CN202267946U

CN202267946U - Capacitive screen controller capable of detecting touch force

Info

Publication number: CN202267946U
Application number: CN2011203505550U
Authority: CN
Inventors: 廖裕民
Original assignee: Fuzhou Rockchip Electronics Co Ltd
Current assignee: Rockchip Electronics Co Ltd
Priority date: 2011-09-16
Filing date: 2011-09-16
Publication date: 2012-06-06
Anticipated expiration: 2021-09-16

Abstract

The utility model provides a capacitive screen controller capable of detecting the touch force. The capacitive screen controller comprises a current detection circuit, an analogue/digital converter, a storage unit, a coordinate checking circuit and a touch strength judging circuit, wherein the storage unit is used for storing configuration information of a capacitive screen; the current detection circuit is connected with the coordinate checking circuit through the analogue/digital converter; and the storage unit and the analogue/digital converter are respectively connected with the touch strength judging circuit. The capacitive screen controller disclosed by the utility model is matched with the capacitive screen for use, so that the capacitive screen not only can provide touch coordinate information of user operation for handheld equipment, but also can provide size and grade of capacitances generated by touching of the user, and thus the handheld equipment can judge the operation action of the user more accurately.

Description

A kind of capacitance plate controller that can the senses touch dynamics

[technical field]

The utility model relates to the handheld device technical field, particularly a kind of capacitance plate controller that can the senses touch dynamics.

[background technology]

Capacitance technology touch-screen Capacity Touch Panel (CTP) is a kind of user's operative of utilizing the induction by current of human body to carry out work; Capacitance plate uses electrode that human body is used as a capacitor element on principle; As conductor near and interlayer ITO (nano indium tin metal oxide) workplace between when being coupled out the electric capacity of q.s; Just can judge the position of user's finger on screen, thereby can realize that the user uses the identification that finger is clicked and horizontal slip is moved.

We know that capacitance and anode-cathode distance are inversely proportional to, and but are directly proportional with relative area; Through this principle, capacitance plate can also be discerned the dynamics and the distance of finger presses screen, and the electric capacity that rigidly connects touch screen scene plot face when finger is differentiated with pointing the electric capacity of firmly pushing screen; When finger rigidly connects touch screen scene plot face since contact area little and the distance far away; So capacitance is less, and finger firmly to push screen be that the finger contact area enlarges, it is big that the nearer capacitance of distance also can the phase strain.Through this principle, be that can to come the judges finger through the capacitance variations that the finger of judges within a certain period of time produces be direction of motion in vertical direction in fact.

When finger touch was on metal level, because people's bulk electric field, user and touch screen surface formed with a coupling capacitance, and for high-frequency current, electric capacity is direct conductor, so finger siphons away a very little electric current from contact point.This electric current divides the electrode on four jiaos from touch-screen and flows out, and the electric current of these four electrodes of flowing through is directly proportional with the distance of pointing four jiaos, and controller passes through the accurate Calculation to these four current ratios, draws touch point position.And the coupling capacitance of user and touch screen surface formation is big more, and the corresponding electric current that produces is also just big more.

On mobile device, had large number quipments to use touch-screen as user's operation medium at present, capacitance plate has been a kind of common mobile device Hardware configuration.But the operation of capacitance plate is also very single at present, is only limited to the identification click of user on screen and the slip of level, does not have more various mode of operation.

Therefore how making the user obtain more various mode of operation, thereby improve user's operating experience, is the challenging technology that current hand-held touch opertaing device need solve.

[summary of the invention]

The technical matters that the utility model will solve is to provide a kind of capacitance plate controller that can the senses touch dynamics.

The utility model is achieved in that a kind of capacitance plate controller that can the senses touch dynamics, comprises current detection circuit, analog to digital converter, is used to store storer, the coordinate check circuit that touches the capacitance plate configuration information and touches the intensity decision circuitry; Said current detection circuit is connected with said coordinate check circuit through said analog to digital converter; Said storer, analog to digital converter all are connected with said touch intensity decision circuitry.

Further, said touch intensity decision circuitry specifically comprises a plurality of digital comparators and a CPU, and said storer is connected with a plurality of digital comparators respectively with said analog to digital converter, and said a plurality of digital comparators all are connected with said CPU.

Further, also comprise at least one configuration interface, said configuration interface is connected with said storer.

The advantage of the utility model is: the utility model will touch the capacitance plate configuration information and be stored in the storer; When the capacitance plate controller is worked; User's operation is fed back to handheld device through current detection circuit, analog to digital converter and coordinate check circuit with the touch coordinate information of user's operation, the capacitance size grade of generation when it touches dynamics that intensity decision circuitry touches capacitance plate according to configuration information and user and obtains the user and touch; Capacitance plate based on the capacitance plate controller; It can point the capacitance variations that on screen, causes according to the user; Come the variation of finger on the normal to screen direction of judges operation, thereby obtain mode of operation than click and more various normal to screen that slides; Thereby improve user's operating experience.

[description of drawings]

Fig. 1 is the structural representation of the utility model.

Fig. 2 is the structural representation that the utility model touches the intensity decision circuitry.

[embodiment]

See also shown in Figure 1; This practical a kind of capacitance plate controller that can the senses touch dynamics comprises current detection circuit 1, analog to digital converter 2, is used to store storer 3, the coordinate check circuit 4 that touches the capacitance plate configuration information and touches intensity decision circuitry 5; Said current detection circuit 1 is connected with said coordinate check circuit 4 through said analog to digital converter 2; Said storer 3, analog to digital converter 2 all are connected with said touch intensity decision circuitry 5; The utility model also comprises at least one configuration interface 6, and said configuration interface 6 is connected with said storer 3; Its configuration interface can well be accomplished the replacement that touches the capacitance plate configuration information.The current detection circuit 1 of this capacitance plate controller is connected with capacitance plate 7, and capacitance plate controller and capacitance plate 7 carry out supporting use like this.

Said in the present embodiment coordinate check circuit 4 realizes through CPU that mainly this CPU programming has the coordinate Calculation algorithm, and its CPU is that the current operator according to touch-screen goes out the coordinate information that the user touches capacitance plate.

As shown in Figure 2, said touch intensity decision circuitry 5 specifically comprises a plurality of digital comparators 51 and a CPU; Said storer 3 is connected with a plurality of digital comparators 51 respectively with said analog to digital converter 2, and said a plurality of digital comparators 51 all are connected with said CPU.

Wherein capacitance plate 7 is responsible for collecting the electric current that the contact of user on the capacitance plate surface produces, and is sent to the capacitance plate controller to current value;

Current detection circuit 1 is responsible for that the electric current that capacitance plate 7 is sent here is exchanged the commentaries on classics direct current and is handled and Filtering Processing, and the electric current after will handling then is sent to analog to digital converter 2;

Analog to digital converter 2 is responsible for converting the current signal of simulation into numerical information, and with digital current direct information coordinate check circuit that obtains 4 and touch intensity decision circuitry 5;

Coordinate check circuit 4 is responsible for coordinate information and the output according to the current operator user touch of touch-screen;

Storer 3 is responsible for receiving touch capacitance plate configuration information that configuration interfaces send into and configuration information is stored, and touches the capacitance plate configuration information and comprises what touch intensity is divided into, the current threshold scope of every grade of intensity;

As shown in Figure 2, touch intensity decision circuitry 5 and be input as from the touch current value of analog-to-digital conversion device 2 with from each of configuration information in the storer 3 and touch intensity current corresponding threshold value; Ifs circuit is maximum supports n of judgement to touch strength grade; Then circuit comprises n digital comparator 51; Be used for touch current and each grading current intensity threshold are compared, obtain and each comparative result that touches strength grade, the comparative result of all digital comparators all is sent to CPU; This circuit with touch current greater than the strength grade output of maximum, as final touch strength grade.

The concrete workflow of the utility model is following:

1, the circuit of capacitance plate controller powers on, and at first need will touch the capacitance plate configuration information through configuration interface 6 and store in the storer 3; What the configuration information content is divided into, the current threshold scope of every grade of intensity for touching intensity; The capacitance plate controller can be started working after configuration finished;

2, after the circuit of capacitance plate controller was started working, capacitance plate 7 its surface capacitance of output in real time changed the electric current variation that produces;

3, the alternating current of capacitance plate 7 outputs at first arrives current detection circuit 1, and the electric current that 1 pair of capacitance plate 7 of current detection circuit is sent here exchanges changes direct current processing and Filtering Processing, and the electric current after will handling then is sent to analog to digital converter 2;

4, analog to digital converter 2 converts the current signal of simulation into numerical information, and with the circuit of the digital current direct information coordinate computation function that obtains 4 with touch intensity decision circuitry 5;

5, coordinate check circuit 4 is responsible for coordinate information and the output according to the current operator user touch of touch-screen;

6, touch intensity decision circuitry 5 and judge according to the strength grading of configuration in the storer 3 and the current threshold of every grade of intensity which touch strength grade the electric current that the active user operates belongs to, and the judged result output that touches strength grade;

In case 7 users begin to carry out touch operation, capacitance plate 7 output currents change, and the capacitance plate controller just can be exported user's operation coordinate in real time and give handheld device with the touch strength information.

The above is merely the preferred embodiment of the utility model, and all equalizations of being done according to the utility model claim change and modify, and all should belong to the covering scope of the utility model.

Claims

One kind can the senses touch dynamics the capacitance plate controller, it is characterized in that: comprise current detection circuit, analog to digital converter, be used to store storer, the coordinate check circuit that touches the capacitance plate configuration information and touch the intensity decision circuitry; Said current detection circuit is connected with said coordinate check circuit through said analog to digital converter; Said storer, analog to digital converter all are connected with said touch intensity decision circuitry.
2. a kind of capacitance plate controller that can the senses touch dynamics according to claim 1; It is characterized in that: said touch intensity decision circuitry specifically comprises a plurality of digital comparators and a CPU; Said storer is connected with a plurality of digital comparators respectively with said analog to digital converter, and said a plurality of digital comparators all are connected with said CPU.
3. a kind of capacitance plate controller that can the senses touch dynamics according to claim 1, it is characterized in that: also comprise at least one configuration interface, said configuration interface is connected with said storer.