JP2013005251A - Projector and projector control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector which when a user who does not know trapezoidal distortion correction operation wrongly tries to perform trapezoidal distortion correction operation, allows confirmation before execution.SOLUTION: A projector 1 is provided with image projection means 10, trapezoidal distortion correction means 15, and input operation means 23. If the trapezoidal distortion correction means 15 does not perform the trapezoidal distortion correction for a prescribed time, when the trapezoidal distortion correction operation is next accepted by the input operation means 23, the image projection means 10 projects a confirmation screen to confirm whether to perform trapezoidal distortion correction.

Description

  The present invention relates to a projector and a projector control method.

  In a projector that projects an image on a projection surface such as a screen, when the image is projected with the projector tilted with respect to the projection surface, the phenomenon that the image displayed on the projection surface is distorted in a trapezoidal shape (trapezoidal distortion) Arise. For this reason, there has been proposed a projector that detects the inclination (installation angle) of the projector and automatically corrects the trapezoidal distortion caused by the inclination. Patent Document 1 discloses a projector that performs trapezoidal distortion correction according to the installation angle when the installation angle changes. According to such a projector, even a user unfamiliar with the operation of the projector can easily obtain an image in which the trapezoidal distortion correction has been performed.

JP 2003-283963 A

  In the case of a projector such as Patent Document 1, in order to prevent flickering of the screen due to fluctuations in the detection result of the angle detection unit, after the trapezoidal distortion correction is finally performed, if the angle change does not occur more than a certain value, No trapezoidal distortion correction is performed. For this reason, when fine adjustment of trapezoidal distortion correction is necessary, a method of performing adjustment by manual operation such as a cursor key is used. However, for users who are unfamiliar with the operation, fine adjustment of trapezoidal distortion correction by manual operation (hereinafter referred to as manual trapezoidal distortion correction) has been a complicated and complicated operation. In addition, if the manual keystone correction operation key is accidentally pressed, there is a problem that a subsequent countermeasure cannot be understood.

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

  Application Example 1 A projector according to this application example is a projector including an image projection unit that modulates light emitted from a light source in accordance with image information and projects the light onto a projection surface, and is projected onto the projection surface. A keystone distortion correcting means for correcting the trapezoidal distortion of the projected image, an input operation means having a correction operation key for correcting the keystone distortion, and a control means for controlling the operation of the projector, When the trapezoidal distortion correction by the trapezoidal distortion correcting unit has not been performed for a predetermined time, the control unit determines whether to perform the trapezoidal distortion correction when a trapezoidal distortion correcting operation is next received by the input operation unit. The confirmation screen is projected by the image projecting means.

  According to this application example, when trapezoidal distortion correction has not been performed for a predetermined time, and a trapezoidal distortion correction operation is received next, a confirmation screen as to whether or not to perform trapezoidal distortion correction is projected. Accordingly, even a user who is unfamiliar with the trapezoidal distortion correction operation can easily determine whether the trapezoidal distortion correction operation is necessary, and can prevent the trapezoidal distortion correction from being erroneously performed.

  Application Example 2 In the projector according to the application example described above, the trapezoidal distortion correction is executed when an operation for executing the trapezoidal distortion correction is detected on the confirmation screen as to whether to perform the trapezoidal distortion correction. It is characterized by that.

  According to this application example, when the trapezoidal distortion correction operation is not performed for a predetermined time and a trapezoidal distortion correction operation is detected, the user is allowed to select whether or not to execute the trapezoidal distortion correction. Accordingly, even a user who is unfamiliar with the trapezoidal distortion correction operation or a user who understands the trapezoidal distortion correction can easily select whether or not the trapezoidal distortion correction is necessary. Accordingly, even a user who is unfamiliar with the trapezoidal distortion correction operation can easily determine whether the trapezoidal distortion correction operation is necessary, and can prevent the trapezoidal distortion correction from being erroneously performed.

  Application Example 3 A projector control method according to this application example includes an image projection unit that modulates light emitted from a light source according to image information and projects the light onto a projection surface, and a projection image projected onto the projection surface. An input operation means having a correction operation key for correcting the keystone distortion of the projector, comprising: a detection step for detecting a trapezoid distortion correction operation by the correction operation key; and a detection step that detects the keystone distortion If the trapezoidal distortion correction step and the trapezoidal distortion correction by the trapezoidal distortion correction step are not performed for a predetermined time, the trapezoidal distortion correction operation is accepted next. And a trapezoidal distortion correction confirmation step for projecting a confirmation screen as to whether or not to perform the trapezoidal distortion correction by the image projection means.

  According to this application example, when trapezoidal distortion correction has not been performed for a predetermined time, and a trapezoidal distortion correction operation is received next, a confirmation screen as to whether or not to perform trapezoidal distortion correction is projected. Accordingly, even a user who is unfamiliar with the trapezoidal distortion correction operation can easily determine whether the trapezoidal distortion correction operation is necessary, and can prevent the trapezoidal distortion correction from being erroneously performed.

The block diagram which shows the circuit structure of a projector. The front view which shows a liquid crystal light valve. Explanatory drawing which shows the principle of the installation angle detection of a projector. It is explanatory drawing for demonstrating trapezoid distortion, and is a figure which shows the state which has not performed the trapezoid distortion correction | amendment with respect to image data, (a) is the front view which looked at the liquid crystal light valve from the light-incidence surface side, (B) is a side view showing how the projector projects horizontally, (c) is a front view showing a projected image displayed on the screen, and (d) shows how the projector is projected with the projector tilted. The side view to show, (e) is a front view which shows the projection image displayed on a screen. It is explanatory drawing for demonstrating trapezoid distortion correction, (a) is the front view which looked at the liquid-crystal light valve from the light-incidence surface side, (b) is the projection image displayed on a screen in the case of performing slant projection FIG. A confirmation screen projected to confirm whether or not to perform keystone correction. It is a flowchart showing the operation of the projector, (a) is the operation when the power is turned on, (b) is the operation when the timer has passed a predetermined time, (c) is the angle detection means detects the angle change more than the predetermined value (D) is a flowchart showing an operation when the input operation means accepts a trapezoidal distortion correction operation.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The following embodiments do not limit the invention according to the scope of claims, and all combinations of features in the embodiments are not necessarily essential to the solution means of the invention.

(First embodiment)
FIG. 1 is a block diagram illustrating a circuit configuration of the projector 1 according to the present embodiment.
As shown in FIG. 1, the projector 1 includes an image projection unit 10, a control unit 20, a storage unit 21, a light source control unit 25, an input operation unit 23, an image signal input unit 18, an image signal processing unit 17, and an OSD processing unit 16. The keystone distortion correcting means 15, the angle detecting means 19, the power supply terminal 30, the power supply unit 31 and the like are housed in a housing (not shown).

  The image projection means 10 includes a light source 11, three liquid crystal light valves 12R, 12G, and 12B as light modulation devices, a projection lens 13 as a projection optical system, a liquid crystal drive means 14, and the like. The image projection unit 10 modulates the light emitted from the light source 11 with the liquid crystal light valves 12R, 12G, and 12B and projects the light from the projection lens 13 to display an image on the screen SC or the like.

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

  FIG. 2 is a front view showing the liquid crystal light valves 12R, 12G, and 12B. The liquid crystal light valves 12, 12G, and 12B are configured by a liquid crystal panel or the like in which liquid crystal is sealed between a pair of transparent substrates. As shown in FIG. 2, the transparent substrates of the liquid crystal light valves 12R, 12G, and 12B are transparent so that a driving voltage can be applied to the liquid crystal for each minute region (pixel 12p) in a rectangular region (pixel region 12a). Electrodes (pixel electrodes) are formed in a matrix.

When the liquid crystal driving unit 14 applies a driving voltage corresponding to the input image information to each pixel 12p, each pixel 12p is set to a light transmittance corresponding to the image information. For this reason, the light emitted from the light source 11 is modulated by transmitting through the liquid crystal light valves 12R, 12G, and 12B, and image light corresponding to image information is formed for each color light.
The formed image light of each color is synthesized for each pixel 12p by a color synthesis optical system (not shown) to become color image light, and then enlarged and projected onto the screen SC or the like by the projection lens 13.

  In the present embodiment, the projector 1 that projects using the light source lamp 11a as the light source is exemplified, but the present invention is also applicable to a projector that projects using an LED (Light Emitting Diode) light source or a laser light source as the light source. Can do.

  In the present embodiment, the image projection unit 10 exemplifies a transmissive liquid crystal type projection optical system using the light source 11 and the three liquid crystal light valves 12R, 12G, and 12B as light modulators. You may employ | adopt the light modulation apparatus of other display systems, such as a display system and a micromirror device system (light switch display system).

  Returning to FIG. 1, the control means 20 includes a CPU (Central Processing Unit) (not shown), a RAM (Random Access Memory) used for temporary storage of various data, and the like, and a control program stored in the storage means 21 ( The overall operation of the projector 1 is controlled by operating according to (not shown). That is, the control unit 20 functions as a computer together with the storage unit 21. In addition, the control means 20 includes a timer 20a that measures time.

  The storage means 21 is composed of a rewritable nonvolatile memory such as a flash memory or FeRAM (Ferroelectric RAM). The storage unit 21 stores a control program for controlling the operation of the projector 1, various setting data for defining operation conditions of the projector 1, and the like. In the present embodiment, the storage unit 21 stores a trapezoidal distortion correction confirmation flag 21a. When a trapezoidal distortion correction operation is accepted in the state where the trapezoidal distortion correction confirmation flag 21a is set, a confirmation screen as to whether or not to execute the trapezoidal distortion correction is projected.

  The input operation means 23 includes a plurality of operation keys for the user to give various instructions to the projector 1. The operation keys provided in the input operation means 23 include a power key for alternately switching on / off the power, an input switching key for switching a plurality of image input terminals input to the image signal input means 18, and various settings. Menu key that overlays the setting menu for performing settings, cursor keys for the user to select setting items from the menu, enter key for determining various settings, escape key for returning the screen being set, and correcting keystone distortion For example, a keystone correction key is used as a correction operation key.

  When the user operates various operation keys of the input operation unit 23, the input operation unit 23 outputs an operation signal corresponding to the operation content of the user to the control unit 20. The input operation means 23 may have a configuration including a remote controller (remote control) signal receiving means (not shown) and a remote controller (not shown) capable of remote operation. In this case, the remote controller emits an operation signal such as an infrared ray corresponding to the operation content of the user, and the remote control signal receiving means receives this and transmits it to the control means 20 as control information.

  The angle detection unit 19 includes an acceleration sensor 19 a and the like, and detects the installation angle of the projector 1 based on an instruction from the control unit 20. Then, the detected installation angle is notified to the control means 20.

  Here, a method for detecting the installation angle of the projector 1 will be described. FIG. 3 is an explanatory diagram illustrating the principle of installation angle detection of the projector 1. This figure is a diagram showing the projector 1, its installation surface H, and the screen SC from the right side surface in the projection direction. The installation surface H is assumed to be horizontal. In the present embodiment, the acceleration sensor 19a is used to detect the installation angle of the projector 1. The acceleration sensor 19a is mounted inside the projector 1, and detects acceleration acting in the left direction (the rear of the projector 1) in the drawing on the one-dot chain line in FIG.

As shown in FIG. 3, when the projector 1 is installed at an installation angle θ, the acceleration component on the alternate long and short dash line is g · sin θ, as shown. The acceleration sensor 19a outputs a voltage corresponding to the acceleration component. Thereby, the angle detection means 19 can detect the installation angle of the projector 1 based on the voltage value output from the acceleration sensor 19a.
In the present embodiment, the acceleration sensor 19a is used. However, the mechanism is not limited to the acceleration sensor 19a as long as the installation angle of the projector 1 can be detected.

  Returning to FIG. 1, the light source control unit 25 controls the supply and stop of power to the light source 11 based on an instruction from the control unit 20, and switches between turning on and off the light source 11.

  As described above, the image signal input means 18 includes a plurality of image input terminals. From each image input terminal, an image signal (image information) is connected via a cable (not shown) from an external device such as a video playback device or a personal computer. Also called).

  The image signal processing unit 17 converts the image information input from the image signal input unit 18 into image information representing the gradation of each pixel of the liquid crystal light valves 12R, 12G, and 12B. Here, the converted image information is for each color light of R, G, and B, and is composed of a plurality of pixel values corresponding to all the pixels of the liquid crystal light valves 12R, 12G, and 12B. The pixel value defines the light transmittance of the corresponding pixel, and the intensity (gradation) of light transmitted through each pixel and emitted is defined by this pixel value.

  The OSD processing unit 16 performs processing for superimposing and displaying an OSD (on-screen display) image such as a menu image or a message image on the projection image based on an instruction from the control unit 20. The OSD processing unit 16 includes an OSD memory (not shown), and stores OSD image information representing graphics, fonts, and the like for forming an OSD image.

When the control unit 20 instructs to superimpose the OSD image, the OSD processing unit 16 reads necessary OSD image information from the OSD memory, and outputs an image signal so that the OSD image is superimposed at a predetermined position on the projected image. The OSD image information is synthesized with the image information input from the processing means 17. The image information combined with the OSD image information is output to the trapezoidal distortion correction means 15.
If there is no instruction to superimpose the OSD image from the control unit 20, the OSD processing unit 16 outputs the image information input from the image signal processing unit 17 to the trapezoidal distortion correction unit 15 as it is.

  The trapezoidal distortion correction means 15 is input to suppress distortion (trapezoidal distortion) that causes the projected image to expand in the tilt direction when an image is projected with the projector 1 tilted with respect to the screen SC. Correction of image data as image information (keystone distortion correction) is performed. Based on the trapezoidal distortion correction instruction information input from the input operation unit 23 and the information on the installation angle of the projector 1 detected by the angle detection unit 19, the control unit 20 corrects the trapezoidal distortion correction to the trapezoidal distortion correction unit 15. The trapezoidal distortion correction means 15 performs trapezoidal distortion correction.

  The trapezoidal distortion correction is a process in which pixel values are thinned out from image data, and the projected image is reduced in the tilt direction. The trapezoidal distortion correction unit 15 outputs the corrected image data to the liquid crystal driving unit 14. To do. Note that when the keystone distortion correction is not performed, the image data output from the OSD processing unit 16 is output to the liquid crystal driving unit 14 as it is. When the liquid crystal driving unit 14 drives the liquid crystal light valves 12R, 12G, and 12B according to the input image data, that is, the pixel value for each pixel 12p, an image corresponding to the image data is projected onto the screen SC.

Next, trapezoidal distortion correction by the trapezoidal distortion correcting unit 15 will be described with reference to FIGS. 4 and 5.
FIG. 4 is an explanatory diagram for explaining trapezoidal distortion, and shows a state in which keystone distortion correction is not performed on image data. 4A is a front view of the liquid crystal light valves 12R, 12G, and 12B as viewed from the light incident surface side, and FIG. 4B is a side view showing how the projector 1 projects horizontally. FIG. 4C is a front view showing a projected image displayed on the screen SC at that time. FIG. 4D is a side view showing a state of projection with the projector 1 tilted, and FIG. 4E is a front view showing a projected image displayed on the screen SC at that time. .

  In FIG. 4, the left and right directions (horizontal left and right) toward the liquid crystal light valves 12R, 12G, and 12B are ± x directions, the up and down directions (vertical up and down) are ± y directions, and left and right toward the screen SC. The direction (left and right in the horizontal direction) is the ± X direction, and the vertical direction (up and down in the vertical direction) is the ± Y direction. Here, the X direction and the Y direction of the screen SC correspond to the x direction and the y direction of the liquid crystal light valve 12, respectively. For example, the pixels on the upper right (+ x, + y side) of the pixel region 12a are transmitted. The light is projected on the upper right (+ X, + Y side) of the screen SC.

  4 and 5, the lattice pattern shown in the pixel area 12a and the projected image Ga corresponds to the image formed in the pixel area 12a and the projected image Ga projected on the screen SC. These lines are supplementarily added for the purpose of illustration, and do not mean that such a pattern is actually displayed.

  As shown in FIG. 4A, when trapezoidal distortion correction is not performed, the liquid crystal light valves 12R, 12G, and 12B are images based on image data input from the trapezoidal distortion correcting unit 15 (input image Gi). Are formed in the entire pixel region 12a. That is, in this case, the area for forming the input image Gi (image forming area 12i) coincides with the pixel area 12a. Here, as shown in FIGS. 4B and 4C, when the projector 1 is installed horizontally and performs projection with no inclination on the screen SC, the projected image Ga ( The input image Gi) has the same rectangular shape as the pixel region 12a.

  On the other hand, as shown in FIGS. 4D and 4E, when the projector 1 is installed to be inclined with respect to the screen SC and projected upward (in the + Y direction), it is displayed on the screen SC. The projected image Ga is enlarged in the ± X direction and the + Y direction and distorted into a trapezoidal shape as it goes in the tilt direction (+ Y direction). In the present embodiment, trapezoidal distortion correction in the case where tilt projection in the + Y direction (vertical direction) is performed will be described.

  FIG. 5 is an explanatory diagram for explaining trapezoidal distortion correction. FIG. 5A is a front view of the liquid crystal light valves 12R, 12G, and 12B as viewed from the light incident surface side, and FIG. It is a front view which shows the projection image displayed on screen SC when performing an inclination projection.

  The trapezoidal distortion correction unit 15 performs pixel value decimation from the image data input from the OSD processing unit 16 and reduces the projection image Ga as it goes in the tilt direction (+ Y direction), compared to the case where correction is not performed. Make appropriate corrections.

Specifically, as shown in FIG. 5 (a), the pixel regions 12a of the liquid crystal light valves 12R, 12G, and 12B have a trapezoidal shape opposite to the projection image Ga that is not corrected, that is, the tilt direction (+ y direction). An image forming area 12i having a shape in which the lateral width is reduced toward the head is set. Further, the input image Gi is formed in the image forming area 12i by thinning out more pixel values from the image data at a position where the degree of enlargement by tilt projection is higher.
The trapezoidal distortion correcting unit 15 corrects the image data so that the light transmittance of each pixel 12p included in the region (non-image forming region) 12n outside the image forming region 12i is minimized.

As a result, as shown in FIG. 5B, the distortion of the input image Gi due to the tilt projection is corrected, and the region Gn in the projection image Ga corresponding to the non-image forming region 12n is hardly irradiated with light. Therefore, the input image Gi is displayed on the screen SC in a shape without distortion (rectangular shape).
In order to compensate for the lack of gradation information associated with thinning out pixel values, it is desirable to correct the pixel values of the pixels adjacent to the thinning target pixel according to the thinned pixel values.

  Returning to FIG. 1, power such as AC 100 V is supplied to the power supply unit 31 from the outside via the power supply terminal 30. The power supply unit 31 converts input power (AC power) into predetermined DC power and supplies the power to each unit of the projector 1. In addition, the power supply unit 31 stops supplying power (operating power) necessary for image projection to each unit (power-on state) and operating power supply based on an instruction from the control unit 20. It is possible to switch between a state (standby state) of waiting for an operation for turning on.

Next, the operation of the projector 1 according to the present embodiment will be described with reference to the flowchart of FIG.
[Operation when the power is turned on]
FIG. 7A is a flowchart showing an operation when the projector 1 detects a power-on operation.
As shown in FIG. 7A, when the projector 1 detects a power-on operation by a power key operation of the input operation means 23 (step S101), the control means 20 causes the light source control means 25 to turn on the light source 11. (Step S102), the process proceeds to Step S103.

  In step S103, the control unit 20 performs trapezoidal distortion correction (automatic trapezoidal distortion correction) based on the installation angle detected by the angle detection unit 19, and the process proceeds to step S104.

  In step S104, the control means 20 clears the trapezoidal distortion correction confirmation flag 21a, and proceeds to step S105.

  In step S105, the control means 20 resets the timer 20a and starts measuring time, and proceeds to step S106.

  In step S106, the projector 1 starts image projection and ends this flow.

[Operation when the timer passes the specified time]
FIG. 7B is a flowchart showing the operation when the time measured by the timer 20a passes a predetermined time while the projector 1 is operating.
As shown in FIG. 7B, when a time T1 (for example, 30 seconds) in which the time measured by the timer 20a is a predetermined time elapses while the projector 1 is operating (step S201), the control unit 20 measures the time measured by the timer 20a. After stopping, the trapezoidal distortion correction confirmation flag 21a is set (step S202). This flow is complete | finished above (step S203).

[Operation when the angle detection means detects an angle change of a predetermined value or more]
FIG. 7C is a flowchart showing an operation when the angle detection unit 19 detects an angle change of a predetermined value or more while the projector 1 is operating.
As shown in FIG. 7C, when the angle detection unit 19 detects an angle change greater than or equal to a predetermined value while the projector 1 is operating (step S301), the control unit 20 detects the installation angle detected by the angle detection unit 19. Is executed (step S302), and the process proceeds to step S303.

  In step S303, the control means 20 clears the trapezoidal distortion correction confirmation flag 21a, and proceeds to step S304.

  In step S304, the control means 20 resets the timer 20a and starts measuring time, and transitions to step S305.

  In step S305, this flow ends.

[Operation when input operation means accepts trapezoidal distortion correction operation]
FIG. 7D is a flowchart showing an operation when the input operation unit 23 accepts a trapezoidal distortion correction operation while the projector 1 is operating.
As shown in FIG. 7D, when the keystone distortion correction operation by the keystone distortion correction key (correction operation key) of the input operation means 23 is detected while the projector 1 is operating (step S401: detection step), the process proceeds to step S402. Transition.

In step S402, the control means 20 checks whether or not the trapezoidal distortion correction confirmation flag 21a is set (step S402). When the trapezoidal distortion correction confirmation flag 21a is set (step S402: Y), the process proceeds to step S403.
When the trapezoidal distortion correction confirmation flag 21a is not set (cleared) (step S402: N), the process proceeds to step S406.

  In step S403, the control means 20 projects a confirmation screen M1 on whether or not to execute (perform) trapezoidal distortion correction by the image projection means 10 (trapezoidal distortion correction confirmation step), and proceeds to step S404. A confirmation screen M1 at this time is shown in FIG.

  In step S404, the control means 20 checks the response to the confirmation screen M1 in step S403. When a confirmation operation for performing trapezoidal distortion correction is received (step S404: Y), the process proceeds to step S405. When an operation that does not execute trapezoidal distortion correction is received (step S404: N), the process proceeds to step S408.

  In step S405, the control means 20 clears the trapezoidal distortion correction confirmation flag 21a, and proceeds to step S406.

  In step S406, the control means 20 executes trapezoidal distortion correction based on the trapezoidal distortion correction operation detected in step S401 (trapezoidal distortion correction step), and the process proceeds to step S407.

  In step S407, the control means 20 resets the timer 20a and starts measuring time, and transitions to step S408.

  In step S408, this flow ends.

As described above, according to the projector 1 of the present embodiment, when the keystone distortion correction is not performed for a predetermined time (time T1), the keystone distortion correction is performed when the keystone distortion correction operation by the input operation unit 23 is received next. A confirmation screen M1 as to whether or not to perform is projected. Accordingly, even a user who is unfamiliar with the trapezoidal distortion correction operation can easily determine whether the trapezoidal distortion correction operation is necessary, and can prevent the trapezoidal distortion correction from being erroneously performed.
When trapezoidal distortion correction is not performed for a predetermined time and a trapezoidal distortion correction operation is detected, the user is allowed to select whether or not to execute the trapezoidal distortion correction. This makes it possible to easily select whether or not to require the trapezoidal distortion correction regardless of whether the user is unfamiliar with the trapezoidal distortion correction operation or the user who understands the trapezoidal distortion correction.

Moreover, you may change the said embodiment as follows.
(Modification 1)
In the above-described embodiment, the projector 1 is installed to be tilted in the vertical direction (+ Y direction) to perform the trapezoidal distortion correction, but is tilted in other directions (−Y direction, ± X direction (horizontal direction)). It may be installed to perform trapezoidal distortion correction. In the case of tilting in the -Y direction, the trapezoidal distortion correction can be executed by detecting the installation angle using the acceleration sensor 19a, as in the above embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 10 ... Image projection means, 11 ... Light source, 12R, 12G, 12B ... Liquid crystal light valve, 13 ... Projection lens, 14 ... Liquid crystal drive means, 15 ... Trapezoid distortion correction means, 16 ... OSD processing means, 17 ... Image signal processing means, 18 ... Image signal input means, 19 ... Angle detection means, 19a ... Acceleration sensor, 20 ... Control means, 20a ... Timer, 21 ... Storage means, 21a ... Trapezoid distortion correction confirmation flag, 23 ... Input operation means , 25 ... light source control means, 30 ... power supply terminal, 31 ... power supply section.

Claims (3)

A projector comprising image projection means for modulating light emitted from a light source according to image information and projecting it on a projection surface,
Trapezoidal distortion correction means for correcting trapezoidal distortion of the projected image projected on the projection plane;
Input operation means having a correction operation key for correcting the trapezoidal distortion;
Control means for controlling the operation of the projector;
With
Whether or not the control means performs the trapezoidal distortion correction when the trapezoidal distortion correction by the trapezoidal distortion correction means is not performed for a predetermined time and the input operation means then accepts the trapezoidal distortion correction operation. A projection screen is projected by the image projecting means. The projector according to claim 1,
A projector that executes the trapezoidal distortion correction when an operation for executing the trapezoidal distortion correction is detected on a confirmation screen as to whether to perform the trapezoidal distortion correction. Image projection means for modulating the light emitted from the light source according to the image information and projecting it on the projection surface;
Input operation means having a correction operation key for correcting trapezoidal distortion of a projected image projected on the projection surface;
A projector control method comprising:
A detection step of detecting a trapezoidal distortion correction operation by the correction operation key;
Based on the trapezoidal distortion correction operation detected by the detection step, the trapezoidal distortion correction is performed,
If the trapezoidal distortion correction in the trapezoidal distortion correction step has not been performed for a predetermined time, and the next time the trapezoidal distortion correction operation is received, a confirmation screen as to whether or not to perform the trapezoidal distortion correction is projected by the image projection unit. A trapezoidal distortion correction confirmation step,
A projector control method comprising the steps of:

Images