JP4717232B2 - Projector device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a projector device, and controls the operation of a light source means when the projector device is removed from a normally operating posture, for example, by being transported or dropped, that is, when the projector device is in an abnormal state. This is intended to ensure safety.
[0002]
[Prior art]
Conventionally, various control methods for controlling the operation of the projector device when the projector device is in an abnormal state have been proposed. For example, a temperature sensor is provided for each component in the projector device, such as an illumination lamp, a cooling device, a display device such as a liquid crystal panel, etc., and whether these members are overheated or overheated. Japanese Laid-Open Patent Application No. 09-152575 proposes a technique for suppressing overheating by monitoring supplied power and detecting an abnormality. In addition, Japanese Patent Laid-Open No. 11-129122 proposes a technique for detecting an abnormality in an illumination lamp or a power supply device and displaying the abnormality.
[0003]
[Problems to be solved by the invention]
In the conventional projector apparatus, the safety measure with respect to the danger which generate | occur | produces when a device (projector apparatus) is conveyed and moved after power activation was not taken. For this reason, for example, when the equipment is transported and moved, the projection of the illumination light from the illumination lamp is accidentally directed toward the people around it, or the equipment is dropped and the illumination lamp is ruptured and scattered, resulting in injury. Often there were human errors. In particular, due to recent downsizing and weight reduction of equipment, there are increasing opportunities to carry around easily, and due to the power-up associated with the recent increase in brightness of illumination lamps, risk factors related to the light source are promoted. Therefore, there is an urgent need for safety measures for the transportation and movement of the projector device.
[0004]
The present invention is designed so that the luminous flux emitted from the illumination lamp is accidentally directed toward the people around when the device is moved, and the people are not injured when the device is dropped. It is an object of the present invention to provide a projector apparatus that can minimize damage by appropriately setting the configuration of the control means to be incorporated.
[0005]
According to a first aspect of the present invention, there is provided a projector apparatus for projecting image information illuminated with a light beam from a light source means onto a predetermined surface by an optical system, a sensor for detecting an inclination angle of the apparatus at a constant period , and the sensor If the ratio of the plurality of tilt angles of the apparatus detected a predetermined number of times exceeds a certain ratio and the time variation of the tilt angle is not monotonically increasing, the light source means reducing the brightness of said light source means while is lit, the and the ratio to be the predetermined tilt angle or more of the plurality of inclination angle beyond the predetermined ratio, and if the inclination angle is increased monotonously includes a control means for controlling so as to maintain the brightness of the light source means,
It is characterized by having.
[0006]
According to a second aspect of the present invention, there is provided the image processing circuit according to the first aspect of the present invention, further comprising an image processing circuit that corrects a projection distortion of the image information projected onto the predetermined plane, and the control means outputs an output value related to an inclination angle from the sensor. Correction of projection distortion in which a tilt state of the projector device is determined depending on whether or not the predetermined time is within a predetermined range and the image processing circuit is operated and projected on a predetermined plane based on the determination result It is characterized by performing.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a schematic view of the essential parts of Embodiment 1 of the present invention.
[0012]
FIG. 1 shows a schematic configuration of a color liquid crystal projector 401 that projects image information based on the liquid crystal panel 120 onto a screen (on a predetermined surface) 123 by an optical system 122.
[0013]
In FIG. 1, reference numeral 111 denotes a sensor, which includes an inclination sensor that detects the posture state of the apparatus. The tilt sensor 111 includes, for example, a magnet and a Hall element that detects magnetic force, and detects the amount of change of the magnetic field in all directions according to the amount of tilt of the magnet. Reference numeral 112 denotes a control unit composed of a microcomputer. A state determination unit 112b that inputs information (posture information) from the sensor 111 to determine an abnormal posture of the device main body, and determines whether the device main body is installed. It has the determination part 112a. Reference numeral 119 denotes light source means, which has a high-intensity illumination lamp and illuminates the liquid crystal panel 120. Reference numeral 117 denotes a power source (input power source) for the illumination lamp 119. Reference numeral 118 denotes a ballast that stabilizes the luminance of the illumination lamp 119 by turning on and off the power source 117 and once boosting the power source 117 and then changing the voltage to maintain a constant power. Reference numeral 121 denotes a cooling unit, which includes, for example, a cooling fan that suppresses heat radiation of the illumination lamp 119. Reference numeral 113 denotes video signal input means for inputting a video signal and an audio signal (hereinafter referred to as “video signal or the like”) into the apparatus. Reference numeral 114 denotes a decoder that synchronously separates the video signal input from the video signal input means 113. An image processing circuit 115 includes a frame memory and performs digital processing such as distortion correction of the video signal. 120 (120a, 120b, 120c) is a liquid crystal panel for each color light, and displays a video signal after image processing corresponding to each color of R, G, B, for example. Reference numeral 116 denotes a TG (timing generator) that generates a driving signal for each liquid crystal panel 120. The optical system (projection lens) 122 synthesizes the images of the liquid crystal panels 120 a, 120 b, and 120 c using a color synthesis system or the like and projects them onto the screen 123.
[0014]
In the case of a three-plate type color liquid crystal projector, the light source means 119 has a color separation system and illuminates the liquid crystal panel 120 with each color light. The optical system (projection optical system) 122 has a color composition system including a dichroic prism, a dichroic mirror, and the like.
[0015]
Note that the projector device of the present embodiment can be similarly applied to a monochrome projector device.
[0016]
In the present embodiment, the sensor 111 detects the attitude of the projector device (device) 401, and the state determination unit 112b determines whether or not the change in the output signal from the sensor has exceeded a predetermined output value and has continued for a predetermined time. The operation of the light source means 110 is controlled based on the determination result (determination result) . For example, the illumination lamp of the light source means 110 is turned off or dimmed.
[0017]
Further, when the signal output value from the sensor 111 continues to be greater than or equal to a predetermined value (within a predetermined range) , the tilt determination unit 112a determines, and based on that, when it is detected that the main body 401 is installed, the keystone The correction means corrects the distortion of the projected image.
[0018]
Next, the operation of this embodiment will be described with reference to the flowchart of FIG.
[0019]
When the power source 117 of the device is switched on, following the activation of the cooling fan 121, the illumination lamp of the light source means 119 is turned on, and if a video signal is input from the video signal input means 113, an image displayed on the liquid crystal panel 120 Is projected onto the screen 123 by the optical system 122. If no video signal is input, an initial setting screen prepared in advance is displayed on the liquid crystal panel 120 and projected onto the screen 123. (S201 → S202 → S203 → S204 → S205 → S206)
Next, a tilt information signal from a sensor (tilt sensor) 111 for detecting the attitude of the device is read by the control means 112. If the tilt information signal is a reference value corresponding to zero tilt, the state determination unit 112b indicates that the device is tilted. It is determined that there is no image, and the image projection so far is continued (S207 → S208 → S203). If the tilt information signal is obtained, the number of readings of the sensor 111 is further increased and compared with the previous reading value to determine whether or not it is stable. (S207 → S208 → S209 → S207)
The reading period of the inclination information signal here is read in the vertical synchronization (V synchronization) of the video signal. For example, if the signal value is the same for ten consecutive times, it can be determined that the inclination signal is stable. If the tilt determination unit 112a determines that the device is stably tilted at a substantially predetermined tilt, the device has been tilted and the projected image projected on the screen 123 has a trapezoidal distortion (projection distortion). The image processing circuit 115 corrects the keystone correction according to the determination and the tilt amount. (S209 → S210 → S216)
4A and 4B show how the projection screen projected onto the screen 123 causes a trapezoidal distortion due to the inclination of the device. 4A shows the trapezoidal distortion of the projected image 403 when the projector (device) 401 projects onto the screen located above, and FIG. 4B projects the projector 402 onto the screen located below. The trapezoidal distortion of the projected image 404 is shown.
[0020]
On the other hand, if the state determination unit 112b determines that the inclination signal of the device is not stable, the inclination information signal is read again after setting the reading period of the inclination information signal longer or changing the number of readings. For example, reading 200 times in vertical synchronization (V synchronization) (6.6 seconds for NTSC, 8 seconds for PAL), there is a change in signal compared to the previous read value, and the signal level is a predetermined value or more, For example, only a large inclination signal having an inclination angle of 10 ° or more is counted, and a posture determination is made as to whether or not the device is dangerously carried from the count number and the manner in which the inclination signal changes with time. (S210 → S211 → S212 → S213 → S214 → S215 → S217)
That is, when the count number is 70% or less of the number of readings, that is, 140 counts or less, it is determined that the read data is not reliable or the device is not carried around dangerously, and reading of the tilt information signal is continued. Continue to monitor the posture status of the equipment. (S214 → S215 → S207) At this time, if the tilt information signal has changed to a stable tilt value, it is determined that the device has been installed in a tilted manner, and the keystone correction of the trapezoidal distortion according to the tilt amount described above is performed by image processing. Correction is performed by the circuit 115. (S214 → S215 → S207 → S214 → S208 → S209 → S210 → S216)
FIG. 3A shows the attitude of the device 401 in this case and the locus of the output from the sensor 111 during tilt adjustment.
[0021]
On the other hand, if the count value is 70% or more of the number of readings, that is, 140 counts or more, the routine proceeds to the posture determination routine, and if the time series change of the tilt information signal is substantially unity, the tilt adjustment is continued. The determination returns to the first input condition of the sensor 111 and waits for tilt adjustment to end. (S214 → S215 → S217)
If the time series change of the tilt information signal is not substantially unity in the posture determination routine, it is determined that the device is being carried around dangerously, the ballast 118 of the illumination lamp 119 is controlled, and the illumination lamp 119 is determined. Turn off the light. (S217.fwdarw.S218.fwdarw.S219) FIG. 3B shows the locus of the output from the sensor 111 when determining the posture state of the device 401 so far.
[0022]
Thus, by automatically turning off the light source means 119 during transportation of the device in the lit state, the danger of surrounding people is avoided.
[0023]
FIG. 5 is a schematic view of the essential parts of Embodiment 2 of the present invention.
[0024]
Compared with the first embodiment of FIG. 1, the present embodiment adjusts the brightness of the lamp 119 on the basis of the signal from the dimming control unit 202c, the control means 202 having the dimming control unit 202c, and externally. The difference is that the light control means 201 for controlling the light beam emitted from the light source is provided.
[0025]
Although the configuration of the present embodiment partially overlaps with the description of the first embodiment in FIG.
[0026]
Reference numeral 111 denotes a sensor that detects the posture state of the apparatus. The sensor 111 includes, for example, a Hall element that detects a magnet and a magnetic force, and detects a change amount of the magnetic field in all directions according to a tilt amount of the magnet. Reference numeral 202 denotes a control unit composed of a microcomputer. A state determination unit 112b that inputs information from the sensor 111 to determine an abnormal posture of the apparatus body, and a dimmer 201 based on the determination of the state determination unit 112b. It has a light control unit 202c that controls and adjusts the luminance of the lamp 119, and a tilt determination unit 112a that determines that the device body is installed. Reference numeral 119 denotes light source means having a high-intensity illumination lamp. 117 is a power source of the illumination lamp 119. Reference numeral 118 denotes a ballast that stabilizes the luminance of the illumination lamp 119 by turning on and off the power source 117 and once boosting the input power source 117 and then changing the voltage to maintain a constant power. 121 is a cooling means, for example, a cooling fan that suppresses heat radiation of the illumination lamp 119. Reference numeral 201 denotes a dimmer, which repeatedly drives light shielding / transmission at a specific frequency and duty ratio to vary the brightness of the illumination lamp 119. Reference numeral 113 denotes a video signal input means for inputting a video signal and an audio signal into the device. Reference numeral 114 denotes a decoder that synchronously separates the video signal input from the video signal input means 113. An image processing circuit 115 includes a frame memory and performs digital processing such as distortion correction of the video signal. Reference numeral 120 (120a, 120b, 120c) denotes a liquid crystal panel, which displays a video signal after image processing corresponding to each color of R, G, and B. Reference numeral 116 denotes a TG (timing generator) that generates a driving signal for each liquid crystal panel, and the optical system 122 synthesizes the images of the liquid crystal panels 120 a, 120 b, and 120 c by a color composition system and projects them onto the screen 123.
[0027]
The operation of this embodiment will be described with reference to the flowchart of FIG.
[0028]
When the power supply 117 of the device is switched on, following the activation of the cooling fan 121, the illumination lamp of the light source means 119 is turned on, and the image displayed on the liquid crystal panel 120 if the video signal input means 113 video signal is input. If an image signal is not input, the initial setting screen prepared in advance is displayed on the liquid crystal panel 120 and projected onto the screen 123. (S201 → S202 → S203 → S204 → S205 → S206)
Next, the control means 202 reads the inclination information signal from the sensor 111 that detects the posture of the device, and the state determination unit 112b indicates that the device is not inclined if the signal is a reference value corresponding to zero inclination amount (inclination angle). Judgment is made and image projection so far is continued (S207 → S208 → S203). If the tilt information signal is obtained, the number of readings of the sensor 111 is further increased and compared with the previous reading value to determine whether or not it is stable. (S207 → S208 → S209 → S207)
The reading period of the inclination information signal here is read in the vertical synchronization (V synchronization) of the video signal, and for example, if the signal value is 10 times continuously, it can be determined that the inclination signal is stable. If the tilt determination unit 112a determines that the device is stably tilted at a substantially predetermined tilt, the tilt is determined by determining that the device has been tilted and the projected image projected on the screen 123 has a trapezoidal distortion. The keystone correction corresponding to the amount is corrected by the image processing circuit 115. (S209 → S210 → S216)
On the other hand, if it is determined that the inclination information signal is not stable, the number of readings is changed and the inclination information signal is read again. For example, reading is performed a predetermined number of times in vertical synchronization (V synchronization) , for example, 200 times (with a fixed period of 6.6 seconds for NTSC and 8 seconds for PAL), and there is a signal change compared to the previous reading value, In addition, only a large tilt information signal with a signal level of a predetermined value or more (predetermined tilt angle or more) , for example, a tilt angle of 10 ° or more, is counted, and the equipment is dangerously carried due to the way the count number and the tilt information signal change over time. It is determined whether or not it has been done. (S210 → S211 → S212 → S213 → S214 → S215 → S217)
That is, when the count number is 70% or less of the number of readings, that is, 140 counts or less, it is determined that the read data is not reliable or the device is not carried around dangerously, and reading of the tilt information signal is continued. Continue to monitor the posture status of the equipment. (S214 → S215 → S207) At this time, if the tilt information signal has changed to a stable tilt value, it is determined that the device has been installed in a tilted manner, and the keystone correction of the trapezoidal distortion according to the tilt amount described above is performed by image processing. Correction is performed by the circuit 115. (S214 → S215 → S207 → S214 → S208 → S209 → S210 → S216)
On the other hand, if the count value is 70% or more (fixed rate) of the number of readings, that is, 140 counts or more, the routine proceeds to the posture determination routine. If the time series change of the tilt information signal is monotonically increasing, the tilt adjustment is continued. It returns to the input condition of the first sensor 111 and waits for tilt adjustment to end. That is, the brightness of the light source means is maintained. (S214 → S215 → S217)
If the time signal change of the tilt signal is not monotonically increasing in the posture determination routine, it is determined that the device is being carried around dangerously, and the dimming control unit 202c reduces the luminance of the light source means 119 by the dimmer 201. To control. (S217 → S218 → S219)
Accordingly, if the device control means 202 determines that the device is dangerous when the device is transported or moved with the light source means 119 turned on, the brightness of the illumination lamp 119 is automatically lowered, thereby giving a warning to the device user and Avoid the dangers of people. The control unit controls one or more operations of the light source unit, the image processing circuit, and the dimming unit based on the determination result based on the signal from the sensor.
[0029]
In the above-described embodiment, the tilt sensor is used as a sensor for detecting the posture state of the device. However, the same device control can be performed using an acceleration sensor that can detect vibration and shaking.
[0030]
【The invention's effect】
According to the present invention, as described above, when the device is moved, the light flux radiated from the illumination lamp is accidentally directed toward the people around it, or when the device itself is dropped, people may be injured. Thus, by appropriately setting the configuration of the control means incorporated in the device, it is possible to achieve a projector device that can minimize damage.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a first embodiment of the present invention. FIG. 2 is a flowchart showing a first embodiment of the present invention. FIG. FIG. 4 is an explanatory diagram showing how a projection screen causes trapezoidal distortion in the present invention. FIG. 5 is a block diagram showing a second embodiment of the present invention. Flowchart showing Embodiment 2 [Explanation of Symbols]
PL projector device 111 sensor 112 control means 112a tilt determination section 112b state determination section 113 video signal input means 114 decoder 115 image processing circuit 116 TG
117 power supply 118 ballast 119 light source means 120 liquid crystal panel 121 cooling means 122 projection optical system 123 screen 202 control means 202c dimming control unit 201 dimming means

Claims (2)

In a projector device that projects image information illuminated with a light beam from a light source means onto a predetermined surface by an optical system,
A sensor for detecting the tilt angle of the device at a constant period ;
When the ratio of a plurality of tilt angles of the device detected by the sensor a predetermined number of times exceeds a predetermined ratio and the time series change of the tilt angle is not monotonically increasing, Reducing the brightness of the light source means with the light source means turned on,
Wherein and the ratio to be the predetermined tilt angle or more of the plurality of inclination angle exceeds the predetermined ratio, and if the inclination angle is increased monotonically is controlled to maintain the intensity of the light source means Control means;
A projector apparatus comprising: An image processing circuit for correcting a projection distortion of the image information projected on the predetermined surface, and the control means determines whether or not an output value related to an inclination angle from the sensor is within a predetermined range for a predetermined time or more. The projector apparatus according to claim 1, wherein a tilt state of the projector apparatus is determined, and based on the determination result, the image processing circuit is operated to correct a projection distortion projected onto a predetermined surface. .

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