WO2016174815A1 - Dispositif de commande de source de lumière, procédé de commande de source de lumière, et projecteur - Google Patents

Dispositif de commande de source de lumière, procédé de commande de source de lumière, et projecteur Download PDF

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Publication number
WO2016174815A1
WO2016174815A1 PCT/JP2016/001746 JP2016001746W WO2016174815A1 WO 2016174815 A1 WO2016174815 A1 WO 2016174815A1 JP 2016001746 W JP2016001746 W JP 2016001746W WO 2016174815 A1 WO2016174815 A1 WO 2016174815A1
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WIPO (PCT)
Prior art keywords
light emitting
light
line
light source
emitting unit
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PCT/JP2016/001746
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English (en)
Japanese (ja)
Inventor
道彦 飯田
Original Assignee
ソニー株式会社
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Publication date
Priority claimed from JP2015154780A external-priority patent/JP2016213171A/ja
Application filed by ソニー株式会社 filed Critical ソニー株式会社
Priority to US15/565,989 priority Critical patent/US10168607B2/en
Publication of WO2016174815A1 publication Critical patent/WO2016174815A1/fr
Priority to US16/193,175 priority patent/US10509305B2/en

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/165—Controlling the light source following a pre-assigned programmed sequence; Logic control [LC]

Definitions

  • the present technology relates to a projector, and relates to a light source control apparatus and method for controlling a light source of the projector.
  • Patent Document 1 discloses a drive circuit for driving a light emitting diode.
  • the driving circuit a light emitting unit including a set of six light emitting diodes connected in series, a plurality of drivers for driving a plurality of sets each including a plurality of light emitting units, and one driver for controlling these drivers
  • a driver control IC chip outputs a target current value signal and an adjustment command signal for causing the light emitting unit to emit light to each driver.
  • Each driver when receiving the adjustment command, adjusts the current by the voltage adjustment circuit so that the current flowing through the light emitting unit becomes the target current value. Since the adjustment operations by the drivers overlap in time, the time until all the adjustments of the drivers are completed is shortened (for example, paragraphs [0025], [0028], [ 0039], see FIGS.
  • an object of the present technology is to provide a light source control device, a light source control method, and a projector using the light source control device that can adjust the amount of light at high speed.
  • a light source control device includes a controller and a plurality of drivers.
  • the controller is configured to transmit a command value related to adjustment of the light amount of at least one light emitting unit.
  • the plurality of drivers each acquire the transmitted command value, and based on the command value, using a function of the drive value and the light amount for driving the light emitting unit set for each light emitting unit, The drive value for each light emitting unit is determined.
  • the plurality of drivers each determine the drive value using a predetermined function, so that the amount of light can be adjusted at high speed.
  • Individual drivers constituting the plurality of drivers may be configured to use a function approximated by a straight line as the function. Thereby, the calculation amount of these drivers can be reduced, which contributes to speeding up the light amount adjustment.
  • Each driver constituting the plurality of drivers may be configured to use a plurality of functions respectively set corresponding to a plurality of driving regions as the function. Thereby, the precision of light quantity adjustment improves.
  • Each of the drivers may be configured to use a function approximated by a plurality of linear regions set corresponding to a plurality of drive regions as a function approximated by the straight line. Thereby, the calculation amount of these drivers can be reduced as much as possible while improving the accuracy of light amount adjustment.
  • the individual drivers may be configured to use the function with the slope of the straight line, the reference light amount, and a reference drive value corresponding to the reference light amount as known parameters.
  • Each of the drivers may be configured to acquire or store in advance a calculation value based on the slope of the straight line and the reference light amount among the known parameters. Thereby, the amount of calculation at the time of light quantity adjustment is reduced, which contributes to speeding up the light quantity adjustment.
  • Pre-storing means pre-storing prior to light amount adjustment.
  • the controller may be configured to update the function based on a predetermined condition. This makes it possible to adjust the light amount with high accuracy even when the light emitting portion changes with time.
  • the plurality of drivers may include a plurality of first wavelength band light emitting drivers and a plurality of second wavelength band light emitting drivers.
  • the plurality of first wavelength band light emitting drivers are configured to drive a plurality of light emitting sections that emit light in a first wavelength band among the light emitting sections.
  • the plurality of second wavelength band light emitting drivers are configured to drive a plurality of light emitting sections that emit light in a second wavelength band different from the first wavelength band among the light emitting sections.
  • the controller may be configured to transmit a first command value to the plurality of first wavelength band light emission drivers and to transmit a second command value to the plurality of second wavelength band light emission drivers. Good. Thereby, even if the light emitting unit emits light of two or more colors, the light amount can be adjusted at high speed.
  • the plurality of drivers may include a first driver and a second driver.
  • the first driver generates a voltage between a reference potential in a reference line and a potential in the first line that is higher than the reference potential, and is connected between the reference line and the first line.
  • One light emitting unit is configured to be driven, and can be connected to the reference line and the first line.
  • the second driver generates a voltage between the reference potential and a potential lower than the reference potential in the second line, and a second light emission connected between the reference line and the second line. And is connectable to the reference line and the second line. Since the second driver generates a voltage with a potential lower than the reference potential, the sum of currents flowing into the controller board including the controller, the first driver, and the second driver via the reference line is reduced. That is, since the current flowing into the controller board via the reference line is reduced, the occurrence of a potential difference due to the reference line pattern on the controller board can be suppressed. Thereby, generation
  • Connection means an electrical connection in this specification.
  • the first driver and the second driver may be configured to use a potential of zero volts as the reference potential. By setting the reference potential to zero volts, circuit design of each driver is facilitated.
  • the reference potential may be set to a constant potential
  • the second driver may be configured to adjust the drive value by adjusting a potential lower than the reference potential.
  • the first driver may be configured to adjust the drive value by adjusting a potential higher than the reference potential.
  • the light source control device connects a connection destination of the first light emitting unit to connect the anode of the first light emitting unit to the reference line and connect the cathode of the first light emitting unit to the second line. You may further provide the change part to change. Thereby, even when a part of the light emitting unit breaks down, the control of the light source unit is facilitated, and the occurrence of uneven illuminance can be suppressed.
  • the light source control device connects the cathode of the second light emitting unit to the reference line and connects the anode of the second light emitting unit to the first line. You may further comprise the change part which changes a connecting point.
  • the light source control device may further include a resistance element provided on at least one of a line connected to the controller and a line connected to the plurality of drivers among the reference lines. Thereby, the return current can be changed into thermal energy by the resistance element, and the current value flowing into the controller and the plurality of drivers can be lowered.
  • the individual drivers constituting the plurality of drivers are configured to use, as the function, a function of an average light amount obtained by dividing a total light amount of the plurality of light emitting units according to a driving value by the number of the light emitting units. May be.
  • the individual drivers constituting the plurality of drivers may be configured to use different drive value switching start timings based on the command values.
  • a delay time may be set at the drive value switching start timing by at least one of the individual drivers.
  • the individual drivers may be configured to selectively use a plurality of different switching start timings according to a change amount of the driving value before and after switching of the driving value.
  • the light source control method includes transmitting a command value related to adjustment of the light amount of at least one light emitting unit by a controller.
  • the transmitted command values are acquired by a plurality of drivers, respectively.
  • the driving value for each light emitting unit is determined by the plurality of drivers based on the command value using a function of the driving value for driving the light emitting unit and the light amount set for each light emitting unit. Is done.
  • a light source control device includes the first driver, the second driver, and a controller unit.
  • the controller unit is connectable to the reference line, the first driver, and the second driver, and is configured to control the first driver and the second driver. Since the second driver generates a voltage with a potential lower than the reference potential, the sum of the currents flowing into the controller unit, the first driver, and the second driver via the reference line is reduced. That is, since the current flowing into the controller unit via the reference line is reduced, the occurrence of a potential difference due to the reference line pattern of the controller unit can be suppressed. Thereby, generation
  • a driver unit includes the first driver and the second driver.
  • the light source unit includes a first light emitting unit and a second light emitting unit.
  • the first light emitting unit is connected between a reference line and a first line, and a current generated by a voltage generated between a reference potential in the reference line and a potential higher than the reference potential in the first line. It is driven by.
  • the second light emitting unit is connected between the reference line and the second line, and is based on a voltage generated between a reference potential in the reference line and a potential lower than the reference potential in the second line. Driven by current.
  • a projector includes a plurality of light emitting units, a light modulation element that modulates light from the plurality of light emission units, a projection optical system that projects modulated light obtained by being modulated by the light modulation element, A light source control device.
  • the plurality of light emitting units include a first light emitting unit connected between a reference line and a first line, and a second light emitting unit connected between the reference line and the second line. May be included.
  • the plurality of drivers may include the first driver and the first driver.
  • a projector includes the plurality of light emitting units, the light modulation element, the projection optical system, the driver unit, and the controller unit.
  • the light amount of the light emitting unit can be adjusted at high speed.
  • the effects described here are not necessarily limited, and may be any of the effects described in the present disclosure.
  • FIG. 1 is a block diagram illustrating a configuration of a light source control device according to an embodiment of the present technology.
  • FIG. 2 is a graph showing the relationship between the drive current as the drive value of the light emitting unit and the amount of light.
  • FIG. 3 is a graph showing the relationship between the drive current and the amount of light for an embodiment in which the function is approximated by a single line in the drive region equal to or greater than the oscillation threshold current.
  • FIG. 4 is a flowchart showing the operation of the light source control device having the relationship between the drive current and the light quantity shown in FIG.
  • FIG. 5 is a graph showing the relationship between the drive current and the amount of light for an embodiment in which the function is approximated by two straight lines in a drive region equal to or greater than the oscillation threshold current.
  • FIG. 1 is a block diagram illustrating a configuration of a light source control device according to an embodiment of the present technology.
  • FIG. 2 is a graph showing the relationship between the drive current as the drive value of the light emitting
  • FIG. 6 is a flowchart showing the operation of the light source control device having the relationship between the drive current and the light quantity shown in FIG.
  • FIG. 7 is a block diagram illustrating a light source control device according to another embodiment of the present technology.
  • FIG. 8 shows a configuration example of an optical system of a projector including the light source control device shown in FIG.
  • FIG. 9 is a diagram illustrating a configuration of a light source and a light source control device for explaining another problem, and is a diagram according to a comparative example of the present technology.
  • FIG. 10 is a diagram illustrating a configuration of a light source unit and a light source control device that controls the light source unit, according to an embodiment for solving the another problem.
  • FIG. 8 shows a configuration example of an optical system of a projector including the light source control device shown in FIG.
  • FIG. 9 is a diagram illustrating a configuration of a light source and a light source control device for explaining another problem, and is a diagram according to a comparative example of
  • FIG. 11 is a diagram illustrating a configuration of a light source unit according to a form different from the embodiment illustrated in FIG. 10 and a light source control device that controls the light source unit.
  • FIG. 12 is a graph showing the relationship between the drive current and the amount of light according to the third embodiment.
  • FIG. 13A is a graph showing the relationship between drive current and total light quantity.
  • FIG. 13B is a graph showing the relationship between the drive current and the average light amount.
  • FIG. 14A shows an example (comparative example) in which the drive current is changed (a predetermined current value is lowered) for light amount adjustment when there is no delay time.
  • FIG. 14B shows an example of the present embodiment in which the settling completion timing is set almost simultaneously by setting the delay time.
  • FIG. 1 is a block diagram illustrating a configuration of a light source control device according to an embodiment of the present technology.
  • the light source control device 101 is typically used as a device for driving a light source of a projector having a light modulation element such as a liquid crystal element.
  • a light source control device that receives an image signal (video signal) from the projector and controls light emission based on the image signal will be described.
  • the light source control device 101 includes a video signal processing unit 15, a controller 20, and a plurality of drivers 30.
  • a light source (light source unit) 50 including a plurality of light emitting units 40 is electrically connected to the plurality of drivers 30.
  • the video signal processing unit 15 is composed of, for example, a chip that processes video signals, and executes various processes related to video signals input from, for example, an external device (for example, a PC). Further, the video signal processing unit 15 is configured to send, for example, luminance data to the controller 20 as a part of the video data.
  • the controller 20 includes, for example, a main controller 22 and an interface unit 24.
  • the main controller 22 is mainly composed of a CPU (Central Processing Unit) or an MPU (Micro Processing Unit) and includes a RAM (Random Access Memory), a ROM (Read On Iy Memory), and the like.
  • the main controller 22 is configured to acquire the luminance data and the like output from the video signal processing unit 15.
  • the main controller 22 has a function of controlling the amount of light so that light having substantially the same brightness is generated in the entire plurality of light emitting units 40 using a predetermined algorithm based on the acquired luminance data.
  • the controller 20 drives each driver 30 so that the entirety of the plurality of light emitting units 40 has substantially the same brightness for each frame of the video signal (or for each frame). Configured to control.
  • the above predetermined algorithm is an algorithm for causing the light emitting unit 40 to emit light with a luminance having a predetermined number of bits according to the overall luminance for each frame, for example.
  • the luminance of the entire plurality of light emitting units 40 is set to be relatively small.
  • most of the area of the screen is black, but if there is a relatively bright area in a part of the screen, the luminance of the plurality of light emitting units 40 as a whole corresponds to the luminance corresponding to the relatively bright area. To be unified.
  • the overall luminance of the plurality of light emitting units 40 is adjusted so that the highest luminance value among the luminance values of all the pixels in the image data input to the projector can be reproduced.
  • the command value for adjusting the light amount of the light emitting unit based on the input image data the light amount of the light emitting unit can be reduced when the entire screen is dark. Therefore, power consumption in the light emitting unit 40 can be suppressed and the life of the light emitting unit 40 can be extended. Further, since the amount of light blocked by the liquid crystal element can be reduced, the life of the liquid crystal element can be extended.
  • the interface unit 24 is configured by a control board that receives a command value relating to the adjustment of the light amount output from the main controller 22 and broadcasts the command value to each driver 30.
  • a standard for transmission from the main controller 22 to the interface unit 24 for example, UART (Universal Asynchronous Receiver Receiver Transmitter) is used, so that the system can be realized at low cost. Of course, other standards may be adopted.
  • the main controller 22 and the interface unit 24 are configured as separate chips, but may be configured as a single chip.
  • the driver 30 has a function of driving the light emitting unit 40.
  • a light emitting unit 40 is connected to each driver 30.
  • the driver 30 is connected to the interface unit 24 in parallel.
  • One light emitting unit 40 is configured by connecting a plurality of light emitting elements 42 in series.
  • As the light emitting element 42 for example, an LD (Laser Diode) is used.
  • I2C Serial Peripheral Interface
  • SPI Serial Peripheral Interface
  • SS Seve-Select
  • the number of connections increases by one connection for each slave, and the board area corresponding to the number is required, and the port corresponding to the number is required on the master side.
  • FIG. 2 is a graph showing the relationship between the drive current as the drive value of the light emitting unit 40 and the light quantity.
  • the principle of light emission control for obtaining substantially the same uniform luminance in the entirety of the plurality of light emitting units 40 will be described.
  • each light emitting unit 40 has substantially the same form, but each light emitting unit 40 has some individual differences.
  • at least two light emitting units 40 among all the light emitting units 40 have no individual difference and may have the same relationship between drive current and light quantity.
  • P0 is the amount of light corresponding to the oscillation threshold current I0 of the light emitting element 42 constituting the light emitting unit 40.
  • the oscillation threshold current I0 is a current value that generates a minimum amount of light.
  • Pc is a reference light amount, which is the maximum light amount in this embodiment. Let Ic be a drive current as a reference drive value (reference drive current) for obtaining the reference light quantity.
  • each driver 30 stores functions (inverse functions) f ⁇ 1 and Pc in advance.
  • the controller 20 broadcasts y to each driver 30 as a command value, so that each driver 30 can individually calculate Iy using Equation 0.5. That is, each driver 30 can determine the drive current Iy based on the command value y using the function f ⁇ 1 .
  • the drive current Iy may be different for each driver 30 even with the same command value y.
  • each driver 30 may store each data value of the drive current and the amount of light corresponding to the drive current defined by Equation 0.5 in a lookup table format.
  • the memory of the driver 30 may be either a volatile type or a non-volatile type.
  • the controller 20 may store the function f ⁇ 1 and look-up table data in advance. Then, the controller 20 may pass the function f ⁇ 1 and the look-up table to each driver 30 at a timing when the light source control device 101 is turned on or at a predetermined timing thereafter.
  • the non-volatile memories are May be stored.
  • these nonvolatile memories may be stored in advance at the time of factory shipment.
  • Embodiment 1 (specific function example 1)
  • FIG. 3 is a graph showing the relationship between the drive current and the amount of light according to the embodiment.
  • the graph of the first embodiment is approximated by a straight line in the drive region from the oscillation threshold current I0 to the reference drive current Ic corresponding to the maximum light amount Pc. From this graph, the slope (Pb-Pa) / (Ib-Ia) of the straight line is set as k1 as shown in the following formula 1.1.
  • Expression 1.1 is Expression 1.2, that is, Iy is expressed as a function of Py as shown in Expression 1.3.
  • Py-Pc k1 (Iy-Ic)
  • Iy f -1 (Py)
  • Iy (Py-Pc) / k1 + Ic
  • Equation 1.5 Equation 1.6 below.
  • Each driver 30 stores k1, Pc, and Ic as known parameters. Instead of k1 and Pc, ⁇ that is an operation value based on k1 and Pc may be stored.
  • the interface unit 24 of the controller 20 broadcasts, for example, y-1 as a command value to the driver 30 so that each driver 30 calculates the drive current Iy using Expression 1.6. be able to.
  • FIG. 4 is a flowchart showing the operation of the light source control apparatus 101 according to the first embodiment.
  • the controller 20 transmits the known parameters Ic and ⁇ , which are predetermined for each driver 30, to each driver 30, for example, as an initial setting (step 101).
  • Individual drivers 30 obtain Ic and ⁇ and store them in memory.
  • each driver 30 may store Ic and ⁇ in advance in a nonvolatile memory.
  • the controller 20 transmits a drive start command for driving the light emitting unit 40 to each driver 30 using the current Ic as a target drive current (step 102).
  • the drive start command is also typically notified by broadcast.
  • This command value y-1 is a calculated value based on the rate of change y from the maximum light amount Pc.
  • Each driver 30 determines the current Iy as a target drive current based on the acquired command value y ⁇ 1 using the formula 1.6 including Ic and ⁇ stored in step 101, and the light emitting unit 40 uses this drive current Iy.
  • Is driven step 104).
  • the controller 20 broadcasts the command value y-1, so that each driver 30 calculates the drive current Iy using Equation 1.6. That is, the controller 20 does not need to transmit to each driver 30 a drive current value that may be different for each light emitting unit 40 (for each driver 30). Therefore, speeding up of the light amount adjustment can be realized.
  • the controller 20 has transmitted different command values (for absorbing individual light intensity differences for each light emitting unit 40) to the individual drivers 30, the transmission will be in time for each frame. Absent.
  • the controller 20 since the controller 20 only needs to broadcast the same command value, the light amount adjustment for each light emitting unit 40 can be performed, for example, for each frame.
  • the controller 20 sends y-1 as a command value, but may of course send y. In that case, each driver 30 calculates y-1. However, since y-1 is a value common to each driver 30, the controller 20 calculating y-1 contributes to speeding up the light amount adjustment.
  • the controller 20 may calculate Pc / k1 for each light amount adjustment instead of having ⁇ in advance as described above.
  • Pc / k1 is known, and by performing arithmetic processing such as division in advance as in the present embodiment, the amount of calculation at the time of light amount adjustment is reduced, which contributes to speeding up the light amount adjustment. .
  • FIG. 5 shows functions according to another embodiment different from the first embodiment.
  • the same explanation portions will be simplified or omitted, and different points will be mainly described.
  • this function is approximated by a plurality of linear regions corresponding to a plurality of driving regions from the oscillation threshold current I0 to the reference driving current Ic that is the reference driving value. . That is, a plurality of functions are defined in a drive region where the oscillation threshold current I0 is equal to or higher. Specifically, this function is divided into two linear regions.
  • a region from the drive current Ib to the reference drive current Ic is a first drive region
  • a region from the oscillation threshold current I0 to the drive current Ib is a second drive region.
  • the straight line slope k1 of the first drive region and the straight line slope k2 of the second drive region are expressed by the following equations 2.1 and 2.2, respectively.
  • k1 (Pc-Pb) / (Ic-Ib) ...
  • k2 (Pb-Pa) / (Ib-Ia) ... Equation 2.2
  • Equation 2.5 is expressed by Equation 2.6 below.
  • Iy ⁇ 2y- ⁇ 3 + Ib ⁇ ⁇ ⁇ Equation 2.6
  • each driver 30 is configured to calculate the drive current Iy using Equation 2.3 in the first drive region and Equation 2.6 in the second drive region.
  • Each driver 30 stores k1, k2, Pc, Ic, Pb, and Ib as known parameters. Instead of k1, ⁇ 1 that is the operation value of Pc may be stored, and ⁇ 2 that is the operation value of Pc may be stored instead of k2. Further, in place of k2, ⁇ 3 that is an operation value of Pbb may be stored.
  • each driver 30 can change the equation 2.3.
  • the drive current Iy can be calculated using Equation 2.6.
  • FIG. 6 is a flowchart showing the operation of the light source control apparatus according to the second embodiment.
  • the controller 20 transmits the known parameters Ic, Ib, ⁇ 1, ⁇ 2, ⁇ 3, which are predetermined for each driver 30, to each driver 30, for example, as an initial setting.
  • Each driver 30 acquires Ic, Ib, ⁇ 1, ⁇ 2, and ⁇ 3 and stores them in the memory.
  • each driver 30 may store Ic, Ib, ⁇ 1, ⁇ 2, and ⁇ 3 in advance in a nonvolatile memory.
  • the controller 20 transmits a drive start command for driving the light emitting unit 40 to each driver 30 using the current Ic as a target drive current (step 202).
  • the controller 20 When the controller 20 receives, for example, a light amount adjustment (dimming adjustment in this case) command from the video signal processing unit 15, the controller 20 broadcasts the same command value y to each driver 30 (step 203).
  • a light amount adjustment dimming adjustment in this case
  • each driver 30 determines that Pb ⁇ Py (y1 ⁇ y), based on the command value y, the driver 30 determines the drive current Iy as a target drive current using Formula 2.3, and emits light with this drive current Iy.
  • the unit 40 is driven (step 205).
  • the driving current Iy is determined as a target driving current using the equation 2.6 based on the command value y, and the driving current Iy is The light emitting unit 40 is driven (step 206).
  • the second embodiment since the relationship between the drive current and the light amount is defined in a plurality of drive regions, the amount of calculation is increased compared with the first embodiment, but the accuracy of light amount adjustment is improved. .
  • Embodiments 1 and 2 described above also have the following effects. Compared with a mode in which a controller such as a CPU or MPU transmits a target current value set for each driver while calculating, in this embodiment, each driver 30 calculates in parallel, so the calculation execution time is shortened.
  • the load on the main controller 22 is reduced, and other processes to be executed by the main controller 22 can be executed at high speed.
  • FIG. 7 is a block diagram showing a light source control device according to another embodiment of the present technology.
  • the light source control device 102 has a configuration in which the light source of the light source control device 101 shown in FIG. 1 is replaced with three light sources 50R, 50G, and 50B that emit light of three different colors, that is, emits light in a plurality of wavelength ranges. Light sources 50R, 50G, and 50B.
  • the light source 50R includes a plurality of light emitting units 40 that emit light having a red wavelength range, for example.
  • the light emission G includes a plurality of light emitting units 40 that emit light having a green wavelength range.
  • the light source 50B includes a plurality of light emitting units 40 having a blue wavelength range. That is, white light is generated by the light sources 50R, 50G, and 50B.
  • the light emitting section 40 is composed of a plurality of light emitting elements 42 connected in series.
  • the controller 20 acquires the luminance data of the video signals corresponding to the three light sources 50R, 50G, and 50B from the video signal processing unit 15, and based on the luminance data, for each light source 50 for each frame or every plurality of frames.
  • the light sources 50R, 50G, and 50B are caused to emit light with the brightness (luminance) of the entire light emitting unit 40.
  • the controller 20 is basically configured to broadcast different command values (may be the same) for each light source 50 at the same time for all the light sources 50. Alternatively, there may be a slight transmission timing shift (for example, a time shift sufficiently shorter than one frame time) that does not affect the video display between the different light sources 50.
  • each driver 30 determines the drive current for each light source 50 based on the command value using the function as described above, and causes each light source 50R, 50G, 50B to emit light with the drive current.
  • the controller 20 is provided with a driver 30 (a plurality of first wavelength band lights) provided for each light source 50 that generates light having a plurality of wavelength bands (that is, including at least the first wavelength band and the second wavelength band).
  • the command value (including at least the first command value and the second command value) is broadcast to the driver for use and the plurality of drivers for light emission in the second wavelength range.
  • each driver 30 determines a drive current using a function, even if it uses three light sources 50R, 50G, and 50B, light quantity adjustment can be performed at high speed.
  • FIG. 8 shows a configuration example of an optical system of a projector including the light source control device 102 shown in FIG.
  • the projector 500 includes a light source device 100 that can emit white light, an image generation unit 200 that generates an image based on light from the light source device 100, and a projection unit that projects the generated image onto a screen (not shown). Projection optical system) 400.
  • the light source device 100 emits white light W by combining red laser light R in the red wavelength region, green laser light G in the green wavelength region, and blue laser light B in the blue wavelength region.
  • the light source device 100 is a device including the light source control device 102 shown in FIG. 7, for example.
  • the image generation unit 200 includes a light modulation element 210 that generates an image based on the irradiated light, and an illumination optical system 220 that irradiates the light modulation element 210 with white light from the light source device 100.
  • the illumination optical system 220 includes dichroic mirrors 260 and 270, mirrors 280, 290 and 300, relay lenses 310 and 320, field lenses 330R, 330G and 330B, light modulation elements 210 such as liquid crystal elements 210R, 210G and 210B, and dichroic prisms. 340 is included.
  • the dichroic mirrors 260 and 270 have a property of selectively reflecting color light in a predetermined wavelength range and transmitting light in other wavelength ranges.
  • the dichroic mirror 260 selectively reflects the green laser light G and the blue laser light B.
  • the dichroic mirror 270 selectively reflects the green laser light G out of the green laser light G and the blue laser light B reflected by the dichroic mirror 260.
  • the remaining blue laser light B passes through the dichroic mirror 270. Thereby, the light emitted from the light source device 100 is separated into a plurality of laser beams of different colors. Note that the configuration for separating the laser light into a plurality of laser beams and the devices used are not limited.
  • the separated red laser light R is reflected by the mirror 280, is collimated by passing through the field lens 330R, and enters the liquid crystal element 210R.
  • the green laser light G is collimated by passing through the field lens 330G and enters the liquid crystal element 210G.
  • the blue laser light B is reflected by the mirror 290 through the relay lens 310 and further reflected by the mirror 300 through the relay lens 320.
  • the blue laser light B reflected by the mirror 300 is collimated by passing through the field lens 330B and enters the liquid crystal element 210B.
  • the liquid crystal elements 210R, 210G, and 210B are electrically connected to a signal source (not shown) (such as a PC) that supplies an image signal including image information.
  • the liquid crystal elements 210R, 210G, and 210B modulate incident light for each pixel based on the supplied image signals of each color, and generate a red image, a green image, and a blue image, respectively.
  • the modulated laser beams (formed images) are incident on the dichroic prism 340 and synthesized.
  • the dichroic prism 340 superimposes and synthesizes light of each color incident from three directions and emits the light toward the projection unit 400.
  • the projection unit 400 projects the image generated by the light modulation element 210.
  • the projection unit 400 includes a plurality of lenses 410 and the like, and irradiates a screen or the like (not shown) with light synthesized by the dichroic prism 340. As a result, a full color image is displayed.
  • the controller 20 may be configured to update a function or a parameter constituting the function based on a predetermined condition.
  • the predetermined condition is that the current known parameter is determined from the function (the known parameter) stored by default in the light source control device when the power is turned on or when the light source control device is stored by default.
  • the light source control device includes a luminance sensor
  • the controller 20 checks the drive current and the light emission amount of the light emitting unit 40 when they are regularly, irregularly, or when there is a user operation input. What is necessary is just to be comprised so that it may record. As a result, even when the light emitting unit 40 changes over time, the light amount can be adjusted with high accuracy.
  • an LED Light Emitting Diode
  • LD Light Emitting Diode
  • the reference light amount is the maximum light amount, but is not limited thereto, and may be any light amount.
  • a liquid crystal element is used as the light modulation element
  • a DMD Digital Micro-mirror Device
  • the design is such that six parallel lines are routed from the interface unit 24 (see FIG. 7).
  • the controller is configured to broadcast the command value to each driver. However, it is not necessarily “broadcast”, and the controller may be configured to shift the transmission timing of the command value to at least two drivers.
  • one light emitting unit 40 includes a plurality of light emitting elements 42, but may be configured by a single light emitting element 42.
  • the embodiments of the light source control device described above can be combined with the embodiments of the light source control device and the light source unit described below. Further, the projector described above can include a light source control device and a light source unit according to the embodiments described below.
  • the return current of each light emitting unit in the light source is a relatively large current.
  • a reference line typically a ground line
  • the following problems May happen. That is, when a large current flows into the ground line, a potential difference based on a resistance value defined by the wiring pattern is generated, thereby generating common mode noise.
  • Another object of the present disclosure is to provide a technique capable of suppressing the occurrence of a potential difference due to the wiring pattern of the reference line.
  • FIG. 9 is a diagram illustrating a configuration of a light source and a light source control device for specifically explaining the above problem, and is a diagram according to a comparative example of the present technology.
  • the apparatus shown in FIG. 9 includes a power supply unit 60, a controller unit (for example, a controller board) 120, a driver unit 150, and a light source (light source unit) 50.
  • a controller unit for example, a controller board
  • driver unit 150 for example, a driver unit 150
  • a light source (light source unit) 50 for example, a light source 50.
  • the illustration and description of the power supply unit 60 are omitted.
  • the controller unit 120 sends control signals to a plurality of drivers 30 mounted on the driver unit 150, and controls the driving of these drivers 30, respectively.
  • the controller unit 120 includes a substrate unit including the “controller 20” (see FIG. 1) of the above-described embodiment.
  • the controller unit 120 may include the interface unit 24 and the video signal processing unit 15, and when they are not included, they may be provided outside the controller unit 120.
  • the light emitting unit 40 is connected to each driver 30 of the driver unit 150.
  • One light emitting unit 40 includes, for example, a plurality of light emitting elements 42 connected in series as described above.
  • the power supply unit 60 supplies power to the controller unit 120 and the driver unit 150, and supplies power to the light source unit 50 via the driver unit 150.
  • the driver unit 150 (each driver 30) is connected to a positive power supply line 51 (plural) and a ground line 59. Each light emitting unit 40 is connected between the ground line 59 and the positive power supply line 51. A potential higher than zero volts of the ground line 59 is applied to the positive power supply line 51, and each light emitting unit 40 is driven by a current due to a voltage between the ground line 59 and the positive power supply line 51.
  • a return current from the light emitting unit 40 that passes through the ground line 59 is a large current, and this large current flows into the driver unit 150 and the controller unit 120.
  • a large return current of 20 A to 40 A flows through the ground line 59.
  • the current values flowing through the light emitting units 40 are assumed to be If1, If2, If3, and If4.
  • Ir Ir + Is.
  • Ig Ir. That is, a current of 1/2 of Ir flows into the controller unit 120.
  • the driver unit 150 is designed to handle a large current, even if a large current flows into the driver unit 150 as a return current, a problem hardly occurs.
  • a large current flows into the controller unit 120, as described above, a potential difference based on the resistance value determined by the wiring pattern of the ground line of the controller unit 120 is generated, thereby generating common mode noise.
  • an electronic device including the light source and the light source control device may include a conductive frame 70 that supports each element such as the light source unit 50 and the controller unit 120 (controller board).
  • the conductive frame 70 functions as an electrical ground for the light source control device.
  • a potential difference is generated between the grind line of the controller unit 120 and the conductive frame 70 as described above, thereby generating common mode noise.
  • the conductive frame 70 schematically shows the insulation of the light source unit 50 from the controller unit 120 (conductive frame 70) by a broken line “x” mark.
  • the cable connecting the driver unit 150 and the light source unit 50 is disconnected.
  • the light source unit 50 is electrically floated, and the light source unit 50 has an internal floating state. There is a problem that the light emitting element 42 deteriorates due to the generation of static electricity.
  • FIG. 10 shows a configuration of a light source unit and a light source control device that controls the light source unit according to an embodiment for solving the above-described problems.
  • the same elements as those of the apparatus according to the comparative example are denoted by the same reference numerals, and the description thereof is omitted or simplified.
  • the light source unit 50A according to the present embodiment includes a positive power supply line (first line) 51 and a ground line (reference line) 59.
  • the negative power supply line (second line) 52 is further provided.
  • the second light emitting unit 40 b that is at least one light emitting unit 40 is connected between the ground line 59 and the negative power supply line 52.
  • the driver unit 150 is connected to the ground line 59, the positive power supply line 51, and the negative power supply line 52. Specifically, the driver unit 150 generates a voltage between a reference potential (for example, 0V) and a potential higher than the reference potential, and one or more first drivers 31 that drive the first light emitting unit 40a. Have That is, the first driver 31 is connected to the positive power supply line 51 and the ground line 59 (line 59s).
  • a reference potential for example, 0V
  • the driver unit 150 includes one or more second drivers 32 that generate a voltage between a reference potential (for example, 0 V) and a potential lower than the reference potential, and drive the second light emitting unit 40b. That is, the second driver 32 is connected to the negative power supply line 52 and the ground line 59 (line 59s).
  • a reference potential for example, 0 V
  • the second driver 32 is connected to the negative power supply line 52 and the ground line 59 (line 59s).
  • the current values flowing through the two first light emitting units 40a are assumed to be If1 and If2, respectively. Further, current values flowing through the two second light emitting units 40b are assumed to be If3 and If4, respectively.
  • Ir is a value obtained by subtracting If3 and If4 from the sum of If1 and If2.
  • each light emitting unit 40 is driven by constant current driving (including the brightness adjustment range)
  • the return current flowing into the controller unit 120 via the ground line 59 can be set to a very small value. Thereby, the occurrence of a potential difference due to the wiring pattern of the ground line of the controller unit 120 is also suppressed, and common mode noise is suppressed. As a result, malfunction during signal processing in the controller unit 120 can be prevented.
  • the return current is very small, as described above, it is not necessary to insulate the light source unit 50 from the conductive frame 70 serving as the ground base.
  • work for example, maintenance work
  • the light source unit 50 is not electrically floated, and generation of static electricity in the light source unit 50 is suppressed. Thereby, deterioration of the light emitting element 42 is also suppressed.
  • the first light emitting unit 40a is connected between the high potential side line (first line) and the reference line (reference potential side line), and the reference line and the low potential side line (second line).
  • the second light emitting unit 40b may be connected between the two. That is, the anode of the first light emitting unit 40a is connected to the high potential side line, and the cathode of the first light emitting unit 40a is connected to the reference line.
  • the anode of the second light emitting unit 40b is connected to the reference line, and the cathode of the second light emitting unit 40b is connected to the low potential side line.
  • the drive potential (current value) is adjusted by setting the reference potential to be constant (typically 0 V which is the ground potential) and the second driver 32 adjusting the potential of the negative power supply line 52. can do.
  • the first driver 31 is configured to adjust the drive value (current value) by adjusting the potential of the positive power supply line 51.
  • This light source control device may include a resistance element Rg provided on the line 59g and Rs provided on the line 59s as shown in FIG. As a result, the return current can be changed into thermal energy, and the value of the return current flowing into the controller unit 120 and the driver unit 150 can be lowered.
  • resistance elements Rg and Rs may be provided. In this case, preferably, only the resistance element Rg is provided. Note that the resistance elements Rg and Rs are not essential elements.
  • FIG. 11 shows a configuration of a light source and a light source control device according to another embodiment for solving the above problem.
  • the apparatus according to this embodiment is different from the above embodiment in the following points.
  • the first light emission is performed such that the anode of the first light emitting unit 40 a on the high potential side is connected to the ground line 59 and the cathode of the first light emitting unit 40 a is connected to the negative power supply line 52.
  • a changing unit for changing the connection destination of the unit 40a is provided.
  • the changing unit includes a controller unit 120 and switch groups S1 and S2.
  • the switch group S1 includes four switches Q1 to Q4 connected to one or more (or all) first light emitting units 40a.
  • the switch group S2 includes four switches Q1 to Q4 connected to one or more (or all) second light emitting units 40b.
  • FIG. 11 shows a configuration in which a switch group is provided for each of the first light emitting unit 40a and the second light emitting unit 40b.
  • switches Q1 to Q4 for example, semiconductor switches such as FET (Field-Effect-Transistor) are used. These switches Q1 to Q4 are controlled to be switched ON / OFF by the controller unit 120. Below, switch group S1 of the 1st light emission part 40a is demonstrated.
  • the switch Q1 is connected between the positive power supply line 51 and the anode of the first light emitting unit 40a (the anode of the light emitting element 42 at the end).
  • the switch Q2 is connected between the cathode of the first light emitting unit 40a (the cathode of the light emitting element 42 at the opposite end) and the ground line 59.
  • the switch Q3 is connected to the anode of the first light emitting unit 40a in parallel with the switch Q1, and is connected between the anode of the first light emitting unit 40a and the ground line 59.
  • the switch Q4 is connected to the cathode of the first light emitting unit 40a in parallel with the switch Q2, and is connected between the cathode of the first light emitting unit 40a and the ground line 59.
  • the light source unit 50 includes a plurality of (for example, ten) first light emitting units 40a and a plurality of (for example, ten) second light emitting units 40b.
  • the controller unit 120 detects this by some method. Examples of the detection method include current detection, voltage detection, and light emission illuminance detection.
  • the controller unit 120 switches the switch group S1 so that one first light emitting unit 40a provided with the switch group S1 functions as a low potential side light emitting unit, that is, as a second light emitting unit.
  • the switches Q1 and Q2 are turned off and the switches Q3 and Q4 are turned on.
  • the electrical balance and illumination intensity balance of the positive side and negative side of the light source unit 50 can be taken. As a result, even when a part of the light emitting unit breaks down, the control of the light source unit 50 is facilitated, and the occurrence of uneven illumination can be suppressed.
  • the ON / OFF of the switch group may be controlled for other purposes.
  • Other purposes include, for example, adjusting the basic amount of light emitted from the light source unit 50 (for example, in the case where the device is always used with a light amount half the maximum emitted light amount).
  • the reference potential is set to be constant (typically, 0 V that is the ground potential) and the second driver 32 adjusts the potential of the negative power supply line 52 in the same manner as in the above-described embodiment.
  • the drive value (current value) can be adjusted.
  • the first driver 31 is configured to adjust the drive value (current value) by adjusting the potential of the positive power supply line 51.
  • the third embodiment is a modification of a form including a plurality of drive regions (for example, a plurality of linear function regions). That is, the third embodiment is also applied when the curve of the entire function is approximated by a plurality of linear regions, as in the second embodiment.
  • FIG. 12 is a graph showing the relationship between the drive current and the amount of light according to the third embodiment. Indicates a function. This function has, for example, six linear regions from the oscillation threshold current I0 to the reference drive current Ic as a plurality of function regions.
  • n is an integer of 0 or more.
  • the reference drive current Ic is I 6
  • the reference light amount Pc corresponding to this Ic is P 6 .
  • Slope k n is the gist of the same in the above formula 1.1, expressed as formula 3.2 below.
  • k n (P n + 1 -P n ) / (I n + 1 -I n ) ... Equation 3.2
  • Equation 3.3 [(I n + 1 -I n ) / (P n + 1 -P n )] (Py-P n ) + I n Equation 3.3
  • Each driver 30 acquires the maximum value of n (6 in the present embodiment), I n , and P n as known parameters from the controller 20 or stores them in advance. For example, the controller 20 transmits these known parameters to the driver 30 before the light amount adjustment (for example, when the power is turned on). Or each driver 30 memorize
  • each driver 30 obtains the calculation result of “(I n + 1 ⁇ I n ) / (P n + 1 ⁇ P n )” for each straight line area in the equation 3.3 from the controller 20, or Alternatively, it may be stored in advance.
  • the drivers 30 determine which linear region should be applied for adjustment by determining the n value based on y (corresponding to Py) received from the controller 20. And these drivers 30 perform light quantity adjustment based on Formula 3.3.
  • FIG. 13A is a graph showing the relationship between the drive current and the total light amount Psum.
  • FIG. 13B is a graph showing the relationship between the drive current and the average light amount Pone.
  • the individual drivers 30 are configured to use individual functions (functions that differ depending on individual differences) during light amount adjustment. However, if Equation 4.1 is applied, each driver 30 uses the same function shown in FIG. 13B.
  • the individual drivers 30 can adjust the light amount by using any one of the above embodiments 1 to 3, for example, using the function of the drive current and the average light amount Pone.
  • the functions shown in FIGS. 13A and 13B are of the same type as the functions shown in FIG. 3, for example, but may be of the same type as the functions shown in FIG.
  • a function based on the average light amount Pone can be easily generated, and the total light amount can be adjusted with high accuracy by the function.
  • the average light amount for each light emitting unit 40 (for each driver 30) has been described.
  • the average light amount Pone for each light source 50 may be used.
  • N is at least 3.
  • each driver 30 changes the drive current of the light emitting unit 40, the time until settling is different. Therefore, in each driver 30 of the light source control device according to the present embodiment, the drive current switching start timing by each driver 30 is different.
  • the delay time is set to the drive current switching start timing by at least one of the drivers 30 so that the settling completion timings are simultaneous.
  • the luminance can be made constant even when there is a difference in function for each light emitting unit 40 as described above, and in particular, the white balance can be made constant (so as not to be distorted). Can).
  • the starting point of the delay time there are two major designs for the starting point of the delay time.
  • the starting point of the delay time there is a timing at which each driver 30 receives a target current value change command from the controller 20.
  • the controller 20 generates a synchronization signal for switching the drive current and each driver 30 receives the synchronization signal.
  • the delay time is set in advance when designing the light source control device.
  • the controller 20 In the latter (the other one), the controller 20 generates a synchronization signal after generating the change command.
  • FIG. 14A shows, as a comparative example, an example in which the drive current is changed (the predetermined current value is lowered) for light amount adjustment when there is no delay time.
  • FIG. 14B shows an example in which the settling completion timing is set almost simultaneously by setting a delay time in this embodiment.
  • a synchronization signal for example, a pulse signal
  • Each driver 30 receives the change command or the synchronization signal S by broadcast from the controller 20.
  • FIG. 14A shows a synchronization signal S for switching drive current, a current waveform Ca of one light emitting unit A, and a current waveform Cb of another light emitting unit B in order from the top of FIG. 14A.
  • the time from when each driver receives the synchronization signal S until the respective driver reaches a predetermined current value, that is, the settling time is different.
  • the settling time t1 of the light emitting unit A is shorter than the settling time t2 of the light emitting unit B.
  • each delay time is set to the two or more settling times so that the slowest settling time matches the settling times of the other two or more light emitting units. Is done.
  • the controller 20 transmits each delay time td as a known parameter to each driver 30 before adjusting the amount of light (for example, when the power is turned on).
  • each driver 30 stores each delay time td in advance by the time of factory shipment.
  • each driver 30 may previously store a time (for example, time t1 + td) to which the delay time is applied.
  • the time t2 is different for each driver 30 (for each light emitting unit 40).
  • three light emitting arrays of RGB are assumed as the light source 50 and at least three light emitting units 40.
  • the settling times of the light source 50R that generates red light and the light source 50B that generates blue light are substantially the same.
  • the settling time of the light source 50G that generates green light is slower (longer) than the settling times of the light sources 50R and 50B.
  • the settling times can be matched to such a problem, and the white balance can be maintained constant.
  • a plurality of different delay times may be set according to the amount of change before and after switching of the drive current (before and after determination of the drive value). That is, each driver 30 selectively uses a plurality of different switching start timings according to the amount of change. For example, when the increase amount is less than Iup [A], the delay time Ta [ms] can be set, and when the increase amount is IupI [A] or more, the delay time Tb [ms] can be set. Further, when the reduction amount is less than Idown [A], the delay time TcT [ms] can be set, and when it is equal to or greater than Idown [A], the delay Td [ms] can be set. Alternatively, the amount of change is not limited to two, and three or more steps may be set.
  • a controller configured to transmit a command value relating to adjustment of the light amount of at least one light emitting unit; Each of the transmitted command values is acquired and set for each light emitting unit, using a function of a drive value for driving the light emitting unit and the amount of light, and based on the command value, for each light emitting unit
  • a light source control device comprising: a plurality of drivers configured to respectively determine drive values.
  • the individual drivers constituting the plurality of drivers are configured to use a function approximated by a straight line as the function.
  • Each of the drivers that constitute the plurality of drivers is configured to use, as the function, a plurality of functions respectively set corresponding to a plurality of driving regions.
  • the individual driver is configured to use a function approximated by a plurality of linear regions set corresponding to a plurality of drive regions as a function approximated by the straight line.
  • the light source control device according to (2) or (4), The individual driver is configured to use the function with the straight line inclination, the reference light amount, and a reference drive value corresponding to the reference light amount as known parameters.
  • the light source control device (6)
  • the individual driver is configured to acquire or store in advance a calculation value based on the slope of the straight line and the reference light amount among the known parameters.
  • the light source control device (7)
  • the light source control device according to any one of (1) to (6),
  • the controller is configured to update the function based on a predetermined condition.
  • the light source control device according to any one of (1) to (7),
  • the controller is configured to broadcast the command value to the plurality of drivers.
  • the light source control device is: A plurality of first wavelength band light emitting drivers configured to respectively drive a plurality of light emitting sections that emit light in a first wavelength band among the light emitting sections; A plurality of second wavelength band light emitting drivers configured to drive a plurality of light emitting sections that emit light in a second wavelength range different from the first wavelength range among the light emitting sections,
  • the controller is configured to transmit a first command value to the plurality of first wavelength band light emission drivers and to transmit a second command value to the plurality of first wavelength band light emission drivers.
  • the light source control device includes a first light emitting unit and a second light emitting unit
  • the plurality of drivers are: A voltage between a reference potential in the reference line and a potential higher than the reference potential in the first line is generated, and the first light emitting unit connected between the reference line and the first line is driven.
  • a first driver configured to connect to the reference line and the first line; A voltage between the reference potential and a potential lower than the reference potential in the second line is generated to drive the second light emitting unit connected between the reference line and the second line.
  • a second driver that is connectable to the reference line and the second line.
  • the light source control device according to (10), The first driver and the second driver are configured to use a potential of zero volts as the reference potential.
  • the light source control device (12)
  • the light source control device (10), or (11),
  • the reference potential is set to a constant potential;
  • the second driver is configured to adjust the drive value by adjusting a potential on a side lower than the reference potential.
  • the first driver is configured to adjust the drive value by adjusting a potential on a side higher than the reference potential.
  • the light source control device according to any one of (10) to (13), A changing unit that changes a connection destination of the first light emitting unit so that the anode of the first light emitting unit is connected to the reference line and the cathode of the first light emitting unit is connected to the second line; Light source control device.
  • the light source control device according to any one of (10) to (13), A changing unit that changes a connection destination of the second light emitting unit so that the cathode of the second light emitting unit is connected to the reference line and the anode of the second light emitting unit is connected to the first line; Light source control device.
  • a light source control device further comprising: a resistance element provided on at least one of a line connected to the controller and a line connected to the plurality of drivers among the reference lines.
  • the individual drivers constituting the plurality of drivers are configured to use, as the function, a function of an average light amount obtained by dividing a total light amount of the plurality of light emitting units according to a driving value by the number of the light emitting units.
  • Light source control device 18.
  • the light source control device according to (1), The individual drivers constituting the plurality of drivers are configured to use different drive value switching start timings based on the command values.
  • the light source control device according to (18), A light source control device, wherein a delay time is set at a switching start timing of the drive value by at least one of the individual drivers.
  • the individual driver is configured to selectively use a plurality of different switching start timings according to a change amount of the driving value before and after switching of the driving value.
  • a command value related to adjustment of the light amount of at least one light emitting unit is transmitted by the controller, Each of the transmitted command values is obtained by a plurality of drivers, Based on the command value, the driving value for each light emitting unit is determined by the plurality of drivers based on the command value using a function of the driving value for driving the light emitting unit and the light amount set for each light emitting unit.
  • Light source control method Driving a first light emitting unit connected between the reference line and the first line by generating a voltage between a reference potential in the reference line and a potential in the first line that is higher than the reference potential.
  • a first driver configured to connect to the reference line and the first line; By generating a voltage between the reference potential and a potential lower than the reference potential in the second line, the second light emitting unit connected between the reference line and the second line is driven.
  • a second driver configured to be connectable to the reference line and the second line; And a controller unit that is connectable to the reference line, the first driver, and the second driver, and that is configured to control the first driver and the second driver.
  • the light source control device (22), The first driver and the second driver are configured to use a potential of zero volts as the reference potential.
  • the reference potential is set to a constant potential;
  • the second driver is configured to adjust the drive value by adjusting a potential on a side lower than the reference potential.
  • the first driver is configured to adjust the drive value by adjusting a potential on a side lower than the reference potential.
  • the light source control device according to any one of (22) to (25), A changing unit that changes a connection destination of the first light emitting unit so that the anode of the first light emitting unit is connected to the reference line and the cathode of the first light emitting unit is connected to the second line; Light source control device.
  • the light source control device according to any one of (22) to (25), A changing unit that changes a connection destination of the second light emitting unit so that the cathode of the second light emitting unit is connected to the reference line and the anode of the second light emitting unit is connected to the first line; Light source control device.
  • a light source control device further comprising: a resistance element provided on at least one of a line connected to the controller and a line connected to the plurality of drivers among the reference lines.
  • a voltage between a reference potential in the reference line and a potential higher than the reference potential in the first line is generated, and the first light emitting unit connected between the reference line and the first line is driven.
  • a first driver configured to be connectable to the reference line and the first line; A voltage is generated between the reference potential and a potential lower than the reference potential in the second line, and the second light emitting unit connected between the reference line and the second line is driven.
  • a second driver connectable to the reference line and the second line.
  • a first light emission connected between a reference line and a first line and driven by a current generated by a voltage generated between a reference potential in the reference line and a potential in the first line that is higher than the reference potential.
  • the second line connected between the reference line and the second line and driven by a current generated by a voltage generated between a reference potential in the reference line and a potential lower than the reference potential in the second line.
  • a light source unit comprising a light emitting unit.
  • a plurality of light emitting units A plurality of light emitting units; A light modulation element for modulating light from the plurality of light emitting units; A projection optical system for projecting modulated light obtained by being modulated by the light modulation element; A controller configured to transmit a command value relating to adjustment of the amount of light of each light emitting unit constituting the plurality of light emitting units; Each of the transmitted command values is acquired and set for each light emitting unit, using a function of a drive value for driving the light emitting unit and the amount of light, and based on the command value, for each light emitting unit
  • a projector comprising: a plurality of drivers each configured to determine a drive value; (32)
  • the plurality of light emitting units are: A first light emitting unit connected between the reference line and the first line; A second light emitting unit connected between the reference line and the second line,
  • the plurality of drivers are: A voltage between the reference potential in the reference line and a potential higher than the reference potential in
  • a plurality of light emitting units including a first light emitting unit connected between a reference line and a first line; and a second light emitting unit connected between the reference line and the second line;
  • a light modulation element for modulating light from the plurality of light emitting units;
  • a projection optical system for projecting modulated light obtained by being modulated by the light modulation element;
  • a voltage between the reference potential in the reference line and a potential higher than the reference potential in the first line is generated to drive the first light emitting unit, and the reference line and the first
  • a driver unit including a reference line and a second driver connected to the second line;
  • a projector comprising: a controller unit that is connectable to the reference line, the first driver, and the second driver, and that is configured to control the first driver and the second driver.

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  • Projection Apparatus (AREA)

Abstract

[Solution] L'invention concerne un dispositif de commande de source de lumière avec un dispositif de commande et une pluralité de pilotes. Le dispositif de commande est constitué de façon à transmettre une valeur d'instruction pour ajuster l'intensité lumineuse d'au moins une unité d'émission de lumière. Les pilotes de la pluralité de pilotes sont configurés de telle sorte que les pilotes permettent chacun d'acquérir la valeur d'instruction qui a été transmise, et au moyen d'une fonction pour une valeur d'entraînement à des fins d'entraînement de l'unité d'émission de lumière et de l'intensité de la lumière, que l'on a réglé pour chaque unité d'émission de lumière, permettent de déterminer la valeur d'entraînement pour chaque unité d'émission de lumière respective en fonction de la valeur d'instruction.
PCT/JP2016/001746 2015-04-30 2016-03-25 Dispositif de commande de source de lumière, procédé de commande de source de lumière, et projecteur WO2016174815A1 (fr)

Priority Applications (2)

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US15/565,989 US10168607B2 (en) 2015-04-30 2016-03-25 Light source control apparatus, light source control method, and projector
US16/193,175 US10509305B2 (en) 2015-04-30 2018-11-16 Light source control apparatus, light source control method, and projector

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2015-092552 2015-04-30
JP2015092552 2015-04-30
JP2015154780A JP2016213171A (ja) 2015-04-30 2015-08-05 光源制御装置、光源制御方法、およびプロジェクタ
JP2015-154780 2015-08-05

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US16/193,175 Continuation US10509305B2 (en) 2015-04-30 2018-11-16 Light source control apparatus, light source control method, and projector

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CN109634040A (zh) * 2019-01-23 2019-04-16 苏州佳世达光电有限公司 投影机及其驱动电路
CN111198470A (zh) * 2018-10-30 2020-05-26 中强光电股份有限公司 投影系统、驱动装置以及驱动方法
JP2021064487A (ja) * 2019-10-11 2021-04-22 パナソニックＩｐマネジメント株式会社 照明システム及び電力線通信機

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JP2014064436A (ja) * 2012-09-24 2014-04-10 Renesas Electronics Corp 電源装置
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JP2009252573A (ja) * 2008-04-08 2009-10-29 Seiko Epson Corp 光源システム、プロジェクタ、および表示装置
WO2011086682A1 (fr) * 2010-01-15 2011-07-21 Ｎｅｃディスプレイソリューションズ株式会社 Dispositif d'affichage par projection et procédé de commande de sources de lumière
JP2012227013A (ja) * 2011-04-20 2012-11-15 Panasonic Corp 照明システム
WO2012164788A1 (fr) * 2011-05-30 2012-12-06 パナソニック株式会社 Dispositif d'alimentation électrique
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111198470A (zh) * 2018-10-30 2020-05-26 中强光电股份有限公司 投影系统、驱动装置以及驱动方法
CN109634040A (zh) * 2019-01-23 2019-04-16 苏州佳世达光电有限公司 投影机及其驱动电路
JP2021064487A (ja) * 2019-10-11 2021-04-22 パナソニックＩｐマネジメント株式会社 照明システム及び電力線通信機
JP7304526B2 (ja) 2019-10-11 2023-07-07 パナソニックＩｐマネジメント株式会社 照明システム及び電力線通信機

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