JP2007235665A - Projection type display device, projection television, and control method and control program of projection type display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection type display device that outputs an AV signal of a broadcast received during replacement of a lamp as a light emitting means of a light source and before the lamp is turned on to obtain predetermined luminance. <P>SOLUTION: The projection type display device includes a broadcast receiving 54 which receives the broadcast, a light source unit 92 which emits luminous flux by supplying electric power to the lamp 48 as the light emitting means, a light intensity measuring unit 60 which measures the intensity of the luminous flux emitted by the light source unit 92, and an output control unit 62 which makes the AV signal output unit 64 output the AV signal of the broadcast received by the broadcast receiving unit 54 when the lamp 48 is supplied with the electric power and the intensity of the luminous flux measured by the light intensity measuring unit 60 does not exceed a certain value. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a projection display device, a projection television, a projection display device control method, and a projection display device control program.

  A projection display device that displays an image formed on a non-luminous display element such as a liquid crystal display element by enlarging and projecting the image on a screen or the like can easily realize an image display larger in size than the display element. The present invention is applied to a projector and a projection television that projects a received broadcast program on a large screen as described in Patent Document 1 below. Further, in this type of display device, a high-pressure mercury lamp, a xenon lamp, a metal halide lamp or the like having a high luminous intensity and a high point light source property is used as a light source, so that the viewer can replace the light source relatively easily. Therefore, when the light source is deteriorated or damaged, the ideal display state at the initial stage of the product can be easily reproduced by replacing the light source.

JP 2005-134858 A

  However, since the lamp described above requires 1-2 minutes to reach a sufficient brightness to be suitable for video viewing after lighting, the broadcast information can be viewed with sufficient image quality during that period. There wasn't. In addition, the lamp life is relatively short, from 100 hours to 10,000 hours, and the lamp may be suddenly cut off during image display due to lamp usage and quality fluctuations. Therefore, it is necessary to replace the lamp each time. In that case, it takes time to cool the lamp that has become hot due to lighting, time for lamp replacement work by the viewer, lighting time after lamp replacement (rise time to a predetermined brightness), etc. It was necessary to interrupt the video display until these operations were completed. Therefore, a viewer who uses a projection television to which such a projection display device is applied cannot obtain (view) information broadcast while video display is interrupted due to an unexpected lamp replacement.

  In order to solve the above-described problems, the projection display apparatus of the present invention forms an optical image by modulating a light beam according to image information obtained by receiving a broadcast, and projects the formed optical image. A projection display device that displays a broadcast, a light receiving unit that receives a broadcast, a light source unit that emits a light beam by supplying power to a light emitting unit, and a light that measures the intensity of the light beam emitted from the light source unit An intensity measurement unit, an output unit that outputs an audio / video (AV) signal including at least a video signal, and a state in which power is supplied to the light emitting unit, and the intensity of the light beam measured by the light intensity measurement unit An output control unit that outputs a broadcast AV signal received by the receiving unit to the output unit when the signal does not exceed a certain value.

  According to the present invention, when the power is supplied to the light emitting means and the intensity of the light emitted from the light emitting means does not exceed a certain value, the output control unit transmits the received broadcast. Since the AV signal is output from the output unit, the viewer obtains the AV signal output from the output unit, so that the light emitting means cannot emit light or cannot emit light at a predetermined intensity. Information broadcast under conditions where projection display is not possible is possible.

  In the projection display apparatus according to the aspect of the invention, the output control unit may further transition from a state where the intensity of the light beam measured by the light intensity measurement unit does not exceed the certain value to a state where the certain value exceeds the certain value. In this case, it is preferable that the output of the AV signal by the output unit is terminated.

  According to the present invention, when the intensity of the light beam transitions from a state where it does not exceed a certain value to a state where it exceeds a certain value, the output of the AV signal output from the output unit is terminated by the output control unit. Therefore, the output of the AV signal from the output unit can be limited only to a projection display state in which viewing is impossible.

  In the projection display device according to the aspect of the invention, the light emitting unit is replaceable, and further includes a detection unit that detects a state where the light emitting unit needs to be replaced, and the output control unit further includes the detection unit. A broadcast AV signal received by the receiving unit in response to the state detection may be output to the output unit.

  According to the present invention, since the state where the light emitting means should be replaced is detected by the detection unit, the AV signal can be output from the output unit even in the state where the light emitting means should be replaced.

  It is preferable that the projection display apparatus of the present invention further includes a storage unit that stores the broadcast AV signal output from the output unit.

  According to the present invention, the AV signal output from the output unit can be stored and stored.

  It is preferable that the projection display apparatus of the present invention further includes an instruction unit that instructs at least the operation related to the storage.

  According to the present invention, various operations including operations related to storage can be easily instructed by the instruction unit.

  It is preferable that the projection display apparatus of the present invention further includes a display unit that displays at least one of the operation information relating to the storage and the information relating to the replacement of the light emitting means.

  According to the present invention, since at least one of the operation information related to storage and the information related to the replacement of the light emitting means is displayed on the display unit, the information related to the storage operation and the replacement of the light emitting means can be easily visually confirmed.

  In the projection display device according to the aspect of the invention, the display unit may display the information to be displayed so as to be superimposed on a projected optical image. According to the present invention, since information is displayed on the projected screen, a large amount of information can be displayed and the visibility for the viewer is improved.

  It is preferable that the projection display apparatus of the present invention further includes a video reproduction unit that reproduces the AV signal stored in the storage unit.

  According to the present invention, the AV signal stored and stored in the storage unit can be played back and viewed by the video playback unit.

  It is preferable that the projection display apparatus of the present invention further includes a transmission unit that transmits the broadcast AV signal output from the output unit by communication.

  According to this invention, the AV signal output from the output unit can be sent to the outside by the transmission unit.

  And, by applying the above-described projection display device to a projection television that integrally receives a transmissive screen and receives and displays broadcast image information on the transmissive screen from the back, it is convenient for viewers. A good projection TV can be provided.

  In order to solve the above-described problems, a control method for a projection display device according to the present invention forms an optical image by modulating a light beam emitted from a light source unit according to image information obtained by receiving a broadcast. A method for controlling a projection display apparatus that projects and displays the formed optical image, a light intensity measuring step for measuring the intensity of a light beam emitted from a light source unit, and a constant intensity of the measured light beam An intensity determination step for determining whether or not the value exceeds the value, and a memory for storing an audio / video (AV) signal of the received broadcast if the intensity of the luminous flux does not exceed the predetermined value as a result of the determination And a storage operation ending step of ending the operation of storing the AV signal when the intensity of the light flux does not exceed the certain value as a result of the determination, and transitions to a state exceeding the certain value. And characterized by comprising That.

  According to the present invention, when the power is supplied to the light emitting means and the intensity of the light emitted from the light emitting means does not exceed a certain value, the output control unit transmits the received broadcast. Since the AV signal is output from the output unit, the viewer can view the AV signal output from the output unit as if the light emitting means cannot emit light or cannot emit light at a predetermined intensity. Information broadcast in a state where it cannot be projected and displayed can be acquired.

  In order to solve the above-described problems, a control program for a projection display apparatus according to the present invention forms an optical image by modulating a light beam emitted from a light source unit according to image information obtained by receiving a broadcast. A control program for a projection display device that projects and displays the formed optical image, the light intensity measurement procedure for measuring the intensity of the light beam emitted from the light source unit, and the intensity of the measured light beam being constant An intensity determination procedure for determining whether or not the value exceeds the value, and a memory for storing a received broadcast audio / video (AV) signal if the intensity of the luminous flux does not exceed the predetermined value as a result of the determination And a storage operation ending procedure for ending the operation of storing the AV signal when the intensity of the light flux does not exceed the certain value as a result of the determination and transitions to a state exceeding the certain value. And Characterized in that to execute the over data.

  According to the present invention, when the power is supplied to the light emitting means and the intensity of the light emitted from the light emitting means does not exceed a certain value, the output control unit transmits the received broadcast. Since the AV signal is output from the output unit, the viewer can view the AV signal output from the output unit as if the light emitting means cannot emit light or cannot emit light at a predetermined intensity. Information broadcast in a state where it cannot be projected and displayed can be acquired.

Hereinafter, an embodiment of the present invention will be described using a light valve type projection television 1 as an example of a projection display device.
(Embodiment)

  FIG. 1 is a diagram illustrating a hardware configuration of the projection television 1. The projection television 1 modulates a light beam obtained by shaping light emitted from a lamp 48 as a light emitting means by a liquid crystal light valve 50 as a display element in accordance with image (video) information obtained by receiving a broadcast. Thus, the television receiver is configured to form an optical image, and to enlarge and project the formed optical image onto a screen (not shown) from the rear surface by the projection lens 52 and display it. The hardware configuration of the projection TV 1 includes a CPU (Central Processing Unit) 10, a RAM (Random Access Memory) 12, a ROM (Read Only Memory) 14, an input / output I / F (Interface) 16, and lamp control. The circuit 18 includes a light intensity detection circuit 20, a reception circuit 22, a communication I / F 24, an image memory 26, a video decoder 28, a video processor 30, and a light valve drive circuit 32. These hardware are connected to each other by a bus 46 so that each signal can be transmitted and received.

  The CPU 10 reads various programs and data such as a basic control program stored in the ROM 14, develops and executes these various programs and data in a main memory area provided in the RAM 12, and controls each unit included in the projection television 1. To do.

  The light intensity detection circuit 20 is installed on the optical path of the light source unit 92 or at a position outside the optical path where the light from the light source unit 92 can be received in order to measure the intensity of light emitted from the light source unit 92 (FIG. 2). The electrical signal output from the light intensity sensor 40 is sampled and input at a predetermined interval, and the input electrical signal is converted into digital data and output. The light intensity sensor 40 can employ a light receiving element such as a photodiode that outputs a current corresponding to the intensity of light.

  The receiving circuit 22 receives an operation signal transmitted from the operation remote controller 42 by being superimposed on light, sound waves, or the like, extracts the operation signal, converts the operation signal into a predetermined data format, and outputs it.

  The communication I / F 24 exchanges various data via the communication device 44. In this embodiment, as the communication device 44, a network communication device that communicates with the outside via the network 82 (FIG. 2), a small information terminal 80 (FIG. 2) using UWB (Ultra WideBand), Bluetooth (registered trademark), or the like. ) Etc. can be employed.

  A tuner 34, a storage device 36, and a display indicator 38 are connected to the input / output I / F 16 according to a predetermined standard. The tuner 34 has a function of receiving a radio wave of television broadcasting and extracting and outputting an audio / video (AV) signal included in the received radio wave and including at least a video signal. The storage device 36 has a function of storing (recording) TV broadcast AV signals, such as a semiconductor memory, HDD (Hard Disk Drive), or DVD (Digital Versatile Disc) recorder. In addition, the display indicator 38 is configured by, for example, an LED (Light Emitting Diode) lamp. In the present embodiment, although not shown, at least an indicator indicating “Lamp Replacement” and “Lamp Driving” are displayed. An indicator, an indicator indicating “recording”, and an indicator indicating “recorded” are provided. In addition, the indicator may indicate each state by a color state at the time of lighting, a lighting state, a blinking state, and a light-off state.

  The video decoder 28 performs A / D (Analog to Digital) conversion on the analog image signal included in the AV signal input from the tuner 34, expands the compressed digital image signal, and the like, and performs video processing. 30 is converted into a digital image signal that can be input. The video processor 30 receives the digital image signal converted by the video decoder 28 and executes various image processing. By this image processing, for example, each pixel of the digital image is decomposed into red, green, and blue color lights, and an image signal is generated for each color light. Further, the image memory 26 is a memory for temporarily storing digital image signals in order to perform these image processes.

  The light valve drive circuit 32 supplies a drive voltage to the pixels of the liquid crystal light valve 50 configured for each color light of red, green, and blue according to the image signal for each color light generated by the video processor 30.

  The lamp control circuit 18 controls the power supplied to the lamp 48 to adjust the lighting and extinction of the lamp 48, the illuminance of the projected image, and the like, and obtains voltage information applied to the lamp 48. Output. The lamp 48 used in the projection television 1 of this embodiment is any lamp (for example, a high-pressure mercury lamp, a metal halide lamp, a xenon lamp, or a halogen lamp) as long as it has a high luminous intensity and a high point light source. It may be a solid light source such as an LED or a laser.

  FIG. 2 is a diagram illustrating a functional configuration of the projection television 1. The projection television 1 includes a broadcast receiving unit 54, an AV signal processing unit 56, an image signal generation unit 58, a light intensity measurement unit 60, an output control unit 62, an AV signal output unit 64, and an operation display unit 66. A video reproduction unit 68, an operation information generation unit 70, an operation instruction unit 72, an AV signal storage unit 74, an AV signal transmission unit 76, a lamp state detection unit 78, a light source control unit 86, and an enlarged projection. Part 90. The enlargement projection unit 90 includes a light source unit 92, a projection image generation unit 94, and a projection lens 52.

  The broadcast receiving unit 54 extracts an AV signal from the received broadcast. The extracted AV signal is sent to the AV signal processing unit 56. Note that the form of broadcasting is not limited to broadcasting using radio waves as a medium, but may be cable television broadcasting using optical transmission or the like, or live distribution via a network.

  The AV signal processing unit 56 generates a digital image signal composed of time-sequential image frames from the AV signal input from the broadcast receiving unit 54 or the video reproduction unit 68. The generated digital image signal is sent to the image signal generator 58 and the AV signal output unit 64. The AV signal processing unit 56 has a function of processing a digital image signal so that the character string sent from the motion information generation unit 70 is superimposed on the image and displayed.

  The image signal generator 58 generates a projectable image signal from the digital image signal input from the AV signal processor 56. The generated signal is sent to the projection image generation unit 94. The AV signal output unit 64 outputs the digital image signal input from the AV signal processing unit 56 in accordance with an instruction from the output control unit 62. Here, the AV signal output from the AV signal output unit 64 is sent to the AV signal storage unit 74 and the AV signal transmission unit 76. Information regarding instructions from the output control unit 62 is sent to the operation information generation unit 70.

  Here, the function of the enlargement projection unit 90 will be outlined. The enlargement projection unit 90 is substantially the same as the projection optical system employed in the front projector and rear projector, and the light source unit 92 includes a lamp 48 and an illumination optical system 96 to generate illumination light. Although not shown, the illumination optical system 96 includes a lens array, a polarizing element, and the like, and has a function of shaping light emitted from the lamp 48 into a light flux with uniform illuminance. The light intensity sensor 40 described above is installed at a position where this light beam can be received. The projection image generation unit 94 separates the light flux into red, green, and blue color light by a color separation unit (not shown), performs modulation according to the image signal with the liquid crystal light valve 50 for each color light, and It has a function of generating an optical image by combining the modulated image with a color combining means (not shown). Further, the projection lens 52 has a function of projecting and displaying an optical image synthesized by the color synthesizing means at a predetermined magnification. Detailed contents regarding each function of the enlargement projection unit 90 are not the gist of the present invention, and thus are omitted (refer to, for example, Japanese Patent Application Laid-Open No. 2002-350781).

  The light source controller 86 controls the power supplied to the lamp 48 and sends information about the power supplied to the lamp 48 to the lamp state detector 78. In the present embodiment, the power supply to the lamp 48 and the power supply to other than the lamp 48 of the projection television 1 can be controlled independently. Therefore, when replacing the lamp 48, only the supply of power to the lamp 48 can be stopped.

  The light intensity measurement unit 60 measures the intensity of the light beam emitted from the light source unit 92, that is, the intensity of the illumination light. Specifically, the light intensity sensor 40 and the light intensity detection circuit 20 generate data indicating the intensity of the illumination light, and the generated data is sent to the output control unit 62 and the lamp state detection unit 78.

  The lamp state detection unit 78 includes information on the power source that supplies power to the lamp 48 sent from the light source control unit 86, the voltage applied to the lamp 48, and data indicating the intensity of illumination light sent from the light intensity measurement unit 60. From this, a state in which the lamp 48 needs to be replaced, that is, a state in which the lamp 48 is burned out or a power supply state to the lamp 48 is detected. The information detected here is sent to the output control unit 62.

  The output control unit 62 outputs an AV signal from the AV signal output unit 64 according to data indicating the intensity of illumination light transmitted from the light intensity measurement unit 60 and information indicating the state of the lamp 48 transmitted from the lamp state detection unit 78. To control. Here, output control of the AV signal by the output control unit 62 will be described with reference to FIG. FIG. 3 is a graph showing the relationship between the time from the start of lighting of the lamp 48 and the intensity (light intensity) of illumination light emitted from the light source unit 92. As shown in this graph, the lamp 48 used in the projection television 1 requires about 30 seconds to 2 minutes (T2) from when the power is turned on until the light intensity is stabilized (B2). Are known. The minimum light intensity (B1) required to project an image varies depending on the characteristics of the lamp 48, and can be set as a constant at the time of product shipment or can be set by the user.

The output control unit 62 performs the following control with reference to the data and information described above.
(1) When the voltage applied to the lamp 48 is 0 (phase 1) even though power is supplied to the lamp 48 (phase 1), the output control unit 62 is in a state in which the lamp 48 is turned off by the lamp state detection unit 78. The AV signal sent from the AV signal processing unit 56 is outputted from the AV signal output unit 64.
(2) When power is supplied to the lamp 48 and a voltage is applied to the lamp 48 and the light intensity does not exceed B1 (phase 2), the output control unit 62 activates the lamp 48. The AV signal sent from the AV signal processing unit 56 is output from the AV signal output unit 64 by determining that it is in the initial state.
(3) When power is supplied to the lamp 48 and a voltage is applied to the lamp 48, and the light intensity exceeds B1 (phase 3), the output control unit 62 activates the lamp 48. It is determined that the state is the end state, and the output of the AV signal from the AV signal output unit 64 is ended. However, when transitioning from phase 2 to phase 3, in order not to end the program indicated by the output AV signal halfway, the instruction of the operation instruction unit 72 operated by the viewer to end or continue the output of the AV signal You may follow.

  The AV signal storage unit 74 stores the AV signal output from the AV signal output unit 64 in the storage device 36 described above. The AV signal transmission unit 76 transmits the AV signal output from the AV signal output unit 64 to the network 82 and the small information terminal 80 via the communication device 44 described above. As a result, for example, the small information terminal 80 having the display means can receive and reproduce the AV signal at a remote location. Note that the above AV signal storage and transmission can be set in advance by the viewer. Therefore, the AV signal may be stored in the AV signal storage unit 74 and may be transmitted from the AV signal transmission unit 76, or only one of storage or transmission can be set.

  The operation information generation unit 70 receives information related to the instruction sent from the AV signal output unit 64 and displays the operation display unit 66 according to the instruction content. Specifically, the LED corresponding to the operation is turned on in a predetermined state from the display indicator 38 described above. In addition, the operation information generation unit 70 stores character string information corresponding to the operation, such as information indicating an AV signal information source such as a broadcast channel number, storage start time, storage end time, storage time, storage destination, and the like. The character string can be generated and sent to the AV signal processing unit 56 to be displayed superimposed on the projected image. As a result, the character string sent to the AV signal processing unit 56 is superimposed on the projected image.

  The video reproduction unit 68 reproduces the AV signal stored in the AV signal storage unit 74 in time series. Since this playback speed can be set, for example, in order to catch up with the currently broadcasted program, the setting for reproducing the stored AV signal at high speed or the commercial part is automatically detected and the part is skipped. Can also be set to play. The AV signal reproduced by the video reproduction unit 68 is sent to the AV signal processing unit 56 and projected and displayed by the enlargement projection unit 90 in the same manner as the received AV signal. In addition, the operation instruction unit 72 can instruct to operate each function unit described above, including a storage operation in the AV signal storage unit 74, via the operation remote controller.

  The functional units of the projection television 1 have been described above. These functions are realized by organic cooperation between the hardware resources and software described above.

  FIG. 4 is a flowchart showing the flow of processing in the projection television 1 and will be described according to this flowchart.

  First, when the projection television 1 is activated, a light intensity measurement step is executed, and the intensity of illumination light emitted from the light source unit 92 is measured by the light intensity measurement unit 60 (step S100).

  Next, an intensity determination step is executed, and it is determined by the output control unit 62 whether or not the intensity of the illumination light is equal to or greater than a specified value (B1) (step S101). Here, if the intensity of the illumination light is equal to or greater than the specified value (Yes in step S101), the series of processes is terminated. On the other hand, when the intensity of the illumination light does not reach the specified value (No in step S101), the lamp state detection unit 78 detects the lamp state (step S102).

  Here, when the lamp state detection unit 78 detects a lamp burnout (Yes in step S103), a process of determining whether or not there is an instruction from the viewer after the lamp replacement process (step S110) is executed (step S110). Go to S112). The details of the lamp replacement process (step S110) will be described later. On the other hand, if the lamp state detection unit 78 does not detect that the lamp has run out (No in step S103), a storage (recording) process is executed. That is, the output control unit 62 determines that the lamp 48 is in the initial startup state, instructs the AV signal output unit 64 to output the AV signal, and stores the output AV signal in the AV signal storage unit 74. Recording of the broadcast content is started (step S104).

  Subsequently, the operation information generating unit 70 displays information corresponding to the recording during the operation display unit 66. Specifically, the corresponding display indicator 38 is turned on in a predetermined state during recording (step S106). Further, on the projected image, a message indicating that recording is in progress and the contents of the recording (for example, information such as the recording start time and recording channel) are displayed in a superimposed manner (step S108).

  In the state where the broadcast content is recorded by the above-described processing, the instruction sent from the viewer can always be received via the operation instruction section 72, and the processing is selected according to the received instruction (step S112). Here, when the instruction from the viewer is the end of recording (“end” in step S112), the process proceeds to the process of ending the recording (step S120). If the instruction from the viewer is to continue recording (“continuation” in step S112), the state following the instruction is continued after waiting for the instruction from the viewer (step S112). Further, when there is no instruction from the viewer (“None” in step S112), the light intensity measurement unit 60 measures the intensity of illumination light emitted from the light source unit 92 (step S113).

  Subsequently, the output controller 62 determines whether or not the intensity of the illumination light is equal to or higher than a specified value (B1) (step S114). Here, when the intensity of the illumination light does not reach the specified value (No in step S114), the process returns to a state (step S112) after waiting for an instruction from the viewer. On the other hand, when the intensity of the illumination light is equal to or higher than the specified value (Yes in step S114), the output control unit 62 determines that the lamp 48 is in a start-up state, and the display indicator 38 is lit in a predetermined state. Information indicating that the intensity of the illumination light has reached the specified value is displayed on the projected image (step S116).

  Upon receiving the information in step S116, the viewer determines whether or not to end the recording at this point from the program break, taking into account the contents of the currently recorded program, and instructs the operation instruction unit 72 (If the viewer wishes to continue recording, no instruction is required). In response to this, it is determined whether or not an instruction to end the recording is given by the viewer (step S118). Here, when the instruction to end the recording is not issued (No in step S118), the process returns to the state (step S112) after waiting for the instruction from the viewer. On the other hand, when an instruction to end the recording is issued (Yes in step S118), the storage operation end process is executed, and the output control unit 62 stops the output of the AV signal from the AV signal output unit 64, and the AV signal Recording in the storage unit 74 is terminated (step S120).

  Subsequently, the display indicator 38 corresponding to the recorded state is turned on in a predetermined state (step S122). Further, on the projected image, a message indicating that the recording has been completed and a recording content (for example, information such as a recording period and a recording channel) is superimposed (step S124), and the series of processes is completed.

  Next, the lamp replacement process (step S110) will be described with reference to the lamp replacement flowchart of FIG.

  When the lamp replacement is executed, first, the output control unit 62 instructs the AV signal output unit 64 to output the AV signal, and the output AV signal is stored in the AV signal storage unit 74 and is broadcasted. Is started (step S200).

  Subsequently, the operation information generation unit 70 displays information corresponding to the recording during the operation display unit 66, and the display indicator 38 corresponding to the recording is turned on in a predetermined state (step S202). Further, on the projected image, a message indicating that recording is in progress and the content of the recording (for example, information such as the recording start time and recording channel) are displayed in a superimposed manner (step S204).

  Next, the light source controller 86 stops the supply of power for driving the lamp 48 (step S206). Further, the corresponding display indicator 38 is lit in a predetermined state during lamp replacement (step S208).

  Subsequently, it is determined whether or not the lamp is replaced by the viewer (step S210). Specifically, the viewer's intention is confirmed by an operation by the operation instruction unit 72 or by pressing a predetermined lamp replacement button (not shown) arranged on the projection television 1. Here, when it is determined by the viewer that the lamp is not replaced (No in step S210), the series of processing ends. On the other hand, when it is determined that the lamp is to be replaced by the viewer (Yes in step S210), it waits for the lamp 48 to be replaced by the viewer (step S212). Note that the replacement of the lamp 48 is not limited to the manual replacement by the viewer, and a function of automatically replacing the lamp 48 may be provided in accordance with the viewer's instruction.

  Upon completion of the lamp replacement by the viewer, it is determined whether or not the lamp 48 is turned on by the viewer (step S214). This determination is also made by an operation by the operation instruction unit 72 within a predetermined time from the end of the lamp replacement, or by pressing a predetermined lamp lighting button (not shown) disposed on the projection television 1. Here, when the viewer determines that the lamp 48 is not turned on (No in step S214), the series of processing ends. On the other hand, if it is determined by the viewer that the lamp 48 is to be turned on (Yes in step S214), the display indicator 38 corresponding to the lamp being driven is turned on in a predetermined state (step S216), and a series of processing ends. To do.

According to the embodiment described above, the following effects can be obtained.
(1) When the intensity of the illumination light transitions from the region where the intensity does not exceed the specified value to the specified value or more, the program is separated by the step (step S118) of leaving to the viewer's judgment whether or not to end the recording. Since the recording can be extended to the location, usability is improved.
(2) Since the light source of the lamp 48 can be controlled independently by the light source control unit 86, safety when the lamp 48 is replaced can be ensured.

As mentioned above, although this invention was demonstrated based on embodiment shown in figure, this invention is not limited to this embodiment, The modification as described below can also be assumed.
(1) The determination of lamp burnout is not limited to a change in the voltage applied to the lamp 48, but may be determined from a change in the current flowing through the lamp 48, the intensity of light (illumination light) emitted from the lamp, or the like.
(2) When the main power supply of the projection television 1 is supplied and the viewing is terminated by the operation by the operation remote controller 42, the broadcast of the same channel as that at the time of viewing is recorded for a certain period of time from the time of the viewing termination instruction by the viewer. It may have such a function as possible. With such a function, when the viewer tries to start viewing again shortly after the end of viewing, the illumination light is broadcasted for a time (5 to 6 minutes) until the illumination light is restored to the specified intensity. Since the recorded program is also recorded, the contents broadcast during that period can be played back and viewed, improving usability.
(3) The display element that forms the optical image modulated by the image information is not limited to the liquid crystal light valve 50, but other transmissive liquid crystal display elements, reflective liquid crystal display elements, and micromirror light modulators. Non-light emitting type devices such as simple micromirror array elements may be used. Moreover, the present invention can be applied to a direct-view type display device having a light source as described in the embodiment in addition to an enlarged projection device such as the projection television 1.

The figure which shows the hardware constitutions of the projection television which concerns on embodiment of this invention. The figure which shows the function structure of the projection television which concerns on embodiment of this invention. The graph which shows the relationship between the time from the lighting start of a lamp | ramp, and the intensity | strength of the light beam inject | emitted from a light source part. The flowchart which shows the flow of a process in the projection television which concerns on embodiment of this invention. The flowchart which shows the flow of a lamp replacement process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Projection television, 10 ... CPU, 12 ... RAM, 14 ... ROM, 16 ... Input-output I / F, 18 ... Lamp control circuit, 20 ... Light intensity detection circuit, 22 ... Reception circuit, 24 ... Communication I / F, 26 ... Image memory, 28 ... Video decoder, 30 ... Video processor, 32 ... Light valve drive circuit, 34 ... Tuner, 36 ... Storage device, 38 ... Display indicator, 40 ... Light intensity sensor, 42 ... Operation remote control, 44 ... Communication Device ... 46 ... Bus 48 ... Lamp 50 ... Liquid crystal light valve 52 ... Projection lens 54 ... Broadcast receiving unit 56 ... AV signal processing unit 58 ... Image signal generating unit 60 ... Light intensity measuring unit 62 ... Output control unit, 64 ... AV signal output unit, 66 ... Operation display unit, 68 ... Video reproduction unit, 70 ... Operation information generation unit, 72 ... Operation instruction unit, 74 ... AV signal storage unit, 76 ... V signal transmission unit, 78 ... Lamp state detection unit, 80 ... Small information terminal, 82 ... Network, 86 ... Light source control unit, 90 ... Enlargement projection unit, 92 ... Light source unit, 94 ... Projection image generation unit, 96 ... Illumination optics system.

Claims (12)

A projection display device that forms an optical image by modulating a light beam according to image information obtained by receiving a broadcast, and projects and displays the formed optical image,
A receiver for receiving broadcasts;
A light source unit that emits a light beam by supplying power to the light emitting means;
A light intensity measuring unit for measuring the intensity of the light beam emitted from the light source unit;
An output unit for outputting an audio / video (AV) signal including at least a video signal;
When the power is supplied to the light emitting means, and the intensity of the light beam measured by the light intensity measuring unit does not exceed a certain value, a broadcast AV signal received by the receiving unit is output to the output unit. An output control unit for outputting to
A projection display device comprising: The projection display device according to claim 1,
The output control unit further includes:
The output of the AV signal by the output unit is terminated when the intensity of the light beam measured by the light intensity measuring unit transitions from a state where the light intensity does not exceed the constant value to a state where it exceeds a certain value. A projection display device characterized. The projection display device according to claim 1,
The light emitting means is replaceable,
And further comprising a detector for detecting a state where the light emitting means needs to be replaced,
The output control unit further includes:
A projection display apparatus, wherein the detection unit detects the state and causes the output unit to output a broadcast AV signal received by the receiving unit. The projection display device according to any one of claims 1 to 3,
A projection display device, further comprising a storage unit for storing the broadcast AV signal output from the output unit. The projection display device according to claim 4,
A projection display device further comprising an instruction unit for instructing at least an operation related to the storage. The projection display device according to any one of claims 4 to 5,
A projection display device, further comprising: a display unit that displays at least one of operation information relating to the storage and information relating to replacement of the light emitting means. The projection display device according to claim 6, wherein
The display unit displays the information to be displayed in a superimposed manner on a projected optical image. The projection display device according to any one of claims 4 to 7,
A projection display device, further comprising: a video reproduction unit that reproduces the AV signal stored in the storage unit. The projection display device according to any one of claims 1 to 8,
A projection display device, further comprising: a transmission unit that transmits the broadcast AV signal output from the output unit by communication. A projection television that is integrally provided with a transmissive screen and projects and displays received broadcast image information on the transmissive screen from the back,
A projection television comprising the projection display device according to claim 1. A control method for a projection display device that modulates a light beam emitted from a light source unit according to image information obtained by receiving a broadcast to form an optical image, and projects and displays the formed optical image. And
A light intensity measurement step for measuring the intensity of the light beam emitted from the light source unit;
An intensity determination step for determining whether or not the measured intensity of the light beam exceeds a certain value;
As a result of the determination, if the intensity of the luminous flux does not exceed the certain value,
Storing a received broadcast audio / video (AV) signal;
As a result of the determination, when the intensity of the light flux does not exceed the certain value, the state transitions to a state exceeding the certain value,
A storage operation ending step of ending the operation of storing the AV signal;
A control method for a projection display device, comprising: A control program for a projection display device that modulates a light beam emitted from a light source unit according to image information obtained by receiving a broadcast to form an optical image, and projects and displays the formed optical image. And
A light intensity measurement procedure for measuring the intensity of the light beam emitted from the light source unit;
An intensity determination procedure for determining whether or not the measured intensity of the light beam exceeds a certain value;
As a result of the determination, if the intensity of the luminous flux does not exceed the certain value,
A storage procedure for storing received broadcast audio / video (AV) signals;
As a result of the determination, when the intensity of the light flux does not exceed the certain value, the state transitions to a state exceeding the certain value
A storage operation end procedure for ending the operation of storing the AV signal;
A program for controlling a projection display apparatus, which causes a computer to execute.

Images