CN101059741A - Screen control system - Google Patents

Abstract

The invention discloses a screen control system, comprising a panel, a magnetic element, at least three magnetic sensors and a processor, wherein the magnetic element instructs pointed position on the panel, the magnetic sensors are under the panel while each one senses the magnetic field of the magnetic element at pointed position, to convert the sensed magnetic field into output voltage, and the processor is coupled with each magnetic sensor and the panel respectively to calculate the coordinate of the pointed position according to all output voltages, therefore, the screen control system can display the pointed position to user.

Description

Screen control system

Technical field

The present invention relates to a kind of screen control system (Screen control system), relate in particular to a kind of screen control system that utilizes Magnetic Sensor (Magnetic inductive sensor) to carry out location sensing.

Background technology

Recently, the application of Touch Screen (Touch screen) is more and more extensive, for example visitor's guide system, ATM (Automatic Teller Machine), point-of-sale terminals, industrial control system etc.Generally speaking, Touch Screen can be divided into following two kinds: resistance touch screen and capacitance touch control screen.

The top layer of resistance touch screen is one deck mylar (Myler), and its inboard has conducting metal to film.And the bottom of screen (promptly being attached to LCD (Liquid crystal display, LCD) on) is the glass plate of a slice coated with conductive material.Between glass plate and the mylar, then the small separation made from one deck polyester separates.Along the X-axis of glass plate, and the Y-axis of mylar, a controller is respectively arranged, can apply small voltage gradient.Whenever finger touches screen, will be together two conductive lamination, so electronic installation just can detect the X coordinate and the Y coordinate of contact.

The glass plate of capacitance touch control screen then is that conductive material is all coated on the two sides, and the outside is covered with scratch resistant filming again.Electrode around the glass plate can produce uniform low voltage electric field on the conductive layer of the outside.Inner conductive layer then can provide electromagnetic screen, and reducing noise.When finger touches screen, will produce capacitive coupling with the electric field on the conductive layer of the outside, remove small electric current and inhale.Each electrode is responsible for measuring the electric current from each corner, is made the coordinate of finger again by controller.

Yet, owing to have glass plate on the LCD of above-mentioned Touch Screen, so can reduce the output brightness of LCD.Therefore, the object of the present invention is to provide a kind of screen control system that glass plate need not be set, to address the above problem.

Summary of the invention

One of purpose of the present invention is to provide a kind of screen control system, and this screen control system utilizes Magnetic Sensor to carry out location sensing, by this, can not need on the panel of screen glass plate to be set, and then keep the output brightness of panel.

According to a preferred specific embodiment, screen control system of the present invention (Screen control system) comprises panel (Panel), magnetic component (Magnetic member), at least three Magnetic Sensors (Magneticinductive sensor) and processing unit (Processing unit).Magnetic component is used to indicate on the panel ad-hoc location.These Magnetic Sensors are arranged under the panel, each Magnetic Sensor respectively in order to the sensing magnetic component in the magnetic field of ad-hoc location (Magnetic field), and the magnetic field that senses is converted to output voltage.Processing unit couples mutually with each Magnetic Sensor and panel respectively, in order to according to all output voltages, calculates the coordinate (Coordinate) of ad-hoc location.By this, screen control system can the ad-hoc location that magnetic component is indicated be shown to the user and sees and look.

Therefore,, glass plate must be set on panel push, make the output brightness of panel can keep stable for the user because screen control system of the present invention utilizes Magnetic Sensor to carry out location sensing.

Can be further understood by the following detailed description and accompanying drawings about the advantages and spirit of the present invention.

Description of drawings

Fig. 1 is the external view that illustrates according to the screen control system of of the present invention one preferred specific embodiment;

Fig. 2 is the front elevation that illustrates the panel among Fig. 1;

Fig. 3 is the functional block diagram that illustrates the screen control system among Fig. 1; And

Fig. 4 is the graph of a relation that illustrates output voltage and rotational angle.

The simple symbol explanation

1: screen control system 10: panel

12: magnetic component 14a, 14b, 14c: Magnetic Sensor

16: processing unit e, f, Ra, Rb, Rc: distance

P: ad-hoc location B: magnetic field

Va, Vb, Vc: output voltage X, Y: coordinate

Embodiment

See also Fig. 1 to Fig. 3, Fig. 1 is the external view that illustrates according to the screen control system 1 of of the present invention one preferred specific embodiment.Fig. 2 is the front elevation that illustrates the panel 10 among Fig. 1.Fig. 3 is the functional block diagram that illustrates the screen control system 1 among Fig. 1.Screen control system (Screen controlsystem) 1 comprises panel (Panel) 10,12, at least three Magnetic Sensors of magnetic component (Magnetic member) (Magnetic inductive sensor) and processing unit (Processing unit) 16.These Magnetic Sensors comprise the first Magnetic Sensor 14a, the second Magnetic Sensor 14b and the 3rd Magnetic Sensor 14c, are arranged at the different corner under the panel 10 respectively, as Fig. 1 and shown in Figure 2.

In this embodiment, the first Magnetic Sensor 14a is defined as true origin, and the distance of second Magnetic Sensor 14b to the first Magnetic Sensor 14a is e, and the distance of the 3rd Magnetic Sensor 14c to the first Magnetic Sensor 14a is f.Be noted that screen control system 1 also can be provided with more than three Magnetic Sensors, to promote the accuracy of location sensing.The first Magnetic Sensor 14a, the second Magnetic Sensor 14b and the 3rd Magnetic Sensor 14c are two Magnetic Sensor.

As shown in Figure 3, processing unit 16 couples mutually with Magnetic Sensor 14a, 14b, 14c and panel 10 respectively.

In this embodiment, magnetic component 12 can be magnet or other like, and panel 10 can be liquid crystal panel or other like.Preferably, magnetic component 12 can be installed in the pen, to make things convenient for user's use of taking.

As shown in Figure 1, the user can be with the certain distance of magnetic component 12 near panel 10 tops, with indication ad-hoc location P on panel 10.In this embodiment, the distance definition of ad-hoc location P to the first Magnetic Sensor 14a is Ra, and the distance definition of ad-hoc location P to the second Magnetic Sensor 14b is Rb, and the distance definition of ad-hoc location P to the three Magnetic Sensor 14c is Rc, as shown in Figure 2.

Then, each Magnetic Sensor 14a, 14b, 14c can sense magnetic component 12 respectively in the magnetic field of ad-hoc location P (Magnetic field) B, and the magnetic field that senses is converted to output voltage.In this embodiment, the output voltage of first Magnetic Sensor 14a output is defined as Va, and the output voltage of second Magnetic Sensor 14b output is defined as Vb, and the output voltage of the 3rd Magnetic Sensor 14c output is defined as Vc.

Afterwards, processing unit 16 can be according to output voltage V a, Vb, Vc, with process of iteration (Iteration method) calculate ad-hoc location P coordinate (Coordinate) (X, Y).Its computing formula is as follows:

Formula one: $\left\{\begin{array}{c}\mathrm{Ra}-\mathrm{Rb}=\sqrt[3]{\frac{\mathrm{\α}}{\mathrm{Va}-\mathrm{Vb}}}\·\·\·\·\·\·A\\ \mathrm{Rb}-\mathrm{Rc}=\sqrt[3]{\frac{\mathrm{\α}}{\mathrm{Vb}-\mathrm{Vc}}}\·\·\·\·\·\·B\\ \mathrm{Rc}-\mathrm{Ra}=\sqrt[3]{\frac{\mathrm{\α}}{\mathrm{Vc}-\mathrm{Va}}}\·\·\·\·\·\·C\end{array}\right.;$ And

Formula two: $\left\{\begin{array}{c}{X}^2+Y^2={\mathrm{Ra}}^2\·\·\·\·\·\·\left(D\right)\\ {(X-e)}^2+Y^2={\mathrm{Rb}}^2\·\·\·\·\·\·\left(E\right)\\ X^2+{(Y-f)}^2={\mathrm{Rc}}^2\·\·\·\·\·\·\left(F\right)\end{array}\right..$

(A) formula in the formula one, (B) formula and (C) formula is non-is interdependent equation.In addition, α can be predetermined constant or calculates via following formula:

Formula three: $B=\mathrm{\α}\frac{1}{R^3},$ Wherein R represents the preset distance on the panel 10.

In this embodiment, processing unit 16 can be estimated a Ra value earlier, and with (A) formula in its substitution formula one, to calculate the Rb value.Then, processing unit 16 can be with (B) formula in the Rb value substitution formula one, to calculate the Rc value.Then, processing unit 16 can be with Ra, Rb, Rc substitution formula two respectively, with calculate three groups of coordinates (X1, Y1), (X2, Y2), (X3, Y3).Then, processing unit 16 can with coordinate (X1, Y1), (X2, Y2), (X3, Y3) average computation goes out one group of average coordinates (Xavg Yavg), and calculates a new Ra ' value ${\mathrm{Ra}}^{\′}=\sqrt{X_{\mathrm{avg}}^2+Y_{\mathrm{avg}}^2}.$ Afterwards, processing unit 16 can calculate Rb ' value and Rc ' value according to Ra ' again, and repeats the aforementioned calculation process.In like manner, during beginning, processing unit 16 also can be estimated a Rb value or Rc value earlier, to carry out the subsequent calculations process.

Work as Ra '-Ra＜10mm, Rb '-Rb＜10mm, and Rc '-Rc＜10mm, processing unit 16 can stop computing, and the corresponding coordinate of output ad-hoc location P (X, Y).By this, screen control system 1 can be shown to magnetic component 12 indicated ad-hoc location P the user and sees and to look.

In addition, when magnetic component 12 when ad-hoc location P rotates, processing unit 16 can be judged the direction (angle) that magnetic component 12 rotates according to the variation of the output voltage of Magnetic Sensor 14a, 14b or 14c output.See also Fig. 4, Fig. 4 is the graph of a relation that illustrates output voltage and rotational angle.As shown in Figure 4, when the user rotates magnetic component 12, the output voltage of Magnetic Sensor (X-axis and Y-axis) can produce positive and negative variation.By this, screen control system 1 can define different functions, shown in following table one according to the direction (angle) of magnetic component 12 rotations.

Table one

The magnet direction	Output voltage		Function
				X-axis	Y-axis
	Constant	+				+	Do not have
Turn left			+	-	Left mouse button
	Turn right	-				+	Right mouse button

In another preferred specific embodiment, Magnetic Sensor 14a of the present invention, 14b, 14c also can be three Magnetic Sensor.

Compared to prior art, because screen control system of the present invention utilizes Magnetic Sensor to carry out location sensing, glass plate must be set on panel push for the user, make the output brightness of panel can keep stable.In addition, the present invention can define different function (as the right and left key of mouse) according to the direction (angle) of magnetic component 12 rotations, and is convenient more for the user.

By the detailed description of above preferred specific embodiment, hope can be known description feature of the present invention and spirit more, and is not to come category of the present invention is limited with above-mentioned disclosed preferred specific embodiment.On the contrary, its objective is that hope can contain being arranged in the scope of the present invention of various changes and tool equality.Therefore, scope of the present invention should be done the broadest explanation according to above-mentioned explanation, contains the arrangement of all possible change and tool equality to cause it.

Claims (10)

1, a kind of screen control system comprises:

Panel;

Magnetic component is used to indicate ad-hoc location on this panel;

At least three Magnetic Sensors are arranged under this panel, each those Magnetic Sensor respectively in order to this magnetic component of sensing in the magnetic field of this ad-hoc location, and this magnetic field that will sense is converted to output voltage; And

Processing unit couples mutually with those Magnetic Sensors and this panel respectively, in order to according to those output voltages, calculates the coordinate of this ad-hoc location.

2, screen control system as claimed in claim 1, wherein those Magnetic Sensors comprise first Magnetic Sensor, second Magnetic Sensor and the 3rd Magnetic Sensor, and this first Magnetic Sensor, this second Magnetic Sensor and the 3rd Magnetic Sensor are arranged at the different corner under this panel respectively.

3, screen control system as claimed in claim 2, wherein this ad-hoc location to the distance definition of this first Magnetic Sensor is Ra, this ad-hoc location to the distance definition of this second Magnetic Sensor is Rb, this ad-hoc location to the distance definition of the 3rd Magnetic Sensor is Rc, this output voltage of this first Magnetic Sensor output is defined as Va, this output voltage of this second Magnetic Sensor output is defined as Vb, this output voltage of the 3rd Magnetic Sensor output is defined as Vc, and Ra, Rb, Rc and Va, Vb, Vc have following relation:

$\mathrm{Ra}-\mathrm{Rb}=\sqrt[3]{\frac{\mathrm{\α}}{\mathrm{Va}-\mathrm{Vb}}},$ $\mathrm{Rb}-\mathrm{Rc}=\sqrt[3]{\frac{\mathrm{\α}}{\mathrm{Vb}-\mathrm{Vc}}},$ $\mathrm{Rc}-\mathrm{Ra}=\sqrt[3]{\frac{\mathrm{\α}}{\mathrm{Vc}-\mathrm{Va}}};$

Wherein, α represents predetermined constant.

4, screen control system as claimed in claim 3, wherein this coordinate comprises ordinate X and horizontal ordinate Y, this first Magnetic Sensor is defined as true origin, this second Magnetic Sensor to the distance definition of this first Magnetic Sensor is e, the 3rd Magnetic Sensor is f to the distance definition of this first Magnetic Sensor, and Ra, Rb, Rc, X, Y and e, f have following relation:

X ²+Y ²＝Ra ²，(X-e) ²+Y ²＝Rb ²，X ²+(Y-f) ²＝Rc ²。

5, screen control system as claimed in claim 4, wherein this processing unit goes out this coordinate of this ad-hoc location with iteration Method.

6, screen control system as claimed in claim 1, wherein when this magnetic component when this ad-hoc location rotates, this processing unit can be judged the direction that this magnetic component rotates according to the variation of this output voltage of each those Magnetic Sensors output.

7, screen control system as claimed in claim 1, wherein each those Magnetic Sensor is two a Magnetic Sensor.

8, screen control system as claimed in claim 1, wherein each those Magnetic Sensor is three a Magnetic Sensor.

9, screen control system as claimed in claim 1, wherein this magnetic component is a magnet.

10, screen control system as claimed in claim 1, wherein this panel is a liquid crystal panel.

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