JP4556700B2 - Coordinate detection device - Google Patents

Description

  The present invention relates to a coordinate detection device for detecting the position of a coordinate instructed to contact on a display screen of various electronic terminal devices, for example.

  Conventionally, in order to detect the pen operation position on the display screen of various electronic terminal devices, a display-integrated coordinate detection device has been put into practical use. Generally, a touch panel using a resistive film method or an electrostatic induction method is used. Many are used.

  The resistance film type coordinate detection device alternately applies voltages in the X and Y directions to two resistance films and detects a coordinate position based on an output voltage from a contact position by a pen touch (for example, a patent) Reference 1).

The electrostatic induction type coordinate detection device incorporates a derivative such as an LC resonance circuit at the tip of the pen, and generates an induced voltage generated when the tip of the pen approaches or comes into contact with the detected plane. By detecting at a point, the coordinate position of the pen touch is detected (for example, refer to Patent Document 2).
JP 2003-223283 A JP 2002-290553 A

  However, in the conventional resistive film type coordinate detection device, when the user touches a specified point, for example, when the palm of the user holding the pen or other part hits the detected plane, the pen is accurately Coordinates could not be detected, and there was a problem of poor usability especially when a large touch panel was installed on a desk.

  Further, in the conventional electrostatic induction type coordinate detection device, the tip of the pen is generally thin and has no space, and there is a slight misalignment from the position in which the derivative is built-in. The actual designated point at the tip of the pen and the coordinate position detected according to the induced voltage due to the derivative may be different, which makes it difficult to perform precise position input accurately.

  The present invention has been made in view of the above problems, and is a display-integrated coordinate system that can accurately detect the coordinates of a designated point by a completely new system, not a resistive film system or an electrostatic induction system. An object is to provide a detection device.

The coordinate detection apparatus according to claim 1 of the present invention is a coordinate detection apparatus including a display panel, a display panel control unit that controls the display panel, and an object that contacts the display panel. The display panel is arranged in combination with each of the light emitting elements of infrared light arranged at a plurality of fixed positions of the display screen, and each of the plurality of light emitting elements, and according to the emission of infrared light from the light emitting elements, A light receiving element that receives reflected light reflected by an object that contacts the display screen corresponding to the arrangement position of the light emitting element, and the object is provided corresponding to a portion that contacts the display screen. In order to convert the reflected light reflected by the reflector and the reflected light reflected by the reflector into a pulsed optical signal corresponding to the command code to be input , Koman Comprising a liquid crystal shutter that is driven into a state of transmitting a state of shielding the light in accordance with the code, wherein the display panel controller, the display screen based on the light reception output of the light reflected by each of the plurality of light receiving elements Detecting means for detecting the position of an object in contact with the light receiving device, and command determining means for determining a command code input based on a signal pattern of a light reception output of reflected light from each of the plurality of light receiving elements. And

The coordinate detection device according to claim 2 of the present invention is the coordinate detection device according to claim 1, wherein, instead of the liquid crystal shutter, the rotation is arranged so that the outer peripheral portion crosses the front surface in the reflection direction of the reflector. And an encoder in which a slit is formed on the outer periphery of the disc within a timing range that should be in a transmission state in accordance with the command code.

The coordinate detection device according to claim 3 of the present invention is the coordinate detection device according to claim 1, wherein, instead of the liquid crystal shutter, the rotation is arranged so that the rotation path crosses the front surface in the reflection direction of the reflector. And a belt-type encoder having slits formed in a timing range in which the belt should be in a transmission state according to the command code.

A coordinate detection device according to a fourth aspect of the present invention is the coordinate detection device according to any one of the first to third aspects, wherein the light emitting element and the light receiving element combined with the light emitting element are: One set is arranged for each display pixel of the display screen.

According to the coordinate detection device of the present invention, it is possible to accurately detect the coordinates of a designated point by an object such as a pen by a completely new method that is neither a resistive film method nor an electrostatic induction method, and the reflected light on the object side. By switching between light shielding and transmission, it is possible to easily generate an optical signal having a pulse timing corresponding to the command code and input it to the light receiving element corresponding to the designated point on the display screen as command information.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram showing a configuration of a display-integrated coordinate detection apparatus 10 according to a first embodiment of the present invention, where FIG. 1A is a perspective view showing an overall appearance configuration, and FIG. FIG. 4C is an enlarged plan view showing a part of the display input panel 11 extracted from a rectangular region, and FIG. 8C is an enlarged plan view showing one pixel 12 n of the display input panel 11 extracted.

  This display-integrated coordinate detection apparatus 10 has a color display function and a pen point detection function using a reflective sensor in each of the pixels 121, 122, 123,.

  Each of the pixels 121, 122, 123,... Is divided into four regions, and a red light emitting element (R) which is a display element of R, G, B three primary colors for performing color display in three regions. ) 13r, a green light emitter (G) 13g, and a blue light emitter (B) 13b are arranged, and the pen tip detection unit 14 for detecting the pen tip of the pen P in the remaining one region includes a set of light emitting elements 14a. The light receiving element 14b is arranged.

  The pen tip P1 of the pen P is made of a material that reflects the light emission wavelength of the light emitting element 14a of the pen tip detection unit 14 well. For example, when the light emitting element 14a emits infrared light, this infrared It is composed of a material that can easily reflect only light.

  The entire surface of the display input panel 11 of the coordinate detection device 10 is covered with a protective layer 15 made of a transparent acrylic plate or a thin glass plate.

  FIG. 2 is a diagram showing a pen tip detection operation in the display input panel 11 of the coordinate detection device 10. FIG. 2A shows the corresponding pixel 12 n in a state where the pen tip P 1 is away from the display input panel 11. FIG. 5B is a diagram illustrating the operation, and FIG. 5B is a diagram illustrating the operation of the corresponding pixel 12n in a state where the pen tip P1 is in contact with the display input panel 11.

  As shown in FIG. 2A, in a state where the pen tip P1 is away from the surface of the display input panel 11, the light Xa emitted from the light emitting element 14a of the pen tip detector 14 in the corresponding pixel 12n is Since the light passes through the protective layer 15 and is diffused in the space above, the reflected light Xb is not received on the light receiving element 14b side, and the pen tip P1 is not detected.

  On the other hand, as shown in FIG. 2B, when the pen tip P1 comes close to and comes into contact with the surface of the display input panel 11, the light Xa emitted from the light emitting element 14a of the pen tip detector 14 in the corresponding pixel 12n is obtained. The reflected light Xb is reflected by the reflecting material of the pen tip P1 in contact and is received by the light receiving element 14b, so that the pen tip detector 14 of the pixel 12n causes the pen P to display on the display input panel 11. The designated coordinate position is detected.

  In this case, when the pen P abuts on the display input panel 11, the pen tip P1 is crushed and deformed in accordance with the contact with the panel 11 surface, and the contact area of the pen tip P1 with the panel 11 surface is increased. Therefore, the reflected light Xb from the pen tip P1 can be reliably obtained by the pen tip detector 14 of the corresponding pixel 12n.

  FIG. 3 is a diagram showing a display input circuit for performing display control on the display input panel 11 of the coordinate detection device and coordinate detection control of the input position.

  The light emitting element 14a of the pen tip detection unit 14 in each of the pixels 121, 122, 123,... Of the display input panel 11 is always driven to emit light when the power is on, and is reflected by the pen tip P1 according to the light emission Xa. When the light Xb is received by the light receiving element 14b, this received light signal is immediately latched by a latch circuit 211, 212, 213,... Provided for each pixel 121, 122, 123,. . The pen tip detection signals latched by the latch circuits 211, 212, 213,... Are read out to the shift registers 221, 222, 223,. , ... are stored in correspondence with each other.

  The pen tip detection signal corresponding to each pixel stored in the shift registers 221, 222, 223,... Is read out at a preset timing by the control unit (CPU / LSI) 24 and then cleared to detect the pen tip. A coordinate position on the display input panel 11 corresponding to the pixel position from which the signal is obtained is detected.

  On the other hand, the red light emitter (R) 13r, the green light emitter (G) 13g, and the blue light emitter (B) 13b, which are display elements for each of the pixels 121, 122, 123,..., Are controlled by the control unit (CPU / LSI). In accordance with the display data written in the display memory 25 by 24, the display driver 26 emits light.

  The control unit (CPU / LSI) 24 controls the operation of each unit in accordance with an input (coordinate detection) control program and a display control program stored in advance in a memory (for processing) 27.

  Then, the control unit (CPU / LSI) 24 corresponds, for example, to the display element (R) 13r, (corresponding to the coordinate position designated by the pen tip P1 detected in response to the pen input operation on the display input panel 11. G) Display control or erasure control of the pen input trajectory is performed by driving the 13g and (B) 13b to turn on or off.

  FIG. 4 is a diagram showing various modifications of the pen tip P1 of the pen P used in the coordinate detection device.

  As described above, the pen tip P1 of the pen P for designating a desired position on the display input panel 11 is associated with the contact of the pen tip P1 with the panel 11 as shown in FIG. As shown in FIG. 4 (B), in addition to those having elasticity that flattenes and flattenes along the surface of the panel 11, the contact inclined in advance according to the average operation angle of the pen P with respect to the display input panel 11 by the user. As shown in FIG. 4C, the pen nib P1a having a surface moves in the shape of an arrow x as it comes into contact with the surface of the display input panel 11 in a ball shape partially having a flat surface, thereby obtaining surface contact. As shown in FIG. 4D, any of the pen tip P1b and the mirror ball-like pen tip P1c formed with a hexagonal facet adjacent to the entire spherical surface may be used. Note that any pen nib P1, P1a, P1b, P1c is made of a material that well reflects the emission wavelength of the light emitting element 14a of the pen nib detector 14.

  Therefore, according to the display-integrated coordinate detection apparatus 10 of the first embodiment having the above-described configuration, R, G, and B primary colors are displayed for each of the pixels 121, 122, 123, ... on the display input panel (display screen) 11. A nib detecting unit provided with a red light emitter (R) 13r, a green light emitter (G) 13g, and a blue light emitter (B) 13b, which are elements, and a combination of an infrared light emitting element 14a and a light receiving element 14b. 14 adjacent to each other, and when the pen tip P1 comes into contact with the surface of the panel 11 in response to a pen operation on the display screen by the user, the pen tip detection unit 14 of the pixel 12n at the contact position of the pen tip P1. The infrared light Xa emitted from the light emitting element 14a is reflected by the pen tip P1, and the reflected light Xb is received by the light receiving element 14b of the same detecting unit 14, thereby receiving light at the pen tip detecting unit 14 of the corresponding pixel 12n. Trust Since the pen input detection position is detected and the pen input coordinate position on the display input panel (display screen) 11 is detected, the user's palm, which is a conventional resistive film system, comes into contact with the panel surface. This eliminates the problem of misdetecting the coordinate position of unnecessary parts, or the problem of deviation between the actual pen operation position and the detected coordinate position, which was the electrostatic induction method. It is possible to detect the nib P1 and detect the coordinate position of the designated point.

  Further, according to the display-integrated coordinate detection apparatus 10 of the first embodiment having the above-described configuration, the pen tip detection signal obtained by the pen tip detection unit 14 of the pixel 12n corresponding to the pen operation designated point is latched as data. Since the coordinate position of the designated point which is held in the circuit 21n and then read out to the shift register 22n and detected by the pen tip is determined, the input locus accompanying the continuous pen operation on the display input panel (display screen) 11 is determined. The coordinate position can be reliably detected without omission.

  Note that the coordinate detection apparatus 10 of the first embodiment detects the coordinate position of the designated point associated with the operation of the pen P on the display input panel 11, and executes any control corresponding to this coordinate position. Is configured to be program-controlled according to prior user settings, such as designated point display, designated point deletion, or command execution according to the icon displayed at the designated point. As described in the coordinate detection apparatus 10 of the embodiment, the reflected light Xb at the designated point is converted into a pulsed reflected light signal corresponding to the command code selected according to the user operation by the pen tip P2 having the reflective shutter function. .., And by detecting the coordinate position in accordance with the pen tip detection signal for each pixel 121, 122, 123,... And decoding the pulse code of the detection signal in accordance with the command code. Alternatively, the control may be executed.

(Second Embodiment)
FIG. 5 is a diagram showing a pen tip detection operation in the display input panel 11 of the display-integrated coordinate detection apparatus 10 according to the second embodiment of the present invention, and FIG. 5 (A) shows a pen tip having a reflective shutter function. The figure which shows operation | movement of the corresponding | compatible pixel 12n in the state which P2 has left | separated from the display input panel 11, The same figure (B) is a response | compatibility in the state in which the pen point P2 provided with the reflective shutter function contact | abutted to the display input panel 11 It is a figure which shows operation | movement of the pixel 12n.

  That is, in the coordinate detection apparatus 10 of the second embodiment, as the pen tip P2 of the pen P that is directly operated by the user, for example, as shown in FIG. A pen tip P1b is used which can move and obtain surface contact as indicated by an arrow x as it comes into contact with the surface of the display input panel 11, and becomes a contact surface of the pen tip P2 (P1b) with the panel 11 surface. A mirror plate 31 for reflecting infrared light incident on the plane portion and a liquid crystal shutter 32 for shielding or transmitting the light reflected by the mirror plate 31 over the entire mirror surface are provided for the plane portion.

  As shown in FIG. 5A, in a state where the pen tip P2 is away from the surface of the display input panel 11, the light Xa emitted from the light emitting element 14a of the pen tip detector 14 in the corresponding pixel 12n is Since the light passes through the protective layer 15 and is diffused in the space above, it is received on the light receiving element 14b side as the reflected light Xb regardless of whether the mirror plate 31 is shielded or transmitted by the liquid crystal shutter 32. In addition, the pen tip P2 is not detected.

  On the other hand, as shown in FIG. 5B, when the pen tip P2 comes close to and comes into contact with the surface of the display input panel 11, the light Xa emitted from the light emitting element 14a of the pen tip detector 14 in the corresponding pixel 12n is obtained. When the liquid crystal shutter 32 of the pen tip P2 in contact is transmitted, the light is reflected by the mirror plate 31, and the reflected light Xb is received by the light receiving element 14b, whereby the pen tip of the pixel 12n is detected. The designated coordinate position on the display input panel 11 by the pen P is detected by the unit 14.

  Since the liquid crystal shutter 32 is controlled to be shielded / transmitted in accordance with a display command code to be described later, the reflected light Xb is received by the light receiving element 14b when the pen tip detection unit 14 detects the pen tip P2. The pattern, that is, the signal pattern of the pen tip detection signal is a pulse-like signal pattern in which the timing of light reception and non-light reception is combined corresponding to the command code.

  FIG. 6 is a cross-sectional view showing the configuration of the mirror plate 31 and the liquid crystal shutter 32 provided on the pen tip P2 of the pen P in the coordinate detection device 10 of the second embodiment.

  The liquid crystal shutter 32 has a structure in which the liquid crystal layer 32 a is sandwiched between upper and lower electrode substrates 32 b 1 and 32 b 2 and polarizing plates 32 c 1 and 32 c 2, and is disposed so as to overlap the mirror layer 31 a on the surface of the mirror plate 31.

  The liquid crystal shutter 32 is driven by a liquid crystal driving circuit (not shown) built in the pen P and a battery power source, and drive control involving switching between light shielding and transmission in the liquid crystal shutter 32 is provided on the side surface of the pen P, for example. The display command code selected by operating the display command switching button (not shown) operated by the user is performed.

  For example, as the display command in the coordinate detection apparatus 10 of the present embodiment, the pen input designated point display on the display input panel 11 is turned on (command “0”), the display is turned off (command “1”), and the display color is changed (command). “2”) and display emphasis (command “3”) are prepared.

  The liquid crystal shutter 32 is controlled to be shielded from light or transmitted in accordance with an 8-bit command code having a 1, 0 array that is different for each of the commands “0”, “1”, “2”, and “3”.

  FIG. 7 is a timing chart showing a signal pattern of a pen tip detection signal corresponding to a display command code in a pen tip detection state detected and received by the pen tip detection unit 14 of the coordinate detection device 10 of the second embodiment. is there.

  That is, the pen is generated by a pulsed liquid crystal drive signal corresponding to an 8-bit (b0 to b7) command code in which the start bit (ST) is “0” (light shielding) and the stop bit (SP) is “1” (transparent). When the pen tip P2 is in contact with the surface of the display input panel 11 by light-shielding / transmitting the liquid crystal shutter 32 provided at the tip P2, a light reception signal (pen tip) of the reflected light Xb obtained by the pen tip detector 14 is used. Like the liquid crystal drive signal, the detection signal is a pulse-like signal that changes between V0 and V1 corresponding to the command code.

  FIG. 8 is a diagram showing a display input circuit for performing display control on the display input panel 11 and coordinate detection control of the input position of the coordinate detection apparatus 10 of the second embodiment.

  In the display input circuit of the coordinate detection apparatus 10 of the second embodiment, the light reception signal (pen tip detection signal) output from the light receiving element 14b provided in the pen tip detection unit 14 for each pixel 12n is an amplifier circuit 14c. A sampling control signal is supplied to the amplifier circuit 14c from the control unit (CPU / LSI) 24 at a predetermined interval, and the amplifier circuit 14c is amplified and stabilized in synchronization with the sample control signal. The pen tip detection signal is read by the control unit (CPU / LSI) 24.

  The control unit (CPU / LSI) 24 detects the coordinate position corresponding to the pixel 12n based on the pen tip detection signal read from the amplifier output circuit 14c for each pixel 12n of the display input panel 11, and A command code corresponding to a change of 1 or 0 in the previous detection signal is decoded and analyzed, and display control is executed according to the analyzed display command.

  FIG. 9 is a flowchart showing a coordinate detection process performed by the coordinate detection apparatus 10 according to the second embodiment.

  That is, in the state where the light emission driving of the light emitting element 14a in the pen tip detection unit 14 for each pixel 121, 122, 123,... Of the display input panel 11 is started (step S1), for example, as shown in FIG. As described above, when the pen tip P2 of the pen P is brought into contact with any pixel position on the display input panel 11, the light Xa from the light emitting element 14a at the position of the pixel 12n is liquid crystal provided on the pen tip P2. Reflected by the mirror plate 31 at the timing when the shutter 32 is driven to transmit, the reflected light Xb is received by the light receiving element 14b at the position of the pixel 12n (step S2).

  Here, the liquid crystal shutter 32 provided at the pen tip P2 of the pen P is light-shielded / transmitted in response to an arbitrary display command “0” to “3” selected by a user operation. Therefore, the light reception signal (pen point detection signal) of the reflected light Xb received by the light receiving element 14b also has a signal pattern corresponding to the command code (see, for example, FIG. 7).

  When the light reception signal (pen point detection signal) from the light receiving element 14b in the pixel 12n designated by the pen point P2 is input to the control unit (CPU / LSI) 24 via the amplifier output circuit 14c, the light reception signal ( The coordinates of the designated point on the display input panel 11 are detected and determined corresponding to the pixel 12n with the light receiving element 14b from which the pen tip detection signal has been acquired (step S3).

  At the same time, the signal pattern of the received light signal (pen tip detection signal) input to the control unit (CPU / LSI) 24 is analyzed (step S4), and any command code of display commands “0” to “3” is analyzed. Is determined (steps S5 to S8).

  Then, a pen tip detection signal at the designated point coordinate position detected by the pen tip detection unit 14 of the pen input designated point and input to the control unit (CPU / LSI) 24 and detected and determined is as follows: For example, when it matches the display command “0”, the display elements 13r, 13g, 13b of the pixel 12n corresponding to the designated point coordinate position are driven to light according to the display data written in the display memory 25 (step S5 → S9). Thereby, drawing display corresponding to the movement locus of the pen P on the display input panel 11 can be performed.

  Further, the pen tip detection signal at the designated point coordinate position detected by the pen tip detection unit 14 at the pen input designated point 14 and input to the control unit (CPU / LSI) 24 and detected is For example, when it coincides with the display command “1”, the display elements 13r, 13g, 13b of the pixel 12n corresponding to the designated point coordinate position are driven to be turned off (steps S6 → S10). As a result, display erasure corresponding to the movement path of the pen P on the display input panel 11 can be performed.

  Further, the pen tip detection signal at the designated point coordinate position detected by the pen tip detection unit 14 at the pen input designated point 14 and input to the control unit (CPU / LSI) 24 and detected is For example, when it matches the display command “2”, the display color of the display element 13r, 13g, 13b of the pixel 12n corresponding to the designated point coordinate position is changed and driven to light (step S7 → S11). As a result, the display color can be changed corresponding to the movement locus of the pen P on the display input panel 11.

  Furthermore, a pen tip detection signal at the designated point coordinate position detected by the pen tip detection unit 14 at the pen input designated point 14 and input to the control unit (CPU / LSI) 24 and detected is For example, when it coincides with the display command “3”, the display luminance (light quantity) by the display elements 13r, 13g, 13b of the pixel 12n corresponding to the designated point coordinate position is increased and driven to be emphasized (step S8 → S12). Thereby, display emphasis corresponding to the movement locus of the pen P on the display input panel 11 can be performed.

  Therefore, according to the display-integrated coordinate detection apparatus 10 of the second embodiment having the above-described configuration, the pen tip detection comprising the light emitting element 14a and the light receiving element 14b for each of the pixels 121, 122, 123,. A portion 14 is provided, and the coordinate position of the designated point by the pen tip P2 is detected by reflecting the light Xa from the light emitting element 14a to the pen tip P2 in contact with the surface of the panel 11 and receiving the reflected light Xb by the light receiving element 14b. At the same time, a liquid crystal shutter 32 is disposed on the front surface of the mirror plate 31 of the pen tip P2 of the pen P. When the panel surface is operated, the liquid crystal shutter 32 is driven to switch between shading / transmission in accordance with a display command code. The received light signal (pen nib detection signal) of the reflected light Xb is converted into a pulse-like signal of 0, 1 change corresponding to the display command code, and the content of the command for the specified point Since so also obtained, not only by operating enter any designated point with the pen P, for example it may also enter a command of display control with respect to the input operation specified point.

  In the coordinate detection device 10 of the second embodiment, the liquid crystal shutter 32 provided on the front surface of the mirror plate 31 of the pen tip P2 is displayed, for example, as a command code for display in accordance with the pen input operation on the display input panel 11. The light receiving signal (pen tip detection signal) of the reflected light Xb to the pen tip detection unit 14 of the pixel 12n corresponding to the pen operation position is changed to a pulse shape corresponding to the command code. As shown in FIG. 10, the pen tip P2 corresponds to a predetermined command code on the outer periphery of the disc 41 that rotates (R) about the rotation axis O as shown in FIG. Thus, the encoder 40 is provided with slits 41a, 41b,... That allow both the light emission Xa and the reflected light Xb to pass through in a pulsed form.

  Then, by rotating (R) the encoder 40 in accordance with the pen input operation on the display input panel 11, a light reception signal (b) of the reflected light Xb to the pen tip detection unit 14 of the pixel 12n corresponding to the pen operation position ( The pen tip detection signal) may be converted into a pulse signal pattern corresponding to the command code.

  FIG. 10 is a diagram showing an encoder 40 that is built in the pen tip P2 of the pen P and generates the pulsed reflected light signal (Xb) corresponding to the command code in the coordinate detection apparatus 10 of the second embodiment. is there.

  In addition, as shown in FIG. 11, the roller 51 that rotates (R) around the rotation axis O in the pen tip P2 and the mirror plate 31 is disposed on the innermost side of the tip of the pen tip P2. A belt 53 is mounted between the lens and guide 52 and a long / short pulse in which the light emission Xa and the reflected light Xb between the display input panel 11 and the belt 53 are associated with a predetermined command code. A belt-type encoder 50 provided with slits 53a, 53b,.

  Then, by rotating (R) the belt 53 in accordance with the pen input operation on the display input panel 11, a light reception signal (b) of the reflected light Xb to the pen tip detection unit 14 of the pixel 12n corresponding to the pen operation position ( The pen tip detection signal) may be converted into a pulse signal pattern corresponding to the command code.

  FIG. 11 shows a belt-type encoder 50 that is built in the pen tip P2 of the pen P and generates a pulsed reflected light signal (Xb) corresponding to the command code in the coordinate detection apparatus 10 of the second embodiment. FIG.

  Further, in the coordinate detection device of the first embodiment, the surface of the pen tip P1 of the pen P itself is used, and in the coordinate detection device of the second embodiment, the mirror plate 31 incorporated in the pen tip P2 of the pen P is used. , The light Xa emitted by the light emitting element 14a of the pen tip detector 14 provided for each of the pixels 121, 122, 123,... Of the display input panel 11 is reflected, and the reflected light Xb is received by the light receiving element 14b. The coordinate position of the designated point by the pen P is detected, but the pen tip P3 of the pen P is used as the reflective paint as will be described in the coordinate detection device 10 (see FIG. 12) of the third embodiment. 61 is configured such that light Xa emitted from the light emitting element 14a of the pen tip detection unit 14 is reflected by the reflective paint 61 drawn directly on the display input panel 11 with the pen tip P3, and the reflected light Xb is reflected. Received The optical element 14b may receive light and detect the coordinate position of the designated point by the pen P.

(Third embodiment)
FIG. 12 is a diagram showing a pen input designated point detection operation in the display input panel 11 of the display-integrated coordinate detection apparatus 10 according to the third embodiment of the present invention, and FIG. The figure which shows operation | movement of the corresponding pixel 12n in the state away from the input panel 11, The same figure (B) shows operation | movement of the corresponding pixel 12n in the state drawn on the display input panel 11 with the reflective paint 61 of the pen point P3. FIG.

  As shown in FIG. 12A, in a state where the pen tip P3 is away from the surface of the display input panel 11, the light Xa emitted from the light emitting element 14a of the pen tip detector 14 in the corresponding pixel 12n is Since the light passes through the protective layer 15 and is diffused in the space above, the reflected light Xb is not received on the light receiving element 14b side, and the pen tip P3 is not detected.

  On the other hand, as shown in FIG. 12B, when the pen tip P3 is brought into contact with the surface of the display input panel 11 and drawing with the reflective paint 61 is performed, the light emitting element 14a of the pen tip detector 14 in the corresponding pixel 12n. The light Xa emitted from the light is reflected by the reflective paint 61 adhered by the drawing, and the reflected light Xb is received by the light receiving element 14b, so that the pen tip detection unit 14 of the pixel 12n displays by the pen P. A drawing designated point or a coordinate position of a drawing locus on the input panel 11 is detected.

  The reflective paint 61 is, for example, a paint that easily reflects the infrared light Xa from the light emitting element 14 a and a paint that hardly reflects the display light H from the display element 13.

  The reflective paint 61 attached on the display input panel 11 can be easily erased using a cloth or the like.

  Therefore, according to the display-integrated coordinate detection apparatus 10 of the third embodiment having the above-described configuration, the pen tip detection comprising the light emitting element 14a and the light receiving element 14b for each of the pixels 121, 122, 123,. The portion 14 is provided, and the light Xa from the light emitting element 14a is reflected by the reflective paint 61 attached and drawn on the surface of the panel 11 by the pen tip P3, and the reflected light Xb is received by the light receiving element 14b to receive the pen tip P3. Since the coordinate position of the drawing designated point or the drawing trajectory is detected by the user's palm, which is a conventional resistive film method, the coordinate position of the unnecessary portion is erroneously detected by contacting the panel surface, Alternatively, there is no problem of deviation between the actual pen operation position and the detected coordinate position, which has been the electrostatic induction method, and the pen tip P3 is used accurately and reliably. Detecting the fixed point it is possible to detect the coordinate position.

  Note that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention at the stage of implementation. Further, each of the embodiments includes inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in each embodiment or some constituent features are combined, the problems described in the column of the problem to be solved by the invention can be solved. When the effects described in the column of the effect of the invention can be obtained, a configuration in which these constituent elements are deleted or combined can be extracted as an invention.

1A and 1B are diagrams showing a configuration of a display-integrated coordinate detection apparatus 10 according to a first embodiment of the present invention, in which FIG. 1A is a perspective view showing an overall appearance configuration, and FIG. 1B is a display input panel 11; FIG. 4C is an enlarged plan view showing one pixel 12n of the display input panel 11 extracted and shown. FIG. 8 is a diagram illustrating a pen tip detection operation in the display input panel 11 of the coordinate detection device 10, and FIG. 9A illustrates an operation of the corresponding pixel 12 n in a state where the pen tip P 1 is away from the display input panel 11. FIG. 7B is a diagram showing the operation of the corresponding pixel 12n in a state where the pen tip P1 is in contact with the display input panel 11. The figure which shows the display input circuit for performing the display control with respect to the display input panel 11 of the said coordinate detection apparatus, and the coordinate detection control of an input position. The figure which shows the various modifications of the pen point P1 of the pen P used with the said coordinate detection apparatus. It is a figure which shows the pen tip detection operation | movement in the display input panel 11 of the display integrated coordinate detection apparatus 10 which concerns on 2nd Embodiment of this invention, The figure (A) is a pen tip P2 provided with the reflective shutter function. The figure which shows operation | movement of the corresponding pixel 12n in the state away from the panel 11, The same figure (B) is operation | movement of the corresponding pixel 12n in the state which the pen point P2 provided with the reflective shutter function contact | abutted to the display input panel 11 FIG. Sectional drawing which shows the structure of the mirror board 31 and the liquid-crystal shutter 32 which were provided in the pen point P2 of the pen P in the coordinate detection apparatus 10 of the said 2nd Embodiment. The timing chart which shows the signal pattern of the nib detection signal corresponding to the command code for a display in the nib detection state by which the nib detection part 14 of the coordinate detection apparatus 10 of the said 2nd embodiment received light detection. The figure which shows the display input circuit for performing the display control with respect to the display input panel 11 of the coordinate detection apparatus 10 of the said 2nd Embodiment, and the coordinate detection control of an input position. The flowchart which shows the coordinate detection process by the coordinate detection apparatus 10 of the said 2nd Embodiment. The figure which shows the encoder 40 for producing | generating the pulse-shaped reflected light signal (Xb) corresponding to a command code incorporated in the pen point P2 of the pen P in the coordinate detection apparatus 10 of the said 2nd Embodiment. The figure which shows the belt-type encoder 50 for producing | generating the pulse-form reflected light signal (Xb) corresponding to a command code incorporated in the pen point P2 of the pen P in the coordinate detection apparatus 10 of the said 2nd Embodiment. It is a figure which shows the detection operation | movement of the pen input designated point in the display input panel 11 of the display integrated coordinate detection apparatus 10 which concerns on 3rd Embodiment of this invention, and the same figure (A) shows the pen tip P3 from the display input panel 11. The figure which shows operation | movement of the corresponding pixel 12n in the separated state, The figure (B) is a figure which shows operation | movement of the corresponding pixel 12n in the state drawn on the display input panel 11 with the reflective paint 61 of the pen point P3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Coordinate detection apparatus 11 ... Display input panel 12n ... Pixel 13 ... Display element 13r ... Red light-emitting body (R)
13g ... Green light emitter (G)
13b ... Blue light emitter (B)
DESCRIPTION OF SYMBOLS 14 ... Pen tip detection part 14a ... Light emitting element 14b ... Light receiving element 15 ... Panel protective layer 21n ... Latch circuit 22n ... Shift register 24 ... Control part (CPU / LSI)
25 ... display memory 26 ... display driver 27 ... memory (for processing)
DESCRIPTION OF SYMBOLS 31 ... Mirror plate 32 ... Liquid crystal shutter 40 ... Encoder 41 ... Disc 41a, 41b, ... Disc slit 50 ... Belt type encoder 51 ... Roller 52 ... Lens and guide 53 ... Belt 53a, 53b, ... Belt slit 61 ... Reflective paint Xa ... Light emission Xb ... Reflected light P ... Pen P1 ... Pen tip (first embodiment)
P2 ... nib (second embodiment)
P3 ... nib (third embodiment)

Claims (4)

A coordinate detection apparatus including a display panel, a display panel control unit that controls the display panel, and an object that contacts the display panel,
The display panel is
An infrared light emitting element arranged at a plurality of fixed positions on the display screen;
Reflected light that is arranged in combination with each of the plurality of light emitting elements and is reflected by an object that touches the display screen corresponding to the arrangement position of the light emitting elements in response to infrared light emission from the light emitting elements. A light receiving element for receiving light ,
The object is
A reflector that reflects infrared light provided corresponding to a portion in contact with the display screen;
A state in which light is shielded according to the command code in order to convert the reflected light reflected by the reflector into a pulsed optical signal corresponding to the command code to be input, disposed in front of the reflector in the reflection direction And a liquid crystal shutter that is driven in a transmitting state,
The display panel control unit
Detecting means for detecting a position of an object in contact with the display screen based on the light receiving output of the light reflected by each of the plurality of light receiving elements,
Command determination means for determining an input command code based on a signal pattern of a light reception output of reflected light by each of the plurality of light receiving elements;
A coordinate detection apparatus comprising: 2. The coordinate detection apparatus according to claim 1, further comprising a rotating disc arranged so that the outer peripheral portion thereof crosses the front surface in the reflection direction of the reflector instead of the liquid crystal shutter, and the outer peripheral portion of the disc is provided with a rotating disc. A coordinate detection apparatus comprising an encoder having a slit formed in a timing range to be transmissive according to the command code. The coordinate detection device according to claim 1, further comprising a rotating belt disposed so that a rotation path thereof traverses the front surface in the reflection direction of the reflector, instead of the liquid crystal shutter, and the command code for the belt. A coordinate detection apparatus comprising a belt-type encoder in which slits are formed within a timing range in which a transmission state is to be obtained. The coordinate detection according to any one of claims 1 to 3 , wherein one set of the light emitting element and the light receiving element combined with the light emitting element is arranged for each display pixel of the display screen. apparatus.

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