JP2005327259A - Instruction location detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an instruction location detection device which can be used even in an image display device without using cathode rays. <P>SOLUTION: The device is provided with a display part 1, a receiving part 2 and a control part 3. The display part 1 transmits coordinate information toward the outside of the display part 1. The receiving part 2 receives the coordinate information transmitted from the display part 1 and transmits it to the control part 3. The control part 3 generates display information based on the coordinate information received by the receiving part 2. Furthermore, the control part 3 transmits the display information to the display part 1. The display part 1 displays the display information received from the control part 3 by superimposing it on image information. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pointing position detection device.

  Conventionally, in a CRT (cathode ray tube), a position detection device named a light pen or a light gun is used. In this apparatus, the position on the screen indicated by the detection apparatus can be detected by detecting the irradiation position of the cathode ray. Therefore, (1) drawing can be performed by tracing the screen with a light pen, and (2) a specific screen display can be performed by directing the light gun to one place on the screen.

  However, there is a problem that the conventional position detection device as described above cannot be used for an image display device that does not use a cathode ray (for example, LCD, DLP, plasma display, etc.).

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a pointing position detection device that can be used even in an image display device that does not use a cathode ray.

  The pointing position detection apparatus according to the present invention includes a display unit, a receiving unit, and a control unit. The display unit is configured to transmit coordinate information to the outside of the display unit. Furthermore, the display unit is configured to display display information received from the control unit. The receiving unit is configured to receive the coordinate information transmitted from the display unit and send the coordinate information to the control unit. The control unit is configured to generate the display information based on the coordinate information received by the receiving unit and send the display information to the display unit.

  The coordinate information is transmitted to the outside by a carrier wave, for example. The carrier wave is, for example, light. The light is, for example, visible light.

  It is also possible to transmit the coordinate information by a visible light pulse having a time width that is difficult to visually recognize.

  The coordinate information is digital information indicating coordinates, for example. The digital information is represented by, for example, a gray code.

  The coordinate information may be information indicating a position on a line in a plurality of directions.

  The display information is information for displaying a position corresponding to the coordinate information, for example.

  The display information may be information that displays substantially continuous positions corresponding to a plurality of the coordinate information.

  The display information may be image information selected corresponding to the coordinate information.

  The display unit may be configured to transmit the coordinate information after transmitting a synchronization signal. The control unit may be configured to generate the display information based on the coordinate information received after receiving the synchronization signal.

  The display unit may be configured to superimpose and display the display information on image information to be displayed on the display unit.

  The display unit may be configured to superimpose and display the coordinate information on image information to be displayed on the display unit.

  The display unit may be configured to transmit coordinate information in a region narrower than a region targeted by the coordinate information after transmitting the coordinate information.

  The display unit may include a light emitting unit, a rotating body, a driving unit, and an angle detection unit. The light emitting unit may be configured to irradiate light to the rotating body. The rotating body may be configured to generate the coordinate information by modulating light from the light emitting unit according to a rotation angle of the rotating body. The drive unit may be configured to rotate the rotating body. The angle detection unit may be configured to detect a rotation angle of the rotating body.

The pointing position detection method according to the present invention includes the following steps:
(1) a step of transmitting coordinate information to the outside of the display unit;
(2) receiving the coordinate information transmitted from the display unit;
(3) A step of generating display information based on the received coordinate information and transmitting the display information to the display unit. (4) A step of the display unit displaying the received display information.

  According to the pointing position detection apparatus of the present invention, the pointing position can be detected even in an image display apparatus that does not use a cathode ray. Furthermore, a display corresponding to the designated position can be performed.

(Configuration of the first embodiment)
Hereinafter, a first embodiment of a pointing position detection device according to the present invention will be described with reference to FIGS. The detection apparatus according to the present embodiment includes a display unit 1, a reception unit 2, and a control unit 3.

  The display unit 1 includes a display 11, a driver 12, a processing unit 13, an image memory 14, a cursor memory 15, and a coordinate information generation unit 16.

  The display device 11 is an appropriate display such as a DLP, a plasma display, or an LCD.

  The driver 12 sends a signal for driving the display unit 11 sent from the processing unit 13 to the display unit 11.

  The processing unit 13 superimposes signals from the image memory 14, the cursor memory 15, and the coordinate information generation unit 16 and sends them to the driver.

  The image memory 14 is a part that stores image signals to be displayed on the display 11.

  The cursor memory 15 is a part that accumulates display information (cursor information) generated by the control unit 3.

  In this embodiment, the coordinate information generation unit 16 generates a digital signal indicating coordinates for each pixel and sends the digital signal to the processing unit 13.

  With such a configuration, the display unit 1 is configured to transmit coordinate information toward the outside of the display unit 1. The coordinate information is transmitted by being superimposed on the optical signal from the display unit 1. Further, the display unit 1 is configured to display display information received from the control unit 3. Details of these display methods will be described in the description of operations described later.

  The receiving unit 2 is configured to receive the coordinate information transmitted from the display unit 1 and send it to the control unit 3. The receiver 2 having such a configuration can be configured by using an arbitrary element such as a light receiving element (for example, a photodiode) or an amplifier.

  The control unit 3 includes a coordinate calculation unit 31 and a display information generation unit 32. As shown in FIG. 2, the coordinate calculation unit 31 includes an amplifier 311, a comparator 312, a decoder 313, and a microcomputer 314.

The amplifier 311 amplifies the reception output from the reception unit 2 and sends it to the comparator 312. A threshold voltage T _th is supplied to the comparator 312. The comparator 312 supplies the output to the decoder 313 when the output from the amplifier 311 exceeds the threshold voltage _Vth .

  The decoder 313 analyzes the coordinate signal received by the receiving unit 2 based on the output of the comparator 312. The function of the microcomputer 314 will be described later.

  The display information generation unit 32 is a part that generates display information corresponding to the acquired coordinate information (in this embodiment, cursor information at a position corresponding to the coordinates).

  Thereby, the control unit 3 is configured to generate display information based on the coordinate information received by the receiving unit 2 and further send the display information to the display unit 1.

(Operation of the first embodiment)
Next, the operation of the pointing position detection apparatus according to the first embodiment will be described along the flowchart shown in FIG.

(Step 3-1)
First, the coordinate information generating unit 16 of the display unit 1 generates coordinate information. An example of the coordinate information will be described with reference to FIGS. Assume that the coordinates on the screen of the display 11 are represented by (0, 0) to (n, m) (see FIG. 4). That is, it is assumed that the screen has m rows and n columns of pixels. At this time, the coordinate information is represented by a plurality of bit strings corresponding to the positions of the pixels. For example, 4 bits are allocated for each row and column. Then, coordinate information is represented by a total of 8 bits (see FIG. 5). Here, the coordinate information in this embodiment shall be produced | generated for every pixel. Of course, the region may be identified by attaching the same (or common characteristics) coordinate information to the group (region) of pixels.

  In this embodiment, a bit string for representing coordinate information is represented by a pulse string. The pulse width (length on the time axis) is preferably short enough to be invisible to the subject when the coordinate information is displayed on the display 11.

  The generated coordinate information is superimposed on the image information for each pixel in the processing unit 13 and sent to the display 11. Various methods for superimposing the coordinate information and the image information are conceivable. Here, an example thereof will be described with reference to FIGS.

  For example, it is assumed that image information is sent in a PWM pulse train. In this case, each pulse has a pulse width corresponding to the luminance. Coordinate information is inserted after elapse of a predetermined time from the rising time in each pulse. In FIG. 6, four types of pulses having widths w = 8, 4, 2, and 1 are shown as pulses indicating image information.

  For example, when the bit of the coordinate information is 1, the state of the pulse after a lapse of a predetermined time is reversed only for a short time (a pulse on which the coordinate information in FIG. 6 is superimposed (indicated by x in the figure)). See). In the pulse of w = 8, the bit is inverted in the middle. When the coordinate information bit is 0, it is not inverted. In this way, coordinate information can be superimposed on image information. In this case, as shown in FIG. 7, the width of the PWM pulse representing the original luminance is extended. However, this point is not particularly problematic if the width of each pulse is reduced as a whole.

  Furthermore, for example, if the relationship between the bit of the coordinate information and the pulse inversion is exchanged for each frame, the luminance becomes uniform as a whole, and the problem that the luminance changes depending on the coordinate information can be reduced.

(Step 3-2)
On the other hand, the coordinate information generation unit 16 sends a synchronization signal to the coordinate calculation unit 31 of the control unit 3 (see FIG. 1).

(Step 3-3)
The coordinate calculation unit 31 acquires the received coordinate information after receiving the synchronization signal (described later in step 3-6).

(Step 3-4)
The image information on which the coordinate information is superimposed is sent to the display device 11 via the driver 12 and displayed by the display device 11. Thereby, coordinate information can be transmitted toward the outside of the display unit 1. In this embodiment, coordinate information is conveyed by modulating an optical signal as a carrier wave. Although it does not specifically limit as a carrier wave, When using the indicator 11, it is preferable to set it as visible light.

(Step 3-5)
Next, the receiving unit 2 is directed to the screen displayed on the display 11. Then, the coordinate signal corresponding to the position to which the receiving unit 2 is directed is received by the receiving unit 2.

  The reception unit 2 sends a reception signal to the coordinate calculation unit 31 of the control unit 3.

(Step 3-6)
In the coordinate calculation unit 31, the amplifier 311 amplifies the received signal and sends it to the comparator 312. The comparator 312 sends an output signal to the decoder 313 when the input signal to the comparator 312 exceeds the threshold value _Vth . Thereby, the S / N ratio of the received signal can be improved. The decoder 313 decodes the coordinate signal based on the output signal from the comparator 312. The obtained coordinate signal is sent to the microcomputer 314. The microcomputer 314 sends the coordinate signal acquired after the synchronization signal to the display information generation unit 32.

(Step 3-7)
The display information generation unit 32 generates display information (cursor information in this example) and sends it to the cursor memory 15 (see FIG. 1). Thereafter, the display information is superimposed on the image information and the coordinate information in the processing unit 13 and sent to the driver 12.

(Step 3-8)
The display information superimposed on the image information and the coordinate information is displayed on the screen by the display 11. The display information is represented by, for example, lighting or blinking of the cursor at a position corresponding to the coordinate information.

  Thus, according to this embodiment, the position indicated by the receiving unit 2 can be detected and displayed on the display 11.

(Step 3-9)
Thereafter, when the position indicated by the receiving unit 2 changes (for example, the receiving unit 2 moves), the acquired coordinate information changes. In this case, the operations after step 3-5 are repeated. Therefore, continuous coordinate information can be obtained as the indicated position changes. Then, for example, information indicating a continuous position such as a line can be displayed as display information.

  In the present embodiment, it is preferable that the bit string indicating adjacent pixels is a gray code. The Gray code is a code in which bit strings indicating adjacent positions are different by 1 bit (see FIG. 8). FIG. 8 shows an example of a 2-bit column indicating a row.

  In this way, even when the receiving unit 2 moves before receiving the bit string indicating the coordinates of one pixel, there is an advantage that the acquired coordinates are close to the original coordinates. On the other hand, for example, if a bit string representing an adjacent pixel changes from 0111 to 1000, coordinates at a distant position are acquired due to a 1-bit reading error. On the other hand, when the Gray code is used, the position indicated by the acquired coordinates is adjacent to the original position even if there is a 1-bit reading error.

(Configuration of Second Embodiment)
Next, a pointing position detection apparatus according to a second embodiment of the present invention will be described with reference to FIGS. In the description of this embodiment, the components that are substantially the same as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted. In short, the apparatus of this embodiment transmits coordinate information in two different directions in a time division manner.

  In this embodiment, the driver 12 in the display unit 1 includes a control circuit 121, a trigger generation unit 122, an X driver 123, and a Y driver 124 (see FIG. 9). The trigger generation unit 122 generates a mode signal and a synchronization signal (indicated by a symbol TRG in FIG. 9) and sends the generated signal to the control circuit 121. The mode signal is either 0 or 1. The synchronization signal is also sent to the control unit 3. In the present embodiment, the synchronization signal is generated by the trigger generation unit 122 and is not generated by the coordinate information generation unit 16.

  The control circuit 121 sends operation signals to the X driver 123 and the Y driver 124 in accordance with the received mode signal. Detailed operation will be described later.

  Furthermore, in the second embodiment, a counter 316 and a threshold setting DA converter 317 are used instead of the decoder 313 in the coordinate calculation unit 31 (see FIG. 13). These operations will also be described later.

  In this embodiment, the receiving unit 2 includes a switch 21 (see FIG. 13). The switch 21 is designed to be turned on when the receiving unit 2 is pressed against the screen of the display unit 11. The microcomputer 314 operates when the switch 21 is ON.

(Operation of Second Embodiment)
In the apparatus of the second embodiment, when the mode signal output from the trigger generation unit 122 is 1, the control circuit 121 drives the X driver 123 and the Y driver 124 as shown in FIG. That is, the image signal is displayed on the display 11 by the X driver 123. On the other hand, as shown in the figure, after the synchronization signal TRG is generated, the Y driver 124 generates a pulse signal in each line from Y1 to Yn while shifting in the time direction. Such a pulse signal is referred to as a line select signal. In the second embodiment, the mode is held at 0 at the n-th frame (see FIG. 12).

  Assume that the receiving unit 2 receives a pulse signal in the i-th line Yi. Then, the comparator 312 compares the threshold voltage with the voltage of the reception pulse, and outputs the voltage to the counter 316 if the reception pulse voltage is high. The counter 316 that has received this output sends the output to the microcomputer 314. Here, the counter 316 starts operating after receiving the synchronization signal TRG generated by the trigger generation unit 122.

  The microcomputer 314 also receives a mode signal and a synchronization signal (see FIG. 13). As a result, based on the time from the time when the synchronization signal is generated to the time when the output from the counter 316 is received, the “coordinate on the Y-axis” is specified and the coordinates on the Y-axis are specified. Can be obtained.

  Next, in the (n + 1) th frame, the mode output from the trigger generation unit 122 is changed to 1 (see FIG. 12). Then, as shown in FIG. 11, the Y driver 124 displays the image signal on the display 11. On the other hand, in the X driver 123, after the synchronization signal TRG is generated, the pulse signals are generated in the respective lines X1 to Xn while being shifted in the time direction. In the second embodiment, the mode is held at 1 at the (n + 1) th frame. Note that n indicating the number of frames and n indicating the number of lines are irrelevant and can take different values.

  Thereby, the coordinate on the X-axis can be acquired as in the case of the Y-axis. In this way, if the mode is switched for each frame, the coordinate information can be transmitted continuously. Different positions can be detected by detecting different coordinate information.

  In the second embodiment, the microcomputer 314 operates when the switch 21 of the receiving unit 2 is in the ON state. Therefore, for example, the switch 21 is turned on by pressing the receiving unit 2 against the screen, and the coordinates in that state can be detected. Then, display information can be displayed at the position where the receiving unit 2 is pressed.

  Since other advantages are the same as those of the first embodiment, detailed description is omitted.

  In the first embodiment described above, XY coordinates are acquired in two frames, but it is also possible to acquire XY coordinates in one frame. In this case, an image signal is generated simultaneously in the X driver and the Y driver without using the line select signal shown in FIGS. However, in each driver, the pulse generation timing is shifted for each line (see FIG. 14). FIG. 14 shows an example of an image signal from the X driver. In this case, the coordinate signal is expressed by a minute time difference in the generation time of the image signal.

  In this case, the receiving unit 2 can detect the coordinates in the X and Y directions based on the timing of the received image signal.

  Furthermore, in the first embodiment, a coordinate signal that can express coordinates on the entire screen is generated, but a coordinate signal that expresses coordinates in a specific range region may be transmitted. For example, after a certain coordinate is acquired by the method of each embodiment described above, a coordinate signal with high resolution (that is, a fine mode) can be transmitted in a region near the coordinate (see FIG. 15). Fig.15 (a) is the figure which extracted a part of FIG. In FIG. 15B, the horizontal axis represents time, and the vertical axis represents lines such as Y1 and Y2. In FIG. 15B, the fine mode line is illustrated below the normal mode line. In the fine mode line, the pulse width is extended in the time direction. In this way, when the receiving unit 2 having the same time resolution is used, the position resolution can be improved.

  This point will be described in more detail with reference to FIG. The output of the receiving unit 2 in the normal mode is shown as “[Y2 upper] light receiving sensor A” in FIG. Here, normal mode pulses are output on lines Y1 and Y2. On the other hand, the output of the receiving unit 2 in the fine mode is shown as “light receiving sensor B placed between Y3 and Y4” in FIG. Here, fine mode pulses are output on lines Y3 and Y4. In the normal mode, the output voltage of the receiving unit 2 may not exceed the threshold value by only receiving light of one pixel. This is because there is noise and relative movement between the display unit 1 and the receiving unit 2. On the other hand, in the fine mode, since the light emission time per pixel is long, the output voltage of the receiving unit 2 exceeds the threshold value even if there is noise or relative movement between the display unit 1 and the receiving unit 2. Cheap. For this reason, in the fine mode, there is an advantage that it becomes easy to accurately identify the information (blink) for each pixel. Thereby, the detection accuracy of the designated position can be improved.

(Third embodiment)
Next, a pointing position detection apparatus according to a third embodiment of the present invention will be described with reference to FIGS. In the description of this embodiment, the components that are substantially the same as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted. In short, the apparatus of this embodiment is such that the display unit 1 is a DLP projector.

  The display unit 1 in the apparatus of the third embodiment includes an I / F unit 111, a light emitting unit 112, a rotating body 113, a projection lens 114, a drive unit 115, and an angle detection unit 116 (FIG. 16).

  The I / F unit 111 receives a video signal from the driver 12 (see FIG. 1) and sends it to the light emitting unit 112 and the driving unit 115. The I / F unit 111 is configured to send the rotation angle of the rotating body 113 detected by the angle detection unit 116 to the outside. In this embodiment, the rotation angle of the rotating body 113 is sent to the microcomputer 314 in the coordinate calculation unit 3 of the control unit 3.

  The light emitting unit 112 is a DMD (digital mirror device), for example, and is configured to irradiate the rotating body 113 with light according to the video signal.

  The rotating body 113 is configured to generate image information and coordinate information by modulating the light from the light emitting unit 112 according to the rotation angle of the rotating body 113. More specifically, the rotating body 113 is formed in a disk shape (see FIG. 18). The rotating body 113 is formed with three slits 113a, 113b, 113c penetrating in the thickness direction. These slits are spaced apart in the circumferential direction. In addition, a film (not shown) that transmits one of RGB colors is attached to these slits. Thereby, the rotator 113 can change the incident light to one of RGB colors according to which slit the light is transmitted. The color of light transmitted through the slits 113a to 113c is determined according to the rotation angle of the rotating body 113. Therefore, the rotating body 113 of this embodiment can modulate the light from the light emitting unit 112 according to the rotation angle.

  The projection lens 114 projects light transmitted through the rotating body 113 onto a screen at an appropriate magnification.

  The drive unit 115 is configured to rotate the rotating body 113 according to the video signal. The drive unit 115 can be configured by a control motor, for example.

  The configuration of the display 11 described above is common in DLP projectors.

  The angle detection unit 116 is configured to detect the rotation angle of the rotating body 113. Such an angle detection unit 116 can be configured using a rotary encoder or a tachometer.

  The apparatus according to the third embodiment has an advantage that the amount of information that can be sent to the display unit 1 per unit time increases because coordinate signals can be sent to the display unit 1 in three-dimensional RGB. Of course, the color space is not limited to RGB but may be other color spaces. In the present embodiment, the information placed in the three-dimensional RGB is transmitted by the display unit 11 in a time division manner.

  Further, in the apparatus according to the present embodiment, the luminance value and the information in the RGB space can be linked based on the luminance value received by the receiving unit 2 and the rotation angle detected by the angle detecting unit 116. Therefore, coordinate information in the RGB color space can be acquired based on the luminance value in the receiving unit 2. Such a calculation can be performed by the microcomputer 314 in the coordinate calculation unit 31 of the control unit 3, for example.

  Therefore, the light receiving element of this embodiment does not need to recognize the color, and only needs to recognize the luminance. Therefore, according to the present embodiment, there is an advantage that the component cost of the receiving unit 2 can be reduced.

In recent DLP projectors, in order to increase the apparent brightness, slits that transmit white light may be arranged between RGB slits. When such a projector is used as the display unit 1, it is preferable to measure the amount of received light using the following conversion formula.
R ′ = R + aW
G ′ = G + bW
B ′ = B + cW

However,
R, G, B, W: Measured amount at corresponding angle (correspondence between transmitted light color and angle is known)
a, b, c: Specific coefficients R ′, G ′, B ′ corresponding to the ratio of R, G, B, W in the rotating body: estimated luminance. By using R ′, G ′, and B ′ as the luminance, it is possible to support a projector that transmits white light.

  The information transmission system and method of the present invention are not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

  For example, each component described above may exist as a functional block, and may not exist as independent hardware. As a mounting method, hardware or computer software may be used. Furthermore, one functional element in the present invention may be realized by a set of a plurality of functional elements, and a plurality of functional elements in the present invention may be realized by one functional element.

  Moreover, the functional element may be arrange | positioned in the position physically separated. In this case, the functional elements may be connected by a network.

  For example, a personal computer monitor can be used as the display 1, a personal computer can be used as the control unit 3, and the receiving unit 2 can be connected to the personal computer using a connection means such as a USB. In addition, all or part of various data processing functions (calculation, storage, and transmission) in the display 1 may be executed on the personal computer side. Of course, necessary functions may be executed by distributed processing.

  Furthermore, in the embodiment, coordinate information on the XY axis is used as the coordinate information. However, the present invention is not limited to this, and any coordinate information that can specify a position on a line in two intersecting directions may be used. In short, the coordinate system is not limited as long as the coordinate information can specify the indicated position.

  Further, the display information is not limited to the cursor information, but may be other types of image information. For example, an arbitrary image can be generated or selected corresponding to the designated position and displayed. For example, in a computer game, it is generally preferable to use such display information.

  Further, the display information may be a pointer indicating a position. In this way, the apparatus of the above embodiment can be used instead of the laser pointer.

  The display unit 1 can also transmit information indicating whether the area is inside or outside. For example, in a shooting game, it can be determined from the information received by the receiving unit 2 from the display unit 1 whether the receiving unit 2 is pointing inside or outside. In this way, for example, on the condition that the receiving unit 2 is pointing in the target area, it is possible to control to display detailed coordinate information in the target area.

It is explanatory drawing which shows schematic structure of the pointing position detection apparatus which concerns on 1st Embodiment of this invention. It is a block diagram which shows the detailed structure of the control part in FIG. It is a flowchart for demonstrating operation | movement of the pointing position detection apparatus in FIG. It is explanatory drawing for demonstrating an example of the expression method of the coordinate in a pixel. It is explanatory drawing for demonstrating an example of coordinate information. It is explanatory drawing for demonstrating the method to superimpose coordinate information on image information. It is explanatory drawing for demonstrating the pulse width at the time of superimposing coordinate information on image information. It is explanatory drawing for demonstrating the example which expresses coordinate information by a Gray code. It is explanatory drawing for demonstrating the structure of the driver in 2nd Embodiment of this invention. It is explanatory drawing for demonstrating the coordinate information on the Y-axis in 2nd Embodiment. It is explanatory drawing for demonstrating the coordinate information on the X-axis in 2nd Embodiment. It is explanatory drawing for demonstrating the switching timing of the mode in 2nd Embodiment. It is explanatory drawing for demonstrating the structure of the control part in 2nd Embodiment. It is explanatory drawing for demonstrating the method to transmit XY coordinate by 1 frame. It is explanatory drawing for demonstrating the method to transmit XY coordinate in the area | region limited. It is explanatory drawing for demonstrating in detail the operation | movement of reception in a fine mode. It is a block diagram for demonstrating the structure of the indicator in 3rd Embodiment. It is explanatory drawing for demonstrating the structure of the rotary body in 3rd Embodiment, Comprising: It is the figure which looked at the rotary body from the front (left direction in FIG. 16).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Display part 11 Display 111 I / F part 112 Light emission part 113 Rotating body 113a, 113b, 113c Slit 114 Projection lens 115 Drive part 116 Angle detection part 12 Driver 121 Control circuit 122 Trigger generation part 123 X driver 124 Y driver 13 Processing Unit 14 Image memory 15 Memory for cursor 16 Coordinate information generation unit 2 Reception unit 21 Switch 3 Control unit 31 Coordinate calculation unit 311 Amplifier 312 Comparator 313 Decoder 314 Microcomputer 316 Counter 317 DA converter 32 Display information generation unit

Claims (17)

A display unit, a receiving unit, and a control unit;
The display unit is configured to transmit coordinate information toward the outside of the display unit, and the display unit is configured to display display information received from the control unit,
The receiving unit is configured to receive the coordinate information transmitted from the display unit and send it to the control unit,
The indicated position detecting device, wherein the control unit is configured to generate the display information based on the coordinate information received by the receiving unit and to send the display information to the display unit.   The pointing position detection apparatus according to claim 1, wherein the coordinate information is transmitted to the outside by a carrier wave.   The pointing position detection device according to claim 2, wherein the carrier wave is light.   The pointing position detection device according to claim 3, wherein the light is visible light.   5. The pointing position detection apparatus according to claim 4, wherein the coordinate information is transmitted by a visible light pulse having a time width that is difficult to visually recognize.   The pointing position detection apparatus according to claim 1, wherein the coordinate information is digital information indicating coordinates.   The pointed position detection apparatus according to claim 6, wherein the digital information is represented by a gray code.   The pointing position detection apparatus according to claim 1, wherein the coordinate information is information indicating a position on a line in a plurality of directions.   The pointing position detection apparatus according to claim 1, wherein the display information is information for displaying a position corresponding to the coordinate information.   The pointing position detection apparatus according to claim 1, wherein the display information is information that displays a substantially continuous position corresponding to the plurality of pieces of coordinate information.   The pointing position detection apparatus according to claim 1, wherein the display information is image information selected corresponding to the coordinate information.   The display unit is configured to transmit the coordinate information after transmitting a synchronization signal, and the control unit is configured to generate the display information based on the coordinate information received after receiving the synchronization signal; The pointing position detection device according to claim 1, wherein the pointing position detection device is a pointing device.   The indication position according to any one of claims 1 to 12, wherein the display unit is configured to display the display information superimposed on image information to be displayed on the display unit. Detection device.   The indicated position according to any one of claims 1 to 12, wherein the display unit is configured to display the coordinate information superimposed on image information to be displayed on the display unit. Detection device.   The said display part is the structure which transmits the coordinate information in the area | region narrower than the area | region where the said coordinate information is object after transmitting the said coordinate information, The any one of Claims 1-14 characterized by the above-mentioned. The pointing position detection apparatus according to the item. The display unit includes a light emitting unit, a rotating body, a drive unit, and an angle detection unit,
The light emitting unit is configured to irradiate light to the rotating body,
The rotating body is configured to generate the coordinate information by modulating light from the light emitting unit according to a rotation angle of the rotating body,
The drive unit is configured to rotate the rotating body,
The pointing position detection device according to any one of claims 1 to 15, wherein the angle detection unit is configured to detect a rotation angle of the rotating body. A pointing position detection method comprising the following steps:
(1) a step of transmitting coordinate information to the outside of the display unit;
(2) receiving the coordinate information transmitted from the display unit;
(3) A step of generating display information based on the received coordinate information and transmitting the display information to the display unit. (4) A step of the display unit displaying the received display information.

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