Abstract: A video display system for a meeting includes a video information terminal device typified by a liquid crystal projector, a video display unit typified by a whiteboard, a server which stores information and a user terminal (mobile terminal) held by a member of the meeting. A host of the meeting transmits information regarding the time of the meeting, members, and contents thereof to the server. A reservation list and a participant list are displayed and updated depending on an attendance/nonattendance answer from a member. A diagram or letters written on the whiteboard during the meeting are captured by the video information terminal device, inverted in brightness, stored in a memory, and displayed as a video image. At the end of the meeting, video data is stored as a file. When the meeting is resumed, the stored file is reproduced, developed in the memory, and displayed as a video image.

Abstract: A projection-type video display device which is easily radio-connected to a portable terminal and can freely switchably display video images sent from a plurality of portable terminals is provided. The projection-type video display device is directly connected to a portable terminal (2) by a radio transmission scheme without a relay station. The projection-type video display device (1) has a proximity communication unit (10) which transmits/receives device information of the projection-type display device (1) to/from the portable terminal, and the portable terminal (2) is put over or touched on the proximity communication unit (10) to transmit/receive the device information. The projection-type video display device has a radio signal input unit 20 which selects a desired portable terminal from the plurality of portable terminals and connects the selected portable terminal.

Abstract: A projection type image display device provided with an unauthorized use preventing system includes a button unit or a remote controller for operating the display device, a condition memory for storing information indicating at least one use condition in an authorized use of the display device, a password memory for storing a password for releasing a restriction on the use of the display device, a detector for detecting a used condition of the display device at a power on timing, and a processor for imposing restrictions on the use of the display device when the use condition detected by the detector does not match the at least one use condition indicated by the information stored in the condition memory and for relieving the restriction based upon input of the password.

Abstract: A video display system for a meeting includes a video information terminal device typified by a liquid crystal projector, a video display unit typified by a whiteboard, a server which stores information and a user terminal (mobile terminal) held by a member of the meeting. A host of the meeting transmits information regarding the time of the meeting, members, and contents thereof to the server. A reservation list and a participant list are displayed and updated depending on an attendance/nonattendance answer from a member. A diagram or letters written on the whiteboard during the meeting are captured by the video information terminal device, inverted in brightness, stored in a memory, and displayed as a video image. At the end of the meeting, video data is stored as a file. When the meeting is resumed, the stored file is reproduced, developed in the memory, and displayed as a video image.

Abstract: A projection type image display device provided with an unauthorized use preventing system includes a button unit or a remote controller for operating the display device, a condition memory for storing information indicating at least one use condition in an authorized use of the display device, a password memory for storing a password for releasing a restriction on the use of the display device, a detector for detecting a used condition of the display device at a power on timing, and a processor for imposing restrictions on the use of the display device when the use condition detected by the detector does not match the at least one use condition indicated by the information stored in the condition memory and for relieving the restriction based upon input of the password.

Abstract: A projection type image display device provided with an unauthorized use preventing system includes a button unit or a remote controller for operating the display device, a condition memory for storing information indicating at least one use condition in an authorized use of the display device, a password memory for storing a password for releasing a restriction on the use of the display device, a detector for detecting a used condition of the display device at a power on timing, and a processor for imposing restrictions on the use of the display device when the use condition detected by the detector does not match the at least one use condition indicated by the information stored in the condition memory and for relieving the restriction based upon input of the password.

Abstract: A projection type image display device provided with an unauthorized use preventing system includes a button unit or a remote controller for operating the display device, a condition memory for storing information indicating at least one use condition in an authorized use of the display device, a password memory for storing a password for releasing a restriction on the use of the display device, a detector for detecting a used condition of the display device at a power on timing, and a processor for imposing restrictions on the use of the display device when the use condition detected by the detector does not match the at least one use condition indicated by the information stored in the condition memory and for relieving the restriction based upon input of the password.

Abstract: A theft preventing system easy to operate and capable of implementing countermeasures to theft of a projection type image display device is provided. The projection type image display device is equipped with a unit for detecting a used condition of the device and a unit for registering a used condition of the device. By further equipping the device with a unit for inhibiting normal operations of the device in its used condition other than the registered condition, a simple and easy-to-operate unauthorized use preventing system can be realized and thus protection of the device against theft can be attained.

Abstract: A theft preventing system easy to operate and capable of implementing countermeasures to theft of a projection type image display device is provided. The projection type image display device is equipped with a unit for detecting a used condition of the device and a unit for registering a used condition of the device.