JP7070049B2 - Projector and projector control method - Google Patents

Description

The present invention relates to a projector that projects an image and a method for controlling the projector.

When a projector projects an image on a screen, a lens shift function that can adjust the projection position on the screen without moving the main body is known. For example, in the projector shown in Patent Document 1 below, the position of the projection lens is moved based on the user's operation to shift the optical axis of the projection lens from the original direction and change the projection position of the image on the screen. Can be done.

Japanese Unexamined Patent Publication No. 2011-227119

However, if you want to move the projection position of the image to the edge of the screen so that the edge of the image and the edge of the screen are close to each other, the projected image moves on the screen at a constant speed by the lens shift operation. Therefore, even when the user carefully performs the lens shift operation while gazing at the screen and the image, the edge of the image may come off the screen, and the convenience of the operation is impaired. Further, in a projector that forms an image with an optical modulation device such as a liquid crystal panel, the configuration for adjusting the projection position on the screen by changing the image formation position in the optical modulation device based on the user's operation is also described. Has a similar problem.
The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a projector having excellent convenience of lens shift operation.

The present invention has been made to solve at least a part of the above-mentioned problems, and can be realized as the following form or application example.

[Application Example 1]
The projector according to this application example has a light source that emits a first light, a modulation unit that generates a second light obtained by modulating the first light according to an image signal, and a projection lens. A display unit that displays a projected image on the projection surface by passing the second light through the projection lens, a detection unit that detects the end of the projection surface and the end of the projection image, and position adjustment for moving the projection lens. The unit, the operation receiving unit that accepts the operation of moving the projected image in the first direction, and the operation receiving unit so that the projected image moves in the first direction when the operation receiving unit accepts the operation. The position adjusting unit includes a control unit for moving the projection lens, and the control unit has an end portion of the projection surface and the control unit when the projection image is moved in the first direction by the operation. It is characterized in that when the distance between the ends of the projected image and the end of the projected image falls within the first range, the moving speed at which the projected image moves in the first direction is changed.

According to such a configuration, when the projector is moving the projection image projected on the projection surface in the first direction based on the operation received by the operation reception unit, the projector is the edge of the projection surface detected by the detection unit. When the distance between the ends of the portion and the end of the projected image falls within the first range, the moving speed of the projected image is changed. Therefore, when it is desired to bring the end portion of the projected image close to the end portion of the projection surface, the movement operation of the projected image can be carefully performed by changing the moving speed of the projected image, so that the convenience of the operation is improved.

[Application example 2]
In the projector according to the above application example, when the control unit moves the projection image in the first direction and the end portion of the projection image and the end portion of the projection surface overlap, the projection is performed. It is preferable to stop the movement of the image.

According to such a configuration, when the end of the moving projection image and the end of the projection surface overlap, the movement of the projection image is stopped, so that the projection image moves off the projection surface and the projection image is displayed. It is possible to avoid being displayed in a chipped manner.

[Application example 3]
In the projector according to the above application example, it is preferable that the control unit reduces the moving speed when the distance between the ends falls within the first range due to the movement of the projected image.

According to such a configuration, when it is desired to bring the end of the projected image close to the end of the projection surface, when the distance between the ends falls within the first range, the moving speed of the projected image is decelerated, so that the projection is performed. You can move the image accurately.

[Application example 4]
In the projector according to the above application example, it is preferable that the control unit displays a message screen on the display unit when the movement of the projected image is stopped or when the movement speed is decelerated.

According to such a configuration, when the movement of the projected image is stopped or the movement speed is slowed down, the user can be notified by displaying a message screen.

[Application Example 5]
In the projector according to the above application example, the message screen is provided with a reception means for receiving a decision as to whether or not the projection image continues to move even if it deviates from the projection surface, and the control unit is provided with the reception means. When the decision to continue the movement is accepted, it is preferable to continue the movement of the projected image in the first direction based on the operation.

According to such a configuration, when the message screen accepts the decision to continue the movement, the movement of the projected image in the first direction is continued, so that the projected image can be removed from the projection surface as necessary. can.

[Application example 6]
In the projector according to the above application example, the control unit is a position adjustment unit so that when the operation reception unit receives a predetermined operation, the end portion of the projection image and the end portion of the projection surface overlap each other. It is preferable to move the projected image to.

According to such a configuration, the projected image can be moved based on a predetermined operation in the operation receiving unit, and the end portion of the projected image and the end portion of the projection surface can be easily overlapped.

[Application 7]
In the projector according to the above application example, the detection unit includes an image pickup unit that captures an image including the projection surface and the projection image and outputs the image, and analyzes the image output by the image pickup unit. , The end of the projection surface and the end of the projection image may be detected.

[Application Example 8]
The projector control method according to this application example includes a light source that emits first light, a modulation unit that generates second light obtained by modulating the first light according to an image signal, and a projection lens. A display unit that displays a projected image on the projection surface by passing the second light through the projection lens, a detection unit that detects the end portion of the projection surface and the end portion of the projection image, and a position for moving the projection lens. A control method for a projector including an adjusting unit and an operation receiving unit that accepts an operation for moving the projected image in the first direction, wherein the projection lens moves based on the operation received by the operation receiving unit. By doing so, the projected image moves in the first direction, and the distance between the ends of the projection surface detected by the detection unit and the end of the projection image falls within the first range. When it enters, it is characterized in that the moving speed at which the projected image moves in the first direction is changed.

According to such a method, when the projector is moving the projection image projected on the projection surface in the first direction based on the operation received by the operation reception unit, the projector is the edge of the projection surface detected by the detection unit. When the distance between the ends of the portion and the end of the projected image falls within the first range, the moving speed of the projected image is changed. Therefore, when it is desired to bring the end portion of the projected image close to the end portion of the projection surface, the movement operation of the projected image can be carefully performed by changing the moving speed of the projected image, so that the convenience of the operation is improved.

[Application 9]
The projector according to this application example has a light source that emits a first light, a modulation unit that generates a second light obtained by modulating the first light according to an image signal, and a projection lens. A display unit that displays a projected image on the projection surface by passing the second light through the projection lens, a detection unit that detects the end of the projection surface and the end of the projection image, and the projection image on the projection surface. The projection image position adjustment unit that adjusts the position of the image, the operation reception unit that accepts the operation of moving the projection image in the first direction, and the projection image position adjustment unit when the operation reception unit accepts the operation. It has a control unit for moving the projected image in the first direction, and the control unit has an end portion of the projection surface when the projected image is moved in the first direction by the operation. When the distance between the ends of the projected image and the end of the projected image falls within the first range, the moving speed at which the projected image moves in the first direction is reduced.

According to such a configuration, when the projector is moving the projection image projected on the projection surface in the first direction based on the operation received by the operation reception unit, the projector is the edge of the projection surface detected by the detection unit. When the distance between the ends of the portion and the end of the projected image falls within the first range, the moving speed of the projected image is reduced. Therefore, when it is desired to bring the end portion of the projected image close to the end portion of the projection surface, the movement speed of the projected image can be reduced so that the movement operation of the projected image can be carefully performed, which improves the convenience of the operation.

[Application Example 10]
In the projector according to the above application example, the projected image position adjusting unit may change the position where the projected image is formed in the modulation unit.

According to such a configuration, the projector adjusts the position of the projected image on the projection surface by changing the position of forming the projected image in the modulation unit, so that the position of the projected image can be adjusted with a simple configuration. It becomes possible to do.

[Application Example 11]
The control method of the projector according to this application example includes a light source that emits a first light, a modulation unit that generates a second light obtained by modulating the first light according to an image signal, and a projection lens. A display unit that displays a projected image on the projection surface by passing the second light through the projection lens, a detection unit that detects an end portion of the projection surface and an end portion of the projection image, and the projection on the projection surface. A control method for a projector including a projected image position adjusting unit for adjusting the position of an image and an operation receiving unit for receiving an operation of moving the projected image in a first direction, wherein the operation receiving unit has received the operation receiving unit. Based on the operation, the projected image position adjusting unit moves the projected image in the first direction, and the end portion between the end portion of the projection surface detected by the detection unit and the end portion of the projected image. When the distance falls within the first range, the projected image is characterized in that the moving speed at which the projected image moves in the first direction is reduced.

According to such a method, when the projector is moving the projection image projected on the projection surface in the first direction based on the operation received by the operation reception unit, the projector is the edge of the projection surface detected by the detection unit. When the distance between the ends of the portion and the end of the projected image falls within the first range, the moving speed of the projected image is reduced. Therefore, when it is desired to bring the end portion of the projected image close to the end portion of the projection surface, the movement speed of the projected image can be reduced so that the movement operation of the projected image can be carefully performed, which improves the convenience of the operation.

The block diagram which shows the schematic structure of the projector which concerns on embodiment. The figure which shows an example of a message screen. A flowchart showing the flow of lens shift processing. The figure which shows the projection image which moves by a lens shift process. The figure which shows the projection image which moves by a lens shift process. The figure which shows the projection image which moves by a lens shift process. The figure which shows the projection image which moves by a lens shift process. The figure which shows the projection image which moves by a lens shift process. The figure which shows an example which projects the wall surface of a building as a screen. It is explanatory drawing for demonstrating the simple size adjustment function, and is the figure which shows the liquid crystal panel. It is explanatory drawing for demonstrating the simple size adjustment function, and is the figure which shows the projection image projected on the screen. It is explanatory drawing for demonstrating the simple size adjustment function, and is the figure which shows the projection image projected on the screen. It is explanatory drawing for demonstrating the simple size adjustment function, and is the figure which shows the liquid crystal panel. It is explanatory drawing for demonstrating the simple size adjustment function, and is the figure which shows the projection image projected on the screen. It is explanatory drawing for demonstrating the simple position adjustment function, and is the figure which shows the liquid crystal panel. It is explanatory drawing for demonstrating the simple position adjustment function, and is the figure which shows the projection image projected on the screen.

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

(First Embodiment)
<Overview of projector>
FIG. 1 is a block diagram showing a schematic configuration of a projector according to the present embodiment. The internal configuration of the projector 1 will be described with reference to FIG.
The projector 1 includes an image projection unit 10, a control unit 40, an operation reception unit 21, a signal reception unit 22, a light source drive unit 23, a focus drive unit 24, a zoom drive unit 25, a lens shift drive unit 26, and an adjustment amount storage unit 27. It includes an image signal input unit 30, an image processing unit 31, an OSD (on-screen display) processing unit 32, a remote control 50, and the like.

The image projection unit 10 includes a light source 11 having a discharge type light source such as an ultrahigh pressure mercury lamp or a metal halide lamp, or a solid light source such as an LED (Light Emitting Diode) or a laser, a liquid crystal light valve 12, a projection lens 13. It includes a light valve driving unit 14 that drives the liquid crystal light valve 12, a focus adjusting mechanism 131, a zoom adjusting mechanism 132, and a lens shift adjusting mechanism 133. In the present embodiment, the image projection unit 10 includes a portion corresponding to a display unit in which the light modulated by the liquid crystal light bulb 12 is magnified by the projection lens 13 and the projected image 150 is displayed on the screen which is the projection surface.
The liquid crystal light bulb 12 functions as a modulation unit, and is composed of a transmissive liquid crystal panel or the like in which a liquid crystal is enclosed between a pair of transparent substrates. In the liquid crystal light valve 12, when a drive voltage corresponding to an image signal is applied to each pixel of the liquid crystal light valve 12 by driving the light valve drive unit 14, each pixel emits light with a light transmission rate corresponding to the image signal. Is modulated by transmitting.

The light emitted from the light source 11 (first light) is modulated by passing through the liquid crystal light valve 12, and the modulated light (second light) is projected by the projection lens 13 to obtain an image. The projected image 150 corresponding to the signal is displayed on the rectangular screen SC.
The modulation unit is not limited to the method using the liquid crystal light valve 12, and other methods such as a DLP (Digital Light Processing) method and an LCOS (Liquid Crystal On Screen) method can be assumed.
The projection lens 13 has a focus lens 13a, and focus adjustment (focus adjustment) is possible by moving the position of the focus lens 13a. Further, the projection lens 13 has a zoom lens 13b, and the projection angle of view can be adjusted by changing the zoom state.
The focus adjustment mechanism 131 is composed of a motor, gears, and the like, and drives (moves) the focus lens 13a based on a drive signal from the focus drive unit 24 to perform focus adjustment.

The zoom adjustment mechanism 132 is composed of a motor, gears, and the like, and drives (moves) the zoom lens 13b based on the control from the zoom drive unit 25 to adjust the zoom.
In the present embodiment, the focus adjustment and the zoom adjustment are assumed to be performed by driving a motor, but the projection lens 13 is provided with a lever for moving the focus lens 13a and the zoom lens 13b, and the user can use the lever. It is also possible to assume a mode in which focus adjustment and zoom adjustment are performed by rotating the lens.
The lens shift adjustment mechanism 133 is composed of a motor, gears, and the like that move the projection lens 13 in two directions orthogonal to the optical axis of the projection lens 13, respectively, and is based on a drive signal from the lens shift drive unit 26. Is moved at a predetermined speed, whereby the projection position of the projected image 150 moves in a desired direction (first direction) up, down, left and right on the screen SC at a moving speed according to the predetermined speed.

The predetermined speed is set, for example, by storing an initial value indicating the rotation speed of the motor per unit time in the adjustment amount storage unit 27 and reading it from the adjustment amount storage unit 27 when the projector 1 is started. Will be done.
Further, the lens shift adjustment mechanism 133 detects the lens shift state of the projection lens 13 as the lens shift amount. Then, the detected lens shift amount is output to the lens shift drive unit 26. In the present embodiment, the lens shift adjusting mechanism 133 and the lens shift driving unit 26 correspond to a position adjusting unit that moves the projection lens 13.

In the present embodiment, as a method of detecting the lens shift amount, the position change amount of the projection lens 13 is detected by an encoder or the like. As another method for detecting the lens shift amount, the motor of the lens shift adjustment mechanism 133 may be used as a stepping motor, and the detection may be performed based on the number of steps of the stepping motor.
The image pickup unit 15 has an image pickup optical system, an image pickup element such as a CCD or CMOS, an interface circuit, or the like, captures the projection direction of the projection lens 13, and outputs captured image data of the captured image. The image pickup optical system of the image pickup unit 15 is arranged so as to face the same direction as the projection lens 13, and has an angle of view for photographing a wider range than the screen SC.

The control unit 40 includes a processor such as a CPU (Central Processing Unit), a RAM used for temporary storage of various data, and a non-volatile memory such as a mask ROM, a flash memory, and a FeRAM (Ferroelectric RAM). Etc. (none of them are shown) and function as a computer. The control unit 40 realizes the functional unit of the control unit 40 by the processor operating according to the control program stored in the non-volatile memory, that is, by the cooperation of the hardware and the software, and the projector 1 Controls the operation of. The control unit 40 may include a plurality of processors.
For example, the control unit 40 has a function of moving the projection lens 13 to the lens shift adjusting mechanism 133 so that the projection image 150 moves in the first direction when the operation of moving the projection lens 13 is accepted. The details of the functional unit of the control unit 40 will be described later.

The operation reception unit 21 includes a plurality of keys and the like for giving various instructions to the projector 1. The keys provided in the operation reception unit 21 include a "power key" for turning the power on / off, an "input switching key" for switching the input image signal, and a menu screen display for making various settings. / "Menu key" to switch between non-display, "Adjustment start key" to start lens shift adjustment, zoom adjustment and focus adjustment, cursor movement on the menu screen, adjustment direction in lens shift adjustment, zoom adjustment and focus adjustment There are "cursor key" to specify the adjustment amount, "decision key" to decide various settings, and so on. When the user operates the operation reception unit 21, the operation reception unit 21 outputs control information according to the user's operation content to the control unit 40.

In the present embodiment, the "cursor key" accepts an operation for moving the projection position of the projection image 150 in the vertical and horizontal directions on the screen SC.
The remote controller 50 emits an operation signal such as infrared rays according to the operation content of the user, and gives various instructions to the main body of the projector 1. The remote controller 50 has a configuration covered with a housing, and has a plurality of keys on the surface thereof.
The keys included in the remote control 50 include a "power key" for turning on / off the power of the projector 1, an "input switching key" for switching the input image signal, and a menu screen for making various settings. "Menu key" to switch between display and non-display, "Adjustment start key" to start lens shift adjustment, zoom adjustment and focus adjustment, cursor movement on the menu screen, adjustment in lens shift adjustment, zoom adjustment and focus adjustment There is a "cursor key" that indicates the direction and adjustment amount, and a "decision key" that determines various settings. The signal receiving unit 22 receives the operation signal emitted by the remote controller 50.

The signal receiving unit 22 is configured to include an infrared receiving module or the like, receives an operation signal emitted from the remote controller 50, and outputs the operation signal as control information to the control unit 40.
The light source driving unit 23 supplies or stops power to the light source 11 based on the instruction of the control unit 40, and switches the light source 11 on and off.
The focus drive unit 24 generates a drive signal of the focus adjustment mechanism 131 based on the instruction of the control unit 40, sends the generated drive signal to the focus adjustment mechanism 131, and moves the focus lens 13a.
The zoom drive unit 25 generates a drive signal of the zoom adjustment mechanism 132 based on the instruction of the control unit 40, sends the generated drive signal to the zoom adjustment mechanism 132, and moves the zoom lens 13b.

The lens shift drive unit 26 generates a drive signal of the lens shift adjustment mechanism 133 based on the instruction of the control unit 40, sends the generated drive signal to the lens shift adjustment mechanism 133, and moves the projection lens 13. In the present embodiment, when the user selects a lens shift from the menu screen displayed by pressing the "menu key" and presses the "cursor key", the lens shift drive unit 26 uses the "cursor key". Moves the projection lens 13 by a predetermined distance at a reference speed in the direction in which is pressed. As a result, the projected image 150 projected on the screen SC moves by a predetermined amount. Further, the lens shift drive unit 26 changes the speed at which the projection lens 13 moves based on the speed change instruction from the control unit 40. The lens shift drive unit 26 may acquire the lens shift amount moved from the lens shift adjustment mechanism 133 and feed back the lens shift amount to the control unit 40.

The adjustment amount storage unit 27 is composed of a non-volatile memory, and stores information regarding a movable amount in which the projection lens 13 can be moved by the lens shift adjustment mechanism 133 and a reference position as a reference for displaying information regarding the movement of the projection lens 13. Remember. Further, the information regarding the reference speed when the projection lens 13 is moved by the lens shift adjustment mechanism 133 is stored. The information regarding the reference position and the information regarding the reference speed stored in the adjustment amount storage unit 27 are read out by the control unit 40.
The shooting control unit 28 causes the imaging unit 15 to perform shooting and output captured image data based on the instruction of the control unit 40. In the present embodiment, when the imaging control unit 28 instructs the imaging unit 15 to shoot, the imaging unit 15 photographs a region including the screen SC and the projected image 150 projected on the screen SC, and the captured image data obtained by the imaging. Is output to the control unit 40. The control unit 40 instructs the imaging control unit 28 to capture images at predetermined time intervals while the projected image 150 is moving due to the execution of the lens shift process.

The image signal input unit 30 has various image input terminals for connecting to an external image supply device (not shown) such as a personal computer, a video playback device, a memory card, a USB storage, and a digital camera via a cable. Is provided, and an image signal is input from the image supply device. The image signal input unit 30 converts the input image signal into image data in a format that can be processed by the image processing unit 31 and outputs it to the image processing unit 31.
Based on the instructions of the control unit 40, the image processing unit 31 adjusts the brightness, contrast, sharpness, hue, etc. of the image data input from the image signal input unit 30, and adjusts various image quality such as gamma correction. To give. The image processing unit 31 outputs the image data after such adjustment and processing to the OSD processing unit 32.

The OSD processing unit 32 performs a process of superimposing an OSD image such as a menu screen or a message screen on the image data input from the image processing unit 31 based on the instruction of the control unit 40. The OSD processing unit 32 includes an OSD memory (not shown), and stores OSD image data representing figures, fonts, and the like for forming an OSD image.

When the control unit 40 instructs the superposition of the OSD image, the OSD processing unit 32 reads the necessary OSD image data from the OSD memory, and the image processing unit 31 so that the OSD image is superposed at a predetermined position of the input image. This OSD image data is combined with the image data input from. The image data in which the OSD image data is combined is output to the write valve drive unit 14.
If there is no instruction from the control unit 40 to superimpose the OSD image, the OSD processing unit 32 outputs the image data output from the image processing unit 31 to the light bulb drive unit 14 as it is.

When the light valve driving unit 14 drives the liquid crystal light valve 12 according to the image data input from the OSD processing unit 32, the liquid crystal light valve 12 modulates the light incident from the light source 11 into image light according to the image data. , This image light is projected from the projection lens 13.
<Details of the functional part in the control part>
Next, the details of the functional unit included in the control unit 40 will be described. In the present embodiment, the control unit 40 includes an end extraction unit 42, an approach determination unit 44, a movement speed change unit 46, and a message generation unit 48. When the control unit 40 is moving the projected image 150 in the first direction based on a user operation such as pressing the "cursor key", the control unit 40 is between the end of the screen SC and the end of the projected image 150. When the distance between the ends of the image 150 falls within the first range, the projected image 150 has a function of changing the moving speed of the moving image 150 in the first direction.

The end extraction unit 42 analyzes the two-dimensional captured image data captured by the imaging unit 15, and extracts the end of the screen SC and the end of the projected image 150 projected on the screen SC. As a method for extracting edges from a two-dimensional image, a well-known edge detection method (for example, a search-based method or a zero intersection method) can be adopted. The end extraction unit 42 extracts the ends of the rectangular screen SC in four directions (up / down / left / right directions) and the ends of the projected image 150 in four directions (up / down / left / right directions), and the positions of the extracted ends. The information is output to the approach determination unit 44. In the present embodiment, the image pickup unit 15, the shooting control unit 28, and the end portion extraction unit 42 detect the end portion of the screen SC and the end portion of the projected image 150 by analyzing the image captured by the image pickup unit 15. Corresponds to the detection unit.

The approach determination unit 44 calculates the distance between the ends defined by the end of the screen SC and the end of the projected image 150 in each direction based on the position of each end output by the end extraction unit 42. do. Further, the approach determination unit 44 determines whether or not the calculated distance between the ends is included in the first range, and based on the determination result, the end portion of the projected image 150 approaches the end portion of the screen SC. It is determined whether or not it has been done. The distance between the ends and the first range may be shown in pixel units (pixels) constituting the captured image captured by the image pickup unit 15, and are actually converted from the characteristics of the image pickup optical system and the image pickup element of the image pickup unit 15. May be indicated by a distance (eg, m). For example, the first range may be set from 0 pixels (a state in which the end of the projected image 150 and the end of the screen SC overlap) to 100 pixels.

When the proximity determination unit 44 determines that the projected image 150 has moved due to the lens shift and the end of the projected image 150 has approached the end of the screen SC, the end of the projected image 150 and the end of the screen SC The approach information indicating the approach is output to the moving speed changing unit 46.
When the approach speed changing unit 46 receives the approach information output from the approach determination unit 44, the movement speed changing unit 46 changes the moving speed at which the projected image 150 moves due to the lens shift. In the present embodiment, when the moving speed of the projected image 150 is changed, the moving speed changing unit 46 instructs the lens shift driving unit 26 to change the speed in order to slow down the moving speed of the projection lens 13 from the current speed. do. In this case, the moving speed changing unit 46 may select and instruct one of a plurality of predetermined speeds, or set a predetermined proportional constant to the current moving speed and change the speed. May be decided.

Further, in the present embodiment, when the end portion of the screen SC and the end portion of the projected image 150 are close to each other within the first range, the moving speed changing unit 46 decelerates the moving speed of the projected image 150 due to the lens shift. Further, when the end of the screen SC and the end of the projected image 150 overlap, the movement is stopped, that is, the deceleration is instructed so that the movement speed becomes “0”.
By the way, the moving speed set when the end of the screen SC and the end of the projected image 150 are close to each other within the first range is such that the end of the screen SC and the end of the projected image 150 overlap. It may be constant up to, and the moving speed may be gradually reduced as the distance between the ends becomes shorter.
When the moving speed of the projected image 150 is changed, the moving speed changing unit 46 outputs change information indicating the change of the speed to the message generation unit 48.

When a predetermined operation such that the "cursor key" is continuously pressed for a predetermined time is executed, the moving speed changing unit 46 moves the projected image 150 in the pressed direction, and the projected image is projected. The movement of the projected image 150 may be stopped at a position where the end of the 150 overlaps with the end of the screen SC. This allows the projected image 150 to be quickly moved to the desired end of the screen SC.
When the message generation unit 48 receives the change information from the movement speed change unit 46, the message generation unit 48 generates a message screen including a message corresponding to the change information, sends the generated message screen to the OSD processing unit 32, and sends the message screen to the OSD image. Is projected onto the screen SC. Further, the message generation unit 48 may output response information according to the user's response to the message screen to the movement speed changing unit 46.
FIG. 2 shows a warning screen 148 as an example of a message screen. Such a warning screen 148 is generated when the change information indicates a deceleration of the movement speed or when the movement is stopped due to the overlap of the two ends.

The warning screen 148 has a button as a reception means for accepting whether or not to continue the movement of the projected image 150, and when the user selects "continue to move" indicating a continuation decision, the message generation unit 48 , Information indicating that the movement continuation of the projected image 150 has been selected is output to the movement speed changing unit 46. The moving speed changing unit 46 moves the projected image 150 at the speed before the stop in response to the pressing of the "cursor key". As a result, a part of the projected image 150 is projected off the screen SC.
On the other hand, when the user selects "end movement" for this warning screen 148, the projected image 150 does not move even if the "cursor key" in the direction away from the screen SC is pressed. The "cursor keys" in the other three directions except the "cursor key" are valid, and the projected image 150 can move in the designated direction in response to the pressing of the "cursor key".

FIG. 3 is a flowchart showing the flow (control method) of the lens shift process. In this embodiment, this process is executed each time the "cursor key" is pressed. 4A to 4E are diagrams showing the movement of the projected image 150 projected on the screen SC when the lens shift process is executed, and these diagrams will also be described as appropriate.
As shown in FIG. 4A, when the projected image 150 is projected on the screen SC, when the user selects a lens shift from the menu screen displayed by pressing the "menu key" and presses the "cursor key". The lens shift process is started. When the lens shift process is started, the control unit 40 first determines the moving direction of the projection lens 13 from the pressed "cursor key" (step S200). In this case, the direction in which the projected image 150 moves (first direction) is to the right.

Next, the control unit 40 starts moving the projection lens 13 at a reference speed in the determined moving direction (step S202). As a result, the projected image 150 starts moving on the screen SC.
Next, the control unit 40 extracts the end portion of the projected image 150 and the end portion of the screen SC from the image captured by the imaging unit 15, and the distance between the ends of the two ends (the end portion of the projected image 150). The distance between the screen SC and the edge of the screen SC) is calculated (step S204).
Next, the control unit 40 determines whether or not the two ends overlap each other from the calculated distance between the ends (step S206).

Here, when it is determined from the calculated distance between the ends that the two ends do not overlap (No in step S206), the control unit 40 determines whether or not the calculated distance between the ends is within the first range. Is determined (step S216).
Here, as shown in FIG. 4B, when it is determined that the distance between the ends is out of the first range (No in step S216), the projection lens 13 moves by a predetermined distance and ends the process.
On the other hand, as shown in FIG. 4C, when it is determined that the distance between the ends is included in the first range (Yes in step S216), the control unit 40 moves the projected image 150 in the first direction. Is changed, and the projection lens 13 is moved by a predetermined distance to end the process.

Specifically, the moving speed changing unit 46 instructs the lens shift driving unit 26 to change the speed so that the speed at which the projection lens 13 moves is slowed down from the current speed. In this case, the moving speed changing unit 46 may select and instruct one of a plurality of predetermined speeds, or set a predetermined proportional constant to the current moving speed and change the speed. May be decided. More specifically, it may be set so that the amount of movement of the projected image 150 is reduced by pressing the "cursor key" once.

Further, in step S206, as shown in FIG. 4D, when it is determined that the two ends overlap (Yes in step S206), the control unit 40 stops the movement of the projection lens 13 (step S208). As a result, the projected image 150 moving on the screen SC is stopped.
Next, the control unit 40 superimposes and projects the warning screen 148 from which the projected image 150 is off the screen as an OSD image on the projected image 150 (step S210).
Next, the control unit 40 determines whether or not the projected image 150 may be removed from the screen SC based on the user's response to the warning screen 148 (step S212).

Here, when it is determined that it is not good for the projected image 150 to deviate from the screen SC (No in step S212), the process ends. As a result, even if the user presses the "cursor key" to instruct the projected image 150 to move in the first direction, the projected image 150 does not move in the first direction.
On the other hand, when it is determined that the projected image 150 may be removed from the screen SC (Yes in step S212), the control unit 40 resumes the movement of the projection lens 13 in the first direction (step S214), and the projection lens 13 moves by a predetermined distance and ends the process. As a result, as shown in FIG. 4E, a part of the projected image 150 is separated from the screen SC.

According to the above-described embodiment, the following effects are obtained.
(1) The projector 1 is a screen SC extracted by the end extraction unit 42 when the projected image 150 projected on the screen SC is moved in the first direction based on the operation received by the operation reception unit 21. When the distance between the end portion and the end portion of the projected image 150 falls within the first range, the moving speed of the projected image 150 is changed. Therefore, when it is desired to bring the end of the projected image 150 close to the end of the screen SC, the moving speed of the projected image 150 can be changed to carefully move the projected image 150, which makes the lens shift operation convenient. improves.
(2) In the projector 1, when the end of the moving projection image 150 and the end of the screen SC overlap, the movement of the projection image 150 stops, so that the projection image 150 comes off the screen SC. It is possible to prevent the projected image 150 from being displayed without being displayed.

(3) When the projector 1 wants to bring the end of the projected image 150 closer to the end of the screen SC, the moving speed of the projected image 150 is decelerated when the distance between the ends falls within the first range. The user can accurately move the projected image 150.
(4) When the movement of the projected image 150 is stopped or the moving speed is slowed down, the projector 1 can notify the user by projecting the warning screen 148.

(5) The projector 1 has a button for accepting a decision as to whether or not to continue the movement even if the projected image 150 deviates from the screen SC, and when the user decides to continue the movement, the first projection image 150. Since the movement in the direction of is continued, at least a part of the projected image 150 can be removed from the screen SC as needed.
(6) The projector 1 can move the projected image 150 based on a predetermined operation in the operation receiving unit 21, and can easily superimpose the end portion of the projected image 150 and the end portion of the screen SC.

(Second Embodiment)
Hereinafter, the projector according to the second embodiment will be described.
The projector 1 of the present embodiment has the same configuration as that of the first embodiment (see FIG. 1), but has a zoom adjustment mechanism 132 and a lens shift adjustment mechanism 133, and a zoom drive unit 25 and a lens for driving them. It does not have a shift drive unit 26. Instead, the projector 1 of the present embodiment is configured to be able to execute a simple size adjustment function and a simple position adjustment function.

Similar to the zoom adjustment mechanism 132, the simple size adjustment function adjusts the size of the projected image 150 on the screen SC (hereinafter, also referred to as “screen size”), and the zoom adjustment mechanism 132 optically adjusts the screen size. The simple size adjustment function electronically adjusts the screen size, whereas the simple size adjustment function adjusts the screen size electronically. Further, the simple position adjustment function adjusts the projection position of the projected image 150 on the screen SC like the lens shift adjustment mechanism 133, but the lens shift adjustment mechanism 133 optically adjusts the projection position. On the other hand, the simple position adjustment function electronically adjusts the projection position.
The projector 1 is provided with a zoom adjustment mechanism 132, a lens shift adjustment mechanism 133, a zoom drive unit 25, and a lens shift drive unit 26, and is further configured to be capable of executing a simple size adjustment function and a simple position adjustment function. You may be.

6A, 6B, 6C, 7A and 7B are explanatory views for explaining the simple size adjustment function. Of these, FIGS. 6A and 7A are views showing a liquid crystal panel 12p included in the liquid crystal light bulb 12, and FIGS. 6B, 6C and 7B are views showing a projected image 150 projected on the screen SC.

As shown in FIGS. 6A and 7A, the liquid crystal panel 12p is formed with a rectangular pixel region 12a in which a plurality of pixels (not shown) are arranged in a matrix. Since each pixel of the pixel area 12a is set to a light transmission rate according to the image signal by driving the light valve drive unit 14, when the light transmitted through the pixel area 12a is projected onto the screen SC, the image signal is displayed. The corresponding projected image 150 is displayed on the screen SC. From this point onward, setting the light transmittance of each pixel in the pixel region 12a in order to display the projected image 150 is also referred to as "forming the projected image 150 in the pixel region 12a". Further, the orientation of the image on the liquid crystal panel 12p and the orientation of the image on the screen SC do not always match, but for the sake of simplicity of explanation, these orientations are shown to match in the drawings.

In order to display the projected image 150 in a large size and with high definition, it is desirable to form the projected image 150 using the entire area of the pixel region 12a of the liquid crystal panel 12p as shown in FIGS. 6A and 6B. However, as shown in FIG. 6C, when the projected image 150 is projected larger than the screen SC due to the limitation of the distance between the projector 1 and the screen SC, the limitation of the size of the screen SC, etc., the simple size adjustment function It is possible to reduce the screen size by.

As shown in FIGS. 7A and 7B, the simple size adjustment function sets a rectangular image forming region 12e smaller than the pixel region 12a in the pixel region 12a, and forms a projected image 150 in the image forming region 12e. This is a function to adjust the screen size. For example, the projector 1 can adjust the screen size in a plurality of stages in the range of 0.5 times to 1.0 times. The control unit 40 holds a size adjustment value indicating the stage of the screen size, and when this size adjustment value is output to the image processing unit 31, the image processing unit 31 determines the screen size according to the input size adjustment value. Perform the process of changing.

A "tele key" and a "wide key" are arranged in the operation reception unit 21 and the remote controller 50 of the present embodiment, and the user can change the screen size by operating these keys. When the "telekey" is operated by the user, the control unit 40 changes the size adjustment value so that the screen size is one step smaller than the current size, and outputs the image to the image processing unit 31. Further, when the "wide key" is operated by the user, the control unit 40 changes the size adjustment value so that the screen size is one step larger than the current size, and outputs the image to the image processing unit 31. The control unit 40 does not change the size adjustment value when the "telekey" is operated when the screen size is the minimum and when the "wide key" is operated when the screen size is the maximum. , Maintain the screen size at that time.

The image processing unit 31 sets an image forming region 12e having a size corresponding to the size adjustment value input from the control unit 40 in the pixel region 12a, and the image processing unit 31 sets the image data input from the image signal input unit 30 to the image data. A process for forming an image in the set image forming region 12e is performed. Specifically, the image processing unit 31 thins out the image data input from the image signal input unit 30 thereafter in order to form an image in the set image forming area 12e when the screen size is other than the maximum. Shrink the image. Further, the image processing unit 31 sets the region (invalid region 12n) outside the image forming region 12e to black, that is, a color that minimizes the light transmittance. As a result, as shown in FIG. 7B, the projected image 150 based on the image signal can be displayed in a size that fits within the range of the screen SC. At this time, the region 150B outside the projected image 150, that is, the region 150B corresponding to the invalid region 12n is set to black, so that it is difficult for the user to see.

8A and 8B are explanatory views for explaining the simple position adjustment function, FIG. 8A is a diagram showing a liquid crystal panel 12p, and FIG. 8B is a diagram showing a projected image 150 projected on the screen SC. ..
As shown in FIGS. 8A and 8B, the simple position adjustment function changes the position of the image forming area 12e in the pixel area 12a when the screen size is set to a value other than the maximum by the simple size adjustment function. This is a function for adjusting the position of the projected image 150 on the screen SC. The control unit 40 holds coordinate information representing the coordinates of a predetermined position (for example, the center) of the image forming region 12e, and when the control unit 40 outputs this coordinate information to the image processing unit 31, the image processing unit 31 Performs a process of changing the position of the image forming region 12e according to the input coordinate information.

In the present embodiment, when the user selects a predetermined item from the menu screen displayed by pressing the "menu key", the control unit 40 projects a position adjustment screen (not shown) as an OSD image. Then, the user can adjust the position of the projected image 150 by pressing the "cursor key" while the position adjustment screen is displayed. As shown in FIG. 8A, when the "cursor key" is pressed by the user, the control unit 40 moves the image forming region 12e by a predetermined movement amount in the direction corresponding to the direction in which the "cursor key" is pressed. The coordinate information is updated so as to be output to the image processing unit 31. Then, the image processing unit 31 moves the position of the image forming region 12e based on the coordinate information from the control unit 40. That is, the image processing unit 31 sets the image forming area 12e at a position in the pixel area 12a based on the updated coordinate information, and sets the image forming area for the image data input from the image signal input unit 30. A process for forming an image is performed in 12e. As a result, as shown in FIG. 8B, the projected image 150 projected on the screen SC also moves in the direction corresponding to the direction in which the "cursor key" is pressed. 8A and 8B show the state after the user operates the "cursor key" in the right direction in the state shown in FIGS. 7A and 7B. The user can continuously move the projected image 150 by continuously pressing the "cursor key".

As shown in FIG. 1, also in this embodiment, the control unit 40 includes an end extraction unit 42, an approach determination unit 44, a movement speed change unit 46, and a message generation unit 48 as functional units. When the control unit 40 moves the projected image 150 in the first direction by the simple position adjustment function, the distance between the ends of the screen SC and the end of the projected image 150 is in the first range. Upon entering, the projected image 150 has a function of decelerating the moving speed of moving in the first direction.

Similar to the first embodiment, the end extraction unit 42 analyzes the two-dimensional captured image data captured by the imaging unit 15, and the end of the screen SC and the end of the projected image 150 projected on the screen SC. Is extracted, and the position information of each extracted end portion is output to the approach determination unit 44.

Similar to the first embodiment, the approach determination unit 44 is an end portion defined by an end portion of the screen SC and an end portion of the projected image 150 based on the position of each end portion output by the end extraction unit 42. Calculate the distance in each direction. Further, the approach determination unit 44 determines whether or not the calculated distance between the ends is included in the first range, and based on the determination result, the end portion of the projected image 150 approaches the end portion of the screen SC. It is determined whether or not it has been done.
When the proximity determination unit 44 determines that the projection image 150 has moved by the simple position adjustment function and the end portion of the projection image 150 has approached the end portion of the screen SC, the end portion of the projection image 150 and the end portion of the screen SC The approach information indicating the approach to and is output to the moving speed changing unit 46.

When the movement speed changing unit 46 receives the approach information output from the approach determination unit 44, the movement speed changing unit 46 slows down the moving speed of the projected image 150 by the simple position adjustment function. Specifically, when the movement speed changing unit 46 updates the coordinate information in response to the pressing of the "cursor key", the moving speed changing unit 46 approaches the moving amount of the image forming region 12e (projected image 150) per pressing. Make it smaller than the amount of movement before accepting information. That is, when the "cursor key" is continuously pressed, the movement amount per unit time becomes small, so that the movement speed of the projected image 150 slows down.

Similar to the first embodiment, the moving speed changing unit 46 reduces the moving speed of the projected image 150 when the end of the screen SC and the end of the projected image 150 approach each other within the first range, and further. When the end of the screen SC and the end of the projected image 150 overlap, the movement is stopped. Further, the amount of movement set when the end of the screen SC and the end of the projected image 150 are close to each other within the first range is such that the end of the screen SC and the end of the projected image 150 overlap. It may be constant up to, and the amount of movement may be gradually reduced as the distance between the ends becomes shorter.

When the moving speed of the projected image 150 is changed, the moving speed changing unit 46 outputs change information indicating the change of the speed to the message generation unit 48.
When the message generation unit 48 receives the change information from the movement speed change unit 46, the message generation unit 48 generates a message screen including a message corresponding to the change information and sends it to the OSD processing unit 32, and the message screen is used as an OSD image in the image projection unit 10. Is projected onto the screen SC. For example, as in the first embodiment, when it is determined that the end of the screen SC and the end of the projected image 150 overlap, the message generation unit 48 warns that the projected image 150 is detached from the screen SC. 148 is generated and projected.

The operation flow of the projector 1 of the present embodiment is the same as that of the first embodiment except that the movement of the projected image 150 on the screen SC is a movement due to a lens shift or a movement due to a simple position adjustment function. Therefore, the description is omitted. That is, also in this embodiment, the control unit 40 operates according to the flowchart shown in FIG.

According to the above-described embodiment, the simple position adjustment function has the same effect as that of the first embodiment. That is, when the projector 1 is moving the projected image 150 projected on the screen SC in the first direction based on the operation received by the operation reception unit 21, the end of the screen SC extracted by the end extraction unit 42. When the distance between the end portion of the portion and the end portion of the projected image 150 falls within the first range, the moving speed of the projected image 150 is decelerated. Therefore, when it is desired to bring the end of the projected image 150 close to the end of the screen SC, the moving speed of the projected image 150 can be reduced so that the moving operation of the projected image 150 can be carefully performed, which is convenient for the simple position adjustment function. Sex improves.

Also in this embodiment, the image pickup unit 15, the shooting control unit 28, and the end extraction unit 42 correspond to the detection unit that detects the end portion of the screen SC and the end portion of the projected image 150. Further, in the first embodiment, the lens shift adjusting mechanism 133 and the lens shift driving unit 26 correspond to the projected image position adjusting unit that adjusts the position of the projected image 150 on the screen SC, whereas in the present embodiment, the lens shift adjusting mechanism 133 and the lens shift driving unit 26 correspond to the projected image position adjusting unit. The image processing unit 31 that changes the position of the image forming region 12e, that is, the position of the projected image 150 according to the coordinate information input from the control unit 40 corresponds to the projected image position adjusting unit.

Although the present invention has been described above based on the illustrated embodiment, the present invention is not limited to the present embodiment, and variations as described below can be assumed.
(1) The screen SC is not limited to a rectangular shape. As shown in FIG. 5, a mode in which the wall surface of the building is projected as a screen SC can also be assumed. In this case, when the projected image 150 moves to the right of the screen SC by the lens shift operation or the simple position adjustment function and one vertex P of the projected image 150 comes into contact with one side L constituting the screen SC, the control unit 40 warns. The screen 148 is projected and the movement of the projected image 150 is stopped.
(2) The end portion of the screen SC is extracted based on the two-dimensional captured image data captured by the imaging unit 15, but the method is not limited to this method. For example, the edge of the screen SC may be extracted by a distance measuring sensor using laser light. As a result, even when it is difficult to detect the edge of the edge of the screen SC by image analysis, such as an outdoor building wall, it can be detected with high accuracy.

Further, the specific mounting form of each functional unit of the control unit 40 shown in FIG. 1 is not particularly limited. Therefore, it is not always necessary to implement hardware corresponding to each functional unit individually, and it is of course possible to have a configuration in which the functions of a plurality of functional units are realized by executing a program by one processor. Further, a part of the functions realized by the software in the above embodiment may be realized by the hardware, or a part of the functions realized by the hardware may be realized by the software.

1 ... Projector, 10 ... Image projection unit, 11 ... Light source, 12 ... Liquid crystal light valve, 13 ... Projection lens, 13a ... Focus lens, 13b ... Zoom lens, 14 ... Light valve drive unit, 15 ... Imaging unit, 21 ... Operation Reception unit, 22 ... signal reception unit, 23 ... light source drive unit, 24 ... focus drive unit, 25 ... zoom drive unit, 26 ... lens shift drive unit, 27 ... adjustment amount storage unit, 28 ... shooting control unit, 30 ... image Signal input unit, 31 ... Image processing unit, 32 ... OSD processing unit, 40 ... Control unit, 42 ... End extraction unit, 44 ... Approach determination unit, 46 ... Movement speed change unit, 48 ... Message generation unit, 50 ... Remote control , 131 ... Focus adjustment mechanism, 132 ... Zoom adjustment mechanism, 133 ... Lens shift adjustment mechanism, 148 ... Warning screen, 150 ... Projected image.

Claims (8)

A light source that emits the first light,
A modulation unit that generates a second light obtained by modulating the first light according to an image signal, and a modulation unit.
A display unit having a projection lens and allowing the second light to pass through the projection lens to display a projection image on the projection surface.
A detection unit that detects the end of the projection surface and the end of the projection image,
The position adjustment unit that moves the projection lens and
An operation reception unit that accepts an operation of moving the projected image in the first direction,
When the operation receiving unit receives the operation, it has a control unit for moving the projection lens so that the projected image moves in the first direction by controlling the position adjusting unit. death,
When the control unit moves the projected image in the first direction, the distance between the ends of the projection surface and the end of the projected image falls within the first range. Then, the moving speed at which the projected image moves in the first direction is reduced .
Is the first range the position where the end of the projection surface and the end of the projection image overlap?
A projector characterized by a range up to a position separated by a predetermined length . In the projector according to claim 1,
When the control unit is moving the projection image in the first direction, if the end portion of the projection image and the end portion of the projection surface overlap, the movement of the projection image is stopped. A projector characterized by letting you do it. In the projector according to claim 1 or 2.
The control unit is a projector characterized in that a message screen is displayed on the display unit when the moving speed is decelerated. In the projector according to claim 3,
The message screen includes a reception means for accepting a decision as to whether or not to continue moving even if the projected image deviates from the projection surface.
When the control unit receives a decision to continue moving, the projector is characterized in that it continues to move the projected image in the first direction based on the operation. In the projector according to any one of claims 1 to 4 .
The detection unit is a projector characterized by detecting an end portion of the projection surface and an end portion of the projection image by analyzing the projection surface and an image including the projection image. It has a light source that emits a first light, a modulation unit that generates a second light obtained by modulating the first light according to an image signal, and a projection lens, and the second light is applied to the projection lens. It is a control method of a projector including a display unit that allows light to pass through and displays a projected image on a projection surface.
Accepting the operation of moving the projected image in the first direction and
To detect the end of the projection surface and the end of the projection image,
Moving the projection lens based on the operation
When the distance between the ends of the projection surface and the end of the projection image falls within the first range while the projection image is being moved in the first direction, the said Including decelerating the moving speed at which the projected image moves in the first direction.
Is the first range the position where the end of the projection surface and the end of the projection image overlap?
A method for controlling a projector, which comprises a range up to a position separated by a predetermined length . A light source that emits the first light,
A modulation unit that generates a second light obtained by modulating the first light according to an image signal, and a modulation unit.
A display unit having a projection lens and allowing the second light to pass through the projection lens to display a projection image on the projection surface.
A detection unit that detects the end of the projection surface and the end of the projection image,
A projected image position adjusting unit that adjusts the position of the projected image on the projection surface,
An operation reception unit that accepts an operation of moving the projected image in the first direction,
It has a control unit for moving the projected image in the first direction by controlling the projected image position adjusting unit when the operation receiving unit receives the operation.
When the control unit moves the projected image in the first direction, the distance between the ends of the projection surface and the end of the projected image falls within the first range. Then, the moving speed at which the projected image moves in the first direction is reduced .
Is the first range the position where the end of the projection surface and the end of the projection image overlap?
A projector characterized by a range up to a position separated by a predetermined length . In the projector according to claim 7 ,
The projected image position adjusting unit is a projector characterized in that the position where the projected image is formed in the modulation unit is changed.

Images