JP2012078739A - Image display device, projector, and control method of image display device - Google Patents

Abstract

An image display device, a projector, and an image display device capable of preventing the recording medium from being handled by other users even if the recording medium is left in the image reproducing unit. A control method is provided.
When a user authentication function is valid, user authentication is performed using a personal identification number, and when user authentication is established, subsequent use of the projector is possible. However, when the DVD medium M is inserted in the disk slot at the time of the ON operation, the entered security code is either the administrator security code or the security code (specific password) when the DVD media M is inserted. If they are different, the operation of the DVD playback unit 25 is restricted according to the set contents of the security level. Even in this case, it is possible to project an image based on the image information input from the image supply device C to the image information input unit 31.
[Selection] Figure 2

Description

  The present invention relates to an image display device including an image reproduction unit that reproduces image information recorded on a recording medium, a projector, and a control method for the image display device.

  2. Description of the Related Art An image display device that displays an image is known which is integrally provided with image reproduction means for reproducing image information recorded on a recording medium such as a DVD (Digital Versatile Disc) or a Blu-ray disc ( For example, see Patent Document 1). By using such an image display device, an image based on image information recorded on a recording medium can be easily viewed without connecting an external image reproduction device.

JP 2005-99617 A

  However, since the image display device as described above can easily view images, when it is installed in a place that can be used by an unspecified number of users such as a company or a school, it can be used by various users. There is a risk of being used without permission. For this reason, if the recording medium is left in the image reproducing means, the recording medium may be taken out by another user or the highly confidential image information may be reproduced and viewed.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 An image display apparatus according to this application example includes an image reproduction unit that reproduces image information recorded on a mounted recording medium, an image display unit that displays an image based on the image information, and a user An input unit that accepts input of authentication information for performing authentication, a storage unit that stores a plurality of pieces of verification information that is collated with the authentication information, the authentication information is collated with the plurality of pieces of collation information, and the authentication information is An authentication unit that establishes the user authentication when it matches any of the collation information, and the recording medium is loaded in the image reproduction unit even if the authentication unit establishes the user authentication And a control unit that restricts the operation of the image reproduction unit when authentication information different from the authentication information input in the user authentication is input.

  According to this image display apparatus, when authentication information different from the authentication information input by the user authentication when the recording medium is mounted on the image reproducing unit is input, the authentication unit establishes the user authentication. Even in this case, the operation of the image reproduction unit is limited. For this reason, even if the recording medium is left attached to the image reproducing unit, the recording medium can be prevented from being handled by other users.

  Application Example 2 In the image display device according to the application example described above, the control unit receives authentication information that is different from authentication information input by user authentication when the recording medium is mounted on the image reproduction unit. In such a case, it is desirable to prohibit ejection of the recording medium from the image reproduction unit.

  According to this image display device, when authentication information different from the authentication information input by user authentication when the recording medium is mounted on the image reproducing unit is input, the control unit receives the recording medium from the image reproducing unit. Therefore, even if the recording medium is left attached to the image reproducing unit, it is possible to prevent the recording medium from being taken out by another user.

  Application Example 3 In the image display device according to the application example, the control unit receives authentication information that is different from authentication information input by user authentication when the recording medium is mounted on the image reproduction unit. In such a case, it is desirable to prohibit the reproduction of the image information.

  According to this image display device, the control unit prohibits the reproduction of the image information when authentication information different from the authentication information input by the user authentication when the recording medium is mounted on the image reproduction unit is input. Therefore, even if the recording medium is left in the image reproducing unit, it can be prevented that the image information is reproduced and viewed by other users.

  Application Example 4 In the image display device according to the application example, as an operation restriction of the image reproduction unit, a first mode for prohibiting ejection of the recording medium from the image reproduction unit, and A second mode for prohibiting ejection of the recording medium and prohibiting reproduction of the image information may be selectable.

  Application Example 5 In the image display device according to the application example, the storage unit stores administrator verification information for identifying an administrator, and the control unit includes the recording medium in the image reproduction unit. The operation of the image reproducing unit may be limited when authentication information that is different from both the authentication information input by the user authentication and the collation information for manager is input.

  Application Example 6 A projector according to this application example includes an image reproduction unit that reproduces image information recorded on a mounted recording medium, an image projection unit that projects an image based on the image information, and user authentication. An input unit that receives input of authentication information to be performed; a storage unit that stores a plurality of pieces of verification information to be verified with the authentication information; and the authentication information is verified with the plurality of pieces of verification information. An authentication unit that establishes the user authentication when it matches the verification information, and a user when the recording medium is loaded in the image reproduction unit even if the authentication unit establishes the user authentication And a control unit that restricts the operation of the image reproduction unit when authentication information different from the authentication information input by the authentication is input.

  According to this projector, when authentication information different from the authentication information input in the user authentication when the recording medium is mounted on the image reproducing unit is input, the authentication unit establishes the user authentication. Even in such a case, the operation of the image reproducing unit is limited. For this reason, even if the recording medium is left attached to the image reproducing unit, the recording medium can be prevented from being handled by other users.

  Application Example 7 A method for controlling an image display device according to this application example is a method for controlling an image display device including an image reproduction unit that reproduces image information recorded on a mounted recording medium. An input step for accepting input of authentication information for performing authentication, the authentication information input in the input step is compared with a plurality of pieces of verification information stored in the image display device, and any of the authentication information is An authentication step that establishes the user authentication when it matches the verification information of the user, and a user authentication when the recording medium is mounted on the image reproduction unit even if the user authentication is established in the authentication step An operation restricting step for restricting the operation of the image reproducing unit when authentication information different from the authentication information input in step S3 is input.

  According to the control method of the image display apparatus, when authentication information different from the authentication information input by the user authentication when the recording medium is mounted on the image reproduction unit is input, the user authentication is established. Even so, the operation of the image reproduction unit is limited. For this reason, even if the recording medium is left attached to the image reproducing unit, the recording medium can be prevented from being handled by other users.

  Application Example 8 In the method for controlling an image display device according to the application example, in the operation limiting step, authentication different from authentication information input by user authentication when the recording medium is mounted in the image reproduction unit. When information is input, it is desirable to prohibit ejection of the recording medium from the image playback unit.

  According to the control method of the image display device, when authentication information different from the authentication information input by the user authentication when the recording medium is mounted on the image reproducing unit is input, the recording medium from the image reproducing unit Therefore, even if the recording medium is left attached to the image reproducing unit, it is possible to prevent the recording medium from being taken out by another user.

  Application Example 9 In the method for controlling an image display device according to the application example, in the operation limiting step, authentication different from authentication information input by user authentication when the recording medium is mounted in the image reproduction unit. When information is input, it is desirable to prohibit the reproduction of the image information.

  According to the control method of the image display device, the reproduction of the image information is prohibited when the authentication information different from the authentication information input by the user authentication when the recording medium is mounted on the image reproducing unit is input. Therefore, even if the recording medium is left in the image reproducing unit, it can be prevented that the image information is reproduced and viewed by other users.

  Application Example 10 In the control method of the image display device according to the application example, as the operation restriction of the image reproduction unit, a first mode for prohibiting ejection of the recording medium from the image reproduction unit, and the image reproduction It may be possible to select a second mode in which ejection of the recording medium from the recording unit is prohibited and reproduction of the image information is prohibited.

  Application Example 11 In the method for controlling an image display device according to the application example, the image display device stores administrator verification information for identifying an administrator. In the operation limiting step, Restricts the operation of the image playback unit when authentication information input by user authentication when the recording medium is mounted on the image playback unit and authentication information that is different from both of the administrator verification information are input. You may make it do.

The perspective view of a projector. The block diagram which shows the circuit structure of a projector. 6 is a flowchart for explaining the operation of the projector when a power key or a reproduction key is operated in a standby state. 6 is a flowchart for explaining the operation of the projector when a power key or a reproduction key is operated in a standby state. Explanatory drawing which shows an authentication image. 6 is a flowchart for explaining the operation of the projector when an eject key is operated in a standby state. 6 is a flowchart for explaining the operation of the projector when an eject key is operated in a standby state. 7 is a flowchart for explaining the operation of the projector when a DVD medium is inserted into a disk slot in a standby state.

Hereinafter, a projector as one of image display apparatuses will be described with reference to the drawings.
The projector according to the present embodiment includes a DVD playback unit capable of playing back a DVD (Digital Versatile Disc), and can project an image based on image information recorded on a DVD medium. In addition, the projector according to the present embodiment includes a user authentication function for authenticating a user using a personal identification number. Based on the personal identification number input by the user, the projector is used, that is, an image is projected using the projector. Can be allowed or prohibited. Note that this user authentication function can be switched between enabled and disabled. When the user authentication function is disabled, the projector can be used without entering a personal identification number.

FIG. 1 is a perspective view of the projector according to the present embodiment.
As shown in FIG. 1, the projector 1 has a configuration in which the apparatus main body is covered by a housing 2 that forms an exterior. A projection lens 13 for projecting an image onto an external screen or the like is exposed on the front surface 2 f of the housing 2, and a disk slot 3 for inserting a DVD medium as a recording medium below the projection lens 13. Is provided. Further, an operation signal receiving unit 24 for receiving an operation signal transmitted from the remote controller 23 is disposed on the front surface 2 f of the housing 2.

  The housing 2 is provided with a main body operation unit 22 including a plurality of operation keys (operation buttons), and various instructions can be given to the projector 1. Of the plurality of operation keys constituting the main body operation unit 22, an operation key (eject key) for ejecting (ejecting) the DVD medium from the disk slot 3 is provided on the front surface 2f of the housing 2 (near the disk slot 3). The other operation keys are arranged on the upper surface 2 t of the housing 2. The remote controller 23 is also provided with a plurality of operation keys for giving various instructions to the projector 1, similarly to the main body operation unit 22, so that the projector 1 can be remotely operated.

FIG. 2 is a block diagram illustrating a circuit configuration of the projector.
As shown in FIG. 2, the projector 1 includes an image projection unit 10, a control unit 20, a storage unit 21, a main body operation unit 22, a remote control 23, an operation signal reception unit 24, a DVD playback unit 25, an image information input unit 31, an image. A processing unit 32, an OSD processing unit 33, a power supply circuit 34, a light source control unit 35, and the like are provided.

  The image projection unit 10 includes a light source 11, three liquid crystal light valves 12R, 12G, and 12B as light modulation devices, a projection lens 13 as a projection optical system, a light valve drive unit 14, and the like. The image projection unit 10 corresponds to an image display unit, and modulates the light emitted from the light source 11 into an image (image light) by the liquid crystal light valves 12R, 12G, and 12B. Project and display on an external screen SC or the like.

  The light source 11 includes a discharge-type light source lamp 11a made of an ultra-high pressure mercury lamp, a metal halide lamp, or the like, and a reflector 11b that reflects light emitted from the light source lamp 11a toward the liquid crystal light valves 12R, 12G, and 12B. ing. Light emitted from the light source 11 is converted into light having a substantially uniform luminance distribution by an integrator optical system (not shown), and red (R), green (G), and blue, which are the three primary colors of light, by a color separation optical system (not shown). After being separated into each color light component of (B), it enters the liquid crystal light valves 12R, 12G, and 12B, respectively.

  The liquid crystal light valves 12R, 12G, and 12B are configured by a transmissive liquid crystal panel in which liquid crystal is sealed between a pair of transparent substrates. In the liquid crystal light valves 12R, 12G, and 12B, a plurality of pixels (not shown) arranged in a matrix are formed, and a driving voltage can be applied to the liquid crystal for each pixel. When the light valve driving unit 14 applies a driving voltage corresponding to the input image information to each pixel, each pixel is set to a light transmittance corresponding to the image information. For this reason, the light emitted from the light source 11 passes through the liquid crystal light valves 12R, 12G, and 12B and is modulated into image light corresponding to the image information. The image light of each color is synthesized for each pixel by a color synthesis optical system (not shown) to become color image light, and then magnified and projected by the projection lens 13.

  The control unit 20 includes a CPU (Central Processing Unit), a RAM (Random Access Memory) used for temporary storage of various data, and the like, and operates according to a control program stored in the storage unit 21 to operate the projector 1. Centrally control the operation. That is, the control unit 20 functions as a computer together with the storage unit 21.

  The storage unit 21 is configured by a rewritable nonvolatile memory such as a flash memory or FeRAM (Ferroelectric RAM). The storage unit 21 stores a control program for controlling the operation of the projector 1, various setting data for defining operation conditions of the projector 1, and the like. In the present embodiment, as setting data, a flag (authentication flag) indicating whether the user authentication function is enabled or disabled, a plurality of personal identification numbers referred to when the user authentication function is enabled, and a security strength (security level) are expressed. Security level information (also simply referred to as “level information”) and the like are stored. Note that setting data such as an authentication flag, a personal identification number, and security level information can be appropriately set (changed) by the user.

  The main body operation unit 22 and the remote controller 23 include a plurality of operation keys as described above, and correspond to an input operation unit that receives an input operation (operation of an operation key) from a user. In addition to the eject key described above, the plurality of operation keys include a power key for switching the power on and off, an input switching key for selecting an input source (image information) to be displayed, and DVD media A reproduction key for starting reproduction, a stop key for stopping reproduction of the DVD medium, and the like are included in both the main body operation unit 22 and the remote controller 23. In addition, a menu key for displaying an environment setting menu or the like, direction keys (four operation keys corresponding to up, down, left and right) used for selecting an item in the environment setting menu, a determination key for confirming the selected item, Only the remote controller 23 is provided with a cancel key for canceling the operation and the like, numeric keys (10 operation keys corresponding to 0 to 9) for inputting a personal identification number, and the like. When the user operates various operation keys of the main body operation unit 22, the main body operation unit 22 outputs an operation signal corresponding to the user operation content (operated operation key) to the control unit 20. When the user operates various operation keys of the remote controller 23, the remote controller 23 emits an infrared operation signal corresponding to the user's operation content, and the operation signal receiving unit 24 receives this and transmits it to the control unit 20.

  The DVD playback unit 25 corresponds to an image playback unit that plays back image information recorded on a DVD medium M that is a recording medium, and includes an insertion sensor 26, a media transport unit 27, a mounting sensor 28, and a data reading unit 29. And the data processing unit 30 and the like.

  The insertion sensor 26 is disposed in the vicinity of the disk slot 3, detects that a part of the DVD medium M has been inserted into the disk slot 3, and notifies the control unit 20.

  The media transport unit 27 is configured by a transport roller for transporting the DVD medium M, a drive motor (none of which is shown) that rotationally drives the transport roller, and the like, and based on an instruction from the control unit 20, a DVD playback unit 25, the DVD medium M is transported. Specifically, when the user inserts a part of the DVD medium M into the disk slot 3 from the outside and the insertion sensor 26 detects this insertion, the control unit 20 instructs the media transport unit 27 to M is loaded inside and mounted on a turntable (not shown). When the user operates the eject key, the control unit 20 instructs the media transport unit 27 to detach the DVD media M from the turntable and eject the DVD media M from the disk slot 3 to the outside.

  The mounting sensor 28 is disposed in the vicinity of the turntable, detects that the DVD medium M is mounted on the turntable, and notifies the control unit 20 of it.

  Based on an instruction from the control unit 20, the data reading unit 29 rotates the DVD medium M mounted on the turntable by a spindle motor (not shown) and scans an optical pickup (not shown). The data stream recorded on the DVD medium M is sequentially read. This data stream is information in which encoded image information and audio information are multiplexed, and the data stream read by the data reading unit 29 is sequentially output to the data processing unit 30.

  The data processing unit 30 includes a demultiplexer, a decoder, and the like. Based on an instruction from the control unit 20, the data processing unit 30 separates the data stream input from the data reading unit 29 into image information and audio information. A process of decoding (decoding) image information and audio information is performed. The data processing unit 30 outputs the decoded image information to the image processing unit 32, and outputs the decoded audio information to an audio output unit (not shown). In this specification, the DVD reproduction unit 25 reads a data stream from the DVD medium M and outputs image information based on the data stream. In this specification, “reproduce image information” or “reproduce the DVD medium M”. ".

  When the main body operation unit 22 or the remote controller 23 accepts the operation of the reproduction key, the control unit 20 instructs the DVD reproduction unit 25 to start the reproduction of the image information, and the main body operation unit 22 or the remote control 23 uses the stop key. When the operation is accepted, the DVD reproducing unit 25 is instructed to stop the reproduction of the image information.

  The insertion sensor 26 and the mounting sensor 28 can be configured using various detection means such as a mechanical switch, an optical sensor, and a magnetic sensor, for example. The mounting sensor 28 may be configured to detect whether or not the DVD medium M is mounted based on the signal level of reflected light received by the optical pickup.

  Image information is input to the image information input unit 31 from an external image supply device C such as a computer or various video playback devices. The image information input unit 31 outputs the input image information to the image processing unit 32.

  The image processing unit 32 performs various types of image processing on the image information input from the DVD playback unit 25 or the image information input unit 31 based on instructions from the control unit 20. Specifically, the image processing unit 32 selects the image information input from the DVD playback unit 25 and the image information input from the image information input unit 31 with the input switching key of the main body operation unit 22 or the remote controller 23. The processed image information is processed, and this image information is converted into image information indicating the gradation of each pixel of the liquid crystal light valves 12R, 12G, and 12B, that is, image information for defining a drive voltage applied to each pixel. To do. Further, the image processing unit 32 performs image quality adjustment processing for adjusting brightness, contrast, sharpness, hue, and the like on the converted image information, and outputs the processed image information to the OSD processing unit 33. .

  The OSD processing unit 33 performs processing for superimposing and displaying an OSD (on-screen display) image such as a menu image or a message image on a projected image (projection image) based on an instruction from the control unit 20. I do. The OSD processing unit 33 includes an OSD memory (not shown), and stores OSD image information representing graphics, fonts, and the like for forming an OSD image. When the control unit 20 instructs to superimpose the OSD image, the OSD processing unit 33 reads necessary OSD image information from the OSD memory, and performs image processing so that the OSD image is superimposed at a predetermined position on the projected image. The OSD image information is synthesized with the image information input from the unit 32. The image information combined with the OSD image information is output to the light valve driving unit 14. When there is no instruction to superimpose the OSD image from the control unit 20, the OSD processing unit 33 outputs the image information input from the image processing unit 32 to the light valve driving unit 14 as it is.

  When the light valve driving unit 14 drives the liquid crystal light valves 12R, 12G, and 12B according to the input image information, the liquid crystal light valves 12R, 12G, and 12B convert the light emitted from the light source 11 into image light according to the image information. Modulated and this image light is projected from the projection lens 13 onto the screen SC.

  The power supply circuit 34 is supplied with commercial power such as AC 100V from the outside. The power supply circuit 34 converts a commercial power supply (AC power supply) into a DC power supply having a predetermined voltage, and supplies power to each unit of the projector 1. Further, the power supply circuit 34 supplies power (operating power) necessary for image projection to each unit based on an instruction from the control unit 20 (hereinafter referred to as “power-on state”), and the operating power. It is possible to switch between a state of stopping supply and waiting for an operation for turning on the power (hereinafter referred to as “standby state” or “power-off state”).

  Based on an instruction from the control unit 20, the light source control unit 35 controls the supply and stop of power to the light source 11 and switches between turning on and off the light source 11.

  The projector 1 of the present embodiment is configured as described above. When commercial power is supplied to the power supply circuit 34, the power supply circuit 34 includes at least the control unit 20, the storage unit 21, the main body operation unit 22, and the operation. Electric power (standby power) is supplied to the signal receiving unit 24, and the control unit 20 receives the electric power supply and starts an operation according to the control program. Immediately after the commercial power is supplied, the projector 1 is in a standby state (power off state), and waits for an operation for turning on the power in a state where the light source 11 is turned off.

  In the standby state, the user can shift the projector 1 to the power-on state by operating a power key, a playback key, or an eject key provided in the main body operation unit 22 and the remote controller 23. In addition to operating the above-described operation keys, the DVD medium M can be shifted from the standby state to the power-on state by inserting it into the disk slot 3. In this specification, the operation for turning on the projector 1, that is, the operation of the power key, the operation of the playback key, the operation of the eject key, and the operation of inserting the DVD medium M are referred to as “on operation”. Also called. When the user performs an on operation and the projector 1 shifts to the power-on state, if the user authentication function is valid, an authentication process is performed, and then different operations are performed according to the type of the on operation.

  3 and 4 are flowcharts for explaining the operation of the projector 1 when the power key or the reproduction key is operated in the standby state. When the user operates the power key or the playback key in the standby state, the control unit 20 operates according to the flow shown in FIGS.

  As shown in FIG. 3, in step S <b> 101, the control unit 20 instructs the power supply circuit 34 to start supplying operating power to each unit, and shifts the projector 1 to the power-on state. In step S102, the control unit 20 instructs the light source control unit 35 to turn on the light source 11 so that an image can be projected.

  In step S103, the control unit 20 determines whether or not the user authentication function is valid based on the authentication flag stored in the storage unit 21. If the user authentication function is invalid, the process proceeds to step S104. If the user authentication function is valid, the process proceeds to step S107.

  When the user authentication function is invalid and the process proceeds to step S104, the control unit 20 determines whether or not the DVD medium M is mounted on the turntable based on the detection result of the mounting sensor 28, that is, the DVD medium in the disk slot 3. It is determined whether or not M is inserted. If the DVD medium M is inserted, the process proceeds to step S105. If the DVD medium M is not inserted, the process proceeds to step S106.

  When the DVD medium M is inserted in the disk slot 3 and the process proceeds to step S105, the control unit 20 instructs the DVD reproduction unit 25 to start the reproduction of the DVD medium M, and the process proceeds to step S106. . As a result, an image (DVD image) based on the image information reproduced by the DVD reproduction unit 25 is projected from the image projection unit 10.

  In step S106, the control unit 20 sets the DVD operation mode to the unlimited mode and ends the flow. Here, the DVD operation mode is information that defines restrictions on the operation of the DVD playback unit 25 (playback, ejection, etc. of the DVD medium M), and the set DVD operation mode is stored in the RAM of the control unit 20. Is done. When the DVD operation mode is set to the unlimited mode as in step S106, the user can use the DVD playback unit 25 without limitation. Further, the DVD operation mode includes an eject prohibit mode for prohibiting the ejection of the DVD medium M and an operation prohibit mode for prohibiting the ejection and reproduction of the DVD medium M in addition to the above-described unlimited mode.

  If the user authentication function is valid in step S103 and the process proceeds to step S107, the control unit 20 instructs the OSD processing unit 33 to prompt the input of a personal identification number (authentication image W1). Is superimposed on the projected image (see FIG. 5). In step S <b> 108, the control unit 20 accepts an input of a password by the user, that is, an input operation of a numeric key provided on the remote controller 23.

  In step S109, the control unit 20 performs an authentication process based on the password entered by the user. Specifically, the control unit 20 sequentially recognizes the operated numeric keys, that is, the input numbers, based on the operation signal input from the operation signal receiving unit 24. When four numbers are input, this is regarded as a four-digit password, and collated with a password (regular password) stored in the storage unit 21. Then, when the entered password matches the regular password, user authentication is established.

  As described above, the storage unit 21 can store a plurality of passwords, and can set individual passwords for each user or for each user group composed of a plurality of users. That is, the control unit 20 collates the input personal identification number with a plurality of personal identification numbers stored in the storage unit 21, and establishes user authentication when it matches one of the personal identification numbers. . In addition, an administrator flag (not shown) indicating that it is a manager password for identifying the manager of the projector 1 can be added to each password stored in the storage unit 21. It has become. When the input password matches the administrator password with the administrator flag added, the control unit 20 recognizes the user who has input the password as the administrator. The administrator is a user who can always use the projector 1 without restriction, and only the administrator is allowed to register (add) a new password, change the setting of an authentication flag or security level, and the like.

  In addition, when the input code number does not match any of the code numbers stored in the storage unit 21, the control unit 20 displays a predetermined message image (not shown) superimposed on the OSD processing unit 33. In addition, the user is notified that the passwords do not match, and the user is repeatedly input the password. If the password does not match for a predetermined number of times (for example, three times), the user authentication is not established.

  In step S110, the control unit 20 determines whether user authentication has been established based on the result of the authentication process in step S109. When the user authentication is established, that is, when any of the regular passwords is input before the number of mismatches of the passwords reaches a predetermined number of times, the control unit 20 sends the authentication image W1 to the OSD processing unit 33. After the superimposition of is finished, the process proceeds to step S113 (see FIG. 4). On the other hand, if the user authentication is not established, that is, if the passwords do not match for a predetermined number of times, the process proceeds to step S111.

  When the user authentication is not established and the process proceeds to step S111, the control unit 20 instructs the light source control unit 35 to turn off the light source 11. In step S112, the control unit 20 instructs the power supply circuit 34 to stop supplying the operating power to each unit, shift the projector 1 to the standby state, and end the flow. As described above, when the user authentication is not established, the power-on state of the projector 1 is not continued, and the user cannot use the projector 1. On the other hand, when the user authentication is established, the power-on state continues and the user can use the projector 1. However, as described later, even when user authentication is established, use of the DVD playback unit 25 may be restricted.

  As shown in FIG. 4, when the user authentication is established and the process proceeds to step S <b> 113, the control unit 20 determines whether or not the DVD medium M is mounted on the turntable based on the detection result of the mounting sensor 28. That is, it is determined whether or not the DVD medium M is inserted in the disk slot 3. If the DVD medium M is inserted, the process proceeds to step S116. If the DVD medium M is not inserted, the process proceeds to step S114.

  When the DVD medium M is not inserted and the process proceeds to step S114, the control unit 20 stores the personal identification number input in step S108, that is, the personal identification number for which user authentication has been established, as the specific personal identification number. To remember. The specific personal identification number means that when user authentication is established in a state where the DVD medium M is not inserted and the DVD medium M is inserted after the user authentication is established, the image information recorded on the DVD medium M is reproduced. Or a password indicating that the user is authorized to eject the DVD medium M. That is, when the DVD medium M is inserted into the disk slot 3 at the time of user authentication (on operation), this DVD medium M was inserted (mounted) in the power-on state before or before. The password entered at the time of user authentication (on operation) becomes the specific password.

  In step S115, the control unit 20 sets the DVD operation mode to the unlimited mode and ends the flow. Thereafter, the control unit 20 causes the DVD playback unit 25 to operate without restriction in accordance with a user operation. That is, when the DVD medium M is not inserted into the disk slot 3 at the time of the ON operation, the user freely performs various operations such as loading, reproduction, and ejection of the DVD medium M with respect to the DVD reproduction unit 25. Can be made.

  On the other hand, when the DVD medium M is inserted in the disk slot 3 in step S113 and the process proceeds to step S116, the control unit 20 specifies that the personal identification number input in step S108 is stored in the storage unit 21. It is determined whether the password is a password for manager or a password for manager to which a manager flag is added. If it is the specific password or the administrator password, the process proceeds to step S117. If it is neither the specific password nor the administrator password, the process proceeds to step S118.

  If the input password is the specific password or the administrator password and the process proceeds to step S117, the control unit 20 instructs the DVD playback unit 25 to insert it into the disk slot 3. The reproduction of the DVD medium M is started, and the process proceeds to step S115. In step S115, the control unit 20 sets the DVD operation mode to the unlimited mode and ends the flow. As a result, an image (DVD image) based on the image information reproduced by the DVD reproduction unit 25 is projected from the image projection unit 10. Thereafter, the user can freely cause the DVD playback unit 25 to perform various operations such as ejection of the DVD medium M and loading and playback of the new DVD medium M.

  As described above, when the user who has received the user authentication is an administrator, the DVD medium M inserted into the disk slot 3 at the time of the ON operation can be played back or ejected. Even if the user who has received the user authentication is not an administrator, if the entered personal identification number matches the specific personal identification number stored in the storage unit 21, the user is in the disk slot 3. Since the user is assumed to be a user who inserted the DVD medium M (or a user who belongs to the same user group as the user who inserted the DVD medium M), the inserted DVD medium M is played back or ejected. Is allowed.

  If the input password is different from both the specific password and the administrator password, and the process proceeds to step S118, the control unit 20 reads the security level information stored in the storage unit 21, and It is determined whether or not the set security level is a security level permitting the reproduction of the DVD medium M inserted at the time of the on operation. If the security level permits the reproduction of the DVD medium M, the process proceeds to step S119. If the security level does not permit the reproduction of the DVD medium M, the process proceeds to step S121.

  When the set security level is a security level permitting the reproduction of the DVD medium M and the process proceeds to step S119, the control unit 20 instructs the DVD reproduction unit 25 to be inserted into the disk slot 3. The reproduction of the DVD medium M is started, and the process proceeds to step S120. In step S120, the control unit 20 sets the DVD operation mode to the ejection prohibition mode and ends the flow. As described above, when the ejection prohibit mode is set, the control unit 20 ignores the operation and does not eject the DVD medium M even if the user operates the eject key of the main body operation unit 22 or the remote controller 23. That is, after that, the user can reproduce the DVD medium M and view the image, but cannot eject the DVD medium M.

  On the other hand, when the set security level is a security level that does not permit the reproduction of the DVD medium M and the process proceeds to step S121, the control unit 20 sets the DVD operation mode to the operation prohibition mode and ends the flow. To do. As described above, when the operation prohibit mode is set, the control unit 20 ignores the operation and reproduces the DVD medium M even if the user operates the reproduction key or the eject key of the main body operation unit 22 or the remote controller 23. Do not let them eject or eject. In other words, after that, the user cannot reproduce and eject the inserted DVD medium M.

  Since the projector 1 operates as described above, the user can shift the projector 1 to the power-on state by operating the power key or the playback key in the standby state. When the user authentication function is invalid, if the DVD medium M is inserted in the disk slot 3, the reproduction is automatically started, and the projector 1 can be used thereafter.

  On the other hand, when the user authentication function is valid, user authentication is performed using a personal identification number, and when user authentication is established, the projector 1 can be used thereafter. However, when the DVD medium M is inserted into the disk slot 3 during the ON operation, the entered password is either the administrator password or the password (specific password) when the DVD medium M is inserted. If they are different from each other, the operation of the DVD playback unit 25 is restricted. The operation restriction of the DVD playback unit 25 includes an ejection prohibition mode for prohibiting ejection of the DVD medium M and an operation prohibition mode for prohibiting playback and ejection of the DVD medium M, depending on the security level set by the user. To select one of the modes. Even when the operation of the DVD playback unit 25 is restricted, it is possible to project an image based on the image information input from the image supply device C to the image information input unit 31.

  6 and 7 are flowcharts for explaining the operation of the projector 1 when the eject key is operated in the standby state. When the user operates the eject key in the standby state, the control unit 20 operates according to the flow shown in FIGS. Note that steps S105 and S117 in FIGS. 3 and 4 are replaced with steps S205 and S217, respectively, and there are no steps corresponding to step S119, and the flow in FIGS. 3 and 4 and FIGS. The flow of is the same.

  As shown in FIG. 6, in step S <b> 201, the control unit 20 instructs the power supply circuit 34 to start supplying operating power to each unit, and shifts the projector 1 to the power-on state. In step S202, the control unit 20 instructs the light source control unit 35 to turn on the light source 11 so that an image can be projected.

  In step S <b> 203, the control unit 20 determines whether or not the user authentication function is valid based on the authentication flag stored in the storage unit 21. If the user authentication function is invalid, the process proceeds to step S204. If the user authentication function is valid, the process proceeds to step S207.

  When the user authentication function is invalid and the process proceeds to step S204, the control unit 20 determines whether the DVD medium M is mounted on the turntable based on the detection result of the mounting sensor 28, that is, the DVD medium in the disk slot 3. It is determined whether or not M is inserted. If the DVD medium M is inserted, the process proceeds to step S205. If the DVD medium M is not inserted, the process proceeds to step S206.

  When the DVD medium M is inserted in the disk slot 3 and the process proceeds to step S205, the control unit 20 instructs the DVD playback unit 25 to eject the inserted DVD medium M by the media transport unit 27. Let In step S206, the control unit 20 sets the DVD operation mode to the unlimited mode and ends the flow. Thereafter, the user can use the DVD playback unit 25 without limitation.

  When the user authentication function is valid in step S203 and the process proceeds to step S207, the control unit 20 instructs the OSD processing unit 33 to display the authentication image W1 for prompting the input of the password on the projected image. (See FIG. 5). In step S208, the control unit 20 receives an input of a personal identification number by the user.

  In step S209, the control unit 20 performs an authentication process based on the password entered by the user. Then, when the entered password matches the regular password, user authentication is established.

  In step S210, the control unit 20 determines whether user authentication has been established based on the result of the authentication process in step S209. If the user authentication is established, the control unit 20 causes the OSD processing unit 33 to finish superimposing the authentication image W1, and then proceeds to step S213 (see FIG. 7). On the other hand, if the user authentication is not established, the process proceeds to step S211.

  When the user authentication is not established and the process proceeds to step S211, the control unit 20 instructs the light source control unit 35 to turn off the light source 11. In step S212, the control unit 20 instructs the power supply circuit 34 to stop supplying the operating power to each unit, shift the projector 1 to the standby state, and end the flow. As described above, when the user authentication is not established, the power-on state of the projector 1 is not continued, and the user cannot use the projector 1.

  On the other hand, as shown in FIG. 7, when the user authentication is established and the process proceeds to step S213, the control unit 20 determines whether the DVD medium M is mounted on the turntable based on the detection result of the mounting sensor 28. It is determined whether or not the DVD medium M is inserted in the disk slot 3. If the DVD medium M is inserted, the process proceeds to step S216. If the DVD medium M is not inserted, the process proceeds to step S214.

  When the process proceeds to step S214 without inserting the DVD medium M, the control unit 20 stores the password entered in step S208 in the storage unit 21 as the specific password. In step S215, the control unit 20 sets the DVD operation mode to the unlimited mode and ends the flow. Thereafter, the control unit 20 causes the DVD playback unit 25 to operate without restriction in accordance with a user operation. That is, when the DVD medium M is not inserted into the disk slot 3 at the time of the ON operation, the user freely performs various operations such as loading, reproduction, and ejection of the DVD medium M with respect to the DVD reproduction unit 25. Can be made.

  On the other hand, when the DVD medium M is inserted in the disk slot 3 in step S213 and the process proceeds to step S216, the control unit 20 specifies that the personal identification number input in step S208 is stored in the storage unit 21. It is determined whether the password is a password for manager or a password for manager to which a manager flag is added. If it is the specific password or the manager password, the process proceeds to step S217. If it is neither the specific password nor the manager password, the process proceeds to step S218.

  When the input password is the specific password or the administrator password and the process proceeds to step S217, the control unit 20 instructs the DVD playback unit 25 to insert it into the disk slot 3. The DVD medium M is ejected, and the process proceeds to step S215. In step S215, the control unit 20 sets the DVD operation mode to the unlimited mode and ends the flow. Thereafter, the user can freely cause the DVD playback unit 25 to perform various operations such as loading, playback, and ejection of a new DVD medium M.

  As described above, when the user who has received the user authentication is an administrator, the DVD medium M inserted in the disk slot 3 at the time of the ON operation is ejected, or a new DVD medium M is inserted and played back. can do. Even if the user who has received the user authentication is not an administrator, if the entered personal identification number matches the specific personal identification number stored in the storage unit 21, the user is in the disk slot 3. Since it is assumed that the user has inserted the DVD medium M (or a user belonging to the same user group as this user), the inserted DVD medium M is ejected or a new DVD medium M is inserted and played back. Allowed to do so.

  When the input password is different from both the specific password and the administrator password, and the process proceeds to step S218, the control unit 20 reads the security level information stored in the storage unit 21, It is determined whether or not the set security level is a security level permitting the reproduction of the DVD medium M inserted at the time of the on operation. If the security level permits the reproduction of the DVD medium M, the process proceeds to step S219. If the security level does not permit the reproduction of the DVD medium M, the process proceeds to step S220.

  When the process proceeds to step S219, the control unit 20 sets the DVD operation mode to the ejection prohibition mode and ends the flow. As described above, when the ejection prohibit mode is set, the control unit 20 ignores the operation and does not eject the DVD medium M even if the user operates the eject key of the main body operation unit 22 or the remote controller 23. That is, after that, the user can reproduce the DVD medium M and view the image, but cannot eject the DVD medium M.

  On the other hand, if the set security level is a security level that does not permit the reproduction of the DVD medium M and the process proceeds to step S220, the control unit 20 sets the DVD operation mode to the operation prohibition mode and ends the flow. To do. As described above, when the operation prohibit mode is set, the control unit 20 ignores the operation and reproduces the DVD medium M even if the user operates the reproduction key or the eject key of the main body operation unit 22 or the remote controller 23. Do not let them eject or eject. In other words, after that, the user cannot reproduce and eject the inserted DVD medium M.

  Since the projector 1 operates as described above, the user can shift the projector 1 to the power-on state by operating the eject key in the standby state. When the user authentication function is invalid, if the DVD medium M is inserted in the disk slot 3, it is ejected, and the projector 1 can be used thereafter.

  On the other hand, when the user authentication function is valid, user authentication is performed using a personal identification number, and when user authentication is established, the projector 1 can be used thereafter. However, when the DVD medium M is inserted into the disk slot 3 during the ON operation, the entered password is either the administrator password or the password (specific password) when the DVD medium M is inserted. If they are different from each other, the operation of the DVD playback unit 25 is restricted. The operation restriction of the DVD playback unit 25 includes an ejection prohibition mode for prohibiting ejection of the DVD medium M and an operation prohibition mode for prohibiting playback and ejection of the DVD medium M, depending on the security level set by the user. To select one of the modes. Even when the operation of the DVD playback unit 25 is restricted, it is possible to project an image based on the image information input from the image supply device C to the image information input unit 31.

  FIG. 8 is a flowchart for explaining the operation of the projector 1 when the DVD medium M is inserted into the disk slot 3 in the standby state. When the DVD medium M is inserted by the user in the standby state and the insertion sensor 26 detects this, the control unit 20 operates according to the flow shown in FIG.

  As shown in FIG. 8, in step S301, the control unit 20 determines whether or not the DVD medium M is mounted on the turntable based on the detection result of the mounting sensor 28, that is, another DVD medium M in the disk slot 3. It is determined whether or not is inserted. If another DVD medium M is inserted, the flow is terminated in the standby state, and if another DVD medium M is not inserted, the process proceeds to step S302. As described above, when another DVD medium M is already inserted, even if the DVD medium M is inserted, the power is not turned on. For this reason, in this case, the user shifts to the power-on state by operating the eject key, ejects the inserted DVD medium M, and then inserts a new DVD medium M. That's fine.

  When no other DVD medium M is inserted in the disk slot 3 and the process proceeds to step S302, the control unit 20 instructs the power supply circuit 34 to start supplying operating power to each unit, and the projector 1 is shifted to the power-on state. In step S303, the control unit 20 instructs the light source control unit 35 to turn on the light source 11 so that an image can be projected.

  In step S304, the control unit 20 instructs the DVD playback unit 25 to transport (load) the inserted DVD medium M by the media transport unit 27 and mount it on the turntable.

  In subsequent step S <b> 305, the control unit 20 determines whether or not the user authentication function is valid based on the authentication flag stored in the storage unit 21. When the user authentication function is invalid, the process proceeds to step S306, and when the user authentication function is valid, the process proceeds to step S308.

  If the user authentication function is invalid and the process proceeds to step S306, the control unit 20 instructs the DVD playback unit 25 to start playback of the inserted DVD medium M. As a result, a DVD image is projected from the image projection unit 10. In step S307, the control unit 20 sets the DVD operation mode to the unlimited mode and ends the flow. Thereafter, the user can use the DVD playback unit 25 without limitation.

  On the other hand, when the user authentication function is valid and the process proceeds to step S308, the control unit 20 instructs the DVD playback unit 25 to eject the inserted DVD medium M by the media transport unit 27.

  In step S309, the control unit 20 instructs the OSD processing unit 33 to superimpose and display the authentication image W1 (see FIG. 5) on the projection image. In step S310, the control unit 20 receives an input of a personal identification number by the user.

  In step S311, the control unit 20 performs authentication processing based on the password entered by the user, and in step S312, the control unit 20 determines whether or not user authentication has been established. When the user authentication is established, the control unit 20 causes the OSD processing unit 33 to finish superimposing the authentication image W1, and then proceeds to step S307. When the user authentication is not established, the control unit 20 proceeds to step S313. Transition.

  When the user authentication is established and the process proceeds to step S307, the control unit 20 sets the DVD operation mode to the unlimited mode and ends the flow. Thereafter, the control unit 20 causes the DVD playback unit 25 to operate without limitation in accordance with a user operation. For example, when the user inserts the DVD medium M ejected in step S308 into the disc slot 3 again, the control unit 20 instructs the DVD playback unit 25 to insert the newly inserted DVD medium M into the media. It is loaded by the transport unit 27 and attached to the turntable. Then, the DVD player 25 is instructed to start playback of the inserted DVD medium M.

  On the other hand, when the user authentication is not established and the process proceeds to step S313, the control unit 20 instructs the light source control unit 35 to turn off the light source 11. In step S314, the control unit 20 instructs the power supply circuit 34 to stop supplying the operating power to each unit, shift the projector 1 to the standby state, and end the flow.

  Since the projector 1 operates as described above, when the DVD medium M is not mounted on the turntable in the standby state, the user turns on the projector 1 by inserting the DVD medium M into the disk slot 3. The state can be changed. When the user authentication function is invalid, the reproduction of the inserted DVD medium M is automatically started and the projector 1 can be used thereafter. In this embodiment, for the sake of simplicity, when it is determined in step S305 that the user authentication function is invalid, the DVD operation mode is changed to the unrestricted mode after the reproduction of the DVD medium M is started (step S306). Although the example of setting (step S307) has been shown, the DVD operation mode may be set to the unlimited mode before the reproduction of the DVD medium M is started.

  On the other hand, when the user authentication function is valid, the reproduction of the DVD medium M is not started and the DVD medium M is ejected, and the user authentication process based on the password is performed. Then, only when this user authentication is established, the projector 1 can be used thereafter. When the user authentication is not established, the projector 1 shifts to a standby state, and thus the projector 1 cannot be used. .

  Although not shown, registration of a new password (stored in the storage unit 21 as a regular password), addition of an administrator flag to the registered password, setting of an authentication flag and a security level, etc. Can be set (changed) from an environment setting menu displayed when the menu key of the main body operation unit 22 or the remote controller 23 is operated. As described above, these setting operations are permitted only to a user (administrator) who has achieved user authentication by inputting the administrator password.

  As described above, according to the projector 1 of the present embodiment, the following effects can be obtained.

  (1) According to the projector 1 of the present embodiment, any of the personal identification number (specific personal identification number) input when the DVD medium M is loaded in the DVD playback unit 25 and the personal identification number for the administrator at the time of user authentication. If a different password is entered, the control unit 20 restricts the operation of the DVD playback unit 25 even when user authentication is established and use of the projector 1 is permitted. For this reason, even if the DVD medium M is left in the DVD playback unit 25, it is possible to prevent the DVD medium M from being handled by other users.

  (2) According to the projector 1 of the present embodiment, the control unit 20 prohibits the ejection of the DVD medium M when a password different from both the specific password and the administrator password is input during user authentication. Therefore, even if the DVD medium M is left in the DVD playback unit 25, it can be prevented that another user takes out the DVD medium M.

  (3) According to the projector 1 of the present embodiment, when a personal identification number different from both the specific personal identification number and the administrator personal identification number is input at the time of user authentication, the control unit 20 depends on the set security level. Since the reproduction of the image information is prohibited, it is possible to prevent the image information from being reproduced and viewed by other users even if the DVD reproduction unit 25 is left with the DVD medium M mounted. .

  In the present embodiment, the control unit 20 when executing the authentication process in step S109 (see FIG. 3), step S209 (see FIG. 6), or step S311 (see FIG. 8) corresponds to the authentication unit. Further, the password entered by the user corresponds to the authentication information, the regular password stored in the storage unit 21 corresponds to the verification information, and the administrator password stored in the storage unit 21 (management The personal identification number with the person flag added corresponds to the manager verification information. In addition, the remote controller 23 that receives the input of the personal identification number corresponds to the input unit.

(Modification)
Moreover, you may change the said embodiment as follows.

  In the above embodiment, a configuration including the DVD playback unit 25 capable of reading information recorded on the DVD medium M is shown. However, instead of the DVD playback unit 25, an optical disc other than a DVD (for example, a Blu-ray disc) ), Image reproducing means capable of reading information recorded on other recording media such as various semiconductor memories, magnetic disks, magnetic tapes, and the like.

  In the above embodiment, the user authentication is performed using the personal identification number. However, the authentication information is not limited to the personal identification number, and authentication may be performed using a password including alphabetic characters or symbols as authentication information. Alternatively, it may be a requirement for authentication to operate various function keys provided in the main body operation unit 22 and the remote controller 23 in a predetermined order (sequence). Various authentication methods such as biometric authentication including fingerprint authentication can also be used.

  In the above embodiment, when the DVD medium M is shifted to the power-on state by inserting it into the disk slot 3, the inserted DVD medium M is ejected before user authentication (step S308). It is not limited to an aspect. For example, the inserted DVD medium M may be left mounted on the turntable and ejected when user authentication is not established. Further, until the user authentication is established, the inserted DVD medium M may be ejected without being mounted on the turntable.

  In the above embodiment, a slot-in method in which the DVD medium M is directly inserted into the disk slot 3 is adopted as a method for mounting the DVD medium M in the DVD reproducing unit 25. However, the DVD reproducing unit 25 is a slot-in method. For example, a tray loading method in which the DVD medium M is placed on the tray and conveyed may be employed. It is also possible to adopt a top loading method in which the user opens the open / close lid that covers the turntable and the DVD media M is directly mounted on the turntable by the user. In the case of the top loading method, it is necessary to open the opening / closing lid when ejecting (ejecting) the DVD medium M. To prohibit the ejection of the DVD medium M, it is necessary to prohibit the opening / closing operation of the opening / closing lid. Good.

  In the above-described embodiment, the transmissive liquid crystal light valves 12R, 12G, and 12B are used as the light modulator, but a reflective light modulator such as a reflective liquid crystal light valve can also be used. In addition, it is possible to use a micromirror array device that modulates light emitted from a light source by controlling the emission direction of incident light for each micromirror as a pixel.

  In the above embodiment, the light source 11 is configured by the discharge-type light source lamp 11a, but a solid light source such as an LED (Light Emitting Diode) light source or other light sources may be used.

  In the above-described embodiment, the projector 1 that modulates and projects the light emitted from the light source 11 is described as an example of the image display device. However, a rear projector that integrally includes a transmissive screen, or The present invention can also be applied to other image display devices such as a liquid crystal display, a plasma display, an SED (Surface-conduction Electron-emitter Display), and an organic EL (Electro Luminescence) display.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 2 ... Housing, 2f ... Front, 2t ... Upper surface, 3 ... Disc slot, 10 ... Image projection part, 11 ... Light source, 11a ... Light source lamp, 11b ... Reflector, 12R, 12G, 12B ... Liquid crystal light valve DESCRIPTION OF SYMBOLS 13 ... Projection lens, 14 ... Light valve drive part, 20 ... Control part, 21 ... Memory | storage part, 22 ... Main body operation part, 23 ... Remote control, 24 ... Operation signal receiving part, 25 ... DVD reproduction part, 26 ... Insertion sensor , 27 ... Media transport unit, 28 ... Mounting sensor, 29 ... Data reading unit, 30 ... Data processing unit, 31 ... Image information input unit, 32 ... Image processing unit, 33 ... OSD processing unit, 34 ... Power supply circuit, 35 ... Light source controller, C ... image supply device, M ... DVD media, SC ... screen, W1 ... authentication image.

Claims (11)

An image reproduction unit for reproducing image information recorded on the attached recording medium;
An image display unit for displaying an image based on the image information;
An input unit that accepts input of authentication information for user authentication;
A storage unit for storing a plurality of pieces of collation information to be collated with the authentication information;
An authentication unit that compares the authentication information with the plurality of pieces of verification information, and establishes the user authentication when the authentication information matches any of the pieces of verification information;
Even when the authentication unit establishes the user authentication, when authentication information different from the authentication information input by the user authentication when the recording medium is mounted on the image reproduction unit is input A control unit that restricts the operation of the image reproduction unit;
An image display device comprising: The image display device according to claim 1,
When the authentication information different from the authentication information input by the user authentication when the recording medium is mounted on the image reproduction unit is input to the control unit, the control unit reads the recording medium from the image reproduction unit. An image display device that prohibits ejection. The image display device according to claim 1 or 2,
The control unit prohibits reproduction of the image information when authentication information different from the authentication information input by user authentication when the recording medium is mounted on the image reproduction unit is input. A characteristic image display device. The image display device according to any one of claims 1 to 3,
As the operation restriction of the image reproducing unit, the first mode for prohibiting the ejection of the recording medium from the image reproducing unit, the ejection of the recording medium from the image reproducing unit, and the reproduction of the image information are prohibited. An image display device characterized in that the second mode for prohibiting the image can be selected. The image display device according to any one of claims 1 to 4,
The storage unit stores administrator verification information for identifying an administrator,
When the control information is inputted with authentication information different from both the authentication information inputted by the user authentication when the recording medium is mounted on the image reproduction unit and the collation information for manager, the image An image display device that restricts an operation of a reproduction unit. An image reproduction unit for reproducing image information recorded on the attached recording medium;
An image projection unit that projects an image based on the image information;
An input unit that accepts input of authentication information for user authentication;
A storage unit for storing a plurality of pieces of collation information to be collated with the authentication information;
An authentication unit that compares the authentication information with the plurality of pieces of verification information, and establishes the user authentication when the authentication information matches any of the pieces of verification information;
Even when the authentication unit establishes the user authentication, when authentication information different from the authentication information input by the user authentication when the recording medium is mounted on the image reproduction unit is input A control unit that restricts the operation of the image reproduction unit;
A projector characterized by comprising: A control method for an image display device comprising an image playback unit for playing back image information recorded on a mounted recording medium,
An input step for accepting input of authentication information for user authentication;
Authentication that verifies the authentication information input in the input step with a plurality of verification information stored in the image display device, and establishes the user authentication when the authentication information matches any verification information Steps,
Even when the user authentication is established in the authentication step, when authentication information different from the authentication information input in the user authentication when the recording medium is mounted on the image reproducing unit is input. , An operation limiting step for limiting the operation of the image reproduction unit;
An image display apparatus control method comprising: A control method for an image display device according to claim 7,
In the operation limiting step, when authentication information different from the authentication information input by user authentication when the recording medium is mounted on the image reproduction unit is input, the recording medium from the image reproduction unit A method of controlling an image display device, wherein the ejection of the image is prohibited. A control method for an image display device according to claim 7 or 8,
In the operation restriction step, the reproduction of the image information is prohibited when authentication information different from the authentication information input by the user authentication when the recording medium is mounted on the image reproduction unit is input. A control method for an image display device. A control method for an image display device according to any one of claims 7 to 9,
As the operation restriction of the image reproducing unit, the first mode for prohibiting the ejection of the recording medium from the image reproducing unit, the ejection of the recording medium from the image reproducing unit, and the reproduction of the image information are prohibited. A method for controlling an image display device, wherein a second mode for prohibiting the selection is selectable. It is the control method of the image display apparatus as described in any one of Claims 7-10,
The image display device stores administrator verification information for identifying an administrator,
In the operation limiting step, when authentication information that is input by user authentication when the recording medium is mounted on the image reproduction unit and authentication information that is different from any of the administrator verification information is input, A control method for an image display device, wherein the operation of an image reproduction unit is restricted.

Images