JP2014137513A - Projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection type display device that is capable of a quick projection after a lens is interchanged.SOLUTION: The projection type display device capable of interchanging a lens includes: a main body section; a lens unit that is mountable and demountable to and from the main body section; a lens cover that is attached to the main body section so as to protect the lens unit; a lens interchange detection section that detects an attachment/mounting and a detachment/demounting of the lens cover or the lens unit; and a control section that determines an attachment/mounting and detachment/demounting states of the lens cover or the lens unit on the basis of a signal from the lens interchange detection section. When it is determined that the lens cover or the lens unit is removed on the basis of the signal in a state where a power source of the projection type display device is turned on, the control section transitions a mode from a projection mode to a lens interchange mode.

Description

  The present invention relates to a projection display device in which a lens can be exchanged.

  Conventionally, a projection display device that displays an image on a screen via a projection lens (lens) has been used as a large-screen display device. The projection display device has an optimum projection distance, but the optimum projection distance may not always be ensured depending on the environment such as the installation location of the projection display device. Therefore, in order to project an image in accordance with the projection distance, a projection type display device capable of exchanging lenses is known. When such a projection display device is used, the user can select a lens having an appropriate focal length in accordance with the projection distance. Patent Documents 1 and 2 disclose a projection display device in which a lens can be exchanged.

JP 2003-107583 A JP 2004-302350 A

  However, in the conventional projection display device in which the lens can be replaced, it is necessary to turn off the power from the viewpoint of safety when the lens is replaced. For this reason, when it is necessary to change the lens after turning on the projection display device, it is necessary to turn off the power and then turn on the power again after completing the lens exchange. Take it.

  Therefore, the present invention provides a projection display device that can project quickly after lens replacement.

  A projection display device according to one aspect of the present invention is a projection display device in which a lens can be replaced, and the main body, a lens unit that can be attached to and detached from the main body, and the main body so as to protect the lens unit A lens cover attached to the lens, a lens exchange detection unit that detects attachment / detachment of the lens cover or the lens unit, and a state of attachment / detachment of the lens cover or the lens unit based on a signal from the lens exchange detection unit A control unit, and when the control unit determines that the lens cover or the lens unit is removed based on the signal in a state where the power of the projection display device is on, the lens exchange mode is changed from the projection mode. To move to.

  Other objects and features of the present invention are illustrated in the following examples.

  ADVANTAGE OF THE INVENTION According to this invention, the projection type display apparatus which can project rapidly after lens replacement | exchange can be provided.

1 is an external view of a projection display device according to Embodiment 1. FIG. 1 is a block diagram of a projection display device in Embodiment 1. FIG. 6 is a flowchart illustrating an operation at the time of lens replacement of the projection display device according to the first exemplary embodiment. It is a block diagram of the projection type display apparatus in Example 2. FIG. 6 is a flowchart illustrating an operation at the time of lens replacement of the projection display device according to the second exemplary embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the same members are denoted by the same reference numerals, and redundant description is omitted.

  First, with reference to FIG. 1, the external appearance of the projection type display apparatus in Example 1 of this invention is demonstrated. FIG. 1 is an external view of a projection display device 1 in this embodiment. In FIG. 1, reference numeral 100 denotes a main body of the projection display device 1. Reference numeral 200 denotes a lens unit (lens) that can be exchanged according to the application, and is configured to be detachable from the main body 100. Reference numeral 300 denotes a lens cover, which is attached to the main body 100 for user safety and protection of the lens unit 200. As described above, the projection display device 1 according to the present embodiment is a projection display device in which the lens can be replaced, and is configured to be able to replace the lens unit 200 by removing the lens cover 300.

  Then, with reference to FIG. 2, the structure of the projection type display apparatus 1 in a present Example is demonstrated. FIG. 2 is a block diagram of the projection display device 1. In FIG. 2, a video signal input unit 101 includes a video signal input interface connector, and inputs a video signal from an external device such as a personal computer. The video signal input to the video signal input unit 101 is output to the video processing unit 102.

  The video processing unit 102 performs various signal processing such as resolution conversion, trapezoidal correction, and image quality correction such as brightness, contrast, and color. The video processing unit 102 can also output a full-screen black video signal. When a full-screen black command is received from the MPU 107 described later, the full-screen black video signal is output regardless of the content of the input video signal. Video signal is output. The video signal output from the video processing unit 102 is input to the panel driving unit 103.

  The panel driving unit 103 drives the liquid crystal panels 104a, 104b, and 104c (a plurality of display elements) based on the input video signal. The liquid crystal panels 104a to 104c may be transmissive liquid crystal panels or reflective liquid crystal panels. In addition, other display elements can be used instead of the liquid crystal panel.

  The light source driving unit 105 performs light source driving such as keeping the power supplied to the light source 106 constant. The light source driving unit 105 controls turning on / off of the light source 106 based on a command from the MPU 107 described later. The light source 106 includes a mercury lamp, a light emitting diode (LED), a laser diode (LD), and the like. The light emitted from the light source 106 is split into red, green, and blue by the optical system 111 and guided to the liquid crystal panels 104a to 104c, respectively. The light guided to the liquid crystal panels 104 a to 104 c is image-modulated by the liquid crystal panels 104 a to 104 c and projected by the lens 201 in the lens unit 200.

  The MPU 107 (control unit) controls the video processing unit 102, the light source driving unit 105, the ROM 108, and the display unit 112. Further, the MPU 107 reads a user operation input to the operation unit 109 and performs an operation corresponding to the operation. The display unit 112 is a light emitting diode (LED), for example, and can control the display unit 112 by the MPU 107 to notify the user of the state of the projection display device 1. The ROM 108 stores various programs and settings.

  The lens replacement detection unit 110 is a switch that detects attachment / detachment of the lens cover 300. The MPU 107 can determine the attachment / detachment state of the lens cover 300 based on a signal from the lens replacement detection unit 110 (a detection signal of the lens replacement detection unit 110). The lens replacement detection unit 110 may be a switch that detects attachment / detachment of the lens unit 200 in place of the lens cover 300.

  Next, with reference to FIG. 3, an operation at the time of lens replacement of the projection display device 1 in the present embodiment will be described. FIG. 3 is a flowchart showing the operation of the projection display device 1 when the lens is replaced. Each step of FIG. 3 is mainly executed based on a command from the MPU 107 of the projection display device 1. The flowchart of FIG. 3 shows a case where the lens unit 200 is replaced in a state where the projection display device 1 is turned on (in the projection mode).

  First, in step S101, the lens replacement detection unit 110 monitors attachment / detachment of the lens cover 300 (or the lens unit 200). If the lens cover 300 is attached, step S101 is repeated (looped). On the other hand, when the lens cover 300 is removed, it is determined that the lens replacement is started, and the process proceeds to step S102.

  In step S102, the MPU 107 shifts from the projection mode to the lens exchange mode. The MPU 107 controls the light source driving unit 105 to turn off the light source 106 in the lens exchange mode. Further, the MPU 107 may control the display unit 112 in the lens exchange mode to notify the user that the lens exchange mode is currently set. In the lens exchange mode, the MPU 107 may control the video processing unit 102 so that the liquid crystal panels 104a to 104c display full screen black instead of turning off the light source 106. Further, when the optical system 111 is provided with a shutter and a shutter driving unit that controls the driving of the shutter, the MPU 107 may control the shutter to be closed in the lens exchange mode, or a combination thereof. You can also

  Subsequently, in step S103, the lens replacement detection unit 110 monitors the attachment / detachment of the lens cover 300. When the lens cover 300 is attached, the MPU 107 determines that the lens replacement is completed, and the process proceeds to step S104. On the other hand, if the lens cover 300 remains removed, the process proceeds to step S105.

  In step S104, the MPU 107 shifts from the lens exchange mode to the projection mode. At this time, the light source 106 is turned on and the display unit 112 is controlled to notify the user that it is not in the current lamp replacement mode (that is, the projection mode). That is, the MPU 107 shifts from the lens exchange mode to the projection mode when the lens exchange detection unit 110 detects that the lens cover 300 or the lens unit 200 is attached in the lens exchange mode. Then, this flow ends. In addition, when the display is set to black on the entire screen in the lens exchange mode, control is performed so as to return to the display based on the input video signal. Further, when the shutter is closed, control is performed so that the shutter is opened.

  On the other hand, if the lens cover 300 remains removed in step S103, time is counted in step S105 (time count). In step S106, the MPU 107 determines whether the count is within a predetermined value. If the count is within the predetermined value, it is determined that the lens is being replaced, and the process returns to step S103. On the other hand, when the count exceeds a predetermined value, the process proceeds to step S107. In step S107, the MPU 107 shifts from the lens exchange mode to the standby mode. That is, the MPU 107 shifts from the lens replacement mode to the standby mode when a predetermined time has elapsed in the lens replacement mode. Then, this flow ends.

  As described above, when the MPU 107 determines that the lens cover 300 or the lens unit 200 has been removed based on the signal from the lens replacement detection unit 110 while the power of the projection display device 1 is on, the lens replacement is performed from the projection mode. Switch to mode. In the lens exchange mode, for example, control is performed so that at least the light source 106 is turned off while the projection display apparatus 1 is turned on. However, the lens exchange mode is not limited to this, and the video processing unit 102 may be controlled to output a full screen black video signal with the projection display device 1 powered on. . In the lens exchange mode, the shutter drive unit may be controlled to close the shutter provided in the optical system 111 in a state where the power of the projection display device 1 is turned on.

  According to the present embodiment, since the lens can be exchanged in a state where the power of the projection display device is turned on, it is possible to provide a projection display device that can project quickly after the lens exchange.

  Next, with reference to FIG. 4, the structure of the projection type display apparatus 1 in a present Example is demonstrated. FIG. 4 is a block diagram of the projection display device 1a. The projection display device 1a is different from the projection display device 1 of the first embodiment in that in addition to the lens 201, the lens unit 200a includes a drive unit 202 and a lens ROM 203. Since other configurations are the same as those of the projection display device 1, their descriptions are omitted.

  A drive unit 202 for driving the lens 201 is provided inside the lens unit 200a. The drive unit 202 can drive the lens 201 by a control signal from the MPU 107 to adjust zoom and focus. A lens ROM 203 (storage unit) that stores various information of the lens unit 200a is provided inside the lens unit 200a. When there are a plurality of lens units 200a such as a short focus lens unit and a long focus lens unit, the lens ROM 203 stores adjustment values and identification codes of the plurality of lens units 200a. The lens ROM 203 can communicate with the MPU 107, and the MPU 107 can also read the adjustment value and identification code of the attached lens unit 200a.

  Next, with reference to FIG. 5, an operation at the time of lens replacement of the projection display device 1 a in this embodiment will be described. FIG. 5 is a flowchart showing the operation of the projection display device 1a when the lens is replaced. Each step of FIG. 5 is mainly executed based on a command from the MPU 107 of the projection display apparatus 1a. Note that the flowchart of FIG. 5 shows a case where the lens unit 200a is replaced in a state where the projection display device 1a is powered on (in the projection mode).

  First, in step S201, the lens replacement detection unit 110 monitors the attachment / detachment of the lens cover 300 (or the lens unit 200a). If the lens cover 300 is attached, step S201 is repeated (looped). On the other hand, when the lens cover 300 is removed, it is determined that the lens replacement is started, and the process proceeds to step S202.

  In step S202, the MPU 107 shifts from the projection mode to the lens exchange mode. The MPU 107 controls the light source driving unit 105 to turn off the light source 106 in the lens exchange mode. Further, the MPU 107 may control the display unit 112 in the lens replacement mode to notify the user that the current lamp replacement mode is set. In the lens exchange mode, the MPU 107 may control the video processing unit 102 so that the liquid crystal panels 104a to 104c display full screen black instead of turning off the light source 106. Further, when the optical system 111 is provided with a shutter and a shutter driving unit that controls the driving of the shutter, the MPU 107 may control the shutter to be closed in the lens exchange mode, or a combination thereof. You can also

  After shifting to the lens exchange mode, in step S203, the MPU 107 stops communication with the lens ROM 203 in order to protect the data in the lens ROM 203. Note that data backup may be performed as necessary. Subsequently, in step S204, the MPU 107 stops power supply to the drive unit 202 and the lens ROM 203 (lens unit 200a).

  Subsequently, in step S205, the lens replacement detection unit 110 monitors the attachment / detachment of the lens cover 300. When the lens cover 300 is attached, the MPU 107 determines that the lens replacement is completed, and the process proceeds to step S206. On the other hand, if the lens cover 300 remains removed, the process proceeds to step S210.

  In step S206, the MPU 107 resumes power supply to the drive unit 202 and the lens ROM 203 (lens unit 200a). In step S207, the MPU 107 resumes communication with the lens ROM 203. In step S208, the MPU 107 performs initialization in order to perform control in accordance with the lens unit 200a after replacement.

  Subsequently, in step S209, the MPU 107 shifts from the lens exchange mode to the projection mode. At this time, the light source 106 is turned on and the display unit 112 is controlled to notify the user that it is not in the current lamp replacement mode (that is, the projection mode). Then, this flow ends. In addition, when the display is set to black on the entire screen in the lens exchange mode, control is performed so as to return to the display based on the input video signal. Further, when the shutter is closed, control is performed so that the shutter is opened.

  On the other hand, if the lens cover 300 remains removed in step S205, time is counted in step S210 (time count). Subsequently, in step S211, the MPU 107 determines whether the count is within a predetermined value. If the count is within the predetermined value, it is determined that the lens is being replaced, and the process returns to step S205. On the other hand, when the count exceeds the predetermined value, the process proceeds to step S212. In step S212, the MPU 107 shifts from the lens exchange mode to the standby mode, and this flow ends.

  Thus, the lens unit 200a of the present embodiment includes the lens ROM 203 (storage unit) that can communicate with the main body unit 100. When the MPU 107 shifts from the projection mode to the lens exchange mode, the MPU 107 stops communication with the lens ROM 203 and then stops the power supply to the lens ROM 203. In addition, the lens unit 200 a includes a drive unit 202 that drives the lens 201. When the MPU 107 shifts from the projection mode to the lens exchange mode, the MPU 107 stops power supply to the drive unit 202.

  According to the present embodiment, since the lens can be exchanged in a state where the power of the projection display device is turned on, it is possible to provide a projection display device that can project quickly after the lens exchange. Further, according to the configuration of the present embodiment, it is possible to reliably protect the data in the lens ROM when the lens is replaced.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

1 Projection Display 100 Main Body 107 MPU
110 Lens exchange detection unit 200 Lens unit 300 Lens cover

Claims (10)

A projection display device with interchangeable lenses,
The main body,
A lens unit detachable from the main body,
A lens cover attached to the main body so as to protect the lens unit;
A lens replacement detection unit for detecting attachment or detachment of the lens cover or the lens unit;
A controller that determines whether the lens cover or the lens unit is attached or detached based on a signal from the lens replacement detector;
When the control unit determines that the lens cover or the lens unit is removed based on the signal with the projection display device turned on, the control unit shifts from the projection mode to the lens exchange mode. Projection type display device.   2. The projection type according to claim 1, wherein the control unit controls, as the lens replacement mode, at least a light source to be turned off in a state in which the power of the projection display device is turned on. Display device. A video processing unit that performs signal processing on the video signal;
The control unit controls the video processing unit to output a full screen black video signal in a state where the power of the projection display device is turned on as the lens exchange mode. 1. A projection display device according to 1. It further has an optical system that splits light emitted from the light source and guides it to a plurality of display elements
The optical system includes a shutter and a shutter driving unit that drives the shutter,
2. The projection according to claim 1, wherein the control unit controls the shutter driving unit to close the shutter while the power of the projection display device is turned on as the lens exchange mode. Type display device.   The control unit shifts from the lens exchange mode to the projection mode when the lens exchange detection unit detects that the lens cover or the lens unit is attached in the lens exchange mode. Item 5. The projection display device according to any one of Items 1 to 4.   The projection display device according to claim 1, wherein the lens replacement detection unit is a switch that detects attachment or detachment of the lens cover or the lens unit. A display unit;
The projection according to claim 1, wherein the control unit controls the display unit so as to notify a user that the lens replacement mode is currently in the lens replacement mode. Type display device.   The projection type display according to any one of claims 1 to 7, wherein the control unit shifts from the lens exchange mode to a standby mode when a predetermined time elapses in the lens exchange mode. apparatus. The lens unit has a storage unit that can communicate with the main body unit,
9. The control unit according to claim 1, wherein when the control unit shifts from the projection mode to the lens replacement mode, the control unit stops communication with the storage unit and then stops power supply to the storage unit. The projection display device according to any one of the above. The lens unit further includes a drive unit that drives the lens,
The projection display device according to claim 9, wherein the control unit stops power supply to the driving unit when the projection mode is shifted to the lens replacement mode.