WO2019023882A1

WO2019023882A1 - Touch detection method and apparatus, touchscreen and electronic terminal

Info

Publication number: WO2019023882A1
Application number: PCT/CN2017/095267
Authority: WO
Inventors: 姜海宽; 彭永豪; 刘松松; 杨威
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2017-07-31
Filing date: 2017-07-31
Publication date: 2019-02-07
Also published as: CN107624176A; CN107624176B

Abstract

A touch detection method and apparatus, a touchscreen and an electronic terminal, wherein the touch detection method comprises: acquiring a capacitance value of a capacitor node of a touchscreen at a first frame and a capacitance value at a second frame; determining, according to the capacitance value at the first frame and the capacitance value at the second frame, an alternative standard value for said touchscreen; determining whether said alternative standard value matches a pre-stored original standard value for said touchscreen; and if said alternative standard value matches the pre-stored original standard value, determining said alternative standard value as being a stable standard value of the touchscreen, wherein said stable standard value is a determining standard for touch detection. The touch detection method allows the determined stable standard value of the touchscreen to be more accurate.

Description

Touch detection method, device, touch screen and electronic terminal

Technical field

Embodiments of the present invention relate to the field of touch technologies, and in particular, to a touch detection method, device, touch screen, and electronic terminal.

Background technique

With the development of touch technology and terminal technology, more and more terminal devices use touch control for human-computer interaction. At present, the touch screens used in terminal devices mainly include capacitive touch screens and resistive touch screens. Among them, capacitive touch screens have been favored by more and more users for their good definition, light transmittance and touch.

The capacitive touch screen is composed of a touch sensor and a touch controller. The touch sensor is composed of a plurality of capacitor nodes. When there is a touch, the capacitance value of the corresponding capacitor node changes, and the touch controller can determine the corresponding value after detecting the change. Touch the location. In order to distinguish the presence or absence of touch, it is necessary to take the capacitance value of all the capacitor nodes of a certain frame of the touch screen as a reference when no touch is applied. After the reference is established, the touch state can be determined by comparing the capacitance value of the current capacitance node with the reference. Therefore, obtaining a reference of a capacitive node without a touch becomes an important part of touch control using a touch screen.

However, in the actual process of determining the reference of the capacitor node, the capacitance of the touch screen is often changed due to various reasons, such as changes in the environment (for example, the original value of the capacitance of the capacitor node caused by temperature rise or temperature decrease becomes smaller or larger. ), then the existing benchmarks need to be maintained to adapt to the new situation. At present, the maintenance of the existing reference is usually: replacing the current reference with the original capacitance value collected by the full-screen capacitor node at a certain time, but the method of using the original capacitance value for the baseline maintenance is due to the acquisition or determination of the original capacitance value. The current usage scenarios of the touch screen may still differ greatly, so that the above-mentioned capacitance change due to various reasons cannot be applied, and the current actual capacitance reference of the touch screen cannot be effectively approached, so that the determined capacitance reference is not accurate enough.

Summary of the invention

The embodiment of the invention provides a touch detection method, device, touch screen and electronic terminal, so as to solve the problem that the capacitance reference cannot be accurately determined in the capacitance reference determination and maintenance scheme of the existing touch screen.

According to a first aspect of the present invention, a touch detection method includes: acquiring a capacitance value of a capacitance node of a touch screen at a first frame and a capacitance value of a second frame; and according to a capacitance value of the first frame A capacitance value of the second frame determines an alternate reference value of the touch screen; determining whether the candidate reference value matches a pre-stored original reference value of the touch screen; if the alternate reference value and pre-stored The original reference value is matched, and the candidate reference value is determined as a stable reference value of the touch screen, wherein the stable reference value is a judgment reference of touch detection.

According to a second aspect of the present invention, a touch detection apparatus is provided, including: an acquisition module, configured to acquire a capacitance value of a capacitance node of a touch screen in a first frame and a capacitance value of a second frame; And determining, according to the capacitance value of the first frame and the capacitance value of the second frame, an alternative reference value of the touch screen; and a determining module, configured to determine whether the candidate reference value is original with the pre-stored touch screen a reference value matching; a second determining module, configured to determine the candidate reference value as a stable reference value of the touch screen if the candidate reference value matches a pre-stored original reference value, wherein the stable reference value It is the judgment criterion of touch detection.

According to a third aspect of the embodiments of the present invention, a touch screen includes: a touch controller and a touch sensor, the touch controller and the touch sensor being electrically connected; wherein the touch sensor is configured to collect a touch screen a capacitance value of the upper capacitor node; the touch controller is configured to acquire a capacitance value collected by the touch sensor, and perform an operation corresponding to the touch detection method according to the first aspect according to the obtained capacitance value.

According to a fourth aspect of the embodiments of the present invention, there is also provided an electronic terminal comprising the touch screen of the third aspect.

According to a fifth aspect of the present invention, a computer storage medium is provided, the computer readable storage medium storing: a capacitance value of a capacitor node for acquiring a touch screen in a first frame and a capacitance value of a second frame An executable instruction for determining an alternate reference value of the touch screen according to a capacitance value of the first frame and a capacitance value of the second frame; and determining whether the candidate reference value is pre-stored An executable instruction that matches an original reference value of the touch screen; and is executable to determine the candidate reference value as a stable reference value of the touch screen if the alternate reference value matches a pre-stored original reference value An instruction, wherein the stable reference value is a determination criterion of touch detection.

According to the touch detection scheme provided by the embodiment of the present invention, when it is required to determine or maintain the stable reference value of the touch screen, the candidate reference value is determined according to the capacitance values of the capacitive nodes of the touch screen in the first frame and the second frame, and then When the candidate reference value matches the original reference value obtained by the original sampling, the candidate reference value is determined as the stable reference value of the touch screen after the power-on. Through the embodiment of the present invention, the determination and maintenance of the stable reference value are performed in units of capacitor nodes, and the capacitance value of the first frame and the capacitance value of the second frame are compared with the manner that the entire screen adopts the original reference value. The determined alternative reference value is closer to the current actual use scenario of the touch screen, and is more effective to approximate the current actual reference value of the touch screen, so that the determined stable reference value is more accurate.

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 embodiments or the description of the prior art will be briefly described below, obviously, the following The drawings in the description are only some of the embodiments of the present invention, and those skilled in the art can obtain other drawings according to the drawings without any inventive labor.

1 is a flow chart showing the steps of a touch detection method according to a first embodiment of the present invention;

2 is a flow chart showing the steps of a touch detection method according to Embodiment 2 of the present invention;

3 is a flow chart showing the steps of a touch detection method according to Embodiment 3 of the present invention;

4 is a block diagram showing the structure of a touch detecting apparatus according to Embodiment 4 of the present invention;

FIG. 5 is a structural block diagram of a touch detecting apparatus according to Embodiment 5 of the present invention; FIG.

FIG. 6 is a schematic structural diagram of a touch screen according to Embodiment 6 of the present invention.

Detailed ways

The present invention will be clearly and completely described in the following embodiments of the present invention. The described embodiments are only a part of the embodiments of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without departing from the inventive scope are the scope of the embodiments of the present invention.

Embodiment 1

Referring to FIG. 1, a flow chart of steps of a touch detection method according to a first embodiment of the present invention is shown.

The touch detection method of this embodiment includes the following steps:

Step S102: Acquire a capacitance value of the capacitive node of the touch screen in the first frame and a capacitance value of the second frame.

It should be noted that the terms “first frame”, “second frame”, “third frame”, “fourth frame” and the like in the embodiments of the present invention are only used to distinguish different frames, and do not indicate the order. Relationships are also not specific to a frame of the touch screen.

In order to distinguish whether there is a touch or not, the capacitive touch screen needs to take the capacitance value of the capacitor node of a certain frame of the touch screen as a reference when there is no touch, that is, the stable reference value after the power-on and power-on. After determining the stable reference value, when determining whether the capacitive node of a certain frame has a touch, the touch state can be determined by comparing the capacitance value of the capacitance node of the frame with the corresponding stable reference value.

Each of the capacitor nodes has a corresponding capacitance value in a certain frame. In this step, the capacitance values of the capacitive nodes of the touch screen in the first frame and the second frame are respectively obtained, wherein the first frame includes but is not limited to the touch screen. The current frame, the second frame is usually a certain frame before the first frame, the first frame and the second frame may be the next two frames, or may be adjacent but spaced two frames. For example, if the fourth frame is the first frame after power-on, the second frame may be the third frame or the second frame or the first frame. Generally, the first frame may be the current frame of the touch screen, the capacitance value of the frame may be obtained by real-time acquisition processing, and the capacitance value of the second frame may be data collected and stored in the frame preceding the first frame.

Step S104: Determine an alternative reference value of the touch screen according to the capacitance value of the first frame and the capacitance value of the second frame.

As mentioned earlier, each capacitor node has a corresponding capacitance value in each frame, based on each The capacitance value of the capacitor node in the first frame and the capacitance value in the second frame can more accurately approximate the capacitance reference value of the touch screen in some cases, such as when the finger is not off the touch screen when the touch screen is powered on. The capacitance reference value and the capacitance reference value after leaving the touch screen, and so on.

Step S106: determining whether the candidate reference value matches the pre-stored original reference value, and if the candidate reference value matches the pre-stored original reference value, determining the candidate reference value as the stable reference value of the touch screen, if not, returning Step S102 proceeds to acquisition of the next frame data until a stable reference value is obtained.

Among them, the stable reference value is a criterion for judging by touch detection. After determining the stable reference value, when determining whether the touch screen has a touch in a certain frame, comparing the capacitance value of the capacitance node of the frame with the stable reference value, whether the touch screen has a touch detection and determination is implemented.

The original reference value may be a sampled value obtained by sampling the sampling node when the touch screen is in a steady state without touch, and may also be referred to as a backup reference value. For example, when the smart terminal with the touch screen is shipped from the factory, the touch screen capacitor node is sampled, and the obtained sample value is taken as the original reference value.

In general, regardless of changes in the environment, the deviation of the candidate reference value of the touch screen in the absence of touch and other interference states (no interference factors such as water droplets) and the original reference value should be within a reasonable range, that is, the alternative reference value should be Matching with the original reference value, in this case, the candidate reference value can be determined as the stable reference value of the touch screen after the power-on and power-on, and further, the touch detection of the touch screen can be realized according to the stable reference value.

In this embodiment, when it is required to determine or maintain the stable reference value of the touch screen, the candidate reference value is determined according to the capacitance values of the capacitive nodes of the touch screen in the first frame and the second frame, and then the candidate reference value is When the original reference value obtained by the original sampling matches, the candidate reference value is determined as the stable reference value of the touch screen after the power-on. Through the embodiment of the present invention, the determination and maintenance of the stable reference value are performed in units of capacitor nodes, and the capacitance value of the first frame and the capacitance value of the second frame are compared with the manner that the entire screen adopts the original reference value. The determined alternative reference value is closer to the current actual use scenario of the touch screen, and is more effective to approximate the current actual reference value of the touch screen, so that the determined stable reference value is more accurate.

The touch detection method of the present embodiment may be implemented by any suitable device or device having a data processing function, including but not limited to a touch controller.

Embodiment 2

Referring to FIG. 2, a flow chart of steps of a touch detection method according to a second embodiment of the present invention is shown.

The touch detection method of this embodiment includes the following steps:

Step S202: Acquire a capacitance value of the capacitive node of the touch screen in the first frame and a capacitance value of the second frame.

In this step, after the touch screen is powered on, the capacitance values of the capacitor nodes in the first frame and the second frame are obtained. The capacitance of the first frame is the capacitance value of the Nth frame from the power-on time, and N is greater than 2. The first frame can usually be the current frame of the touch screen. For example, if the current frame is the ninth frame, then the first frame is the ninth frame. frame. However, the touch screen will swipe the screen. When the capacitance value of the first frame cannot determine the stable reference value, the capacitor node will continue to judge the capacitance value after the screen is swiped. At this time, the current frame is the latest frame after the screen is swiped. For example, frame 10.

For example, if the capacitance value of the ninth frame does not match the original reference value, it may continue to determine whether the capacitance value of the next frame or the subsequent frames of the ninth frame matches the original reference value. In this case, the frame in which the determination is made becomes the current frame. That is, if the capacitance value of a certain frame does not match the pre-stored original reference value, the display of the touch screen advances one frame, and the next frame that travels to the current frame; or, if the capacitance value of a certain frame If the display does not match the pre-stored original reference value, then the display of the touch screen advances a few frames, and the frame that travels to is the current frame. For example, if the touch screen is determined from the ninth frame to the tenth frame, the tenth frame is the current frame, that is, the first frame, and the ninth frame is the previous frame of the current frame, that is, the second frame; for example, the touch screen is from the first frame. 9 to sequentially proceed to the 14th frame through the 10th, 11th, 12th, and 13th frames, and the 14th frame is the current frame, that is, the first frame, and any one of the 10th to 13th frames may be the second frame.

Since the number of frames at the beginning of the power-on of the touch screen may not be completely stable due to the touch screen circuit, the effective reference value cannot be obtained. Therefore, in the embodiment of the present invention, the frame of the touch screen circuit is stabilized as a standard, and a certain frame after the touch screen circuit is stabilized is obtained. The capacitance value is set to obtain the capacitance value of the ninth frame after the touch panel is powered on. At this moment, the first frame is the ninth frame from the power-on time. However, it should be understood by those skilled in the art that the ninth frame is only an exemplary description. In practical applications, those skilled in the art may specifically set the Nth frame to any appropriate one after the touch screen circuit is stabilized according to actual conditions. The frame is not limited in this embodiment of the present invention.

Optionally, when it is determined that the stable reference value of the touch screen is not acquired and the time period of determining the reference meets the first set period, the capacitance value of the capacitive node of the touch screen at the first frame and the capacitance value of the second frame are acquired. The first setting period may be appropriately set by a person skilled in the art according to actual conditions, for example, setting the time after the display of the touch screen advances several frames, for example, the time after traveling 5 frames forward, or directly After setting 5 frames forward, the capacitance values of the capacitive nodes of the touch screen in the first frame and the second frame are obtained. By setting the first setting period, it can be ensured that the basic reference line (that is, the basic touch operation on the touch screen is not affected, and the touch screen can normally respond to the basic touch operation) makes the capacitance reference gradually approach the actual reference of the touch screen.

In an optional manner of the embodiment of the present invention, if the acquired capacitance value of the first frame matches the pre-stored original reference value, the capacitance value of the first frame may be directly determined as the stable reference value of the touch screen.

However, in the case where there is foreign matter pressing on the touch screen, water droplets, and the like, the stable reference value of the touch screen cannot be obtained. For the case of the present invention, the capacitor node of the touch screen determines the candidate reference value by the capacitance value of the first frame and the capacitance value of the second frame, and determines the stable reference value according to the relationship between the candidate reference value and the original reference value. .

Step S204: According to the capacitance value of the capacitive node of the touch screen in the first frame and the capacitance value of the second frame, Determine an alternate baseline value for the touch screen.

For example, taking the current frame as the 10th frame, the first frame is selected as the 10th frame, and the second frame is the ninth frame. For the capacitive node of the touch screen, the capacitance value of the ninth frame and the 10th frame are respectively obtained. The value of the capacitor. Further, an alternative reference value of the touch screen is determined based on the acquired capacitance value.

For each capacitor node, if it is not touched, the capacitance value of the first frame and the capacitance value of the second frame should be the same; if it is touched, the capacitance value of the first frame and the capacitance value of the second frame It may or may not be the same. If the previous frame is touched and the next frame is released, the capacitance value is different. If both frames are touched, the capacitance values may be the same.

In a feasible manner, when determining the candidate reference value of the touch screen according to the capacitance value of the first frame and the capacitance value of the second frame according to the capacitance node of the touch screen, the capacitance value of the first frame and the second frame may be calculated. The difference between the capacitance values; based on the difference, an alternative reference value for the touch screen is determined. For example, the difference is used to compensate the capacitance value of the second frame to obtain an alternate reference value. By correcting the capacitance value by the difference, the current actual reference value of the touch screen can be gradually approached.

Optionally, when determining an alternative reference value of the touch screen according to the difference, the set update coefficient may be acquired; calculating a product of the update coefficient and the difference; and dividing the product with a capacitance value of the second frame And as an alternative reference value. The update coefficient may be appropriately set by a person skilled in the art according to the actual situation, and is set to any value between 0.02 and 0.1, which is not limited in the embodiment of the present invention. By updating the coefficient, the degree of influence of the difference on the candidate reference value can be set to set the capacitance value of the first frame such as the degree of capacitance of the current frame approaching the actual capacitance reference and the speed.

Step S206: determining whether the candidate reference value of the touch screen matches the original reference value of the pre-stored touch screen, if yes, executing step S208; if not, returning to step S202 after the touch screen is swiped.

In a feasible solution, the candidate reference value and the original reference value may be linearly fitted; according to the result of the linear fitting, it is determined whether the candidate reference value matches the original reference value of the pre-stored touch screen.

Wherein, a linear fit to the alternate baseline value and the original baseline value can be used to linearly fit the original baseline value using the alternate baseline value, or the original baseline value can be used to linearly fit the candidate baseline value.

Based on this, in one aspect, the step of linearly fitting the alternate reference value and the original reference value comprises linearly fitting the alternative reference value using the original reference value in units of the drive channel of the touch screen; in this case And determining, according to the result of the linear fitting, whether the candidate reference value matches the original reference value of the pre-stored touch screen comprises: determining whether the difference between the result of the linear fitting and the candidate reference value is less than a set threshold, and if less, It is then determined that the alternate reference value matches the original reference value; otherwise, it is determined that the alternate reference value does not match the original reference value.

In another aspect, the step of linearly fitting the alternate reference value to the original reference value comprises linearly fitting the original reference value using an alternate reference value in units of drive channels of the touch screen; in this case, The result of the linear fit to determine whether the alternate reference value is the original with the pre-stored touch screen The step of matching the reference value includes: determining whether the difference between the result of the linear fit and the original reference value is less than the set threshold; if less, determining that the candidate reference value matches the original reference value; otherwise, determining the candidate reference The value does not match the original baseline value.

The manner of linear fitting can be implemented by any person skilled in the art according to actual needs, including but not limited to the least squares method. The linear fitting is performed in units of driving channels, and the number of capacitive nodes involved in each driving channel includes a plurality of, so that the result of the linear fitting is more objective, and when driving in the channel, the driving is driven by the presence of LCD noise. The channel is a unit, so LCD noise interference can be avoided in units of drive channels.

In an alternative manner, it may be determined whether the candidate reference value matches the pre-stored original reference value every second set period. The second setting period can be appropriately set by a person skilled in the art according to the actual situation, for example, it is set to perform detection every 50 frames, and the embodiment of the present invention does not limit this. By judging every set period, on the one hand, the effective acquisition of the stable reference value can be ensured, and on the other hand, the data processing burden caused by frequent judgment is avoided.

Step S208: If the candidate reference value of the touch screen matches the pre-stored original reference value, the candidate reference value is determined as a stable reference value of the touch screen.

After the stable reference value of the touch screen is determined, the stable reference value can be used as a criterion for determining the touch detection of the touch screen.

Step S210: Perform touch detection on the touch screen according to the stable reference value.

After the stable reference value of the touch screen is determined, if the touch screen is to be touch-detected, the capacitance value of the frame to be detected may be compared with the stable reference value, and whether the touch is determined according to the comparison result.

Based on the stable reference value of the touch screen, further benchmark update and maintenance operations can be performed based on the stable reference value as follows:

Step S212: receiving an update instruction for the stable reference value of the touch screen, determining a touchless area and a touched area of the touch screen; and updating the stable reference value for the touchless area and the touched area, respectively.

For example, the stable reference value can be updated according to the set update period. When the update cycle arrives, the system or touch controller sends an update command indicating an update to the stable reference value of the touch screen. In this case, the touch screen can be divided into a touchless area and a touched area according to the capacitance value of the current frame of the touch screen, and updated separately. Of course, it may also be a touchless area.

In a feasible manner, the capacitance value of the capacitance node of the touchless area in the third frame and the capacitance value of the fourth frame may be acquired; and the non-touch area is updated according to the capacitance value of the third frame and the capacitance value of the fourth frame. Stabilize the reference value; and/or, keep the stable reference value of the touch area unchanged. In the above manner, the update of the stable reference value for the touchless area and the touched area is performed.

As described above, the "third frame" and the "fourth frame" are only used to distinguish different frames, and do not indicate a sequential relationship, nor do they specifically refer to a certain frame. Normally, the third frame can be the touch screen at the current time. The current frame is engraved, and the fourth frame may be a certain frame before the third frame. The third frame and the fourth frame may be the next two frames, or may be adjacent but spaced two frames.

For updating the stable reference value of the touchless area, refer to the process of determining the candidate reference value in step S204, for example, calculating the difference between the capacitance value of the capacitive node of the touch screen and the capacitance value of the fourth frame. Calculating a product of the set update coefficient and the difference value; updating the stable reference value of the touchless area using a sum of the product and the capacitance value of the fourth frame.

For a touched area, the stable reference value of the capacitive node in the touched area can be kept unchanged.

That is, after the stable reference value is determined, the stable reference value is periodically updated for the non-touch area, and the stable reference value is maintained for the touched area.

In addition, in the touched area, there may be a capacitive node that is touched for a long time. In this case, it is necessary to determine whether there is a capacitive node whose touch duration is longer than the set time in the touched area; if it exists, the determination is performed. Whether the capacitance value of the capacitor node in the current frame matches the corresponding original reference value; if it matches, the corresponding original reference value is updated by using the capacitance value in the current frame. The setting time can be appropriately set by a person skilled in the art according to the actual situation, which is not limited by the embodiment of the present invention. In this way, it is possible to avoid the occurrence of a missed point or a point of elimination caused by the original reference value error.

In addition, the original reference value may be updated and maintained when the touch screen enters the low power mode. For example, when determining that the touch screen enters the low power mode, the capacitance value of the capacitive node of the touch screen in the current frame may be determined. Corresponding original reference values are matched; if they do not match, the corresponding original reference values are corrected according to the capacitance values in the current frame. The manner of correcting the corresponding original reference value according to the capacitance value in the current frame includes but is not limited to: calculating a difference between the capacitance value in the current frame and the corresponding original reference value, and setting the difference according to the setting Scale the compensation to the original reference value. The setting ratio can be appropriately set by a person skilled in the art according to the actual situation, for example, it is set to one eighth, and the like, which is not limited by the embodiment of the present invention.

Through the embodiment, the determination, update and maintenance of the stable reference value of the touch screen are realized, which not only enables the determined touch screen stable reference value to effectively approach the current actual capacitance reference of the touch screen, so that the determined stable reference value is more accurate and determined. After the reference value is stabilized, it can be ensured that the stable reference value of the touchless area can continuously follow the change of the environment, and the determination of the capacitance difference does not affect the normal touched area. Using this stable reference value for touch detection, accurate touch detection results can be obtained.

Embodiment 3

Referring to FIG. 3, a flow chart of steps of a touch detection method according to a third embodiment of the present invention is shown.

This embodiment takes a specific example as an example to describe the touch detection scheme provided by the present invention. The touch detection method of this embodiment includes the following steps:

Step S302: The touch screen is powered on.

Step S304: Acquire a capacitance value of the current node of the capacitive node of the touch screen after power-on.

In this embodiment, the current frame is a frame of the touch screen at the current time, and the current frame changes as the process is executed. In this step, the capacitance value of the acquired capacitor node in the current frame is set to the capacitance value of the ninth frame.

After the touch screen is powered on, since the circuit of the first frame is not completely stable, the capacitance value of the capacitor node in the ninth frame is set, and the capacitance value of the subsequent frame can be made worse by the capacitance value of the ninth frame. Get information such as finger touch. However, it should be understood by those skilled in the art that the ninth frame is merely an exemplary description. In practical applications, those skilled in the art may use other frames according to actual needs.

Step S306: Read the original reference value stored in the nonvolatile memory.

Step S308: It is determined whether the capacitance value of the current frame matches the original reference value. If not, step S310 is performed; if it is matched, the capacitance value of the current frame is determined as the stable reference value of the touch screen, and then step S314 is performed.

As described above, in this embodiment, the current frame is the ninth frame, but if the capacitance value of the current frame does not match the original reference value, the current frame changes as the flow progresses.

In this step, the original reference value (backup reference) stored in the non-volatile memory is read, and the capacitance value of the ninth frame is linearly fitted (for example, the least squares method) by using the original reference value in units of driving channels. The result is different from the capacitance value of the ninth frame, and the fitting error is obtained. According to the fitting error, the matching degree between the capacitance value of the ninth frame and the original reference value is determined, and if the fitting error is greater than the threshold (the touch screen thresholds of different touch screens are different) ), the capacitance value of the ninth frame is the capacitance value containing the touch information, such as with the hand open screen; if the error is less than the threshold, the capacitance value of the ninth frame matches the original reference value, and there is no touch information.

In this example, the process of calling the touch screen from power-on to obtaining a stable reference value without touch is a process of obtaining a stable reference value. The process depends on whether there is a hand or other foreign matter touching the screen after power-on. If no foreign matter comes into contact with the power, the process of obtaining the stable reference value is ended immediately; if the foreign matter comes into contact with the power, the foreign matter leaves the end to obtain a stable reference value. process.

When there is a foreign matter contact power-on, the capacitance value of the ninth frame does not match the original reference value, and the process of obtaining the stable reference value needs to be continued.

Step S310: After the touch screen is swiped and the capacitance value of the capacitor node is updated, the capacitance value of the frame of the capacitive node of the touch screen after the screen is swept and the capacitance value of the previous frame are obtained, according to the capacitance value of the frame after the screen and the previous The capacitance value of one frame determines the alternative reference value.

In this step, the frame after the screen is recorded as the 10th frame, and the candidate reference value is determined according to the capacitance values of the capacitance node in the ninth frame and the tenth frame.

When there is a foreign object contact power-on, in the process of obtaining a stable reference value, the following process needs to be performed:

Record the original capacitance value of the ith capacitor node as Ref _old (i) (ie, the capacitance value of the ith capacitor node in the second frame, such as the capacitance value of the ninth frame), and the current capacitance value is RawData(i) ( That is, the capacitance value of the ith capacitor node in the first frame, such as the capacitance value of the 10th frame, determines the alternative reference value as Ref _new (i). Then, the alternative baseline value satisfies the following formula:

Ref _new (i)=Ref _old (i)+α×(RawData(i)-Ref _old (i))

Where α is the update coefficient, the value range is [0.02, 0.1], usually 0.02. The process shown in the above formula is executed every N frames (such as every 5 frames). By performing this process, it is ensured that the capacitor reference gradually approaches the current actual reference of the touch screen while satisfying the basic line drawing. In the process of obtaining a stable reference value, the degree of matching between the capacitance value of the current frame and the original reference value of the capacitor node can be periodically detected (for example, every 50 frames). If the two match, the process of obtaining the stable capacitance reference can be ended.

Step S312: determining whether the candidate reference value matches the original reference value, if not, returning to step S310; if matching, determining the candidate reference value as the stable reference value of the touch screen, and then performing step S314.

Step S314: Determine the touched area and the non-touch area of the touch screen, and perform corresponding stable reference value update for the touched area and the non-touch area, respectively.

After the process of obtaining the stable reference value is completed, the subsequent stable reference value update and maintenance may be performed in the following manner: according to the difference between the capacitance value of the current frame and the stable reference value, the full-screen capacitor node may be divided into Touch area and no touch area. For the no-touch area, the stable reference value update is performed in the manner described in step S308, and the stable reference value is approximated to the current frame capacitance value (RawData) by a certain coefficient every fixed period; for the touched area, the stable reference value is stabilized. constant. As mentioned before, the current frame is the frame of the touch screen at the current time, and the current frame changes as the execution of the process.

Step S316: determining whether there is a capacitive node whose touch duration exceeds the set time, and the capacitance value in the current frame matches the original reference value, if present, updating the original reference value corresponding to the capacitance node; if not Then, step S318 is performed.

In order to prevent the false offset point or the elimination point caused by the original reference value error, the present example also provides an error correction mechanism, that is, matching the capacitance value in the current frame with the original reference value for the touch position having a long time. Detection, if the two are matched, the original reference value is corrected using the capacitance value of the current frame. For the detection of whether the two are matched, refer to the manner in the foregoing step S308, and details are not described herein again.

Through this step, when a large capacitance difference occurs continuously for a long time in the same capacitor node, the capacitor node is judged. If the capacitance value in the current frame matches the original reference value, it indicates that the capacitor is false. The corresponding original reference value is updated.

As mentioned before, the current frame is the frame of the touch screen at the current time, and the current frame changes as the execution of the process.

Step S318: determining whether to enter the low power consumption mode, and if yes, updating the original reference value; If no, the process ends.

The touch screen has no touch information for a period of time to enter a low power mode to reduce power consumption. The original reference value stored in the nonvolatile memory needs to be corrected before entering the low power mode for the first time after power-on. If the original reference value does not match the capacitance value in the current frame that is about to enter low power consumption, the original reference value is corrected, such as proportionally offsetting the partial deviation into the original reference value, after a long-term correction process, the original reference The value will gradually approach the actual actual capacitance value of the actual touch screen.

Through this step, the original reference value and the screen feature mismatch caused by factors such as the aging of the screen of the touch screen can be effectively avoided, and the validity of the original reference value is maintained.

It should be noted that, in this embodiment, step S318 is performed after step S316 is performed as an example, but it should be understood by those skilled in the art that in actual application, step S318 may also be performed before step S316, or may be performed in parallel. You can also choose one.

In this embodiment, the original reference value of the touch screen when the touch is not taken is stored and backed up. When the environmental difference causes the original reference value to be directly used as a correct reference for calculation, the capacitance value of the current frame of the touch screen can be determined by linear fitting. Correlation with the original reference value to know whether the current touch screen has touch information. Furthermore, for the case of touch information, an effective stable reference value determination scheme is provided, and the stable reference value of the non-differentiated area and the full-screen capacitor node is determined and continuously updated in units of capacitor nodes, thereby avoiding the sudden update of the entire touch screen. The dramatic changes brought about; on the other hand, the use of constantly updated strategies can gradually and steadily approach the baseline differences caused by environmental changes.

After the stable reference value is determined, the stability reference value is maintained in units of capacitor nodes, and the capacitor node is divided into a touched area and a non-touch area, and the stable reference value is updated proportionally for a certain period of the non-touch area. The stable reference value is not updated for touched areas. Therefore, it can be ensured that the stable reference value of the non-touch area continuously follows the change of the environment, and the touched area does not affect the normal capacitance difference, and the non-touch reference is not obtained when the power is turned on, and the phenomenon that the point is not lost does not occur. .

Embodiment 4

Referring to FIG. 4, a block diagram of a structure of a touch detecting apparatus according to a fourth embodiment of the present invention is shown.

The touch detection device of the present embodiment includes: an acquisition module 402, configured to acquire a capacitance value of a capacitance node of the touch screen in a first frame and a capacitance value of a second frame; and a first determining module 404, configured to use a capacitance value according to the first frame And the capacitance value of the second frame determines an alternative reference value of the touch screen; the determining module 406 is configured to determine whether the candidate reference value matches the original reference value of the pre-stored touch screen; and the second determining module 408 is configured to: if the candidate reference value Matching with the pre-stored original reference value, the candidate reference value is determined as a stable reference value of the touch screen, wherein the stable reference value is a judgment basis of the touch detection.

The touch detection device of the embodiment is used to implement a corresponding touch in the foregoing multiple method embodiments. The detection method has the beneficial effects of the corresponding method embodiments, and details are not described herein again.

Embodiment 5

Referring to FIG. 5, a block diagram of a structure of a touch detecting apparatus according to a fifth embodiment of the present invention is shown.

The touch detection device of this embodiment includes: an acquisition module 502, configured to acquire a capacitance value of a capacitance node of the touch screen in a first frame and a capacitance value of a second frame; and a first determining module 504, configured to use a capacitance value according to the first frame And a capacitance value of the second frame determines an alternate reference value of the touch screen; the determining module 506 is configured to determine whether the candidate reference value matches the original reference value of the pre-stored touch screen; and the second determining module 508 is configured to: if the candidate reference value Matching with the pre-stored original reference value, the candidate reference value is determined as a stable reference value of the touch screen, wherein the stable reference value is a judgment basis of the touch detection.

Optionally, the obtaining module 502 is configured to obtain a capacitance value of the capacitor node in the first frame and a capacitance value of the second frame after the touch screen is powered on.

Optionally, the capacitance value of the first frame is a capacitance value of the Nth frame from the power-on time, and N is greater than 2.

Optionally, the first determining module 504 is configured to calculate a difference between the capacitance value of the first frame and the capacitance value of the second frame, and determine the candidate reference value according to the difference.

Optionally, the first determining module 504 is configured to calculate a difference between a capacitance value of the first frame and a capacitance value of the second frame, obtain a set update coefficient, and calculate a product of the update coefficient and the difference value. The sum of the product and the capacitance value of the second frame is used as an alternative reference value.

Optionally, the determining module 506 includes: a linear fitting sub-module 5062, configured to linearly fit the candidate reference value and the original reference value; and the fitting result determining sub-module 5064 is configured to determine according to the result of the linear fitting Whether the alternate reference value matches the original reference value of the pre-stored touch screen.

Optionally, the linear fitting sub-module 5062 is configured to linearly fit the candidate reference value using the original reference value in units of driving channels of the touch screen; the fitting result determining sub-module 5064 is used to determine the result and the alternative of the linear fitting. Whether the difference of the reference values is less than a set threshold, if not, determining that the candidate reference value matches the original reference value; otherwise, determining that the candidate reference value does not match the original reference value.

Alternatively, optionally, the linear fitting sub-module 5062 is configured to linearly fit the original reference value using the candidate reference value in units of driving channels of the touch screen; the fitting result determining sub-module 5064 is used to determine the result of the linear fitting and Whether the difference of the original reference value is less than the set threshold; if less, determining that the candidate reference value matches the original reference value; otherwise, determining that the alternate reference value does not match the original reference value.

Optionally, the touch detection device of the embodiment further includes: an area distinguishing module 510, configured to receive an update instruction for a stable reference value of the touch screen, determine a touchless area and a touched area of the touch screen; and an update module 512, configured to: An update of the stable reference value is performed on the touchless area and the touched area, respectively.

Optionally, the update module 512 includes: a touchless area update submodule 5122, configured to acquire a capacitance value of the capacitive node of the touchless area in the third frame and a capacitance value of the fourth frame; according to the capacitance value of the third frame and the a capacitance value of four frames, updating a stable reference value of the touch area; and/or having a touch area The update sub-module 5124 is configured to keep the stable reference value of the touched area unchanged.

Optionally, the touchless area update submodule 5122 is configured to acquire a capacitance value of the capacitive node of the touchless area in the third frame and a capacitance value of the fourth frame; calculate a capacitance value of the third frame and a capacitance value of the fourth frame. The difference between the calculated update coefficients and the difference; the stable reference value of the touchless area is updated using the sum of the product and the capacitance value of the fourth frame.

Optionally, the touch detection device of the embodiment further includes: a first original reference value update module 514, configured to determine, in the touched area, whether there is a capacitive node whose touch duration is greater than a set time; if yes, Then, it is determined whether the capacitance value of the capacitor node in the current frame matches the corresponding original reference value; if it matches, the corresponding original reference value is updated by using the capacitance value in the current frame.

Optionally, the touch detection device of the embodiment further includes: a second original reference value update module 516, configured to determine that the touch screen enters a low power consumption mode, determine a capacitance value of the capacitive node of the touch screen in the current frame, and a corresponding original reference. Whether the values match; if they do not match, the corresponding original reference values are corrected according to the capacitance values in the current frame.

Optionally, the second original reference value update module 516 is configured to determine that the touch screen enters a low power consumption mode, and determine whether a capacitance value of the touched capacitive node in the current frame matches a corresponding original reference value; if not, Calculating a difference between the capacitance value in the current frame and the corresponding original reference value; compensating the difference to the original reference value according to a set ratio.

Optionally, the touch detection device of this embodiment further includes: a detection module 518, configured to perform touch detection on the touch screen according to the stable reference value.

The touch detection device of the present embodiment is used to implement the corresponding touch detection method in the foregoing multiple method embodiments, and has the beneficial effects of the corresponding method embodiments, and details are not described herein again.

Embodiment 6

Referring to FIG. 6, a schematic structural diagram of a touch screen according to Embodiment 6 of the present invention is shown.

The touch screen of the present embodiment includes a touch controller 602 and a touch sensor 604, and the touch controller 602 and the touch sensor 604 are electrically connected.

The touch sensor 604 includes a plurality of driving electrodes 6042 and a plurality of sensing electrodes 6044 vertically distributed with the driving electrodes 6042. The driving electrode 6042 is disposed in a lateral direction, and the sensing electrode 6044 is disposed in a longitudinal direction, wherein a node at which the driving electrode 6042 and the sensing electrode 6044 meet forms a capacitance node.

The touch controller 602 inputs the driving signal of the preset frequency to the driving electrode 6042 according to a certain driving manner. After the driving signal passes through the capacitive sensor, the sensing signal is formed by the sensing electrode 6044 and returned to the touch controller 602. The touch controller 602 converts the sensing signal into a digital signal through an analog-to-digital converter (ADC) disposed inside thereof, and parses the digital signal to obtain a capacitance value corresponding to each capacitance node.

In this embodiment, the touch sensor 604 collects the capacitance value of the capacitor node on the touch screen; The controller 602 acquires the capacitance value collected by the touch sensor 604, and performs an operation corresponding to the touch detection method according to any one of the first to third embodiments according to the acquired capacitance value.

For example, the touch sensor 604 collects the capacitance value of the capacitive node of the touch screen at the first frame and the capacitance value of the second frame; the touch controller 602 acquires the capacitance value of the capacitive node of the touch screen in the first frame and the second frame from the touch sensor 604. The capacitance value in the touch controller 602 determines an alternate reference value of the touch screen according to the capacitance value of the first frame and the capacitance value of the second frame; and then determines whether the candidate reference value matches the original reference value of the pre-stored touch screen; The touch controller 602 determines that the alternate reference value matches the pre-stored original reference value, and then determines the alternate reference value as a stable reference value of the touch screen to perform touch detection using the stable reference value.

In addition, an embodiment of the present invention further provides an electronic terminal including the touch screen described in the foregoing embodiment.

The device embodiments described above are merely illustrative, wherein the modules described as separate components may or may not be physically separate, and the components displayed as modules may or may not be physical modules, ie may be located A place, or it can be distributed to multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. Those of ordinary skill in the art can understand and implement without deliberate labor.

Through various embodiments of the present invention, a touch detection scheme is provided, by which a determination and update mechanism of a stable reference value of a touch screen can be realized by using an original reference value and an alternative reference stored in a nonvolatile memory. The correlation of the values is compared to obtain the degree of matching between the two, and the stable reference value is determined according to the degree of matching. When the touch screen contains touch information, the actual capacitance reference is finally approached by updating the stable reference value of the capacitor node. After determining the stable reference value, the maintenance stable stable reference value is updated by different stable reference value update mechanisms for different touch states of the touch screen. The update and maintenance of the stable reference value is in units of capacitor nodes, and each capacitor node is relatively independent, and does not affect the error update of other capacitor nodes due to the abnormality of one capacitor node.

Through the description of the above embodiments, those skilled in the art can clearly understand that the various embodiments can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware. Based on such understanding, portions of the above technical solutions that contribute substantially or to the prior art may be embodied in the form of a software product that may be stored in a computer readable storage medium, the computer readable record The medium includes any mechanism for storing or transmitting information in a form readable by a computer (eg, a computer). For example, a machine-readable medium includes read only memory (ROM), random access memory (RAM), magnetic disk storage media, optical storage media, flash storage media, electrical, optical, acoustic, or other forms of propagation signals (eg, carrier waves) , infrared signal, digital signal, etc.), the computer software product includes a number of instructions for making a computer device ( The method described in various parts of the various embodiments or embodiments is performed by a personal computer, server, or network device.

It should be noted that the above embodiments are only used to explain the technical solutions of the embodiments of the present invention, and are not limited thereto; although the embodiments of the present invention are described in detail with reference to the foregoing embodiments, those skilled in the art should understand The technical solutions described in the foregoing embodiments may be modified, or some of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. Spirit and scope.

Claims

A touch detection method includes:

Obtaining a capacitance value of the capacitive node of the touch screen in the first frame and a capacitance value of the second frame;

Determining an alternate reference value of the touch screen according to the capacitance value of the first frame and the capacitance value of the second frame;

Determining whether the candidate reference value matches a pre-stored original reference value of the touch screen;

If the candidate reference value matches the pre-stored original reference value, the alternative reference value is determined as a stable reference value of the touch screen, wherein the stable reference value is a determination basis of touch detection.
The method of claim 1, wherein the capacitance value of the first frame and the capacitance value of the second frame are acquired after the touch screen is powered up.
The method of claim 2, wherein the capacitance of the first frame is a capacitance value of the Nth frame from the power-on time, and N is greater than 2.
The method of claim 1, wherein the determining the alternate reference value of the touch screen based on the capacitance value of the first frame and the capacitance value of the second frame comprises:

Calculating a difference between the capacitance value of the first frame and the capacitance value of the second frame, and determining the candidate reference value according to the difference.
The method of claim 4, wherein determining the candidate reference value based on the difference comprises:

Get the set update factor;

Calculating a product of the update coefficient and the difference;

The sum of the product and the capacitance value of the second frame is taken as the candidate reference value.
The method of any of claims 1-5, wherein the step of determining whether the candidate reference value matches the pre-stored original reference value of the touch screen comprises:

Linearly fitting the candidate reference value and the original reference value;

Based on the result of the linear fit, it is determined whether the candidate reference value matches the pre-stored original reference value of the touch screen.
The method of claim 6 wherein

The step of linearly fitting the candidate reference value and the original reference value comprises linearly fitting the candidate reference value using the original reference value in units of driving channels of the touch screen;

Determining, according to the result of the linear fitting, whether the candidate reference value matches the pre-stored original reference value of the touch screen comprises: determining whether a difference between the result of the linear fit and the candidate reference value is less than Setting a threshold, if less, determining that the alternate reference value matches the original reference value; otherwise, determining that the alternate reference value does not match the original reference value.
The method of claim 6 wherein

The step of linearly fitting the candidate reference value and the original reference value comprises linearly fitting the original reference value using the candidate reference value in units of driving channels of the touch screen;

Determining, according to a result of the linear fitting, whether the candidate reference value matches the pre-stored original reference value of the touch screen comprises: determining whether a difference between the result of the linear fit and the original reference value is less than Determining a threshold; if less, determining that the candidate reference value matches the original reference value; otherwise, determining that the candidate reference value does not match the original reference value.
The method of any of claims 1-8, wherein the method further comprises:

Receiving an update instruction for a stable reference value of the touch screen, determining a touchless area and a touched area of the touch screen;

An update of the stable reference value is performed on the touchless area and the touched area, respectively.
The method of claim 9, wherein the step of respectively updating the non-touch area and the touched area with a stable reference value comprises at least one of the following two steps:

Obtaining a capacitance value of the capacitance node of the touchless area in a third frame and a capacitance value of the fourth frame; updating a stable reference of the touchless area according to the capacitance value of the third frame and the capacitance value of the fourth frame value;

The stable reference value of the touched area is maintained unchanged.
The method of claim 10, wherein the step of updating the stable reference value of the touchless area according to the capacitance value of the third frame and the capacitance value of the fourth frame comprises:

Calculating a difference between a capacitance value of the third frame and a capacitance value of the fourth frame;

Calculating a product of the set update coefficient and the difference;

The stable reference value of the touchless area is updated using the sum of the product and the capacitance value of the fourth frame.
The method of claim 10 or 11, wherein the method further comprises:

Determining, in the touched area, whether there is a capacitance whose touch duration is longer than a set time node;

If yes, determining whether the capacitance value of the capacitor node in the current frame matches the corresponding original reference value;

If it matches, the corresponding original reference value is updated using the capacitance value in the current frame.
The method of any of claims 1 to 12, wherein the method further comprises:

Determining that the touch screen enters a low power consumption mode, and determining whether a capacitance value of the capacitive node of the touch screen matches a corresponding original reference value in the current frame;

If there is no match, the corresponding original reference value is corrected according to the capacitance value in the current frame.
The method of claim 13 wherein the step of correcting the corresponding original reference value based on the capacitance value in the current frame comprises:

Calculating a difference between a capacitance value in the current frame and a corresponding original reference value;

The difference is compensated to the original reference value in a set ratio.
The method of any of claims 1 to 14, wherein the method further comprises:

Touch detection is performed on the touch screen according to the stable reference value.
A touch detection device includes:

An obtaining module, configured to acquire a capacitance value of the capacitive node of the touch screen in a first frame and a capacitance value of the second frame;

a first determining module, configured to determine an alternate reference value of the touch screen according to the capacitance value of the first frame and the capacitance value of the second frame;

a determining module, configured to determine whether the candidate reference value matches a pre-stored original reference value of the touch screen;

a second determining module, configured to determine the candidate reference value as a stable reference value of the touch screen if the candidate reference value matches a pre-stored original reference value, wherein the stable reference value is touch detected Judging the benchmark.
The device of claim 16, wherein the obtaining module is configured to acquire a capacitance value of the capacitance node in the first frame and a capacitance value of the second frame after the touch screen is powered on.
The apparatus according to claim 17, wherein the capacitance value of said first frame is a capacitance value of an Nth frame from a power-on time, and N is greater than 2.
The apparatus of claim 16 wherein said first determining module is operative to calculate said The difference between the capacitance value of the first frame and the capacitance value of the second frame determines the candidate reference value based on the difference.
The apparatus of claim 19, wherein the first determining module is configured to calculate a difference between a capacitance value of the first frame and a capacitance value of the second frame, obtain a set update coefficient, and calculate a product of the update coefficient and the difference; a sum of the product and a capacitance value of the second frame as the candidate reference value.
The apparatus of any one of claims 16 to 20, wherein the determining module comprises: a linear fitting sub-module for linearly fitting the candidate reference value and the original reference value; fitting The result judging submodule is configured to judge whether the candidate reference value matches the pre-stored original reference value of the touch screen according to the result of the linear fitting.
The device according to claim 21, wherein

The linear fitting sub-module is configured to linearly fit the candidate reference value using the original reference value in units of driving channels of the touch screen;

The fitting result determining submodule is configured to determine whether a difference between the result of the linear fitting and the candidate reference value is less than a set threshold, and if less, determine the candidate reference value and the original reference value Matching; otherwise, it is determined that the alternate reference value does not match the original reference value.
The device according to claim 21, wherein

The linear fitting sub-module is configured to linearly fit the original reference value by using the candidate reference value in units of driving channels of the touch screen;

The fitting result determining submodule is configured to determine whether a difference between the result of the linear fitting and the original reference value is less than the set threshold; if less, determining the candidate reference value and the original reference The value matches; otherwise, it is determined that the alternate reference value does not match the original reference value.
The device of any of claims 16 to 23, wherein the device further comprises:

An area distinguishing module, configured to receive an update instruction for a stable reference value of the touch screen, and determine a touchless area and a touched area of the touch screen;

And an update module, configured to perform an update of the stable reference value on the touchless area and the touched area, respectively.
The apparatus of claim 24, wherein the update module comprises at least one of the following two sub-modules:

a touchless area update submodule, configured to acquire the capacitive node of the touchless area in the third frame The capacitance value and the capacitance value of the fourth frame; updating the stable reference value of the touchless area according to the capacitance value of the third frame and the capacitance value of the fourth frame;

There is a touch area update sub-module for maintaining the stable reference value of the touched area unchanged.
The device of claim 25, wherein the touchless area update submodule is configured to acquire a capacitance value of the capacitive node of the touchless area at a third frame and a capacitance value of a fourth frame; calculate the third frame And a difference between the capacitance value of the fourth frame and the capacitance value of the fourth frame; calculating a product of the set update coefficient and the difference; updating the none using a sum of the product and the capacitance value of the fourth frame The stable reference value of the touch area.
The device of claim 25 or 26, wherein the device further comprises:

a first original reference value update module, configured to determine, in the touched area, whether there is a capacitive node whose touch duration is greater than a set time; if yes, determine a capacitance value of the capacitive node in the current frame and corresponding Whether the original reference values match; if they match, the corresponding original reference values are updated using the capacitance values in the current frame.
The device of any of claims 16-27, wherein the device further comprises:

a second original reference value updating module, configured to determine that the touch screen enters a low power consumption mode, and determine whether a capacitance value of the capacitive node of the touch screen matches a corresponding original reference value in a current frame; if not, according to The capacitance value in the current frame is corrected for the corresponding original reference value.
The device according to claim 28, wherein

a second original reference value updating module, configured to determine that the touch screen enters a low power consumption mode, and determine whether a capacitance value of the capacitive node of the touch screen matches a corresponding original reference value in a current frame; if not, the calculation is performed The difference between the capacitance value in the current frame and the corresponding original reference value; the difference is compensated to the original reference value according to a set ratio.
The device of any of claims 16-29, wherein the device further comprises:

And a detecting module, configured to perform touch detection on the touch screen according to the stable reference value.
A touch screen includes: a touch controller and a touch sensor, the touch controller and the touch sensor being electrically connected;

among them,

The touch sensor is configured to collect a capacitance value of a capacitor node on the touch screen;

The touch controller is configured to acquire a capacitance value collected by the touch sensor, and obtain the The capacitance value taken performs the operation corresponding to the touch detection method according to any one of claims 1-15.
An electronic terminal comprising the touch screen of claim 31.
A computer storage medium storing executable instructions for acquiring a capacitance value of a capacitive node of a touch screen at a first frame and a capacitance value of a second frame; for using the first frame according to the first frame An executable instruction that determines an alternate reference value of the touch screen and a executable instruction for determining whether the alternate reference value matches a pre-stored original reference value of the touch screen; An executable instruction for determining the candidate reference value as a stable reference value of the touch screen if the candidate reference value matches a pre-stored original reference value, wherein the stable reference value is a determination of touch detection Benchmark.