JP2011117989A - Device and method for projection and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the further expansion of damage and an influence on the outside of a device by surely detecting that a part of an optical system is damaged due to strong light source light, even when a part of the optical system is damaged. <P>SOLUTION: The device for projection includes: a laser diode (LD) 21 which continuously generates the same wavelength light; a color wheel 23 which includes a phosphor layer formed on at least a part of the circumference of a rotation disk irradiated with light from the LD 21, to cover a prescribed mark; input systems 11 and 12 for inputting an image signal; projection systems 13 to 16, 18 and 19 which form and project an optical image corresponding to the image signal input in the input systems 11 and 12 by using light provided via the color wheel 23; a CCD 29 which is arranged to face the circumference of the rotation disk of the rotation wheel and detects the appearance of the prescribed mark covered with the phosphor layer; and a projection light processing part 31 and a CPU 32 which stop the generation of the light in the LD 21, according to the detection result of the CCD 29. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a projection apparatus, a projection method, and a program suitable for a projector apparatus using a semiconductor laser as a light source.

In a reflection-type projection image display device, a technique is considered in which a visible light source including an ultraviolet light source and a color wheel is used to irradiate each component side such as a lens and an image display element with visible light. . (Patent Document 1)
In this patent document, ultraviolet rays are irradiated to a color wheel arranged opposite from an ultraviolet light source. The color wheel includes a phosphor layer, an ultraviolet reflecting layer, and a transparent substrate. When the color wheel is irradiated with ultraviolet light, visible light is emitted from the phosphor layer of the color wheel.

JP 2008-052070 A

  Including the technology described in the above-mentioned patent documents, the rotation is stopped especially in the light source structure in which the color wheel without the phosphor layer is irradiated with laser light and the light of the desired wavelength band is emitted from the phosphor layer. Then, when the light source light is continuously irradiated to one point on the wheel, it is considered that the thermal load is concentrated and the phosphor layer is peeled off. In such a case, the laser beam is further irradiated to the position where the phosphor layer is peeled off, and the influence of the laser beam appears outside the device via another part in the image display device or a projection system lens. There is a fear.

  The present invention has been made in view of the above circumstances, and the object of the present invention is to reliably detect even if a part of the optical system is damaged by powerful light source light, and to further damage the optical system. It is an object of the present invention to provide a projection apparatus, a projection method, and a program capable of preventing the enlargement of the image and the influence on the outside of the apparatus.

  According to the first aspect of the present invention, there is provided a phosphor that covers a predetermined mark on at least a part of a circumference of a rotating disk irradiated with light from the light source that continuously generates light of the same wavelength and light from the light source. Projection for forming and projecting a light image corresponding to the image signal input by the input means, using the rotation wheel formed with the layer, the input means for inputting the image signal, and the light provided through the rotation wheel A detecting means for detecting the appearance of a predetermined mark disposed under the phosphor layer, facing the rotating disk peripheral surface of the rotating wheel, and according to a detection result of the detecting means. And control means for stopping generation of light from the light source.

  According to a second aspect of the present invention, in the first aspect of the invention, the rotating wheel is formed by coating a phosphor layer on a mark having a predetermined shape, and the detecting means has a predetermined shape of the rotating wheel. The mark is picked up by an image pickup device, and the appearance of the mark is detected by an image signal output from the image pickup device.

  According to a third aspect of the present invention, in the first aspect of the present invention, the rotating wheel is formed by coating the phosphor layer on a mark having a color tone different from that of the phosphor layer, and the detecting means is provided on the rotating wheel. A mark having a predetermined color tone is picked up by an image pickup device, and the appearance of the mark is detected by an image signal output from the image pickup device.

  According to a fourth aspect of the present invention, in the first aspect of the invention, the detecting means counts the number of detections of the predetermined mark on the rotating wheel, and the mark is detected when the count value reaches a preset value. It is characterized by detecting the appearance of.

  According to a fifth aspect of the present invention, there is provided a light source that continuously generates light having the same wavelength, and a phosphor layer that covers a predetermined mark on at least a part of the circumference of a rotating disk irradiated with light from the light source. A rotation wheel that forms the image, an input unit that inputs an image signal, and a projection unit that forms and projects a light image corresponding to the image signal input by the input unit using light provided via the rotation wheel A projection method with a projection apparatus comprising: a detection unit configured to detect the appearance of a predetermined mark covered under the phosphor layer by a detection unit disposed opposite to a rotating disk peripheral surface of the rotary wheel. And a control step of stopping generation of light from the light source in accordance with a detection result in the detection step.

  According to a sixth aspect of the present invention, there is provided a light source that continuously generates light of the same wavelength, and a phosphor layer that covers a predetermined mark on at least a part of the circumference of a rotating disk irradiated with light from the light source. A rotation wheel that forms the image, an input unit that inputs an image signal, and a projection unit that forms and projects a light image corresponding to the image signal input by the input unit using light provided via the rotation wheel A program executed by a computer incorporated in the projection apparatus provided, wherein a predetermined mark covered under the phosphor layer is displayed by a detection unit arranged to face the rotating disk peripheral surface of the rotating wheel. And a control step for stopping the generation of light from the light source in accordance with a detection result in the detection step.

  According to the present invention, even if a rotating wheel constituting a part of the optical system is damaged by a strong light source light, this is surely detected to prevent further damage and influence on the outside of the apparatus. It becomes possible to do.

1 is a block diagram showing a functional configuration of an entire data projector apparatus according to an embodiment of the present invention. The figure which shows the structure of the color wheel which concerns on the same embodiment. The flowchart which shows the content of the monitoring process of the fluorescent substance wheel implemented in parallel at the time of the projection operation | movement which concerns on the same embodiment.

  An embodiment in which the present invention is applied to a data projector apparatus of DLP (Digital Light Processing) (registered trademark) system will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a schematic functional configuration of a data projector apparatus 10 according to the present embodiment.
An input / output connector unit 11 includes, for example, a pin jack (RCA) type video input terminal, a D-sub15 type RGB input terminal, and a USB (Universal Serial Bus) connector.

  Image signals of various standards input from the input / output connector unit 11 are input to an image conversion unit 13 that is also generally referred to as a scaler via an input / output interface (I / F) 12 and a system bus SB.

  The image conversion unit 13 unifies the input image signal into an image signal of a predetermined format suitable for projection, appropriately writes it in the video RAM 14 which is a buffer memory for display, and then reads out the written image signal. The image is sent to the projection image processing unit 15.

  At this time, data such as symbols indicating various operation states for OSD (On Screen Display) is also superimposed on the image signal by the video RAM 14 as necessary, and the processed image signal is read out to the projection image processing unit 15. Sent.

  The projection image processing unit 15 multiplies a frame rate according to a predetermined format, for example, 60 [frames / second], the number of color component divisions, and the number of display gradations, in accordance with the transmitted image signal. The micromirror element 16, which is a spatial light modulation element (SLM), is driven to display by high-speed time division driving.

  The micromirror element 16 is turned on / off individually at a high speed by tilting angles of a plurality of micromirrors arranged in an array, for example, XGA (1024 horizontal pixels × vertical 768 pixels), thereby reflecting the reflected light. A light image is formed.

  On the other hand, R, G, B primary color lights are emitted cyclically from the light source unit 17 in a time-sharing manner. The primary color light from the light source unit 17 is totally reflected by the mirror 18 and applied to the micromirror element 16.

  Then, an optical image is formed by the reflected light from the micromirror element 16, and the formed optical image is projected and displayed on a screen (not shown) to be projected through the projection lens unit 19.

  The light source unit 17 includes a laser diode (LD) 21 that emits laser light in an ultraviolet region that is invisible.

The laser beam in the ultraviolet region emitted from the laser diode 21 is reflected by the dichroic mirror 22 and applied to one point on the circumference of the color wheel 23.
The color wheel 23 is rotated by a motor (M) 24.
FIG. 2 is a diagram illustrating the configuration of the color wheel 23. FIG. 2B shows an external configuration of the color wheel 23 that is mounted on the color wheel 23 and is rotationally driven as described above and forms a part of the light source unit 17. On the circumference of the color wheel 23 irradiated with the laser light, the red phosphor 23R, the green phosphor 23G, and the blue phosphor 23B are formed in a ring shape together.

  As shown in FIG. 2A, the color wheel 23 before the formation of the red phosphor 23R, the color wheel 23G, and the blue phosphor 23B has a fan-shaped marker 23MK that finely divides the circumference. Pre-formed.

  That is, in the color wheel 23, the red phosphor 23R, the green phosphor 23G, and the blue phosphor 23B are coated on the marker 23MK, so that the presence of the marker 23MK cannot be visually recognized from the appearance. Yes.

  The red phosphor 23R is formed by applying a phosphor having a characteristic of exciting red light by irradiation with ultraviolet light on the marker 23MK. Similarly, the green phosphor 23G is formed by applying a phosphor having a property of exciting green light by irradiation with ultraviolet light on the marker 23MK. Similarly, the blue phosphor 23B is formed by applying a phosphor having a property of exciting blue light by irradiation with ultraviolet light on the marker 23MK.

  In FIG. 2B, the configuration in which the central angle of the red fluorescent reflector 23R, the green fluorescent reflector 23G, and the blue fluorescent reflector 23B with respect to the center of the color wheel 23 is 120 ° is illustrated. Is.

  However, the present embodiment is not limited to this, the frequency standby of the ultraviolet light emitted from the laser diode 21 that is the light source light, the fluorescence characteristics of the red phosphor 23R, the green phosphor 23G, and the blue phosphor 23B, or this data The angle ratio on the circumference of the red phosphor 23R, the green phosphor 23G, and the red phosphor 23R can be arbitrarily set, including design matters such as the color tone of the image projected by the projector device 10. To do.

  Accordingly, by irradiating the laser light in the ultraviolet region to the color wheel 23 rotated by the motor 24 in FIG. 1, red, green, or blue light that is visible light is excited. All of the light excited by the color wheel 23 is reflected by the color wheel 23, passes through the dichroic mirror 22 and the lens 25, is reflected by the mirror 26, and has a luminance distribution approximately by the integrator 28 via the lens 27. After the light flux is uniform, it is totally reflected by the mirror 32 and sent to the mirror 18.

  A circumferential point where the red phosphor 23R, the green phosphor 23G, and the blue phosphor 23B of the color wheel 23 are formed toward a point different from the position irradiated with the laser light from the laser diode 21. Then, a CCD (Charge Coupled Device) 29 which is an individual imaging device is arranged.

  Further, the wheel marker 30 is disposed so as to face one place on the circumferential side surface of the color wheel 23. The wheel marker 30 detects the rotation period and the rotation phase of the color wheel 23 by detecting the facing of a synchronization mark (not shown) provided at one circumferential end of the color wheel 23.

  Both the image signal obtained by the imaging operation of the CCD 29 and the detection signal of the wheel marker 30 are sent to the projection light processing unit 31.

  The projection light processing unit 31 controls the light emission timing of the laser diode 21 of the light source unit 17 and the rotation of the color wheel 23 by the motor 24. The projection light processing unit 31 controls the light emission timing of the semiconductor laser unit 21 and the rotation of the color wheel 24 according to the timing of the image data given from the projection image processing unit 15.

  In addition, the projection light processing unit 31 performs analysis processing of the image signal obtained by the CCD 29 and detection processing from the wheel marker 30 as described above.

  The CPU 32 controls all the operations of the above circuits. The CPU 32 is directly connected to the main memory 33 and the program memory 34. The main memory 33 is composed of DRAM and functions as a work memory for the CPU 32. The program memory 34 is configured by an electrically rewritable nonvolatile memory, and stores an operation program executed by the CPU 32, various fixed data, and the like. The CPU 32 uses the main memory 33 and the program memory 34 to execute a control operation in the data projector device 10.

The CPU 32 executes various projection operations in response to key operation signals from the operation unit 35.
The operation unit 35 includes a key operation unit provided on the main body of the data projector device 10 and a laser light receiving unit that receives infrared light between a remote controller (not shown) dedicated to the data projector device 10. A key operation signal based on a key operated by the key operation unit or a remote controller is directly output to the CPU 32.

  The CPU 32 is further connected to the audio processing unit 36 via the system bus SB. 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 unit 37 to emit a loud sound, or generates a beep sound or the like as necessary.

Next, the operation of the above embodiment will be described.
FIG. 3 shows the contents of the phosphor wheel monitoring process that is executed by the projection light processing unit 31 mainly under the control of the CPU 32 and is always performed in parallel with the projection operation.

  The operation control by the CPU 32 and the projection light processing unit 31 is executed by reading the operation program stored in the program memory 34 and developing and holding it in the main memory 33. The operation program stored in the program memory 34 is not limited to that stored in the program memory 34 before shipment from the factory. For example, a user who owns the data projector device 10 after product sales can install an update program downloaded via a network such as the Internet via the input / output connector unit 11 and the input / output interface 12. Shall.

  Initially, it is confirmed by the output of the wheel marker 30 that the color wheel 23 is rotating (step S101). If it is confirmed, the image signal from the CCD 29 is analyzed by the projection light processing unit 31, and the marker 23MK is used instead of the red phosphor 23R, the green phosphor 23G, and the blue phosphor 23B of the color wheel 23 from the analysis image. Whether or not the marker 23MK has been detected is determined based on whether or not the image pattern has been extracted (step S102).

  Here, when the image pattern of the marker 23MK cannot be extracted and it is determined that the marker 23MK is not detected, any of the red phosphor 23R, the green phosphor 23G, and the blue phosphor 23B is selected from the color wheel 23. It is determined that the color wheel 23 is not functioning properly and the color wheel 23 is functioning normally, and the counter value c set in the main memory 33 for counting the abnormal state of the color wheel 23 is cleared. After setting “0” (step S103), the process returns to step S101 again.

  In this manner, while waiting for the marker 23MK to be detected, the processes in steps S101 to S103 are repeatedly executed.

  When the image pattern of the marker 23MK is extracted from the image obtained by the CCD 29, it is determined in step S102, and the count value c is updated and set to “+1” (step S104).

  Next, after confirming that the updated count value c is not “3”, the process returns to step S101 again.

  The processes in steps S101, S102, S104, and S105 are repeatedly executed three times. If it is determined in step S105 that the count value c is “3”, the red phosphor 23R and the green phosphor 23G from the color wheel 23 at this time. Then, it is determined that at least one portion of the blue phosphor 23B has been peeled off, and the light emission of the laser diode 21 is immediately stopped (step S106).

  Further, the projection light processing unit 31 notifies the CPU 32 that the phosphor has been peeled off (step S107).

  Receiving this, the CPU 32 stores that the notification has been received and turns off the power supply of the entire data projector apparatus 10 (step S108), and the processing of FIG.

  As described above in detail, according to the present embodiment, the red phosphor 23R, the green phosphor 23G, and the blue phosphor of the color wheel 23 that constitutes a part of the optical system or the like with a strong light source such as the laser diode 21. When 23B is peeled off from the color wheel 23, it is possible to reliably detect this, and to prevent further damage expansion and influence on the outside of the data projector device 10.

  In the above embodiment, since the shape of the marker 23MK of the color wheel 23 is extracted from the image obtained by the CCD 29 by image analysis processing to detect partial peeling of the phosphor layer, image analysis processing is performed. Although the burden on the projection light processing unit 31 is increased, it is possible to detect the breakage of the color wheel 23 more reliably.

  Unlike the above embodiment, instead of the marker 23MK, a specific color marker different from any of the red phosphor 23R, the green phosphor 23G, and the blue phosphor 23B is formed on the phosphor, By combining a photosensor such as a phototransistor or a photodiode in place of the CCD 29 with a color filter corresponding to the specific color, the output of the color wheel 23 is generated by the output of the photosensor when a part of the phosphor layer is peeled off. Damage can be detected.

  With such a configuration, it is possible to reliably detect breakage of the color wheel 23 with a simple configuration without performing image analysis processing or the like in the projection light processing unit 31.

  Further, in the above embodiment, it is assumed that the abnormality is not determined until the number of detections from the CCD 29 reaches three consecutive times.

  In this way, by suspending the determination that the abnormal state is abnormal until the abnormal state is continuously detected a predetermined number of times, it is possible to avoid frequent malfunctions of the abnormal detection and to implement a countermeasure based on the reliable detection.

  Note that the number of consecutive times until the abnormality detection is reliably determined is not limited to the numerical value “3” used in the above embodiment, but the detection target side such as the marker 23MK of the color wheel 23 and the detection such as the CCD 29. It is appropriately set according to the overall detection accuracy by combining the detection means for performing the signal processing and the signal processing such as the projection light processing unit 31 for processing the detection signal.

  In addition, although the present embodiment has been described with respect to a case where the present invention is applied to a DLP (registered trademark) type data projector apparatus, the present invention is not limited to this, and there are various types of fear that damage due to light source light or influence on the outside of the apparatus may occur. The present invention can also be applied to a projection device.

  In addition, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention in the implementation stage. Further, the functions executed in the above-described embodiments may be combined as appropriate as possible. The above-described embodiment includes various stages, and various inventions can be extracted by an appropriate combination of a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, if the effect is obtained, a configuration from which the constituent requirements are deleted can be extracted as an invention.

  DESCRIPTION OF SYMBOLS 10 ... Data projector apparatus, 11 ... Input / output connector part, 12 ... Input / output interface (I / F), 13 ... Image conversion part (scaler), 14 ... Video RAM, 15 ... Projection image processing part, 16 ... Micromirror element (SLM), 17 ... light source, 18 ... mirror, 19 ... projection lens unit, 21 ... laser diode (LD), 22 ... dichroic mirror, 23 ... color wheel, 23B ... blue phosphor, 23G ... green phosphor, 23MK ... Marker, 23R ... Red phosphor, 24 ... Motor (M), 25 ... Lens, 26 ... Mirror, 27 ... Lens, 28 ... Integrator, 29 ... CCD, 30 ... Wheel marker, 31 ... Projection light processing unit, 32 ... CPU, 33 ... main memory, 34 ... program memory, 35 ... operation unit, 36 ... audio processing unit, 37 ... speaker unit, S ... system bus.

Claims (6)

A light source that continuously generates light of the same wavelength;
A rotating wheel in which a phosphor layer is formed so as to cover a predetermined mark on at least a part of the circumference of the rotating disk irradiated with light from the light source;
An input means for inputting an image signal;
Projecting means for forming and projecting a light image corresponding to an image signal input by the input means using light provided through the rotating wheel;
Detecting means for detecting the appearance of a predetermined mark disposed opposite to the peripheral surface of the rotating wheel of the rotating wheel and coated under the phosphor layer;
And a control unit that stops generation of light from the light source according to a detection result of the detection unit. The rotating wheel is formed by coating a phosphor layer on a mark having a predetermined shape,
2. The projection apparatus according to claim 1, wherein the detecting means picks up an image of a mark having a predetermined shape on the rotating wheel using an image pickup device, and detects the appearance of the mark based on an image signal output from the image pickup device. The rotating wheel is formed by coating the phosphor layer on a mark having a color tone different from that of the phosphor layer,
2. The projection apparatus according to claim 1, wherein the detecting means picks up an image of a mark of a predetermined color tone on the rotating wheel with an image pickup device, and detects the appearance of the mark based on an image signal output from the image pickup device. 2. The projection according to claim 1, wherein the detecting means counts the number of times the predetermined mark of the rotating wheel is detected, and detects the appearance of the mark when the count value reaches a preset numerical value. apparatus. A light source that continuously generates light of the same wavelength, a rotating wheel in which a phosphor layer is formed so as to cover a predetermined mark on at least a part of the circumference of a rotating disk irradiated with light from the light source, and an image signal And a projection method including a projection unit that forms and projects a light image corresponding to an image signal input by the input unit using light provided via the rotating wheel. Because
A detection step of detecting the appearance of a predetermined mark covered under the phosphor layer by a detection unit arranged to face the rotating disk peripheral surface of the rotating wheel;
And a control step of stopping generation of light from the light source according to a detection result in the detection step. A light source that continuously generates light of the same wavelength, a rotating wheel in which a phosphor layer is formed so as to cover a predetermined mark on at least a part of the circumference of a rotating disk irradiated with light from the light source, and an image signal And a computer having a built-in projection apparatus including a projection unit that forms and projects a light image corresponding to an image signal input by the input unit using light provided via the rotating wheel. Is a program to be executed,
A detection step of detecting the appearance of a predetermined mark covered under the phosphor layer by a detection unit arranged to face the rotating disk peripheral surface of the rotating wheel;
A program for causing a computer to execute a control step of stopping generation of light from the light source according to a detection result in the detection step.

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