KR20130108930A - Tablet with improved line-antena structure - Google Patents
Tablet with improved line-antena structure Download PDFInfo
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- KR20130108930A KR20130108930A KR1020120030781A KR20120030781A KR20130108930A KR 20130108930 A KR20130108930 A KR 20130108930A KR 1020120030781 A KR1020120030781 A KR 1020120030781A KR 20120030781 A KR20120030781 A KR 20120030781A KR 20130108930 A KR20130108930 A KR 20130108930A
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- antenna
- loop antenna
- electronic pen
- antennas
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/1613—Constructional details or arrangements for portable computers
- G06F1/1626—Constructional details or arrangements for portable computers with a single-body enclosure integrating a flat display, e.g. Personal Digital Assistants [PDAs]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
- G06F3/03545—Pens or stylus
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/046—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by electromagnetic means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
Abstract
Description
The present invention provides a tablet having an improved line antenna, and more particularly, a line antenna is input to a line selection circuit at an outer portion of a loop antenna surrounding an electronic pen sensing region capable of determining the position of the electronic pen. The present invention relates to a tablet having an improved structure of a line antenna so as to appropriately distribute or minimize the space occupied.
Recently, a loop antenna of a closed loop shape along the periphery of the sensing area so as to form an electronic pen sensing region, and one end is electrically connected to the loop antenna and the other end is insulated from the loop antenna and crosses the closed loop form. The technology related to a tablet using a plurality of line antennas arranged in parallel to each other and is disclosed in Korean Patent Registration No. 10-910348.
1 is a view schematically showing the configuration of a conventional tablet having a loop antenna and a line antenna. Referring to the drawings, a tablet system consisting of an electronic pen and a tablet can be seen, wherein the electronic pen is configured to emit electromagnetic force using a resonant circuit having at least a capacitor and an inductor. The electronic pen has a built-in resonant circuit configured to store energy induced in a capacitor by resonating by an externally generated electric force, and to output an electromagnetic force by self resonating by induced energy stored in a capacitor when an external electromagnetic force is stopped. Can be. Alternatively, the battery may be provided to itself to be resonant regardless of an external electromagnetic force.
The loop antenna is connected to the ground and has a closed loop shape that forms a circumference of a sensing area formed for sensing the position of the electronic pen on the insulating substrate. In particular, the closed loop shape of the electronic pen sensing region and the loop antenna may be formed in a rectangular shape in the horizontal (X-axis) and vertical (Y-axis) directions.
The line antenna is arranged inside the closed loop of the loop antenna and flows out to the outside. At this time, one end of the line antenna is electrically connected to the loop antenna and the other end is insulated from the loop antenna. It is arranged in a transverse form. In this case, a plurality of line antennas may be preferably arranged in parallel with each other at equal intervals.
At this time, the line antenna has a longitudinally extended X-axis line antenna (first line antenna) and one end connected to one side of the horizontal direction in a rectangular loop antenna and a longitudinal direction in a rectangular shape of the loop antenna. One end is connected to any one side may be composed of a Y-axis line antenna (second line antenna) of the form extending in the horizontal direction. Furthermore, a plurality of X-axis line antennas may be arranged in parallel with each other at equal intervals on the sides in the horizontal direction, and the Y-axis line antennas may be arranged in the same manner.
Although a plurality of X-axis line antennas extend in the longitudinal direction, they are named as X-axis line antennas because they are used to determine the coordinates in the horizontal direction. Similarly, the Y axis line antenna is used to determine the left end in the Y axis direction.
The X-axis line antennas and the Y-axis line antennas are insulated from the loop antenna except that one end is connected to the loop antenna. That is, the points passing through each of the line antennas and the loop antenna in the drawing are insulated from each other. In addition, the line antennas are also insulated from each other at the intersections of the antennas.
The line selection circuit is coupled with the other ends of each of the plurality of line antennas. According to the input selection signal, any one of the other ends of the combined plurality of line antennas is selected and set as an output (differential output).
Since the line antenna is composed of two sets of the X-axis line antenna and the Y-axis line antenna, it is preferable that the line selection circuit also includes a first selection circuit for the X-axis line antenna and a second line selection circuit for the Y-axis line antenna, respectively. Do. Of course, it is also possible to implement to select the line antennas by one line selection circuit.
The coordinate sensing circuit controls the selection operation of the first line selection circuit and the second line selection circuit. In addition, the coordinate sensing circuit may include one or two differential amplifiers and an MCU.
The differential amplifier has one input connected to ground and the other input connected to the differential output of the line antenna selected by the line select circuit. When the induced voltage (the voltage generated by the induced current induced by the line antenna selected by the electromagnetic force of the electronic pen) appears in the differential output, the difference with the ground is output. The MCU determines the position of the electronic pen based on the selected line antenna using the difference (induction voltage) output from the differential amplifier (see FIG. 2 for the principle of position determination).
The power coil is provided to supply inductive energy to the electronic pen when the electronic pen does not have its own battery. The power coil may be mainly configured in the form of a coil wound along the circumference of the electronic pen sensing region.
The coil drive driver applies AC power having a predetermined frequency (frequency equal to or similar to the resonant frequency of the electronic pen) to the power coil.
In FIG. 1, a power source for driving the respective components is not shown, but a commercial AC power source or a rectified DC power source or a battery may be disposed and supplied to each component unit.
Tablets with this configuration work on the following principle: 2 is a view for explaining the principle of operation of a conventional tablet having a loop antenna and a line antenna.
In FIG. 2 (a), a closed loop loop antenna surrounding a rectangular shape serving as a sensing area, one end of which is connected to the lower side of the loop antenna, the other end of which extends upwards of the rectangular shape and crosses the upper side thereof. By passing, it is possible to see a number of line antennas penetrating the rectangular sensing area in the longitudinal direction. (Here and in the following description, the illustration and explanation of the horizontal Y-axis line antenna and its associated components are omitted.)
In such a configuration, if the line selection circuit selects one line antenna, the closed loop of the loop antenna may be divided into a virtual left loop and a right loop by the selected line antenna. At this time, when the electronic pen emitting electromagnetic force approaches the position of the sensing region, the voltage appearing at the differential output is reversed depending on which of the left and right loops the electronic pen is separated by the selected line antenna. Will appear.
FIG. 2 (b) is a waveform diagram showing the magnitude of the induced voltage output from each line antenna when the electronic pen is located as shown in FIG. In FIG. 2 (a), seven line antennas are shown as an example, and in FIG. 2 (b), the magnitudes of the seven sampled induced voltages are shown.
Since the line select circuit cannot select all the line antennas at the same time to sample the induced voltage, the line select circuit selects one line antenna at any period and connects (scans) it as a differential output. Since the electronic pen must be in a relatively stationary position during one scan of all the line antennas, the period of the scan is set at a very high speed relative to the movement of the electronic pen. Usually, the scan period can be set to a few hundred Hz to several MHz, but not limited to this.
In the coordinate sensing circuit, the induced voltage appearing at the selected differential output is sampled and held, and a waveform as shown in FIG. 2B is generated using the held value for each line antenna.
Referring to FIG. 2 (b), from the left to the right, the induced voltage at each line antenna increases toward the position of the electronic pen, and the induced voltage is reversed in the line antenna past the electronic pen.
As described above, in the conventional tablet having the loop antenna and the line antenna, the line antennas are selected one by one, and the principle of determining the position where the waveform of the induced voltage is reversed is determined as the position of the electronic pen.
On the other hand, Figure 2 (c) shows a case in which the detection area is configured by connecting the line antennas to the upper side and extending in the downward direction in the rectangular loop antenna. In this case, since the connection point of the loop antenna and the line antennas is opposite to that of FIG. 2 (a), the waveform of the detected induced voltage also appears to be opposite to the waveform shown in FIG. 2 (b) (FIG. 2 (d)). Reference).
Therefore, in the conventional tablet having the above-described principle and configuration, since one end of all the line antennas is connected to one side of the rectangular shape, the line antennas passing through the sensing area and crossing to the other side of the rectangular shape are Collected close together, they are connected to a line select circuit along the same path.
On the other hand, when manufacturing a tablet having a loop antenna and a line antenna, in order to ensure transparency through the substrate on which the antenna is formed and ease of manufacture, the pattern of the antenna is formed on the transparent film substrate in a single layer by a method such as screen printing. However, in a screen printing method, a pattern cannot be formed in a multi-layer, so that the patterns of a plurality of line antennas coming out of the sensing area and connected to the line selection circuit flow in parallel with each other at regular intervals.
In this case, as the number of line antennas increases, the overall width of the line antenna patterns flowing side by side becomes wider, which is the width of an outer region of the electronic pen sensing region (which becomes a bezel region in a display device with a tablet or tablet). There is a limit to the reduction.
That is, as shown in FIG. 1, if five line antennas are arranged along the horizontal direction, five line antennas must flow side by side to the selection circuit in the upper outer portion of the sensing area.
The present invention is to solve the above problems, to minimize the bezel width occupied by the pattern of the line antennas flowing to the outside of the electronic pen sensing region.
One embodiment of the present invention for achieving the above object, a closed loop connected to the ground, and forming a circumference of the electronic pen detection area set to detect the position of the electronic pen emitting the electromagnetic force using a resonance circuit A loop antenna of the form; A plurality of line antennas arranged in parallel with each other in a comb shape in the closed loop shape of the loop antenna, one end of which is electrically connected to the loop antenna, and the other end of which passes through the sensing area across the loop antenna in an insulated state; Wow; A line selection circuit coupled to the other ends of the plurality of line antennas and configured to select one of the other ends of the plurality of line antennas as a differential output; A coordinate sensing circuit for controlling a selection operation of the line selection circuit and determining a position of the electronic pen with respect to the selected line antenna by using an induced voltage appearing at the differential output by an electromagnetic force emitted from the electronic pen. And the plurality of line antennas parallel to each other are divided into at least two groups, the first group having one end connected to the loop antenna and the other end coupled to the line selection circuit, and the second group having one end It is coupled to the line select circuit and the other end is characterized in that connected to the loop antenna.
The coordinate sensing circuit may invert the induced voltage value from the line antenna of the first group or the induced voltage value from the line antenna of the second group and use the same to determine the position of the electronic pen.
Another embodiment of the present invention for achieving the above object, the lung is connected to the ground, forming a circumference of the electronic pen detection area set to detect the position of the electronic pen emitting the electromagnetic force using a resonant circuit A loop antenna in the form of a loop; A plurality of line antennas arranged in parallel with each other in a comb shape in the closed loop shape of the loop antenna, one end of which is electrically connected to the loop antenna, and the other end of which passes through the sensing area across the loop antenna in an insulated state; Wow; A line selection circuit coupled to the other ends of the plurality of line antennas and configured to select one of the other ends of the plurality of line antennas as a differential output; A coordinate sensing circuit for controlling a selection operation of the line selection circuit and determining a position of the electronic pen with respect to the selected line antenna by using an induced voltage appearing at the differential output by an electromagnetic force emitted from the electronic pen. In addition, the plurality of line antennas, the other end opposite to one end connected to the loop antenna extends to penetrate the sensing area in an insulated state from the loop antenna (first area), and outside of the sensing area And switch to the 'c' shape so as to be coupled to the line selection circuit after completely penetrating the sensing area again (second area) in parallel with other adjacent line antennas while being insulated from the loop antenna. do.
In addition, the coordinate sensing circuit may define a vertical axis (the direction in which the line antenna extends) as a measured induced voltage value and a horizontal axis as positions of the line antennas, and the plurality of line antennas coupled to the line selection circuit. Sampling the induced voltage value at each of the other ends of the waveform to generate a waveform of the measured induced voltage value (measurement waveform), and connecting the inverted waveform (virtual waveform) to the measurement waveform to form an extended waveform, In the extension waveform, a point that intersects the horizontal axis in the ascending direction or a point which intersects in the downward direction is determined as the position of the electronic pen.
In addition, the plurality of line antennas are divided into two groups, and the first group is connected to the loop antenna at one end and penetrates through the sensing area, and the second group is connected to the loop antenna at the other end. Starting through the sensing area, it is configured in a reverse direction to the first group of line antennas.
The present invention can reduce the width occupied by the pattern of the line antennas flowing outward of the electronic pen sensing region by improving the shape and arrangement of the line antenna as described above. As a result, it is possible to minimize the width of the bezel area in the tablet or the display device equipped with the tablet.
Furthermore, according to the present invention, since the number of inputs of the line selection circuit can be reduced to 1/2, the complexity of the pattern design for the circuit configuration is reduced, and the component cost can be reduced because a selection element having a small input can be used. have. In addition, since the number of line antennas to be scanned is reduced to 1/2, the scan speed is improved to enable more accurate coordinate sensing.
1 is a view schematically showing the configuration of a conventional tablet having a loop antenna and a line antenna.
2 is a view for explaining the principle of operation of a conventional tablet having a loop antenna and a line antenna.
3 is a diagram for describing an improved line antenna structure according to an embodiment of the present invention.
4 is a view for explaining an improved line antenna structure and operating principle according to a second embodiment of the present invention.
FIG. 5 is a view showing that the X-axis line antenna and the Y-axis line antenna are formed in the line antenna structure according to the second embodiment.
FIG. 6 is a diagram illustrating a configuration in which the X-axis line antenna is configured in a conventional manner, and only the Y-axis line antenna uses the line antenna structure according to the second embodiment.
FIG. 7 is a diagram illustrating an example of dividing an area of a loop antenna into two lines and arranging line antennas in a 'c' and 'co' shapes in different directions.
FIG. 8 is a diagram illustrating an example in which line antennas of the 'c' and 'co' shapes are configured in combination with each other.
The present invention can reduce the width occupied by the pattern of the line antennas flowing to the outside of the electronic pen sensing region by improving the shape and arrangement of the line antenna in the conventional tablet configuration as shown in FIG. 1.
3 is a diagram for explaining an improved line antenna structure according to the first embodiment of the present invention. In FIG. 3, only a loop antenna and a line antenna in one direction (X-axis line antenna) are illustrated and described for convenience of explanation and understanding.
Referring to FIG. 3 (a), a loop antenna constituting a closed loop of a rectangular shape and an X-axis line connected to the lower side of the loop antenna (one end) and extending upwardly from here and flowing out of the loop antenna (the other end) The configuration of the antenna (first group) and the X-axis line antenna (second group) connected to the upper side of the loop antenna and extending downward to flow outward of the loop antenna can be seen. The other ends of each line antenna are input to the line selection circuit.
If the line antenna is configured as described above, and the electronic pen is positioned at the P point, the form of sampling the induced voltage appearing when scanning each line antenna will be as shown in FIG. That is, first, when the first group of line antennas are scanned from the left side to the position P of the electronic pen, the induced voltage gradually increases in the (+) direction, and the induced voltage is reversed when the electronic pen passes through the position of the electronic pen.
On the other hand, when the scan passes the second group of line antennas, since the connection point of the line antenna with the loop antenna is opposite to the first group of line antennas, the induced voltage again appears in the (+) direction, and the scan is performed by the electronic pen. The farther from the position, the induced voltage decreases.
In the present invention, in the voltage waveform shown in Fig. 3 (b), the second group of waveforms are inverted to form a continuous form as shown in Fig. 3 (c). The operation of inverting the voltage waveforms obtained in the second group may be performed by adding at least one inverter to the path from the output of the second group to the coordinate sensing circuit, or the code of the waveform in the processing algorithm of the coordinate sensing circuit. The inversion can also be realized sufficiently.
If you make this continuous waveform, you can get the same waveform as the voltage waveform in the conventional structure in which all the line antennas are connected to one side of the loop antenna, and the structure and principle of the conventional tablet in determining the position of the electronic pen. Can be used as is.
According to the line antenna pattern having such a structure, since the number of antenna patterns flowing from the outside of one side of the loop antenna to the line selection circuit is reduced to 1/2, the bezel area required outside the loop antenna can be reduced.
4 is a view for explaining an improved line antenna structure and operating principle according to a second embodiment of the present invention. In FIG. 4A, only the loop antenna and the vertical X-axis line antenna are shown for convenience of explanation and understanding.
What is unique about the line antenna pattern of Fig. 4 (a) is that each X-axis line antenna is connected to the lower side of the loop antenna, one end of which extends in the vertical direction and penetrates across the upper side of the loop antenna. Afterwards, it turns into a 'c' shape on the outside of the loop antenna, and enters the loop antenna again from an adjacent position again and exits completely across the loop antenna while keeping parallel with other line antennas. will be. The other end of the X-axis line antenna passes through the loop antenna and is then connected to the line select circuit.
In the following description, a portion of the line antennas disposed in an extended form from one end connected to the loop antenna is referred to as a first region, and a portion that crosses and crosses again through the outside of the loop antenna is referred to as a second region. do.
By constructing this type of line antenna, it is possible to arrange the line antenna in the entire range of the electronic pen sensing region by the loop antenna while reducing the number of line antennas by 1/2 compared to the conventional configuration.
On the other hand, in such a structure, a special technique is required to detect the position of the electronic pen by the induced voltage obtained by scanning the line antenna. This will be described with reference to FIG.
4 (b) to 4 (d) show measured and generated induced voltage waveforms for various positions of the electronic pen shown in FIG. 4 (a) in the line antenna structure as shown in FIG. 4 (a). to be. 4 (b) to 4 (d), the waveform of the induced voltage is composed of two parts, the actual measurement waveform and the inverted virtual waveform.
In the line antenna structure according to the second embodiment, rather than connecting individual line antennas to the entire area of the loop antenna, the line antennas are penetrated twice by reducing the line antennas by half, so that the line antennas to be scanned The number of is reduced to 1/2. Thus, the number of sampled and measured induced voltages is also 1/2.
4 (b) to 4 (d) are waveforms showing magnitudes of induced voltages obtained by scanning each line antenna one by one.
First, FIG. 4B is a diagram showing the magnitude of the scanned induced voltage when the electronic pen is in the A position of the line antenna configuration of FIG. In the actual measurement waveform of Fig. 4 (b), the magnitude (absolute value) of the induced voltage increases from the left line antenna to the position A of the electronic pen in the negative direction, and then the position A of the electronic pen is changed. The induced voltage is reversed from the passing line antenna ((+) direction) and the size decreases as the line antenna moves away from the position A of the electronic pen.
Next, FIG. 4 (c) shows the scanned induced voltage waveform when the electronic pen is positioned at the B position of FIG. 4 (a). Since the position (B) of the electronic pen spans the last line antenna connected to the loop antenna, the actual measurement waveform is a waveform in which the magnitude increases in the negative direction from the leftmost line antenna to the line antenna at point B. Will appear.
Next, Fig. 4 (d) shows the scanned induced voltage waveform when the electronic pen is located at the C position of Fig. 4 (a), in which case, the line antenna around the C point is located outside the upper side of the loop antenna. As it penetrates downward, the measured induced voltage will appear in the opposite direction to the induced voltage of FIGS. 4 (b) and 5 (c) above. Thus, in the waveform of FIG. 4D, the induced voltage measured from the first line antenna of the second region appears in the (+) direction, and is reversed while passing through the position C of the electronic pen to become the (−) direction.
Meanwhile, in the second embodiment of the present invention, the waveform of the induced voltage can be obtained only for half of the loop antenna constituting the electronic pen sensing region. Therefore, the waveform of the induced voltage should also be made for the other half, which may use the induced voltage waveform obtained by scanning previously. That is, a virtual waveform is generated by inverting the previously measured actual measured waveform by +/−, and then connected with the actual measured waveform to generate a waveform that is twice as long as it is.
The point at which the induced voltage crosses the horizontal axis (eg, ground) with a positive slope from the generated extension waveform is regarded as the point where the electronic pen is located.
That is, in FIG. 4 (b), since the intersection point of the positive slope is found at any point of the actual measurement waveform, this point may be regarded as the position of the electronic pen. In addition, in Fig. 4 (c), the end of the actual measurement waveform is in contact with the negative part of the horizontal axis, and the virtual waveform starts from the beginning (+), so this point can be determined as the position of the electronic pen. .
On the other hand, in FIG. 4 (d), since the measured waveform crosses the horizontal axis with a negative slope in the actual measurement waveform, this point is not the position of the electronic pen, and the horizontal axis and the positive slope only in the virtual waveform. The point at which the intersecting with appears, and this point can be determined as the position of the electronic pen.
According to this method, while reducing the number of line antennas in half, it is possible to measure the positions of the electronic pens in all the electronic pen sensing regions.
In addition, according to such a line antenna structure, since the outside of the loop antenna may have a pattern for only half the number of line antennas as compared with the related art, the width of the bezel outside the loop antenna can be reduced.
In addition, since the number of inputs of the line selection circuit can be reduced to 1/2, the complexity of the pattern design for the circuit configuration is reduced, and the component cost can be used because a selection element (for example, a multiplexer) having a small input can be used. Can be reduced. In addition, since the number of line antennas to be scanned is reduced to 1/2, the scan speed is improved to enable more accurate coordinate sensing.
Next, FIGS. 5 to 8 are views illustrating a line antenna configuration method according to various embodiments of the present disclosure.
FIG. 5 is a view showing that the X-axis line antenna and the Y-axis line antenna are formed in the line antenna structure according to the second embodiment. In FIG. 5, a loop antenna having a rectangular shape, an X-axis line antenna arranged in a 'c' shape in a vertical direction, and a Y-axis line antenna arranged in a 'c' shape in a horizontal direction can be seen.
According to this configuration, since the number of line antennas can be reduced to 1/2, the number of line antennas to be scanned as a whole can be reduced to 1/2 and the bezel area can be reduced.
FIG. 6 shows a configuration in which the X-axis line antenna is configured in a form in which all ends are connected to one side in a conventional manner, and only the Y-axis line antenna uses the line antenna structure according to the second embodiment. Such a configuration can be applied to the case where the width constraint is limited for both side bezel regions, but the width constraint is relaxed for the upper or lower bezel regions.
FIG. 7 illustrates that when configuring a line antenna of one axis, the loop antenna is divided into two regions, and in the divided region, the loop antenna is returned to the 'c' shape while the line antenna is connected to the loop antenna. To be configured. In another divided region, the line antenna is configured to return to the 'CO' shape while being connected to the loop antenna on the opposite side.
In a similar example, in FIG. 8, line antennas of the 'c' and 'co' shapes are combined with each other.
This configuration can be appropriately selected in accordance with the design requirements of the tablet, and the electronic pen position sensing method in each case can be realized by appropriately combining the above description.
On the other hand, in the above-described line antenna configuration of the second embodiment, the line antenna first connected to the leftmost side of the lower side of the loop antenna in the first region is redirected from the outside of the loop antenna to the inside of the loop antenna again in the second region. When entering, it is arranged in the leftmost position. However, alternatively, the leftmost line antenna of the first region may be disposed to the rightmost of the second region, and the rightmost line antenna of the first region may be set as the first line antenna to the left of the second region.
According to this structure, since the line antennas do not cross each other outside the loop antenna, the configuration of the antenna pattern is easier.
In addition, in the above description, the loop antenna is described as being connected to ground, and the ground antenna is connected to the input of the differential amplifier. However, when the input of either of the loop antenna and the differential amplifier is the same potential, the other potential is different. You can also connect with.
Claims (5)
A plurality of line antennas arranged in parallel with each other in a comb shape in the closed loop shape of the loop antenna, one end of which is electrically connected to the loop antenna, and the other end of which passes through the sensing area across the loop antenna in an insulated state; Wow;
A line selection circuit coupled to the other ends of the plurality of line antennas and configured to select one of the other ends of the plurality of line antennas as a differential output;
A coordinate sensing circuit for controlling a selection operation of the line selection circuit and determining a position of the electronic pen with respect to the selected line antenna by using an induced voltage appearing at the differential output by an electromagnetic force emitted from the electronic pen. and,
The plurality of line antennas parallel to each other are divided into at least two groups, and the first group has one end connected to the loop antenna, the other end coupled to the line selection circuit, and the second group has one line at one end. A tablet having an improved structure of line antenna, characterized in that it is coupled to a selection circuit and the other end is connected to the loop antenna.
The coordinate sensing circuit,
And an induction voltage value from the first group of line antennas or an induction voltage value from the second group of line antennas is used to determine the position of the electronic pen.
A plurality of line antennas arranged in parallel with each other in a comb shape in the closed loop shape of the loop antenna, one end of which is electrically connected to the loop antenna, and the other end of which passes through the sensing area across the loop antenna in an insulated state; Wow;
A line selection circuit coupled to the other ends of the plurality of line antennas and configured to select one of the other ends of the plurality of line antennas as a differential output;
A coordinate sensing circuit for controlling a selection operation of the line selection circuit and determining a position of the electronic pen with respect to the selected line antenna by using an induced voltage appearing at the differential output by an electromagnetic force emitted from the electronic pen. and,
The plurality of line antennas, the other end opposite to one end connected to the loop antenna, extends so as to penetrate the sensing region in an insulated state from the loop antenna (first region) and outside the sensing region. An 'to be redirected to a' shaped 'shape and configured to be coupled to the line selection circuit after completely penetrating the sensing area again (second area) in parallel with another adjacent line antenna in isolation from the loop antenna. Tablet with line antenna of a conventional structure.
The coordinate sensing circuit,
The vertical axis (the direction in which the line antenna extends) is defined as the measured induction voltage value, and the horizontal axis is defined as the position of the line antennas, and the induced voltage value at each of the other ends of the plurality of line antennas coupled to the line selection circuit. Sampling to generate a waveform (measurement waveform) of the measured induced voltage value, and connect the waveform (virtual waveform) obtained by inverting the measurement waveform to the measurement waveform to form an extension waveform, and in the extension waveform, A tablet having an improved structure of a line antenna, characterized in that it is determined as the position of the electronic pen a point crossing in a rising direction or a crossing in a descending direction.
The plurality of line antennas are divided into two groups,
The first group starts with one end connected to the loop antenna to penetrate the sensing region,
The second group of tablets having an improved structure of the line antenna, characterized in that the other end is connected to the loop antenna and started to penetrate through the detection area in a reverse direction to the line antenna of the first group.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020120030781A KR101321041B1 (en) | 2012-03-26 | 2012-03-26 | Tablet with improved line-antena structure |
| PCT/KR2013/002450 WO2013147474A1 (en) | 2012-03-26 | 2013-03-25 | Tablet having line antenna with improved structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020120030781A KR101321041B1 (en) | 2012-03-26 | 2012-03-26 | Tablet with improved line-antena structure |
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| Publication Number | Publication Date |
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| KR20130108930A true KR20130108930A (en) | 2013-10-07 |
| KR101321041B1 KR101321041B1 (en) | 2013-10-23 |
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| KR1020120030781A KR101321041B1 (en) | 2012-03-26 | 2012-03-26 | Tablet with improved line-antena structure |
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| KR (1) | KR101321041B1 (en) |
| WO (1) | WO2013147474A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101515782B1 (en) * | 2014-04-07 | 2015-05-04 | 주식회사 더한 | Tablet having minimized antenna pattern |
| KR20150113825A (en) | 2014-03-31 | 2015-10-08 | 엘지이노텍 주식회사 | Touch panel with improved intersecting structure of sensing patterns |
| US9547405B2 (en) | 2014-03-31 | 2017-01-17 | Lg Innotek Co., Ltd. | Touch panel having intersection structures for sensing patterns |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0213237D0 (en) * | 2002-06-07 | 2002-07-17 | Koninkl Philips Electronics Nv | Input system |
| KR101183379B1 (en) * | 2005-05-20 | 2012-09-14 | 엘지전자 주식회사 | Pen input device with data storage |
| KR101146209B1 (en) * | 2009-09-10 | 2012-05-25 | (주)옴니오 | System and method for inputting information |
| KR101124522B1 (en) | 2010-06-16 | 2012-03-19 | 주식회사 윈터치 | Tablet case for mobile device |
| KR101076369B1 (en) * | 2010-07-06 | 2011-10-25 | 씨에스제이글로벌 주식회사 | Electronic pen and tablet for digitizing apparatus |
-
2012
- 2012-03-26 KR KR1020120030781A patent/KR101321041B1/en active IP Right Grant
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2013
- 2013-03-25 WO PCT/KR2013/002450 patent/WO2013147474A1/en active Application Filing
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150113825A (en) | 2014-03-31 | 2015-10-08 | 엘지이노텍 주식회사 | Touch panel with improved intersecting structure of sensing patterns |
| KR20150113846A (en) | 2014-03-31 | 2015-10-08 | 엘지이노텍 주식회사 | Touch panel with improved intersecting structure of sensing patterns |
| US9547405B2 (en) | 2014-03-31 | 2017-01-17 | Lg Innotek Co., Ltd. | Touch panel having intersection structures for sensing patterns |
| US10055077B2 (en) | 2014-03-31 | 2018-08-21 | Lg Innotek Co., Ltd. | Touch panel for improving cross structure of sensing pattern |
| KR101515782B1 (en) * | 2014-04-07 | 2015-05-04 | 주식회사 더한 | Tablet having minimized antenna pattern |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2013147474A1 (en) | 2013-10-03 |
| KR101321041B1 (en) | 2013-10-23 |
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