JP2008242107A - Projector, dimming control method, dimming control program, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector which is suitably adjustable in light quantity by a dimming device even when predetermined image information is put together with input image information. <P>SOLUTION: The projector 1 includes a controller 4. The controller 4 includes an image adjustment unit 45, an image region detection unit 47, a luminance calculation unit 48, and a dimming control unit 49. The image adjustment unit 45 combines the predetermined image data with the input image data to generate composite image data. The image region detection unit 47 detects an image data region corresponding to image data obtained by excluding the predetermined image data from the composite image data. The luminance calculation unit 48 calculates average luminance of the image data region detected by the image region detection unit 47. The dimming control unit 49 adjusts the quantity of light incident on a liquid crystal panel 23 by outputting a control signal to the dimming unit 22 based upon the average luminance calculated by the luminance calculation unit 48. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a projector, a dimming control method, a dimming control program, and a recording medium.

Conventionally, a light source device, a light modulation device that modulates light emitted from the light source device according to image information to form an optical image, a projection optical device that enlarges and projects the formed optical image, and a light modulation device A projector including a light control device that adjusts the amount of incident light is known (for example, Patent Document 1).
In the projector described in Patent Document 1, a light shielding plate constituting the light control device is rotatably disposed between the light source device and the light modulation device, and the light shielding plate is rotated and emitted from the light source device. The amount of light emitted from the light source device is adjusted by blocking the light. Further, the adjustment of the amount of light by the light shielding plate is performed based on the luminance of the video signal (image information) input to the light modulation device.

By the way, in recent years, image information having various aspect ratios such as 4: 3 used in television broadcasting and 16: 9 used in high-vision broadcasting is input to the projector. Accordingly, projectors including light modulation devices having various aspect ratios such as 4: 3 and 16: 9 are known.
When the aspect ratio of the image related to the image information input to the projector is different from the aspect ratio of the light modulation device, the projector combines the image information indicating black with the input image information, It matches the aspect ratio of the modulator.
Furthermore, when viewing TV broadcasts or playing back video software encoded with an encoding system such as MPEG2 (Moving Picture Experts Group 2), the projector is composed of character information called so-called closed captions. In some cases, the image information to be input is combined with the input image information.

International publication WO2003 / 032080

  However, in the projector described in Patent Document 1, the amount of light is adjusted based on the luminance of the image information input to the light modulation device. When image information composed of information is combined, the luminance of the entire image information changes, and thus there is a problem that the light amount cannot be adjusted appropriately by the light control device.

  An object of the present invention is to provide a projector, a dimming control method, and a dimming device capable of appropriately adjusting the amount of light with a dimming device even when predetermined image information is synthesized with input image information. A control program and a recording medium are provided.

  The projector of the present invention includes a light source device, a light modulation device that modulates light emitted from the light source device according to image information to form an optical image, a projection optical device that projects the formed optical image in an enlarged manner, A projector comprising: a light control device that adjusts the amount of light incident on the light modulation device; and a control device that controls these devices, wherein the control device receives input image information input to the projector. An image combining unit that combines predetermined image information to generate combined image information, an image region detection unit that detects an image information region corresponding to image information obtained by removing the predetermined image information from the combined image information, A luminance acquisition unit that acquires the luminance of the image information region detected by the image region detection unit, and a dimming control that causes the dimmer to adjust the light amount based on the luminance acquired by the luminance acquisition unit Characterized in that it comprises and.

  According to such a configuration, when the predetermined image information is combined by the image combining unit, the image region detection unit removes the predetermined image information from the combined image information generated by the image combining unit. And the luminance acquisition unit acquires the luminance of the image information region detected by the image region detection unit. And the light control part can adjust a light quantity to a light control apparatus based on the brightness | luminance acquired by the brightness | luminance acquisition part. Therefore, even when image information indicating black color or predetermined image information such as character information is synthesized with the input image information, the light amount can be appropriately adjusted by the light control device.

  In the present invention, the control device includes an aspect ratio determination unit that determines whether an aspect ratio of an image related to the input image information matches an aspect ratio of the light modulation device, and the image composition unit includes When the aspect ratio determining unit determines that the aspect ratio of the image related to the input image information does not match the aspect ratio of the light modulation device, the aspect ratio of the image related to the composite image information is the aspect ratio of the light modulation device. The image information indicating black is combined with the input image information so that the image information area matches the input image information, and the image area detecting unit detects an image information area obtained by removing the image information indicating black from the combined image information. preferable.

According to such a configuration, since the control device includes the aspect ratio determination unit and the image synthesis unit, the aspect ratio of the light modulation device and the aspect ratio of the image related to the synthesized image information can be matched. . For example, when the aspect ratio of the image related to the input image information is 4: 3 and the aspect ratio of the light modulation device is 16: 9, the image composition unit displays black at both ends in the horizontal direction of the input image information. By combining the image information shown, the aspect ratio of the light modulation device and the aspect ratio of the image related to the combined image information can be matched.
Here, when the image information indicating black is combined with the input image information, the luminance of the entire combined image information is greatly reduced. On the other hand, since the image area detection unit detects the image information area obtained by removing the image information indicating black from the composite image information, the light amount can be adjusted appropriately by the light control device.

  A dimming control method for a projector according to the present invention includes a light source device, a light modulation device that modulates light emitted from the light source device in accordance with image information to form an optical image, and an enlarged projection of the formed optical image. A projector dimming control method comprising: a projection optical device; a dimming device that adjusts the amount of light incident on the light modulation device; and a control device that controls these devices. An image composition step for synthesizing predetermined image information with the input image information to generate composite image information, and an image for detecting an image information area corresponding to the image information obtained by removing the predetermined image information from the composite image information Based on the area detection step, the brightness acquisition step of acquiring the brightness of the image information area detected by the image area detection step, and the brightness acquired by the brightness acquisition step, And executes a dimming control step of adjusting the amount of light to the serial dimmer.

  According to such a configuration, the projector executes the image synthesis step, the image region detection step, the luminance acquisition step, and the dimming control step, and thus can exhibit the same operations and effects as the projector described above. it can.

  A dimming control program for a projector according to the present invention projects a light source device, a light modulation device that modulates light emitted from the light source device according to image information to form an optical image, and an enlarged optical image formed A projector dimming control program comprising a projection optical device, a dimming device that adjusts the amount of light incident on the light modulation device, and a control device that controls these devices, the control device comprising: An image composition step for generating composite image information by combining predetermined image information with input image information input to the projector, and image information corresponding to image information obtained by removing the predetermined image information from the composite image information An image region detecting step for detecting a region, a luminance acquiring step for acquiring the luminance of the image information region detected by the image region detecting step, and the luminance acquiring step. Based on the obtained luminance, characterized in that to execute and the dimming control step of adjusting the amount in the light control device.

  According to such a configuration, the same operations and effects as those of the projector light control method described above can be achieved.

  The recording medium of the present invention is characterized in that the above-described dimming control program is recorded on a computer so as to be readable.

  According to such a configuration, the same operations and effects as the projector dimming control program described above can be achieved. As recording media, magnetic tapes such as DAT (Digital Audio Tape), magnetic disks such as flexible disks, optical disks such as CD (Compact Disc) and DVD (Digital Versatile Disc), magneto-optical disks, hard disk devices, and semiconductors A memory or the like can be used, and a dimming control program can be installed, executed, and distributed using these.

[First Embodiment]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
[Configuration of projector]
FIG. 1 is a block diagram illustrating a schematic configuration of the projector 1.
The projector 1 modulates light emitted from a light source according to image data (image information) to form an optical image, and enlarges and projects the formed optical image on a screen Sc, as shown in FIG. The image projection device 2, the operation device 3, and the control device 4 are roughly configured.

As shown in FIG. 1, the image projection apparatus 2 includes a light source device 21, a light control device 22, a liquid crystal panel 23 as a light modulation device, and a projection optical device 24.
The light source device 21 includes a light source lamp 25 configured by a high-pressure discharge lamp, and the light source lamp 25 emits light toward the liquid crystal panel 23. The light source device 21 may include various self-light emitting elements such as a light emitting diode, a laser diode, and an organic EL element instead of the light source lamp 25.
The light control device 22 adjusts the amount of light emitted from the light source lamp 25, and includes a light shielding plate (not shown) that is rotatably disposed between the light source device 21 and the liquid crystal panel 23. Is done. The light shielding plate rotates based on a control signal from the control device 4 to block light emitted from the light source device 21, thereby adjusting the amount of light incident on the liquid crystal panel 23.

The liquid crystal panel 23 is a transmissive liquid crystal panel, and changes the arrangement of liquid crystal molecules sealed in a liquid crystal cell (not shown) to transmit or block the light emitted from the light source lamp 25 into image data. In response to this, an optical image is formed, and this optical image is emitted to the projection optical device 24. In the present embodiment, the aspect ratio of the liquid crystal panel 23 is 16: 9.
The projection optical device 24 is configured as a combined lens in which a plurality of lenses are housed in a cylindrical lens barrel (not shown), and magnifies and projects an optical image emitted from the liquid crystal panel 23 toward the screen Sc. is there. A projected image based on the emitted optical image is displayed on the screen Sc.

  Although not shown, the projector 1 includes three liquid crystal panels 23 corresponding to the three colors RGB. In addition, the light source device 21 includes a color light separation optical device that separates light emitted from the light source lamp 25 into light of three colors. Further, the projection optical device 24 includes a combining optical device that generates an optical image representing a color image by combining three color optical images.

  The operating device 3 is for starting and adjusting the projector 1 and is composed of an operation panel (not shown) provided on the exterior housing, a remote controller (not shown), and the like. The user of the projector 1 can set whether or not to execute a dimming control process described later by operating the operation device 3.

The control device 4 includes, for example, a CPU (Central Processing Unit) and the like, and controls the entire projector 1, and includes a main memory 41 and image processing means 42 as shown in FIG. These components 41 and 42 are connected by a bus (not shown) so that necessary information can be transmitted.
The main memory 41 stores programs, data, and the like for executing predetermined processing by the control device 4, and stores the dimming control program of the present invention.

  The image processing unit 42 includes, for example, a DSP (Digital Signal Processor), a GPU (Graphics Processor Unit), and the like, and mainly performs image processing. The image processing unit 42 includes an image generation unit 43, an aspect ratio determination unit 44, and the like. , An image adjustment unit 45, a video memory 46, an image region detection unit 47, a luminance calculation unit 48, and a dimming control unit 49.

The image generation unit 43 samples the input image data signal to generate image data in units of frames (hereinafter referred to as input image data (input image information)).
Note that the image data signal may be externally input from a PC (Personal Computer) or the like via a connection terminal (not shown) of the projector 1, and further, a projector incorporating a DVD (Digital Versatile Disk) playback device or the like. In that case, it may be input via an internal bus.
The aspect ratio determination unit 44 determines whether or not the aspect ratio of the image related to the input image data matches the aspect ratio of the liquid crystal panel 23.

The image adjustment unit 45 serving as an image composition unit is configured to change the light emitted from the light source lamp 25 by the liquid crystal panel 23 from the input image data generated by the image generation unit 43 based on the determination result by the aspect ratio determination unit 44. Image data for modulation is generated, and the generated image data is stored in the video memory 46.
Specifically, when the aspect ratio determination unit 44 determines that the aspect ratio of the image related to the input image data matches the aspect ratio of the liquid crystal panel 23, the image adjustment unit 45 stores the input image data in the video memory 46. Remember.

  On the other hand, when the aspect ratio determining unit 44 determines that the aspect ratio of the image related to the input image data does not match the aspect ratio of the liquid crystal panel 23, the image adjusting unit 45 converts the image data indicating black into the input image data. The synthesized image data (synthesized image information) is generated so that the aspect ratio of the image related to the input image data matches the aspect ratio of the liquid crystal panel 23, and the synthesized image data is stored in the video memory 46.

FIG. 2 is a diagram illustrating an example of a projected image based on the combined image data combined by the image adjustment unit 45.
Here, as a case where the image adjustment unit 45 synthesizes image data indicating black color with input image data, for example, there are the following cases.
For example, it is assumed that the aspect ratio of the input image data is 4: 3, and the vertical resolution is the same between the input image data and the liquid crystal panel 23. In this case, as shown in FIG. 2, the image adjustment unit 45 inserts the black images PL and PR into the left and right portions of the projection image P1 displayed on the screen Sc, that is, both ends in the horizontal direction. Then, image data indicating black is synthesized with the input image data.

When the image adjustment unit 45 generates composite image data by combining the image data indicating black color with the input image data, the image adjustment unit 45 provides the image area detection unit 47 with composite information indicating that the composite image data has been generated. Output. Note that the combination information includes information indicating at what position and what size image data is combined with the input image data.
Then, the image adjustment unit 45 outputs the input image data or composite image data stored in the video memory 46 to the liquid crystal panel 23, and the liquid crystal panel 23 converts the input image data or composite image data stored in the video memory 46 into the input image data or composite image data. An optical image is formed and enlarged and projected onto the screen Sc.

  The image region detection unit 47 detects an image data region (image information region) corresponding to the image data obtained by removing the image data indicating black from the composite image data based on the composite information output from the image adjustment unit 45. Note that the image data area corresponding to the image data obtained by removing the image data indicating black from the composite image data is the image PC of a portion excluding the black images PL and PR in the projection image P1 in FIG. Here, when the composite information is not output by the image adjustment unit 45, that is, when the input image data is stored in the video memory 46 without generating the composite image data, the image area detection unit 47 An image data area of the entire input image data stored in the video memory 46 is detected. That is, the image area detection unit 47 switches the image data area to be detected according to whether or not the composite image data is generated by the image adjustment unit 45.

A luminance calculation unit 48 as a luminance acquisition unit calculates the average luminance of the image data region detected by the image region detection unit 47.
The dimming control unit 49 outputs a control signal to the dimming device 22 based on the average luminance calculated by the luminance calculating unit 48 and adjusts the amount of light incident on the liquid crystal panel 23. For example, the dimming control unit 49 can adjust the light amount of light incident on the liquid crystal panel 23 to decrease as the average luminance calculated by the luminance calculation unit 48 increases.

[Dimmer control process of projector]
Next, dimming control processing of the projector 1 will be described with reference to FIG.
FIG. 3 is a flowchart showing the dimming control processing of the projector 1.
When an image data signal is input to the projector 1, input image data is generated by the image generation unit 43. Then, the projector 1 performs the dimming control process by executing the following steps S1 to S5 according to the dimming control program stored in the main memory 41.

When the input image data is generated by the image generation unit 43, the aspect ratio determination unit 44 determines whether or not the aspect ratio of the image related to the input image data matches the aspect ratio of the liquid crystal panel 23 (aspect ratio determination). Step S1).
Next, the image adjustment unit 45 modulates the light emitted from the light source lamp 25 by the liquid crystal panel 23 from the input image data generated by the image generation unit 43 based on the determination result by the aspect ratio determination unit 44. Image data is generated and the generated image data is stored in the video memory 46 (image data generation step S2).
Specifically, when the aspect ratio determination unit 44 determines that the aspect ratio of the image related to the input image data matches the aspect ratio of the liquid crystal panel 23, the image adjustment unit 45 stores the input image data in the video memory 46. Store (input image data storage step S21).

On the other hand, when the aspect ratio determination unit 44 determines that the aspect ratio of the image related to the input image data does not match the aspect ratio of the liquid crystal panel 23, the image adjustment unit 45 determines that the aspect ratio of the image related to the input image data is Image data indicating black is combined with the input image data so as to match the aspect ratio of the liquid crystal panel 23 (black image data combining step S22).
When predetermined image data is synthesized with the input image data and the synthesized image data is generated, the image adjustment unit 45 stores the synthesized image data in the video memory 46 (synthesized image data storage step S23).
In the present embodiment, the image composition step includes step S22 and step S23.

When the input image data or the composite image data is stored in the video memory 46, the image area detection unit 47 removes the image data indicating black from the composite image data based on the composite information output from the image adjustment unit 45. An image data area corresponding to the image data is detected (image area detection step S3).
Next, the luminance calculation unit 48 calculates the average luminance of the image data region detected by the image region detection unit 47 (luminance acquisition step S4).
When the average luminance is calculated by the luminance calculation unit 48, the dimming control unit 49 outputs a control signal to the dimming device 22 based on the average luminance calculated by the luminance calculation unit 48 and enters the liquid crystal panel 23. The amount of light to be adjusted is adjusted (light control step S5).
The dimming control process is performed by executing steps S1 to S5 as described above.

The projector 1 according to the present embodiment has the following effects.
(1) When predetermined image information is synthesized by the image adjustment unit 45, the image area detection unit 47 corresponds to image data obtained by removing predetermined image data from the synthesized image data generated by the image adjustment unit 45. The image data region to be detected is detected, and the luminance calculation unit 48 calculates the average luminance of the image data region detected by the image region detection unit 47. Then, the dimming control unit 49 can cause the dimming device 22 to adjust the light amount based on the average luminance calculated by the luminance calculating unit 48. Therefore, even when predetermined image information is combined with the input image data, the light control device 22 can appropriately adjust the amount of light.
(2) When image data indicating black is combined with input image data, the luminance of the entire combined image data is greatly reduced. On the other hand, the image area detection unit 47 detects the image data area corresponding to the image data obtained by removing the image data indicating black from the composite image data, so that the light control device 22 appropriately adjusts the light amount. Can do.

[Second Embodiment]
A projector 1A according to a second embodiment of the invention will be described.
In the following description, parts that have already been described are assigned the same reference numerals and description thereof is omitted.
The projector 1 according to the first embodiment includes an operation device 3 and a control device 4 having an image processing unit 42, and the image processing unit 42 includes an aspect ratio determination unit 44 and an image adjustment unit 45. It was. In contrast, the projector 1A according to the present embodiment includes the operation device 3A and the control device 4A having the image processing unit 42A. The image processing unit 42A includes a character display determination unit 50, an image adjustment unit 45A, and the like. It differs in that it has.

[Configuration of projector]
FIG. 4 is a block diagram showing a schematic configuration of the projector 1A.
As shown in FIG. 4, the projector 1A is roughly configured by an image projection device 2, an operation device 3A, and a control device 4A.
The operation device 3A is used to start and adjust the projector 1A. The user of the projector 1 operates the operation device 3A so as to display character information to be described later in the projection image. Further, the position of the character information in the projected image can be changed.

The control device 4A includes a CPU and the like, and controls the projector 1A as a whole. The control device 4A includes a main memory 41 and an image processing unit 42A.
The image processing unit 42A includes, for example, a DSP and a GPU, and mainly performs image processing. The image processing unit 42A includes an image generation unit 43A, a character display determination unit 50, an image adjustment unit 45A, and a video memory 46. An image area detecting unit 47, a luminance calculating unit 48, and a dimming control unit 49.
The image generation unit 43A samples input image data signals to generate input image data in units of frames. In addition, character data (character information) is superimposed on the image data signal, and the image generation unit 43A generates input image data, acquires the character data superimposed on the image data signal, and stores the acquired character data. The image is output to the image adjustment unit 45A.

The character display determination unit 50 determines whether or not the character data is set to be displayed in the projection image by the operation of the operation device 3A by the user of the projector 1A.
Based on the result of determination by the character display determination unit 50, the image adjustment unit 45 </ b> A as an image composition unit converts light emitted from the light source lamp 25 by the liquid crystal panel 23 from input image data generated by the image generation unit 43 </ b> A. Image data for modulation is generated, and the generated image data is stored in the video memory 46.

Specifically, when the character display determination unit 50 determines that the character data is not set to be displayed in the projection image, the image adjustment unit 45A stores the input image data in the video memory 46.
On the other hand, when the image adjustment unit 45A determines that the character display determination unit 50 has set the character data to be displayed in the projected image, the character acquired by the image generation unit 43A in the input image data Image data composed of the data is synthesized to generate synthesized image data, and this synthesized image data is stored in the video memory 46.

FIG. 5 is a diagram illustrating an example of a projection image based on the combined image data combined by the image adjustment unit 45A.
Here, as a case where the image adjustment unit 45A synthesizes image data composed of character data with input image data, for example, there are the following cases.
For example, when the user of the projector 1A sets the character data to be displayed in the lower part of the projection image via the operation device 3A, the image adjustment unit 45A displays the screen Sc as shown in FIG. Image data composed of character data is combined with input image data so that an image PB composed of character data is inserted into the lower portion of the displayed projection image P2.
Note that when the image adjustment unit 45A generates composite image data by combining image data composed of character data with input image data, the image adjustment unit 45A indicates to the image region detection unit 47 that the composite image data has been generated. Output synthesis information.

  Then, the image area detection unit 47 detects an image data area corresponding to the image data obtained by excluding the image data composed of the character data from the composite image data based on the synthesis information output from the image adjustment unit 45. Note that the image data area corresponding to the image data excluding the image data composed of the character data from the composite image data is the image of the portion excluding the image PB composed of the character data in the projection image P2 in FIG. PU.

[Dimmer control process of projector]
Next, dimming control processing of the projector 1A will be described with reference to FIG.
FIG. 6 is a flowchart showing the light control processing of the projector 1A.
When an image data signal is input to projector 1A, input image data is generated by image generation unit 43A, and character data superimposed on the image data signal is acquired. Then, the projector 1A performs the dimming control process by executing the following steps S11 to S5 in accordance with the dimming control program stored in the main memory 41.

When the input image data is generated by the image generation unit 43A, the character display determination unit 50 determines whether or not the character data is set to be displayed in the projection image by the operation of the operation device 3A by the user of the projector 1A. (Character display determination step S11).
Next, the image adjustment unit 45A modulates the light emitted from the light source lamp 25 by the liquid crystal panel 23 from the input image data generated by the image generation unit 43A based on the determination result by the character display determination unit 50. Image data is generated, and the generated image data is stored in the video memory 46 (image data generation step S12).

Specifically, when the character display determination unit 50 determines that the character data is not set to be displayed in the projection image, the image adjustment unit 45A stores the input image data in the video memory 46 ( Input image data storage step S121).
On the other hand, when the image adjustment unit 45A determines that the character display determination unit 50 has set the character data to be displayed in the projected image, the character acquired by the image generation unit 43A in the input image data Image data composed of data is synthesized (character image data synthesis step S122).
When predetermined image data is synthesized with the input image data and the synthesized image data is generated, the image adjustment unit 45A stores the synthesized image data in the video memory 46 (synthesized image data storage step S123).
In the present embodiment, the image composition step includes step S122 and step S123.
When the input image data or the composite image data is stored in the video memory 46, the projector 1A executes steps S3 to S5.
The dimming control process is performed by executing steps S11 to S5 as described above.

The projector 1A according to the present embodiment has the following effects.
In this embodiment as well, the same actions and effects as (1) of the first embodiment can be obtained, and the following actions and effects can be obtained.
That is, even when image data composed of character data is combined with input image data, the light control device 22 can adjust the amount of light appropriately.

[Modification of Embodiment]
The present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In each of the above embodiments, the image data composed of the image data indicating the black color and the character data is exemplified as the image data combined with the input image data. However, the image data to be combined is, for example, an electronic program guide. For example, the image data may be image data combined with input image data.
In each of the embodiments described above, the luminance calculation unit 48 calculates the average luminance of the image data area detected by the image area detection unit 47. For example, the luminance calculation unit 48 acquires representative luminance using a histogram or the like. In short, the brightness of the image information area detected by the image area detection unit may be acquired.

In each of the embodiments, the image area detection unit 47 excludes image data including black image data and character data from the composite image data based on the composite information output by the image adjustment units 45 and 45A. An image data area was detected. On the other hand, for example, image data automatically indicating black by image processing, image data composed of character data, or the like is detected, and composed of image data and character data indicating black from the composite image data. An image data area excluding image data may be detected. In short, the image area detection unit only needs to be able to detect an image information area obtained by removing predetermined image information from the composite image information.
In each of the embodiments, the light control device 22 is configured by a light shielding plate. For example, the light control device 22 adjusts the amount of light emitted from the light source lamp by adjusting the drive current for driving the light source lamp. It may be configured. In short, it is only necessary that the amount of light incident on the light modulation device can be adjusted.

In each of the above embodiments, the transmissive liquid crystal panel 23 is employed. However, the present invention is not limited to this, and a reflective liquid crystal panel may be employed, or a digital micromirror device (DMD) may be employed. Good. DMD is a trademark of Texas Instruments Incorporated.
In each of the embodiments described above, the three liquid crystal panels 23 are provided. However, the present invention is not limited to this, and only one liquid crystal panel 23 is provided. Two liquid crystal panels 23 are provided. Four or more liquid crystals are provided. The panel 23 may be provided.

  The present invention can be used for a projector, and in particular, can be suitably used for a projector including a light control device.

1 is a block diagram showing a schematic configuration of a projector according to a first embodiment of the invention. The figure which shows an example of the projection image based on the synthesized image data synthesize | combined by the image adjustment part which concerns on the said embodiment. 6 is a flowchart showing light control processing of the projector according to the embodiment. The block diagram which shows schematic structure of the projector which concerns on 2nd Embodiment of this invention. The figure which shows an example of the projection image based on the synthesized image data synthesize | combined by the image adjustment part which concerns on the said embodiment. 6 is a flowchart showing light control processing of the projector according to the embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,1A ... Projector, 4, 4A ... Control device, 21 ... Light source device, 22 ... Light control device, 23 ... Liquid crystal panel (light modulation device), 24 ... Projection optical device, 44 ... Aspect ratio determination part, 45, 45A ... image adjustment unit (image synthesis unit), 47 ... image area detection unit, 48 ... luminance calculation unit (luminance acquisition unit), 49 ... dimming control unit, S22 ... black image data synthesis step, S122 ... character image data synthesis step , S23, S123 ... composite image data storage step, S3 ... image region detection step, S4 ... luminance calculation step (luminance acquisition step), S5 ... dimming control step.

Claims (5)

A light source device; a light modulation device that modulates light emitted from the light source device according to image information to form an optical image; a projection optical device that magnifies and projects the formed optical image; and the light modulation device A projector comprising a light control device for adjusting the amount of light to be controlled and a control device for controlling these devices,
The controller is
An image composition unit that synthesizes predetermined image information with input image information input to the projector, and generates composite image information;
An image area detection unit for detecting an image information area corresponding to image information obtained by removing the predetermined image information from the composite image information;
A luminance acquisition unit for acquiring the luminance of the image information region detected by the image region detection unit;
A projector comprising: a dimming control unit that causes the dimming device to adjust the light amount based on the luminance acquired by the luminance acquisition unit. The projector according to claim 1, wherein
The controller is
An aspect ratio determination unit that determines whether an aspect ratio of an image related to the input image information matches an aspect ratio of the light modulation device;
When the aspect ratio determination unit determines that the aspect ratio of the image related to the input image information does not match the aspect ratio of the light modulation device, the image composition unit determines the aspect ratio of the image related to the composite image information. In order to match the aspect ratio of the light modulation device, the input image information is combined with image information indicating black,
The projector, wherein the image area detection unit detects an image information area obtained by removing image information indicating the black color from the composite image information. A light source device; a light modulation device that modulates light emitted from the light source device according to image information to form an optical image; a projection optical device that magnifies and projects the formed optical image; and the light modulation device A dimming control method for a projector comprising a dimming device for adjusting the amount of light to be controlled and a control device for controlling these devices,
An image synthesis step of generating predetermined image information by combining predetermined image information with input image information input to the projector;
An image region detection step of detecting an image information region corresponding to image information obtained by removing the predetermined image information from the composite image information;
A luminance acquisition step of acquiring the luminance of the image information area detected by the image area detection step;
A dimming control method for a projector, comprising: performing a dimming control step for causing the dimming device to adjust the light amount based on the luminance acquired in the luminance acquisition step. A light source device; a light modulation device that modulates light emitted from the light source device according to image information to form an optical image; a projection optical device that magnifies and projects the formed optical image; and the light modulation device A dimming control program for a projector comprising a dimming device for adjusting the amount of light to be controlled and a control device for controlling these devices,
In the control device,
An image synthesis step of generating predetermined image information by combining predetermined image information with input image information input to the projector;
An image region detection step of detecting an image information region corresponding to image information obtained by removing the predetermined image information from the composite image information;
A luminance acquisition step of acquiring the luminance of the image information area detected by the image area detection step;
A dimming control program for a projector, wherein the dimming control step for causing the dimming device to adjust the light amount is executed based on the luminance acquired in the luminance acquisition step.   A recording medium comprising the dimming control program according to claim 4 recorded on a computer in a readable manner.

Images