JP2012047850A - Projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection type display device which has vibration isolation mechanism and achieves both operability and vibration isolation control.SOLUTION: An acceleration sensor (109) detects acceleration of vibration applied on a projector (100). A CPU (106) calculates displacement amount and a direction of the projector (100) from output of the acceleration sensor (109). When the displacement amount is a fixed value or more, the CPU (106) controls a lens shift part (112) to drive a shift lens (113) so as to counteract the displacement. Thus, a display position of a projection image on a projection surface is kept in a static state. When a user selects a mode of positioning of the projector (100) by an operation part (114), the CPU (106) turns off or weakens the vibration isolation operation.

Description

  The present invention relates to a projection display device having a vibration isolating means.

Japanese Patent Laid-Open No. 2001-221642 JP 2003-149729 A JP 2005-189733 A

  In recent years, projection display devices such as liquid crystal projectors have become widespread. A projection display device is a device that displays an enlarged image on a projection surface such as a screen and is suitable for presentations and video appreciation.

  As a place for installing such a projection type display device, a sturdy floor or table, a ceiling, or the like is preferable. However, if there are restrictions on the building or the environment and it is impossible to install the projection display device under such suitable conditions, the projection display device may be installed in a non-sturdy place.

  In recent years, projection type display devices that are small enough to be held with one hand are becoming popular. In the case of a hand-held projection display device, vibrations and camera shake applied to the main body greatly affect the visibility of the projected image. That is, if the main body vibrates, the projected image will vibrate according to the movement of the main body, and the viewer may feel uncomfortable by detecting the vibration or the resolution of the image may be reduced. Or perceive.

  Patent Document 1 discloses a technique for controlling the apex angle of a variable apex angle prism arranged on the exit side of a projection lens so that the position of a projection image does not change according to the detection result of an angular velocity detection unit that detects shake of the main body. Is described.

  Patent Document 2 describes a technique for detecting acceleration of vibration applied to the liquid crystal projector body from the outside and canceling the vibration by extending / contracting the leg, changing the position of the optical element, or changing the image display position of the image forming area. Has been.

  Patent Document 3 describes a shake correction technique for reducing the amount of movement of a projected image caused by shake on a projection surface based on a shake signal from a shake sensor that detects shake of a liquid crystal projector.

  In the related art, if the image stabilization control is applied strongly, there is a problem that the image projection position does not change due to the image stabilization control even when the projection display device is intentionally moved to finely adjust the projection position. If the anti-vibration strength is reduced to prevent this, the desired anti-vibration performance cannot be obtained.

  An object of the present invention is to present a projection display device that achieves both operability and a vibration isolation effect.

  In order to achieve the above object, a projection display device according to the present invention is a projection display device that projects and displays an image on a projection surface, and a projection unit that projects the image onto the projection surface; , A vibration detecting means for detecting vibration applied to the projection display device, and a change in a projection position of the image projected on the projection surface caused by the vibration based on a vibration amount detected by the vibration detecting means. And a control unit for controlling the image stabilization unit, wherein the operation mode selected by the mode selection unit is accompanied by movement of the projection display device. And a control unit that weakens the image stabilization operation by the image stabilization unit when in the mode.

  According to the present invention, the image stabilization control according to the usage state is performed. Thereby, the user can achieve both operability and image stabilization control.

It is a figure which shows the utilization form of one Example of this invention. It is a schematic block diagram of a present Example. It is operation | movement explanatory drawing of the vibration proof control of a present Example. It is a flowchart of the image stabilization control operation | movement of a present Example. It is a figure which shows the example of a menu display of a present Example. It is a figure explaining the vibration detection threshold value of a present Example. It is a figure which shows the operation state with respect to the liquid-crystal projector of a present Example. It is a flowchart of another image stabilization control operation | movement of a present Example. It is a figure which shows the projection example of the stack mode which applies the image stabilization control operation | movement shown in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a usage configuration example of a liquid crystal projector which is an embodiment of a projection type display apparatus according to the present invention.

  Reference numeral 100 denotes a liquid crystal projector of this embodiment. The liquid crystal projector 100 projects an image according to video data held inside or externally input video data onto the screen 1. Reference numeral 2 denotes a projected image. 3 is a user's hand, and 4 is an installation stand. As described above, the liquid crystal projector 100 projects an image while being held by the user or installed on the installation table 4.

  FIG. 2A shows a schematic block diagram of the liquid crystal projector 100. Reference numeral 101 denotes a video input terminal, 102 denotes an AD converter, 103 denotes a video processing unit, and 104 denotes a liquid crystal driver. Reference numeral 105 denotes a power button. 106 is a CPU (Central Processing Unit) for controlling the entire liquid crystal projector 100, 107 is a ROM (Read Only Memory), and 108 is a RAM (Random Access Memory). Reference numeral 109 denotes an acceleration sensor as vibration detection means, 110 a light source, 111 a liquid crystal panel, 112 a lens shift unit, 113 a shift lens, and 114 an operation unit.

  An operation in which the liquid crystal projector 100 projects and displays an image corresponding to a video signal input to the video input terminal 101 on a screen will be described.

  A video signal is input to the video input terminal 101 via a video cable (not shown). The AD converter 102 converts the input video signal into a digital video signal. Sampling parameters (frequency, phase, etc.) for the AD conversion are set in advance by the CPU 106. When the input video signal is a digital video signal, the AD converter 102 is unnecessary. The AD converter 102 supplies the digital video signal to the video processing unit 103. It is also possible to supply the digital video signal stored in the ROM 107 or the RAM 108 to the video processing unit 103.

  FIG. 2B is a schematic block diagram of the video processing unit 103. In FIG. 2B, 120 is a resolution conversion circuit, 121 is a video adjustment circuit, and 122 is an OSD circuit. The resolution conversion circuit 120 performs enlargement / reduction and clipping processing on the video signal input to the video processing unit 103, and converts the resolution at the time of input to the resolution of a liquid crystal panel described later. The video adjustment circuit 121 performs various video adjustments such as contrast, brightness, sharpness, and gamma correction on the video signal from the resolution conversion circuit 120. The video signal output from the video adjustment circuit 121 is input to an OSD (On Screen Display) circuit 122.

  The OSD circuit 122 superimposes the OSD image on the video signal output from the video adjustment circuit 121. The OSD image is an image including information that should be notified to the user, such as a menu and input signal status described later. The CPU 106 sets video adjustment parameters and OSD images in the resolution conversion circuit 120 and the video adjustment circuit 121. The CPU 106 also controls the operation of the video processing unit 103.

  The liquid crystal driver 104 converts the video signal output from the video processing unit 103 into a signal suitable for driving the liquid crystal panel 111.

  The liquid crystal panel 111 is a panel configured by arranging liquid crystal pixels in a matrix, and forms an image based on an input signal. The light source 110 generates illumination light that is a source of projection image light. The illumination light emitted from the light source 110 is converted into a parallel light beam by an illumination optical system (not shown) and enters the liquid crystal panel 111. The liquid crystal panel 111 modulates the intensity of illumination light from the light source 110 with the formed image. The illumination light modulated by the liquid crystal panel 111 is projection image light that conveys an image formed by the liquid crystal panel 111, and is projected to the outside by the shift lens 113 and a projection optical system (not shown).

  The lens shift unit 112 is an actuator that changes the position of the shift lens 113 in accordance with an instruction from the CPU 106. The lens shift unit 112 can change the position of the shift lens 113 on a plane perpendicular to the optical axis of the illumination light transmitted through the liquid crystal panel 111 (that is, the vertical direction in FIG. 2A and the direction perpendicular to the paper surface). It is. In accordance with the position change of the shift lens 113, the optical path of the projection image light to be projected is changed, and the projection image on the projection surface moves in a plane perpendicular to the optical axis. Further, instead of the shift lens 113, another member that can similarly change the optical path and shift the projection image may be used.

  The power button 105 is an operation member that receives instructions for starting and ending the liquid crystal projector 100 based on a button pressed by the user. This instruction is input to the CPU 106.

  The CPU 106 manages the activation and termination of the liquid crystal projector 100 and controls each unit such as the light source 110, the AD converter 102, and the video processing unit 103, and performs seismic control described later.

  The acceleration sensor 109 measures the acceleration applied to the liquid crystal projector 100 for one or more axes, and notifies the CPU 106 of the measurement result.

  The ROM 107 stores codes and data for operating the CPU 106. The RAM 108 serves as a work area for operating the CPU 106. It is also possible to store digital video signals in the ROM 107 and the RAM 108.

  The image stabilization control operation of this embodiment will be described. Preventing or reducing the vibration of the display image even when the liquid crystal projector 100 is held by hand, when the installed installation base 4 has insufficient rigidity, or when a vibration source is present in the vicinity. it can. With reference to FIG. 3, the image stabilization operation of the present embodiment will be described. FIG. 3 shows how the display position of the projected image is maintained even when the liquid crystal projector 100 is moved in the horizontal direction perpendicular to the projection direction by vibration.

  As shown in FIG. 3, it is assumed that the liquid crystal projector 100 is displaced by a displacement amount x from the position shown in FIG. 3A to the position shown in FIG. The CPU 106 calculates the displacement amount and direction by performing operations such as filtering and integration on the measured acceleration value measured by the acceleration sensor 109. When the displacement amount x is smaller than the predetermined vibration detection threshold value xt, that is, when x <xt, the CPU 106 considers the vibration to be canceled and starts the image stabilization control. When the displacement amount x is equal to or greater than the vibration detection threshold value xt, that is, x ≧ xt, the CPU 106 considers that the liquid crystal projector 100 has been intentionally moved and does not start the image stabilization control.

  In the image stabilization control, the CPU 106 calculates the movement amount y and the direction of the shift lens 113 so as to cancel the shift of the projected image on the projection surface based on the displacement amount x and the direction, and moves the movement to the lens shift unit 112. Indicate quantity and direction. The lens shift unit 112 moves the shift lens 113 in the movement amount and direction designated by the CPU 106. By changing the position of the shift lens 113, the optical path of the projected image is changed, and the display position of the projected image on the projection surface is maintained. That is, regardless of the displacement of the liquid crystal projector 100, the display image 2 is stationary or almost stationary. The lens shift unit 112 and the shift lens 113 function as an anti-vibration unit that reduces a change in the projection position of the projection image caused by vibration applied to the projector 100.

  By repeatedly performing the above-described processing in a minute time, even if the liquid crystal projector 100 vibrates, the projected image on the screen 1 is at the same position as that when it does not vibrate. Even if the liquid crystal projector 100 vibrates, the viewer feels less uncomfortable and less sense of resolution.

  The CPU 106 can control the vibration detection sensitivity and strength by controlling the vibration detection threshold value xt of the liquid crystal projector 100 and the movement amount y of the shift lens 113. In this embodiment, the CPU 106 controls the vibration detection threshold value xt according to the projection mode.

  FIG. 4 shows a flowchart of an operation in which the CPU 106 controls the vibration detection threshold according to the projection mode.

  In step S <b> 401, the CPU 106 determines whether operation information for the operation unit 114 has been received. When the operation information is received (the operation is performed), the process proceeds to step S402. When the operation information is not received, the loop state is maintained until the operation information is received.

  In step S402, the CPU 106 changes the mode of the liquid crystal projector 100 in accordance with the received user operation. The operation unit 114 functions as a mode selection unit that selects an operation mode of the projector 100. The liquid crystal projector 100 has an image display mode for projecting an input image, a menu display mode for displaying menus and making various settings of the liquid crystal projector 100, and an adjustment mode for automatically adjusting focus, color, and the like.

  In step S403, the CPU 106 determines whether or not the menu display mode is entered by the mode transition in step S402. An example of the projected image in the menu display mode is shown in FIG. In the menu display mode, menu images of various settings of the liquid crystal projector 100 are displayed as shown in FIG. 5, and the user operates the operation unit 114 while confirming the projected menu display.

  In the case of the menu display mode, the process proceeds to step S404, and in the other mode, the process proceeds to step S406.

  In step S404, CPU 106 determines whether the operation button of the liquid crystal projector main body has been operated directly or by a remote controller (not shown). If the operation button of the liquid crystal projector main body is directly operated, the process proceeds to step S405, and if operated by the remote control, the process proceeds to step S406. In steps S405 and S406, the CPU 106 determines a vibration detection threshold value xt.

  FIG. 6 shows an example of the vibration detection threshold. FIG. 6A shows the vibration detection threshold value in the menu display mode, and FIG. 6B shows the standard vibration detection threshold value. xt_v0 is a standard value of the vibration detection threshold value in the vertical direction, and xt_h0 is a standard value of the vibration detection threshold value in the horizontal direction. In the menu display mode, the CPU 106 sets the vertical vibration detection threshold value xt_v to xt_v1 larger than the standard value xt_v0 (xt_v1> xt_v0). On the other hand, the CPU 106 sets the horizontal vibration detection threshold value xt_h to the same xt_h0 as in the standard state.

  In step S406, that is, in the case of remote control operation, the CPU 106 sets the vibration detection threshold value xt to the standard values xt_v0 and xt_h0 shown in FIG. 6B.

  The reason why the vibration detection threshold is made different between the direct operation (S405) and the remote control operation (S406) will be described. When the user directly operates the liquid crystal projector body in the menu display state, the vertical movement of the liquid crystal projector body increases. FIG. 7 shows this state. In FIG. 7, reference numeral 116 denotes an operation unit, and 701 denotes a user's finger. As shown in FIG. 7, when the user presses down the operation unit 116 of the liquid crystal projector 100 with the finger 701, a downward force is applied, and the vertical movement becomes larger than in the normal state. Therefore, the vibration detection threshold value xt_v in the vertical direction is increased, and control is performed so that the image stabilization is performed even for a large movement. On the other hand, when not in the menu display mode, a physical operation on the operation unit 116 is not performed, and thus a standard vibration detection threshold value determined as vibration in a normal state is adopted.

  After setting the vibration detection threshold value in steps S405 and 406, in step S407, the CPU 106 executes image stabilization control. That is, the CPU 106 calculates a movement amount y and direction of the shift lens 113 that cancels the detected camera displacement amount x (<xt), and instructs the lens shift unit 112 of the movement amount and direction. The lens shift unit 112 moves the shift lens 113 in the instructed movement amount and direction.

  As described above, in the present embodiment, since the image stabilization control is changed according to the projection mode, image stabilization according to the use case can be performed. This improves the operability of the liquid crystal projector.

  Although the preferred embodiments of the present invention have been described, the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the gist thereof.

  In the above embodiment, the vibration detection threshold is increased in the menu display mode. However, the mode for controlling the vibration detection threshold is not limited to the menu display mode. In order to prevent vibration, it is effective to increase the vibration detection threshold for a mode in which a direct operation is requested to the operation unit 114.

  The vibration detection threshold value may be changed according to the attachment position of the operation unit 114. For example, when the operation unit 114 is attached to the side surface of the liquid crystal projector, the horizontal vibration detection threshold value xt_h is increased.

  This embodiment is particularly effective when the liquid crystal projector is held in hand, because the liquid crystal projector main body is largely moved by an operation on the operation unit 114. Therefore, it may be determined whether the handheld state or the stationary state, and the above-described image stabilization control may be validated only when the handheld state is held. Whether it is a hand-held state or a stationary state can be determined from the vibration behavior during image projection. In general, it is expected that the amount of vibration will be larger when handheld.

  A second embodiment of the present invention will be described with reference to FIGS. In this embodiment, the image stabilization is controlled on / off depending on whether or not the stack projection mode is set.

  FIG. 8 is a flowchart of this embodiment for controlling the image stabilization according to the projection mode, and is executed by the CPU 106.

  In step S <b> 801, the CPU 106 determines whether operation information for the operation unit 114 has been received. If the operation information is received (the operation is performed), the process proceeds to step S802. If the operation information is not received, the loop state is maintained until the operation information is received.

  In step S802, the CPU 106 transitions the mode of the liquid crystal projector according to the received user operation. In this embodiment, it is assumed that there are an image display mode for displaying an input image and a stack mode for performing stack projection described later as modes of the liquid crystal projector. There are two types of stack modes: a stack projection mode and a stack alignment mode.

  With reference to FIG. 9, the stack projection of the present embodiment will be described. Stack projection is a projection method in which one image is projected using two or more liquid crystal projectors. FIG. 9 shows a state in which two liquid crystal projectors 100 project the same image on the same position on the projection surface 1. FIG. 9A shows a state of image projection in the stack projection mode. In the stack projection mode shown in FIG. 9A, the two liquid crystal projectors communicate to change the setting of the video adjustment circuit 121 of the video processing unit 103 so that the luminance and color are the same. Then, the images adjusted by the two liquid crystal projectors are projected onto the same position on the projection surface. Since the same image is projected, it is necessary for the projection positions of the two liquid crystal projectors to be accurately matched, and a stack alignment mode for this purpose is provided.

  FIG. 9B shows a projection state in the stack alignment mode. In the stack alignment mode, the user supports the operation of aligning the projection position so that the projection images of the two liquid crystal projectors match. Specifically, as shown in FIG. 9B, a lattice-like image is displayed by two liquid crystal projectors, and the user physically adjusts the position and orientation of the two liquid crystal projectors to thereby provide two liquid crystal projectors. Adjust the projection angle of view of the projector.

  In step S803, the CPU 106 determines whether or not the stack mode is entered by the mode transition in step S802. If it is in the stack mode, the process proceeds to step S804. If it is not the stack mode (image display mode), the process proceeds to step S806.

  In step S804, the CPU 106 determines whether the stack alignment mode is set. If the stack alignment mode is entered, the process proceeds to step S805. If the stack projection mode is entered, the process proceeds to step S806.

  In step S804, the CPU 106 determines whether the stack alignment mode is set. In the stack alignment mode, the CPU 106 turns off the image stabilization control (S805). That is, the CPU 106 does not perform vibration detection and lens shift control based on the signal from the acceleration sensor 109. This is because if the image stabilization is enabled in the stack alignment mode, the alignment operation by the user is disturbed.

  In step S806, the CPU 106 performs normal image stabilization control. That is, as described in the first embodiment, the CPU 106 calculates the displacement amount x based on the output from the acceleration sensor 109, obtains the lens shift amount y that cancels the displacement amount x, and shifts the lens. However, the vibration detection threshold value xt for calculating the displacement amount x is set to be smaller than the normal projections xt_v0 and xt_h0. The reason why the vibration detection threshold value is made small is that, in this embodiment, hand-held stack projection is not assumed, so only minute vibrations that are supposed to occur on the installation base 4 are detected as vibrations.

  Although the embodiment in which the image stabilization control is turned off in the alignment mode in the stack projection has been described, turning off the image stabilization control is not limited to the stack alignment mode. For example, when there is a game mode in which the liquid crystal projector is operated by shaking, the image stabilization control is turned off in that mode. Similarly, the seismic control is also turned off in the alignment mode in the case of multi-projection in which one image is divided into two and divided and projected by two liquid crystal projectors.

Instead of turning off the anti-seismic control, the anti-vibration effect may be weakened. For example, the seismic effect can be weakened by making the vibration detection threshold value xt or the lens shift amount y smaller than in other modes. In addition, an imaging unit is provided in the liquid crystal projector 100, and whether or not images to be projected simultaneously on images in the projection direction imaged by the imaging unit are displayed separately is being aligned. It may be determined whether or not. For example, in the case of stack projection, the CPU 106 determines whether or not an image similar to the image projected by the projector is projected at a position away from the captured screen. In the case of multi-projection, the CPU 106 determines whether or not the remaining half of the image projected by the projector is projected at a distant position. In this way, when the user is away, it may be adjusted and the new protection level may be lowered or turned off.

Claims (5)

A projection display device that projects and displays an image on a projection surface,
Projecting means for projecting the image onto the projection surface;
Vibration detecting means for detecting vibration applied to the projection display device;
Based on the amount of vibration detected by the vibration detecting means, vibration preventing means for reducing a change in the projection position of the image projected on the projection surface caused by the vibration;
Mode selection means for selecting an operation mode;
Control means for controlling the image stabilization means, wherein the image stabilization operation by the image stabilization means is weakened when the operation mode selected by the mode selection means is a mode involving movement of the projection display device. A projection type display device.   The projection type display according to claim 1, wherein the mode accompanying the movement of the projection type display device includes any one of a mode for requesting a user operation and a mode for aligning the projection type display device. apparatus.   The projection type display device according to claim 1, wherein the control unit changes sensitivity of vibration detected by the vibration detection unit according to a mode selected by the mode selection unit.   4. The control unit according to claim 3, wherein when the mode selected by the mode selection unit is a mode that requires a user operation, the sensitivity of the vibration detection unit is changed so that a larger shake can be detected. The projection type display device described in 1.   The control means turns off the image stabilization operation by the image stabilization means when the operation mode selected by the mode selection means is a mode involving movement of the projection display device. Item 5. The projection display device according to any one of Items 1 to 4.

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