KR101027672B1 - Tablet for detecting both finger and pointer - Google Patents

Abstract

PURPOSE: A tablet is provided to sense a touch of the finger in a sensing area for sensing a location of the pointer by providing an antenna substrate structure. CONSTITUTION: A first comparator(41) outputs a voltage difference with an induction power. The induced power is generated by enabling a point to access a first line antennas(11a~11d). A pointer detector(50) outputs a first pointer coordinate by detecting a location of the pointer based on the voltage difference. A touch sensor(60) outputs a first touch coordinate by determining access of a finger based on electrostatic capacity sensed from another end of a first line electrodes(21).

Description

Tablet for detecting the position of a finger and a pointer with a resonant circuit at the same time {TABLET FOR DETECTING BOTH FINGER AND POINTER}

The present invention relates to a tablet capable of simultaneously detecting the position of a finger having a finger and a resonant circuit, and more particularly, a touch capable of detecting a touch of a finger and simultaneously detecting a position of the pointer having a resonant circuit. It relates to a tablet having a pad function.

A coordinate input device comprising a pointer that incorporates a resonant circuit to generate an electromagnetic induction phenomenon and a tablet that senses the position of the pointer by the electromagnetic induction phenomenon and inputs a user's manipulation to a computer, etc. It is in the spotlight as a man-machine interface.

As such a coordinate input device, a pointer and a tablet as disclosed in Korean Patent No. 10-910348 are known.

In the above patent, a plurality of loop antennas for exciting electromagnetic waves with respect to a pointer having a resonant circuit and a plurality of positions for detecting the positions of electromagnetic waves generated by the resonant circuit in reverse from a pointer energized by the electromagnetic waves excited from the loop antenna are used. A technique using a line antenna of is disclosed.

However, in such a conventional tablet, only the position of a pointer having a resonant circuit can be detected. Therefore, when using a tablet, a predetermined pointer must be used. In addition, among the various demands of users, there is also a demand for a pointing by the touch of a finger to the coordinate sensing surface of the tablet.

Accordingly, there is a need for a coordinate input device capable of accurately pointing a finger and recognizing a touch by a finger while using a tablet by a pointer.

An object of the present invention is to provide a tablet capable of simultaneously detecting a touch of a user's finger in the sensing area for detecting the position of the pointer.

Another object of the present invention is to provide a thinner antenna substrate structure capable of simultaneously detecting a pointer and a finger.

The present invention for achieving the above object is a plurality of first line antennas arranged in parallel in a first direction within a predetermined sensing area and one end side is connected in common to each other, and each other end side of the first line antenna and Select at least three other ends of the other ends, and two other ends of the selected other ends are connected in common to form a loop, and one of the other ends is the first output, and the other of the selected other ends A voltage generated between the first output and the second output by a first selector having a second inner end as a second output and induced power generated by a pointer emitting electromagnetic force approaching the first line antenna; A first comparator that compares and outputs a voltage difference, and detects a position of the pointer with respect to the formed loop by using the output voltage difference. A pointer detector for outputting inter-coordinates, the first line antenna being formed on the same plane and arranged in parallel with each other in an insulated state from the first line antenna in a space between the first line antennas arranged in parallel with each other; A second selector connected to a plurality of first line electrodes, each end of which is insulated from each other, and the other end of each of the first line electrodes to select one of the first line electrodes; A touch detector configured to determine whether a finger approaches the first line electrode corresponding to the selected other end by using the capacitance sensed from the selected other end, and output a first touch coordinate; and the first detector from the pointer detector And a position detection controller configured to receive and hold the pointer coordinates and the first touch coordinates from the touch detector. Provides a tablet having a touch pad function.

The first selector may be connected to a second output of at least two outermost ends of each of the other end of the first line antenna and connected to each other so as to form a loop, and fixed to the first output. One of the other ends of the inner side except for the other end is sequentially selected to be the second output.

In addition, a plurality of second line antennas disposed in parallel in a second direction perpendicular to the first direction and connected at one end in common with each other, and connected to the other end side of each of the second line antennas, at least one of the other ends Three other ends are selected, and two other ends of the selected other ends are connected in common to form a loop, one of which is the third output, and one of the other ends is selected. Comparing a voltage generated between the third input and the fourth input by a third selector having four outputs and induced power generated by a pointer emitting electromagnetic force approaching the second line antenna to output a voltage difference. Within the second line in a space between a second comparator and the second line antenna coplanar with the second line antenna and arranged parallel to each other. A plurality of second line electrodes disposed in parallel with each other in an insulated state from each other, and one end of each of which is insulated from each other, and the other end side of each of the second line electrodes, And a fourth selector for selecting the other end, wherein the pointer detector uses the voltage difference output from the second comparator to determine a position of the pointer with respect to the three second line antennas selected by the third selector. Detects and outputs second pointer coordinates, and the touch detector detects a finger on the second line electrode corresponding to the selected other end by using the capacitance sensed by the second line electrode selected by the fourth selector. It is characterized in that it is determined whether or not the approach is to output the second touch coordinates.

In addition, a plurality of third line electrodes disposed in parallel with each other in a third direction crossing the first direction and the second direction, and each end is insulated from each other, and each other of the third line electrodes. A fifth selector connected to a short side and configured to detect an electrostatic capacity by a finger approach by selecting the other end of the third line electrode, and wherein the touch detector is configured to select the fifth selector from the fifth selector The third touch coordinates of the finger are output using the capacitance sensed from one of the three line electrodes, and the position detection control unit measures the accuracy of the first touch coordinates and the second touch coordinates by the third touch coordinates. Verify.

In addition, a loop coil disposed to surround the outside of the sensing area and outputting an electromagnetic force is formed.

According to the present invention made as described above, it is possible to realize a tablet that can simultaneously sense the touch of the user's finger in the detection area for detecting the position of the pointer.

In addition, the antenna substrate of the tablet according to the present invention, in the case where each electrode, antenna, and substrate as a transparent electrode and a transparent substrate, the number of substrates can be minimized, so that the transparency is improved and applied to the surface of the display device It is also possible.

EMBODIMENT OF THE INVENTION Hereinafter, with reference to an accompanying drawing, this invention is demonstrated in detail about the tablet which can simultaneously detect the coordinate of the pointer provided with the resonant circuit, and the coordinate of the approaching finger. In the following description, for the configuration and operation for detecting the position of the pointer, refer to the configuration of Patent No. 10-910348.

A tablet with a touch pad function according to an embodiment of the present invention will be described with reference to FIGS. 1 to 15.

In the tablet having a touch pad function according to an embodiment of the present invention, a line antenna for detecting a coordinate of a pointer and a line electrode for detecting a touch position of a finger are simultaneously formed on one substrate and individually driven by This is done by detecting the position of the pointer and finger.

1 is a view schematically showing the overall configuration of a tablet with a touch pad function according to an embodiment of the present invention. Referring to the drawings, the tablet with a touch pad function according to an embodiment of the present invention, the first line antenna 11, the first selector 31, the first comparator 41, the pointer detector ( 50, a first line electrode 21, a second selector 32, a touch detector 60, and a position detection controller 70.

Here, the first line antenna 11, the first selector 31, the first comparator 41, and the pointer detector 50 detect the pointer P approaching the sensing area A to calculate coordinates. The first line electrode 21, the second selector 32, and the touch detector 60 are configured to detect the position of the finger H approaching the sensing area A. FIG.

In the description with reference to FIG. 1, they are arranged in one direction (horizontal direction with respect to the ground, that is, the X-axis direction) and are arranged side by side along the second direction (vertical direction with respect to the ground, that is, the Y-axis direction). The configuration for detecting the position of the pointer and the finger with respect to the coordinate axis along the second direction by the plurality of first line antennas and the first line electrodes described above will be described first. Meanwhile, in order to detect a position having another first direction as a coordinate axis, a plurality of second line antennas and second line electrodes arranged side by side along the second direction and a configuration for driving the same are required.

The first line antenna 11 extends in the first direction and points to straight line electrode patterns arranged in parallel in the second direction. At this time, one end side of the first line antennas 11 (the left end portion of the first line antenna in FIG. 1) is commonly connected and electrically connected, and the other end side of the first line antennas 11 (the first end in FIG. 1). The right end of the one-line antenna) is connected to the first selector 31, which will be described later, to form a comb teeth.

The first line antenna 11 may be formed through pattern printing on a substrate for forming the sensing region A, but is preferably formed on the transparent substrate by ITO or the like.

At this time, the energy of the electromagnetic force is supplied to the resonant circuit of the pointer P to the outer portion of the edge of the sensing area A, which is the area where the first line antenna 11 is disposed, and the resonant circuit of the pointer P is provided. Loop coil 19 for detecting a change in the electromagnetic force output from the is formed. Of course, if the pointer P itself has an energy source such as a battery and can emit electromagnetic force, a configuration such as the loop coil 19 may be unnecessary.

The first selector 31 may select three other ends of the other ends of the plurality of first line antennas 11 under the control of the position detection control unit 70 to be described later. The two outermost ends of the selected other ends are connected in common to each other to become a first input, which is an input of the first comparator 41, and the other end of the other end is another input of the first comparator. It becomes a 2nd input.

In such a configuration, in Fig. 1, the first line antenna 11 is first connected to 11a-11c in common and is selected as the first input, and 11b is selected as the second input to detect the position of the pointer P, Next, the position of the pointer P can be detected by connecting 11b-11d in common and making it the first input and selecting 11c as the second input.

Meanwhile, the first selector 31 selects two line antennas 11a and 11d disposed at the outermost sides of both of the plurality of first line antennas 11 in advance, connects them in common, and fixes them as a first input ( 5 and 6), the second input may be set by sequentially selecting one of the remaining first line antennas 11b and 11c.

The three line antennas selected in this way have a shape in which a straight line crosses a loop of a rectangular shape. At this time, the closed rectangle forms two virtual loops by crossing conductors.

The first selector 31 which performs such an operation may be composed of a relay or an analog switch array turned on / off by a control signal input to the outside, and a multiplexer which selects one or a plurality of inputs from among a plurality of inputs and outputs them. It may also be made by.

The first comparator 41 calculates a difference between voltages generated between the first input and the second input by induced power generated by the pointer P emitting electromagnetic force approaching the first line antenna 11. The output is provided as a comparison value and provided to the pointer detection unit 50. The comparison value has magnitude by positive / negative sign and difference.

The pointer detector 50 detects the position of the pointer P based on the inner region of the loop formed by the first line antenna 11 using the comparison value output from the first comparator 41. The detected position is output as the first pointer coordinates.

That is, when the pointer P approaches the formed loop shape, induced power is generated along two virtual loops formed by the first line antenna traversing the inner loop, and the inner traversing inner loop. Depending on the case where the pointer P is located on the left side of the first line antenna and the case on the right side, and also according to the distance of the pointer from the first intersecting first line antenna, the first comparator 41 is outputted. The positive / negative and voltage magnitudes of the comparison values will change.

The coordinates (first pointer coordinates) of the pointer P having the second direction as the coordinate axis may be calculated using the comparison value.

The first line electrodes 21 extend in the first direction (X-axis direction) and are a plurality of linear electrode patterns arranged in parallel in a second direction (Y-axis direction). The plurality of first line electrodes 21 are formed insulated from each other. One end side of the first line electrode 21 (for example, the right end in the drawing) is in a state without any electrical connection, and the other end side (the left end in the drawing) is the second selector ( 32 is arbitrarily selected by the second selector 32 to be electrically connected to the touch detector.

The second selector 32 selects any one of the other ends of the plurality of connected first line electrodes 21 under the control of the position detection control unit 70, and selects any one selected first line electrode 21. Outputs a voltage (or current) due to a change in capacitance input from The output of the second selector 32 is connected to the touch detector 60.

The second selector 32 performs a scan to sequentially select all of the plurality of first line electrodes 21 one by one.

The touch detection unit 60 detects any one of the line electrodes in which the change in capacitance is greatest by the scan performed by the second selector 32, and the position where the finger H touches the position of the line electrode. Determined to set to the first touch coordinates.

The position detection control unit 70 performs a selection operation of the first selector 31 for the plurality of first line antennas 11 and a selection operation of the second selector 32 for the plurality of first line electrodes 21. To control. In addition, the first pointer coordinates and the first touch coordinates calculated by the pointer detector 50 and the touch detector 60 are received and stored in a predetermined memory, or transmitted to a connected computer (not shown).

On the other hand, the first line antenna 11 and the first line electrode 21 described above may be formed on each substrate separately, but preferably formed on one substrate at the same time. In this case, the first line electrodes 21 are widely formed in a space between each adjacent first line electrode 21 on the substrate on which the first line antenna 11 is formed (see FIG. 5 or 6). . According to this configuration, the plurality of first line antennas 11 for detecting the position of the pointer P and the plurality of first line electrodes 21 for detecting the position of the finger H on one substrate are provided. Since it can be formed at the same time, it is possible to minimize the number of substrates for configuring the antenna for detecting the position of the pointer (P) and the finger (H).

On the other hand, when the first line antenna 11 and the first line electrode 21 as described above are used, only coordinates having the first direction as the coordinate axis can be detected. Thus, by arranging the second line antenna 12 and the second line electrode 22 in another second direction that intersects (preferably orthogonal) with the first direction, the coordinates of the pointer P and the finger ( The touch position of H) can be detected with respect to the Cartesian coordinate system.

To this end, a third selector 33 for selecting one or three ends of the plurality of second line antennas 12 and a second comparator 42 for outputting a voltage difference due to the induced voltage are further provided. A fourth selector 34 is further provided for selecting any one of the plurality of second line electrodes 22.

The operation of the third selector 33 and the fourth selector 34 is controlled by the position detection control section.

FIG. 2 is a diagram illustrating an arrangement form of a first line electrode in a tablet having a touch pad function according to an exemplary embodiment of the present invention. According to the figure, there is shown a first line electrode 21 extending along the first direction and arranged in parallel, with the second selector 32 electrically at the other end of each of the first line electrodes 21. It is connected. The finger H approaches the first line electrode 21.

3 is a diagram illustrating an arrangement form of a second line electrode according to an exemplary embodiment. Here, the second line electrodes 22 and the fourth selector 34 extending in the second direction and parallel to each other are shown.

4 is a diagram illustrating a state where the first line electrode and the second line electrode are disposed to overlap each other. At this time, each of the first line electrode 21 and each of the second line electrode 22 is insulated from each other. That is, the first line electrode 21 and the second line electrode 22 are formed on separate substrates, or are formed on both surfaces with respect to one substrate, respectively.

FIG. 5 is a diagram illustrating a form in which a first line antenna and a first line electrode are disposed on the same plane of a substrate in a tablet having a touch pad function according to an embodiment of the present invention. As shown, the first line antennas 11 and the first line electrodes 21 are preferably arranged side by side on each other on the same plane of the substrate. That is, the first line electrode 21 is disposed in the space between each of the first line antennas 11 arranged in parallel with each other.

With this arrangement, since the line antenna and the line electrode can be simultaneously formed on one surface of one substrate by patterning or the like, the manufacturing process for forming the antenna (the line antenna and the line electrode) is facilitated and the manufacturing cost can be reduced. As a result, the number of substrates required to form the antenna can be reduced. In this case, the line electrodes are preferably formed to have as large an area as possible in the space, in order to be able to respond to the change in capacitance caused by the finger H as much as possible.

FIG. 6 is a diagram illustrating an arrangement form of a second line antenna and a second line electrode in a tablet having a touch pad function according to an embodiment of the present invention. The details are the same as the description in FIG.

Here, the substrate on which the first line antenna 11 and the first line electrode 21 are arranged, and the second line antenna 12 and the second line electrode 22 shown in FIG. If the arranged substrates are superimposed, it is possible to accurately detect the pointer coordinates and the touch coordinates for the Cartesian coordinate system whose first and second directions are the respective coordinate axes.

FIG. 7 is a diagram for describing a principle of detecting a touch position of a finger in a sensing area in which a first line electrode and a second line electrode are disposed. In the drawing, a state in which the finger H touches the touch position T while the first line electrode 21 and the second line electrode 22 are disposed to perpendicularly cross each other, and outputs from each line electrode. Displays the change in capacitance.

That is, when the finger H touches the touch position T, it is possible to confirm that the capacitance changes significantly at the line electrodes disposed at the T1 and T2 positions, respectively. This makes it possible to determine the point where each position intersects (intersects when each line electrode extends in the extending direction) as the touch position T. FIG.

FIG. 8 is a diagram for describing a principle of detecting respective touch positions when a plurality of touches are generated in the sensing region in which the first line electrode and the second line electrode are disposed.

When a finger touches two touch positions Ta and Tb in the sensing area A, the shape of the capacitance sensed by the first line antenna 11 is represented by a pattern showing a large value at points T1a and T1b. The pattern of the capacitance sensed by the second line antenna 12 is shown to have a large value at the T2a and T2b points. If each touch position is calculated using the intersection of the patterns, it is determined that the touch has occurred not only at the Ta and Tb positions but also at the Tfa and Tfb points. Therefore, there is a need for a procedure for verifying these incorrectly determined touch positions Tfa and Tfb.

FIG. 9 is a view illustrating a form in which a third line electrode disposed in another third direction as well as the first direction and the second direction, is applied to verify a touch position that is incorrectly determined as in FIG. 8. According to FIG. 9, a third line electrode 23 arranged in a diagonal direction is applied to the first line electrode 21 in the first direction perpendicular to each other and the second line electrode 22 in the second direction. You can check.

The third line electrodes 23 in the third direction can detect a change in capacitance at the T3a and T3b positions, and verify the actual touch positions Ta and Tb. In other words, the touch positions Tfa and Tfb which are erroneously determined can be erased.

FIG. 10 is a diagram showing a configuration that enables more accurate detection of a touch position by arranging fourth line electrodes 24 arranged in another fourth direction perpendicular to the third direction.

On the other hand, according to such an arrangement, since the first to fourth line electrodes must be overlapped, a pattern of line electrodes arranged in four directions as shown in FIG. 11 is required. That is, FIG. 11 shows a state of each substrate on which line electrodes arranged in four directions are formed.

12 is a diagram illustrating first line antennas and first line electrodes disposed on a substrate surface. According to the drawing, it can be seen that the first line electrode 21 is arranged in such a manner as to occupy the largest area in the space between the first line antennas 11 arranged side by side.

FIG. 13 illustrates a structure in which second line antennas and second line electrodes are disposed on a surface of a substrate.

FIG. 14 is a diagram illustrating a form in which a substrate on which a first line antenna and a first line electrode are formed, and a substrate on which a second line antenna and a second line electrode are formed are overlapped.

FIG. 15 illustrates a substrate in which a first line antenna and a first line electrode are formed and a substrate on which a second line antenna and a second line electrode are overlapped are arranged in a tablet with a touch pad function according to an embodiment of the present invention. It is a cross-sectional view of the form.

First, a protective substrate SB is disposed at a base portion, a substrate S11 having a first line antenna and a first line electrode arranged in a first direction, a PET substrate SP for insulation, and arranged in a second direction. The substrate S12 having the second line antenna and the second line electrode formed thereon, the PET substrate SP for insulation, the substrate S23 having the third line electrode arranged in the third direction, and the PET substrate SP for insulation ), The substrate S24 on which the fourth line electrodes are arranged in the fourth direction, and the hard coating substrate ST for protection from the touch and the pointer are overlapped. Here, the arrangement order of the substrates on which each electrode is formed may be arbitrarily set.

1 is a view schematically showing the overall configuration of a tablet with a touch pad function according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating an arrangement form of a first line electrode in a tablet having a touch pad function according to an exemplary embodiment of the present invention.

3 is a diagram illustrating an arrangement form of a second line electrode according to an exemplary embodiment.

4 is a diagram illustrating a state where the first line electrode and the second line electrode are disposed to overlap each other.

FIG. 5 is a diagram illustrating a form in which a first line antenna and a first line electrode are disposed on the same plane of a substrate in a tablet having a touch pad function according to an embodiment of the present invention.

FIG. 6 is a diagram illustrating an arrangement form of a second line antenna and a second line electrode in a tablet having a touch pad function according to an embodiment of the present invention.

FIG. 7 is a diagram for describing a principle of detecting a touch position of a finger in a sensing area in which a first line electrode and a second line electrode are disposed.

FIG. 8 is a diagram for describing a principle of detecting respective touch positions when a plurality of touches are generated in the sensing region in which the first line electrode and the second line electrode are disposed.

FIG. 9 is a view illustrating a form in which a third line electrode disposed in another third direction as well as the first direction and the second direction, is applied to verify a touch position that is incorrectly determined as in FIG. 8.

FIG. 10 is a diagram showing a configuration that enables more accurate detection of a touch position by disposing fourth line electrodes arranged in another fourth direction perpendicular to the third direction.

FIG. 11 is a diagram illustrating a state of each substrate on which line electrodes arranged in four directions are formed.

12 is a diagram illustrating first line antennas and first line electrodes disposed on a substrate surface.

FIG. 13 illustrates a structure in which second line antennas and second line electrodes are disposed on a surface of a substrate.

FIG. 14 is a diagram illustrating a form in which a substrate on which a first line antenna and a first line electrode are formed, and a substrate on which a second line antenna and a second line electrode are formed are overlapped.

FIG. 15 illustrates a substrate in which a first line antenna and a first line electrode are formed and a substrate on which a second line antenna and a second line electrode are overlapped are arranged in a tablet with a touch pad function according to an embodiment of the present invention. It is a cross-sectional view of the form.

Claims (5)

A plurality of first line antennas arranged in parallel in a first direction in a predetermined sensing area and connected to one end in common with each other; It is connected to the other end side of each of the first line antenna, at least three other end of the other end is selected, and the other two ends of the selected other ends are connected in common to form a loop and one of the other end A first selector configured to be a first output and the other one of the inner ends of the selected other ends as a second output; A first comparator for outputting a voltage difference by comparing a voltage generated between the first output and the second output by an induced power generated by a pointer emitting an electromagnetic force approaching the first line antenna; A pointer detector which detects a position of the pointer with respect to the formed loop by using the output voltage difference and outputs first pointer coordinates; Formed in the same plane as the first line antenna, disposed in parallel with each other in an insulated state from the first line antenna in a space between the first line antennas arranged in parallel with each other, and each end of the first line antenna being insulated from each other. A plurality of first line electrodes, A second selector connected to the other end of each of the first line electrodes to select one other end of the first line electrodes; A touch detector for outputting first touch coordinates by determining whether a finger approaches the first line electrode corresponding to the selected other end by using the capacitance sensed from the selected other end; And a position detection controller configured to receive and hold the first pointer coordinates from the pointer detector and the first touch coordinates from the touch detector. The method of claim 1, The first selector, At least two outermost ends of each other end of each of the first line antennas are selected to be connected in common so as to form a loop, and are fixed to the first output, and the other inner ends of the first line antenna other than the other outermost ends The tablet with a touch pad function, characterized in that to sequentially select one of them to the second output. The method according to claim 1 or 2, A plurality of second line antennas arranged in parallel in a second direction orthogonal to the first direction, and having one end connected in common to each other; It is connected to the other end of each of the second line antenna, at least three other end of the other end is selected, and the other two ends of the selected other ends are connected in common to form a loop and one of the other end A third selector which is a third output, and the other one of the inner ends of the selected other ends is a fourth output; A second comparator configured to output a voltage difference by comparing a voltage generated between the third input and the fourth input by induced power generated by a pointer that emits an electromagnetic force approaching the second line antenna; Formed in the same plane as the second line antenna, disposed parallel to each other in an insulated state from the second line antenna in a space between the second line antennas arranged in parallel with each other, and one end of the second line antenna being insulated from each other; A plurality of second line electrodes, A fourth selector connected to each other end side of the second line electrode to select one other end of the second line electrode, The pointer detector detects the position of the pointer with respect to the three second line antennas selected by the third selector by using the voltage difference output from the second comparator, and outputs second pointer coordinates. The touch detector may determine whether a finger has approached the second line electrode corresponding to the selected other end by using the capacitance sensed by the second line electrode selected by the fourth selector. Tablet with a touch pad function, characterized in that for outputting touch coordinates. The method of claim 3, A plurality of third line electrodes disposed in parallel with each other in a third direction crossing the first direction and the second direction, and each end of which is insulated from each other; A fifth selector connected to the other end of each of the third line electrodes and configured to select one of the third end of the third line electrode to sense capacitance by the approach of a finger; The touch detector outputs the third touch coordinates of the finger by using the capacitance sensed from one of the third line electrodes selected by the fifth selector, And the position detection control unit verifies the accuracy of the first touch coordinates and the second touch coordinates by the third touch coordinates. The method according to claim 1 or 2, A tablet having a touch pad function, the loop coil being disposed to surround the outside of the sensing area and outputting electromagnetic force.

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