JP5098658B2 - Projection apparatus, projection control method, and program - Google Patents

Description

  The present invention relates to a projection apparatus suitable for a projector apparatus that uses a micromirror element as a display element, a projection control imaging method, and a program.

  Conventionally, a micromirror element, which is one of MEMS (Micro Electro Mechanical Systems: micromachine) technology, is used as a display element to form an optical image with reflected light from a light source, and perform DLP (Digital) Many projectors of the Light Processing (registered trademark) system have been commercialized.

  Since this type of projector can form a light image using light from the light source more efficiently than a projector using a transmissive liquid crystal panel as a display element, a brighter image can be projected.

  In addition, the primary color light is irradiated onto the display element in a time-sharing manner through a color wheel that rotates at high speed between the light source and the display element, and a light image corresponding to each primary color light is formed in a time-sharing manner, whereby the display element itself Can project a color image on a single plate, thus enabling high-resolution image projection.

As described above, the DLP (registered trademark) projectors can be projected with a relatively high resolution as described above, and therefore, many projectors have an automatic trapezoidal correction function that tends to deteriorate the image quality. Many have been proposed. (For example, Patent Document 1)
JP-A-2005-070415

  When a momentary power failure occurs due to inadvertently pulling out the AC power cable in the projector, the cooling fan for cooling the inside is also stopped at the same time. Therefore, high heat generated by the light source lamp, which is a heat source, is accumulated inside the projector, and various devices that are vulnerable to thermal stress, such as the light source lamp itself, may be damaged such as deterioration.

  In order to avoid such a situation, a rechargeable spare battery is prepared in advance, and a technology to drive the cooling fan by supplying power instead of the AC power supply at the time of power failure or after cooling after the projection operation is put into practical use. ing.

  However, the micromirror element as the display element is also one of devices that are adversely affected by thermal stress. Specifically, when the display element system fails in a state where some image is projected, an on position where the micromirrors that form individual pixels in the micromirror device are in an inclined direction that reflects incident light toward the projection lens, Or it will be exposed to heat stress in the state fixed in either the off position used as the inclination direction reflected on the light absorber outside a projection lens.

  Therefore, under the influence of thermal stress, deterioration due to different thermal stress between the micromirror of the pixel at the on position and the micromirror at the off position, for example, a change in tilt angle or a decrease in response speed occurs. As a result, the image displayed by the micromirror element is deteriorated in an irregular pattern as a whole, and there is a problem that the image quality is remarkably lowered even in the subsequent normal image display.

  To cope with this, it is conceivable to drive a cooling fan that blows air to the micromirror element by the power supplied from the spare battery, as in the cooling of the light source lamp. The amount of power required is increased, the spare battery must have a larger capacity, and this hinders the reduction in size and weight of the entire projector device and the simplification of the configuration.

  The present invention has been made in view of the above circumstances, and its purpose is to suppress the adverse effects caused by thermal stress of the mirror element during an instantaneous power failure, etc., and to avoid the deterioration of the projected image quality due to the deterioration of the element. It is an object of the present invention to provide a projection apparatus, a projection control method, and a program that can be used.

The invention according to claim 1 is a projection device, wherein a mirror that forms an optical image by reflected light by controlling each tilt angle of the light source and a plurality of micromirrors arranged in an array with respect to the light from the light source. Projecting means for driving an element and projecting a light image corresponding to an input image signal, a main power source for supplying a power to at least the light source and the projecting means to perform a projection operation, and a standby power source for storing the power a determining means for determining the power of the stop from the main power supply to said projection means, and a temperature detecting means for detecting the temperature of the mirror element, detected at decision content and the temperature detecting means in the determination means On the basis of the result, there is provided control means for driving and controlling all the micromirrors constituting the mirror element at a predetermined inclination angle using the power of the standby power source.

According to a second aspect of the present invention, in the first aspect of the invention, the control means determines that the power from the main power supply has stopped, and the temperature detection means determines that the temperature of the mirror element is predetermined. When it is determined that the temperature is equal to or higher than the temperature, all the micromirrors constituting the mirror element are driven and controlled to a predetermined inclination angle using the power of the standby power supply.
According to a third aspect of the present invention, in the first or second aspect of the invention, the control means determines that the power from the main power supply has been stopped by the determining means, and the temperature detecting means determines the temperature of the mirror element. Is determined to be lower than a predetermined temperature, all the micromirrors constituting the mirror element are not driven and controlled to a predetermined inclination angle using the power of the standby power supply.

According to a fourth aspect of the present invention, in the first to third aspects of the present invention, the apparatus further includes a cooling fan that blows and cools the light source and the mirror element, and the control means is driven at a predetermined inclination angle. The controlled mirror element is cooled by blowing air from the cooling fan with the power of the standby power supply.
The invention described in claim 5 is the invention described in claim 4, characterized in that the control means cools both the light source and the mirror element by the cooling fan with the power of the standby power supply.

According to a sixth aspect of the present invention, in the invention according to any one of the first to fifth aspects, the standby power supply stores a part of electric power supplied from the main power supply.

According to a seventh aspect, the invention according to any of the claims 1 to 6, the above-mentioned predetermined tilt angle, all micro mirrors constituting the mirror element at an angle becomes flat along the array arrangement direction characterized in that there.

According to the eighth aspect of the invention, a light source and a mirror element that forms an optical image by reflected light by controlling each inclination angle with respect to light from the light source of a plurality of micromirrors arranged in an array are inputted and input. Projection control with a projection unit that projects a light image corresponding to an image signal, a main power source that supplies power to at least the light source and the projection unit to perform a projection operation, and a standby power source that stores the power A determination step for determining stoppage of power from a main power source supplied to the projection unit; a temperature detection step for detecting a temperature of the mirror element; a determination content in the determination step; and the temperature detection. And a control step of driving and controlling all the micromirrors constituting the mirror element at a predetermined tilt angle using the power of the standby power source based on the detection result in the step .

According to a ninth aspect of the present invention, a light source and a mirror element that forms an optical image by reflected light by controlling each inclination angle of a plurality of micromirrors arranged in an array shape with respect to the light from the light source is inputted. Built-in projection device that projects a light image corresponding to the image signal to be output, a main power source that supplies power to at least the light source and the projection unit to perform a projection operation, and a standby power source that stores the power A program executed by a computer that determines whether to stop power from the main power source supplied to the projection unit, a temperature detection step that detects the temperature of the mirror element, and a determination in the determination step based on the detection result of the contents and the temperature detecting step, drives and controls the whole micro mirrors constituting the mirror element at a predetermined tilt angle with the electric power of the auxiliary power supply control scan Characterized in that to execute a-up the computer.

  According to the present invention, it is possible to suppress an adverse effect due to thermal stress of a mirror element, such as during an instantaneous power failure, with less standby power consumption, and to avoid a reduction in projection image quality due to element deterioration.

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

FIG. 1 is a block diagram showing a functional configuration of an electronic circuit included in the data projector device 10 according to the embodiment.
In the figure, reference numeral 11 denotes an input / output connector section 11 provided on the back side of the main body, which comprises, for example, a pin jack (RCA) type video input terminal, an RGB input terminal of a D-sub 15, and a USB terminal.

  Image signals of various standards input from the input / output connector unit 11 are processed by an image conversion unit 13, which is generally called a scaler, via an input / output interface (I / F) 12 and a system bus SB. After being unified into an image signal of a predetermined format including the like, it is sent to the projection image processing unit 14.

  At this time, a character image for OSD (On Screen Display) and a symbol such as a pointer are also sent to the projection image processing unit 14 while being superimposed on the image signal as necessary.

  The projection image processing unit 14 develops and stores the transmitted image signal in the video RAM 15, and then generates a video signal from the stored contents of the video RAM 15.

  The projection image processing unit 14 performs spatial light modulation element by faster time-division driving that multiplies the frame rate of the video signal, for example, 60 [frames / second], the number of color component divisions, and the number of display gradations. The micromirror element 16 which is (SOM) is driven to display.

  The micromirror element 16 is provided with a temperature sensor 17, and the temperature detected by the temperature sensor 17 is sent to the control unit 32 described later via the projection image processing unit 14.

  On the other hand, a light source lamp 19 disposed in the reflector 18 using, for example, a high pressure mercury lamp emits white light with high luminance. The white light emitted from the light source lamp 19 is colored into a primary color in a time-sharing manner through the color wheel 20, is converted into a luminous flux having a uniform luminance distribution by the integrator 21, is totally reflected by the mirror 22, and is reflected on the micromirror element 16. Irradiated.

  Thus, an optical image is formed by the reflected light from the micromirror element 16, and the formed optical image is projected and displayed on the screen (not shown) to be projected through the projection lens unit 23.

  The projection lens unit 23 enlarges the optical image formed by the micromirror element 16 and projects it onto a target such as a screen, and the focus position and zoom position (projection angle of view) can be arbitrarily changed. To do.

  That is, among a plurality of optical lenses constituting the projection lens unit 23, a focus lens and a zoom lens (not shown) are controlled by moving back and forth along the optical axis direction, and these lenses are stepping motors (M). It moves by 24 rotational drive.

  A cooling fan 25 for mainly cooling the light source lamp 19 is rotationally driven by a motor (M) 26. Further, a cooling fan 27 for mainly cooling the micromirror element 16 is rotationally driven by a motor (M) 28. In addition, a motor (M) 29 for rotating the color wheel 20 is provided.

  The light source lamp 19 is turned on, the color wheel 20 motor 29 is rotated, the cooling fan 25 motor 26 is rotated, the cooling fan 27 motor 28 is rotated, and the stepping motor 24 is driven. The projection light processing unit 30 executes both rotation driving.

  In addition, the projection light processing unit 30 receives temperature data from a temperature sensor 31 that is attached to the reflector 18 and detects the temperature of the light source lamp 19.

  The CPU 32 controls all the operations of the above circuits. The CPU 32 uses a main memory 33 constituted by SDRAM (synchronous DRAM) and a program memory 34 which is an electrically rewritable nonvolatile memory storing operation programs, various fixed data, and the like in the data projector apparatus 10. The control operation is executed.

  The CPU 32 executes various projection operations in accordance with 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 an Ir receiving unit that receives infrared light from a remote controller (not shown) dedicated to the data projector device 10. A key code signal based on the key operated via the remote controller is directly output to the CPU 32.

  The CPU 32 is further connected to an indicator unit 36, an audio processing unit 37, and a power supply controller 38 via the system bus SB.

  The indicator unit 36 is composed of, for example, a plurality of LEDs, and displays the operation state of the apparatus, for example, power on / off, temperature abnormality of the light source lamp 19 and the like, by a light emission color and a lighting / flashing pattern.

  The sound processing unit 37 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 39 to emit a loud sound, and generates a beep sound or the like if necessary.

  The power controller 38 connects the AC input unit 40 and the spare battery 41. The AC input unit 40 rectifies and transforms an AC voltage applied from the outside of the apparatus into a predetermined voltage, for example, a DC voltage of 6 [V], and outputs the converted voltage to the power supply controller 38.

  The power supply controller 38 transforms and supplies the DC voltage from the AC input unit 40 to a plurality of DC voltages suitable for the operation of each circuit, while charging the spare battery 41 in preparation for an unexpected situation such as an instantaneous power failure. Keep it. The spare battery 41 includes, for example, a large-capacity capacitor, a lithium ion secondary battery, and a driver circuit thereof.

Next, the operation of the above embodiment will be described.
FIG. 2 shows an integrated operation from immediately after the power switch is turned on to the normal projection operation until the power switch is turned off. The CPU 32 stores all the operation control in the program memory 34. The read operation program is read and executed in the main memory 33.

  At the beginning of processing, first, the projection light processing unit 30 starts rotation of the motors 26 and 28 that drive the cooling fans 25 and 27 (step S101). In addition, the lighting of the light source lamp 19 is started (step S102).

  Thereafter, it is determined whether or not the temperature “Tlamp” of the light source lamp 19 detected by the temperature sensor 31 is equal to or higher than a first threshold “Tthr1” indicating a lower limit temperature suitable for projection (step S103). For example, by repeatedly executing this determination, it waits for the light source lamp 19 to rise to a temperature suitable for projection.

  If it is determined in step S103 that the temperature “Tlamp” of the light source lamp 19 has become equal to or higher than the first threshold value “Tthr1”, an image input from the input / output connector unit 11 to perform a normal projection operation thereafter. A light image of the signal is displayed on the micromirror element 16, and projection processing for emitting the projection light from the projection lens unit 23 is performed (step S104).

  While performing this projection processing, whether or not the power supply from the AC input unit 40 is stopped for some reason via the power controller 38 (step S105), and the power off operation is instructed by the power key operation of the operation unit 35. By repeatedly determining whether or not it has been performed (step S106), it waits to enter these states.

  FIG. 3 illustrates an on / off operation of one of many micromirrors MM constituting the micromirror element 16 as an example during the normal projection operation. Although not shown here, a member serving as a microactuator for driving the micromirror MM placed on the substrate B is disposed for each micromirror MM on the lower surface side of the micromirror MM.

  FIG. 3A shows a state where the pixel is turned on and the light from the mirror 22 is reflected toward the projection lens unit 23. It is assumed that the inclination angle of the micro mirror MM at this time is “+ θ” with respect to the array arrangement plane F as shown in the drawing.

  On the other hand, in FIG. 3B, the pixel is turned off, and the light from the mirror 22 is reflected in a position away from the projection lens unit 23, specifically in a direction in which a light absorption pad (not shown) is arranged. Indicates the state of It is assumed that the inclination angle of the micro mirror MM at this time is “−θ” with respect to the array arrangement plane F as shown in the figure.

  FIG. 4A shows a part of a plurality of micromirrors MM constituting the micromirror element 16. During a normal projection operation, the micro mirror MM is individually set to the on state or the off state for each pixel as illustrated.

  If it is determined in step S106 that a power-off instruction has been given by operating the power key during a normal projection operation, after executing a predetermined power-off process (step S107), all of the data projector device 10 are configured. 2 is stopped (step S108), and the processing of FIG. 2 is completed.

  As the predetermined power-off process, for example, the light source lamp 19 is turned off, the air is blown and projected by the cooling fans 25 and 27 until the temperature of the light source lamp 19 detected by the temperature sensor 31 becomes less than the first threshold “Tthr1”. Including shortening of the lens unit 23.

  If it is determined in step S105 that the power supply from the AC input unit 40 has stopped for some reason, only the control system including the CPU 32 is immediately switched to the power supply from the spare battery 41 (step S109).

  At this time, lighting of the light source lamp 19 by the projection light processing unit 30, rotation of the color wheel 20, rotation of the cooling fans 25 and 27, etc. are all stopped, and image display operation on the micromirror element 16 is also stopped. The

  In this state, the CPU 32 detects the temperature of the micromirror element 16 by the temperature sensor 17 via the projection image processing unit 14, and the detected temperature “Tmmd” of the micromirror element 16 is equal to or higher than the second threshold value “Tthr2”. Whether or not (step S110).

  Here, the second threshold value “Tthr2” is set in advance as a lower limit temperature value at which each micromirror MM constituting the micromirror element 16 may be deteriorated due to thermal stress. To do.

  However, only when it is determined in step S110 that the temperature “Tmmd” of the micromirror element 16 is equal to or higher than the second threshold value “Tthr2”, the individual powers supplied from the spare battery 41 constitute the individual micromirror elements 16. A parking process is executed in which all the micromirrors MM are collectively driven and controlled at an inclination angle that is flat along the array arrangement direction (step S111).

  FIG. 4B illustrates a partial state of the micromirror element 16 in which all the micromirrors MM are flattened by the parking process. In this way, all the micromirrors MM are flattened on the same surface, and the gap between adjacent micromirrors MM is kept to a minimum.

  Therefore, even when the cooling fans 25 and 27 stop rotating and the cooling air is interrupted in a heat stress environment, the heat is passed on the micromirror MM, so that the micromirror MM and the micromirror element substrate B are separated. It is possible to suppress deterioration and breakage of the micromirror element 16 due to thermal stress without the heat being trapped.

  Regardless of the presence or absence of the processing in step S111, energization to all the circuits and elements constituting the data projector device 10 is thereafter stopped (step S108), and the processing in FIG.

  As described above, according to the present embodiment, even when a mechanism such as a fan that cools down due to an instantaneous power failure or the like is stopped, the adverse effect due to the thermal stress generated in the micromirror element 16 is suppressed, and the projected image quality is lowered due to the deterioration of the element. Can be avoided.

  In addition, in the above-described embodiment, the temperature sensor 17 for detecting the temperature of the micromirror element 16 is provided, and all the micromirrors of the micromirror element 16 are provided only when the temperature of the micromirror element 16 may be affected by thermal stress. The MM was flattened.

  As a result, the power actually used to control the micromirror element 16 is very small, but the limited power of the spare battery 41 is made effective by controlling the micromirror element 16 only when necessary. For example, the power remaining in the spare battery 41 can be used for cooling the light source lamp 19, for example.

  Therefore, although not described in the above embodiment, after performing the flattening process of all the micromirrors MM of the micromirror element 16, the motors 26 and 28 are driven using the power remaining in the spare battery 41, and the cooling fan It is good also as what cools both the light source lamp 19 and the micromirror element 16 by the ventilation by 25,27.

  By doing so, it is possible to further reduce the deterioration and breakage of the light source lamp 19 and the micromirror element 16 which are the main structures of the data projector apparatus 10 and have a great influence on the projected image quality.

  In the above-described embodiment, the case where the present invention is applied to a DLP (registered trademark) type data projector apparatus using one micromirror element 16 has been described. However, a light image of three primary colors using three micromirror elements. It is also possible to apply the same to a three-chip type apparatus that emits light after combining the formed light images of each color with a prism.

  In the above embodiment, the spare battery 41 is not limited to a capacitor or a secondary battery charged by the power controller 38, and may be a primary battery such as a dry battery. Further, the parking process state is not limited to the case where all the micromirrors MM are collectively brought into an inclination angle that is flat along the array arrangement direction as shown in FIG. The state in which the pixel in 3 (A) is turned on, the state in which the pixel in FIG. 3 (B) is turned off, or a state with a predetermined inclination angle other than that is heated. On the other hand, if the micromirror element has a structure that can reduce deterioration and breakage, the parking process may be performed in that state.

  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. In addition, the functions executed in the above-described embodiments may be implemented in appropriate combination as much as possible. The above-described embodiment includes various stages, and various inventions can be extracted by an appropriate combination according to a plurality of disclosed structural requirements. For example, even if several constituent requirements are deleted from all the constituent requirements shown in the embodiment, if an effect is obtained, a configuration from which the constituent requirements are deleted can be extracted as an invention.

1 is a block diagram showing a circuit configuration of a data projector device according to an embodiment of the present invention. The flowchart which shows the processing content after the power activation which concerns on the embodiment. The figure which illustrates the on / off drive state of each micromirror which comprises the micromirror element which concerns on the embodiment. The figure which shows the planarization process of the micromirror which comprises the micromirror element which concerns on the embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Data projector apparatus, 11 ... Input / output connector part, 12 ... Input / output interface (I / F), 13 ... Image conversion part, 14 ... Projection image processing part, 15 ... Video RAM, 16 ... Micromirror element (SOM) , 17 ... Temperature sensor, 18 ... Reflector, 19 ... Light source lamp, 20 ... Color wheel, 21 ... Integrator, 22 ... Mirror, 23 ... Projection lens unit, 24 ... Stepping motor (M), 25 ... Cooling fan, 26 ... Motor (M), 27 ... cooling fan, 28, 29 ... motor (M), 30 ... projection light processing unit, 31 ... temperature sensor, 32 ... CPU, 33 ... main memory, 34 ... program memory, 35 ... operation unit, 36 ... Indicator section, 37 ... Audio processing section, 38 ... Power supply controller, 39 ... Speaker section, 40 ... AC input section, 41 ... Spare battery , B ... mirror element substrate, MM ... micromirrors, SB ... system bus.

Claims (9)

A light source;
The mirror elements that form the optical image by the reflected light are controlled by controlling the tilt angles of the light from the light source of the micromirrors arranged in an array, and the optical image corresponding to the input image signal is projected. Projecting means,
A main power source that supplies power to at least the light source and the projection unit to perform a projection operation;
A standby power supply that stores power,
Determination means for determining stoppage of power from the main power source supplied to the projection means;
Temperature detecting means for detecting the temperature of the mirror element;
Control means for driving and controlling all the micromirrors constituting the mirror element to a predetermined inclination angle using the power of the standby power source based on the determination content of the determination means and the detection result of the temperature detection means. A projection apparatus comprising the projection apparatus. The control means determines that the power from the main power supply has stopped, and uses the power of the standby power supply when the temperature detection means determines that the temperature of the mirror element is equal to or higher than a predetermined temperature. The projection apparatus according to claim 1, wherein all the micromirrors constituting the mirror element are driven and controlled to a predetermined inclination angle. The control means determines that the power from the main power supply is stopped by the determination means, and uses the power of the standby power supply when the temperature detection means determines that the temperature of the mirror element is lower than a predetermined temperature. The projection apparatus according to claim 1, wherein all the minute mirrors constituting the mirror element are not controlled to be driven at a predetermined inclination angle. Further comprising a cooling fan for cooling by blowing air to the light source and the mirror element,
4. The projection apparatus according to claim 1, wherein the control unit cools the mirror element driven and controlled at a predetermined tilt angle by blowing air from the cooling fan with the power of the standby power supply. 5. 5. The projection apparatus according to claim 4, wherein the control means cools both the light source and the mirror element by the cooling fan with the power of the standby power supply. The standby power supply to a projection device according to any one of claims 1 to 5, wherein the storing portion of the power supply of the main power supply. The predetermined inclination angle and the projection device according to any one of claims 1 to 6, characterized in that all micro mirrors constituting the mirror element is an angle to be flat along the array arrangement direction. A light image corresponding to an input image signal by driving a mirror element that forms an optical image by reflected light by controlling each inclination angle with respect to light from the light source of a plurality of micromirrors arranged in a light source and an array. A projection control method in a projection apparatus including a projection unit that projects power, a main power source that supplies power to at least the light source and the projection unit to perform a projection operation, and a standby power source that stores power,
A determination step of determining stoppage of power from the main power source supplied to the projection unit;
A temperature detecting step for detecting the temperature of the mirror element;
A control step of driving and controlling all the micromirrors constituting the mirror element to a predetermined inclination angle using the power of the standby power source based on the determination content in the determination step and the detection result in the temperature detection step ; A projection control method characterized by comprising: Light corresponding to an input image signal by driving a mirror element that forms an optical image by reflected light by controlling each inclination angle of the light source and a plurality of micromirrors arranged in an array with respect to the light from the light source A program executed by a computer built in a projection unit that projects an image, a main power source that supplies power to at least the light source and the projection unit to execute a projection operation, and a standby power source that stores power. And
A determination step of determining stoppage of power from the main power source supplied to the projection unit;
A temperature detecting step for detecting the temperature of the mirror element;
A control step for driving and controlling all the micromirrors constituting the mirror element to a predetermined tilt angle using the power of the standby power source based on the determination content in the determination step and the detection result in the temperature detection step. A program characterized by being executed by a computer.

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