CN1323343C - Click Action Recognition Method and Its Controller - Google Patents

Abstract

The invention provides a single-click action identification method, which is characterized in that the action of an object contacting a touch pad is detected to occur and timing is started, then the action of the object contacting the touch pad is detected to be finished, so as to obtain a first time interval of the object contacting the touch pad, timing is finished after a second time interval of the timing is started, if the second time interval is larger than the first time interval and the first time interval is larger than a preset time interval, and when a single-click action occurs in which only one-time contact time in the second time interval is larger than the preset time interval and a contact position coordinate is located in a legal area of the single-click action, a control signal representing the single-click action is generated.

Description

Click Action Recognition Method and Its Controller

technical field

The invention relates to a single-click recognition method of a touch panel, in particular to a recognition method capable of effectively suppressing noise and improving recognition rate, and a controller using the method.

Background technique

Touch pad is a kind of user-friendly input device, because the previous input devices such as keyboard, mouse and track ball cannot fully meet the needs of users, and because today's electronic products are designed with light, thin and short , small orientation, since it is impossible to integrate all types of input devices, and the touchpad can not only meet the requirements of multi-level menu design, but also have humanized operation methods such as keyboard, mouse and handwriting input, so has become the most popular choice.

Referring to FIG. 1 , after the touch panel 10 generates an analog voltage signal, a controller 20 performs analog/digital conversion and calculates the coordinate value of the touch point, and at the same time identifies whether the user generates a single click ( tap, or click), double tap (double tap, or double click), drag (drag), and movement (movement), after actions such as, will send relevant control signals to a host computer 30, so that further control the screen of host computer 30 The cursor on the 40 performs actions such as moving, clicking objects, and executing programs.

In the controller 20, its analog/digital converter (not shown) is susceptible to external noise (noise), such as interference from electromagnetic waves. In addition to careful layout of the internal circuits of the controller 20 and adding various filters to solve this problem In addition to the problem, it is necessary to add appropriate sampling and identification algorithms, otherwise the noise will easily cause short-term false pressing or false leaving, and cause the controller 20 to misjudge the action.

US Patent No. 6,380,931 discloses a "click" action recognition method for a touch panel, the content of which is summarized below as an illustration. As shown in Figure 2, it first detects whether there is an object (such as a stylus) touching the touch panel (as in step 201), and then compares whether the time T when the object touches the touch panel is less than a predetermined value Tmax ( Such as step 202), and then determine whether the moving range (displacement) S of the object on the touch panel is less than a predetermined value Smax (step 203), and only after meeting the above two limiting conditions can it be judged that this is a "single "Click" action, and then send a "click" control signal and the coordinate information of the touch position to the host. However, this method cannot effectively suppress the noise that is likely to cause false pressing, especially for the calculation of the two limiting conditions (contact time and moving range), and the construction cost of the logic circuit is relatively high.

Contents of the invention

The object of the present invention is to provide a click action recognition method and its controller which can effectively filter unnecessary noise to increase the accuracy of the “click” action recognition.

Therefore, the controller of the present invention is used to identify the action of at least one object on the touch panel, so as to send a control signal corresponding to the action to a host. The controller includes a coordinate calculation unit, a contact detection unit, a timing unit, a computing unit, and a coding unit.

The coordinate calculation unit is used to detect the electronic signal sent by the touch panel to calculate the coordinate position of the object touching the touch panel. The contact detection unit is used to detect the electronic signal sent by the touch panel to determine whether the object is in contact with the touch panel.

The computing unit can calculate the first time distance between the object and the touch panel when the object ends the contact action according to the judgment result of the contact detection unit, and the computing unit judges that the first time distance is shorter than the first time distance Two time intervals and the first time interval is greater than a predetermined time interval, and there is only one touch within the second time interval that has a contact time greater than the predetermined time interval and its contact position coordinates fall within the legal area of a single-click action When an action occurs, the arithmetic unit generates a control signal representing the click action.

The encoding unit is used to encode the control signal generated by the computing unit and the coordinate position generated by the coordinate computing unit, and transmit them to the host computer.

The identification method of the click action of the present invention firstly detects that the object touches the touch panel and starts timing, and then detects that the object touches the touch panel ends, so as to obtain the contact between the object and the touch panel. the first time interval. Finally, when the first time interval is less than a second time interval and greater than a predetermined time interval, there is only one contact time within the second time interval that is greater than the predetermined time interval and its contact position coordinates fall within a click action. When a tap action occurs within the legal area, a control signal indicating a click action is generated.

To put it simply, in addition to judging whether there is only one touch action within the second time interval, the present invention further adds the condition of whether the time interval when the object is in contact with the touch panel is greater than the predetermined time interval and shorter than the second time interval Therefore, noise can be effectively suppressed, and the accuracy of action recognition can be increased. What's more, since the moving range is not used as a limiting condition in the past, it can reduce the construction cost of logic circuits and reduce power consumption, etc.

In order to further illustrate the above-mentioned purpose, structural features and effects of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is a schematic diagram illustrating the relationship between a touch panel, a controller and a host;

FIG. 2 is a flow chart illustrating the steps of the click action recognition method disclosed in US Patent No. 6,380,931;

Fig. 3 is a schematic diagram illustrating a preferred embodiment of the controller of the touch panel of the present invention;

FIG. 4 is a flow chart illustrating the steps of the method for identifying a click action of the present invention; and

FIG. 5 is a timing diagram illustrating that the present invention generates corresponding control signals according to a correct click action.

Detailed ways

Referring to FIG. 3 , the controller 100 of the touch panel 300 of the present invention is used to recognize an action of an object 200 on the touch panel 300 to send a control signal corresponding to the action to a host 400 . It should be noted that the touch panel 300 can generally refer to capacitive, inductive and other similar touch panels 300 , and in this example, it particularly refers to a capacitive touch panel 300 .

The object 200 is used to contact the touch panel 300, that is, according to the action of the object 200 on the touch panel 300, the controller 100 will send a corresponding control signal representing its action to the host 400. Generally, these control signals It can be divided into coordinate change, click, double-click, drag, move, scroll, left button, right button, middle button, etc., to further simulate the behavior of the mouse and keyboard. Certainly, the object 200 needs to cooperate with the touch panel 300 , such as a capacitive touch panel 300 , and the object 200 is a human finger or other types of conductors.

The host 400 refers to various electronic devices, such as desktop computers, notebook computers, tablet computers, personal digital assistants (PDAs), mobile phones, remote controls for various electrical appliances, or other devices that can be used with the touch panel 300 as an input device. of electronic devices.

A preferred embodiment of the controller 100 includes an analog/digital conversion unit 1, a coordinate calculation unit 2, a contact detection unit 3, a computing unit 4, an encoding unit 5, a transmission interface unit 6, and a timing unit 7.

Since the touch panel 300 has a plurality of wires distributed in the X and Y directions respectively, when the object 200 touches the touch panel 300, the capacitance value of the touch panel 300 will change, so the voltage can be measured The amount of change to calculate values such as coordinate values.

The analog/digital conversion unit 1 is connected to the touch panel 300 and can convert different voltages into corresponding digital signals for subsequent processing. After the coordinate calculation unit 2 receives the digital signal transmitted from the analog/digital conversion unit 1, it decodes the digital signal into a corresponding absolute coordinate value (X, Y).

The contact detection unit 3 can detect whether the touch panel 300 is pressed by an object at present, that is, according to the X, Y voltage signals transmitted by the touch panel 300, the length of time for the object 200 to be applied to the touch panel 300 can be calculated. The parameter of the length of time involves the judgment of actions such as clicking, double-clicking, and dragging.

The calculation unit 4 is connected with the coordinate calculation unit 2 and the contact detection unit 3. The calculation unit 4 can mainly be based on the result judged by the contact detection unit 3, and then supplemented by the built-in logic algorithm of the calculation unit 4. It is determined whether the action performed by the user meets the conditions of single click, double click, drag, etc. Since the present invention focuses on the determination of the single click action, this part will be described in detail below.

In addition to the judgment of the action, the calculation unit 4 can also provide the relative movement amount, that is, when multiple sets of absolute coordinate values are sent to the calculation unit 4 in sequence, the calculation unit 4 can also calculate the difference between the front and rear coordinates of the object. The relative movement of the 200 on the touch panel 300 , even parameters such as speed, direction, and distance, as to whether to transmit the absolute coordinates or the relative movement to the host 400 depends on the application requirements of the host 400 .

The encoding unit 5 is connected with the computing unit 4, so it can receive the absolute coordinate signal, the relative movement signal, or the touch signal (including click, double click, drag, etc.) generated by the computing unit 4 . The encoding unit 5 encodes different signals into handwriting input protocols or standard mouse protocols for the operating system of the host 400 to process, such as Microsoft's mouse standard protocol and IBM's PS/2 mouse standard protocol.

The function of the transmission interface unit 6 is to transmit the encoded signal of the encoding unit 5 to the host computer 400 in a serial manner. Taking the desktop computer as an example, it is transmitted to the keyboard controller (not shown) or the south bridge chip (not shown), in order to send an interrupt request (IRQ) to the processor in the host 400, so that the host 400 can further obtain necessary parameters such as coordinate position and execution action, to further move the cursor and program An action such as selection or execution of a program.

Referring to Fig. 4 and Fig. 5, the identification method of the click action of the present invention is firstly shown in steps 401 and 402, using the contact detection unit 3 to detect the occurrence of the action that the object 200 touches the touch panel 300, and the T1 time interval in Fig. 5 The positive edge of the waveform (transient state between low potential and high potential) refers to the occurrence of a contact action, and at the same time, the arithmetic unit 4 controls a timing unit 7 to start timing.

Next, as in step 403, when the object 200 touches the touch panel 300 for a period of time T1 (referring to the first time distance) and then leaves, the contact detection unit 3 will detect that the action of the object 200 touching the touch panel 300 ends, that is The negative edge of the waveform in Figure 5 (transient state between high potential and low potential).

Next, as shown in step 404, after the second time interval T2 elapses from the start of timing, the timing unit 7 will stop timing.

Step 405, after the timing unit 7 finishes counting, the computing unit 4 will judge whether it meets the requirement that "the first time interval T1 is less than the second time interval T2 and greater than a predetermined time interval Tmin, and there is only one contact within the second time interval T2." The condition that the time is greater than the predetermined time distance Tmin for a touch action". If not, skip to step 408, and the computing unit 4 judges that it is not a click gesture, so as to judge other actions. If yes, go to step 406 .

In order to judge the click action more accurately, a legal area (not shown) for the click action is planned on the touch panel 300, and in step 406, the contact position between the object 200 and the touch panel 300 is judged. Whether the mark (X, Y) falls within the legal area (X1~X2, Y1~Y2; X1<X2, Y1<Y2) of a click action. In step 406, if it is judged to be (X1≤X≤X2, Y1≤Y≤Y2), it means that it is indeed a single-click action. After executing step 407, a control signal representing a single-click action will be generated, as shown at the bottom of Figure 5 displayed, and transmitted to the host 400 by the encoding unit 5 and the transmission interface unit 6. If step 406 judges no, it represents a non-click action, and skips to step 408 .

To put it simply, the following conditions must be met for a click action:

(1) T2>T1

(2) T1>Tmin

(3) Within the second time interval T2, there is only one touch action with a contact time greater than the predetermined time interval Tmin

(4) X1≤X≤X2; Y1≤Y≤Y2

To sum up, the present invention starts timing when the object 200 touches the touchpad 300, and judges whether there is only one touch action within the second time interval T2, and moreover, the object 200 touches the touchpad Whether the first time distance T1 of 300 is greater than the predetermined time distance Tmin and less than the second time distance T2, and the contact position coordinates (X, Y) of the object 200 on the touch panel 300 need to fall within the legal area of the click action Due to limited conditions, it can effectively suppress noise and increase the accuracy of motion recognition. Even better, since there is no need to use the range of movement as a limiting condition for identifying whether it is a single-click action, the logic circuit inside the controller 100 can also be simplified to reduce construction costs and power consumption, and indeed achieve the present invention. the goal of.

Although the present invention has been described with reference to the current specific embodiments, those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present invention, and other modifications can be made without departing from the spirit of the present invention. Various equivalent changes and modifications, therefore, as long as the changes and modifications to the above embodiments are within the spirit of the present invention, they will all fall within the scope of the claims of the present invention.

Claims (2)

1. A single-click action recognition method for recognizing at least one object touching a touchpad, characterized in that the recognition method comprises the following steps: A) Detect that the object touches the touchpad and start timing; B) detecting the end of the object touching the touchpad, so as to obtain the first time distance between the object and the touchpad; and C) If the first time interval is less than the second time interval, and the first time interval is greater than a predetermined time interval, and within the second time interval, there is only one contact time greater than the predetermined time interval and its contact position coordinates fall When a touch action occurs within the legal area of a click action, a control signal representing the click action is generated. 2. A controller for a touch panel, used to identify an action of at least one object on the touch panel to generate at least one control signal corresponding to the action to a host, characterized in that the controller at least includes : a coordinate calculation unit, used to detect the electronic signal sent by the touch panel to calculate the coordinate position of the object touching the touch panel; a contact detection unit, used to detect the electronic signal sent by the touch panel to determine whether the object is in contact with the touch panel; a timing unit for timing when the object is in contact with the touch panel; A calculation unit, which can calculate the first time distance between the object and the touch panel when the object ends the contact action according to the result judged by the contact detection unit, and the calculation unit determines the first The time interval is less than the second time interval and greater than a predetermined time interval, and there is only one touch action within the second time interval that the contact time is greater than the predetermined time interval and its contact position coordinates fall within the legal area of a click action When generated, the arithmetic unit generates a control signal representing a click action; and An encoding unit is used to encode the control signal generated by the computing unit and the coordinate position generated by the coordinate computing unit, and transmit them to the host computer.

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