frame is touch scanning performed on all the subchannels, and the water detection scanning frame is interval scanning performed on the subchannels, that is, one subchannel performs normal touch scanning and the other subchannel is grounded in any two adjacent subchannels.
In addition, an embodiment of the present invention provides an embedded self-contained touch display device, including:
the scanning module is used for scanning the sub-channels of the appointed screen, and one scanning period comprises a normal touch scanning frame and a water detection scanning frame;
the data analysis module is used for comparing the variation of the normal touch scanning frame data and the water detection scanning frame data acquired in each scanning period with the respective set touch reference values; under a normal touch state, the variation of the normal touch scanning frame data and the variation of the water detection scanning frame data relative to respective touch reference values are both larger than a threshold value; in the state of isolated water drops, the variation of the normal touch scanning frame data of the sub-channel covered by water relative to the set touch reference value is smaller than the variation of the water detection scanning 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 water drops on the capacitance value of the sub-channel covered by the water;
the normal touch scanning frame is used for scanning all the subchannels, and the water detection scanning frame is used for scanning the subchannels at intervals, namely, one subchannel performs normal touch scanning and the other subchannel is grounded in any two adjacent subchannels.
It should be noted that the water detection scanning frame in the embodiment of the present invention may be scanning performed on other subchannels after grounding a part of subchannels, specifically, water detection is performed on even subchannels after an odd subchannel is short-circuited to ground; and the water detection can be realized for the odd sub-channels after the even sub-channels are short-circuited to the ground.
As shown in FIG. 3, channel SX1 has its own capacitance to ground of C1The capacitance of the channel SX2 to ground is C2When water drops are present between the passages SX1 and SX2, the capacitance formed by the water drops in the passages SX1 and SX2 is C3Then, the channel SX2 is shorted to ground, and as shown in FIG. 4, after the channel SX2 is shorted to ground, the equivalent capacitance C of the channel SX1eqIs equal to the capacitance C2And C3Connected in series and then connected with a capacitor C1And (4) carrying out parallel connection on the capacitance values. It can be found that the equivalent capacitance is obviously greater than the self ground capacitance of the channel SX1, so that when the ground capacitance of normal touch scanning and the ground capacitance of SX1 after waterproof scanning after the channel SX2 is short-circuited to ground can be compared through the channel SX1, and under the condition that water covers more than two adjacent channels, the opened channel is bridged to the grounded channel through water, additional capacitance is equivalently introduced, so that the total equivalent ground capacitance value of the scanning channel changes, the change is detected through scanning, the detection of water is realized, and then the data are processed through software, for example, data processing is carried out by adopting a Firmware software algorithm, data exceeding a threshold value is screened out, the water on the channel corresponding to the data is judged, and water covered branch communication ware is detectedThe adopted data calculation method can avoid the problem of control accuracy reduction caused by the fact that the touch area is larger than that of a real finger after water communicated by the finger forms an equipotential surface. This scheme reducible or eliminate the influence of water droplet to the touch-control precision promptly, improve the accuracy of taking water operation, realize under the prerequisite that the screen has the water droplet, realize the accurate touch-control to the screen.
In the scanning process, because the Source line (signal electrode line) and the Gate line (scanning electrode line) can simultaneously transmit the same excitation signal, the common electrode (V for short) with the display electrode can be eliminatedcom) Resulting in coupling capacitance and thus improved scanning accuracy.
In summary, in the embedded self-contained touch display device and the water detection method provided in the embodiments of the present invention, the scan frame is detected by adding water in the normal scan cycle, after one part of the sub-channels is grounded during the scan frame is detected by water, effective detection of water in the other part of the channels is realized, and whether the sub-channels are in the water-containing state is determined by comparing changes of capacitance values before and after the sub-channels are grounded. The accurate water state is obtained through the water detection scanning frame, and then the data is post-processed to improve the accuracy of the water operation.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, specific details are set forth in order to provide a thorough understanding of the present invention. The invention can be implemented in a number of ways different from those described herein and similar generalizations can be made by those skilled in the art without departing from the spirit of the invention. The invention is therefore not limited to the specific implementations disclosed below.
Referring to fig. 5, 6 and 7, fig. 5 is a schematic diagram of a touch display scanning waveform in a water detection method of an embedded self-contained touch display device according to an embodiment of the present invention; fig. 6 shows capacitance values of a part of channels in a single water detection scan in the method for detecting water in an embedded self-contained touch display device according to an embodiment of the present invention; fig. 7 is a flowchart illustrating a water detection method of an embedded self-contained touch display device according to an embodiment of the present invention.
Fig. 5 shows that in a scanning period, two normal touch scanning frames and one water detection scanning frame are included, the scanning period is the same as that in the prior art, and the scanning duration of each normal touch scanning frame and each water detection scanning frame may also be the same.
As can be seen from fig. 6, the capacitance values at 12 positions of Chy10, Chy11, Chy12 and Chy13 of rows Chx08, Chx10, Chx12 are significantly larger than those at other positions, and since the capacitance values of each minimum cell at other positions are substantially equal, it is known that the capacitance values at these positions on the screen have changed due to external causes, most likely due to the fact that these positions are due to the presence of water droplets, while the difference in magnitude of the capacitance values at different positions is due to the difference in the thickness of the water droplets at that position, even if the presence of isolated water droplets on the screen is detected in this way.
In one embodiment, as shown in fig. 7, the method for detecting water in an in-cell touch display device includes:
step 30, processing the capacitance value data of the sub-channel covered by water, and removing the interference of water drops on the capacitance value of the sub-channel covered by water;
the normal touch scanning frame is touch scanning performed on all the subchannels, and the water detection scanning frame is interval scanning performed on the subchannels, that is, one subchannel performs normal touch scanning and the other subchannel is grounded in any two adjacent subchannels.
According to the water detection method of the embedded self-contained touch display device, the water detection scanning frame is added in a normal scanning period, and after one part of channels are grounded during the water detection scanning frame, effective detection of the other part of channels on water is realized. The accurate water state is obtained through the water detection scanning frame, 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 drop may completely cover one subchannel or may cover a part of the subchannel, but only covers a very small part of the subchannel, even if the water-carrying operation is performed, the actual effect is very limited, so a threshold value is generally set, that is, when the change of the capacitance value of the subchannel is greater than the threshold value, it is indicated that the water-carrying operation has a large influence on normal touch, otherwise, the change of the capacitance value of the subchannel may be ignored.
The scanning frequency of the invention preferably adopts the common frequency of 60Hz of the current electronic equipment, and the point reporting rate is not influenced by adding water detection scanning frames in one scanning period. The present invention is applicable to any frequency. It should be noted that: the duration of the water detection scanning frame cannot be too short, otherwise, the water detection scanning cannot be completed for all the sub-channels, the duration of the water detection scanning frame in one period cannot be too long, otherwise, the duration of the normal touch scanning frame is relatively shortened, the report rate is affected, the normal touch scanning is to scan all the sub-channels, and is mainly to scan touch, so the normal touch scanning is very important, and therefore, enough data and data processing time need to be obtained to enable the touch to be accurate. Generally, one period of the scanning includes two normal touch scanning frames and one water detection scanning frame. It should be noted that, the number of the scanning frames in one scanning period is not limited, and in order to ensure the accuracy of the waterproof detection and the accuracy of the normal touch scanning, one scanning period includes three scanning frames, two normal touch scanning frames and one water detection scanning frame, and the time length of each scanning frame may be the same or different, but in order to reduce the processing difficulty of data and the scanning difficulty, the time length of each scanning frame is the same.
The water detection judgment logic of the water detection method of the embedded self-contained touch display device is as follows:
the water detection judgment logic is illustrated by taking an example that one scanning period comprises two normal touch scanning frames and one water detection scanning frame: recording two normal touch scanning frames as an A frame and a B frame respectively, and recording a water detection scanning frame as a C frame: A. b, C frames have independent touch reference values (Baseline), which are denoted as BaseA, BaseB, BaseC. Raw data (Rawdata) collected from each frame scan are respectively marked as RawA, RawB and RawC, and the respective Rawdata and Baseline are compared to obtain the variation (Diff) of each scan, and the variation is marked as DiffA, DiifB and DiffC.
When touched normally, i.e., when there is a conductor such as a finger touching, DiffA, DiffB, and DiffC all produce a variation greater than a threshold, as shown in fig. 8. Whereas the water drop induced change characteristics are essentially no change in DiffA versus DiffB for the water covered subchannels, DiffC will change significantly as shown in fig. 9.
The touch reference value and the threshold used in A, B, C frames may be the same or different.
In order to improve the detection precision of water drops on a screen and improve the accuracy of water carrying operation, one scanning period also comprises a secondary water detection scanning frame, the sub-channel closed by the secondary water detection scanning frame is a normal touch scanning channel of a first water detection scanning frame, namely, a common water detection scanning frame is opposite to the channel opened and closed by the secondary water detection scanning frame. And as shown, the water detection scanning frame is used for scanning even component channels after odd component channels are grounded. And the secondary water detection scanning frame is used for scanning the odd component channels after the even component channels are grounded. Therefore, in one scanning period, the odd component channel and the even component channel are scanned twice in three scanning frames, and are short-circuited to the ground once, so that the water detection accuracy is improved.
The multiple sub-channels can consider different numbers of lines of each sub-channel, but the effective water detection premise is that water drops are required to cover at least one channel with normal touch scanning and grounding, so an interlaced scanning mode is preferentially adopted, and the water drops with smaller diameter can be detected as far as possible.
If the number of the row channels contained in the sub-channels is large, and the water drops are small, even if a water detection scanning frame is added in the scanning process, the change of the capacitance value of the sub-channels is not obvious in normal touch scanning and waterproof scanning, the distinguishing difficulty is large, and even the sub-channels cannot be distinguished, so that the scanning precision is improved, the water carrying operation precision is improved, and the sub-channels only contain one row channel.
For the position relationship between the water detection scanning frame and the normal touch scanning frame, generally, each scanning period is two normal touch scanning frames, and then one water detection scanning frame is performed, or the water detection scanning frame is between the two normal touch scanning frames, so that the report points are uniform, and the blank area connected between two display frames is avoided, and the blank area is referred to as a blank frame for short.
If a scanning period includes a plurality of water detection scanning frames, there may be no water detection scanning frame between two consecutive normal touch scanning frames, or at least one water detection scanning frame is located between two adjacent normal touch scanning frames.
In order to reduce the operation amount and improve the scanning operation efficiency, the number of the row channels of the plurality of groups of the subchannels is equal.
It should be noted that the number of the row channels included in the subchannel is not specifically limited, and if the width of the row channel is very small, the number of the row channels in the subchannel can be appropriately increased, and in addition, a scanning mode that a larger number of the row channels are included in the subchannel and a smaller number of the row channels are included in the subchannel may be used, that is, the subchannel is scanned in a mode that the number of the row channels included in the subchannel is larger, the position where the water drop exists is found, then the number of the row channels in the subchannel is reduced, the found subchannel in which the water drop exists is finely scanned, and then subsequent data processing is performed, so that the accuracy of water detection is improved, and the accuracy of water carrying operation is improved.
In addition, an embodiment of the invention further provides an embedded self-contained touch display device, as shown in fig. 10, including:
the scanning module 10 is used for scanning the sub-channels of the designated screen, and one scanning period comprises a normal touch scanning frame and a water detection scanning frame;
the data analysis module 20 is configured to set a touch reference value for each of the normal touch scan frame and the water detection scan frame, and the data analysis module 20 compares variation amounts of the normal touch scan frame data and the water detection scan frame data acquired in each scan period with respect to the respective set touch reference values; under a normal touch state, the variation of the normal touch scanning frame data and the variation of the water detection scanning frame data relative to respective touch reference values are both larger than a threshold value; in the state of isolated water drops, the variation of the normal touch scanning frame data of the sub-channel covered by water relative to the set touch reference value is smaller than the variation of the water detection scanning frame data relative to the set touch reference value; the data analysis module is used for processing the capacitance value data of the sub-channel covered by the water to remove the interference of water drops on the capacitance value of the sub-channel covered by the water;
the normal touch scanning frame is used for scanning all the subchannels, and the water detection scanning frame is used for scanning the subchannels at intervals, namely, one subchannel performs normal touch scanning and the other subchannel is grounded in any two adjacent subchannels.
The working mode of the in-cell self-contained touch display device is shown in the step flow chart of fig. 11:
the method comprises the steps of firstly carrying out normal scanning, then carrying out water detection scanning, marking related sub-channels covered by water, then carrying out normal data processing, switching to normal scanning on the sub-channels without water marks, and carrying out corresponding post-processing on the sub-channels with water marks according to water data, so that the influence of water drops on touch is removed, and the accuracy of touch with water is improved.
The logic for performing the water droplet treatment using the software is shown in fig. 12:
entering software to process water drop logic, then carrying out normal scanning to see whether there is induction, if there is induction, then carrying out water detection scanning frame to see whether there is induction, if there is induction, then setting water mark for corresponding sub-channel, otherwise, carrying out normal data processing to judge that the channel has no any touch.
After determining whether the touch is made, data processing is further required to find out the coordinates of the corresponding sub-channels, and the specific process is as shown in fig. 13:
carrying out normal pre-stage filtering, then checking whether the subchannel has a water mark, if the subchannel has no water mark, carrying out normal data processing, if the subchannel has the water mark, carrying out pre-stage filtering aiming at a water state, and then carrying out normal data processing; and then checking whether the sub-channel has a mark, if the sub-channel has no water mark, reporting the coordinate data of the sub-channel, otherwise, after the sub-channel with the water mark is subjected to water data post-processing, reporting the coordinate data of the sub-channel.
The connection relationship of a plurality of row channels with buses, scanning modules and the like is shown in fig. 14 and 15.
The Thin-film transistor (TFT), the common voltage driving port and the sensing electrode of the embedded self-contained touch display device are generally disposed on the same layer, and the TFTs of the In-cell self-contained capacitive screen are generally disposed as a TFT array, and the TFT array layer is disposed between the TFT array glass and the liquid crystal layer.
The arrangement is such that one V is sharedcomThe interface can scan all the induction electrodes simultaneously, the scanning time is short, the scanning frequency is high, and the interface can be integrated into an IC (integrated circuit) for touch control or LCD (liquid crystal display) driving. Is suitable for MIPI and I2C and SPI.
And TFT and VcomThere are generally two schemes for connection between them: single layer and double layer.
In the single layer scheme, the TFTs and V in the TFT array are in the same column as shown in FIG. 14comIs in contact with the surface of the TFT, i.e. TFT and VcomThe connecting lines are in the same plane, and the mode has the advantages that: the thickness of the In-cell self-capacitance capacitive screen can be reduced, and the defects are as follows: the TFTs in the same column are equal in length in the longitudinal direction, and are closer to V in the transverse direction due to the need for a plurality of connecting lines arranged in parallel with the TFTscomThe smaller the width of the TFT In the transverse direction is, the smaller the control area of the liquid crystal is, namely if the electrical parameters of different TFTs are the same and the areas of different TFTs are different, the controllable areas of the liquid crystal are different, so that the In-cell self-capacitance capacitive screen has the advantages of nonuniform light emission, very high operation precision of a lead wire, high process difficulty and capability of being directly realized through an etching process with high etching precision.
In the two-layer scheme, the TFTs and V in the TFT array are in the same column as shown in FIG. 15comIs conducted with the TFT through an insulating layer, i.e. the TFT and VcomThe connecting wire in two different planes, need to plate a layer of insulating layer to the TFT surface, switch on with the connecting wire through the mode of digging the hole, the advantage of this kind of mode is: the area of each TFT can be the same completely, and the light-emitting of embedded self-contained touch display device is even, and the shortcoming is: because the area of the TFT is very small, the TFT surface penetrates through the insulating layer to be conducted with the connecting line, and the process difficulty is very high.
In summary, in the embedded self-contained touch display device and the water detection method provided in the embodiments of the present invention, the scan frame is detected by adding water in the normal scan cycle, after one part of the channels is grounded during the scan frame is detected by water, effective detection of water in the other part of the channels is realized, and whether the sub-channels are in the water-containing state is determined by comparing changes of capacitance values before and after the sub-channels are grounded. The accurate water state is obtained through the water detection scanning frame, and then the data is post-processed to improve the accuracy of the water operation.
The embedded self-contained touch display device and the water detection method provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A water detection method for an embedded self-contained touch display device is characterized by comprising the following steps:
dividing all the line channels of the full screen into multi-component channels, and performing touch scanning on the sub-channels, wherein each group of sub-channels comprises at least one line of channels, and each scanning period comprises a normal touch scanning frame and a water detection scanning frame;
the normal touch scanning frame and the water detection scanning frame are respectively set with a touch reference value, and the normal touch scanning frame data and the water detection scanning frame data acquired in each scanning period are compared with the variation of the respective set touch reference values; under a normal touch state, the variation of the normal touch scanning frame data and the variation of the water detection scanning frame data relative to respective touch reference values are both larger than a threshold value; in the state of isolated water drops, the variation of the normal touch scanning frame data of the sub-channel covered by water relative to the set touch reference value is smaller than the threshold, and the variation of the water detection scanning frame data relative to the set touch reference value is larger than the threshold;
processing the capacitance value data of the sub-channel covered by water, and removing the interference of water drops on the capacitance value of the sub-channel covered by water;
the normal touch scanning frame is touch scanning performed on all the subchannels, and the water detection scanning frame is interval scanning performed on the subchannels, that is, one subchannel performs normal touch scanning and the other subchannel is grounded in any two adjacent subchannels.
2. The method of claim 1, wherein each scan cycle comprises two normal touch scan frames and one water detection scan frame.
3. The method of claim 2, wherein each scanning cycle is performed after two normal touch scan frames are completed.
4. The method of claim 2, wherein the water detection scan frame is between two normal touch scan frames.
5. The method of claim 1, wherein at least one water detection scan frame is located between two adjacent normal touch scan frames.
6. The method as claimed in claim 1, wherein each of the scan cycles further comprises a secondary water detection scan frame, and the sub-channel closed by the secondary water detection scan frame is a normal touch scan channel of a first water detection scan frame.
7. The method as claimed in claim 6, wherein the water detection scan frame is a scan of an odd subchannel after grounding inside an even subchannel, and the secondary water scan frame is a scan of the even subchannel after grounding the odd subchannel.
8. The method for detecting water in an in-cell self-contained touch display device of any one of claims 1-7, wherein the number of row channels of the plurality of component channels is equal.
9. An embedded self-contained touch display device, comprising:
the scanning module is used for scanning the sub-channels of the appointed screen, and one scanning period comprises a normal touch scanning frame and a water detection scanning frame;
the data analysis module compares the variation of the normal touch scanning frame data and the water detection scanning frame data acquired in each scanning period relative to the respective set touch reference values; under a normal touch state, the variation of the normal touch scanning frame data and the variation of the water detection scanning frame data relative to respective touch reference values are both larger than a threshold value; in the state of isolated water drops, the variation of the normal touch scanning frame data of the sub-channel covered by water relative to the set touch reference value is smaller than the variation of the water detection scanning frame data relative to the set touch reference value; the data analysis module is used for processing the capacitance value data of the sub-channel covered by the water to remove the interference of water drops on the capacitance value of the sub-channel covered by the water;
the normal touch scanning frame is used for scanning all the subchannels, and the water detection scanning frame is used for scanning the subchannels at intervals, namely, one subchannel performs normal touch scanning and the other subchannel is grounded in any two adjacent subchannels.
10. The in-cell self-contained touch display device of claim 9, further comprising a scan control module for allocating the number of row lanes included in the sub-lanes and controlling the corresponding sub-lanes to be closed and opened.
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| CN108428331A (en) * | 2018-03-06 | 2018-08-21 | 深圳市沃特沃德股份有限公司 | Soaked alarm method and device |
| WO2019196116A1 (en) | 2018-04-13 | 2019-10-17 | 深圳市汇顶科技股份有限公司 | Touch detection chip, and method for detecting touch screen |
| CN111610872B (en) * | 2019-02-26 | 2023-07-07 | 敦泰电子有限公司 | Touch control method, circuit system and touch device |
| CN111078046B (en) * | 2019-12-05 | 2022-04-08 | 北京集创北方科技股份有限公司 | Detection method and device and electronic equipment |
| CN111459346B (en) | 2020-03-31 | 2021-09-07 | 深圳市汇顶科技股份有限公司 | Capacitive touch device and gesture recognition method, chip and storage medium thereof |
| CN113514673B (en) * | 2021-09-14 | 2022-01-28 | 苏州华兴源创科技股份有限公司 | Touch channel switching circuit, device and detection system |
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