KR100475114B1 - Equipment for Measuring Linearity of Touch Panel and the Method of Measuring with using the same - Google Patents

Abstract

The present invention relates to a linearity measuring device of a touch panel capable of inspecting linearity linearly in a region adjacent to an outer portion where local distortion is well generated, and a linearity measuring method of a touch panel using the same.

The linearity measuring instrument of the touch panel of the present invention may be configured to measure the first and second linearity measuring pens spaced apart from each other by a predetermined distance, and the first and second linearity measuring pens so that the first and second linearity measuring pens maintain the same distance. A pen connection bar that can be fixed, a pen connection bar movement line that can move the pen connection bar, and a jig (JIG) in which a touch panel in which linearity measurement is made are positioned, the linearity measuring method using the same Applying a first voltage and a second voltage to the X-axis or Y-electrode bars of the touch panel, detecting a reference voltage line corresponding to an intermediate value of the first and second voltages, and the left and right X- Simultaneously touching the first and second lines spaced apart at equal intervals from the electrode bar or the upper and lower Y-electrode bars; and detecting the detection line corresponding to an intermediate voltage value between the first line and the second line. And determining the linearity in comparison with the voltage line.

Description

Equipment for measuring linearity of touch panel and measuring method of linearity using touch panel {Equipment for Measuring Linearity of Touch Panel and the Method of Measuring with using the same}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a touch panel, and more particularly, to a linearity measuring device of a touch panel capable of inspecting linearity linearly in a region adjacent to an outside where local distortion is easily generated, and a linearity measuring method of a touch panel using the same. .

In order to efficiently use various electronic devices, a touch panel for inputting a signal on a display surface of a display device without a remote controller or a separate input device is widely used. That is, the display surface of an electronic notebook, a flat panel display device such as a liquid crystal display device (LCD), a plasma display panel (PDP), an electroluminescence (EL), and an image display device such as a cathode ray tube (CRT). The touch panel is installed. Accordingly, when the user presses the surface with a pen or finger on the screen of the image display device, information corresponding to the position is input.

The touch panel may be classified into a resistive type, a capacitive type, and an electromagnetic inductive type (EM) according to a method of sensing a touch.

The basic structure of the touch panel of the resistive type touch panel of the above touch panel is laminated with an upper transparent substrate on which the upper electrode is formed and a lower transparent substrate on which the lower electrode is formed with a predetermined space. Therefore, when a certain point of contact, such as a pen or a finger, is brought into contact with the upper substrate on which the upper electrode is formed, the upper electrode formed on the upper substrate and the lower electrode formed on the lower substrate are energized with each other, and the resistance of the position After reading the voltage value changed by the value, the device finds the position coordinate according to the change of the potential difference.

In addition, the basic structure of the capacitive touch panel of the above touch panel is to install a film with a transparent electrode on the liquid crystal panel and to apply a voltage to each corner or corner of the film to generate a uniform electric field on the transparent electrode. When a finger or a conductive stylus is applied to contact the device, a voltage drop is generated to find a position coordinate.

Referring to the conventional touch panel device as described above with reference to the accompanying drawings as follows.

1 is an exploded perspective view illustrating a conventional touch panel and a block diagram illustrating a power supply control unit of a touch panel, and FIG. 2 is a diagram illustrating power supply to respective metal electrodes corresponding to a position detection method of a conventional touch panel.

In the conventional touch panel device, as shown in FIG. 1, the touch panel 10 outputting the coordinate signal of the touch point, and the coordinate signal from the touch panel 10 by controlling the driving of the touch panel 10. And a system 40 for performing a corresponding command in response to the coordinate values from the touch panel controller 30. .

The touch panel 10 is provided with an upper film 12 and a lower film 16, the first transparent conductive layer 14 is formed on the upper film 12 of the surface facing each other, the surface facing each other A second transparent conductive layer 18 is formed on the lower film 16, so that the upper film 12 and the lower film 16 are spaced at a predetermined interval.

The upper film 12 and the lower film 16 are bonded by the adhesive 22 at the outer portion of the non-touch area and spaced apart by the height of the adhesive 22. In addition, a plurality of dot spacers 20 may be formed on the first transparent conductive layer 14 or the lower film 16 of the upper film 12 to separate the upper film 12 from the lower film 16 in the touch area. It is further formed on the second transparent conductive layer 18.

As the upper film 12 pressed by a pen or finger, a transparent film such as polyethylene terephthalate (PET) is mainly used, and the lower film 16 is a transparent film of the same material as the upper film 12 or a glass substrate. Or a plastic substrate is used. The first and second transparent conductive layers 14 and 18 formed on the upper and lower films 12 and 16 may be indium-tin-oxide (ITO), indium-zinc-oxide (IZO), or indium-tin (ITZO). -Zinc-Oxide) is used.

The touch panel 10 includes an X-electrode bar 15 connected to both sides of the first transparent conductive layer 14 to apply a voltage to the first transparent conductive layer 14 in the X-axis direction. The second transparent conductive layer 18 further includes a Y-electrode bar 19 connected to both sides of the second conductive layer 18 to apply a voltage in the Y-axis direction. The X-electrode bar 15 includes a first X-electrode bar 15a and a ground voltage GND for supplying a driving voltage Vcc so that current flows in the X-axis direction to the first transparent conductive layer 14. It consists of a second X-electrode bar (15b) for supplying. The Y-electrode bar 19 has a first Y-electrode bar 19a and a ground voltage GND which supply a driving voltage Vcc to allow a current to flow in the Y-axis direction to the second transparent conductive layer 16. It consists of a second Y-electrode bar 19b for supplying the.

When the pen or finger presses the upper film 12 to contact the first transparent conductive layer 14 with the second transparent conductive layer 18, the touch panel 10 may be configured to correspond to the first and second contact points. The resistance value varies depending on the sheet resistance of the transparent conductive layers 14 and 18. In addition, since the current or voltage is changed according to the variable resistance value, the first or second Y-electrode bar 19a connected to the second transparent conductive layer 18 may change the current or voltage. or 19b) to output the X-axis coordinate signal, and output the Y-axis coordinate signal through the first or second X-electrode bars 15a or 15b connected to the first transparent conductive layer 14. In this case, the touch panel 10 sequentially outputs the X-axis coordinate signal and the Y-axis coordinate signal under the control of the touch panel controller 30.

Specifically, as shown in FIG. 2, when the driving voltage Vcc and the ground voltage GND are supplied to the X-electrode bar 15 through the first switch 24, the first and second touch panels 10 are provided. The touch panel controller 30 transmits an X-axis coordinate signal through the second Y-electrode bar 19b and the second switch 26 in response to a resistance variable by a point where the transparent conductive layers 14 and 18 contact. Will output via

Similarly, although not shown, the touch panel 10 may be configured to have a first voltage when the driving voltage Vcc and the ground voltage GND are supplied to the Y-electrode bar 19 through the first and second switches 24 and 26. And a Y-axis coordinate signal through the second X-electrode bar 15b in response to a resistance value varying by a point where the second transparent conductive layers 14 and 18 contact.

Here, the first switch 24 may drive the driving voltage Vcc in response to the control signal CS from the touch panel controller 30 to the first X-electrode bar 15a or the first Y-electrode bar 19a. ) Will be supplied. The second switch 26 transfers the ground voltage GND to the second X-electrode bar 15b or the second Y-electrode bar 19b in response to the control signal CS from the touch panel controller 30. Outputs the voltage of the supplied or touched position.

The touch panel controller 30 detects the coordinate values according to the X-axis and Y-axis coordinate signals of the touch point output from the touch panel 10 and supplies them to the system 40. In addition, the touch panel controller 30 controls the first and second switches 24 and 26 according to the X-axis coordinate mode and the Y-axis coordinate mode to control power supply (Vcc, GND) to the touch panel 10. Done.

To this end, the touch panel controller 30 includes an analog-to-digital converter (hereinafter referred to as an ADC) 32 and an ADC 32 for converting X-axis and Y-axis coordinate signals from the touch panel 10 into digital data. The microcomputer 34 which detects the coordinate value by the combination of X-axis and Y-axis coordinate data from the microcomputer 34 and outputs it to the system 40, and the interface part which relays the coordinate value from the microcomputer 34, and supplies it to the system 40. FIG. 36 is provided.

The ADC 32 converts each of the X-axis coordinate signal and the Y-axis coordinate signal sequentially supplied from the touch panel 10 into digital data and outputs the digital data.

The microcomputer 34 combines the X-axis and Y-axis coordinate data sequentially supplied from the ADC 32 to detect the coordinate value of the touch point of the touch panel 10, and converts the detected coordinate value into the interface unit 36. To the system 40 through. In addition, the microcomputer 34 generates the control signal CS at regular intervals so that the first switch 24 sets the driving voltage Vcc to the first X-electrode bar 15a or the first Y-electrode bar 19a. The second switch 26 supplies the ground voltage GND to the second X-electrode bar 15b or the second Y-electrode bar 19b and outputs a voltage according to the touch.

The system 40 detects a coordinate value supplied from the touch panel controller 30 and executes a corresponding command or executes an application program related thereto by the coordinate value. The system 40 also supplies power signals and video data for a display (not shown) on which the touch panel 10 is mounted on a surface.

As described above, the conventional touch panel device detects a coordinate value pressed by a pen or a finger and transmits the coordinate value to the system 40 to perform a command corresponding to the coordinate value in the system 40.

FIG. 3 is a diagram illustrating a linearity distortion shown locally when a touch panel is inspected by a conventional method for inspecting linearity of a touch panel.

As shown in FIG. 3, in the conventional method for measuring linearity of a touch panel, a voltage is sensed through a probe by taking points of the entire area of the touch panel at regular intervals.

In the case of a normally manufactured resistive touch panel, the driving voltage Vcc and the ground voltage (i) may be applied to the first and second X-electrode bars 15a and 15b and the first and second Y-electrode bars 19a and 19b. When GND) is connected, the resistance value is proportional to the distance between the two electrode bars, so that the voltage value is also proportionally measured. Some cracks of the first transparent conductive layer 14 or the second transparent conductive layer 18 and the like are measured. An area in which linearity cannot be maintained may occur due to a crack or the like.

In FIG. 3, when the voltage is measured at regular intervals, when the linearity is not maintained between the measurement sections, this problem cannot be detected.

In particular, in the case of the touch panel 10, a plurality of processes are performed by forming an electrode bar at an edge portion or an adhesive coating process rather than a center portion, and cracks are likely to occur, thereby causing distortion in such linearity. easy to do.

Here, the flexible printed cable (FPC) 25, which is not described, applies a voltage signal to the first and second X-electrode bars 15a and 15b and the third and fourth Y-electrode bars 19a and 19b. It is a cable formed with lines connected to the driving voltage or the ground voltage in order to.

4 is a graph illustrating a range in which linearity distortion is possible and a conventional linearity measuring method.

As shown in FIG. 4, in the conventional linearity measurement method, when the voltage values at two predetermined points of the touch panel are Vb and Va, respectively, how much difference is there between Vx where the voltage values between the two points maintain linearity. It is made to check.

That is, the linearity distortion degree is defined as the difference between the voltage value Vc and Vx having an ideal linearity between the two points when the voltage value of one point between the two points is Vc, as the voltage difference Vb-Va between the two points. It is divided by the equation.

That is, linearity distortion degree (%) = (Vx-Vc) / (Vb-Va) x100.

In this case, the linearity distortion is in the range of ± 1.5%, and the touch panel has an effective characteristic, and when the product is released into the product and has a higher linearity distortion degree, it is omitted from the product.

The linearity measuring method of the conventional touch panel as described above has the following problems.

In order to manufacture a normally working touch panel, only products having linearity distortion within a range are released, and products having a range of linearity distortion are missed in the process through the linearity test. In this case, a measurement point is required for a more accurate linearity test. The number of s should be increased as much as possible. However, since the time input to the linearity check during the process is limited in terms of cost, the conventional linearity test method that is performed within a limited time has a problem that it is defenseless against the linearity distortion between the measuring points.

The present invention has been made to solve the above problems and the linearity measuring equipment of the touch panel and the linearity measurement of the touch panel using the same can check the linearity linearly to the portion adjacent to the outside where local distortion is well generated The purpose is to provide a method.

The linearity measuring equipment of the touch panel of the present invention for achieving the above object is the first, second linearity measuring pen and the first, second linearity measuring pen spaced apart from each other by a predetermined interval so that the first and second linearity measuring pen to maintain the same interval 1, a pen connecting bar for fixing the second linearity measuring pen, a pen connecting bar moving line for moving the pen connecting bar, and a jig in which a touch panel for measuring linearity is located is formed. Has its features.

The difference between the voltage line detected when the first and second linearity measuring pens are touched on the touch panel while maintaining the same distance, and the center reference voltage lines of the first and second linearity measuring pens. And a control means for determining the effective degree of linearity of the touch panel.

In addition, the method for measuring the linearity of the touch panel of the present invention for achieving the same object is the step of applying a first voltage and a second voltage to the left and right X-electrode bars of the touch panel, respectively, and the intermediate Detecting a reference voltage line corresponding to the value, simultaneously touching the first line and the second line spaced apart from the left and right X-electrode bars at equal intervals, and corresponding to an intermediate voltage value of the first line and the second line And comparing the detected detection line with the reference voltage line to determine linearity.

The touch of the first line and the second line is made by keeping the same distance from the reference voltage line.

The determining of the linearity is performed by determining a distance from the detection line to the reference voltage line.

The linearity NG is determined when the distance from the detection line to the reference voltage line exceeds an effective range.

The effective range is within ± reference voltage x 0.75%.

The determination of the linearity is made at the controller of the touch panel.

The first line and the second line are spaced 3 to 5 mm apart from the left and right X-electrode bars, respectively.

In addition, the linearity measurement method of the touch panel to achieve the same object is the step of applying a first voltage and a second voltage to the upper and lower Y-electrode bars of the touch panel, and corresponds to the intermediate value of the first voltage and the second voltage Detecting a reference voltage line; simultaneously touching the first and second lines spaced apart from each other by the upper and lower Y-electrode bars; and a detection line corresponding to an intermediate voltage value of the first and second lines. It is another feature that comprises the step of determining the linearity by comparing with the reference voltage line.

The touch of the first line and the second line is made by keeping the same distance from the reference voltage line.

The determining of the linearity is performed by determining a distance from the detection line to the reference voltage line.

The linearity NG is determined when the distance from the detection line to the reference voltage line exceeds an effective range.

The effective range is within ± reference voltage x 0.75%.

The determination of the linearity is made at the controller of the touch panel.

The first line and the second line are spaced 3 to 5 mm apart from the upper and lower Y-electrode bars, respectively.

Hereinafter, the linearity measuring device of the present invention and a linearity measuring method of a touch panel using the same will be described in detail with reference to the accompanying drawings.

5 is an exploded perspective view showing a touch panel of the present invention and a block diagram showing a power supply control unit of the touch panel.

As shown in FIG. 5, the touch panel of the present invention controls the driving of the touch panel 50, which outputs the coordinate signal of the touch point, and the coordinate values according to the coordinate signal from the touch panel 50. The touch panel controller 70 detects and outputs the system 80, and a system 80 for executing a corresponding command in response to the coordinate values from the touch panel controller 70.

The touch panel 50 includes an upper film 52 on which first transparent conductive layers 54 are formed, and a lower film 56 on which second transparent conductive layers 58 are formed, respectively. The upper film 52 and the lower film 56 are bonded at a predetermined interval apart.

The upper film 52 and the lower film 56 are bonded by an adhesive 62 at an outer portion of the non-touch area and spaced apart by the height of the adhesive 62. In addition, a plurality of dot spacers 60 may be formed on the first transparent conductive layer 54 or the lower film 56 of the upper film 52 to separate the upper film 52 and the lower film 56 from the touch area. It is further formed on the second transparent conductive layer 58.

As the upper film 52 pressed by a pen or a finger, a transparent film such as polyethylene terephthalate (PET) is mainly used, and the lower film 56 is a transparent film of the same material as the upper film 52 or a glass substrate. Or a plastic substrate is used. Indium-tin-oxide (ITO), indium-zinc-oxide (IZO), or indium-tin-zinc-oxide (ITZO) may be used as the first and second transparent conductive layers 54 and 58. do.

The touch panel 50 may include an X-electrode bar 55 connected to both sides of the first transparent conductive layer 54 to apply a voltage to the first transparent conductive layer 54 in the X-axis direction. The second transparent conductive layer 58 further includes a Y-electrode bar 59 connected to both sides of the second transparent conductive layer 58 to apply a voltage in the Y-axis direction. The X-electrode bar 55 includes a first X-electrode bar 55a and a ground voltage GND for supplying a driving voltage Vcc so that current flows in the X-axis direction to the first transparent conductive layer 54. It consists of a second X-electrode bar (55b) for supplying. The Y-electrode bar 59 includes a first Y-electrode bar 59a and a ground voltage GND for supplying a driving voltage Vcc so that current flows in the Y-axis direction to the second transparent conductive layer 56. It consists of a second Y-electrode bar (59b) for supplying.

The touch panel 50 has a sheet resistance of the transparent conductive layer according to the contact position when a pen or a finger presses the upper film 52 to make the first transparent conductive layer 54 contact the second transparent conductive layer 58. Because of this difference, the resistance value is variable. In addition, since the current or voltage is changed according to the variable resistance value, the second Y-electrode bar 59b is applied to the changing current or voltage when the voltage is applied to the first transparent conductive layer 54. The X-axis coordinate signal is output through the X-axis coordinate signal, and the Y-axis coordinate signal is output through the second X-electrode bar 55b when a voltage is applied to the second transparent conductive layer 58. In this case, the touch panel 50 sequentially outputs the X-axis coordinate signal and the Y-axis coordinate signal under the control of the touch panel controller 70.

In detail, when the driving voltage Vcc and the ground voltage GND are supplied to the X-electrode bar 55 through the first and second switches 64 and 66, the first and second touch panels 50 may be used. The X-axis coordinate signal is output through the second Y-electrode bar 59b in response to a resistance variable by the point where the transparent conductive layers 54 and 58 are in contact. Subsequently, when the driving voltage Vcc and the ground voltage GND are supplied to the Y-electrode bar 59 through the first and second switches 64 and 66, the touch panel 50 is provided with the first and second transparent conductive materials. The Y-axis coordinate signal is output through the second X-electrode bar 55b in response to the resistance variable by the point where the layers 54 and 58 contact.

Here, the first switch 64 may drive the driving voltage Vcc in response to the control signal CS from the touch panel controller 70. The first X-electrode bar 55a or the first Y-electrode bar 59a may be used. To be supplied. The second switch 66 supplies the base voltage GND to the second X-electrode bar 55b or the second Y-electrode bar 59b in response to the control signal CS from the touch panel controller 70. Or output voltage.

The touch panel controller 70 detects the coordinate values according to the X-axis and Y-axis coordinate signals of the touch points supplied from the touch panel 50 and supplies them to the system 80. The touch panel controller 70 controls the first and second switches 64 and 66 to control the supply of power (Vcc, GND) to the touch panel 50.

To this end, the touch panel controller 70 includes an analog-to-digital converter (hereinafter referred to as an ADC) 72 and an ADC 72 for converting X-axis and Y-axis coordinate signals from the touch panel 50 to digital data. The microcomputer 74 detects and outputs coordinate values to the system 80 by the combination of the X-axis and Y-axis coordinate data from the control unit, and an interface unit for relaying the coordinate values from the microcomputer 74 to the system 80. 76 is provided.

The ADC 72 converts each of the X-axis coordinate signal and the Y-axis coordinate signal sequentially supplied from the touch panel 50 into digital data and outputs the digital data.

The microcomputer 74 generates the control signal CS in a predetermined time unit so that the first switch 64 transmits the driving voltage Vcc to the first X-electrode bar 55a or the first Y-electrode bar 59a. The second switch 66 causes the base voltage GND to be supplied to the second X-electrode bar 55b or the second Y-electrode bar 59b. Accordingly, the microcomputer 74 detects the coordinate value of the touch point of the touch panel 50 by combining the X-axis and Y-axis coordinate data sequentially supplied from the ADC 72, and converts the detected coordinate value into the interface unit 76. To the system 80).

FIG. 6 is a schematic plan view showing a linearity measuring device used in the linearity measuring method of the touch panel of the present invention, and FIG. 7 is a perspective view of FIG. 6.

6 and 7, the linearity measuring apparatus of the present invention for the linearity measuring method of the present invention, the first and second linearity measuring pens 81 and 82 and the first and second linearity measuring which are spaced apart from each other by a predetermined distance. A pen connecting bar 83 capable of fixing the first and second linearity measuring pens 81 and 82 so that the pens 81 and 82 are equally spaced along the lines L1 and L2; And a jig (JIG) 90 in which the pen connecting bar moving line 84 capable of moving the pen connecting bar 83 and the touch panel 50 in which linearity measurement is made are located.

And a voltage line detected when the first and second linearity measuring pens 81 and 82 are touched on a line while maintaining the same distance on the touch panel, and the first and second linearity measuring pens. A control means for determining the linearity validity of the touch panel by the difference of the center reference voltage line of the device may be further provided in the controller 70 of the touch panel by software or separately to determine the linearity validity outside the touch panel. Control means to measure linearity.

In the linearity measuring method of the touch panel of the present invention using the linearity measuring equipment of the present invention, the first and second linearity measuring pens 81 and 82 are adjacent to the first and second Y-electrode bars 59a and 59b, respectively. By placing 5V and 0V on the first and second Y-electrode bars 59a and 59b, respectively, and the reference points corresponding to the intermediate points of the first and second Y-electrode bars 59a and 59b. The voltage line Lref is detected. Subsequently, the first and second linearity measuring pens 81 and 82 are touched at the same distance from one end to the other end of the touch panel while drawing a line, and the touch of the first and second linearity measuring pens 81 and 82 is drawn. It is made to observe the voltage value of the detection line (Vref) is measured. In addition, the difference between the measured detection line Vref and the reference voltage line Lref is observed to determine whether it is in a valid range to determine whether linearity NG exists.

At this time, since the first and second linearity measuring pens 81 and 82 are drawn in the first and second lines L1 and L2, the observed voltage value is the voltage value of the first line L1. Vy1 and the intermediate voltage value of the voltage value Vy2 of the second line L2 are output. In FIG. 6, the position on the Y axis corresponding to the voltage value Vy1 of the first line L1 and the intermediate voltage value of the second line L2 is indicated by a thick line Vref.

In fact, the physical 1/2 line between the first line L1 and the second line L2 may be represented by Lref, but the transparent conductive layer passes through the first line L1 and the second line L2. Some linearity distortion occurs due to cracks, etc., and half of each voltage (Vy1, Vy2) value of the two lines (L1, L2) is a thick line (Vref) at a portion having a slight difference from the Lref line. It is displayed.

Here, the portions marked LE1 and LE2 are Y's corresponding to the thick line (Vref, middle voltage value), which is an effective range in which the intermediate voltage value of the first line L1 and the second line L2 can be detected. Axis position), it is determined that the linearity distortion has exceeded the effective range, and the touch panel under such a condition is judged to be an NG product.

As described above, the touch panel for which the linearity measuring method of the present invention is performed is a finished product in which upper and lower films are bonded through an adhesive, and a portion that is actually a target of detection becomes an edge portion of the upper film. This is because cracks in the transparent conductive layer on the upper and lower films, which cause linearity distortion, are severe on the upper film side, and cracks are more likely to occur at the edge portion of the outer edge than in the center area of the touch panel, so that the linearity is determined by designating the edge line of the upper film. It was to measure.

The first line L1 and the second line L2 are spaced apart from each other by about 3 to 5 mm compared with the first and second Y-electrode bars 59a and 59b.

In the above description, detection is performed on edge lines adjacent to the first and second Y-electrode bars 59a and 59b, but in the same manner, edge lines adjacent to the first and second X-electrode bars 55a and 55b are detected. It is also possible to measure linearity by assigning a detection line to.

Meanwhile, the FPC 65 is connected from a power supply voltage or a ground voltage to apply a voltage to the first and second X-electrode bars 55a and 55b and the first and second Y-electrode bars 59a and 59b. The line is printed.

The linearity measuring method of the present invention enables not only the linear inspection of the edge portion of the upper film, but also the open inspection of the FPC 65. This abnormality is indicated by the thick line represented by the intermediate voltage of the two lines L1 and L2 in FIG. 6 so as to cross the LE1 and LE2 lines.

8 is a conceptual view of the linearity measuring method of the touch panel according to the present invention seen in terms of voltage.

As shown in FIG. 8, the method for measuring linearity of the touch panel according to the present invention is described in terms of voltage application. The first and second X-electrode bars 55a and 55b and the first and second Y-electrode bars 59a and FIG. 59b) is connected to the touch panel controller 70 through the FPC 65 to be controlled by the voltage application, and the touch panel controller 70 is connected to the system 80 to output the calculated coordinate values. The position corresponding to the calculated coordinate value is displayed and displayed on the inspection screen 100.

The first and second Y-electrode bars 59a and 59b of the first line L1 and the second line L2 are respectively spaced apart at equal intervals, and the first and second Y-electrode bars 59a, When 5V and 0V are respectively applied to 59b), an intermediate point of the first and second Y-electrode bars 59a and 59b becomes an ideal 2.5V reference voltage (Vyr) line, and two lines actually observed. The effective range of the intermediate voltage value of becomes 37.5 mV (= 2.5 V x 1.5%), which is 1.5% of the reference voltage Vyr, and thus ± 18.75 mV (37.5 mV x up and down on the reference voltage Vyr line). 1/2) of effective voltage lines Vyr +, Vyr−.

As described above, in the method of measuring linearity of the touch panel of the present invention using the line inspection method, the effective voltage lines Vyr + and Vyr- have a conventional 1/2 value at ± 0.75% of the reference voltage Vyr. This is because the intermediate value of the voltage values measured at the lines L1 and L2 is observed at the detection line Vref, so that the effective range at one measurement point has been multiplied by a half value.

The determination of the linearity effective range is programmed in the touch panel controller 70 to be controlled by the touch panel controller 70.

9 is a simulation diagram when the linearity measuring method of the touch panel of the present invention is applied.

When applying the linearity measurement method of the touch panel of the present invention, when the linearity distortion occurs on one side at the bottom, as shown in Figure 9, the voltage value is normally detected at the middle point on the other side, the detection line ( It can be seen that Vref) is observed over the effective voltage lines Vyr + and Vyr-. This case is determined as linearity NG and is omitted in the process.

In the linearity measurement method described above, 5V and 0V are applied to the upper and lower Y-electrode bars, respectively, and voltage detection lines for the first and second lines spaced apart from each other by the same interval are respectively applied to the upper and lower Y-electrode bars. Compared to the reference voltage line, which is an intermediate line, the same principle can be applied to the left and right X-electrode bars by touching lines spaced apart from each other.

In addition, instead of (5V, 0V), the first voltage and the second voltage applied to the X-electrode bar or the Y-electrode bar are applied with (3.3V, 0V), respectively, and the intermediate value (1.65V) is used as a reference voltage value. The measurement may be performed by setting a value within a range of ± 0.75% of the reference voltage value as an effective range.

On the other hand, the present invention is not limited to the above embodiments, but those skilled in the art to which the present invention pertains can be modified within the scope of the technical idea of the present invention.

The linearity measuring equipment and the linearity measuring method using the same of the touch panel of the present invention as described above have the following effects.

First, compared to a method of measuring voltage values at a plurality of portions at a predetermined interval, linearity can be detected on an edge line adjacent to an electrode bar to detect distortions occurring between measurement points.

Second, even if the area for checking the linearity is limited to the edge portion adjacent to the electrode bar of the upper film, the linearization distortion may be limited to the portion where the linearity distortion is a problem, thereby minimizing the inspection time.

Third, the FPC open inspection is possible by detecting the voltage on the line from one side to the other side.

1 is an exploded perspective view showing a conventional touch panel and a block diagram showing a power supply control unit of the touch panel;

2 illustrates a method of detecting a position of a touch panel.

FIG. 3 is a diagram illustrating a linearity distortion shown locally when a touch panel is inspected by a method for checking a linearity of a conventional touch panel.

4 is a graph illustrating a range in which linearity distortion is possible and a conventional linearity measuring method.

5 is an exploded perspective view showing a touch panel of the present invention and a block diagram showing a power supply control unit of the touch panel;

6 is a schematic plan view showing a linearity measuring device used in the linearity measuring method of the touch panel of the present invention.

7 is a perspective view of FIG. 6

8 is a conceptual view of the linearity measuring method of the touch panel according to the present invention seen in terms of voltage

9 is a simulation diagram when the linearity measuring method of the touch panel of the present invention is applied.

* Explanation of symbols on the main parts of the drawings

50: touch panel 52: upper film

54: first transparent conductive film 55: X-electrode bar

55a: first X-electrode bar 55b: second X-electrode bar

56: lower substrate 58: second transparent conductive film

59: Y-electrode bar 59a: First Y-electrode bar

59b: second Y-electrode bar 60: dot spacer

64, 66: switch 65: FPC

70: touch panel controller 72: analog-to-digital converter (ADC)

74: microcomputer 76: interface unit

80 system 81 first linearity measuring pen

82: second linearity measurement pen 83: pen connection bar

84: bar movement line for pen connection 90: jig

100: display device

Claims (16)

First and second linearity measuring pens spaced apart from each other by a predetermined distance; A pen connection bar capable of fixing the first and second linearity measuring pens such that the first and second linearity measuring pens maintain the same distance from the X-electrode bars or the Y-electrode bars of the touch panel; A pen connecting bar moving line capable of moving the pen connecting bar; And Equipment for measuring linearity of the touch panel, characterized in that it comprises a jig (JIG) in which the touch panel in which the linearity measurement is made. The method of claim 1, The difference between the voltage line detected when the first and second linearity measuring pens are touched on the touch panel while maintaining the same distance, and the center reference voltage lines of the first and second linearity measuring pens. And a control means for determining an effective degree of linearity of the touch panel. Applying a first voltage and a second voltage to the left and right X-electrode bars of the touch panel, respectively; Detecting a reference voltage line corresponding to an intermediate value of the first voltage and the second voltage; Simultaneously touching the first and second lines spaced apart at equal intervals from the left and right X-electrode bars; And And comparing the detection line corresponding to the intermediate voltage value between the first line and the second line with the reference voltage line to determine linearity. The method of claim 3, wherein And the touch of the first line and the second line is maintained at the same distance from the reference voltage line. The method of claim 3, wherein And determining the linearity by determining the distance from the detection line to the reference voltage line. The method of claim 5, And determining linearity NG when the distance from the detection line to the reference voltage line exceeds an effective range. The method of claim 6, The effective range is a linearity measurement method of the touch panel, characterized in that within ± 0.75% of the reference voltage. The method of claim 3, wherein The linearity measurement method of the touch panel, characterized in that the determination of the linearity is made in the controller of the touch panel. The method of claim 3, wherein The first line and the second line is a linearity measurement method of the touch panel, characterized in that spaced 3 to 5mm apart from the left and right X-electrode bars, respectively. Applying a first voltage and a second voltage to upper and lower Y-electrode bars of the touch panel, respectively; Detecting a reference voltage line corresponding to an intermediate value of the first voltage and the second voltage; Simultaneously touching the first and second lines spaced apart at equal intervals from the upper and lower Y-electrode bars; And And comparing the detection line corresponding to the intermediate voltage value between the first line and the second line with the reference voltage line to determine linearity. The method of claim 10, And the touch of the first line and the second line is maintained at the same distance from the reference voltage line. The method of claim 10, And determining the linearity by determining the distance from the detection line to the reference voltage line. The method of claim 12, And determining linearity NG when the distance from the detection line to the reference voltage line exceeds an effective range. The method of claim 13, The effective range is a linearity measurement method of the touch panel, characterized in that within ± 0.75% of the reference voltage. The method of claim 10, The linearity measurement method of the touch panel, characterized in that the determination of the linearity is made in the controller of the touch panel. The method of claim 10, The first line and the second line is a linearity measurement method of the touch panel, characterized in that spaced from 3 to 5mm apart from the upper and lower Y-electrode bars, respectively.