JP5541058B2 - Projector and projection control method - Google Patents

Description

  The present invention relates to a projector and a projection control method.

  Conventionally, a projector is a predetermined image (hereinafter, referred to as “input image”) that is different from a source image (hereinafter also referred to as “input image”) that a user intends to project for a certain period of time from the start-up until the light source such as a mercury lamp is stabilized. (Also referred to as “standby image” or “mask pattern image”) is projected onto the screen (see, for example, Patent Document 1). As the standby image, an image that is difficult for the user to recognize that the light source is not stable when displayed on the screen when the light source is not stable is used. As a result, even if a light source such as a mercury lamp that takes time for the spectrum to stabilize after startup is used, the user may find that the light source is not stable on the screen for a while until the spectrum is stabilized. Since a standby image that is difficult to recognize is displayed, there is an effect that the user is not aware that the light source is not stable.

JP 2009-145844 A

  However, in a mode in which a standby image is displayed for a certain period of time after activation, even when the spectrum of the light source is stabilized immediately, the activation image is displayed until the certain period of time elapses, and the input image is immediately displayed. There is a problem that is not displayed.

  The present invention has been made in view of such circumstances, and a projector and a projection that reduce the time until an input image is projected while preventing the user from being aware that the light source is not stable at the time of startup. An object is to provide a control method.

In order to solve the above problem, a projector according to one embodiment of the present invention includes a light source unit, an image projection unit that projects an image using light source light from the light source unit, and a measurement result that represents a state of the light source unit. And a projection image control unit that controls the image projection unit, and the projection image control unit projects an input image to the image projection unit after power is supplied to the light source unit. A standby image projection time that is a time for projecting a predetermined standby image different from the input image is controlled based on a measurement result by the light source state measurement unit.
According to the above configuration, it is possible to reduce the time until the input image is projected while preventing the user from being aware that the light source is not stable at the time of activation. That is, at a certain point in time of startup, the state of the light source unit, that is, the degree of stability / instability of the spectrum is grasped as a measurement result by the light source state measurement unit, and the standby image projection time is automatically adjusted according to the measurement result. Because. In other words, when a measurement result indicating a state that takes time to stabilize the spectrum is obtained, a longer standby image projection time is set so that the user is not aware that the light source is not stable. When a measurement result representing a state that does not require much time until the spectrum is stabilized is obtained, a shorter standby image projection time can be set to show the input image as soon as possible.

In the projector, the light source state measurement unit may include a temperature measurement unit that outputs information corresponding to the temperature of the light source unit as the measurement result.
According to the above configuration, it is possible to reduce the time until the input image is projected while preventing the user from being aware that the light source is not stable at the time of activation. This is because the temperature in the vicinity of the light source unit measured by the temperature measurement unit correlates with the stability / instability of the spectrum of the light source light at the time of start-up, so the stability / instability of the spectrum is grasped from the temperature in the vicinity of the light source unit. Because it can be done. That is, at a certain point in time of start-up, the state of the light source unit, that is, the degree of stability / instability of the spectrum is grasped as the measurement temperature by the temperature measurement unit, and the standby image projection time is automatically adjusted according to the measurement temperature. Because. In other words, when the measured temperature represents a state that takes time to stabilize the spectrum, a longer standby image projection time is set so that the user is not aware that the light source is not stable. When the measured temperature represents a state that does not require much time until the spectrum becomes stable, a shorter standby image projection time can be set to display the input image as soon as possible.

In the projector, the light source state measurement unit may include an illuminance measurement unit that outputs information corresponding to the illuminance of the light source light as the measurement result.
According to the above configuration, it is possible to reduce the time until the input image is projected while preventing the user from being aware that the light source is not stable at the time of activation. This is because the illuminance of the light source light measured by the illuminance measuring unit has a correlation with the stability / unstableness of the spectrum of the light source light at the time of activation, so that the stability / unstableness of the spectrum can be grasped from the illuminance of the light source light. Because. That is, at a certain point in time of startup, the state of the light source unit, that is, the degree of stability / instability of the spectrum is grasped as the measurement illuminance by the illuminance measurement unit, and the standby image projection time is automatically adjusted according to the measurement illuminance. Because. In other words, when the measured illuminance represents a state where it takes time to stabilize the spectrum, a longer standby image projection time is set so that the user is not aware that the light source is not stable. If the measured illuminance indicates a state that does not require much time until the spectrum is stabilized, a shorter standby image projection time can be set to show the input image as soon as possible.

In the projector, when the measurement result is less than a reference value, the projection image control unit causes the image projection unit to project the standby image until a predetermined first standby image projection time elapses, and When the measurement result is equal to or greater than a reference value, the standby image is projected on the image projection unit until a predetermined second standby image projection time shorter than the first standby image projection time elapses. Also good.
According to the above configuration, it is possible to reduce the time until the input image is projected while preventing the user from being aware that the light source is not stable at the time of activation. This is because a reference value indicating the state of the light source unit at a certain time before the spectrum is stabilized and a reference time (first standby image projection time) required until the spectrum is stabilized at the reference value are retained. For example, if the measurement result by the light source state measurement unit is less than the reference value, the reference time is set as the standby image projection time, and if the measurement result is equal to or more than the reference value, the time less than the reference time (second This is because the standby image projection time can be set as the standby image projection time. For example, if the measurement temperature / measurement illuminance is lower than the reference measurement temperature / reference measurement illuminance, the first standby image projection time is set so that the user is not aware that the light source is not stable. When the measurement temperature / measurement illuminance is higher than the reference measurement temperature / reference measurement illuminance, the second standby image projection time can be set to show the input image as soon as possible.

In the projector, the projection image control unit may cause the image projection unit to project the standby image while the measurement result is less than a reference value.
According to the above configuration, it is possible to reduce the time until the input image is projected while preventing the user from being aware that the light source is not stable at the time of activation. This is because a reference value indicating the state of the light source unit when the spectrum is stable is held, and a standby image is displayed while the measurement result by the light source state measurement unit is less than the reference value. Because the display of the standby image is stopped when the measurement result exceeds the reference value and the spectrum is stable, so that the user is not aware that the image is not stable, the input image can be shown as soon as possible. is there. For example, while the measurement temperature / measurement illuminance is lower than the reference measurement temperature / reference measurement illuminance, the standby image is displayed so that the user is not aware that the light source is not stable, while the measurement temperature / measurement illuminance is Since the display of the standby image is stopped when the spectrum becomes stable by exceeding the reference value, the input image can be shown as soon as possible.

In order to solve the above problem, a projection control method according to another aspect of the present invention is a projection control method in a projector including a light source unit and an image projection unit that projects an image using light source light from the light source unit. The light source state measurement unit of the projector measures the state of the light source unit and outputs a measurement result, and the projection image control unit of the projector performs the image projection unit after supplying power to the light source unit. A standby image projection time which is a time for projecting a predetermined standby image different from the input image before projecting the input image is controlled based on the measurement result.
According to the above configuration, the projection image control unit controls the standby image projection time based on the measurement result measured by the light source state measurement unit, similarly to the projector that is one aspect of the present invention described above. The input image can be shown as soon as possible while preventing the user from being aware that the light source is not stable.

In the projection control method, the measurement result may be information corresponding to a temperature of the light source unit.
According to the above configuration, as with the projector according to one aspect of the present invention described above, when the measured temperature indicates a state that requires time until the spectrum is stabilized, a longer standby image projection time is set. If the measured temperature is such that it does not take too much time for the spectrum to stabilize without making the user aware that the light source is not stable, a shorter standby image projection time is set. The input image can be shown as soon as possible.

In the projection control method, the measurement result may be information corresponding to illuminance of the light source light.
According to the above configuration, as with the projector according to the aspect of the present invention described above, a long standby image projection time is set when the measured illuminance indicates a state that requires time until the spectrum is stabilized. If the measured illuminance is such that the user does not need to be aware that the light source is not stable and does not require much time until the spectrum stabilizes, set a shorter standby image projection time. The input image can be shown as soon as possible.

1 is a schematic configuration diagram of a projector according to a first embodiment of the invention. 1 is a functional block diagram of a projector according to a first embodiment of the invention. 5 is a flowchart illustrating an example of the operation of the projector according to the first embodiment of the invention. 7 is a flowchart illustrating an example of another operation of the projector according to the first embodiment of the invention. 7 is a flowchart illustrating an example of another operation of the projector according to the first embodiment of the invention. It is a schematic block diagram of the projector which concerns on the 2nd Embodiment of this invention. It is a functional block diagram of the projector which concerns on the 2nd Embodiment of this invention.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram of a projector according to a first embodiment of the invention.

  As shown in FIG. 1, the projector 1 according to the first embodiment includes an illumination unit 10, an image projection unit 50, a light source state measurement unit 60, a lamp drive circuit 70, and a projection image control unit 80. The light source state measurement unit 60 includes a temperature sensor 62 (temperature measurement unit).

  The illumination unit 10 includes a light source unit 11, a first fly eye lens 12, and a second fly eye lens 13. The light source unit 11 includes a lamp 14 made of a high-pressure mercury lamp or a metal halide lamp, and a reflector 15 that reflects light from the lamp 14. Each fly-eye lens 12, 13 is composed of a plurality of lenses 16, 17. The fly-eye lenses 12 and 13 function as uniform illumination means for uniformizing the illuminance distribution of the light source light in transmissive liquid crystal light valves 30 to 32 (described later) that are illuminated areas.

  The image projection unit 50 includes a color separation / synthesis unit 20 and a projection optical system 40, and projects an image onto the screen 9 using light source light from the light source unit 11.

  The color separation / combination unit 20 includes a transmissive liquid crystal light valve for each of different colors of dichroic mirrors 21 and 22, reflection mirrors 23 to 25, relay lenses 26 to 28, R (red), G (green), and B (blue). Light modulators) 30 to 32 and a cross dichroic prism 33. The light emitted from the light source unit 11 is made uniform in illuminance distribution by the fly-eye lenses 12 and 13 in the transmissive liquid crystal light valves 30 to 32 which are illuminated areas.

  The dichroic mirrors 21 and 22 are formed, for example, by laminating a dielectric multilayer film on the glass surface, and selectively reflect light of a predetermined color and transmit light of other wavelengths. That is, the blue / green light reflecting dichroic mirror 21 transmits the red light LR of the light flux from the light source unit 11 and reflects the blue light LB and the green light LG. Further, the dichroic mirror 22 reflecting green light transmits the blue light LB and reflects the green light LG among the blue light LB and the green light LG reflected by the dichroic mirror 21.

  As a result, among the light incident from the illumination unit 10, the red light LR passes through the dichroic mirror 21, is reflected by the reflection mirror 25, and enters the red light transmissive liquid crystal light valve 30. The green light LG is reflected by the dichroic mirror 22 and enters the transmissive liquid crystal light valve 31 for green light. The blue light LB passes through the dichroic mirror 22, then passes through a relay system 29 including a relay lens 26, a reflection mirror 23, a relay lens 27, a reflection mirror 24, and a relay lens 28, and then enters the blue light transmission liquid crystal light valve 32. It is designed to be incident.

  The transmissive liquid crystal light valves 30 to 32 are configured as, for example, an active matrix transmissive liquid crystal device, and are driven based on a video signal subjected to signal processing. The color lights LR, LG, and LB modulated by the transmissive liquid crystal light valves 30 to 32 are incident on the cross dichroic prism 33.

  The cross dichroic prism 33 has a structure in which right angle prisms are bonded together, and a mirror surface that reflects the red light LR and a mirror surface that reflects the blue light LB are formed in a cross shape on the inner surface. The three color lights LR, LG, and LB are combined by these mirror surfaces to form light representing a color image, and then enlarged and projected onto the screen 9 by the projection lens 48. That is, the image projection unit 50 projects an image on the screen using the light source light from the light source unit 11.

  The projection optical system 40 has a projection lens 48. A measurement result representing the state of the light source unit is output. The light source state measurement unit 60 outputs a measurement result indicating the state of the light source unit 11 (degree of spectrum stability / instability). More specifically, the temperature sensor 62 included in the light source state measurement unit 60 outputs information corresponding to the temperature of the light source unit 11 as a measurement result. More specifically, the temperature sensor 62 measures the temperature near the light source unit 11 as information corresponding to the temperature of the light source unit 11, and outputs the measured temperature. The lamp driving circuit 70 drives the lamp 14. The projection image control unit 80 will be described with reference to FIG.

  FIG. 2 is a functional block diagram of the projector according to the first embodiment of the invention. 2 indicates a part of the illumination unit 10 and the image projection unit 50. As shown in FIG. 2, the projection image control unit 80 includes a CPU 82, an OSD generation circuit 84, a switch 85, and a panel drive circuit 86, and controls the image projection unit 50. Specifically, the projection image control unit 80 sets the standby image projection time, which is the time for projecting the standby image (mask pattern image), to the measurement result (measurement value) of the temperature in the vicinity of the light source unit 11 by the temperature sensor 62. Control based on. The standby image is an image different from the input image projected on the screen 9 after the power is supplied to the light source unit 11 (lamp 14) and before the input image is projected onto the screen 9.

  Details will be described below. The OSD generation circuit 84 generates a predetermined standby image according to the control of the CPU 82 (details will be described later). For example, the standby image generated by the OSD generation circuit 84 is an image that is difficult for the user to recognize that the light source is not stable when projected onto the screen 9, and is, for example, black or a dark background close to black Color images are preferred. As an example, FIG. 2 shows a standby image in which characters “START” are arranged on a black background. The OSD generation circuit 84 supplies the generated standby image to the panel drive circuit 86 via the switch 85 according to the control of the CPU 82 (details will be described later).

  The switch 85 switches between an input image supplied from the outside of the projection image control unit 80 and a standby image supplied from the OSD generation circuit 84 under the control of the CPU 82 (details will be described later), and supplies the switched image to the panel drive circuit 86. To do.

  The panel drive circuit 86 transmits a standby image supplied from the OSD generation circuit 84 via the switch 85 or an input image supplied from the outside via the switch 85 according to the control of the CPU 82 (details will be described later). Output to valves 30-32. The standby image or the input image output to the transmissive liquid crystal light valves 30 to 32 is projected onto the screen 9 by the image projection unit 50 using the light source light from the light source unit 11.

  As described above, the CPU 82 controls other circuits (OSD generation circuit 84, switch 85, and panel drive circuit 86) other than the CPU 82 included in the projection image control unit 80. Further, the CPU 82 controls the lamp driving circuit 80. Further, the CPU 82 acquires the above measurement result from the temperature sensor 62.

  Specifically, the CPU 82 first instructs the OSD generation circuit 84 to generate a standby image when the projector 1 is powered on. The CPU 82 instructs the switch 85 to supply the standby image supplied from the OSD generation circuit 84 to the panel drive circuit 86. The CPU 82 instructs the panel drive circuit 86 to output the standby image to the transmissive liquid crystal light valves 30 to 32. The CPU 82 transmits an activation signal to the lamp driving circuit 80 to turn on the lamp 14. Accordingly, the standby image output to the transmissive liquid crystal light valves 30 to 32 is projected onto the screen 9 by the image projection unit 50.

  Subsequently, the CPU 82 acquires the measurement result of the temperature in the vicinity of the light source unit 11 from the temperature sensor 62. When the measurement result acquired from the temperature sensor 62 is less than the reference value (threshold value), the CPU 82 causes the image projection unit 50 to project a standby image until a predetermined first standby image projection time has elapsed. In other words, when the measurement result is less than the reference value, the CPU 82 supplies the input image supplied from the outside to the panel drive circuit 86 after the first standby image projection time has elapsed. In addition to instructing, the panel drive circuit 86 is instructed to output the input image to the transmissive liquid crystal light valves 30 to 32.

  On the other hand, when the measurement result is equal to or greater than the reference value, the CPU 82 projects a standby image on the image projection unit 50 until a predetermined second standby image projection time shorter than the first standby image projection time elapses. Let In other words, when the measurement result is equal to or greater than the reference value, the CPU 82 panel-drives an input image supplied from the outside after the second standby image projection time shorter than the first standby image projection time. The switch 85 is instructed to be supplied to the circuit 86 and the panel drive circuit 86 is instructed to output the input image to the transmissive liquid crystal light valves 30 to 32.

  That is, the CPU 82 compares the measured temperature with a predetermined reference temperature for determining that it takes time until the lamp 14 is stabilized. When the measured temperature is less than the reference temperature, that is, the lamp 14 is When it is determined that it takes time to stabilize, the standby image projection is canceled when a long standby image projection time (first standby image projection time) that is predetermined as the time required for the lamp 14 to stabilize has elapsed. Then, the input image is projected on the screen 9, and when the measured temperature is equal to or higher than the reference temperature, that is, when it is determined that it does not take time until the lamp 14 is stabilized, the lamp 14 is stabilized. When a short standby image projection time (second standby image projection time) predetermined as the time required elapses, the projection of the standby image is canceled and the input image is projected onto the screen 9. Note that the second standby image projection time is shorter than the first standby image projection time.

  Hereinafter, the operation of the projector 1 will be described with reference to FIG. FIG. 3 is a flowchart illustrating an example of the operation of the projector 1. Note that the flowchart shown in FIG. 3 starts when the projector 1 is powered on.

  In FIG. 3, the CPU 82 instructs the OSD generation circuit 84 to generate a mask pattern image and also instructs the switch 85 to supply the mask pattern image supplied from the OSD generation circuit 84 to the panel drive circuit 86. . The CPU 82 instructs the panel drive circuit 86 to output the mask pattern image to the transmissive liquid crystal light valves 30 to 32. Thereby, the panel drive circuit 86 outputs the mask pattern image to the transmissive liquid crystal light valves 30 to 32 (step S10).

  Subsequently, the CPU 82 transmits an activation signal to the lamp driving circuit 80 to turn on the lamp 14 (step S12). Thereby, the image projection unit 50 projects the mask pattern image output to the transmissive liquid crystal light valves 30 to 32 onto the screen 9.

  Subsequently, the light source state measurement unit 60 measures the state of the light source unit 11 (step S14). The light source state measurement unit 60 outputs the measurement result to the CPU 82. CPU82 judges whether the measurement result acquired from the light source state measurement part 60 is more than a threshold value (step S16).

  In step S <b> 16, when the CPU 82 determines that the measurement result acquired from the light source state measurement unit 60 is not equal to or greater than the threshold (No in step S <b> 16), whether or not the first standby image projection time set in advance has elapsed. Is determined (step S18). When the CPU 82 determines that the first standby image projection time has elapsed (step S18: Yes), the CPU 82 proceeds to step S24. On the other hand, when the CPU 82 determines that the first standby image projection time has not elapsed (step S18: No), the CPU 82 repeats step S18 until it is determined that the first standby image projection time has elapsed.

  On the other hand, in step S16, when the CPU 82 determines that the measurement result acquired from the light source state measurement unit 60 is equal to or greater than the threshold (step S16: Yes), the preset second standby image projection time has elapsed. It is determined whether or not (step S20). When determining that the second standby image projection time has elapsed (step S20: Yes), the CPU 82 proceeds to step S24. On the other hand, when it is determined that the second standby image projection time has not elapsed (step S20: No), the CPU 82 repeats step S20 until it is determined that the second standby image projection time has elapsed.

  Subsequent to step S18 (Yes) or step S20 (Yes), the CPU 82 instructs the switch 85 to supply an input image supplied from the outside to the panel drive circuit 86, and transmits the input image to the transmissive liquid crystal light valve. The panel drive circuit 86 is commanded to output to 30-32. Thereby, the panel drive circuit 86 outputs the input image instead of the mask pattern image to the transmissive liquid crystal light valves 30 to 32 (step S24). Thereby, the image projection unit 50 projects the input image on the screen 9 instead of the mask pattern image. Then, the flowchart shown in FIG. 3 ends.

  The flowchart shown in FIG. 3 sets standby image projection times (first standby image projection time and second standby image projection time) having different lengths before measuring the state of the light source unit 11. Based on the subsequent measurement results, it shows an aspect of determining one standby image projection time that is actually referred to as the timing to cancel the projection of the mask pattern image, but before the measurement, the standby image projection time is set It is good also as an aspect which sets any standby image projection time (1st standby image projection time and 2nd standby image projection time) based on a measurement result after measurement.

  FIG. 4 is a flowchart illustrating an example of another operation of the projector 1. The flowchart shown in FIG. 4 sets one of the standby image projection times (first standby image projection time and second standby image projection time) based on the measurement result after measuring the state of the light source unit 11. A mode is shown. Note that steps S110, S112, S114, S116, and S124 illustrated in FIG. 4 are the same as steps S10, S12, S14, S16, and S24 illustrated in FIG.

  In step S116 of FIG. 4, when the CPU 82 determines that the measurement result acquired from the light source state measurement unit 60 is not equal to or greater than the threshold value (step S116: No), the CPU 82 sets a first standby image projection time (step S118). On the other hand, when determining in step S116 that the measurement result acquired from the light source state measurement unit 60 is equal to or greater than the threshold value (step S116: Yes), the CPU 82 sets a second standby image projection time (step S120).

  Subsequent to step S118 or step S120, the CPU 82 determines whether or not each set standby image projection time (first standby image projection time or second standby image projection time) has elapsed (step S122). . If the CPU 82 determines that the set standby image projection times have not elapsed (step S122: No), the CPU 82 repeats step S122 until it is determined that the set standby image projection times have elapsed. On the other hand, when the CPU 82 determines that each set standby image projection time has elapsed (step S122: Yes), it executes step S124, and the flowchart shown in FIG.

  In addition, although the flowchart shown in FIG. 3, FIG. 4 has shown the aspect of using two standby image projection time and one threshold value from which length differs, N pieces (N> = 3) from which length differs. The standby image projection time and (N−1) threshold values may be used. Specifically, in the case of the flowchart shown in FIG. 3, for example, four standby image projection times (standby image projection time A> standby image projection time B> standby image projection time C> standby image projection time D) and Three threshold values (threshold value a <threshold value b <threshold value c) are set. When measurement result <threshold value a, standby image projection time A is determined, and threshold value a ≦ measurement result <threshold value b. Standby image projection time B is determined, standby image projection time C is determined when threshold b ≦ measurement result <threshold c, and standby image projection time D is determined when threshold c ≦ measurement result. decide. In the case of the flowchart shown in FIG. 4, for example, the standby image projection time A is set when measurement result <threshold value a, and the standby image projection time when threshold value a ≦ measurement result <threshold value b. B is set, and when threshold value b ≦ measurement result <threshold value c, standby image projection time C is set, and when threshold value c ≦ measurement result, standby image projection time D is set.

  Note that the flowcharts shown in FIGS. 3 and 4 show a mode in which it is determined whether or not the standby image projection time determined or set has elapsed, and the timing for canceling the projection of the mask pattern image is determined. It may be determined whether or not the result is less than a threshold, and the timing for canceling the projection of the mask pattern image may be determined. That is, the mask pattern image may be projected on the image projection unit 50 while the measurement result is less than the threshold value. In other words, the state of the light source unit 11 may be constantly monitored, and the mask pattern image may be continuously projected until the threshold value is exceeded.

  FIG. 5 is a flowchart illustrating an example of another operation of the projector 1. Note that the flowchart shown in FIG. 5 shows a mode in which the state of the light source unit 11 is constantly monitored. Note that steps S210, S212, S214, and S224 illustrated in FIG. 5 are the same as steps S10, S12, S14, and S24 illustrated in FIG.

  In step S216 of FIG. 5, when the CPU 82 determines that the measurement result is less than the threshold value (step S216: No), it repeats step S216 until it determines that the measurement result is equal to or greater than the threshold value. On the other hand, when the CPU 82 determines that the measurement result is equal to or larger than the threshold (step S216: Yes), the CPU 82 executes step S224, and the flowchart shown in FIG.

  Since the light source state measurement unit 60 includes the temperature sensor 62, more specifically, in steps S <b> 14, S <b> 114, and S <b> 214 in the flowcharts illustrated in FIGS. 11 is measured (steps S14, S114, and S214), and in steps S16, S116, and S216, the CPU 82 determines whether or not the measured temperature acquired from the temperature sensor 62 is equal to or higher than the threshold (step S16). , S116, S216).

  As described above, according to the projector 1 according to the first embodiment, it is possible to show the input image as soon as possible while preventing the user from being aware that the light source is not stable at the time of activation. At a certain point in time of startup, the state of the light source unit, that is, the degree of stability / instability of the spectrum is grasped as a measurement result by the light source state measurement unit 60, and the standby image projection time is automatically adjusted according to the measurement result. Because. That is, according to the projector 1, for example, when the measurement result is less than the threshold value (reference value) and it takes time to stabilize the spectrum, the longer standby image projection time (first standby image projection) If the measurement result is above the threshold value and the spectrum does not require much time before the light source is not stable, a short time is required. Since the standby image projection time (second standby image projection time) is set, the input image can be shown as soon as possible.

  Although the temperature sensor 62 included in the light source state measurement unit 60 has been described as measuring the temperature in the vicinity of the light source unit 11, the measurement target of the temperature sensor 62 is correlated with the stability / instability of the spectrum of the light source light at the time of activation. Any temperature is acceptable.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described in detail with reference to the drawings. FIG. 6 is a schematic configuration diagram of a projector according to the second embodiment of the invention.

  As illustrated in FIG. 6, the projector 2 according to the second embodiment includes an illumination unit 10, an image projection unit 50, a light source state measurement unit 61, a lamp drive circuit 70, and a projection image control unit 81. The light source state measurement unit 61 includes an illuminance sensor 63 (illuminance measurement unit).

  The light source state measurement unit 61 outputs a measurement result representing the state of the light source unit 11 (degree of spectrum stability / instability). More specifically, the illuminance sensor 63 included in the light source state measurement unit 61 outputs information corresponding to the illuminance of the light source light as a measurement result. More specifically, the illuminance sensor 63 measures the illuminance of the light source light by the light source unit 11 as information corresponding to the illuminance of the light source light, and outputs the measured illuminance. For example, the illuminance sensor 63 measures the illuminance of light incident on the dichroic mirror 21 between the second fly-eye lens 13 and the dichroic mirror 21, as shown in FIG. The projection image control unit 81 will be described with reference to FIG. Note that the illumination unit 10, the image projection unit 50, and the lamp drive circuit 70 are the same as those of the projector 1 according to the first embodiment, and thus description thereof is omitted.

  FIG. 7 is a functional block diagram of a projector according to the second embodiment of the invention. 7 indicates a part of the illumination unit 10 and the image projection unit 50. As shown in FIG. 7, the projection image control unit 81 includes a CPU 83, an OSD generation circuit 84, a switch 85, and a panel drive circuit 86, and controls the image projection unit 50. Specifically, the projection image control unit 81, after supplying power to the light source unit 11 (lamp 14), before projecting the input image on the image projection unit 50, a predetermined standby image (mask pattern image) different from the input image. ) Is projected based on the measurement result of the illuminance of the light source light by the light source unit 11 by the illuminance sensor 63. Since the OSD generation circuit 84, the switch 85, and the panel drive circuit 86 are the same as those of the projector 1 according to the first embodiment, the description thereof is omitted.

  The CPU 83 controls other circuits (OSD generation circuit 84, switch 85, and panel drive circuit 86) included in the projection image control unit 81. Further, the CPU 83 controls the lamp driving circuit 80. Further, the CPU 83 acquires the above measurement result from the illuminance sensor 63.

  Specifically, the CPU 83 first instructs the OSD generation circuit 84 to generate a standby image when the projector 1 is powered on. The CPU 83 instructs the switch 85 to supply the standby image supplied from the OSD generation circuit 84 to the panel drive circuit 86. The CPU 83 instructs the panel drive circuit 86 to output the standby image to the transmissive liquid crystal light valves 30 to 32. The CPU 83 transmits a start signal to the lamp driving circuit 80 to turn on the lamp 14. Accordingly, the standby image output to the transmissive liquid crystal light valves 30 to 32 is projected onto the screen 9 by the image projection unit 50.

  Subsequently, the CPU 83 acquires the measurement result of the illuminance of the light source light by the light source unit 11 from the illuminance sensor 63. When the measurement result acquired from the illuminance sensor 63 is less than the reference value (threshold value), the CPU 83 causes the image projection unit 50 to project a standby image until a predetermined first standby image projection time has elapsed. In other words, when the measurement result is less than the reference value, the CPU 83 causes the switch 85 to supply an input image supplied from the outside to the panel drive circuit 86 after the first standby image projection time has elapsed. In addition to commanding, the panel drive circuit 86 is commanded to output the input image to the transmissive liquid crystal light valves 30 to 32.

  On the other hand, when the measurement result is equal to or greater than the reference value, the CPU 83 projects a standby image on the image projection unit 50 until a predetermined second standby image projection time shorter than the first standby image projection time elapses. Let In other words, when the measurement result is equal to or greater than the reference value, the CPU 83 drives the input image supplied from the outside after the second standby image projection time shorter than the first standby image projection time has passed. The switch 85 is instructed to be supplied to the circuit 86 and the panel drive circuit 86 is instructed to output the input image to the transmissive liquid crystal light valves 30 to 32.

  That is, the CPU 83 compares the measured illuminance with a predetermined reference illuminance for determining that it takes time until the lamp 14 is stabilized. When the measured illuminance is smaller than the reference illuminance, that is, the lamp 14 is When it is determined that it takes time to stabilize, the standby image projection is canceled when a long standby image projection time (first standby image projection time) that is predetermined as the time required for the lamp 14 to stabilize has elapsed. When the measured illuminance ≧ reference illuminance, that is, when it is determined that it does not take time for the lamp 14 to stabilize, the input image is projected on the screen 9 until the lamp 14 is stabilized. When a short standby image projection time (second standby image projection time) predetermined as the time required elapses, the projection of the standby image is canceled and the input image is projected onto the screen 9.

  The operation of the projector 2 is the same as that of the projector 1 according to the first embodiment shown in FIGS. That is, the CPU 82 of the projector 1 is an operation for acquiring a measurement result representing the state of the light source unit 11 from the light source state measurement unit 60 and controlling the standby image projection time according to the measurement result, whereas the CPU 83 of the projector 2 is. Is different from the operation of acquiring the measurement result representing the state of the light source unit 11 from the light source state measurement unit 61 and controlling the standby image projection time according to the measurement result. This is the same as the projector 1 according to the first embodiment shown in FIG. That is, the CPU 82 of the projector 1 acquires the measured temperature near the light source unit 11 from the temperature sensor 62 and controls the standby image projection time according to the measured temperature, whereas the CPU 83 of the projector 2 The measurement illuminance of the light source light by the light source unit 11 is obtained from the sensor 63 and the standby image projection time is controlled according to the measurement illuminance. The other operations are the same as those shown in FIGS. This is the same as the projector 1 according to the first embodiment.

  As described above, according to the projector 2 according to the second embodiment, it is possible to show the input image as soon as possible while preventing the user from being aware that the light source is not stable at the time of activation. This is because the illuminance of the light source light measured by the illuminance sensor 63 correlates with the stability / unstableness of the spectrum of the light source light at the time of activation, so that the stability / unstableness of the spectrum can be grasped from the illuminance of the light source light. Because. That is, according to the projector 2, for example, when the measured illuminance is less than the reference illuminance (reference value) and it takes time to stabilize the spectrum, the longer standby image projection time (first standby image) When the measured illuminance is higher than the reference illuminance and the spectrum is stable, it is not necessary to make the user aware that the light source is not stable. Since a shorter standby image projection time (second standby image projection time) is set, the input image can be shown as soon as possible.

  In addition, in the place where the illuminance sensor 63 measures illuminance, the relationship between the measured illuminance and the spectrum state is confirmed in advance. For example, when the reference illuminance when the spectrum is not yet stable and the reference illuminance And the reference time required until the spectrum is stabilized, and the projection image control unit 81 (CPU 83) determines that the illuminance measured by the illuminance sensor 63 is less than the reference illuminance, the reference time or the reference time or more. Is the first standby image projection time, and if the illuminance measured by the illuminance sensor 63 is equal to or higher than the reference illuminance, the first and first times are set so that the time less than the reference time is the second standby image projection time. 2 standby image projection times may be determined.

  In the second embodiment, it has been described that the illuminance sensor 63 measures the illuminance of light incident on the dichroic mirror 21 at a position in front of the dichroic mirror 21, but the location of the illuminance sensor 63 or the light to be measured is It is not limited to this. That is, the measurement target of the illuminance sensor 63 may be light that has a correlation with the stability / unstableness of the spectrum of the light source light at the time of activation. For example, the blue light LB transmitted through the dichroic mirror 22 at the position P in FIG. The illuminance may be measured. Note that when the lamp 14 is a mercury lamp, the blue light LB is weaker or unstable at the time of startup than the red light LR and the green light LG, and thus the stability / unstableness of the lamp 14 at the time of startup is confirmed. Sometimes it is also effective to measure the illuminance of the blue light LB. In addition, by providing a filter in front of the illuminance sensor 63, the illuminance of blue light may be measured not at the position P but at a position in front of the dichroic mirror 21 shown in the embodiment. However, as described above, the measurement target of the illuminance sensor 63 may be light that has a correlation with the stability / unstableness of the spectrum of the light source light at the time of activation, and according to the configuration of the color separation / synthesis unit 20, the dichroic mirror 21. Light such as light incident on the light, red light LR, and green light LG may be measured.

  As described above, according to the projector 1 according to the first embodiment or the projector 2 according to the second embodiment, the input is made as soon as possible while preventing the user from being aware that the light source is not stable at the time of activation. You can show an image. In other words, according to the projector 1 (or the projector 2), when the stability of the lamp 14 is likely to be delayed, an image that is difficult for the user to recognize that the light source is not stable is displayed. On the other hand, when the stability of the lamp 14 is likely to be accelerated, the user can be quickly shown the input image, which improves the convenience for the user.

  In the projector 1 according to the first embodiment and the projector 2 according to the second embodiment, the reference value to be compared with the measurement result confirms the relationship between the measurement temperature (or measurement illuminance) and the spectrum state in advance. Although it has been described that it is determined (maintained) as a reference temperature (reference illuminance) when the spectrum is not yet stable, the spectrum of the light source light of the lamp 14 changes over time according to the usage time. The determined reference value may be corrected according to the usage time of the projector 1 (or projector 2).

  For example, in the projector 2, a correction table indicating a correction value corresponding to the total operating time is held, and the projector 2 manages (counts and stores) the total operating time, and the measurement result (measurement) acquired from the illuminance sensor 63 is measured. Illuminance), reference value (reference illuminance), the above correction table, and the current total operating time, when measured illuminance <reference illuminance (after correction), the first standby image projection time The projection of the standby image is canceled at the elapse of time, and when the measured illuminance ≧ reference illuminance (after correction), the projection of the standby image is canceled at the elapse of the second standby image projection time, and the input image is projected onto the screen 9 You may make it make it. The reference illuminance (after correction) is obtained by reading a correction value corresponding to the current total operating time from the correction table and reflecting the correction value in the reference value (reference illuminance). Similarly, in the projector 1, when the measured temperature <the reference temperature (after correction), the projection of the standby image is canceled when the first standby image projection time has elapsed, and the measurement temperature ≧ the reference temperature (after correction) ), The projection of the standby image may be canceled when the second standby image projection time elapses, and the input image may be projected onto the screen 9.

  Note that the projector 1 according to the first embodiment measures the temperature in the vicinity of the light source unit 11, and the projector 2 according to the second embodiment measures the illuminance of the light source light from the light source unit 11. However, the standby image projection time may be controlled according to the measured temperature and the measured illuminance by measuring the measured temperature and the measured illuminance. That is, the light source state measurement unit may include both the temperature sensor 62 and the illuminance sensor 63.

  In the embodiment of the present invention, the projectors 1 and 2 using the transmissive liquid crystal light valves 30 to 32 as the light modulation device are exemplified, but the present invention is not limited, and the reflection device is used as the light modulation device. A liquid crystal light valve can be adopted. Further, the color separation / synthesis unit can be appropriately configured according to the type of the light modulation device to be employed. Furthermore, the number of light modulation devices is not limited to three, and the image projection unit may be configured using one or more light modulation devices.

  A program for executing each process of the projectors 1 and 2 according to the embodiment of the present invention is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed. Accordingly, the above-described various processes related to the projectors 1 and 2 according to the embodiment of the present invention may be performed. Here, the “computer system” may include an OS and hardware such as peripheral devices. Further, the “computer system” includes a homepage providing environment (or display environment) if the WWW system is used. “Computer-readable recording medium” means a flexible disk, a magneto-optical disk, a ROM, a writable non-volatile memory such as a flash memory, a portable medium such as a CD-ROM, a hard disk built in a computer system, etc. This is a storage device.

  Further, the “computer-readable recording medium” refers to a volatile memory (for example, DRAM (Dynamic DRAM) in a computer system that becomes a server or a client when a program is transmitted through a network such as the Internet or a communication line such as a telephone line. Random Access Memory)), etc., which hold programs for a certain period of time. The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, what is called a difference file (difference program) may be sufficient.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes designs and the like that do not depart from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1, 2 ... Projector, 9 ... Screen, 10 ... Illumination part, 11 ... Light source part, 12 ... 1st fly eye lens, 13 ... 2nd fly eye lens, 14 ... Lamp, 15 ... Reflector, 16, 17 ... Lens, DESCRIPTION OF SYMBOLS 20 ... Color separation composition part, 21, 22 ... Dichroic mirror, 23, 24, 25 ... Reflection mirror, 26, 27, 28 ... Relay lens, 29 ... Relay system, 30 ... Transmission type liquid crystal light valve for red light, 31 ... Green light transmissive liquid crystal light valve, 32 ... Blue light transmissive liquid crystal light valve, 33 ... Cross dichroic prism, 40 ... Projection optical system, 48 ... Projection lens, 50 ... Image projection unit, 60, 61 ... Light source state measurement , 62 ... temperature sensor (temperature measurement part), 63 ... illuminance sensor (illuminance measurement part), 70 ... panel drive circuit, 80, 81 ... projection image control part, 82, 3 ... CPU, 84 ... OSD generation circuit, 85 ... switch

Claims (7)

A light source unit;
An image projection unit that projects an image using light source light from the light source unit;
A light source state measurement unit that outputs a measurement result representing the state of the light source unit;
A projection image control unit for controlling the image projection unit,
The projected image control unit
Measurement of a standby image projection time, which is a time for projecting a predetermined standby image different from the input image before projecting the input image on the image projection unit after power supply to the light source unit, by the light source state measurement unit Control based on the results ,
When the measurement result is less than a reference value, until the predetermined first standby image projection time has elapsed, the image projection unit projects the standby image,
If the measurement result is less than the reference value, until the lapse of the first waiting image projection time shorter predetermined second than waiting image projection time, Rukoto by projecting the standby image on the image projection unit Projector.   The projector according to claim 1, wherein the light source state measurement unit includes a temperature measurement unit that outputs information corresponding to a temperature of the light source unit as the measurement result.   The projector according to claim 1, wherein the light source state measurement unit includes an illuminance measurement unit that outputs information corresponding to the illuminance of the light source light as the measurement result. The projected image control unit
The projector according to claim 1, wherein the standby image is projected on the image projection unit while the measurement result is less than a reference value. A projection control method in a projector including a light source unit and an image projection unit that projects an image using light source light from the light source unit, wherein the light source state measurement unit of the projector measures the state of the light source unit. The measurement result is output, and the projection image control unit of the projector projects a predetermined standby image different from the input image before projecting the input image to the image projection unit after supplying power to the light source unit. The standby image projection time is controlled based on the measurement result. When the measurement result is less than a reference value, the standby image projection unit waits until the predetermined first standby image projection time elapses. When an image is projected and the measurement result is equal to or greater than a reference value, the image is output until a predetermined second standby image projection time shorter than the first standby image projection time elapses. It is projecting the standby image on the elevation unit projection control method comprising Rukoto. The projection control method according to claim 5 , wherein the measurement result is information corresponding to a temperature of the light source unit. The measurement results are projected control method according to claim 5 or 6, characterized in that the information corresponding to the illuminance of the light source light.

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