JP2007212946A - Projector, projection method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To project and display color images with correct color balance at all times while using such a light source which emits the light beams from a plurality of colors of light emitting diodes in a time-division manner. <P>SOLUTION: The projector includes: a light source unit 28 which emits light for each color from a plurality of the colors of the light emitting diodes 29R, 29G, 29B in a time-division manner; a projection system which includes a micromirror element 27 and a projection lens 12 forming and projecting the images for a plurality of colors in a time-division manner by using the light from the light source 28, a photographing system which includes a photographing lens 13, CCD lens 13, and a process circuit 34 acquiring luminance for each color of the image projected by the projection system, and a control part 33 which controls the projection state of the image for each color according to each luminance of the plurality of the colors obtained by the photographing system. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a projection apparatus, a projection method, and a program using light emitting elements of a plurality of colors as light sources.

  Conventionally, a projector device generally uses a discharge lamp such as a high-pressure mercury lamp as a light source for obtaining high-intensity white light. This type of discharge lamp is not only large in terms of circuit configuration because it must be driven by applying a very high voltage, but also generates a large amount of heat and requires strict temperature control. However, the lamp itself is expensive, and the manufacturing cost and running cost are high.

  On the other hand, in recent years, light emitting diodes have higher brightness and more colors, and are being used as light sources for projector apparatuses.

For example, a plurality of light emitting diodes arranged to form a surface of a light source of a predetermined size for the purpose of providing a light source such as a projector that can be made redundant, consumes less power, and has a long light source lifetime. In addition, a technique is considered in which a lens provided at the tip of each light emitting diode is provided so that light emitted from each light emitting diode becomes parallel light. (For example, Patent Document 1)
JP 2005-017576 A

  The technology described in the above patent document is considered on the premise that a white light emitting diode is basically used.

  On the other hand, for example, a field sequential method in which light emitting diodes of three colors R (red), G (green), and B (blue) are driven in a time-division manner, or a DLP (Digital Light Processing) (registered trademark) method, etc. When the light emitting brightness of each light emitting diode changes due to aging or individual differences, the color balance of the entire image may be lost and normal image projection may not be performed.

  The present invention has been made in view of the above circumstances, and the object of the present invention is to always correct a color image while using a light source that emits light from a plurality of light emitting elements in a time-sharing manner. To provide a projection device, a projection method, and a program capable of performing projection display with color balance.

  According to a first aspect of the present invention, there is provided a light source that emits light in a time division manner for each color from light emitting elements of a plurality of colors, and a projection that forms and projects an image for each of the plurality of colors in a time division manner using the light from the light source. Means, acquisition means for acquiring the brightness for each color of the image projected by the projection means, and control means for controlling the projection state of the image for each color according to each brightness of the plurality of colors obtained by the acquisition means. It is characterized by having.

  According to a second aspect of the present invention, in the first aspect of the present invention, the acquisition means includes a photographing means for photographing an image projected by the projecting means, and luminances of a plurality of colors from the image obtained by the photographing means. And a luminance calculating means for calculating the level.

  According to a third aspect of the present invention, there is provided a light source that emits light in a time division manner for each color from light emitting elements of a plurality of colors, and a projection that forms and projects an image for each of the plurality of colors in a time division manner using the light from the light source. Means for managing the light emission drive time of the light emitting elements of the plurality of colors of the light source for each color, and control means for controlling the projection state of the image for each color in accordance with the management contents in the management means. It is characterized by that.

  According to a fourth aspect of the present invention, there is provided a light source that emits light in a time division manner for each color from light emitting elements of a plurality of colors, and a projection that forms and projects an image for each of the plurality of colors in a time division manner using the light from the light source. And a management means for managing the temperature of the light emitting elements of the plurality of colors of the light source for each color, and a control means for controlling the projection state of the image for each color according to the management contents in the management means. It is characterized by.

  According to a fifth aspect of the invention, in the invention according to any one of the first, third, and fourth aspects, the control means controls driving conditions of a plurality of light emitting elements of the light source.

  According to a sixth aspect of the present invention, in the invention according to any one of the first, third, and fourth aspects, the control unit controls a projection condition of an image for each of a plurality of colors by the projection unit.

  The invention according to claim 7 includes a light source that emits light in a time-division manner from each of the plurality of light emitting elements for each color, and uses the light from the light source to form and project an image for each of the plurality of colors in a time division manner. A method for projecting in an apparatus, an acquisition step for acquiring the luminance for each of a plurality of colors of a projection image, and a control for controlling the projection state of the image for each color according to each luminance of the plurality of colors obtained in the acquisition step And a process.

  The invention according to claim 8 includes a light source that emits light from a plurality of light emitting elements in a time division manner for each color, and uses the light from the light source to form and project an image for each of the plurality of colors in a time division manner. This is a projection method in the apparatus, which manages the light emission drive time of the light emitting elements of the plurality of colors of the light source for each color, and controls the projection state of the image for each color according to the management contents in this management process And a control process.

  The invention according to claim 9 includes a light source that emits light from a plurality of light emitting elements in a time division manner for each color, and uses the light from the light source to form and project an image for each of the plurality of colors in a time division manner. A method for projecting in an apparatus, a management process for managing the temperature of light emitting elements of a plurality of colors of the light source for each color, and a control for controlling the projection state of an image for each color according to the management contents in this management process And a process.

  The invention according to claim 10 includes a light source that emits light in a time-division manner from a plurality of light emitting elements for each color, and uses the light from the light source to form and project an image for each of the colors in a time division manner. A program executed by a computer built in the apparatus, which obtains the luminance for each of a plurality of colors of a projection image, and colors the projection state of the image according to each luminance of the plurality of colors obtained in this acquisition step A control step for controlling each time is executed by a computer.

  The invention described in claim 11 includes a light source that emits light in a time-division manner for each color from a plurality of light-emitting elements, and uses the light from the light source to form and project an image for each of the colors in a time-division manner. A program executed by a computer built in the apparatus, which manages a light emission driving time of each of the light emitting elements of the light source for each color, and a projection state of an image according to the management contents in this management step And a control step for controlling the color for each color.

  The invention according to claim 12 includes a light source that emits light in a time-division manner for each color from a plurality of light-emitting elements, and uses the light from the light source to form and project an image for each of the colors in a time-division manner. A program executed by a computer incorporated in the apparatus, which manages the temperature of the light emitting elements of the plurality of colors of the light source for each color, and colors the projection state of the image according to the management contents in the management step A control step for controlling each time is executed by a computer.

  According to the first aspect of the present invention, in a projection apparatus using a light source that emits light from light emitting elements of a plurality of colors in a time-sharing manner, even when the light emission luminance of the light emitting element of the light source changes due to deterioration over time, It is possible to always project and display a color image with a correct color balance.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, in order to calculate the luminance level of each color from the actually projected image instead of the light source side, not only the light source side, A color image can always be projected with a correct color balance in consideration of the installation environment of the apparatus such as external light and the color of the projection target.

  According to the third aspect of the present invention, even when the light emission luminance of the light emitting element of the light source changes due to deterioration over time, it is possible to always project and display a color image with a correct color balance by accurately grasping the state. Is possible.

  According to the fourth aspect of the present invention, it is possible to always project and display a color image with a correct color balance by accurately grasping the state even when the light emission luminance of the light emitting element of the light source changes depending on the temperature environment. .

  According to the invention described in claim 5, in addition to the effect of the invention described in any one of claims 1, 3 and 4, by controlling the driving condition of the light emitting element on the light source side, Since the brightness control is performed, the control can be performed directly and more easily.

  According to the invention described in claim 6, in addition to the effect of the invention described in any one of claims 1, 3 and 4, the result is obtained by controlling the gradation value at the time of image projection or the projection time for each color. Since brightness control is performed for each color of the projected image, more accurate adjustment is possible.

  According to the invention of claim 7, in a projection apparatus using a light source that emits light from light emitting elements of a plurality of colors in a time division manner, even when the light emission luminance of the light emitting element of the light source changes due to deterioration over time, It is possible to always project and display a color image with a correct color balance.

  According to the eighth aspect of the present invention, even when the light emission luminance of the light emitting element of the light source changes due to deterioration over time, it is possible to always project and display a color image with a correct color balance by accurately grasping the state. Is possible.

  According to the ninth aspect of the invention, even when the light emission luminance of the light emitting element of the light source changes depending on the temperature environment, it is possible to always project and display a color image with a correct color balance by accurately grasping the state. It becomes.

  According to the invention of claim 10, in a projection apparatus using a light source that emits light in a time-sharing manner from light emitting elements of a plurality of colors, even when the light emission luminance of the light emitting element of the light source changes due to deterioration over time, It is possible to always project and display a color image with a correct color balance.

  According to the eleventh aspect of the invention, even when the light emission luminance of the light emitting element of the light source changes due to deterioration with time, by accurately grasping the state, a color image is always projected and displayed with a correct color balance. Is possible.

  According to the twelfth aspect of the present invention, even when the light emission luminance of the light emitting element of the light source changes depending on the temperature environment, it is possible to always project and display a color image with a correct color balance by accurately grasping the state. It becomes.

(First embodiment)
A first embodiment when the present invention is applied to a projector apparatus will be described below with reference to the drawings.

  FIG. 1 shows the external configuration of the projector apparatus 10 according to the embodiment, and mainly shows the configuration of the front and top surfaces of the housing. As shown in the figure, a projection lens 12 and a photographing lens 13 are embedded on the right side of a part of the front surface of the rectangular parallelepiped main body casing 11. An Ir light receiver 14 is disposed on the front and left end sides of the main casing 11.

  The projection lens 12 is for projecting a light image formed by a spatial light modulation element such as a micromirror element, which will be described later, onto an object such as a screen, and here, a focus position and a zoom position (projection angle of view). Is arbitrarily variable.

  The photographing lens 13 is for photographing an image projected and displayed by the projection lens 12. The photographing lens 13 can also change the focus position and the zoom position, and in particular, the zoom position is the zoom of the projection lens 12. It is controlled in conjunction with the position, and is controlled so as to always have an imaging range corresponding to the size of the image projected from the projection lens 12.

  The Ir light receiving unit 14 receives an infrared light (Ir) signal on which a key operation signal from a remote controller of the projector device 10 (not shown) is superimposed.

A key switch unit 15 and a speaker 16 are disposed on the upper surface of the main body casing 11.
The key switch unit 15 includes various key switches for instructing power on / off of the apparatus, input switching, automatic focusing, automatic keystone correction, and the like.

  The speaker 16 emits a sound of the input audio signal and a beep sound during operation.

Although not shown, an input / output connector portion, an Ir light receiving portion similar to the Ir light receiving portion 14, and an AC adapter connecting portion are disposed on the back surface of the main body casing 11.
The input / output connector unit includes, for example, a USB terminal for connection to an external device such as a personal computer, a mini D-SUB terminal for video input, an S terminal, an RCA terminal, a stereo mini terminal for audio input, and the like. .

  The AC adapter connection unit connects a cable from an AC adapter (not shown) serving as a power source.

Next, the functional configuration of the electronic circuit of the projector apparatus 10 will be described with reference to FIG.
In the figure, image signals of various standards input from the input / output connector unit 21 are unified into image signals of a predetermined format by the image conversion unit 23 via the input / output interface (I / F) 22 and the system bus SB. Later, it is sent to the projection encoder 24.

  The projection encoder 24 sequentially develops and stores the transmitted image signals on the video RAM 25, and then periodically reads out the image signals from the video RAM 25 to generate a video signal according to a general data format. And output to the projection image processing unit 26.

  The projected image processing unit 26 uses the video signal to appropriately multiply the frame rate, for example, 60 [frames / second], the number of color component divisions, and the number of display gradations, and a spatial light modulation element with faster time division driving. For example, the micromirror element 27 which is (SOM) is driven to display.

  With respect to the micromirror element 27, the R, G, and B light emitting diodes 29R, 29G, and 29B arranged in the light source unit 28 are driven in a time-sharing manner for each color. 30. By irradiating through the mirror 31, an optical image is formed by the reflected light, and projected and displayed on a screen (not shown) through the projection lens 12.

  The light emitting diodes 29R, 29G, and 29B are driven to be lit in a time-sharing manner for each emission color by the projection light processing unit 32 as described above.

  The control unit 33 controls all the operations of the above circuits. The control unit 33 includes a CPU, a non-volatile memory that stores an operation program executed by the CPU including processing of a projection operation and a photographing operation, which will be described later, and a work memory.

  The control unit 33 is also connected to a process circuit 34, an image recording unit 35, and an audio processing unit 36 via a system bus SB.

  The process circuit 34 receives an output of a CCD 37 as an image pickup device that photoelectrically converts a light image that is behind the photographing optical axis of the photographing lens 13 and is formed by the photographing lens 13, and receives an analog image signal from the CCD 37. Is digitized, and color process processing including pixel interpolation processing and γ correction processing is performed to generate digital luminance signals Y and color difference signals Cb and Cr, which are output to the image conversion unit 23 via the system bus SB. To do.

  The image converting unit 23 compresses the luminance and color difference signals by a process such as ADCT or Huffman coding, and writes the obtained image data into an image recording unit 35 that is mounted as a recording medium of the projector device 10. The image recording unit 35 is composed of, for example, a flash memory and stores image data obtained by photographing.

  The sound processing unit 36 includes a sound source circuit such as a PCM sound source, converts the sound data given during the projection operation into an analog signal, drives the speaker 16 to emit a loud sound, or generates a beep sound if necessary.

  Each key operation signal in the key switch (SW) unit 15 is directly input to the control unit 33, and a signal from the Ir light receiving unit 38 is also directly input. The Ir light receiving unit 38 includes the Ir light receiving unit 14 and an Ir light receiving unit provided on the back side of the main body casing 11. The infrared light reception signal is converted into a code signal and sent to the control unit 33.

Next, the operation of the above embodiment will be described.
FIG. 3 shows the processing contents of light emission luminance adjustment of the light emitting diodes 29R, 29G, and 29B automatically executed as an initial setting when the power is turned on. The control is mainly performed by the control unit 33 and the control unit 33 below. To the projection light processing unit 32.

  At the beginning of power-on, first, only the plurality of light emitting diodes 29R that emit red light are driven to light at a rated current (step A01). At this time, an image signal that provides full gradation for all pixels is given to the projection encoder 24 and the image is displayed by the micromirror element 27, so that an image of red on the entire surface is projected by the projection lens 12.

  This projected image is picked up by the photographing lens 13 and the CCD 37 (step A02), and after acquiring red color image data and recording it in the image recording unit 35 (step A03), the light emitting diodes 29R that emit red light are turned on. Is stopped (step A04).

  Similarly, only the plurality of light emitting diodes 29G that emit green light are driven to be lit at the rated current (step A05), and an image with all the pixels full gradation is displayed on the micromirror element 27 to project an image of green on the entire surface. Projection is performed by the lens 12.

  The projected image is picked up by the photographing lens 13 and the CCD 37 (step A06), and after acquiring the image data of one green color and recording it in the image recording unit 35 (step A07), the plurality of light emitting diodes 29G that emit green light are turned on. Is stopped (step A08).

  Similarly, only a plurality of light emitting diodes 29B that emit blue light are driven to be lit at a rated current (step A09), and an image with full gradation of all pixels is displayed on the micromirror element 27, and a blue-colored image is projected on the entire surface. 12 to project.

  This projected image is picked up by the photographic lens 13 and the CCD 37 (step A10), and after acquiring blue image data and recording it in the image recording unit 35 (step A11), a plurality of light emitting diodes 29G emitting blue light are turned on. Is stopped (step A12).

  When the red, green, and blue images are recorded in the image recording unit 35 in this way, the average gradation levels of the recorded images are obtained and compared with each other (step A13), and red, green, and blue 3 are determined based on the comparison result. It is determined whether or not the color is within a predetermined color balance range (step A14).

  If it is determined that the color balance of the three colors is not within the predetermined range and the color balance is lost, first, the drive currents of the plurality of light emitting diodes 29R that emit red light are determined according to the comparison result. The projection light processing unit 32 adjusts the increase / decrease (step A15).

  Specifically, when it is determined that the average gradation level of the red image data has not reached a value that has a predetermined color balance as compared with the other levels of blue and green, red light is used. If the drive current of all the light emitting diodes 29R to be emitted is set to be increased by a fixed value by the projection light processing unit 32, on the contrary, if it is determined that the value exceeds a predetermined color balance relationship, all the light emitting red light is emitted. The drive current of the light emitting diode 29R is set to decrease by a fixed value by the projection light processing unit 32.

  Similarly, the drive currents of the plurality of light emitting diodes 29G that emit green light and the plurality of light emitting diodes 29B that emit blue light are also adjusted to increase or decrease according to the comparison result (steps A16 and A17).

  After the adjustment of the drive currents of the light emitting diodes 29R, 29G, and 29B is completed in this way, the process returns to the process from the step A01 again, and an image for each color light is obtained again to compare the gradation levels. Accordingly, a process of adjusting the driving current for each of the light emitting diodes 29R, 29G, and 29B is executed.

However, when the light emitting diodes 29R, 29G, and 29B emit light with the correct color balance and the gradation levels of the three photographic images of red, green, and blue are within a predetermined range, this is determined in step A14, and the light source is turned on. For example, the fact that the light emitting diodes 29R, 29G, and 29B constituting the light emitting diodes are adjusted so as to be lit and driven with a correct color balance,
"Color balance adjustment is over
You can start projecting. "
The projected message is displayed for a fixed time, for example, 5 seconds (step A18) by the image of the guide message using the character string as described above (step A18), and the processing of FIG.

  Thereafter, the process shifts to a normal projection operation for projecting an image input from an external device (not shown) connected to the input / output connector unit 21.

  As described above, a projector device using a light source in which a plurality of light emitting diodes 29R, 29G, and 29B for each of the three colors R, G, and B are arranged as the light source unit 28, and the light of these three colors is emitted in a time division manner. Even when the luminance of the light emitting diode changes due to secular change or the like, it is possible to reliably recognize this and always display a color image with a correct color balance.

  In this case, the brightness of the resulting projected image is controlled by adjusting the driving conditions of the light emitting diodes 29R, 29G, and 29B on the light source side, specifically, the driving current, so that the control becomes simpler.

  In addition, in this embodiment, since the actual projected image is captured and the luminance level of each color is calculated instead of the color balance on the light source unit 28 side, not only on the light source side but also on the outside In consideration of the installation environment of the projector device such as light, it is possible to always project a color image with a correct color balance.

  Furthermore, in the present embodiment, light source diodes 29R, 29G, and 29B of R, G, and B colors are arranged in the light source unit 28, and light emission for each color is obtained in a time division manner by driving them in time division. Therefore, an intermediate optical member such as a color filter can be eliminated, and the light emission luminance of the light emitting diode can be efficiently utilized for projection light.

  In the above-described embodiment, the light emission luminance for each color is adjusted by increasing / decreasing the drive current of the light emitting diodes 29R, 29G, and 29B. However, the present invention is not limited to this, and the micromirror element 27 is not limited thereto. It is also possible to cope with this by controlling the gradation of the image to be displayed.

Hereinafter, a modified example of the operation of the present embodiment will be described with reference to FIG. 4 instead of FIG.
FIG. 4 shows the processing contents of the display gradation adjustment in the micromirror element 27, which is automatically executed as an initial setting when the power is turned on. The control is mainly performed under the control unit 33 and the control unit 33. The projection image processing unit 26 performs this operation.

  At the beginning of power-on, first, only the plurality of light emitting diodes 29R that emit red light are driven to light at a rated current (step B01). At this time, an image signal that provides full gradation for all pixels is given to the projection encoder 24 and the image is displayed by the micromirror element 27, so that an image of red on the entire surface is projected by the projection lens 12.

  This projected image is picked up by the photographing lens 13 and the CCD 37 (step B02), and after acquiring red-color image data and recording it in the image recording unit 35 (step B03), a plurality of light emitting diodes 29R emitting red light are turned on. Is stopped (step B04).

  Similarly, only the plurality of light emitting diodes 29G that emit green light are driven to be lit at the rated current (step B05), and an image having a full gradation of all pixels is displayed by the micromirror element 27, thereby projecting an entire green image. Projection is performed by the lens 12.

  This projected image is picked up by the photographing lens 13 and the CCD 37 (step B06), and after acquiring the green image data and recording it in the image recording unit 35 (step B07), the plurality of light emitting diodes 29G that emit green light are turned on. Is stopped (step B08).

  Similarly, only a plurality of light emitting diodes 29B that emit blue light are driven to be lit at a rated current (step B09), and an image with full gradation of all pixels is displayed on the micromirror element 27, and a blue-colored image is projected on the entire surface. 12 to project.

  This projected image is picked up by the photographic lens 13 and the CCD 37 (step B10), and after acquiring the image data of one blue color and recording it in the image recording unit 35 (step B11), the light emitting diodes 29G that emit blue light are turned on. Is stopped (step B12).

  When the red, green, and blue images are recorded in the image recording unit 35 in this way, the average gradation levels of the recorded images are obtained and compared with each other (step B13), and red, green, and blue 3 are determined based on the comparison result. It is determined whether or not the color is within a predetermined color balance range (step B14).

  If it is determined that the color balance of the three colors is not within the predetermined range and the color balance is lost, the color component determined to have a lower gradation level than the predetermined color balance The degree of balance with respect to the gradation levels of the other color components is calculated, and the display drive times performed in the R, G, B time division are mutually adjusted (offset adjustment) based on the calculation result, or the image to be displayed In the projection image processing unit 26 (step B15), the process returns to the process from step B01 again, and an image for each color light is again obtained. After the income is obtained, the gradation levels are compared, and if necessary, the projection image processing unit 26 adjusts the display gradation of each image in the micromirror element 27.

However, each color image having a correct color balance is displayed by the micromirror element 27, and a light image formed thereby is projected through the projection lens 12, so that the gradation level of each of the red, green, and blue photographic images is displayed. Is within the predetermined range, this is determined in step B14, and the fact that the display element that forms the optical image has been adjusted to display and drive with the correct color balance, for example,
"Color balance adjustment is over
You can start projecting. "
A projected message is displayed for a predetermined time, for example, 5 [seconds], using the image of the guide message using the character string (step B16), and the processing of FIG. 4 is completed.

  Thereafter, the process shifts to a normal projection operation for projecting an image input from an external device (not shown) connected to the input / output connector unit 21.

  As described above, instead of adjusting the light emission luminances of the light emitting diodes 29R, 29G, and 29B on the light source side as in the process of FIG. 3, the micromirror elements 27 that form a light image have mutual mutual color components. Since the luminance control for each color component of the resulting projected image is performed by time (offset) control or gradation (gain) control of the display image, finer and more accurate adjustment is possible.

  Note that the time (offset) control or gradation (gain) control of the mutual display image for each color component in the micromirror element 27 that forms the optical image is not performed selectively but only one of them. It may be executed simultaneously.

  In the above embodiment, the light source unit 28 has the light emitting diodes 29R, 29G, and 29B of three colors R, G, and B, and these light sources emit light of R, G, and B by time-division emission driving. In addition to the above, the light source is obtained by arranging only a plurality of light emitting diodes that emit white light and transmitting only the appropriate color components in a time-sharing manner through a color wheel that rotates the light emission. The technique of the first embodiment may be applied.

  In that case, since all the light emitting surfaces of the light source can be arranged with the light emitting diodes so that they can always emit light, the same device using a brighter light source even if the amount of light attenuated by transmitting through the color wheel is subtracted Can be realized.

(Second Embodiment)
A second embodiment in which the present invention is applied to a projector apparatus will be described below with reference to the drawings.

  FIG. 5 shows an external configuration of the projector apparatus 10 ′ according to the present embodiment, which is basically the same as that in FIG. 1 except that the photographing lens 13 is not present. The description is omitted because the same reference numerals are used.

  Similarly, FIG. 6 explains the functional configuration of the electronic circuit of the projector apparatus 10 ', except that the photographing lens 13, the CCD 37, the process circuit 34, and the image recording unit 35 do not exist as compared with FIG. Therefore, detailed description thereof is omitted.

  However, a table as shown in FIG. 7 is fixedly stored in the flash memory inside the control unit 33 as a part of the operation program. That is, this figure shows drive currents corresponding to the accumulated drive times of the light emitting diodes 29R, 29G, and 29B.

  In addition, in the control unit 33, a timer for counting the power-on time is set in the work memory, and a register for storing the accumulated value of the time-measured value of the timer in a nonvolatile manner even when the power is turned off is set in the flash memory. It is assumed that

Next, the operation of the above embodiment will be described.
FIG. 8 shows the processing contents related to the lighting drive of the light emitting diodes 29R, 29G, and 29B during the period from when the power is turned on to when the power is turned off.

  When the power is turned on by operating the power key of the key switch unit 15, the control unit 33 starts a time measuring operation by a timer set in the internal work memory (step C01).

  At the same time, the control unit 33 reads the accumulated drive time of each of the light emitting diodes 29R, 29G, and 29B from the register set in the internal flash memory (step C02), and based on each read accumulated drive time, the control unit 33 reads the accumulated drive time. With reference to the table shown in FIG. 7, the drive current values of the light emitting diodes 29R, 29G, and 29B are read (step C03).

  Then, the projection light processing unit 32 is set so that the light emitting diodes 29R, 29G, and 29B are driven to emit light in accordance with the read drive current values (step C04).

  Assuming that the processing accompanying the power-on is completed as described above, the process shifts to the normal projection operation, and this time, it is determined whether or not the power-off operation has been performed (step C05). stand by.

  When the power is turned off by the operation of the power key, each of the light emitting diodes 29R, 29G, and 29B stored in the register is stored using the current time value of the timer that started time measurement in step C01. The accumulated drive time is updated and stored (step C06), and the process relating to the lighting drive of the light emitting diodes 29R, 29G, and 29B in FIG. 8 is completed as described above, and the normal power-off process is executed.

  In this way, by grasping in advance the degree of deterioration with time of each light emitting diode 29R, 29G, 29B as a product and managing the integrated driving time, the light emission luminance for each of the light emitting diodes 29R, 29G, 29B due to deterioration with time Therefore, it is possible to project a color image with a correct color balance.

  Although not shown in the above embodiment, when the light emitting diodes 29R, 29G, and 29B exceed a preset service life limit (for example, 50,000 hours), the light emitting diodes 29R, 29G, and 29B are removed. A guide message for exchanging with a new one may be displayed.

  Further, in step C04, digital setting for offset adjustment or gain adjustment as shown in the modification of the first embodiment may be performed instead of driving current control. In that case, the table of FIG. 7 only needs to indicate the offset adjustment values or gain adjustment values of R, G, and B according to the accumulated drive time.

(Third embodiment)
A third embodiment when the present invention is applied to a projector apparatus will be described below with reference to the drawings.

  Note that the external configuration of the projector device 10 ″ according to the present embodiment is basically the same as that shown in FIG. 5 described above, and the same reference numerals are used for the same parts, and the illustration and description thereof are omitted. .

  Similarly, FIG. 9 illustrates the functional configuration of the electronic circuit of the projector apparatus 10 ″ according to the present embodiment. Compared to FIG. 2, the photographing lens 13, the CCD 37, the process circuit 34, and the image recording unit 35 are illustrated. Is the same except that there is no symbol, and therefore the same reference numerals are used for the same parts, and detailed description thereof is omitted.

  Thus, the light source unit 28 is provided with temperature sensors 41R, 41G, and 41B for the light emitting diodes 29R, 29G, and 29B, and each temperature can be detected. The data is input to the unit 32, digitized, and sent to the control unit 33.

  The projection light processing unit 32 rotates the cooling fan 43 by a fan motor (M) 42 to cool the whole light emitting diodes 29R, 29G, and 29B of the light source unit 28 by the cooling air.

  Next, the operation of the above embodiment will be described.

  FIG. 10 shows the display gradation adjustment processing content in the micromirror element 27 that is automatically executed in parallel with the normal projection operation in a state where the power of the projector apparatus 10 ″ is turned on. The control is mainly performed by the control unit 33 and the projection image processing unit 26 under the control unit 33.

  Initially, the control unit 33 waits for a certain time, for example, 1 [minute], to elapse (step D01). This is determined when the predetermined time has elapsed, the temperature sensor 41R determines the temperature of the red light emitting diode 29R, the temperature sensor 41G determines the temperature of the green light emitting diode 29G, and the temperature sensor 41B determines the temperature of the blue light emitting diode 29B. Are detected (steps D02 to D04).

  After comparing the temperatures of the respective light emitting diodes 29R, 29G, and 29B thus obtained with the reference values (step D05), is the temperature of at least one kind of light emitting diode increased by a predetermined threshold or more from the reference values? It is determined whether or not (step D06).

  That is, the light-emitting diode generates heat although not as high as a discharge lamp such as a high-pressure mercury lamp due to its lighting driving, and has a characteristic that the light emission luminance is lowered depending on the degree of heat generation. Therefore, it is determined for each color whether or not the light emitting diodes 29R, 29G, and 29B are generating heat enough to cause a decrease in luminance.

  If it is determined in step D06 that there is no light emitting diode whose temperature has risen above the threshold value from the reference value, the process returns to step D01 again because there is no particular problem.

  On the other hand, if it is determined in step D06 that at least one of the light emitting diodes 29R, 29G, and 29B has increased from the reference value by a preset threshold value or more, it is determined that the temperature is high. Since it is considered that the luminance of each type of light emitting diode is lowered, each display driving time performed in time division of R, G, B in order to generate the light emitting diode with a luminance higher by a predetermined value than the others is set. The projection image processing unit 26 performs digital setting for adjusting each other (offset adjustment) or adjusting the gradation value of the image to be displayed (gain adjustment) (step D17). To increase the rotation speed of the fan motor 42 and increase the cooling capacity of the light source unit 28 by the cooling fan 43 (step D08). Returning to the process from-up D01, again every fixed time for each color of light emitting diodes 29R, 29G, 29B perform temperature detection, it executes the process of.

  As described above, even when the light emission luminance of the light emitting diodes 29R, 29G, and 29B of the light source changes due to the temperature change, by accurately grasping the state, it is possible to always project and display a color image with a correct color balance. Become.

  In step D07, the driving currents of the light emitting diodes 29R, 29G, and 29B of the respective colors may be adjusted instead of the digital setting.

  The first to third embodiments are all applied to a DLP (Digital Light Processing) (registered trademark) type projector device using a micromirror element as the projector device 10 (10 ′, 10 ″). However, the present invention is not limited to the projection method, and other methods, for example, a field sequential type liquid crystal projector using a transmission type monochrome liquid crystal panel as a display element for forming a light image, are similarly implemented. It is possible.

  In addition, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.

  Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, at least one of the problems described in the column of the problem to be solved by the invention can be solved, and described in the column of the effect of the invention. In a case where at least one of the obtained effects can be obtained, a configuration in which this configuration requirement is deleted can be extracted as an invention.

1 is a perspective view showing an external configuration of a projector apparatus according to a first embodiment of the present invention. The block diagram which shows the functional circuit structure of the projector apparatus which concerns on the same embodiment. The flowchart which shows the processing content regarding the light source adjustment at the time of the power-on which concerns on the embodiment. The flowchart which shows the other processing content regarding the light source adjustment at the time of the power-on which concerns on the embodiment. The perspective view which shows the external appearance structure of the projector apparatus which concerns on the 2nd Embodiment of this invention. The block diagram which shows the functional circuit structure of the projector apparatus which concerns on the same embodiment. The table which shows the relationship of the drive current corresponding to the integral drive time of each color light emitting diode which concerns on the embodiment. The flowchart which shows the processing content regarding the light source adjustment at the time of the power-on which concerns on the embodiment. The block diagram which shows the functional circuit structure of the projector apparatus which concerns on the 3rd Embodiment of this invention. The flowchart which shows the processing content regarding the light source adjustment at the time of the power-on which concerns on the embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10,10 ', 10 "... projector apparatus, 11 ... main body casing, 12 ... projection lens, 13 ... photographing lens, 14 ... Ir light-receiving part, 15 ... video RAM, 16 ... speaker, 21 ... input / output connector part, 22 ... Input / output interface (I / F), 23 ... Image conversion unit, 24 ... Projection encoder, 25 ... Video RAM, 26 ... Projection image processing unit, 27 ... Micromirror element (SOM), 28 ... Light source unit, 29R, 29G, 29B ... Light-emitting diode, 30 ... Integrator, 31 ... Mirror, 32 ... Projection light processing unit, 33 ... Control unit, 34 ... Process circuit, 35 ... Image recording unit, 36 ... Audio processing unit, 37 ... CCD, 38 ... Ir light reception 41R, 41G, 41B ... temperature sensor, 42 ... fan motor (M), 43 ... cooling fan.

Claims (12)

A light source that emits light in a time-sharing manner for each color from light emitting elements of a plurality of colors;
Projecting means for forming and projecting images of a plurality of colors in a time-sharing manner using light from the light source;
Acquisition means for acquiring the brightness for each color of the image projected by the projection means;
A projection apparatus comprising: control means for controlling the projection state of an image for each color according to each luminance of a plurality of colors obtained by the obtaining means. The acquisition means is
Photographing means for photographing the image projected by the projection means;
The projection apparatus according to claim 1, further comprising: a luminance calculation unit that calculates luminance levels of a plurality of colors from an image obtained by the photographing unit. A light source that emits light in a time-sharing manner for each color from light emitting elements of a plurality of colors;
Projecting means for forming and projecting images of a plurality of colors in a time-sharing manner using light from the light source;
Management means for managing the light emission driving time of the light emitting elements of the plurality of colors of the light source for each color;
A projection apparatus comprising: control means for controlling the projection state of an image for each color in accordance with the management content of the management means. A light source that emits light in a time-sharing manner for each color from light emitting elements of a plurality of colors;
Projecting means for forming and projecting images of a plurality of colors in a time-sharing manner using light from the light source;
Management means for managing the temperature of the light emitting elements of the plurality of colors of the light source for each color;
A projection apparatus comprising: control means for controlling the projection state of an image for each color in accordance with the management content of the management means.   5. The projection apparatus according to claim 1, wherein the control unit controls driving conditions of a plurality of light emitting elements of the light source.   5. The projection apparatus according to claim 1, wherein the control unit controls a projection condition of an image for each of a plurality of colors by the projection unit. A projection method in a projection apparatus that includes a light source that emits light in a time-sharing manner from a plurality of light-emitting elements for each color, and that forms and projects an image for each of a plurality of colors in a time-sharing manner using light from the light source. ,
An acquisition step of acquiring brightness for each of a plurality of colors of the projection image;
And a control step of controlling the projection state of the image for each color in accordance with the luminances of the plurality of colors obtained in the acquisition step. A projection method in a projection apparatus that includes a light source that emits light in a time-sharing manner from a plurality of light-emitting elements for each color, and that forms and projects an image for each of a plurality of colors in a time-sharing manner using light from the light source. ,
A management process for managing the emission drive time of the light emitting elements of the plurality of colors of the light source for each color;
And a control step of controlling the projection state of the image for each color according to the management contents in the management step. A projection method in a projection apparatus that includes a light source that emits light in a time-sharing manner from a plurality of light-emitting elements for each color, and that forms and projects an image for each of a plurality of colors in a time-sharing manner using light from the light source. ,
A management step of managing the temperature of the light emitting elements of the plurality of colors of the light source for each color;
And a control step of controlling the projection state of the image for each color according to the management contents in the management step. A computer built in a projection device that includes a light source that emits light in a time-sharing manner for each color from a plurality of light-emitting elements, and that forms and projects an image for each color in a time-sharing manner using the light from this light source. A program to
An acquisition step of acquiring brightness for each of a plurality of colors of the projection image;
A program that causes a computer to execute a control step of controlling the projection state of an image for each color in accordance with each luminance of a plurality of colors obtained in the acquisition step. A computer built in a projection device that includes a light source that emits light in a time-sharing manner for each color from a plurality of light-emitting elements, and that forms and projects an image for each color in a time-sharing manner using the light from this light source. A program to
A management step of managing the light emission drive time of each of the light emitting elements of the light source for each color;
A program that causes a computer to execute a control step of controlling the projection state of an image for each color in accordance with the management content in the management step. A computer built in a projection device that includes a light source that emits light in a time-sharing manner for each color from a plurality of light-emitting elements, and that forms and projects an image for each color in a time-sharing manner using the light from this light source. A program to
A management step of managing the temperature of the light emitting elements of the plurality of colors of the light source for each color;
A program that causes a computer to execute a control step of controlling the projection state of an image for each color according to the management contents in the management step.

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