JP5408494B2 - Projector, projector light source initial drive voltage setting method, and projector light source drive voltage setting method - Google Patents

Description

  The present invention relates to a projector, a method for setting an initial driving voltage of a projector light source at the time of manufacturing the projector, and a method for setting a driving voltage of a projector light source after the projector is shipped.

  2. Description of the Related Art Today, data projectors are widely used as image projection apparatuses that project a screen of a personal computer, a video image, an image based on image data stored in a memory card or the like onto a screen. This projector focuses light emitted from a light source on a micromirror display element called DMD (digital micromirror device) or a liquid crystal plate, and displays a color image on a screen.

  Conventionally, projectors using a high-intensity discharge lamp as a light source have been the mainstream. However, in recent years, solid-state light-emitting elements (semiconductors) such as light-emitting diodes (LEDs), laser diodes (LD), or organic ELs have been used. There have been many developments and proposals of projectors using light emitting elements) as light sources.

  For example, Japanese Patent Laid-Open No. 2004-220015 (Patent Document 1) proposes a light source unit including a solid light emitting element as a light source, in which solid light emitting elements are arranged in a matrix in order to increase the amount of light.

  Japanese Patent Laying-Open No. 2004-341105 (Patent Document 2) proposes a light source unit including a fluorescent wheel in which a phosphor is laid in a circumferential direction and an ultraviolet light emitting diode as a solid light emitting element. . The light source unit in the proposal of Patent Document 2 is configured to irradiate the fluorescent wheel with ultraviolet light as excitation light from the back side, and use the emitted light emitted from the front side of the fluorescent wheel as light source light.

  Such a solid-state light emitting device may have a different driving voltage value depending on the solid used. When a plurality of solid state light emitting elements having different driving voltage values are connected in the projector, it is necessary to set the driving voltage value for each light emitting element in order to stably light each solid state light emitting element. As a method of setting the drive voltage value, information on the drive voltage value of the solid state light emitting element is sent to the DC-DC converter by an operational amplifier (operational amplifier), and the drive voltage value is variably controlled for each solid state light emitting element by the DC-DC converter. There is something to do.

  However, in a projector that needs to perform time-sharing control at high speed, if the drive voltage value is variably controlled by the DC-DC converter in accordance with the information from the operational amplifier in this way, a time lag occurs until stable lighting is achieved. End up. When the time lag occurs in this way, there is a problem that the light amount of the light source light emitted from the light source unit becomes uneven until stable lighting is achieved. As described above, when the amount of light of the light source is non-uniform, luminance unevenness occurs in a portion of the projected image.

  In addition, when a solid-state light emitting device that emits light in the red, green, and blue wavelength bands is used as the light source, the light emission efficiency and brightness differ depending on the solid light-emitting device of each color, so that the solid-state light emitting device of each color is controlled individually. There is a need to. Further, even in the same color and the same type of solid state light emitting element, a solid difference due to a manufacturing error or the like occurs in the light emission efficiency or luminance depending on the individual.

  In order to solve such a problem, in Japanese Patent Application Laid-Open No. 2004-311635 (Patent Document 3), information (characteristic information) necessary for stable driving of the solid state light emitting element is stored in advance, and driving of the solid state light emitting element is performed. In some cases, it has been proposed that the solid state light emitting device is stably lit at a high speed by being driven according to the characteristic information.

  In Japanese Patent Application Laid-Open No. 2005-310996 (Patent Document 4) and Japanese Patent Application Laid-Open No. 2008-171983 (Patent Document 5), in a light source unit in which a plurality of solid light-emitting elements are connected in series, each solid-state light-emitting element is individually provided. Proposals have been made to adjust the solid-state differences of the solid-state light emitting devices by providing load resistors and individually controlling the load resistors.

  Further, in Japanese Patent Application Laid-Open No. 2008-177020 (Patent Document 6), a plurality of solid state light emitting elements are arranged on a disk, and brightness unevenness is caused by rotating the disk including the plurality of light emitting elements. Proposals to prevent it have been made.

JP 2004-220015 A JP 2004-341105 A JP 2004-311635 A JP 2005-310996 A JP 2008-171983 A JP 2008-177020 A

  In a projector equipped with a light source unit that emits light of the three primary colors of red, green, and blue, it is necessary to make the luminance of each wavelength band light uniform, that is, to make the illuminance distribution uniform in the projected image . As described above, there is a method for controlling the drive voltage value applied to each solid-state light emitting element as a method for making the luminance of each wavelength band light uniform.

  However, for example, when a red light emitting diode, a green light emitting diode, or a blue light emitting diode is used as a light source, the luminance of the green wavelength band light is lower than that of red and blue, and the luminance is uniform by simply controlling the driving voltage. It was difficult to make it easier. Therefore, it is possible to make the luminance uniform by increasing the amount of green light emitting diodes with insufficient luminance (Patent Document 1).

  However, when the number of bright spots is increased, the etendue of the green light source (the value representing the spatial spread of the effective light as the product of the area and the solid angle) increases and becomes larger than the etendue of the display element. There is a problem that the utilization efficiency of light emitted from the diode is lowered.

  In addition, there is a method of irradiating the phosphor with excitation light and using the fluorescent light emitted from the phosphor as the light source light (Patent Document 2), but there is a problem that the luminance of the red wavelength band light is reduced. It was. Therefore, the emission light from the blue laser diode is irradiated to the fluorescent wheel having the green phosphor region that reflects and reflects the green wavelength band light and the diffuse transmission region that diffuses and transmits the excitation light. A light source unit that generates red wavelength band light by separately arranging a red light emitting diode has been developed.

  In this light source unit, the fluorescent light in the fluorescent wheel, the diffuse transmitted light, and the light emitted from the red light emitting diode are guided to the display element by different optical systems, so the driving voltage value of the red light emitting diode or blue laser diode It is difficult to prevent uneven brightness in the projected image by simply controlling the image. Even if the illuminance distribution is uniform at the beginning of use of the product, continuous use will cause red light emitting diodes, blue laser diodes, and phosphors to deteriorate over time, resulting in non-uniform illuminance distribution. There was also a problem that sometimes.

  The present invention has been made in view of the above-described problems of the prior art. In manufacturing a projector, each light source included in the light source unit of the projector is configured so that the white balance of the light source light output is uniform. Projector light source initial drive voltage setting method for setting drive voltage value to be applied, and projector for setting drive voltage value to be applied to each light source so as to maintain the white balance set by the initial drive voltage setting method after the projector is shipped Provided are a driving voltage setting method for a light source, and a projector capable of maintaining white balance at the time of product shipment even when used for a long period of time by setting a driving voltage value in a light source unit by these driving voltage setting methods. The purpose is to do.

  The present invention includes a light source unit capable of emitting light in the red, green, and blue wavelength bands, a display element, a light guide optical system that guides light emitted from the light source unit to the display element, and a projection side optical system And light source control information storage means, and projector control means having light source output control means for controlling the light source unit based on information stored in the light source control information storage means, wherein the light source unit is blue An excitation light irradiation device having a plurality of blue light sources for emitting wavelength band light, a fluorescent plate that receives emission light from the excitation light irradiation device and emits fluorescent light in the green wavelength band and diffused light in the blue wavelength band; A red light source that emits light in a red wavelength band, wherein the plurality of blue light sources are divided into a plurality of groups each including one or more blue light sources, and output control is performed for each group. The light source control information storage means includes drive voltage information for each group applied to the blue light source of each group when projecting the blue wavelength band light, and red applied to the red light source when the red wavelength band light is projected. Light source drive voltage information is stored, and the drive voltage information for each group includes a drive voltage value to be applied to the blue light source so that the illuminance distribution of the blue projection light matches or approximates the illuminance distribution of the red projection light. It is generated by adjusting each group.

  In the projector according to the aspect of the invention, the driving voltage information for each group may be blue when the plurality of blue light sources and the red light source are all turned on according to the driving voltage information stored in the light source control information storage unit. The illuminance distribution of the projected light and the illuminance distribution of the red projected light are compared at a predetermined number of measurement locations, and if there is a difference in illuminance at the measurement location, the illuminance distribution of the blue projection light at the measurement location is Measured for each group, and the illuminance of the blue projection light when the plurality of blue light sources are all turned on at the measurement location is mutually equal between the groups so that the illuminance of the blue projection light matches or approximates the illuminance of the red projection light. The information is set by the adjusted drive voltage value.

  Furthermore, the projector according to the present invention includes illuminance distribution measuring means for measuring the emission intensity and illuminance distribution of the light emitted from the light source unit, and the light source control information storage means is set before the projector is shipped. Initial light emission intensity information, which is initial information of light emission intensity of blue projection light and red projection light, obtained by sequentially turning on the all blue light source and the red light source in accordance with drive voltage information and sequentially measuring by the illuminance distribution measuring means. It is memorized.

  Further, the projector of the present invention is configured such that after the projector is shipped, the blue light and the red light obtained by sequentially turning on the all-blue light source and the red light source in accordance with the driving voltage information and sequentially measuring the illumination distribution measuring unit. A light emission intensity comparing means for comparing the measured light emission intensity information, which is the measured light intensity of the projection light, and the initial light emission intensity information; and the light source output control means includes the measured light emission intensity information and the initial light emission. It is determined whether or not there is a difference of a predetermined value or more between the intensity information and the emission intensity of the blue projection light and / or the red projection light, the emission intensity is different, and the measured emission intensity If there is a difference in the output balance between the blue projection light and the red projection light based on the information, the output balance between the blue projection light and the red projection light will match or approximate. In the adjusting the blue light source and / or the drive voltage value of the red light source, and wherein the driving voltage information after adjustment be stored in the source control information storage means.

  The light source control information storage means in the projector of the present invention is characterized in that information serving as a reference for an allowable range with respect to the approximate degree of the light emission intensity is stored in advance.

  And in the projector of the present invention, the light source output control means, the illuminance distribution of the blue projection light and the illuminance distribution of the red projection light when fully lit according to the drive voltage information stored in the light source control information storage means, Are compared at a predetermined number of measurement locations, and when there is a difference in illuminance at the measurement locations, the illuminance of the blue projection light when all the blue light sources are turned on is the illuminance of the red projection light. The drive voltage value applied to the blue light source is adjusted so as to match or approximate, and the adjusted drive voltage information is stored as drive voltage information in the light source control information storage means.

  Further, the light source control information storage means in the projector of the present invention is characterized in that information serving as a reference for an allowable range with respect to the approximate degree of the illuminance distribution is stored in advance.

  Further, the light source control information storage means in the projector of the present invention stores drive voltage information to be applied to each group of blue light sources when projecting green wavelength band light, and the drive voltage information for each group during the green projection is The illuminance distribution of green projection light and the illuminance distribution of red projection light when the plurality of blue light sources and red light source are all turned on according to the drive voltage information stored in the light source control information storage unit, respectively. In the case where there is a difference in illuminance at the measurement location, the illuminance distribution of the green projection light at the measurement location is measured for each group, and a plurality of blue light sources are provided at the measurement location. Driving mutually adjusted between the groups so that the illuminance of the green projection light when fully lit is equal to or close to the illuminance of the red projection light Be information set by pressure value.

  The present invention is an excitation light irradiation device comprising a plurality of blue light sources, a fluorescent plate that receives emission light from the excitation light irradiation device and emits green wavelength band fluorescent light and blue wavelength band diffused light, and A method of setting an initial driving voltage of a projector light source before shipment of a projector, comprising: a light source unit including a red light source that emits red wavelength band light; a projector control unit; and a light source control information storage unit, A plurality of blue light sources are divided into individually controllable groups, and the blue projection light when the plurality of blue light sources and the red light source are all lit in accordance with the drive voltage information stored in the light source control information storage means, respectively. When the illuminance distribution and the illuminance distribution of the red projection light are compared at a predetermined number of measurement locations, and there is a difference in illuminance at the measurement locations, The illuminance distribution of the blue projection light is measured for each of the groups, and the illuminance of the blue projection light when the plurality of blue light sources are all turned on at the measurement location is matched or approximated to the illuminance of the red projection light. Further, the present invention is realized by mutually adjusting the drive voltage value applied to the blue light source between the groups and storing the adjusted drive voltage value information in the light source control information storage means.

  In the method for setting the initial drive voltage of the projector light source according to the present invention, the drive voltage value applied to the blue light source is mutually changed between the groups so that the illuminance distribution of the blue projection light matches or approximates the illuminance distribution of the red projection light. The adjusted drive voltage value information is stored in the light source control information storage unit, and then the plurality of blue light sources are all turned on according to the drive voltage information stored in the light source control information storage unit. The illuminance distribution of the green projection light and the illuminance distribution of the red projection light in the case are also compared at a predetermined number of measurement points, and if there is a difference in illuminance at the measurement points, the illuminance of the green projection light at the measurement points The distribution is measured for each group, and the illuminance of the green projection light when the plurality of blue light sources are all turned on at the measurement location is the same as the illuminance of the red projection light. As approximated, the driving voltage value applied to the blue light source is mutually adjusted between the groups, and the adjusted driving voltage value information is stored in the light source control information storage means. And

  The present invention relates to an excitation light irradiating device in which a plurality of blue light sources are divided into a predetermined number of groups and output control is possible for each group. A light source unit comprising a fluorescent plate that emits diffused light in a blue wavelength band, and a red light source that emits red wavelength band light, and an illuminance distribution measuring unit that measures an illuminance distribution of the emitted light from the light source unit; Light source control information storage means storing information on the initial drive voltage value of the red light source and information on the initial drive voltage value of the blue light source for each group, and the light source unit according to the information stored in the light source control information storage means A projector control means having a light source output control means for controlling the projector light source drive voltage setting method in the projector, Before shipment, the initial information of the emission intensity of the blue projection light and the red projection light is obtained by sequentially turning on the all-blue light source and the red light source according to the initial drive voltage value and sequentially measuring by the illuminance distribution measuring means. The initial light emission intensity information is stored in the light source control information storage means to store certain initial light emission intensity information. After the projector is shipped, the all-blue light source and the red light source are sequentially turned on according to the drive voltage information, and the illuminance The measured emission intensity information, which is the measured information of emission intensity of the blue projection light and the red projection light, obtained by sequentially measuring with the distribution measuring means is compared with the initial emission intensity information, and the measured emission intensity information and the Whether or not a difference of a predetermined value or more is found in the emission intensity of the blue projection light and / or the red projection light with respect to the initial emission intensity information, and the previous There is a difference in emission intensity between the emission intensity comparison determination process for determining whether a difference is found in the output balance between the blue projection light and the red projection light from the measured emission intensity information, and the emission intensity determination process, and When there is a difference in the output balance between the blue projection light and the red projection light from the measured emission intensity information, the blue light source and the blue light source The driving voltage adjustment processing for adjusting the driving voltage value of the red light source and the driving voltage information update processing for storing the adjusted driving voltage information in the light source control information storage means are performed.

  In the projector light source drive voltage setting method according to the present invention, after the drive voltage adjustment process, the illuminance distribution of the blue projection light and the red projection light when all are turned on according to the drive voltage information stored in the light source control information storage means The illuminance distribution comparison determination process for comparing the illuminance distribution at a predetermined number of measurement locations, and when there is a difference in the illuminance at the measurement locations in the illuminance distribution comparison determination processing, the plurality of blue light sources are all turned on. Illuminance distribution adjustment processing for adjusting the drive voltage value applied to the blue light source for each group so that the illuminance of the blue projection light in this case matches or approximates the illuminance of the red projection light. The drive voltage information update process for storing the subsequent drive voltage information as drive voltage information in the light source control information storage means is performed.

  According to the present invention, at the time of manufacturing a projector, the initial drive voltage setting of the projector light source that sets the drive voltage value to be applied to each light source included in the light source unit of the projector so that the white balance of the light source light that is output becomes uniform A driving voltage setting method of a projector light source for setting a driving voltage value to be applied to each light source so as to maintain the white balance set by the initial driving voltage setting method after shipment of the projector, and these driving voltage setting methods. By setting the drive voltage value in the light source unit, it is possible to provide a projector capable of maintaining the white balance at the time of product shipment even when used for a long period of time.

1 is an external perspective view showing a projector according to an embodiment of the invention. It is a functional circuit block diagram of the projector which concerns on the Example of this invention. 1 is a schematic plan view showing an internal structure of a projector according to an embodiment of the invention. It is a front schematic diagram of the blue light source device excitation light irradiation device according to the embodiment of the present invention. It is a figure which shows the position of the measurement point of the illumination intensity distribution which concerns on the Example of this invention. It is a figure which shows the result of having measured the illumination intensity distribution of the red, green, and blue wavelength band light inject | emitted from the light source unit with which the projector which concerns on an Example of this invention is provided. It is a figure which shows the result of having measured the illumination intensity distribution for every group of the blue light source which concerns on the Example of this invention. It is a figure which shows an example of the drive voltage value applied to the light source set by the drive voltage setting method which concerns on the Example of this invention. It is a figure which shows the result of having measured the illuminance distribution of the red and blue wavelength band light inject | emitted from the light source unit at the time of controlling a light source unit with the drive voltage value set by the drive voltage setting method which concerns on the Example of this invention. It is a flowchart which shows the control flow of the drive voltage setting method which concerns on the Example of this invention. It is a figure which shows another example of the drive voltage value applied to the light source set by the drive voltage setting method which concerns on the Example of this invention.

  Hereinafter, modes for carrying out the present invention will be described. The projector 10 of the present invention includes a light source unit 60 that can emit light in the red, green, and blue wavelength bands, a display element 51, and a light guide optical system 170 that guides light emitted from the light source unit 60 to the display element 51. And a projection-side optical system 220. Further, the projector 10 includes a ROM as a light source control information storage means, and a projector control having a light source control circuit 41 as a light source output control means for controlling the light source unit 60 based on information stored in the light source control information storage means. Means.

  The light source unit 60 includes an excitation light irradiation device 70 having a plurality of blue light sources 71 that emit blue wavelength band light, and receives emission light from the excitation light irradiation device 70 to emit fluorescent light and blue wavelength band in the green wavelength band. And a red light source 121 that emits red wavelength band light. Further, the plurality of blue light sources 71 are divided into a plurality of groups each including a predetermined number of blue light sources 71, and output control can be performed for each group.

  The light source control information storage means includes drive voltage information for each group that is applied to the blue light source 71 of each group when projecting the blue wavelength band light, and a red light source drive that is applied to the red light source 121 when the red wavelength band light is projected. Voltage information is stored. The drive voltage information for each group is generated by adjusting the drive voltage value applied to the blue light source 71 for each group so that the illuminance distribution of the blue projection light approximates the illuminance distribution of the red projection light.

  That is, the drive voltage information for each group is the blue projection when the plurality of blue light sources 71 and red light sources 121 are all turned on according to the drive voltage information stored in the light source control information storage unit before the projector 10 is shipped. Compare the illuminance distribution of light and the illuminance distribution of red projection light at a predetermined number of measurement locations, and if there is a difference in illuminance at the measurement locations, measure the illuminance distribution of blue projection light for each group and measure , The information set by the drive voltage value mutually adjusted between the groups so that the illuminance of the blue projection light when the plurality of blue light sources 71 are all turned on matches or approximates the illuminance of the red projection light It is.

  In addition, the projector 10 of the present invention includes an illuminance distribution measurement sensor 44 as illuminance distribution measuring means for measuring the illuminance distribution of light emitted from the light source unit 60. The light source control information storage means sequentially turns on the all-blue light source 71 and the red light source 121 according to the set drive voltage information and sequentially measures them by the illuminance distribution measurement sensor 44. Initial light emission intensity information, which is information on the light emission intensity before product shipment, is stored at the stage before the projector 10 is shipped. The emission intensity is calculated from the illuminance distribution measured by the illuminance distribution measurement sensor 44.

  Further, the projector 10 of the present invention measures the emission intensity of the blue projection light and the red projection light obtained by sequentially turning on the all-blue light source 71 and the red light source 121 in accordance with the drive voltage information and sequentially measuring them by the illuminance distribution measurement sensor 44. There is a light emission intensity comparison means for comparing measured light emission intensity information, which is information, and initial blue light emission intensity information.

  Then, the light source control circuit 41 determines whether or not there is a difference in the emission intensity of the blue projection light and / or the red projection light between the actually measured emission intensity information and the initial emission intensity information, and the difference in the emission intensity. If there is an error in the overall output balance of the blue projection light and the red projection light, and if there is an error in the output balance, the overall output balance of the blue projection light and the red projection light is determined. Is adjusted or approximated to the initial output balance, and the drive voltage value of the blue light source 71 and / or the red light source 121 is adjusted, and the adjusted drive voltage information is stored in the light source control information storage means.

  Furthermore, after adjusting the output balance to match, compare the illuminance distribution of the blue projection light and the red projection light, and if the illuminance distribution is inconsistent, the drive voltage value applied to the blue light source 71 is shipped to the product. Similar to the previous setting of the drive voltage value, adjustment is made for each group.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an external perspective view of the projector 10. In this embodiment, left and right in the projector 10 indicate the left and right direction with respect to the projection direction, and front and rear indicate the screen side direction of the projector 10 and the front and rear direction with respect to the traveling direction of the light beam.

  As shown in FIG. 1, the projector 10 of the present embodiment has a substantially rectangular parallelepiped shape, and has a lens cover 19 that covers the projection port on the side of the front panel 12 that is a side plate in front of the projector housing, The front panel 12 is provided with a plurality of intake holes 18. Further, although not shown, an Ir receiver for receiving a control signal from the remote controller is provided.

  In addition, a key / indicator unit 37 is provided on the top panel 11 of the housing. The key / indicator unit 37 switches a power switch key, a power indicator for notifying power on / off, and switching on / off of projection. Keys and indicators such as an overheat indicator for notifying when a projection switch key, a light source unit, a display element, a control circuit, etc. are overheated are arranged.

  In addition, on the rear surface of the housing, there are provided various terminals 20 such as an input / output connector section and a power adapter plug that provide a USB terminal, a D-SUB terminal for image signal input, an S terminal, an RCA terminal, etc. on the rear panel. Yes. A plurality of intake holes 18 are formed in the back panel. A plurality of exhaust holes 17 are formed in each of the right panel, which is a side plate of the housing (not shown), and the left panel 15, which is the side plate shown in FIG. An intake hole 18 is also formed at a corner near the back panel of the left panel 15. Further, a plurality of intake holes or exhaust holes are also formed in the vicinity of the front, back, left and right panels of the lower panel (not shown).

  Next, projector control means of the projector 10 will be described with reference to the block diagram of FIG. The projector control means includes a control unit 38, an input / output interface 22, an image conversion unit 23, a display encoder 24, a display drive unit 26, and the like. Image signals of various standards input from the input / output connector unit 21 are input / output. The image conversion unit 23 converts the image signal into a predetermined format suitable for display via the interface 22 and the system bus (SB), and outputs the image signal to the display encoder 24.

  The display encoder 24 develops and stores the input image signal in the video RAM 25, generates a video signal from the stored contents of the video RAM 25, and outputs the video signal to the display drive unit 26.

  The display drive unit 26 functions as display element control means, and drives the display element 51, which is a spatial light modulation element (SOM), at an appropriate frame rate corresponding to the image signal output from the display encoder 24. By irradiating the light beam emitted from the light source unit 60 to the display element 51 through the light source side optical system, a light image is formed by the reflected light of the display element 51, and a projection side optical system 220 described later. An image is projected and displayed on a screen (not shown) via The movable lens group 235 of the projection side optical system 220 is driven by the lens motor 45 for zoom adjustment and focus adjustment.

  The image compression / decompression unit 31 performs a recording process in which the luminance signal and the color difference signal of the image signal are data-compressed by a process such as ADCT and Huffman coding, and sequentially written in a memory card 32 that is a detachable recording medium. Further, the image compression / decompression unit 31 reads the image data recorded on the memory card 32 in the reproduction mode, decompresses individual image data constituting a series of moving images in one frame group, and converts the image data into the image conversion unit 23. Is output to the display encoder 24 and the processing for enabling the display of a moving image or the like based on the image data stored in the memory card 32 is performed.

  The control unit 38 controls the operation of each circuit in the projector 10, and includes a CPU as a control means, a ROM in which operation programs such as various settings are fixedly stored, a RAM used as a work memory, and the like. It is comprised by. This ROM also functions as a light source control information storage means, and is a writable ROM such as an Elpida memory.

  An operation signal of a key / indicator unit 37 composed of a main key and an indicator provided on the upper panel 11 of the main body case is directly sent to the control unit 38, and a key operation signal from the remote controller is sent to the Ir receiving unit 35. , And the code signal demodulated by the Ir processor 36 is output to the controller 38.

  Note that an audio processing unit 47 is connected to the control unit 38 via a system bus (SB). The sound processing unit 47 includes a sound source circuit such as a PCM sound source, converts the sound data into analog in the projection mode and the playback mode, and drives the speaker 48 to emit loud sounds.

  Further, the control unit 38 controls a light source control circuit 41 as a light source control means, and the light source control circuit 41 is configured so that light of a predetermined wavelength band required at the time of image generation is emitted from the light source unit 60. The blue light source, red light source, and fluorescent wheel of the light source unit 60 are controlled.

  Further, the control unit 38 is connected to an illuminance distribution measuring sensor 44 as an illuminance distribution measuring means via a system bus (SB). The illuminance distribution measurement sensor 44 is disposed at a position where the OFF light of the display element 51 is irradiated. The illuminance distribution measurement sensor 44 measures the illuminance distribution in red, green, and blue wavelength band light from the OFF light of the display element 51, and displays the measurement result. The data is sent to the control unit 38 via the system bus (SB).

  In addition, the control unit 38 causes the cooling fan drive control circuit 43 to perform temperature detection using a plurality of temperature sensors provided in the light source unit 60 and the like, and controls the rotation speed of the cooling fan based on the temperature detection result. Further, the control unit 38 causes the cooling fan drive control circuit 43 to keep the cooling fan rotating even after the projector body is turned off by a timer or the like, or to turn off the projector body depending on the result of temperature detection by the temperature sensor. Control is also performed.

  Next, the internal structure of the projector 10 will be described. FIG. 3 is a schematic plan view showing the internal structure of the projector 10. As shown in FIG. 3, the projector 10 includes a control circuit board 241 in the vicinity of the right panel 14. The control circuit board 241 includes a power circuit block, a light source control block, and the like. In addition, the projector 10 includes a light source unit 60 on the side of the control circuit board 241, that is, at a substantially central portion of the projector housing.

  Further, the projector 10 includes an optical system unit 160 between the light source unit 60 and the left panel 15. A main control circuit board including a CPU (not shown) is disposed above the light source unit 60 and the optical system unit 160, that is, between the light source unit 60 and the optical system unit 160 and the upper panel 11. .

  The light source unit 60 includes an excitation light irradiation device 70 disposed in the vicinity of the rear panel 13 at a substantially central portion in the left-right direction of the projector housing, and an optical axis of a light beam emitted from the excitation light irradiation device 70. The fluorescent light emitting device 100 disposed near the front panel 12, the red light source device 120 disposed between the excitation light irradiation device 70 and the fluorescent light emitting device 100, and the emission light and red color from the fluorescent light emitting device 100 A light source side optical system 140 that converts the optical axis of the light emitted from the light source device 120 so as to be the same optical axis.

  The excitation light irradiation device 70 includes a blue light source device 72 arranged so that the optical axis is parallel to the back panel 13, and a reflection mirror that converts the optical axis of light emitted from the blue light source device 72 by 90 degrees in the direction of the front panel 12. A condensing lens 78 that condenses the light emitted from the blue light source device 72 reflected by the reflecting mirror group 75, and a heat sink 81 is disposed between the blue light source device 72 and the right panel 14. ing.

  The blue light source device 72 includes a plurality of blue light sources 71 that are solid light emitting elements such as blue laser diodes arranged in a matrix. Specifically, 24 blue light sources 71 are arranged in three stages in the vertical direction. It is arranged in eight directions in the direction and at equal intervals. A collimator lens 73 for converting the light emitted from each blue light source 71 into parallel light is disposed on the optical axis of the light emitted from each blue light source 71. Further, the reflecting mirror group 75 is formed by arranging a plurality of reflecting mirrors in a stepped manner, and reduces the cross-sectional area of the light beam emitted from the blue light source device 72 in one direction, that is, in the left-right direction in FIG. The light is emitted to the condenser lens 78.

  A cooling fan 261 is disposed between the heat sink 81 of the excitation light irradiation device 70 and the back panel 13, and the blue light source 71 is cooled by the cooling fan 261 and the heat sink 81. Further, a cooling fan 261 is also disposed between the reflection mirror group 75 and the back panel 13, and the reflection mirror group 75 and the condenser lens 78 are cooled by the cooling fan 261.

  The fluorescent light emitting device 100 includes a fluorescent wheel 101 as a fluorescent plate arranged in parallel with the front panel 12, that is, orthogonal to the optical axis of the light emitted from the excitation light irradiation device 70, and the fluorescent wheel 101 A wheel motor 110 that rotates and rotates, a condensing lens group 111 that collects light bundles emitted from the fluorescent wheel 101 toward the rear panel 13, and a light bundle emitted from the fluorescent wheel 101 toward the front panel 12 A condensing lens 115 that emits light.

  The fluorescent wheel 101 includes a green fluorescent light emitting region that emits fluorescent light in the green wavelength band using the light emitted from the excitation light irradiation device 70 as excitation light, and a diffuse transmission region that diffuses and transmits the light emitted from the excitation light irradiation device 70 And are arranged side by side in the circumferential direction. Further, the surface on the back panel 13 side of the fluorescent wheel 101 in the green fluorescent light emitting region is mirror-processed by silver vapor deposition or the like, and a band-shaped green phosphor layer is laid on the mirror-processed surface. Further, fine irregularities are formed on the surface of the fluorescent wheel 101 in the diffuse transmission region by sandblasting or the like.

  The light emitted from the excitation light irradiating device 70 applied to the green phosphor layer of the fluorescent wheel 101 excites the green phosphor in the green phosphor layer, and the light bundle is emitted in all directions from the green phosphor. Is reflected directly to the rear panel 13 side or after being reflected by the surface of the fluorescent wheel 101 and then emitted to the rear panel 13 side and enters the condenser lens group 111. In addition, the light emitted from the excitation light irradiating device 70 irradiated to the diffuse transmission region of the fluorescent wheel 101 is incident on the condenser lens 115 as diffuse transmitted light in the blue wavelength band diffused by the fine unevenness. A cooling fan 261 is disposed between the wheel motor 110 and the front panel 12, and the fluorescent wheel 101 is cooled by the cooling fan 261.

  The red light source device 120 includes a red light source 121 arranged so that the optical axis is parallel to the blue light source 71, and a condensing lens group 125 that condenses the light emitted from the red light source 121. The red light source device 120 is disposed so that the optical axis intersects the light emitted from the excitation light irradiation device 70 and the green wavelength band light emitted from the fluorescent wheel 101. The red light source 121 is a solid light emitting element such as a red light emitting diode. Furthermore, the red light source device 120 includes a heat sink 130 disposed on the right panel 14 side of the red light source 121. A cooling fan 261 is disposed between the heat sink 130 and the front panel 12, and the red light source 121 is cooled by the cooling fan 261.

  The light source side optical system 140 includes a condenser lens that condenses the light bundles in the red, green, and blue wavelength bands, and a reflection mirror that converts the optical axes of the light bundles in the respective color wavelength bands into the same optical axis, It consists of a dichroic mirror. Specifically, a position where the blue wavelength band light emitted from the excitation light irradiation device 70 and the green wavelength band light emitted from the fluorescent wheel 101 intersect with the red wavelength band light emitted from the red light source device 120. In addition, a first dichroic mirror 141 that transmits blue and red wavelength band light, reflects green wavelength band light, and converts the optical axis of the green light by 90 degrees toward the left panel 15 is disposed.

  Also, on the optical axis of the blue wavelength band light diffusely transmitted through the fluorescent wheel 101, that is, between the condenser lens 115 and the front panel 12, the blue wavelength band light is reflected and the optical axis of this blue light is on the left side. A first reflecting mirror 143 that converts 90 degrees in the direction of the panel 15 is disposed. Further, on the optical axis of the blue wavelength band light reflected by the first reflection mirror 143 and in the vicinity of the optical system unit 160, a second reflection mirror for converting the optical axis of the blue light by 90 degrees in the direction of the back panel 13 145 is arranged.

  Further, the optical axis of the red wavelength band light transmitted through the first dichroic mirror 141, the optical axis of the green wavelength band light reflected by the first dichroic mirror 141 so as to coincide with this optical axis, and the second reflection mirror 145 At the position where the optical axis of the reflected blue wavelength band light intersects, the blue wavelength band light is transmitted, the red and green wavelength band light is reflected, and the optical axes of the red and green light are 90 degrees toward the rear panel 13. A second dichroic mirror 148 for changing the degree is arranged. A condensing lens is disposed between the dichroic mirror and the reflecting mirror. Further, a condensing lens 173 that condenses the light source light at the entrance of the light tunnel 175 is disposed near the entrance surface of the light tunnel 175.

  The optical system unit 160 includes an illumination side block 161 located on the left side of the excitation light irradiation device 70, an image generation block 165 located near a position where the back panel 13 and the left panel 15 intersect, and a light source side optical system. The projection-side block 168 located between the 140 and the left panel 15 is configured in a substantially U-shape.

  The illumination side block 161 includes a part of a light guide optical system 170 that guides the light source light emitted from the light source unit 60 to the display element 51 provided in the image generation block 165. As the light guide optical system 170 included in the illumination side block 161, the light tunnel 175 that uses the light flux emitted from the light source unit 60 as a light flux having a uniform intensity distribution, and the light emitted from the light tunnel 175 are collected. There are a condensing lens 178, an optical axis conversion mirror 181 that converts the optical axis of the light beam emitted from the light tunnel 175 in the direction of the image generation block 165, and the like.

  As the light guide optical system 170, the image generation block 165 has a condensing lens 183 that condenses the light source light reflected by the optical axis conversion mirror 181 on the display element 51, and a light beam transmitted through the condensing lens 183 as a display element. And an irradiation mirror 185 that irradiates 51 at a predetermined angle. Further, the image generation block 165 includes a DMD serving as the display element 51, and a heat sink 190 for cooling the display element 51 is disposed between the display element 51 and the rear panel 13. Element 51 is cooled. Further, a condensing lens 195 as the projection-side optical system 220 is disposed in the vicinity of the front surface of the display element 51.

  Further, the above-described illuminance distribution measurement sensor 44 (not shown in FIG. 3) is disposed at a position where the OFF light from the display element 51 is irradiated in the image generation block 165. The illuminance distribution measurement sensor 44 measures the illuminance distribution of the red, green, and blue projection light by receiving the OFF light from the display element 51. The arrangement position of the illuminance distribution measurement sensor 44 is not limited to the image generation block 165, and may be any position where the illuminance distribution can be measured.

  The projection-side block 168 has a lens group of the projection-side optical system 220 that emits ON light reflected by the display element 51 to the screen. The projection-side optical system 220 includes a fixed lens group 225 built in a fixed lens barrel and a movable lens group 235 built in a movable lens barrel, and is a variable focus lens having a zoom function, and is movable by a lens motor. Zoom adjustment and focus adjustment can be performed by moving the lens group 235.

  In the projector 10 having such a configuration, in order to project a high-quality image, it is required to make the illuminance distribution of the projection light in the red, green, and blue wavelength bands uniform. That is, when white light is projected, it is necessary to prevent luminance unevenness from occurring in the projected image.

  In the light source unit 60 of the present embodiment, the red projection light is generated by lighting a single red light emitting diode that is the red light source 121. Therefore, the luminance of the red projection light can be changed by adjusting the output of the red light source 121, but the illuminance distribution of the red projection light cannot be changed. Therefore, in order to make the white balance of the projection image uniform, it is necessary to approximate the illuminance distributions of the blue and green projection lights to the illuminance distribution of the red projection light.

  Hereinafter, the initial drive voltage setting method of the blue light source 71 and the red light source 121 in the projector 10 of the present embodiment, that is, the drive voltage value of the blue light source 71 and the red light source 121 when the projector 10 is manufactured (before the projector 10 is shipped). A method of setting is described. FIG. 4 is a schematic front view of the blue light source device 72.

  In the blue light source device 72 of this embodiment, as shown in FIG. 4, 24 blue light sources 71 arranged in three stages in the vertical direction and eight levels in the front-rear direction are divided into three stages in the vertical direction and two in the front-rear direction. The group is divided into four groups of six blue light sources 71, and the output control of the blue light sources 71 is possible for each group. The illuminance distribution of the red projection light when the red light source 121 is lit with a predetermined drive voltage value, and the illuminance distribution of the blue projection light when the blue light source 71 is lit with a drive voltage value set for each group , The output for each group is adjusted so that the illuminance distribution is substantially uniform. The predetermined drive voltage value is a drive voltage value equal to or less than the maximum forward voltage value of the blue light source 71 or the red light source 121, and is stored in advance as drive voltage information in a ROM serving as a light source control information storage unit. The drive voltage value.

  Specifically, first, each group of the blue light sources 71 is turned on with a predetermined drive voltage value, and the illuminance distribution of the blue and green projection light is measured. At the same time, the red light source 121 is turned on at a predetermined drive voltage value, and the illuminance distribution of the red projection light is measured. When measuring the illuminance distribution, as shown in FIG. 5, the projection light projected on a screen or the like is divided into nine parts by dividing the light into three parts vertically and horizontally, and the average value of the illuminance in the nine areas is calculated as illuminance. This is done by measuring with a meter. In FIG. 5, each measurement point is color-coded, but the projection image is not displayed, but is color-coded only to clarify each region.

  In the following specification, the measurement point 1 indicates the upper left when the screen on which the image is projected is viewed from the front, the measurement point 2 is the upper center, the measurement point 3 is the upper right, and the middle in the following order. The left, center, and right, and the lower, left, center, and right are described as measurement points 4, 5, 6, 7, 8, and 9. In this embodiment, the illuminance is measured at nine points on the projected image. However, the measurement points are not limited to the number of measurement points or the measurement points. The accuracy can be further increased by increasing the number of points, the adjustment can be facilitated by reducing the number of measurement points, or the position of the measurement point can be changed.

  Then, after measuring the illuminance distribution of the blue, green, and red projection light, the measured illuminance distribution of each color light is compared. FIG. 6 shows the result of measuring the illuminance distribution of blue and green projection light when the blue light sources 71 belonging to each group of the blue light source device 72 are turned on with a predetermined drive voltage value, and the red light source 121 with a predetermined drive voltage value. It is a figure showing the illuminance distribution measurement result of the red projection light at the time of making it light by.

  First, comparing the illuminance distributions of the blue projection light and the red projection light, as shown in FIG. 6, the illuminance distribution of the blue projection light is compared with the illuminance distribution of the red projection light at all measurement points (lx: Lux) is high, and the difference is particularly remarkable at the upper stage of the measurement points 1 to 3. On the other hand, comparing the illuminance distributions of the green projection light and the red projection light, it can be seen that the illuminance distribution of the green projection light is high at all measurement points, but approximates to the illuminance distribution of the red projection light.

  In addition, the difference in illuminance between the high and low illuminance measurement points in the red and green projection lights is relatively small, whereas the blue projection light is in the high and low illuminance measurement points. The difference in illumination tends to be large. This is because the red projection light is emitted from a single red light source 121, and there is no influence of illuminance variation due to individual differences of the light source elements, and the green projection light is emitted from the blue light source device 72 as a light fluorescent wheel. In order to excite and diffuse in the 101 green phosphor layer, the illuminance variation due to individual differences of multiple light source elements of the blue light source device 72 is reduced, while the blue projection light directly emits the light emitted from the blue light source device 72. This is because it is diffused in the diffusive transmission region of the fluorescent wheel 101, and the illuminance variation due to the individual difference is likely to occur from the plurality of light source elements of the blue light source device 72.

  Therefore, in order to make the white balance uniform, it is necessary to reduce the output of the group of blue light sources 71 having a strong influence on the measurement points 1 to 3 so that the illuminance distribution of the blue projection light approximates the illuminance distribution of the red projection light. is there. In the light source unit 60 of the present embodiment, the light source light in the blue wavelength band is generated by diffusing and transmitting the emitted light from the plurality of blue light sources 71 through the fluorescent wheel 101. Therefore, it is necessary to investigate which group of blue light sources 71 needs to be adjusted. Therefore, in order to examine which part of the screen the light bundle emitted from the blue light source 71 of each group has a particular influence, the blue light source 71 is turned on for each group and each illuminance distribution is measured.

  FIG. 7 is a diagram illustrating an illuminance distribution measurement result of blue projection light emitted from each group when the blue light source 71 is turned on with a predetermined drive voltage value for each group. As shown in FIG. 7, the emitted light from the group 1 is strongly irradiated to the measurement points 1, 4 and 7, that is, the left portion on the screen. Moreover, the emitted light from the group 2 is strongly irradiated to the measurement points 2, 5, and 8, and also affects the measurement points 1, 4, and 7. That is, the light emitted from the group 2 is strongly irradiated on the central portion on the screen but is also relatively strongly irradiated on the left side portion.

  Further, the emitted light from the group 3 is strongly irradiated to the measurement points 2, 5, and 8, and is also irradiated to the measurement points 3 and 6 more strongly. That is, the light emitted from the group 3 is strongly irradiated on the central portion on the screen but is also relatively strongly irradiated on the right side portion. Moreover, the emitted light from the group 4 is strongly irradiated to the measurement points 3, 6 and 9, that is, the right part on the screen is strongly irradiated.

  From the illuminance distribution for each group of blue projection light shown in FIG. 7, among the measurement points 1 to 3 that need to be adjusted, the measurement point 1 has the strongest influence on the blue light source belonging to group 1 71, it can be seen that the measurement points 2 and 3 are affected by the groups 2 to 4. Therefore, when projecting blue wavelength band light, the drive voltage value of the blue light source 71 belonging to group 1 is greatly lowered as shown in FIG. 8 in order to approximate the illuminance distribution of the blue projection light to the illuminance distribution of the red projection light. 50%, the driving voltage value of the blue light source 71 belonging to group 2 is 100%, the driving voltage value of the blue light source 71 belonging to group 3 is slightly lowered to 80%, and the driving voltage value of the blue light source 71 belonging to group 4 is reduced. Lower the value slightly to 90%. Each drive voltage value represents a percentage with respect to the predetermined drive voltage value described above.

  FIG. 9 shows the illuminance measurement result for each group of blue projection light when the blue light source 71 is turned on according to the drive voltage values shown in FIG. 8, the illuminance measurement results for all groups, and the red light source with a predetermined drive voltage value. It is a figure which shows the illumination intensity measurement result of the red projection light when 121 is turned on. When the blue light source 71 is turned on according to the drive voltage value shown in FIG. 8, as shown in FIG. 9, the total illuminance value of the projection light from the blue light source 71 belonging to each group is represented by the illuminance distribution of the red projection light. It can be seen that they are approximate.

  Note that, for example, even when the difference in illuminance distribution between the red projection light and the blue projection light appears remarkably only at one measurement point, it is preferable to adjust the drive voltage values of a plurality of groups. This is because when the driving voltage value of only one group is changed greatly, a difference from the illuminance of the red projection light occurs at other measurement points. That is, in the drive voltage setting method of this embodiment, the drive voltage values of a plurality of groups are adjusted in order to bring the illuminance distribution of the blue projection light closer to the illuminance distribution of the red projection light.

  Then, the information on the drive voltage value applied to the blue light source 71 for each group adjusted in this way and the information on the drive voltage value applied to the red light source 121 described above are fed back to the control unit 38, and the light source control information storage means Is stored as drive voltage information in the ROM.

  Next, after setting the drive voltage value to be applied to each of the light sources 71 and 121 in this way, the blue light source 71 and the red light source 121 for each group are sequentially turned on according to the set drive voltage information, and the illuminance distribution measuring sensor 44 described above turns the blue light source 71 on. The emission intensity of the projection light and the red projection light is sequentially measured, and the measured emission intensity is stored in the light source control information storage unit as initial emission intensity information.

  In this way, the drive voltage values of the blue light source 71 and the red light source 121 are set by the initial drive voltage setting method and stored in the ROM as the light source control information storage means, so that the CPU as the projector control means stores the light source control information. By reading out these pieces of information stored in the ROM as means and controlling the light source control circuit 41 in accordance with these pieces of information, it is possible to project a projection image with uniform luminance distribution without uneven brightness.

  Next, a method for setting the driving voltage of the projector light source after the projector 10 is shipped will be described. The projector 10 according to the present embodiment, in which the driving voltage value is set according to the initial driving voltage setting method as described above, can control the blue light source 71 in accordance with each information stored in the light source control information storage unit, thereby causing a color image without luminance unevenness. Can be projected.

  However, the solid-state light emitting devices used as the blue light source 71 and the red light source 121 may decrease in luminance due to aging degradation or the like due to continuous use as described above, and there are individual differences in terms of the deterioration rate. Therefore, even if the blue light source 71 is turned on in accordance with the drive voltage value set before shipment due to individual differences in the deterioration rate, uneven brightness may occur in the projected image. Therefore, in order to project a color image with no luminance unevenness, it is necessary to reset the drive voltage values of the light sources 71 and 121 even after shipment.

  The projector 10 in this embodiment has a projector light source driving voltage setting method after shipment. This driving voltage setting method measures the emission intensity of blue projection light and red projection light emitted from the blue light source device 72 and the red light source 121, and there is a difference between the initial emission intensity and the actually measured emission intensity, and When the output balance is out of order, the process of adjusting the drive voltage value and the illuminance distribution of the blue and red projection lights are measured. If there is a difference between the illuminance distributions, the illuminance distributions match. Alternatively, white balance is maintained by performing a process of adjusting the drive voltage value applied to the blue light source 71 for each group so as to approximate.

  Details will be described below. FIG. 10 is a flowchart showing a driving voltage setting method for the projector light source after product shipment. When the projector 10 is turned on, the light source control circuit 41 as the light source output control means turns on the blue light source 71 and the red light source 121 according to the initial drive voltage information stored in the light source control information storage means (ROM). A lighting process (step S205) is performed. Next, the light source control circuit 41 causes the illuminance distribution measurement sensor 44 as the illuminance distribution measurement means to measure the illuminance distribution of the blue projection light and the red projection light from the all-blue light source 71, and calculates the emission intensity from each illuminance. A light emission intensity measurement process (step S210) is performed.

  Next, the light source control circuit 41 compares the measured light emission intensity measured in the light emission intensity measurement process (step S210) with the initial light emission intensity stored in the light source control information storage means, so that the respective light emission intensities match or A light emission intensity comparison / determination process (step S215) is performed to determine whether to approximate. The approximation of the light emission intensity at this time is a predetermined range that does not significantly affect the illuminance of the projected image, and is stored in advance in the light source control information storage unit as an allowable range. That is, the light source control circuit 41 functions as a light emission intensity comparison unit that compares the initial light emission intensity with the actual light emission intensity measured by the illuminance distribution measurement sensor 44.

  In the light emission intensity comparison determination process (step S215), when the actual light emission intensity obtained by measurement and the initial light emission intensity match or approximate, the light source control circuit 41 determines that the illuminance distribution of the red projection light and the blue projection light is An illuminance distribution comparison determination process (step S235) is performed to determine whether they match or approximate.

  In the light emission intensity comparison / determination process (step S215), when the measured light emission intensity and the initial light emission intensity do not match or approximate, the light source control circuit 41 determines the mutual output balance of the red and blue projection lights in the initial light emission intensity information, The output balance determination process (step S220) for comparing each output balance obtained by the measurement and determining whether each output balance matches or approximates is performed. The degree of approximation of the output balance at this time is a predetermined range that does not significantly affect the white balance of the projected image, and is preliminarily stored in the light source control information storage unit as an allowable range.

  In this way, when there is a difference from the initial light emission intensity of any one of the light sources, the output balance is determined if the initial output balance and the output balance by measurement match or approximate. This is because although the luminance is reduced due to deterioration over time, the white balance is maintained, so that the quality of the projected image is not deteriorated due to uneven luminance.

  In the output balance determination process (step S220), when the output balance in the measurement result matches or approximates the initial output balance, the light source control circuit 41 executes the illuminance distribution comparison determination process (step S235).

  On the other hand, in the output balance determination process (step S220), when there is a difference between the output balance obtained by measurement and the initial output balance, the light source control circuit 41 determines whether the output balance obtained by measurement and the initial output balance are different. A drive voltage adjustment process (step S225) for adjusting the drive voltage values of the blue light source 71 and the red light source 121 for each group is performed so as to match or approximate. That is, the light source control circuit 41 adjusts the drive voltage value applied to each of the light sources 71 and 121 so that the measured output balance matches or approximates the initial output balance. Then, after the drive voltage adjustment process (step S225), the light source control circuit 41 performs an illuminance distribution measurement process (step S230) by the illuminance distribution measurement sensor 44.

  In this drive voltage adjustment process (step S225), when it is confirmed in the output determination process (step S215) that the blue light source 71 has deteriorated, the drive voltage value applied to the all blue light sources 71 is increased, or the red light source 71 Adjustment is performed to reduce the drive voltage value applied to the light source 121. If it is confirmed that the red light source 121 has deteriorated, adjustment is performed such that the drive voltage value applied to the all-blue light source 71 is decreased or the drive voltage value applied to the red light source 121 is increased.

  After the illuminance distribution measurement process (step 230), the light source control circuit 41 executes an illuminance distribution comparison determination process (step S235). The degree of approximation in this illuminance distribution comparison determination process (step S235) is a predetermined range that does not significantly affect the illuminance of the projected image, and is preliminarily defined in the light source control information storage means as an allowable range. .

  In the illuminance distribution comparison determination process (step S235), when the illuminance distributions match or approximate, the light source control circuit 41 adjusts when the drive voltage value is adjusted in the drive voltage adjustment process (step S225). The drive voltage update process (step S245) for saving the subsequent drive voltage value in the light source control information storage means and updating the drive voltage information is performed, and normal driving of the projector 10 is started.

  In the illuminance distribution comparison determination process (step S235), when there is a difference between the illuminance distributions, the light source control circuit 41 determines whether the illuminance distribution of the blue projection light matches or approximates the illuminance distribution of the red projection light. The illuminance distribution adjustment process (step S240) for adjusting the drive voltage value applied to the blue light source 71 is executed, the drive voltage update process (step S245) is performed, and then normal driving of the projector 10 is started.

  The adjustment method of the drive voltage value in the illuminance distribution adjustment process (step S240) is the same as the above-described initial drive voltage adjustment method, and the light source control circuit 41 as the light source output control means stores it in the light source control information storage means. When the illuminance distribution of the blue projection light and the illuminance distribution of the red projection light when the light sources 71 and 121 are turned on according to the driving voltage information are compared at a predetermined number of measurement points, and there is a difference in illuminance at the measurement points Adjusts the drive voltage value applied to the blue light source 71 for each group so that the illuminance of the blue projection light when the plurality of blue light sources 71 are all turned on matches or approximates the illuminance of the red projection light, The adjusted drive voltage information is stored as drive voltage information in the light source control information storage means.

  Thus, when the projector 10 is turned on, always measure the emission intensity of each light source 71, 121, and if a difference between the initial emission intensity and the actual emission intensity is found, adjust the drive voltage value, If the illuminance distribution of the red projection light and the blue projection light does not match or approximate even after adjustment, the white balance is always maintained by adjusting the drive voltage value applied to the blue light source 71 for each group. The projector 10 capable of projecting a quality image can be provided.

  The projector 10 of the present embodiment is configured to divide a plurality of blue light sources 71 of the blue light source device 72 into a plurality of individually controllable groups and set a drive voltage value for each group. Thus, according to the projector 10 of the present embodiment, when luminance unevenness occurs in the projected image, the luminance unevenness is corrected by controlling the output of the blue light source 71 belonging to the group corresponding to the region where the luminance unevenness has occurred. can do. In addition, by setting the output for each group, even if there is an individual difference in the aging of the solid state light emitting element used, the difference as a whole group is small, so that stable projection for a long time. A possible projector 10 can be provided.

  Further, in the projector 10 of the present embodiment, when the output of the solid state light emitting element in the light source unit 60 is set before the projector 10 is shipped, the light emitted from the blue light source 71 of each group affects which part on the screen. Based on this information, the drive voltage value applied to each group of blue light sources 71 is adjusted. By adjusting the drive voltage value in this way, it is possible to easily identify the position that is different from the illuminance distribution of the red projection light and easily adjust the output of the portion that is different from the illuminance distribution of the red projection light. It is possible to prevent luminance unevenness from occurring at a predetermined location on the image.

  Then, an illuminance distribution measurement sensor 44 is provided to measure the initial emission intensity of the red projection light and each group or blue projection light when fully lit, and store the initial emission intensity information in the light source control information storage means. Thus, when the solid light emitting element is deteriorated by continuous use, the driving voltage value of the solid light emitting element can be adjusted based on the output balance in the initial light emission intensity information.

  Further, when the output balance is set in the projector 10 in which the solid-state light emitting element has deteriorated after shipment, the blue light source 71 and the red light source 121 are driven so as to match or approximate the output balance of the initial light emission intensity information. With the configuration in which the voltage value is adjusted, it is possible to provide the projector 10 that can maintain the initial white balance for a long period of time.

  Furthermore, by using a configuration that can make the illuminance distribution of each color projection light uniform based on the illuminance distribution information measured by the illuminance distribution measurement sensor 44, a predetermined group of the blue light sources 71 is deteriorated and the initial drive is performed. Even when the white balance cannot be maintained with the voltage value, the drive voltage value can be automatically adjusted for each group, and thus the projector 10 capable of projecting a high-quality image for a long period of time can be provided. Further, for example, even when the initial drive voltage information is erased for some reason, the white balance can be automatically adjusted, and the user-friendly projector 10 can be provided.

  In addition, by previously storing information that serves as a reference for the allowable range with respect to the approximation of the light emission intensity and the illuminance distribution in the light source control information storage means, the drive voltage value applied to each of the light sources 71 and 121 can be automatically adjusted. Therefore, it is possible to provide the projector 10 capable of projecting a high-quality image without bothering the user of the projector 10.

  In the embodiment described above, the output of the blue light source 71 is controlled for each group only when the blue wavelength band light is projected. However, as shown in FIG. 11, the blue light source 71 is also projected when the green wavelength band light is projected. Can also be configured to control output for each group. That is, if there is a difference between the illuminance distribution of the green projection light and the illuminance distribution of the red projection light, the illuminance distribution of the blue light source 71 belonging to each group is grouped as in the case of adjusting the illuminance distribution of the blue projection light described above. The drive voltage value to be applied to the group of the plurality of blue light sources 71 is adjusted so that the illuminance at the measurement point where the difference occurs is close to the illuminance of the red projection light. Then, the adjusted drive voltage information is fed back and stored in the light source control information storage means as information relating to the output of the blue light source 71 for each group during green projection.

  As described above, with respect to the green projection light, the driving voltage value is adjusted for each group of the blue light sources 71, so that even when there is a difference in the illuminance distribution between the red projection light and the green projection light, the green projection light can be driven easily. The voltage value can be set, and the projector 10 capable of projecting a high-quality color image can be provided.

  The blue light source device 72 in the present embodiment is described in which the blue light sources 71 are arranged so that there are three stages in the up-down direction and eight stages in the front-rear direction, but is not limited thereto. If the output control is performed for a plurality of blue light sources 71 for each group, the same effect can be obtained in any number of blue light sources 71 and any arrangement of blue light sources 71.

  In the present embodiment, the blue light source device 72 is composed of six blue light sources 71 to form one group. However, the number of blue light sources 71 constituting one group is not limited to this. For example, One group may constitute one group. That is, it is only necessary that the blue light sources 71 included in the blue light source device 72 can be divided into two or more groups. Furthermore, the number of blue light sources 71 constituting each group may be different from each other. However, in this case, the influence of illuminance on each measurement point on the screen for each group naturally changes depending on the number of blue light sources 71 configured for each group. Needless to say, the adjustment needs to take into account not only the positional relationship of the group with respect to the projection image but also the number of blue light sources 71 constituting the group.

  Further, the drive voltage value applied to the blue light source 71 at the time of projecting the green and blue wavelength band lights shown in FIGS. 8 and 11 is merely an example, and is not limited to this value. . That is, the projector light source drive voltage setting method in this embodiment is characterized in that the blue light source 71 is divided into groups that can be individually controlled, and output adjustment and output control are performed for each group.

  The present invention is not limited to the above embodiments, and can be freely changed and improved without departing from the gist of the invention.

10 Projector 11 Top panel
12 Front panel 13 Back panel
14 Right panel 15 Left panel
17 Exhaust hole 18 Intake hole
19 Lens cover 20 Various terminals
21 I / O connector 22 I / O interface
23 Image converter 24 Display encoder
25 Video RAM 26 Display driver
31 Image compression / decompression unit 32 Memory card
35 Ir receiver 36 Ir processor
37 Key / Indicator section 38 Control section
41 Light source control circuit 43 Cooling fan drive control circuit
44 Illuminance distribution measurement sensor 45 Lens motor
47 Audio processor 48 Speaker
51 Display element 60 Light source unit
70 Excitation light irradiation device 71 Blue light source
72 Blue light source device 73 Collimator lens
75 Reflective mirror group 78 Condensing lens
81 heat sink
100 Fluorescent light emitting device 101 Fluorescent wheel
110 Wheel motor 111 Condensing lens group
115 Condenser lens 120 Red light source device
121 Red light source 125 Condensing lens group
130 Heat sink 140 Light source side optical system
141 First dichroic mirror 143 First reflection mirror
145 Second reflection mirror 148 Second dichroic mirror
160 Optical unit 161 Illumination side block
165 Image generation block 168 Projection side block
170 Light guiding optics 173 Condensing lens
175 Light tunnel 178 Condensing lens
181 Optical axis conversion mirror 183 Condensing lens
185 Irradiation mirror 190 Heat sink
195 Condensing lens 220 Projection side optical system
225 Fixed lens group 235 Movable lens group
241 Control circuit board 261 Cooling fan

Claims (12)

A light source unit capable of emitting light in the red, green, and blue wavelength bands, a display element, a light guide optical system that guides light emitted from the light source unit to the display element, a projection side optical system, and a light source control Information storage means and projector control means having light source output control means for controlling the light source unit based on information stored in the light source control information storage means, wherein the light source unit emits blue wavelength band light. Excitation light irradiation device having a plurality of blue light sources to be emitted, a fluorescent plate that receives emission light from the excitation light irradiation device and emits fluorescent light in the green wavelength band and diffused light in the blue wavelength band, and red wavelength band light A projector comprising: a red light source that emits light;
The plurality of blue light sources are divided into a plurality of groups each including one or more blue light sources, and output control is possible for each group.
The light source control information storage means includes drive voltage information for each group that is applied to the blue light source of each group when projecting the blue wavelength band light, and red light source drive voltage information that is applied to the red light source when the red wavelength band light is projected. And are remembered,
The drive voltage information for each group is
A projector generated by adjusting a driving voltage value applied to the blue light source for each group so that an illuminance distribution of blue projection light matches or approximates an illuminance distribution of red projection light. The drive voltage information for each group is
The illuminance distribution of the blue projection light and the illuminance distribution of the red projection light when the plurality of blue light sources and the red light source are all lit in accordance with the drive voltage information stored in the light source control information storage unit, respectively. Compare at the measurement point,
If there is a difference in illuminance at the measurement location, measure the illuminance distribution of the blue projection light at the measurement location for each group,
The drive voltage value mutually adjusted between the groups so that the illuminance of the blue projection light when the plurality of blue light sources are all turned on at the measurement location matches or approximates the illuminance of the red projection light The projector according to claim 1, wherein the information is set according to the above. Illuminance distribution measuring means for measuring emission intensity and illuminance distribution of light emitted from the light source unit,
The light source control information storage means is obtained by sequentially turning on the all-blue light source and the red light source in accordance with the set drive voltage information before shipment of the projector and sequentially measuring the illuminance distribution measuring means. 3. The projector according to claim 1, wherein initial light emission intensity information that is initial information of light emission intensity of the projection light and the red projection light is stored. Measured information of emission intensity of blue projection light and red projection light obtained by sequentially turning on the all-blue light source and the red light source according to the drive voltage information and sequentially measuring by the illuminance distribution measuring means after the projector is shipped. A light emission intensity comparison means for comparing the measured light emission intensity information and the initial light emission intensity information,
The light source output control means determines whether or not a difference of a predetermined value or more is found in the emission intensity of the blue projection light and / or the red projection light between the measured emission intensity information and the initial emission intensity information. If there is a difference in light emission intensity and there is a difference in output balance between the blue projection light and the red projection light from the measured light emission intensity information, the output balance of the blue projection light and the red projection light is determined. 4. The drive voltage information of the blue light source and / or the red light source is adjusted so that the values match or approximate, and the adjusted drive voltage information is stored in the light source control information storage unit. The projector described.   5. The projector according to claim 4, wherein the light source control information storage unit stores in advance information serving as a reference of an allowable range with respect to the approximate degree of the light emission intensity. The light source output control means is configured to measure the illuminance distribution of the blue projection light and the illuminance distribution of the red projection light in a predetermined number of measurement locations when all the lights are turned on according to the drive voltage information stored in the light source control information storage means. Compare and
When there is a difference in illuminance at the measurement location, the blue light source is set so that the illuminance of the blue projection light when all of the plurality of blue light sources are turned on matches or approximates the illuminance of the red projection light. The projector according to claim 1, wherein a drive voltage value applied to the light source is adjusted, and the adjusted drive voltage information is stored as drive voltage information in the light source control information storage unit.   The projector according to claim 6, wherein the light source control information storage unit stores in advance information serving as a reference for an allowable range regarding the degree of approximation of the illuminance distribution. The light source control information storage means stores drive voltage information to be applied to each group of blue light sources during projection of green wavelength band light,
The drive voltage information for each group during the green projection is
The illuminance distribution of the green projection light and the illuminance distribution of the red projection light when the plurality of blue light sources and the red light source are all turned on according to the drive voltage information stored in the light source control information storage unit, respectively. Compare at the measurement point,
When there is a difference in illuminance at the measurement location, the illuminance distribution of the green projection light at the measurement location is measured for each group,
The drive voltage value adjusted mutually between the groups so that the illuminance of the green projection light when the plurality of blue light sources are all turned on at the measurement location matches or approximates the illuminance of the red projection light The projector according to any one of claims 1 to 7, wherein the projector is information set by the above. Excitation light irradiation device comprising a plurality of blue light sources, a fluorescent plate that receives emission light from the excitation light irradiation device and emits fluorescent light in the green wavelength band and diffused light in the blue wavelength band, and red wavelength band light A projector light source unit including a red light source, a projector control unit, and a light source control information storage unit.
Dividing the plurality of blue light sources into individually controllable groups;
A predetermined number of measurements of the illuminance distribution of the blue projection light and the illuminance distribution of the red projection light when the plurality of blue light sources and the red light source are all turned on according to the drive voltage information stored in the light source control information storage unit. Compare in place,
If there is a difference in illuminance at the measurement location, measure the illuminance distribution of the blue projection light at the measurement location for each group,
The drive voltage value to be applied to the blue light source is set to the group so that the illuminance of the blue projection light when the plurality of blue light sources are all lit at the measurement location matches or approximates the illuminance of the red projection light. Coordinate with each other,
A method for setting an initial driving voltage of a projector light source, characterized by storing information on an adjusted driving voltage value in the light source control information storage unit. The drive voltage value applied to the blue light source is mutually adjusted between the groups so that the illuminance distribution of the blue projection light matches or approximates the illuminance distribution of the red projection light, and information on the adjusted drive voltage value is obtained from the light source. After storing in the control information storage means,
The illuminance distribution of the green projection light and the illuminance distribution of the red projection light when the plurality of blue light sources are all turned on according to the drive voltage information stored in the light source control information storage means are also compared at a predetermined number of measurement locations. And
When there is a difference in illuminance at the measurement location, the illuminance distribution of the green projection light at the measurement location is measured for each group,
The drive voltage value to be applied to the blue light source is set to the group so that the illuminance of the green projection light when the plurality of blue light sources are all lit at the measurement location matches or approximates the illuminance of the red projection light. Coordinate with each other,
10. The method of setting an initial driving voltage of a projector light source according to claim 9, wherein information on the adjusted driving voltage value is stored in the light source control information storage unit. An excitation light irradiation device in which a plurality of blue light sources are divided into a predetermined number of groups and output control is possible for each group, fluorescent light in the green wavelength band and blue wavelength band in response to light emitted from the excitation light irradiation device A light source unit comprising a fluorescent plate that emits diffused light and a red light source that emits red wavelength band light, an illuminance distribution measuring unit that measures an illuminance distribution of the emitted light from the light source unit, and an initial stage of the red light source Light source control information storage means storing drive voltage value information and initial drive voltage value information for a blue light source for each group, and a light source output for controlling the light source unit according to the information stored in the light source control information storage means A projector control means having a control means, and a projector light source drive voltage setting method in a projector comprising:
Prior to the shipment of the projector, the all-blue light source and the red light source are sequentially turned on according to the initial drive voltage value, and the emission intensity of the blue projection light and the red projection light obtained by sequentially measuring by the illuminance distribution measuring means. Initial light emission intensity information storage processing for storing initial light emission intensity information as initial information in the light source control information storage means is performed,
Measured information of emission intensity of blue projection light and red projection light obtained by sequentially turning on the all-blue light source and the red light source according to the drive voltage information and sequentially measuring by the illuminance distribution measuring means after the projector is shipped. The measured emission intensity information and the initial emission intensity information are compared, and the emission intensity of the blue projection light and / or the red projection light is determined between the measured emission intensity information and the initial emission intensity information. A light emission intensity comparison determination process for determining whether a difference of a predetermined value or more is seen, and determining whether a difference is seen in the output balance between the blue projection light and the red projection light from the measured light emission intensity information;
In the light emission intensity determination process, when there is a difference in light emission intensity and there is a difference in output balance between the blue projection light and the red projection light from the measured light emission intensity information, the blue projection light and the red projection A driving voltage adjustment process for adjusting the driving voltage value of the blue light source and / or the red light source so that the output balance of light matches or approximates;
A drive voltage setting method for a projector light source, comprising: performing drive voltage information update processing for storing adjusted drive voltage information in the light source control information storage means. After the drive voltage adjustment process, the illuminance distribution of the blue projection light and the illuminance distribution of the red projection light in the case where all the lights are turned on according to the drive voltage information stored in the light source control information storage means at a predetermined number of measurement locations Illuminance distribution comparison judgment processing to compare
In the illuminance distribution comparison determination process, when there is a difference in illuminance at the measurement location, the illuminance of the blue projection light when all the blue light sources are turned on matches or approximates the illuminance of the red projection light. And an illuminance distribution adjustment process for adjusting a drive voltage value to be applied to the blue light source for each group,
12. The projector light source drive voltage setting method according to claim 11, wherein the drive voltage information update process is performed to store the adjusted drive voltage information as drive voltage information in the light source control information storage unit.

Images