JP2008084223A - Electromagnetic induction type touch panel, and liquid crystal display equipped therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display equipped with an electromagnetic induction type touch panel, capable of preventing erroneous detection from being generated, and capable of detecting a touch panel area with high reliability. <P>SOLUTION: This liquid crystal display is provided with an electromagnetic pen 15 for touching a touch face comprising a face in an observation side of a liquid crystal display element, and a sensor substrate arranged in a side opposite to the observation side of the liquid crystal display element, and provided with a plurality of sensors for receiving a magnetic field from the electromagnetic pen to generate an induction current, and the electromagnetic pen 15 is constituted of a pen body 16, a movable shaft 17 provided inside the pen body 16 movably along a longitudinal direction thereof, having a pen tip part 18 for touching the touch face in its tip, pressed by a coil spring 24 along a direction to project the pen tip part 18 from the tip of the pen body 16, and pressed in along a pen body inner direction by the pressing of the pen tip part 18 onto the touch face, a magnetic field generation coil 19 provided in the vicinity of the tip of the pen body 16, and a driving part 20 provided inside the pen body 16, and turned on by the press-in of the movable shaft 17 to supply an excitation current to the magnetic field generation coil 19. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electromagnetic induction type touch panel and a liquid crystal display device including the same.

  The electromagnetic induction type touch panel is disposed on the back side of the touch surface and a touch input electromagnetic pen for selectively touching a plurality of touch regions on the touch surface, and corresponds to the plurality of touch regions on the touch surface, respectively. And a touch area detection sensor substrate provided with a plurality of sensors that generate an induced current in response to a magnetic field from the electromagnetic pen (see Patent Document 1).

This electromagnetic induction type touch panel uses a magnetic field, and since the magnetic field passes through the liquid crystal display element without affecting its display, the surface on the observation side of the liquid crystal display element is touched by the electromagnetic pen. The sensor panel can be disposed on the opposite side of the liquid crystal display element from the observation side.
JP 2004-302431 A

  However, in the conventional electromagnetic induction type touch panel, when the electromagnetic pen is brought closer to the touch surface to some extent, the sensor on the sensor substrate receives the magnetic field from the electromagnetic pen and generates an induced current, which causes erroneous detection of the touch area. There is a fear.

  An object of the present invention is to provide an electromagnetic induction type touch panel capable of performing highly reliable touch area detection without causing erroneous detection, and a liquid crystal display device including the electromagnetic induction type touch panel. is there.

The electromagnetic induction type touch panel of the present invention is
A touch surface having a plurality of predetermined touch areas;
A pen body, and a pen body which is provided in the pen body so as to be movable in a length direction thereof, and has a pen point part for touching the touch surface at a tip, and the pen point part is a tip of the pen body by a spring force. A movable member that is pressed in a direction projecting from the touch surface and is pushed toward the pen body by pressing the pen tip against the touch surface, a magnetic field generating coil provided near the tip of the pen body, An electromagnetic pen for touch input that is provided in a pen body and includes a drive unit that supplies an excitation current to the magnetic field generating coil by pressing the movable member;
A plurality of sensors that are arranged on the rear side of the touch surface and that are opposed to the touch surface and that generate an induced current by receiving a magnetic field from the electromagnetic pen are provided corresponding to the plurality of touch areas, respectively. Touch area detection sensor substrate,
It is characterized by providing.

Moreover, the liquid crystal display device provided with the electromagnetic induction type touch panel of the present invention is
A screen area in which a plurality of pixels for controlling light transmission are arranged in a matrix form, an image display, and a key display for displaying touch input keys in a plurality of predetermined touch areas in the screen area, respectively. A liquid crystal display element to perform;
A pen body, a pen body which is provided in the pen body so as to be movable in the length direction thereof, and has a pen tip part for touching a touch surface formed by a surface on the observation side of the liquid crystal display element at the tip, and a spring force The pen tip portion is pressed in a direction protruding from the tip of the pen barrel, and a movable member that is pushed toward the pen barrel by pressing the pen tip against the touch surface, and a tip in the pen barrel A magnetic field generating coil provided in the vicinity; and a touch input electromagnetic pen comprising a drive unit that is provided in the pen body and supplies an excitation current to the magnetic field generating coil by pressing the movable member;
The liquid crystal display element is disposed on the opposite side to the viewing side, and an induced current is generated by receiving a magnetic field from the electromagnetic pen on a surface facing the liquid crystal display element, corresponding to each of the plurality of touch areas. A sensor substrate for detecting a touch area provided with a plurality of sensors;
It is characterized by providing.

  Since the electromagnetic induction touch panel and the liquid crystal display device including the electromagnetic induction touch panel according to the present invention have the above-described configuration, it is possible to perform highly reliable touch area detection without causing erroneous detection. .

  1 to 11 show an embodiment of the present invention, and FIG. 1 is an exploded perspective view of a liquid crystal display device provided with an electromagnetic induction type touch panel.

  This liquid crystal display device has a screen area 7 in which a plurality of pixels (not shown) for controlling the transmission of light are arranged in a matrix, and displays an image and a plurality of predetermined touches in the screen area 7. A liquid crystal display element 1 that performs key display for displaying a touch input key in each region 8 is disposed on the side opposite to the observation side (upper side in FIG. 1) of the liquid crystal display element 1, and faces the liquid crystal display element 1. Touch input electromagnetic pen 15 and touch area detection sensor substrate 38 for constituting an electromagnetic induction type touch panel in which a surface light source 9 for irradiating illumination light and an observation side surface of the liquid crystal display element 1 is a touch surface 1a. And.

  The liquid crystal display element 1 is a transmissive active matrix liquid crystal display element using, for example, a TFT (thin film transistor) as an active element, and its cross-sectional structure is not shown in the figure, but the observation side bonded via a frame-shaped sealing material 4 A liquid crystal layer is enclosed in a region surrounded by the sealing material 4 between the pair of transparent substrates 2 and 3 on the opposite side, and one of the opposing inner surfaces of the pair of substrates 2 and 3, for example, the substrate 3 on the opposite side. A plurality of transparent pixel electrodes formed in a matrix on the inner surface, a plurality of TFTs respectively connected to these pixel electrodes, a plurality of scanning lines for supplying gate signals to the TFTs in each row, A plurality of signal lines for supplying data signals to the TFTs in each row are provided, and a single film-like transparent film corresponding to the entire array region of the plurality of pixel electrodes is provided on the inner surface of the other direction substrate, that is, the observation side substrate 2. A counter electrode; and a color filter of three colors of red, green, and blue formed to correspond to each of a plurality of pixels including regions where the plurality of pixel electrodes and the counter electrode oppose each other; The polarizing plates 5 and 6 are arranged on the outer surfaces of the substrates 2 and 3, respectively.

  The liquid crystal display element 1 includes a TN or STN type in which the liquid crystal molecules of the liquid crystal layer are twist-aligned, a vertical alignment type in which the liquid crystal molecules are aligned substantially perpendicular to the surfaces of the substrates 2 and 3, and the liquid crystal molecules are twisted. A horizontal alignment type that is aligned substantially parallel to the surfaces of the substrates 2 and 3 without bending, a bend alignment type that bends liquid crystal molecules, or a ferroelectric or antiferroelectric liquid crystal display element. The pair of polarizing plates 5 and 6 are arranged with their transmission axes oriented so as to obtain good contrast.

  In the liquid crystal display element 1 of this embodiment, an electric field is generated between the electrodes provided on the inner surfaces of the pair of substrates 2 and 3 to change the alignment state of the liquid crystal molecules. Provides, for example, comb-shaped first and second electrodes that form a plurality of pixels on the inner surface of one of a pair of substrates, and generates a horizontal electric field (an electric field in a direction along the substrate surface) between these electrodes. It may be of a lateral electric field control type that changes the alignment state of the liquid crystal molecules.

  The liquid crystal display element 1 is driven by a display driving circuit (not shown), and normally displays an image over the entire screen area 7, and when the touch input by the electromagnetic induction touch panel is performed, Touch input keys are respectively displayed in a plurality of predetermined touch areas 8 arranged in the row direction and the column direction.

  Each of the plurality of touch areas 8 is a square or rectangular area having a vertical and horizontal width of 5 to 15 mm, for example, and the liquid crystal display element 1 has a key shape and a key type of the plurality of touch input keys. Numbers, symbols, etc. (not shown) shown are displayed by several tens of pixel groups respectively corresponding to the touch area 8.

  The surface light source 9 is made of a plate-like transparent member having an area facing at least the screen area of the liquid crystal display element 1, and an incident end face 11 for allowing light to enter is formed on one end face thereof, and the liquid crystal display element A light exit surface 12 for light incident from the incident end surface 11 is formed on one plate surface facing 1, and a light reflecting surface that reflects the light incident from the incident end surface 11 on the other plate surface toward the light exit surface 12. And a plurality of light emitting elements 14 such as LEDs (light emitting diodes) arranged to face the incident end face 11 of the light guide plate 10.

  Next, the electromagnetic induction type touch panel will be described. The electromagnetic induction type touch panel includes a touch surface 1a including an observation side surface of the liquid crystal display element 1 (an outer surface of the observation side polarizing plate 5), and the liquid crystal display element 1. An electromagnetic pen 15 for selectively touching a plurality of touch areas 8 on the touch surface 1a and applying a magnetic field to the touch areas 8 is disposed on the opposite side of the liquid crystal display element 1 from the observation side. The surface facing the liquid crystal display element 1 is guided by the magnetic pen 15 corresponding to the plurality of touch areas of the liquid crystal display element 1 and receiving the magnetic field that has passed through the liquid crystal display element 1. The touch-area detecting sensor substrate 38 is provided with a plurality of sensors 40 that generate current.

  In the liquid crystal display device of this embodiment, the surface light source 9 is disposed on the opposite side of the liquid crystal display element 1 from the observation side, and the sensor substrate 38 receives the light emitted from the surface light source 9. It is arranged on the rear side of the surface light source 9 (on the side opposite to the side facing the liquid crystal display element 1) so as not to block.

  FIG. 2 is a cross-sectional view of the electromagnetic pen 15. The electromagnetic pen 15 is provided with a pen body 16 formed of a cylindrical member, and is provided in the pen body 16 so as to be movable in the length direction thereof. The pen tip portion 18 having an inverted conical shape for touching the surface 1a is pressed, and the pen tip portion 18 is pressed in a direction protruding from the tip of the pen body 16 by a spring force, and the pen is applied to the touch surface 1a. A movable member 17 that is pushed inwardly by the pressing of the tip 18, a magnetic field generating coil 19 provided in the vicinity of the tip of the pen body 16, and a movable member 17 that is provided in the pen body 16 and is movable. The driving unit 20 is turned on when the member 17 is pushed and supplies an exciting current to the magnetic field generating coil 19.

  The movable member 17 is composed of, for example, a round bar-shaped shaft member provided in the center of the pen body 16 in parallel with the length direction of the pen body 16 (hereinafter, this movable member is referred to as a movable shaft). ), The magnetic field generating coil 19 is wound around a coil winding portion 17a formed on the distal end side of the movable shaft 17 so as to be close to the pen tip portion 18.

  The drive unit 20 includes a switch box 23 provided on the rear end side in the pen body 16, and a first and second pair of button-type batteries 27a and 27b disposed on the rear surface of the switch box 23. And an alternating current generating circuit 31 disposed on the rear end side of the pen body 16 with respect to the switch box 23.

  FIG. 3 is an enlarged cross-sectional view of the electromagnetic pen 15 on the drive unit arrangement side, and FIG. 4 is a cross-sectional view taken along line IV-IV in FIG.

  As shown in FIGS. 3 and 4, the switch box 23 is made of a resin molded product, and has a circular shape for inserting the rear end side of the movable shaft 17 into the center thereof so as to be slidable in the axial direction. The first and second fixed contact members 25, 26 made of a metal plate having a circular hole portion having a circular cross section corresponding to the through hole 23 a are provided in the movable shaft 17. These are arranged in a fixed state with a predetermined interval in the sliding direction.

  The switch box 23 is arranged on the rear end side of the pen body 16 so that the through hole 23a coincides with the center of the pen body 16, and is fixed to the pen body 16 with a screw or the like (not shown).

  On the other hand, the rear end of the movable shaft 17 slides in the through hole 23a of the switch box 23 together with the movable shaft 17, and the first and second fixed contact members 25, 26 are arranged on the outer peripheral surface. A movable contact member 21 made of a circular metal plate that selectively contacts the peripheral surface of the hole is fixed.

  The movable shaft 17 projects the pen tip 18 from the tip of the pen body 16 into the pen body 16 and inserts the rear end side of the movable shaft 17 into the through hole 23 a of the switch box 23. The outer peripheral surface of the end of the pen tip 18 on the movable shaft 17 side (an inverted conical base) is guided by the inner peripheral surface on the distal end side of the pen body 16, and the rear end of the movable shaft 17. The side of the switch box 23 is guided by the through hole 23a so as to move in the axial direction.

  Further, a spring receiving plate 22 facing the surface opposite to the rear surface of the switch box 23 is fixed to the rear end side of the movable shaft 17, and the movable shaft 17 is connected to the receiving plate 22 and the surface of the movable shaft 17. The pen tip 18 is pressed in a direction protruding from the tip of the pen body 16 by the spring force of the coil spring 24 interposed between the switch box 23 and the pen on the touch surface 1 a of the liquid crystal display element 1. The pen body 16 is pushed inward by the pressing of the tip 18.

  In this embodiment, two coil springs 24 are disposed between the receiving plate 22 of the movable shaft 17 and the switch box 23 and are respectively disposed at two positions corresponding to each other with the movable shaft 17 interposed therebetween. However, between the receiving plate 22 of the movable shaft 17 and the switch box 23, one coil spring having a winding diameter larger than that of the movable shaft 17 is loosely fitted to the movable shaft 17 and interposed. The movable shaft 17 may be pressed by the one coil spring in a direction in which the pen tip 18 protrudes from the tip of the pen body 16.

  Although not shown in the drawing, a stopper for restricting the movement limit of the movable shaft 17 in both the front end direction and the rear end direction is provided in the pen body 16, and the pen of the movable shaft 17 is provided. The tip 18 projects to the projecting limit position a shown in FIG. 2 by the spring force of the coil spring 24, and retreats to the pushing limit position b shown in FIG. 2 by the pressing force to the touch surface 1a.

  The movable contact member 21 at the rear end of the movable shaft 17 is fixed to the first and second fixed portions as shown in FIG. 3 when the pen tip portion 18 of the movable shaft 17 projects to the projecting limit position a. The first fixed contact member 25 and the first fixed contact member 25 are separated from the contact members 25 and 26 as the movable shaft 17 is pushed inward in the pen body 16 by pressing the pen tip 18 against the touch surface 1a. The second fixed contact member 26 is positioned and provided so as to sequentially contact.

  FIG. 5 is an enlarged cross-sectional view when the movable shaft 17 on the drive unit arrangement side of the electromagnetic pen 15 is pushed halfway, and FIG. 6 shows the movable shaft 17 on the drive unit arrangement side pushed to the push limit. The movable contact member 21 is pushed inwardly in the pen body 16 of the movable shaft 17 by pressing the pen tip portion 18 against the touch surface 1a of the liquid crystal display element 1. First, as shown in FIG. 5, the second fixed contact member 25 is separated from the first fixed contact member 25 as it comes into contact with the first fixed contact member 25 and the movable shaft 17 is pushed to the pushing limit. The fixed contact member 26 is contacted.

  Further, on the rear surface of the switch box 23, there are provided first and second pairs of positive electrode terminals 28a and 28b which are in contact with electrodes on one surface of the pair of button type batteries 27a and 27b, for example, positive electrodes. The pair of button-type batteries 27a and 27b are disposed on the pair of positive electrode terminals 28a and 28b, respectively, with the positive electrode in contact with the positive electrode terminals 28a and 28b, The switch box 23 is fixed to the rear surface of the switch box 23 with screws 30 or the like, and is held down by the electrodes on the other surface of the button-type batteries 27a and 27b, that is, the first and second pairs of negative electrode terminals 29a and 29b that are in contact with the negative electrode. It is fixed.

  The first positive electrode terminal 28a and the second negative electrode terminal 29b are electrically connected by a connection line (not shown), and the first positive electrode terminal 28a is connected to a connection line 32. To the first fixed contact member 25.

  The second positive electrode terminal 28 b is connected to the second fixed contact member 26 by a connection line 33, and the first negative electrode terminal 29 a is connected to the first fixed electrode member 29 by a connection line 34. The fixed contact member 25 is connected.

  On the other hand, the AC current generating circuit 31 includes two input terminals and two output terminals, although the configuration thereof is not shown, and a voltage is supplied between the two input terminals, corresponding to the voltage value. A strong alternating current, that is, an exciting current for generating a magnetic field in the magnetic field generating coil 19 is generated, and the exciting current is supplied to the magnetic field generating coil 19 from the two output terminals.

  The first negative electrode terminal 29 a is connected to one input terminal of the alternating current generating circuit 31 by a connection line 35, and the movable contact member 21 at the rear end of the movable shaft 17 is connected by a connection line 36. The AC current generating circuit 31 is connected to the other input terminal, and the two output terminals of the AC current generating circuit 31 are connected to the distal end side of the movable shaft 17 by connection lines 37a and 37b. The coil 19 is connected to both ends.

  Since the electromagnetic pen 15 includes the drive unit 20 configured as described above, when the touch surface 1a of the liquid crystal display element 1 is not touched by the pen tip unit 18, the drive unit 20 is turned off. Therefore, the exciting current is not supplied from the driving unit 20 to the magnetic field generating coil 19.

  On the other hand, when the pen tip 18 is pressed against the touch surface 1a with a certain amount of pressing force, the drive unit 20 is turned on by contact between the movable contact member 21 and the first fixed contact member 25, and this drive unit When an exciting current is supplied from 20 to the magnetic field generating coil 19 and the pen tip portion 18 is further pressed against the touch surface 1a, the movable contact member 21 comes into contact with the second fixed contact member 26, and the drive A larger excitation current is supplied from the unit 20 to the magnetic field generating coil 19.

  That is, FIG. 7 is a circuit diagram when the movable shaft 17 of the electromagnetic pen 15 is projected to the projecting limit. At this time, the movable contact member 21 at the rear end of the movable shaft 17 is the first and first members. 2, the battery voltage is not supplied to the alternating current generating circuit 31, and therefore, the exciting current is supplied from the alternating current generating circuit 31 to the magnetic field generating coil 19. Never happen.

  FIG. 8 is a circuit diagram when the movable shaft 17 of the electromagnetic pen 15 is pushed halfway (position where the movable contact member 21 contacts the first fixed contact member 25). Due to the contact between the member 21 and the first fixed contact member 25, the voltage of the first button-type battery 27 a is supplied between the two input terminals of the alternating current generating circuit 31. The magnetic field generating coil 19 is supplied with a first excitation current having a value corresponding to the voltage of the first button type battery 27a.

  FIG. 9 is a circuit diagram when the movable shaft 17 of the electromagnetic pen 15 is pushed down to the pushing limit (position where the movable contact member 21 contacts the second fixed contact member 26). The first button-type battery 27a and the second button-type battery 27b are connected in series by the contact between the movable contact member 21 and the second fixed contact member 26, and the two batteries 27a and 27b are connected to each other. Since a high voltage on which the voltage is superimposed is supplied between the two input terminals of the alternating current generating circuit 31, a current value larger than the first exciting current is supplied from the alternating current generating circuit 31 to the magnetic field generating coil 19. The second exciting current is supplied.

  Accordingly, the magnetic field generating coil 19 does not generate a magnetic field when the touch surface 1a is not touched by the pen tip 18, and when the pen tip 18 is pressed against the touch surface 1a with a certain pressing force. When the first excitation current is supplied from the alternating current generation circuit 31 to generate a magnetic field having a strength corresponding to the excitation current, and the pen tip portion 18 is pressed more strongly against the touch surface 1a. A second excitation current larger than the first excitation current is supplied from the alternating current generation circuit 31 to generate a magnetic field stronger than the magnetic field generated by the first excitation current.

  Next, the touch area detection sensor substrate 38 will be described. FIG. 10 is a plan view of the sensor substrate 38, and FIG. 11 is an enlarged sectional view of one sensor portion of the sensor substrate 38.

  The sensor substrate 38 is provided by the electromagnetic pen 15 on the surface of the substrate body 39 made of an insulating plate member that faces the liquid crystal display element 1, and the light guide plate 10 of the liquid crystal display element 1 and the surface light source 9. A plurality of sensors 40 that generate an induced current in response to a magnetic field that has passed through are arranged in a row direction and a column direction so as to correspond to each of the plurality of touch regions 8 of the liquid crystal display element 1. Each of the plurality of sensors 40 on the sensor substrate 38 of this embodiment has a substantially quadrangular or circular spiral shape on the surface of the substrate body 39 from the vicinity of the center of the region corresponding to the touch region 8 to the vicinity of the outer periphery (see FIG. In this case, the conductive film 41 is formed in a rectangular spiral shape.

  Further, on the peripheral portion of the sensor formation surface of the substrate body 39, one ground terminal 42 provided at an arbitrary position and an edge on one end side in the row direction are provided corresponding to each sensor row. A plurality of row direction output terminals 43 and a plurality of column direction output terminals 44 provided corresponding to each sensor column at an edge portion on one end side in the column row direction. One end of each of the plurality of sensors 40 formed on the surface of the main body 39 (the end portion on the center side of the spiral) is connected to the one of the plurality of sensors 40 via the ground wiring 42a formed on the surface opposite to the sensor forming surface of the substrate main body 39. The other end of the plurality of sensors 40 (the end portion on the outer periphery side of the spiral) is connected to the ground terminal 42, and the row for each row formed on the sensor forming surface of the substrate body 39 for each row and for each column. Via the direction output wiring 43a and the column direction output wiring 44a for each column, It is connected serial to a plurality of row-direction output terminal 43 and the plurality of column output terminal 44.

  The ground wiring 42a formed on the surface opposite to the sensor formation surface of the substrate body 39 is located on the center side of the spiral of the plurality of sensors 40 in a through hole portion that penetrates the substrate body 39. And the ground terminal 42 are connected.

  The ground terminal 42 of the sensor substrate 38 is connected to a ground potential (not shown), and the plurality of row direction output terminals 43 and the plurality of column direction output terminals 44 are connected to the plurality of row direction output terminals 43. Based on the output and the outputs from the plurality of column direction output terminals 44, the touch area by the electromagnetic pen 15, that is, an input key determination circuit (not shown) that determines a touched input key is connected.

  In this liquid crystal display device, the electromagnetic induction type touch panel is provided so as to be movable in the length direction in the pen body 16 and the pen body 16, and is formed at the tip of the surface on the observation side of the liquid crystal display element 1. There is a pen tip 18 for touching the touch surface 1a, and the pen tip 18 is pressed in a direction protruding from the tip of the pen body 16 by a spring force, and the pen tip 18 to the touch surface 1a is pressed. The movable shaft 17 that is pushed inwardly by the pressing of the pen body 16, the magnetic field generating coil 19 provided near the tip of the pen body 16, the pen body 16, and the movable shaft 17. A touch input electromagnetic pen 15 including a drive unit 20 that supplies an excitation current to the magnetic field generating coil 19 by pressing, and a side opposite to the observation side of the liquid crystal display element 1 (in this embodiment, the surface light source 9 A plurality of electrodes that generate an induced current in response to a magnetic field from the electromagnetic pen 15 so as to correspond to the plurality of touch areas 8 of the liquid crystal display element 1 on the surface facing the liquid crystal display element 1, respectively. Therefore, the electromagnetic induction touch panel can perform highly reliable touch area detection without causing erroneous detection. .

  That is, in the liquid crystal display device, the pen tip 18 is pressed by the electromagnetic pen 15 constituting the electromagnetic induction touch panel in a direction in which the pen tip portion 18 protrudes from the tip of the pen body 16 by a spring force, and the pen tip on the touch surface 1a. A movable shaft 17 that is pushed inward by the pressing of the portion 18 and the magnetic field generating coil 19 that is turned on by the pushing of the movable shaft 17 and is provided in the vicinity of the tip of the pen barrel 16. When the touch surface 1a is not touched by the pen tip portion 18 of the electromagnetic pen 15, the magnetic field generating coil 19 does not generate a magnetic field. When the electromagnetic pen is brought close to the touch surface to some extent like an electromagnetic induction touch panel, the sensor on the sensor board receives the magnetic field from the electromagnetic pen and guides it. Generates a flow, it does not result in erroneous detection of a touch area.

  In addition, in this embodiment, the drive unit 20 of the electromagnetic pen 15 includes the first and second button type batteries 27a and 27b, the first and second fixed contact members 25 and 26, and the movable shaft 17. A movable contact member 21 that sequentially contacts the first fixed contact member 25 and the second fixed contact member 26 as the pen body 16 is pushed inward is provided, and the pen tip portion 18 is provided on the touch surface 1a. Is pressed with a certain pressing force, a first excitation current corresponding to the voltage of the first button-type battery 27a is supplied from the alternating current generating circuit 31 to the magnetic field generating coil 19, and the first When a magnetic field having a strength corresponding to the excitation voltage is generated and the pen tip portion 18 is pressed more strongly against the touch surface 1a, the alternating current generation circuit 31 applies the first and second magnetic field generation coils 19 to the magnetic field generation coil 19. Two button type batteries 27a A second exciting current voltage 27b is corresponding to the strong voltage superimposed is supplied, corresponding to the second excitation current, it is possible to generate a strong magnetic field than the magnetic field generated by the first excitation voltage.

  The plurality of sensors 40 on the sensor substrate 38 generate an induced current corresponding to the strength of the magnetic field from the electromagnetic pen 15, so that the touch surface 1 a is output from the output terminals 43 and 44 of the sensor substrate 38. The current signal having two values corresponding to the pressing force of the pen tip portion 18 of the electromagnetic pen 15 can be output to the input key determination circuit.

  Therefore, this liquid crystal display device displays two types of touch input keys on each of the plurality of touch areas 8, and one of the two types of touch input keys is pressed by the pressing force of the pen tip portion 18 of the electromagnetic pen 15. The touch input to be selected can be performed, or the display color of the touch input key and the thickness of lines such as numbers and symbols can be changed according to the pressing force of the pen tip portion 18.

  In the electromagnetic induction touch panel of the above embodiment, the drive unit 20 of the electromagnetic pen 15 is selectively applied to the magnetic field generating coil 19 with two values of excitation current corresponding to the pressing amount of the movable shaft 17. The driving unit 20 selectively supplies excitation currents having three or more values to the magnetic field generating coil 19 in accordance with the pushing amount of the movable shaft 17. The excitation current of a single value may be supplied to the magnetic field generating coil 19 regardless of the pushing amount of the movable shaft 17.

  The electromagnetic pen 15 of the above embodiment includes a rod-shaped movable shaft 17 as a movable member, and the movable member has a pen tip at the tip, and the pen tip is penned by a spring force. Other members may be used as long as they are pressed in the direction protruding from the front end of the body and are pushed toward the pen body by pressing the pen tip against the touch surface.

  Further, in the electromagnetic pen 15 of the above embodiment, the magnetic field generating coil 19 is wound around a coil winding portion 17a formed on the distal end side of the movable shaft 17, and the magnetic field generating coil 19 is another member. It may be wound around the tip of the pen body.

  In the electromagnetic induction type touch panel of the above-described embodiment, the plurality of sensors 40 on the sensor substrate 38 are formed in a spiral shape. However, the sensor 40 is not limited to the spiral shape and includes a single loop line. A plurality of loop lines with different diagonal lengths or diameters formed in a square shape or a circular ring shape having a cut-off part in a part or a part thereof are arranged concentrically with each cut-off part corresponding to each other, You may form in the shape where one cut-off ends of these loop lines and the other cut-off ends were connected in parallel, respectively.

  Further, the sensor substrate 38 of the above embodiment is provided with a plurality of sensors 40 corresponding to each of the plurality of touch regions 8 of the liquid crystal display element 1. The plurality of elongated row direction sensors respectively corresponding to the touch areas 8 of each row of the display element 1 are insulated from the plurality of elongated column direction sensors respectively corresponding to the touch areas 8 of each column of the liquid crystal display element 1. In this case, the touch area by the electromagnetic pen 15, that is, the touched input key can be determined based on the output of each row direction sensor and each column direction sensor.

  Furthermore, the sensor substrate 38 has one end of the plurality of sensors 40 connected to a ground terminal, and the other end of the plurality of sensors 40 is connected to a plurality of output terminals provided corresponding to each sensor 40, respectively. A connected configuration may be used, and by doing so, a touch area (touched input key) by the electromagnetic pen 15 can be determined directly from the outputs of the plurality of output terminals.

  The liquid crystal display device of the above embodiment includes the transmissive liquid crystal display element 1, and the liquid crystal display element allows a magnetic field to pass through the inner surface or the outer surface of the substrate opposite to the observation side. Even in a reflective display element provided with a reflective film made of a non-ferromagnetic metal such as aluminum, a transmissive display portion and a reflective display portion are provided for each pixel by providing the reflective film corresponding to a part of each pixel. The formed transmissive / reflective display element may be used, and when the reflective display element is provided, the surface light source 9 is not necessary.

  Furthermore, this invention can be applied not only to a liquid crystal display device provided with an electromagnetic induction type touch panel, but also to an electromagnetic induction type touch panel provided with a touch surface other than a liquid crystal display element.

1 is an exploded perspective view of a liquid crystal display device including an electromagnetic induction type touch panel according to an embodiment of the present invention. Sectional drawing of the electromagnetic pen which comprises the said electromagnetic induction type touch panel. The expanded sectional view by the side of the drive part arrangement of the above-mentioned electromagnetic pen. Sectional drawing which follows the IV-IV line of FIG. The expanded sectional view when the movable shaft by the side of the drive part arrangement of the electromagnetic pen is pushed halfway. The expanded sectional view when the movable shaft by the side of the drive part of the electromagnetic pen is pushed to the pushing limit. The circuit diagram when the movable axis | shaft of the said electromagnetic pen protrudes to the protrusion limit. The circuit diagram when the movable shaft of the said electromagnetic pen is pushed in halfway. The circuit diagram when the movable axis | shaft of the said electromagnetic pen is pushed in to the pushing limit. The top view of the sensor substrate which comprises the said electromagnetic induction type touch panel. The expanded sectional view of one sensor part of the sensor board.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display element, 1a ... Touch surface, 7 ... Screen area, 8 ... Touch area | region, 9 ... Surface light source, 10 ... Light guide plate, 12 ... Light emitting element, 15 ... Electromagnetic pen, 16 ... Pen trunk, 17 ... Movable axis , 18 ... nib member, 19 ... magnetic field generating coil, 20 ... drive unit, 21 ... movable contact member, 25, 26 ... fixed contact member, 27a, 27b ... button type battery, 28a, 28b ... + electrode battery terminal, 29a , 29b ...- electrode battery terminal, 31 ... alternating current generation circuit, 38 ... sensor substrate, 40 ... sensor.

Claims (3)

A touch surface having a plurality of predetermined touch areas;
A pen body, and a pen body which is provided in the pen body so as to be movable in a length direction thereof, and has a pen point part for touching the touch surface at a tip, and the pen point part is a tip of the pen body by a spring force. A movable member that is pressed in a direction projecting from the touch surface and is pushed toward the pen body by pressing the pen tip against the touch surface, a magnetic field generating coil provided near the tip of the pen body, An electromagnetic pen for touch input that is provided in a pen body and includes a drive unit that supplies an excitation current to the magnetic field generating coil by pressing the movable member;
A plurality of sensors that are arranged on the rear side of the touch surface and that are opposed to the touch surface and that generate an induced current by receiving a magnetic field from the electromagnetic pen are provided corresponding to the plurality of touch areas, respectively. Touch area detection sensor substrate,
An electromagnetic induction type touch panel comprising:   The electromagnetic induction touch panel according to claim 1, wherein the driving unit of the electromagnetic pen selectively supplies a plurality of values of excitation current to the magnetic field generating coil in accordance with the amount of pressing of the movable member. A screen area in which a plurality of pixels for controlling light transmission are arranged in a matrix form, an image display, and a key display for displaying touch input keys in a plurality of predetermined touch areas in the screen area, respectively. A liquid crystal display element to perform;
A pen body, a pen body which is provided in the pen body so as to be movable in the length direction thereof, and has a pen tip part for touching a touch surface formed by a surface on the observation side of the liquid crystal display element at the tip, and a spring force The pen tip portion is pressed in a direction protruding from the tip of the pen barrel, and a movable member that is pushed toward the pen barrel by pressing the pen tip against the touch surface, and a tip in the pen barrel A magnetic field generating coil provided in the vicinity; and a touch input electromagnetic pen comprising a drive unit that is provided in the pen body and supplies an excitation current to the magnetic field generating coil by pressing the movable member;
The liquid crystal display element is disposed on the opposite side to the viewing side, and an induced current is generated by receiving a magnetic field from the electromagnetic pen on a surface facing the liquid crystal display element, corresponding to each of the plurality of touch areas. A sensor substrate for detecting a touch area provided with a plurality of sensors;
A liquid crystal display device comprising an electromagnetic induction type touch panel.

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