CN1949160B - Method for compensating induction quantity of touch pad inductor - Google Patents

Abstract

A method for compensating the inductive quantity of a touch panel sensor is provided, wherein a firmware operation is performed according to the distribution relationship of the basic capacitance of the traces in the touch panel sensor, so that the inductive quantity of the touch panel sensor is symmetrical and linearly equal, or the calculated position value does not generate an offset. The firmware operation includes operating the inductive quantity and the position value, adjusting the frequency of charging and discharging the traces, or adjusting the current size of charging and discharging the traces.

Description

Compensation method for sensing amount of touch panel sensor

technical field

The invention relates to a touch panel, in particular to a method for compensating the inductance of a sensor of the touch panel.

Background technique

Due to its small size, low cost, low power consumption and long service life, touch panels are widely used in various electronic products, such as notebook computers, mice, MP3 players, and even mobile phones, as input devices. Users only need to slide or touch objects (such as conductive objects such as fingers or stylus pens) on the panel to make the cursor move relative or with absolute coordinates to complete text writing, scrolling windows and virtual buttons. and other inputs. Most of the known touch panel sensors have a symmetrical structure, such as the square structure shown in FIG. It is symmetrical, and the sensing amount caused by the object on the touch panel sensor is also symmetrical and linearly equal, as shown in FIG. 2 . However, as the application is different, the shape and structure of the touch panel sensor are also different, resulting in an asymmetric touch panel sensor. At least one of the thickness of each layer of the device, the area of the trace, and the distance from the ground layer is asymmetrical. The fundamental capacitance of a trace is proportional to the ratio of the area of the trace to the distance of the trace from the ground plane:

C=ε*(A/d) Formula 1

Among them, C represents the basic capacitance, ε represents the dielectric coefficient, A represents the area size of the trace, and d represents the distance between the trace and the ground plane. And the sensing amount caused by the object on the touchpad sensor:

S is proportional to (ΔC/C) formula 2

Wherein, ΔC is the amount of capacitance change caused by the object on the sensor. Therefore, the area of the trace and the distance between the trace and the ground plane will affect the size of its basic capacitance. Taking the circular structure shown in FIG. 3 as an example, the lengths of the traces X0 to X6 of the sensor 100 are different, so that the areas of the traces X0 to X6 are not equal. Similarly, the areas of the traces Y0 to Y6 are also not equal. , it can be seen from formula 1 that when the distances between the traces and the ground plane are equal, the larger the area, the larger the basic capacitance, resulting in an asymmetric distribution of the basic capacitance of the traces on the inductor 100 . It can be seen from formula 2 that when the object is operated on the sensor 100, the inductances generated at different positions are different due to the different basic capacitances of the traces. As shown in FIG. 4, the inductances are asymmetrical and not linearly equal The phenomenon of the object causes misjudgment of the action when the object is operated or causes an offset when calculating the position of the object.

Therefore, a compensation method that makes the inductance of the touch panel sensor symmetrical and linearly equal is desirable.

Contents of the invention

The main purpose of the present invention is to provide a compensation method for making the inductance of the touch panel sensor symmetrical and linearly equal.

According to the present invention, a method for compensating the inductance of a touch panel sensor includes calculating the basic capacitance of each trace in the touch panel sensor, calculating the distribution relationship of the basic capacitance, and performing toughening according to the distribution relationship. Bulk operation, so that the inductance of the traces is symmetrical and linearly equal, and the firmware operation includes computing the inductance or adjusting the frequency or current for charging and discharging the traces.

According to the present invention, a method for compensating the inductance of a touch panel sensor includes calculating the position value of an object on the touch panel sensor, calculating the distribution relationship of the inductive quantities of each trace in the touch panel sensor, And performing firmware calculations according to the distribution relationship, so that there will be no offset between the position value and the corresponding position value of the object on the touch panel sensor, the firmware calculation includes increasing or decreasing the position value .

The present invention utilizes the operation of the firmware, such as performing calculations on the inductance or adjusting the frequency or current of charging and discharging the traces, so that the inductances of the traces on the same layer or different layers are symmetrical and linearly equal, or according to the inductance of the traces The distribution relationship of the object is calculated, and the calculation is performed on the calculated position value, so that the touchpad sensor can avoid the misjudgment of the movement when the object is operated or the offset caused by the calculation of the object position value.

Description of drawings

Figure 1 shows a schematic diagram of a square touch panel sensor;

Figure 2 shows the amount of sensing caused by an object on a square touchpad sensor;

FIG. 3 shows a schematic diagram of a circular touch panel sensor;

Figure 4 shows the amount of sensing caused by an object on the circular touchpad sensor;

Fig. 5 is a flowchart of the first embodiment of the present invention;

Figure 6 is a distribution diagram of the basic capacitance of the trace:

Fig. 7 is a distribution relationship diagram of the trace induction quantity;

Fig. 8 is a diagram showing the distribution relationship of the stitch sensing quantity after the firmware operation; and

Fig. 9 is a flowchart of the second embodiment of the present invention.

Symbol Description:

100 round touchpad sensor

200 flow chart

210 Calculate the basic capacitance of each trace in the touchpad sensor

220 calculating the distribution relationship of the basic capacitance

230 for firmware operation

300 flow chart

310 Calculate the position value of the object on the touchpad sensor

320 Calculation of the distribution relationship of the trace induction on the same layer

330 for firmware operation

Detailed ways

5 is a flow chart 200 of an embodiment of the present invention. Step 210 calculates the basic capacitance of each trace in the touch panel sensor according to formula 1. Step 220 calculates the distribution relationship of the basic capacitance. Step 230 calculates the basic capacitance according to step 220. The generated distribution relationship is subjected to firmware calculation, so that the sensing values of each trace in the touch panel sensor are symmetrical and linearly equal. Referring to the circular structure of the touch panel sensor 100 shown in FIG. 3 , the touch panel sensor 100 has traces X0 to X6 and Y0 to Y6 whose directions are orthogonal to each other. Basic capacitance, the distribution of its basic capacitance is shown in Figure 6, according to formula 2, when the object operates on the sensor 100, because the basic capacitance of each trace is different, so the inductance generated in different traces is different, as shown in Fig. As shown in FIG. 7, the firmware operation is performed according to the distribution relationship shown in FIG. 6, so that the inductance of the stitches is symmetrical and linearly equal, as shown in FIG. The calculation is performed on the traces Y0 to Y6 in the same way, so that the traces Y0 to Y6 have symmetrical and linearly equal inductances, and then the inductances of the touch panel sensor 100 are symmetrical and linearly equal. In one embodiment, the firmware calculation includes calculating the inductance of each trace (such as X0 to X6 and Y0 to Y6) based on the distribution relationship of the basic capacitance, for example, the inductance is low (that is, the basic capacitance is large) The traces (such as X2, X3, X4, Y2, Y3, and Y4) are added or multiplied according to the distribution relationship of the basic capacitance, or the traces with high inductance (that is, small basic capacitance) (such as X0, X1, X5, X6, Y0, Y1, Y5 and Y6), subtract or divide according to the distribution relationship of the basic capacitance, so that the inductances of the traces X0 to X6 and Y0 to Y6 are symmetrical and linearly equal. In another embodiment, the firmware operation includes adjusting the charging and discharging frequency of each trace according to the distribution relationship of the basic capacitance of each trace (such as X0 to X6 and Y0 to Y6), for example, for a low inductance (that is, a basic Larger capacitance) traces (such as X2, X3, X4, Y2, Y3 and Y4), according to the distribution relationship of the basic capacitance to increase the frequency of charge and discharge, or for traces with high inductance (that is, small basic capacitance) (such as X0, X1, X5, X6, Y0, Y1, Y5, and Y6), the frequency of charging and discharging is reduced according to the distribution relationship of the basic capacitance, so that the inductances of the traces X0 to X6 and Y0 to Y6 are symmetrical and linearly equal. In other embodiments, the firmware operation includes adjusting the magnitude of the charging and discharging current for each trace according to the distribution relationship of the basic capacitance of each trace (such as X0 to X6 and Y0 to Y6), for example, for a low inductance (that is, basically Larger capacitance) traces (such as X2, X3, X4, Y2, Y3 and Y4), according to the distribution relationship of the basic capacitance to increase the charge and discharge current, or for traces with high inductance (that is, small basic capacitance) (such as X0, X1, X5, X6, Y0, Y1, Y5, and Y6), according to the distribution relationship of the basic capacitance, the charging and discharging current is reduced, so that the inductances of the traces X0 to X6 and Y0 to Y6 are symmetrical and linearly equal.

FIG. 9 is a flow chart 300 of another embodiment of the present invention. Step 310 calculates the position value of the object on the touch panel sensor. Step 320 calculates the distribution relationship of the induction between the same layer of stitches according to formulas 1 and 2. Step 330 performs firmware calculations according to the distribution relationship generated in step 320 , so that there is no offset between the calculated position value and the corresponding position value of the object on the touch panel sensor. In one embodiment, the firmware operation in step 330 includes increasing or decreasing the position value according to the distribution relationship of the sensing quantity.

In different embodiments, the compensation method of the inductance of the touch panel sensor is combined with the methods described in the above embodiments, so that the traces between the same layer and different layers have symmetrical and linearly equal inductances, or So that there will be no offset between the calculated position value and the corresponding position value of the object.

Claims (11)

1. the compensation method of the induction amount of a touch control panel inductor comprises the following steps:

Calculate the basic electric capacity of each stitching in this touch control panel inductor, thereby obtain the distribution relation of described basic electric capacity; And

Carry out the firmware computing according to this distribution relation, make the induction amount symmetry and the linearity of described stitching equate.

2. the method for claim 1, wherein this firmware computing comprises with multiplication and division or plus-minus method the induction amount of described stitching is done computing.

3. the method for claim 1, wherein this firmware computing comprises the frequency that adjustment discharges and recharges described stitching.

4. method as claimed in claim 3, wherein this adjustment frequency that described stitching is discharged and recharged comprises the high stitching of this basic electric capacity is promoted the frequency that this discharges and recharges.

5. the method for claim 1, wherein this firmware computing comprises the size of current that adjustment discharges and recharges described stitching.

6. method as claimed in claim 5, wherein this adjustment size of current that described stitching is discharged and recharged comprises the high stitching of this basic electric capacity is promoted the electric current that this discharges and recharges.

7. the method for claim 1, wherein said stitching is positioned at same inductive layer.

8. the method for claim 1, wherein said stitching is positioned at different inductive layers.

9. the compensation method of the induction amount of a touch control panel inductor comprises the following steps:

Calculate the positional value of an object on this touch control panel inductor;

Calculate the basic electric capacity of each stitching in this touch control panel inductor, be proportional to the distribution relation that the capacitance change of object on inductor and the ratio of basic electric capacity obtain the induction amount of described each stitching according to the induction amount; And

According to this distribution relation this positional value is carried out the firmware computing, make through this positional value and this object after the computing and can not produce side-play amount between the pairing positional value on this touch control panel inductor.

10. method as claimed in claim 9, wherein this firmware computing comprises increases or lowers this positional value.

11. method as claimed in claim 9, wherein said stitching is positioned at same inductive layer.

Images