JP3579096B2 - Display device - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a display device having a pointer for inputting an operation or the like to an image displayed on a screen using light, and more particularly to a display device capable of performing an operation or the like with a plurality of pointers simultaneously.
[0002]
[Prior art]
In a computer system having a display device, as a means for receiving an instruction for operating an image displayed on the display device, a hand or other object is brought into direct contact with a display screen (screen) of the display device to perform an operation. There are those that give instructions. Such an indicating means according to the related art includes a touch panel and a stylus pen. In these methods, the instructor needs to operate while touching the screen of the display with a finger or the like, and when viewing the screen from a place away from the screen, such as a large display device, It is inconvenient to specify a position on the screen in this way.
[0003]
Therefore, as a device for indicating a position on a screen as a display screen in a large display device from a place away from the screen, a device described in Japanese Patent Application Laid-Open No. H5-150753, "Light beam projection type image display device" There is. This display device is a rear projection type large display device in which a projector for displaying an image on a screen is provided on the back of the screen. In this apparatus, a device incorporating a light emitting element for outputting infrared laser light is used as a pointer for indicating a position on a screen. The position where the infrared laser beam output from the pointer hits the screen is detected by a sensor provided on the back of the screen. Then, the input position of the user is identified from the position. Since the infrared rays are invisible, the position can be confirmed by displaying an image at the identified position.
[0004]
However, in this device, it is assumed that only one user gives an instruction on the screen, and a case where a plurality of people simultaneously hold a pointer and indicate a plurality of positions on the screen is not considered. . In this case, the position specified by one user cannot be distinguished from the position specified by another user. For this reason, there is a problem that the position is erroneously identified and an instruction different from the user's intention is performed. Therefore, a plurality of persons cannot use the pointer at the same time.
[0005]
A pointer for solving this problem is described in JP-A-5-224636, entitled "Method and Apparatus for Interacting with Computer-Output Projected Images". This device uses a plurality of pointers that emit infrared or visible light. The identification of the plurality of pointers is performed by modulating the infrared or visible light at different frequencies (frequencies of 35 kHz or less) into rectangular waves of different frequencies. When detecting infrared light or visible light, it is possible to distinguish between pointers by using a band-pass filter according to the modulation frequency.
[0006]
[Problems to be solved by the invention]
In the above prior art, each of the pointers needs to have a modulator for modulating the output light so that the output light from the plurality of pointers can be distinguished.
[0007]
A first object of the present invention is to provide a display device that does not have a modulation device and that allows a plurality of users to specify positions simultaneously with a pointer.
[0008]
By the way, in the case of a front projection type large display device, both the light from the projector and the light from the pointer are reflected on the front surface of the screen and enter the sensor for detecting the projection position of the pointer. Therefore, when the light from the pointer and the light from the projector have the same property as light, such as when the light has the same color or the same intensity, the position of the pointer cannot be recognized. Even in the case of a rear projection type large display device, the same problem as described above may occur if the light from the projector reflected from the rear surface of the screen is large due to poor transmittance of the screen.
[0009]
A second object of the invention is to provide a modulator if the light emerging from the projector and the light emerging from the pointer can be in the same state, and both light can enter the device for measuring the position of the pointer. Instead, an object of the present invention is to provide a display device capable of distinguishing both lights.
[0010]
[Means for Solving the Problems]
In order to achieve the first object, a screen on which an image is displayed, display means for displaying the image by projecting light on the screen, and position designation for designating a position on the screen Means, the position designating means, for differentiating at least one of a color of light, an intensity of light, and a polarization state of light, light for designating the position, the light of the screen, A plurality of pointers for projecting from the front onto the screen; a camera for receiving the plurality of lights projected on the screen by the plurality of pointers; and a position identification for identifying a position designated by the pointer by the received lights. The means and the received light are based on the fact that at least one of the color, the light intensity, and the polarization state of the light is different from each other. There are, whether the light projected by one of the pointer of the plurality of pointers, in which was to have a pointer identifying means for identifying for each of the identified location.
[0011]
In order to achieve the second object, a screen on which an image is displayed, display means for displaying light by projecting light in one polarization state onto the screen, and a position on the screen are designated. And position designation means for the, the position designation means, the screen, at least including light in a different polarization state than the light projected by the display means, of the color and intensity of the light included A plurality of pointers for projecting light for designating the position, different from at least one of the positions, from the front of the screen; and a polarized light for selectively transmitting light in a different polarization state from the light projected by the display means. Selecting means, a camera for receiving the polarized light selected by the polarization selecting means, and a position designated by the pointer by the received light. The light received from the light projected on the screen by the location identification means and the plurality of pointers is based on the fact that at least one of light color and light intensity is different from each other, Pointer identifying means for identifying, for each of the identified positions, the light projected by any of the pointers.
[0012]
[Action]
The plurality of pointers project light having different characteristics for each of the pointers. The camera receives light reflected on the screen of a large display. The position identification means performs image processing on the image to detect a plurality of input positions. Further, the pointer identifying means distinguishes a plurality of input positions on the screen for each pointer based on the color, intensity, or polarization state of light for each pointer. According to the above operation, the input position can be identified for each pointer even when a plurality of users simultaneously input with a plurality of pointers.
[0013]
In order to distinguish the color of light, for example, a light emitting diode of a different emission color may be provided for each pointer. In order to distinguish the light intensity, for example, the light emitting diode may emit light at a different intensity for each pointer. Further, in order to distinguish the polarization state of light, for example, a different polarizing plate is provided for each pointer on the front surface of the light emitting diode so as to emit different polarization for each pointer, and light is output through this polarizing plate. What should be done. As described above, since the plurality of pointers are distinguished from each other based on the color, intensity, or polarization state of light, a plurality of pointers can be identified with a pointer having a simple configuration without the need for a modulation device.
[0014]
In addition, light emitted from the display means is light in one polarization state, and light containing different polarization states is output from the pointer, and the light output from the display means is input to the camera by the polarization selection means. Not to be. Thus, the light from the display means and the light from the pointer can be distinguished without providing a modulation device, and the position of the pointer can be correctly recognized.
[0015]
【Example】
First Embodiment A display device according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram of a display device. This device is a rear projection display device that has a projection unit that displays an image on the screen on the back of the transmission screen, and that allows the user to view the image from the front of the screen and give an instruction using a pointer. In the following, a case where there are two pointers will be described, but the present invention is not limited to this. This display device includes pointers 101 and 102 and a computer system that performs processing according to the input. The computer system includes a control unit 106 for controlling the entire system, a screen 103 as a display surface, and a screen 103 including projection points 1011, 1021 provided by pointers 101, 102 provided on the back of the screen 103 and reflected on the back of the screen 103. A camera 105 for photographing the entire back of the camera, an input detection unit 107 for detecting a user's input position from a video photographed by the camera 105, and a display unit 108 for converting information to be displayed from the control unit 106 into analog RGB signals. A projection unit 104 that projects an image on a screen 103 based on an analog RGB signal from the display unit 108; and a bus 109 that connects the control unit 106, the input detection unit 107, and the display unit 108.
[0016]
The input detection unit 107 receives the plurality of lights projected on the screen 103 by the plurality of pointers 101 and 102, identifies the projected positions, and based on the fact that the colors of the lights are different from each other. Has a function of identifying which of the plurality of pointers 101 and 102 is the light projected by the pointer.
[0017]
FIG. 13 shows the hardware configuration of the computer system. The computer system includes a CPU 131, a main memory 132, a display unit 108, a projection unit 104, a hard disk 134, an input / output control unit 135, and a camera 105. The control unit 106 is realized by the CPU 131 and the main memory 132, and the input detection unit 107 is realized by the CPU 131, the main memory 132, and the input / output control unit 135.
[0018]
The main storage 132 stores the processing programs of the control unit 106, the input detection unit 107, and the display unit 108 executed by the CPU 131 at the time of execution.
[0019]
The hard disk 134 stores information on the position specified by the pointers 101 and 102 and identified by the input detection unit 107, pointer identification information (pointer type), and the like. Further, processing programs of the control unit 106, the input detection unit 107, and the display unit 108 executed by the CPU 131 are stored, and are transferred to the main storage when these processing programs are executed.
[0020]
The display unit 108 receives a drawing command for generating an image to be displayed on the screen 103 from the CPU 131, generates an RGB signal based on the drawing command, and outputs the signal to the projection unit 104. FIG. 16 shows an internal configuration of the display unit 106. The display unit 106 includes a drawing unit 1061, a frame memory 1062, and an RGB signal generator 1063. The drawing unit 1061 obtains data corresponding to the figure in accordance with the drawing command received from the control unit 106, and stores the data in the frame memory 1062. The RGB signal generator 1063 converts the bitmap information in the frame memory 1062 into an RGB signal. For example, when displaying a straight line, the control unit 106 outputs to the display unit 106 a command to draw a straight line with the coordinates of the start point and the end point. The drawing unit 1061 refers to the coordinates from the control unit 106 and generates a straight line on the frame memory 1062. The RGB signal generation unit 1063 scans the frame memory 1062 at regular intervals to generate an RGB signal.
[0021]
The input / output control unit 135 receives an instruction from the CPU 131, converts the analog RGB signal from the camera 105 from analog to digital at a timing described later, and sends the obtained digital data to the main storage 132. The main memory 132 stores the digital data.
[0022]
Each component of the display device will be described with reference to FIG. Each of the pointers 101 and 102 has a light-emitting element (light-emitting diode or laser diode) that outputs visible light, and outputs light having a different wavelength for each of the pointers 101 and 102. FIG. 14 shows the configuration of the pointers 101 and 102. Each of the pointers 101 and 102 includes a light emitting diode 141, a switch 142 for turning on / off the light emitting diode 141, and a battery 143.
[0023]
The screen 103 is of a transmissive type as described above, and includes, for example, a Fresnel lens that refracts the light projected by the projection unit 104 from the back of the screen toward the front of the screen, and a diffusion surface.
[0024]
The projection unit 104 is a CRT projection type using a CRT (cathode ray tube) as a light source, uses three visible light lasers that output RGB respectively as a light source, and directly intensifies a laser beam output from the laser with a video signal. Any of a laser projection type for modulation and a liquid crystal projection type using a color filter using liquid crystal may be used.
[0025]
The camera 105 arranged behind the screen 103 is arranged so that the entire screen 103 can be photographed. If the distance between the screen 103 and the camera 105 cannot be maintained, the optical path is lengthened by using a reflecting mirror, or a wide-angle lens is used as a lens so that the camera 105 can take an image of the entire screen 103. The camera 105 outputs the captured image of the screen 103 as a video signal.
[0026]
The camera 105 and the projection unit 104 may be operated with synchronization, or may be operated without synchronization. When the operation is performed in synchronization, it is preferable that the camera 105 captures an image during the vertical retrace period of the projection unit 104. In this way, even if the light from the projection unit 104 enters the camera 105, the light from the projection 104 and the light from the pointers 101 and 102 can be easily distinguished.
[0027]
A principle for identifying a pointer in the present embodiment will be described. The user operates the pointers 101 and 102 for projecting light of different wavelengths to project light on the screen 103. As shown in FIG. 1, on the back side (back side) of the screen 103, projection points 1011 and 1021 of colors corresponding to the pointers 101 and 102 appear at positions indicated by the pointers 101 and 102. When this is viewed from behind the screen 103, the input position can be detected by the position of the projection points 1011 and 1021 for each of the pointers 101 and 102, and the pointers 101 and 102 can be detected by the colors of the projection points 1011 and 1021. Can be distinguished.
[0028]
Note that the colors of the projection points 1011 and 1021 may coincide with the colors of the displayed image. However, there is no problem in this embodiment for the following reasons. In the case of a rear projection type display device as in this embodiment, an image is projected on the screen 103 from the back, and light from the pointers 101 and 102 is projected from the front of the screen 103. Since the screen 103 according to the present embodiment has a property of transmitting incident light, the light from the pointers 101 and 102 mainly enters the camera 105 and is reflected by the screen 103 and enters the camera 105. Is small, and the colors of the projection points 1011 and 1021 and the colors of the image are rarely confused.
[0029]
Next, the input detection unit 107 that performs this identification processing will be described. The input detection unit 107 identifies a user's input based on the video captured by the camera 105. The image captured by the camera 105 is a camera image 110 obtained by capturing the entire screen 103 as illustrated. The camera 105 converts the captured camera image 110 into an analog RGB signal and sends it to the input detection unit 107. The input detection unit 107 samples the analog RGB signal sent from the camera 105 for one frame at a predetermined timing.
[0030]
There are the following two methods for sampling timing, and either method may be used.
[0031]
1. Perform sampling at regular intervals
This is a method in which the input detection unit 107 determines a sampling cycle at a time longer than a time required for performing predetermined processing such as identification of an input position and a pointer type on one frame of image data. For example, the input detection unit 107 determines to perform sampling every 20 milliseconds.
[0032]
2. Do not sample at regular intervals
When the input detection unit 107 completes predetermined processing such as identification of an input position and a pointer type for one frame of image data, the input detection unit 107 immediately samples an RGB signal from the camera 104.
[0033]
When one frame of the video from the camera 105 is sampled, it is next checked whether or not there are projection points 1011 and 1021 in the video, and it is determined whether or not a user input has been made.
[0034]
Incidentally, the input detection unit 107 needs to detect the input position and the event type. Here, the input position and the event type are as follows.
[0035]
Taking a mouse, which is a typical input device, as an example, the input position is the position of the cursor on the display screen that moves when the mouse is moved. The event type indicates the type of the user's instruction, and is, for example, a request for a specific display / a request for erasing a specific display. In the case of a mouse, the event type is identified when a mouse button is pressed (button down), when the button is released (button up), or the like. In the present embodiment, the following input method is adopted in order to specify the input position and input the event type using the pointers 101 and 102.
[0036]
The input position is a position where the user projects light on the screen 103 with light from the pointers 101 and 102.
[0037]
Regarding the event type, by turning on the switch 142 of the pointers 101 and 102, when the user starts projection at a certain position on the screen 103, it is determined that an input corresponding to a mouse button down has been made at that position. I do. Further, in a state where the switches of the pointers 101 and 102 are turned on (in a projected state), the projection position of the pointers 101 and 102 is moved to a position desired by the user, and then the switch 142 is turned off at that position. Thus, it is determined that the input corresponding to the mouse button up has been performed. When the button-down is defined as described above, until the pointers 101 and 102 are projected for the first time, since the projection position is unknown, the user may perform a button-down at an incorrect position, or there may be agricultural policy. However, in this embodiment, since the menu at the projection position where the button is raised is selected, there is no mistake in selecting the menu.
[0038]
Note that if the button-down is performed twice consecutively as in the case of double-clicking the mouse, the button-down will not be interpreted as a button-down even if the button is turned on once at an incorrect position. Menu selection is invalidated. As a result, only the menu at the projection position where the button is down is selected.
[0039]
Further, the input detection unit 107 also outputs a pointer type (a unique number for identifying each pointer). In order to provide an environment in which a plurality of people can perform input simultaneously, when a plurality of users have pointers and perform input simultaneously, the input detection unit 107 sets a plurality of input devices (pointers) to be simultaneously input. Is necessary to be distinguished from each other.
[0040]
In order to detect the input position, the event type, and the pointer type, the input detection unit 107 first detects the input position and the pointer type simultaneously after sampling the camera image, and then detects the event type.
[0041]
The operation of the input detection unit 107 will be described with reference to the processing flow of FIG.
[0042]
Step 201
The camera 105 converts the image 110 showing the entire screen into RGB signals and sends the RGB signals to the input detection unit 107. The input detection unit 107 samples this signal. As the sampling order, the scanning lines constituting one frame are sequentially sampled from top to bottom. One scanning line is sampled sequentially from left to right. The number of pixels on one scanning line at this time is M. By sampling, 8-bit data is created for each RGB component of each pixel with respect to one frame of the camera image 110 photographing the screen 103. This data is stored in the main storage 132.
[0043]
Step 202
Through the processing up to step 211 described below, the input detection unit 107 simultaneously checks the input position and the pointer type to detect the input information. After that, the event type is determined. In steps 202 to 207 of steps 202 to 211, it is checked whether or not there is a pointer in the sampling image for each pointer type. Hereinafter, a method of searching for a pointer that outputs red light (hereinafter, referred to as a red pointer) as a pointer type will be described. In order to check the red pointer, the input detection unit 107 searches the sampling image for the redest dot.
[0044]
In step 202, in order to detect the input position, a variable (maximum variable) for storing information on the color intensity of each pointer is initialized to zero. For example, in the case of red, the red maximum variable is set to 0.
[0045]
Step 203
Steps 204 to 207, which are lower processing steps of step 203, are executed on the sampled data for each pixel from the first pixel to the last pixel in one frame.
[0046]
Step 204
The input detection unit 107 checks the RGB values of each pixel in the same order as the sampling order, and determines whether the other component (GB) is 0 and the R component is larger than the red maximum variable. If a pixel is found, the process proceeds to step 205; otherwise, the process proceeds to step 204 for the next pixel.
[0047]
Step 205
From the pixel number (one consecutive number attached in the sampling order for the pixels in one frame) to the camera coordinates (P _x , P _y ) To win. The calculation at this time can be calculated by the following equation when the pixel is the N-th pixel.
[0048]
P _x = Mod (N, M), P _y = Integer (N / M) where integer is a function to be converted to an integer
These coordinates are coordinates in a coordinate system defined on the imaging surface of the camera 101, and this coordinate system is called a camera coordinate system. On the other hand, the position of the displayed image is managed in a coordinate system (screen coordinate system) for the pixels projected by the projection unit 104. Therefore, it is necessary to convert the position obtained in the camera coordinate system into a position in the screen coordinate system. The correspondence between the camera coordinate system and the screen coordinate system is determined by the positional relationship between the projection unit 104, the screen 103, and the camera 105. For this reason, the input detection unit 107 preliminarily calculates a coordinate conversion expression X = fX (Px, Py) and Y = fY (Px, Py) between the camera coordinate system (Px, Py) and the screen coordinate system (X, Y). I remember. Then, the position on the camera image obtained is converted into a position on the screen coordinate system in step 210 described later by this conversion formula.
[0049]
Step 206
The value of R of the pixel in step 205 is set as the red maximum variable.
[0050]
Step 207
The same processing as steps 204 to 206 is performed for the other pointer colors.
[0051]
By performing the above steps 204 to 207 for all pixels, the camera coordinates of the pixel having the maximum value of the color can be obtained for each color of the pointer.
[0052]
Step 208
Check whether the input position is detected for each color. If the value of the red maximum variable is 0, the process proceeds to step 209. If the value of the red maximum variable is not 0, it is determined that an input has been made at some point, and the process proceeds to steps 210 to 212 to output input information.
[0053]
Step 209
The input detection unit 107 determines that there is no input from red.
[0054]
Step 210
The position on the camera coordinates is converted to the screen coordinate system managed inside the computer. For this reason, the input detection unit 107 has a camera image system (P _x , P _y ) And the screen coordinate system (X, Y), X = X (P _x , P _y ), Y = Y (P _x , P _y ) Is stored, and the pointer position (P _x , P _y ) To the screen coordinate system.
[0055]
In this manner, the input position is detected based on the presence or absence of the RGB pattern determined for each light emission color of each pointer type, and the input position can be detected for each pointer type.
[0056]
Step 211
Check the event type. In this embodiment, the event type is detected based on a change in the light emission state of the pointers 101 and 102 indicating whether the pointer has started emitting light or whether the light emission has ended. For this reason, the input detection unit 107 stores the previous status information. Specifically, it is stored in the main memory 132. Here, the status information indicates three points: a projection position by the pointer, a color of the pointer, and a projection state. The projection state indicates a state of whether or not the projection is performed by the pointers 101 and 102. Also, “last time, current time” means the last sampling time and the current sampling time. Therefore, considering the number of frames, if the processing for one frame is shorter than the cycle of sending one frame from the camera, the previous time indicates one frame before. If the processing for one frame is longer than the period for sending one frame from the camera, the last time indicates two or more frames earlier.
[0057]
Each time the input detection unit 107 performs a process of detecting that an input has been performed by the above-described pointers 101 and 102, the input detection unit 107 compares the status information with the immediately preceding status information and uses the information as follows. Generate input information. This information is sent to the control unit 106. Here, the input information indicates three points of all the pointers: a projection position by the pointer, a color of the pointer, and an input state. The input state indicates a state of whether the button is down, the button is up, or moving.
[0058]
・ This time, the input was detected by the pointer and the previous time was also detected.
Regarding the input state, the control unit 106 transmits input information indicating that the previously detected pointer type is moving to the coordinate position detected this time.
[0059]
・ When the input was detected by the pointer this time and the previous time was not detected
Regarding the input state, the control unit 106 transmits input information that the previously detected pointer type has been button-down at the coordinate position detected this time.
[0060]
・ When the previous input was detected without detecting the input by the pointer this time
Regarding the input state, the control unit 106 transmits input information indicating that the currently detected pointer type has been button-up at the previous coordinate position.
[0061]
・ When the input was not detected by the pointer this time, and the previous time was not detected
Since there is no input from the pointer type to be processed, nothing is transmitted to the control unit 106.
[0062]
Step 212
The input information generated in step 211, for example, the detected pointer type (red), event type (button down), and event occurrence position (x, y) are sent to the control unit 106.
[0063]
Step 213
The same processing as steps 208 to 212 is performed for each light emission color of each pointer.
[0064]
In the above description, a color having only one color component of the three primary colors, such as red, has been described. However, the present invention is not limited to this, and the same applies to a color composed of two or three colors of RGB. Can be detected.
[0065]
In addition, color detection was performed for only one pixel. As a result of trial production, this method was confirmed to be sufficiently effective. Usually, a plurality of pixels having the maximum intensity are considered to be collected, so that the collection may be detected. This method is considered more reliable than detecting only one pixel.
[0066]
Since the screen is a large screen, the size of the projection point of the pointer may be too small, and the resolution may be insufficient when shooting with a camera. Was confirmed to be sufficiently detectable.
[0067]
The control unit 106 that has received the above input information from the input detection unit 107 executes a process according to the input information for each pointer. For example, when multiple menus are displayed on the screen and a button is pressed on any one of the menus on the screen, it is interpreted that the menu at the position where the button was raised is selected. , The process of opening the menu. As a result of this execution, data for generating an image for displaying the opened menu is sent to the display unit 108. At this time, the designated positions of the pointers 101 and 102 may fluctuate due to camera shake or the like. Therefore, in specifying the position of the menu, an allowable area is provided for each menu, and when the pointers 101 and 102 are within the allowable area of one menu, it is assumed that the menu is selected.
[0068]
The display unit 108 generates an analog RGB signal according to the data. The generated RGB signals are sent to the projection unit 104.
[0069]
The projection unit 104 projects light on the screen 103 according to the RGB signals.
[0070]
Here, a method of determining a conversion formula for converting the above-described position coordinates in the camera coordinate system into position coordinates in the screen coordinate system will be described. The correspondence between the two coordinate systems is determined by the positional relationship between the projection unit 104, the screen 103, and the camera 105. Since the positional relationship changes by moving the position of the screen or the like, the correspondence between the two coordinate systems is as follows. It is not always fixed. Therefore, it is necessary to determine a conversion equation when starting use of the display device.
[0071]
In this embodiment, two marks are displayed on the screen 103 in advance by the projection unit 104 on the screen 103, and the marks are pointed by one pointer, thereby converting between the camera coordinate system and the screen coordinate system. Determine the formula. This mark is displayed at two points on the screen 103 on a diagonal line. Then, a conversion formula is obtained by associating the coordinates of the two points in the camera coordinate system with the coordinates in the screen coordinate system.
[0072]
The screen coordinate system has (xy, xy) coordinates from (0, 0) to (1280, 1024). First, the control unit 106 displays the predetermined mark at a position (100, 100) on the screen coordinate system. The user looks at the mark reflected on the screen 103, projects light with a pointer on the mark, and stops emitting light on the mark. At the start of use, the input detection unit 107 stores the default conversion formulas, X = Px and Y = Py, and outputs the coordinates detected in the camera coordinate system to the control unit 106 using these formulas. The control unit 106 stores the detected coordinates as P1 (Px1, Py1). Next, the control unit 106 erases the previous mark and displays the same mark as at the previous time at the point (1000, 900). As before, the user looks at the mark reflected on the screen 103, projects light with the pointer on the mark, and stops emitting light on the mark. The input detection unit detects a pointing point on the camera coordinates, and outputs the coordinates to the control unit 106. The control unit 106 stores the detected coordinates as P2 (Px2, Py2).
[0073]
Next, the control unit 106 creates a conversion formula for converting the coordinates of the camera coordinate system into the coordinates of the screen coordinate system by linear conversion using the above two detected coordinates. That is, the coordinate values (Px1, Py1) of P1 and the coordinate values (Px2, Py2) of P2 are substituted for Px1, Py1, Px2, and Py2 in the following equations to obtain a conversion equation.
[0074]
X = ((1000-100) / (Px2-Px1)) * (Px-Px1) +100
Y = ((900-100) / (Py2-Py1)) * (Py-Py1) +100
This equation is a conversion equation for converting coordinates (Px, Py) in the camera coordinate system to coordinates (X, Y) in the screen coordinate system.
[0075]
As described above, according to the present embodiment, a plurality of users can input data independently by projecting a large screen with pointers having different emission colors. Further, since the pointer projects visible light on the screen, the color of visible light can be easily confirmed even when the projection unit of the display device is not operating.
[0076]
In the above-described embodiment, a plurality of pointers are distinguished by changing the RGB color (light frequency) to distinguish the pointer types. Since the above is a rear projection type, erroneous recognition does not occur even if the color of light from the projection unit and the color of light projected by the pointer are the same, but in the case of a front projection type, erroneous recognition may occur. Therefore, in the case of the front projection type, when the color of the light from the projection unit is limited, it is desirable to use a color different from the color of the light from the projection unit in the pointer.
[0077]
In addition to changing the color of the pointer, a method of distinguishing the pointer by changing the light intensity of each pointer is also conceivable. For example, when a plurality of red pointers having different light intensities are used, the input detection unit measures in advance the intensity range of the R component value for each pointer and stores the measured value. The input detection unit checks which of the strength ranges of the pointers the detected R component value belongs to, determines the type of the pointer, and identifies the input position for each pointer.
[0078]
Next, a second embodiment using this method will be described. In this embodiment, a plurality of pointers are distinguished by the intensity of light. The colors are all the same, and the case of red will be described as an example.
[0079]
FIG. 6 shows the configuration of the display device according to this embodiment. This embodiment is a rear projection type display device like the first embodiment. In this embodiment, the two red pointers 601 and 602 emit light of different brightness. The pointer 601 emits light that is stronger than the pointer 602. The camera 105 captures a camera image 110 including two red dots 6011 ′ and 6021 ′ having different intensities, and outputs the captured camera image 110 to the input detection unit 607 in the form of a digital signal. Considering the red component of the camera image 110 (represented by a value in the range of 0 to 255; the larger the value, the brighter), the points 6011 ′ and 6021 ′ illuminated by the light from the pointer become red Has a value greater than 0 for the component. On the other hand, most of the light projected from the projection unit 104 is transmitted to the front side of the screen by the transmission screen 103, and the light reflected by the screen 103 and entering the camera 105 is small. The red component is substantially zero for the camera image 110 in the portion where the light projected from the camera is not hit (the portion other than the points 6011 ′ and 6021 ′).
[0080]
Next, the operation of the input detection unit 607 will be described. The input detection unit 607 measures in advance the intensity of light at the points 6011 and 6021 irradiated by the pointers 601 and 602, and stores the measured intensity. As a measurement method, at the start of use, the control unit 106 makes a display on the screen 103 in which the pointers 601 and 602 are sequentially instructed to project the pointers 601 and 602 for each pointer. Upon seeing the display, the user turns on the pointer according to the display, and the image is captured by the camera 105. The strength of each of the pointers 601 and 602 at that time is stored in the hard disk 134. As a result of the measurement, when the light of the pointer 601 enters the camera 105, a pixel whose red component value is around 200 is detected, and when the light of the pointer 602 enters the camera 105, the pixel value of the red component is around 100. It is assumed that it is confirmed that a certain pixel is detected.
[0081]
When detecting the input positions of the pointers 601 and 602, the input detection unit 607 checks which pointer's intensity range the detected red component value is in, determines the type of pointer, and determines the input position of each pointer. Identify. That is, the input detection unit 607 examines the red component of the image from the camera 105, determines that the light is the light of the pointer 601 if it is between 150 and 255, and determines that the light is the light of the pointer 601 if it is between 50 and 150. Judge as light. Next, as in the first embodiment, the input detection unit 607 compares the current light emission state of the detected light from each of the pointers 601 and 602 with the previous light emission state to determine the event type. , And transmits the obtained input information to the control unit 106.
In order to make the light emission intensity of the pointer 601 and the pointer 602 different, in the pointer circuit of FIG. 14, a resistor is inserted in series between the light emitting diode 141 and the battery 143, and the magnitude of this resistance is determined by the pointer 601 and the pointer 602. What is necessary is just to make it different.
[0082]
Note that components common to the components shown in FIG. 6 and the components shown in FIG.
[0083]
As described above, according to the present embodiment, a plurality of users can simultaneously input operation instructions in a large screen display device that performs input using a pointer.
[0084]
In the first and second embodiments, the image of the projection point of the pointer, which is visible on the back side of the screen 103, is captured by the camera 105. At this time, most of the light projected from the projection unit 104 passes through the screen 103. However, when the transmittance of the screen is poor, a part of the projection light is reflected toward the back of the screen 103, and the image projected by the projection unit 104 on the screen 103 can be seen on the back of the screen. Therefore, as shown on the screen 103 in FIG. 2, on the screen 103, the light from the projection unit 104 and the light from the pointers 101 and 102 can be seen from the back. Accordingly, the camera 105 simultaneously receives the reflected light projected from the projection unit 104 and reflected on the screen 103 and the light projected from the pointer, and both lights are reflected at the same position on the screen, and If it is color or intensity, the input detection unit cannot recognize the position of the pointer. When both lights are reflected at different positions on the screen and have the same color or intensity, the input detection unit may erroneously recognize the position of the pointer. In a third embodiment described below, this problem is solved by using polarized light.
[0085]
A third embodiment of the present invention will be described. FIG. 2 shows the configuration of this embodiment. In the present embodiment, the projection unit 104 has, on the front surface thereof, a right polarizing plate 201 for projecting only clockwise polarized light (hereinafter referred to as right polarization) from the projection unit 104. The camera 105 has, on its front surface, a left polarizer 202 for preventing transmission of only clockwise polarized light. Details of the polarizing plates 201 and 202 will be described later.
[0086]
From the projection unit 104, only light having right polarization is projected by the right polarizing plate 201, and is projected on the screen 103. On the other hand, since the camera 105 is equipped with the left polarizer 202, light having only right-polarized light from the projection unit 104 reflected by the screen 103 is reflected by the left polarizer 202 on the front of the camera 105. It is cut and does not enter the camera 105. The light from the pointers 101, 102 typically has any polarization, including right polarization and left polarization (counterclockwise polarization). Therefore, the light from the pointers 101 and 102 passes through the screen 103 and enters the left polarizer 202 on the front of the camera 105. With the left polarizing plate 202, of the light from the pointers 101 and 102, light having left polarization passes through the left polarizing plate 202 and enters the camera 105. As a result, on the screen 103, there are an image 2011 from the projection unit 104 and projection points 1011 and 1021 by light from the pointers 101 and 102, while the camera image 203 has projection points from the pointers 101 and 102. There are only images 1011 ′ and 1021 ′.
[0087]
As described above, by attaching different polarizing plates 201 and 202 to the projection unit 104 and the camera 105, the light from the projection unit 104 does not enter the camera 105 as shown in the camera image 203 of FIG. Only light from the pointers 101 and 102 enters. Thus, the camera 105 can capture only the image of the pointer input by the user without unnecessary light. The input detection unit 107 can detect the input by the pointers 101 and 10 by inspecting the camera image 203 by the method described in the first embodiment.
Here, the configuration and operation of the polarizing plates 201 and 202 will be described with reference to FIGS. FIG. 7 shows a configuration of the right polarizing plate 201. The right polarizing plate 201 includes a linear polarizing plate 2015 that passes only linearly polarized light, and a quarter-wave plate 2016 that converts linearly polarized light to right polarized light. That is, out of the light 7141 emitted from the projection unit 104, only the linearly polarized light 7151 passes through the linearly polarizing plate 2015, and the linearly polarized light 7151 is changed to the right polarized light 7161 by the １ ／ wavelength plate 2016. Is projected.
[0088]
FIG. 8 shows a configuration of the left polarizing plate 202. The left polarizing plate 202 includes a quarter-wave plate 2026 that changes right polarized light into linear polarized light, and a linear polarizing plate 2025 whose transmission axis is arranged so as not to pass this linear polarized light. Here, the transmission axis is an axis unique to the linear polarizing plate 2025, and only linearly polarized light having a vibration surface in the same direction as the axial direction can transmit through the linear polarizing plate 2025. Light entering the quarter-wave plate 2026 includes right-polarized light 7161 exiting from the projection unit 104 and reflected by the screen 103, and light 7161 'containing polarized light in all directions from the pointers 101 and 102. The right-polarized light 7161 and the right-polarized light in the light 7161 ′ are changed by the quarter-wave plate 2026 into linearly-polarized light 7261 and light 7261 ′ containing linearly-polarized light. Since the vibration plane of the linearly polarized light is orthogonal to the transmission axis of the linearly polarizing plate 2025, the light 7261 cannot pass through the linearly polarizing plate 2025. The light 7251 is light of the light 7261 ′ that has passed through the linear polarizing plate 2025.
[0089]
The linear polarizing plates 2015 and 2025 can be realized by a Gran-Thomson prism, a Nicol prism, a transparent plastic material coated with a dichroic dye material, or the like. The quarter-wave plate can be realized by a quartz plate, a barium titanate crystal, or the like. Although the thickness of the quarter-wave plate is determined according to the wavelength, the wavelength serving as a reference for determining the thickness is a wavelength of a typical color, What is necessary is just to make the average of the upper limit value and the lower limit value of the wavelength of the light to be output, or the weighted average in consideration of the output light quantity.
[0090]
As shown in FIG. 7, in order to change the linearly polarized light to the right polarized light, it is necessary to arrange the transmission axis of the linearly polarizing plate 2015 and the fast axis of the 波長 wavelength plate 2016 in a fixed relation. is there. This is shown in FIG. Here, the fast axis is as follows. The quarter-wave plate 2016 has two orthogonal vibration plane directions that allow the linearly polarized light incident on the quarter-wave plate 2016 to pass through the quarter-wave plate 2016 without changing its polarization state. . Of these two directions, the axis having the same direction as the direction in which the light propagation speed is faster is called the fast axis.
[0091]
In FIG. 9, light 7141 emitted from the projection unit 104 passes through the linear polarizing plate 2015, the quarter-wave plate 2016, the screen 103, and the quarter-wave plate 2026, and enters the linear polarizing plate 2025 in order. Further, the fast axis 716 of the quarter-wave plate 2016 is arranged at 45 degrees counterclockwise with respect to the transmission axis 715 of the linear polarizing plate 2015 as viewed from the quarter-wave plate 2016. Further, as shown in FIG. 8, in order to cut the right polarized light entering the quarter-wave plate 2026 by the linear polarizer 2025, the fast axis 726 of the quarter-wave plate 2026 and the linear polarizer It is necessary to arrange the transmission axis 2015 in a fixed relation. For this reason, in FIG. 9, the fast axis 726 of the 波長 wavelength plate 2026 is arranged at 45 degrees clockwise with respect to the transmission axis 725 of the linear polarizing plate 2025 as viewed from the 波長 wavelength plate 2026. .
[0092]
Note that common parts between the components shown in FIG. 2 and the components shown in FIG.
[0093]
As described above, according to the present embodiment, a plurality of users can simultaneously input operation instructions in a large screen display device that performs input using a pointer.
[0094]
In addition, by attaching a polarizing plate having different polarization characteristics to the front of the projection unit 104 and the camera 105, it is possible to prevent the camera from photographing the light from the projection unit 104 reflected to the back side of the screen, and from the pointer. Can be photographed with high precision.
[0095]
In this embodiment, the combination of the right polarizing plate and the left polarizing plate is used. However, the present invention is not limited to this, and a combination of linear polarizing plates whose transmission axes are orthogonal to each other may be used.
[0096]
Further, in the present embodiment, the circularly polarized light is generated by using the 波長 wavelength plate, but the elliptically polarized light may be generated by using another wavelength plate.
[0097]
Further, in the present embodiment, a plurality of pointers are handled.However, in the case where only one kind of pointer is used, in order to distinguish light from the pointer from light from the projection unit, the polarizing plate of the present embodiment is used. A projection unit and a camera may be used.
[0098]
In addition, a projection unit having a polarizing plate and a camera as in this embodiment can be applied to the second embodiment.
[0099]
Next, a fourth embodiment of the present invention will be described with reference to FIG. In the third embodiment, the rear projection type large display is targeted. In the present embodiment, the method of the third embodiment is applied to a front projection large display which is less expensive than the rear projection large display. is there.
[0100]
In the case of a front projection display, the projection unit 104 is provided on the front of the screen 301. The screen 301 is a reflection type screen, and reflects the light from the projection unit 104 projected from the front surface of the screen 301 to the front surface. The screen 301 is an impermeable sheet, and nothing is seen when the screen 301 is viewed from the back. The camera 105 needs to photograph the screen 301 from the front of the screen 301. For this reason, in the case of a front projection display, light from the projection unit 104 and light from the pointers 101 and 102 used by the user to input instructions and the like are mixed on the screen. When the screen 301 is photographed by the camera 105 from the front, it is not possible to distinguish whether the light reflected on the screen 301 is light from the pointer or light from the projection unit 104. In this embodiment, this problem is solved by using a polarizing plate as in the second embodiment.
[0101]
FIG. 3 shows a system configuration of the display device according to the present embodiment. As shown in FIG. 3, the projection unit 104 has a right polarizer 201 for projecting only right polarized light from the projection unit 104 on the front surface thereof. The camera 105 has, on its front surface, a left polarizer 202 for preventing transmission of only clockwise polarized light. The light emitted from the projection unit 104 is changed to right polarization by the right polarizing plate 201 and reaches the screen 301. Light from the projection unit 104 that is reflected by the screen 301 and enters the camera 105 is filtered by the left polarizing plate 202 in front of the camera 105 and cannot enter the camera 105. On the other hand, the light projected by the user with the pointers 101 and 102 is reflected by the screen 301 and then filtered by the left polarizer 202 in front of the camera 105. However, since the light from the pointers 101 and 102 has right polarized light and left polarized light, left polarized light from the pointer enters the camera 105. As a result, like the camera image 302, the camera 105 captures only the light 1011 ′ and 1021 ′ from the pointers 101 and 102, and does not capture the light from the projection unit 104. The input detection unit 107 can detect an input by the pointers 101 and 102 by processing the camera image 302.
Note that components common to the components illustrated in FIG. 3 and the components illustrated in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0102]
As described above, according to the present embodiment, input can be performed using the pointer that projects visible light even in the case of a large-sized front-projection display. In this embodiment, the case where a plurality of pointers identified by a plurality of colors are used has been described. However, even when one pointer is used, the light from the projection unit can be obtained by using a polarizing plate as in this embodiment. And the light from the pointer can be accurately distinguished.
[0103]
Next, a fifth embodiment of the present invention will be described. In the first to fourth embodiments, a plurality of pointers are distinguished by utilizing the fact that the frequency and intensity of light from the pointers differ from one pointer to another. In the present embodiment, the plurality of pointers are distinguished by the polarization state of light.
[0104]
FIG. 4 shows the configuration of this embodiment. In this embodiment, different polarizing plates are provided for the two red pointers. The pointer 101 is provided with a left polarizing plate 401 for transmitting only left polarized light, and the pointer 102 is provided with a right polarizing plate 402 for transmitting only right polarized light in front of each pointer. As a result, light having left polarization is projected from the pointer 101, and light having right polarization is projected from the pointer 102.
[0105]
In front of the camera 105, a variable polarizing plate 403 capable of selecting polarized light to be passed out of right-polarized light and left-polarized light in accordance with a signal from the input detection unit 407 is provided. As shown in FIG. 10, the variable polarizing plate 403 includes a quarter-wave plate 4037, a half-wave plate 4036, and a linear polarizing plate 4035. The half-wave plate 4036 is made of a TN (Twisted Nematic) liquid crystal, and when no voltage is applied, rotates the direction of the vibration plane of the incident linearly polarized light by 90 degrees. When a predetermined voltage is applied, the direction of the vibration plane of the incident linearly polarized light is not changed.
[0106]
FIG. 12 shows the directions of the fast axis 1237 of the 波長 wavelength plate 4037 and the transmission axis 1235 of the linearly polarizing plate 4035. In this figure, the direction of the fast axis 1237 of the 波長 wavelength plate 4037 is arranged so that when left polarized light is incident, it is changed to linear polarized light having a vibration plane in the vertical direction. That is, the fast axis 1237 is disposed at an angle of 45 degrees counterclockwise from the vertical direction 1201 when viewed from the light incident direction. Further, the transmission axis 1235 of the linear polarizing plate 4035 is arranged in the horizontal direction so as to transmit right polarized light from the pointer 102 when a voltage is applied to the half-wave plate 4036.
[0107]
In FIG. 11, when the left-handed polarized light from the pointer 101 and the right-handed polarized light from the pointer 102 are incident on the variable polarizing plate 403, the 面 -wave plate 4037 and the 波長 -wave plate Change. The vibration surface of the light after passing through the half-wave plate 4036 is in the vertical direction with respect to the light from the pointer 101 when a voltage is applied. Therefore, the light passes through the linear polarizing plate 4035. That is, the light passes through the variable polarizing plate 403. In the drawing, “○” indicates that the light after passing through the 波長 wavelength plate passes through the linear polarizing plate 4035. Further, at this time, since the vibration surface of the light from the pointer 102 is in the horizontal direction, it does not pass through the linear polarizing plate 4035. That is, the light does not pass through the variable polarizing plate 403. In the drawing, “x” indicates that the light after passing through the half-wave plate does not pass through the linear polarizing plate 4035. When no voltage is applied, the opposite is true. Light from the pointer 101 does not pass through the variable polarizer 403, but light from the pointer 102 passes.
[0108]
The input detection unit 407 controls ON / OFF of the variable polarizing plate 403 via the variable polarizing plate interface 404 as described above, so that only the left polarized light enters the camera 105 or only the right polarized light enters the camera 105. Or can be incident on
[0109]
Next, the processing procedure will be described. The input detection unit 407 first detects an input of the pointer 101. The input detection unit 407 transmits to the variable polarizing plate 403 an OFF signal indicating that no voltage is applied to the variable polarizing plate 403 so that only the left polarized light is transmitted. The variable polarizer 403 receives this signal and changes so as to transmit only left polarized light. Only the left polarized light enters the camera 105. Therefore, as shown in FIG. 4, only the light from the pointer 101 projecting the left polarized light enters the camera 105, and the right polarized light from the pointer 102 does not enter the camera 105. The camera 105 sends an image showing only the light 1011 ′ from the pointer 101 to the input detection unit 407. The input detection unit 407 samples the image from the camera 105 frame by frame as in the first embodiment. Then, a search is made for each frame to see if there is a pixel of a color possessed by the light from the pointer 101, and an input position of the pointer 101 is searched. On the other hand, in order to detect light from the pointer 102, the input detection unit 407 changes the polarization characteristic of the variable polarizer 403 so that only the right-polarized light is transmitted, and transmits to the camera 105 the right-polarized light projected by the pointer 102. Only to be incident. Thus, the input detection unit 407 detects the position indicated by the pointer 102. Next, similarly to the first embodiment, the input detection unit 407 compares the current light emission state of each of the detected pointers with the previous light emission state, determines the event type, and inputs the event type to the control unit 106. Submit information.
Note that common parts between the components shown in FIG. 4 and the components shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0110]
As described above, according to the present embodiment, a plurality of users can simultaneously input on the large-screen input device for inputting using the pointer.
[0111]
By the way, when inputting with the pointer, it is necessary to know the input position, pointer type, and event type. In the first to fifth embodiments, the event type is distinguished by the occurrence and disappearance of the pointer projection light. However, there may be a case where a large number of event types are required that cannot be expressed only by a combination of occurrence and disappearance of the projection light of the pointer. In order to express a large number of event types, a mouse has a plurality of click buttons. In a sixth embodiment described below, a plurality of buttons are provided on the pointer so that a large number of event types can be represented by the pointer, and information on the plurality of event types identified by the button operation is input from the pointer. Transmitted directly to the unit.
[0112]
A sixth embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the pointers 501 and 502 are provided with as many selection buttons as are necessary to specify a large number of event types when the user specifies them.
[0113]
FIG. 5 shows a functional block diagram of the sixth embodiment. The input detection unit 507 obtains a pointer type and an event type by wireless communication from each of the pointers 501 and 502 via the receiving device (antenna) 503.
[0114]
FIG. 18 shows the hardware configuration of the sixth embodiment. In this embodiment, an RF interface unit 181 and an antenna 503 are added to the first embodiment. The input detection unit 507 is realized by the CPU 131, the main memory 132, the input / output control unit 135, and the RF interface unit 181. The RF interface unit 181 demodulates the RF signal received via the antenna 503, and detects a pointer type and an event type from the demodulated signal. The detected pointer type and event type are stored in the hard disk 134 via the input / output control unit 135.
[0115]
FIG. 17 shows the internal configuration of the pointers 501 and 502. The pointers 501 and 502 include a light emitting diode 141, a switch 142, a battery 143, selection buttons 171, 172, and 173 for selecting an event type, and an RF having a modulation frequency corresponding to the selection buttons 171, 172, and 173. A modulation section 177 for outputting a signal, an antenna 178 for receiving an RF signal and outputting a radio wave, and a resistor 174 for outputting a high signal when the selection buttons 171, 172 and 173 are on, and a low signal when the selection buttons 171, 172 and 173 are off. , 175 and 176. When the user selects any of the selection buttons 171, 172, and 173, the modulation unit 177 determines a signal indicating an event type corresponding to the button selected by the user, and which pointer 501 or 502 has transmitted the signal. An RF signal having a modulation frequency corresponding to the set is output as a set including a signal indicating a pointer type for identification.
[0116]
The input detection unit 507 obtains a pointer type and an event type by wireless communication from each of the pointers 501 and 502 via the receiving device (antenna) 503.
[0117]
On the other hand, according to the method described in the first embodiment, the input detection unit 507 periodically detects the input position and the pointer type from the camera image, and stores the input position for each pointer type. Upon receiving the pointer type and the event information wirelessly transmitted from the pointers 501 and 502, the input detection unit 507 determines the input position stored in the input detection unit 107 in advance and stores the pointer type transmitted wirelessly. Is used as a search key, and the input position of the pointer type transmitted from the pointers 501 and 502 is searched. Next, the input detection unit 507 outputs the searched input position and the transmitted pointer type and event type to the control unit 106 as input information. The control unit 106 performs processing according to an input position from the input detection unit 507, a pointer type, and an event type.
Note that the same reference numerals denote the same parts in the components shown in FIG. 5 and the components shown in FIG. 1, and a detailed description thereof will be omitted.
[0118]
According to the present embodiment, a large number of event types that cannot be realized in the first, second, third, fourth, and fifth embodiments of the present invention can be defined in a large-screen display device that inputs using a pointer. In the present embodiment, the case where input is performed using a plurality of pointers has been described. However, the method of designating the event type according to the present embodiment can be applied to a case where there is only one pointer.
[0119]
A large-screen display device having a pointer according to the present invention can be applied to a plant monitoring system using a large-screen display device. For example, in a plant monitoring system including the display device and a plant monitoring computer system that collects and processes information on the status of the plant to be monitored, the display device displays the status of the plant, May be received and an instruction may be sent to the plant monitoring computer system to monitor the plant.
[0120]
Further, the large-screen display device having the pointer according to the present invention can be applied to a traffic control system using the large-screen display device. For example, in a traffic control system including this display device and a control computer system that collects and processes information on the movement state of an aircraft or vehicle to be controlled, the display device displays the movement state of an aircraft or the like. Alternatively, an instruction regarding control of an aircraft or the like may be received, and the instruction may be sent to the control computer system to control the aircraft or the like.
[0121]
Further, the large screen display device having the pointer according to the present invention can be applied to a presentation system using the large screen display device. For example, in a presentation system having this display device and a computer system that outputs information to be presented to the display device, the display device displays the information and sends the received input to the computer system, May be performed.
[0122]
Further, the large-screen display device having the pointer according to the present invention can be applied to an electronic conference system using the large-screen display device. For example, in an electronic conference system including the display device and a communication device that externally receives an image to be displayed on the display device, the display device displays the received image and outputs a received input to the communication device. Then, a meeting with the outside may be held.
[0123]
【The invention's effect】
According to the present invention, an input operation is performed using a pointer that projects visible light having different light emission characteristics, so that the visible light output by each of the pointers can be easily confirmed, and a plurality of persons can simultaneously perform large-scale operations. Input operation to the screen can be performed.
[0124]
Further, the display device according to the present invention can be used in a system using all large-screen display devices. Examples of such a system include a plant control system, a traffic control system, a presentation system, an electronic conference system, and the like.
[Brief description of the drawings]
FIG. 1 is a block diagram of a display device according to a first embodiment of the present invention.
FIG. 2 is a block diagram of a display device according to a second embodiment of the present invention.
FIG. 3 is a block diagram of a display device according to a third embodiment of the present invention.
FIG. 4 is a block diagram of a display device according to a fourth embodiment of the present invention.
FIG. 5 is a block diagram of a display device according to a fifth embodiment of the present invention.
FIG. 6 is a block diagram of a display device according to a second embodiment of the present invention.
FIG. 7 is an explanatory diagram illustrating a configuration of a polarizing plate.
FIG. 8 is an explanatory diagram illustrating a configuration of a polarizing plate.
FIG. 9 is an explanatory diagram showing an arrangement of a fast axis and a transmission axis of a polarizing plate.
FIG. 10 is an explanatory diagram showing a configuration of a variable polarizing plate.
FIG. 11 is an explanatory diagram showing an operation of the variable polarizing plate.
FIG. 12 is an explanatory diagram showing an arrangement of a fast axis and a transmission axis of a variable polarizing plate.
FIG. 13 is a block diagram of hardware of a computer system.
FIG. 14 is a block diagram of a pointer.
FIG. 15 is a processing flow of an input detection unit.
FIG. 16 is a block diagram of a display unit.
FIG. 17 is a block diagram of a pointer.
FIG. 18 is a block diagram of hardware of a computer system.
[Explanation of symbols]
101, 102, 501, 502 pointer, 103 display screen, 104 projection unit, 105 camera, 106 control unit, 107 input detection unit, 108 display unit, 109, 203, 302, 405 camera image , 201, 202, 401, 402, 403: polarizing plate; 301: front projection display screen; 503: receiver

Claims (7)

A screen on which the image is displayed,
Display means for displaying the image by projecting light on the screen,
A display device having a position designating means for designating a position on the screen,
The position specifying means,
A plurality of pointers for projecting light for designating the position from the front of the screen to the screen, wherein the pointers are different from each other with respect to at least one of a color of light, a light intensity, and a polarization state of the light;
A camera that receives the plurality of lights projected on the screen by the plurality of pointers;
With the received light, position identification means for identifying a position designated by the pointer,
The received light is light projected by any of the plurality of pointers based on at least one of a color, an intensity of the light, and a polarization state of the light different from each other. Or pointer identifying means for identifying each of the identified positions,
One of the upper Symbol pointer includes a first light emitting means, the light output by the first emitting means, the first polarized light generation vibration plane of the light in the first direction changes in the polarization rotating Means,
Another one of the pointers is a second light emitting means, and the light output from the second light emitting means rotates the vibration surface of the light in a second direction different from the first direction. Second polarization generating means for changing the polarization to
The display device has polarization selecting means for switching and selecting between polarized light in which the vibrating surface of the light rotates in the first direction and polarized light in which the vibrating surface of the light rotates in the second direction. And
The display device, wherein the camera receives the polarized light selected by the polarization selecting unit. The display device according to claim 1 ,
The first polarization generation unit changes the selected linearly polarized light into a polarized light that rotates in the first direction, and a linearly polarizing plate that selects only linearly polarized light from the light output by the first light emitting unit.波長 wavelength plate arranged as follows,
The second polarization generation unit changes a linear polarization plate that selects only linearly polarized light out of the light output by the second light emitting unit, and the selected linearly polarized light to a polarization that rotates in the second direction.波長 wavelength plate arranged as follows,
The polarization selecting means is a quarter-wave plate for changing the two types of incident polarized light into linearly polarized light having vibration planes orthogonal to each other, and rotating the vibration plane of the obtained linearly polarized light by 90 degrees, and not rotating A display device comprising: vibrating plane rotating means capable of switching between the two cases; and a linear polarizing plate that passes one of two types of polarized light passing through the vibrating plane rotating means. A screen on which the image is displayed,
Display means for displaying by projecting light in one polarization state on a screen;
Position designation means for designating a position on the screen,
The position specifying means,
The screen includes at least light in a different polarization state from the light projected by the display means, and light for specifying the position, which is different from at least one of the color and intensity of the included light. , A plurality of pointers projecting from the front of the screen,
Polarization selecting means for selecting and transmitting light in a different polarization state from the light projected by the display means,
A camera that receives the polarization selected by the polarization selection unit,
With the received light, position identification means for identifying a position designated by the pointer,
Among the light projected on the screen by the plurality of pointers, the received light is any one of the plurality of pointers based on the fact that at least one of the color and intensity of light is different from each other. A pointer identifying means for identifying, for each of the identified positions, whether the light is projected by the pointer. The display device according to claim 3 ,
The display device, wherein the display means is provided on a front surface of the screen, and projects light to display the image from the front surface of the screen. The display device according to claim 3 ,
The display device, wherein the display means is provided on a back surface of the screen, and projects light to display the image from the back surface of the screen. The display device according to claim 3, 4 or 5 ,
The display device according to claim 1, wherein the display unit includes: a light emitting unit; and a polarization generation unit that converts light output from the light emitting unit into polarized light whose vibration plane rotates in one direction. The display device according to claim 6 ,
The polarization generation means is a linear polarizer that selects only linearly polarized light out of the light output by the light emitting means, and is arranged to change the selected linearly polarized light to polarization that rotates in the one direction. A four-wave plate,
The display device, wherein the polarization selecting means includes a quarter-wave plate that converts the incident polarized light into linearly polarized light, and a linearly polarizing plate that does not pass the obtained linearly polarized light.

Images