Illumination device, illumination device control method, and projection display device

Abstract

A lighting device according to one embodiment of the present disclosure is provided with: a light source unit including one or a plurality of solid-state light sources; and a control unit for controlling the drive of the one or the plurality of solid-state light sources to control the brightness for a prescribed time from activation of the light source unit.

Description

[Technical Field]

[0001] The present disclosure relates to, for example, an illumination device that uses one or more solid-state light sources as a light source, a method for controlling an illumination device, and a projection display device including the same. [Background technology]

[0002] For example, Patent Document 1 discloses an image display device having a calculation unit that calculates a reference distance from the emission surface that serves as a criterion for determining the influence of the emitted light emitted from the projection unit, and a notification unit that notifies information regarding the influence of the emitted light based on the calculated reference distance. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2016 / 002119 Summary of the Invention

[0004] In recent years, the applications of projectors have expanded, and there is a demand for improved marketability.

[0005] It is desirable to provide a lighting device, a method for controlling a lighting device, and a projection display device that can improve marketability.

[0006] An illumination device according to an embodiment of the present disclosure includes a light source device including a light source unit having one or more solid-state light sources and a wavelength conversion element that converts light emitted from the one or more solid-state light sources into light of a different wavelength band and emits the converted light; and a control unit that controls the driving of the one or more solid-state light sources to control luminance for a predetermined period of time from the activation of the light source unit, where the luminance is the intensity of light emitted from the light source device, and the control unit has a power supply circuit that controls the amount of current supplied from the power supply circuit to the one or more solid-state light sources and pulse-width modulates the power supplied to the one or more solid-state light sources, thereby controlling the luminance for a predetermined period of time from the activation of the light source unit. , rated at Risk Group 2 or lower in IEC62471, and has a lower luminance than the luminance at the current value that indicates the laser oscillation threshold. Control to.

[0007] According to an embodiment of the present disclosure, there is provided a method for controlling an illumination device, comprising: a light source unit having one or more solid-state light sources; and a light source device including a wavelength conversion element that converts light emitted from the one or more solid-state light sources into light of a different wavelength band and emits the converted light; and, when the intensity of the light emitted from the light source device is defined as luminance, controlling the driving of the one or more solid-state light sources to maintain luminance for a predetermined time from activation of the light source unit. , rated at Risk Group 2 or lower in IEC62471, and has a lower luminance than the luminance at the current value that indicates the laser oscillation threshold. Control to.

[0008] A projection display device according to an embodiment of the present disclosure includes a light source device, an image generation optical system that generates image light by modulating light from the light source device based on an input video signal, and a projection unit that projects the projection light generated by the image generation optical system. The light source device installed in this projection display device has the same components as the illumination device according to the embodiment of the present disclosure.

[0009] In the lighting device according to an embodiment of the present disclosure, the method for controlling the lighting device according to an embodiment, and the projection display device according to an embodiment, the driving of one or more solid-state light sources of a light source unit constituting the light source device is controlled, and the luminance, which is the intensity of light emitted from the light source device, is controlled for a predetermined time from the start of the light source unit. , rated at Risk Group 2 or lower in IEC62471, and has a lower luminance than the luminance at the current value that indicates the laser oscillation threshold. This reduces the intensity of light emitted from the lighting device and the projection display device equipped with the lighting device for a certain period of time after startup. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a block diagram illustrating an example of a configuration of a projector according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a schematic diagram illustrating an example of the configuration of the projector illustrated in FIG. [Figure 3] 2 is a schematic diagram illustrating an example of the configuration of the light source device shown in FIG. [Figure 4] FIG. 10 is a diagram showing a change in luminance to explain the first control mode. [Figure 5] 10A and 10B are diagrams illustrating a projected image immediately after activation, illustrating the second control mode. [Figure 6] 10A and 10B are diagrams illustrating a projected image after a menu selection for explaining a second control mode. [Figure 7] FIG. 10 is a diagram showing a change in luminance to explain the third control mode. [Figure 8] 1. FIG. 4 is a schematic diagram illustrating another example of the configuration of the projector shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The following description is one specific example of the present disclosure, and the present disclosure is not limited to the following embodiment. Furthermore, the present disclosure is not limited to the arrangement, dimensions, dimensional ratios, etc. of each component shown in each drawing. The order of description is as follows. 1. Embodiment (Example of a projector having multiple control modes) 1-1.Projector configuration 1-2. Light source device control method 1-3. Actions and Effects 2. Modifications (other examples of projectors)

[0012] <1. Embodiment> FIG. 1 is a block diagram illustrating an example of the configuration of a projection display device (projector 1) according to an embodiment of the present disclosure. Projector 1 enlarges and projects a projection image (projected light) created by a display device smaller than the size of the image to be projected (projected image) onto a projection surface (e.g., screen 50) such as a wall. Note that the term "image" as used herein includes both still images and moving images. Projector 1 includes, for example, a light source device 10, an image generation system 20, a projection unit 30, and a control unit 40. Projector 1 of this embodiment has, for example, multiple control modes that control the driving of multiple solid-state light-emitting elements 112 (see FIG. 3) of a light source unit 110 (see FIG. 3) constituting light source device 10 to control the luminance (intensity of light emitted from light source device 10) for a predetermined period of time after the light source unit 110 is turned on.

[0013] (1-1. Projector configuration) As described above, the projector 1 includes the light source device 10, the image generation system 20, the projection unit 30, and the control unit 40. The image generation system 20 includes, for example, an illumination optical system 21 and an image forming unit 22, and the illumination optical system 21 and the image forming unit 22 correspond to a specific example of the "image generation optical system" of the present disclosure. The control unit 40 includes, for example, a signal processing unit 41, a control mode selection unit 42, and a power supply circuit 43.

[0014] FIG. 2 is a schematic diagram showing an example of the configuration of a reflective 3LCD type projector that performs light modulation using a reflective liquid crystal panel (LCD), as an example of the configuration of the projector 1.

[0015] 3 shows an example of the configuration of light source device 10. Light source device 10 has, for example, a light source unit 110, a phosphor wheel 120, a polarizing beam splitter (PBS) 131, a quarter-wave plate 132, and a condensing optical system 133. The above components that make up light source device 10 are arranged on the optical path of light (excitation light EL) emitted from light source unit 110 between light source unit 110 and phosphor wheel 120, in the order of PBS 131, quarter-wave plate 132, and condensing optical system 133 from the light source unit 110 side.

[0016] The light source unit 110 has, as a light source, for example, a plurality of solid-state light-emitting elements 112 that emit light (excitation light EL) in a predetermined wavelength band. The plurality of solid-state light-emitting elements 112 are arranged on the base unit 111 in, for example, an array.

[0017] The base 111 supports the plurality of solid-state light-emitting elements 112 and promotes the dissipation of heat generated by light emission from the plurality of solid-state light-emitting elements 112. For this reason, the base 111 is preferably formed using a material with high thermal conductivity, such as aluminum (Al), copper (Cu), or iron (Fe).

[0018] For example, semiconductor lasers (Laser Diodes: LDs) are used as the plurality of solid-state light emitting elements 112. Specifically, an LD that oscillates laser light (blue light) in a wavelength band corresponding to blue, for example, wavelengths of 400 nm to 470 nm, is used. Alternatively, light emitting diodes (Light Emitting Diodes: LEDs) may be used as the plurality of solid-state light emitting elements 112.

[0019] A plurality of lenses 113 are arranged above the plurality of solid-state light-emitting elements 112, one for each solid-state light-emitting element 112. The plurality of lenses 113 are, for example, collimating lenses, and adjust the laser light (excitation light EL) emitted from each of the plurality of solid-state light-emitting elements 112 to parallel light and emit the parallel light.

[0020] The phosphor wheel 120 is a wavelength conversion element that converts the excitation light EL into light (fluorescence FL) having a different wavelength band from that of the excitation light EL and emits the converted light. The phosphor wheel 120 has a phosphor layer 122 provided on a wheel substrate 121 that is rotatable around a rotation axis (for example, axis J123).

[0021] The wheel substrate 121 is for supporting the phosphor layer 122 and has, for example, a disk shape. The wheel substrate 121 preferably also functions as a heat dissipation member. For this reason, the wheel substrate 121 can be made of a metal material with high thermal conductivity. The wheel substrate 121 can also be made of a metal material or ceramic material that can be mirror-finished. This makes it possible to suppress a temperature rise in the phosphor layer 122 and improve the extraction efficiency of the fluorescence FL.

[0022] The phosphor layer 122 includes a plurality of phosphor particles, which are excited by the excitation light EL to emit light (fluorescence FL) in a wavelength band different from that of the excitation light EL. Specifically, the phosphor layer 122 includes phosphor particles that are excited by the blue light (excitation light EL) emitted from the light source unit 110 to emit fluorescence FL in a wavelength band corresponding to yellow. Examples of such phosphor particles include YAG (yttrium aluminum garnet)-based materials. The phosphor layer 122 may further include semiconductor nanoparticles such as quantum dots, organic dyes, etc. The phosphor layer 122 is formed, for example, in a plate shape and is made of, for example, a so-called ceramic phosphor or a binder-type phosphor. The phosphor layer 122 is continuously formed on the wheel substrate 121, for example, in the circumferential direction of rotation.

[0023] For example, a motor 123 is attached to the center of the wheel substrate 121. The motor 123 is for driving the wheel substrate 121 to rotate at a predetermined rotation speed. This allows the phosphor wheel 120 to rotate, and the irradiation position of the excitation light EL on the phosphor layer 122 changes (moves) over time at a speed corresponding to the rotation speed. This makes it possible to avoid deterioration of the phosphor particles due to irradiation of the same position on the phosphor layer 122 with excitation light for a long period of time.

[0024] The PBS 131 separates the excitation light EL incident from the light source unit 110 and the combined light (for example, white light Lw) incident from the phosphor wheel 120 side. Specifically, the PBS 131 emits the excitation light EL incident from the light source unit 110 toward the quarter-wave plate 132. The PBS 131 also reflects the white light Lw incident from the phosphor wheel 120 side after passing through the focusing optical system 133 and the quarter-wave plate 132 toward the illumination optical system 21.

[0025] The quarter-wave plate 132 is a phase difference element that generates a phase difference of π / 2 with respect to the incident light, and converts linearly polarized light into circularly polarized light when the incident light is linearly polarized, and converts circularly polarized light into linearly polarized light when the incident light is circularly polarized. The linearly polarized excitation light EL incident from the PBS 131 is converted into circularly polarized excitation light EL by the quarter-wave plate 132. In addition, the circularly polarized excitation light component contained in the white light Lw incident from the phosphor wheel 120 side is converted into linearly polarized light by the quarter-wave plate 132.

[0026] The focusing optical system 133 focuses the excitation light EL incident from the quarter-wave plate 132 to a predetermined spot diameter and emits the light toward the phosphor wheel 120. The focusing optical system 133 also converts the white light Lw incident from the phosphor wheel 120 side into parallel light and emits the parallel light toward the quarter-wave plate 132. The focusing optical system 133 may be configured, for example, with a single collimating lens, or may be configured to convert the incident light into parallel light using multiple lenses.

[0027] The optical member that separates the excitation light EL incident from the light source unit 110 and the white light Lw incident from the phosphor wheel 120 side is not limited to the PBS 131, and any optical member can be used as long as it is configured to enable the above-described light separation operation. Furthermore, the light source device 10 does not need to have all of the optical members shown in Fig. 3, and may include other optical members. For example, the light source device 10 may include multiple phosphor wheels.

[0028] The illumination optical system 21 includes a PS converter 211, dichroic mirrors 212 and 216, and total reflection mirrors 213, 214, and 215, arranged along the optical axis of the white light Lw emitted from the light source device 10. The image forming unit 22 includes PBSs 221, 222, and 223, reflective liquid crystal panels 224R, 224G, and 224B, and a cross prism 225 as color combining means. The projection unit 30 projects the combined light emitted from the cross prism 225 toward the screen 50.

[0029] The PS converter 211 functions to polarize and transmit the white light Lw incident from the light source device 10. Here, the PS converter 211 transmits S-polarized light as is and converts P-polarized light into S-polarized light.

[0030] The dichroic mirror 212 has a function of separating the white light Lw transmitted through the PS converter 211 into blue light B and other colored light (red light R and green light G). The total reflection mirror 213 reflects the colored light (red light R and green light G) transmitted through the dichroic mirror 212 toward the total reflection mirror 215, and the total reflection mirror 215 reflects the reflected light (red light R and green light G) from the total reflection mirror 213 toward the dichroic mirror 216. The dichroic mirror 216 has a function of separating the colored light (red light R and green light G) incident from the total reflection mirror 215 into red light R and green light G. The total reflection mirror 214 reflects the blue light B separated by the dichroic mirror 212 toward the PBS 223.

[0031] The PBSs 221, 222, and 223 are disposed along the optical paths of the red light R, green light G, and blue light B, respectively. The PBSs 221, 222, and 223 have polarization separation surfaces 221A, 222A, and 223A, respectively, which function to separate the incident color light into two polarized components that are orthogonal to each other. The polarization separation surfaces 221A, 222A, and 223A reflect one polarized component (for example, the S polarized component) and transmit the other polarized component (for example, the P polarized component).

[0032] The reflective liquid crystal panels 224R, 224G, and 224B are configured to receive colored light (red light R, green light G, and blue light B) of predetermined polarization components (for example, S-polarization components) separated by the polarization separation surfaces 221A, 222A, and 223A, respectively. The reflective liquid crystal panels 224R, 224G, and 224B are driven in accordance with drive voltages applied based on video signals, and function to modulate the incident light and reflect the modulated colored light (red light R, green light G, and blue light B) toward the PBSs 221, 222, and 223, respectively.

[0033] The cross prism 225 combines colored light (red light R, green light G, and blue light B) of predetermined polarization components (e.g., P polarization components) emitted from the reflective liquid crystal panels 224R, 224G, and 224B and transmitted through the PBSs 221, 222, and 223, and emits the combined light toward the projection unit 30.

[0034] The projection unit 30 is configured to include, for example, a plurality of lenses and the like, and projects the combined light (projection light) incident from the image forming unit 22 onto the screen 50 after enlarging the light.

[0035] As described above, the control unit 40 includes the signal processing unit 41, the control mode selection unit 42, and the power supply circuit 43. The control unit 40 further includes, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory) (none of which are shown). The CPU reads out a control program stored in the ROM, loads it into the RAM, and executes the steps of the program on the RAM. The control unit 40 controls the overall operation of the projector 1 by the CPU executing the program.

[0036] The signal processing unit 41 performs various signal processing on a video signal input from an external device such as a computer, DVD player, or TV tuner. The signal processing unit 41 performs image resizing, gamma adjustment, color adjustment, etc., by, for example, correcting characteristics of the video signal, amplifying it, etc., and also decomposes the video signal into R, G, and B image data. The signal processing unit 41 also generates optical modulation signals for driving the reflective liquid crystal panels 224R, 224G, and 224B for each color light, and supplies them to a drive unit (not shown) of the image forming unit 22.

[0037] A signal (control mode designation signal) designating one of a plurality of control modes (described later) is further input from a control mode selection unit 42 to the signal processing unit 41. The signal processing unit 41 generates a signal (drive current setting signal) for setting a drive current based on the control mode designation signal input from the control mode selection unit 42, and supplies the signal to the power supply circuit 43.

[0038] A selection signal for selecting one of a plurality of projection modes (control modes) by, for example, a user is input to the control mode selection unit 42. The control mode selection unit 42 generates a signal for specifying one of the control modes (hereinafter, referred to as a control mode specification signal) and supplies it to the signal processing unit 41.

[0039] The power supply circuit 43 supplies a drive current based on the drive current setting signal input from the signal processing unit 41 to the light source device 10 (specifically, the plurality of solid-state light emitting elements 12 of the light source unit 110).

[0040] (1-2. Control method of light source device) In recent years, with the widespread use of light source devices and lighting equipment that use solid-state light-emitting elements such as LDs and LEDs as light sources, there has been growing interest in assessing the effects of such light on the human body. The IEC62471 series (JIS C7550) has been standardized as a method for assessing the effects of light radiation on the human body. IEC62471 divides the radiation into four groups, as shown in Table 1 below.

[0041] [Table 1]

[0042] In the projector 1 of this embodiment, the drive of the plurality of solid-state light emitting elements 112 constituting the light source device 10 is controlled so that the brightness (intensity of light emitted from the light source device 10) for a predetermined time from the start of the light source unit 110 is maintained at a predetermined brightness or less, for example, a brightness of Risk Group 2 (RG2) or less. Here, the "predetermined time" refers to the time within which a user (human) can react based on their aversion reaction, and although this reaction time differs from person to person, it is considered that a reaction can be made within 0.25 seconds. In this embodiment, it is set to, for example, 1 second or more, which allows the user to react with ease.

[0043] In the projector 1, the control mode selection unit has a plurality of control modes, and the luminance for a predetermined time from the activation of the light source unit 110 is controlled in accordance with the user's selection. The luminance for a predetermined time from the activation of the light source unit 110 is controlled, for example, by supplying a drive current based on a drive current setting signal input from the signal processing unit 41 to the plurality of solid-state light-emitting elements 112. Alternatively, the luminance is controlled by a control signal supplied from the power supply circuit 43 that performs pulse width modulation (PWM) control on the power supplied to the plurality of solid-state light-emitting elements 112 of the light source unit 110.

[0044] The plurality of control modes include, for example, the following three control modes (first control mode, second control mode, and third control mode).

[0045] 4 shows the change in luminance of the light source device 10 over a predetermined time period from the start of the light source unit 110 in the first control mode. A0, A1, A1', and A2 on the horizontal axis (time) are plotted with the start point (A0) being the time when the light source device 10 is started, A1 being the time when the multiple solid-state light emitting elements 112 of the light source unit 110 are turned on, A1' being the time when, for example, mute is released in the projector 1, and A2 being the time when the maximum luminance (for example, luminance evaluated as Risk Group 3 (RG3)) or the set luminance is reached thereafter.

[0046] In the first control mode, the luminance value is 0 during the period (A0-A1) from when the light source device 10 is turned on until the multiple solid-state light emitting elements 112 of the light source unit 110 are turned on, and during the period (A1-A1') from when the multiple solid-state light emitting elements 112 are turned on until mute is released, a luminance value of, for example, approximately 1000 ls is maintained. Thereafter, for a predetermined time (A1'-A2) from when mute is released, the luminance of the light source device 10 gradually increases as shown in FIG. 4, and becomes constant after reaching the maximum luminance (for example, the luminance evaluated as Risk Group 3 (RG3)) or the set luminance.

[0047] Here, "activation of the light source unit" in the present disclosure refers to the time (A1) when the plurality of solid-state light emitting elements 112 are turned on, the time (A1') when muting is released, or the period (A1-A1') therebetween. In other words, the brightness value at this time (A1, A1') or the period (A1-A1') corresponds to the "first brightness value" in the present disclosure, and the set brightness corresponds to the "second brightness value" in the present disclosure. Furthermore, the time (A1'-A2) from when muting is released until the set brightness is reached corresponds to the "predetermined time" in the present disclosure.

[0048] Incidentally, in the projector 1, the light source device 10 is in an on state, while the reflective liquid crystal panels 224R, 224G, and 224B are in an off state until the mute is released. At this time, no light is incident on the display device (the reflective liquid crystal panels 224R, 224G, and 224B), and a black screen is displayed on the screen 50 (screen muted). After the mute is released, an image (projected image) based on the video signal supplied from the signal processing unit 41 is created by the display device, and the projected image (projected light) is projected onto the screen 50. Note that in the projector 1, signal switching and channel switching also correspond to the above-mentioned mute release.

[0049] Furthermore, in the present embodiment, the luminance when the plurality of solid-state light-emitting elements 112 of the light source unit 110 are turned on is controlled by controlling the amount of current supplied from the power supply circuit 43 to the plurality of solid-state light-emitting elements 112, and also by pulse width modulation (PWM) control of the power supplied to the plurality of solid-state light-emitting elements 112 of the light source unit 110. As a result, the luminance when the plurality of solid-state light-emitting elements 112 of the light source unit 110 are turned on can be set to a value lower than the laser oscillation threshold of the plurality of solid-state light-emitting elements 112, for example, a luminance classified into a lower risk group in the above-mentioned IEC 62471.

[0050] 5 and 6 illustrate the second control mode, showing an example of a projection image projected onto the screen 50 by the projector 1. In the second control mode, the light source unit 110 is started at a luminance equal to or lower than Risk Group 2 (RG2), and then switched to maximum luminance (e.g., luminance evaluated as Risk Group 3 (RG3)) or a set luminance by a user operation.

[0051] Specifically, the luminance at the time of startup of the light source unit 110 (for example, A1 or A1' or A1'-A2 in FIG. 4) is set to Risk Group 2 (RG2) or lower, and a menu (On Screen Display: OSD) screen is displayed on the projection image as shown in FIG. 5. This menu screen does not disappear unless, for example, the user presses "OK" on the remote control or inputs a predetermined command. When the user presses "OK" on the remote control or inputs a predetermined command, the luminance of the light source unit 110 becomes maximum luminance (for example, luminance evaluated as Risk Group 3 (RG3)) or the set luminance, and a high-luminance projection image is projected onto the screen 50 as shown in FIG. 6.

[0052] It is preferable that the brightness of the light source unit 110 after the user presses "OK" on the remote control or inputs a specified command gradually increases, for example, from the brightness of risk group 2 (RG2) to the brightness of risk group 3 (RG3), as in the first control mode, but this is not limited to this.

[0053] Furthermore, in the projector 1, the brightness of the light source unit 110 at startup varies depending on the projection conditions (for example, the type of lens (projection lens) of the projection unit 30) even for the same risk group 2 (RG2). For this reason, it is preferable to make the brightness of the light source unit 110 at startup variable. This allows the light emitted from the projector 1 to be adjusted to a desired intensity. This further reduces the occurrence of risks that users may be exposed to, improving marketability.

[0054] 7 shows the change in luminance of the light source device 10 over a predetermined time period from the activation of the light source unit 110 in the third control mode. The third control mode is a mode in which the plurality of solid-state light-emitting elements 112 of the light source unit 110 are constantly lit at a luminance below the maximum luminance (for example, luminance below the risk group (RG2)), and is particularly useful when the user includes a target that requires special attention, such as a child.

[0055] In the third control mode, for example, similar to the first control mode, the luminance value is 0 during the period (A0-A1) from when the light source device 10 is turned on until the plurality of solid-state light emitting elements 112 of the light source unit 110 are turned on, and during the period (A1-A1') from when the plurality of solid-state light emitting elements 112 are turned on until mute is released, a luminance value classified into a lower risk group is maintained as described above. Thereafter, for a predetermined time (A1'-A2) from the release of mute, the luminance value of the light source device 10 gradually increases to, for example, the luminance of the risk group (RG2), as shown in FIG. 7, and then remains constant.

[0056] In the third control mode, similarly to the second control mode, it is preferable to make it possible to change the brightness of the light source unit 110 at startup depending on the projection conditions (for example, the type of lens (projection lens) of the projection unit 30). Furthermore, when the third control mode is enabled, it is preferable to provide a limiter so that the brightness of the light source unit 110 does not become higher than the set light amount (for example, risk group (RG2)) under any circumstances. This further reduces the occurrence of risks that the user may be exposed to, compared to the first control mode and the second control mode, and further improves marketability.

[0057] This third control mode can be released, for example, by a qualified person inputting a predetermined command. Alternatively, the third control mode can be released, for example, by installing the projector 1 at a position higher than the height of the user (for example, 3 m or higher) to prevent the user from entering an area (hazard zone) where the projection light projected from the projector 1 may affect the human body.

[0058] The above describes the multiple control modes (first control mode, second control mode, and third control mode) of the light source device 10 that constitutes the projector 1. However, for example, when dynamic laser control is enabled in a high dynamic projector, it is preferable to give priority to the value with the smaller laser output.

[0059] (1-3. Actions and Effects) In light source device 10 of the present embodiment, the drive of a plurality of solid-state light emitting elements 112 constituting light source unit 110 is controlled so that the luminance of light source device 10 for a predetermined time from the start of light source unit 110 is maintained at a luminance value equal to or lower than Risk Group 2 (RG2) in IEC 62471. This makes it possible to suppress the light emitted from the illumination device and the projection display device including the same for a certain time from the start to a desired intensity (for example, a luminance value classified into a lower risk group).

[0060] As a result, the light source device 10 of the present embodiment and the projector 1 including the same are easy to use for users, and the marketability can be improved.

[0061] In the present embodiment, the luminance of the light source device 10 is controlled in a plurality of control modes (first control mode, second control mode, and third control mode). Specifically, in the first control mode, the luminance of the light source device 10 is gradually increased to a maximum luminance (e.g., a luminance evaluated as Risk Group 3 (RG3)) or a set luminance within a predetermined time period from the activation of the light source unit 110. In the second control mode, the light source unit 110 is activated at a luminance equal to or lower than Risk Group 2 (RG2), and then switched to a maximum luminance (e.g., a luminance evaluated as Risk Group 3 (RG3)) or a set luminance by a user operation. In the third control mode, the set luminance is set to or lower than Risk Group 2 (RG2), and the projector 1 is always illuminated at a luminance equal to or lower than Risk Group 2 (RG2). This allows the user to select the luminance of the projector 1 depending on the usage environment. This further improves the merchantability of the light source device 10 and the projector 1 including the same.

[0062] Furthermore, in this embodiment, the amount of current supplied from the power supply circuit 43 to the plurality of solid-state light-emitting elements 112 of the light source unit 110 is controlled, and the power supplied to the plurality of solid-state light-emitting elements 112 is pulse-width modulated, so that when the light source unit 110 is started up, that is, when the plurality of solid-state light-emitting elements 112 are turned on, the brightness can be set to a brightness (for example, 1000 lm or less) lower than the laser oscillation threshold of the plurality of solid-state light-emitting elements 112. This makes it possible to further improve the marketability of the light source device 10 and the projector 1 including the same.

[0063] Next, a modification of the above embodiment will be described. In the following, the same components as those in the above embodiment will be given the same reference numerals, and the description thereof will be omitted as appropriate.

[0064] <2. Modifications> 8 is a schematic diagram showing an example of the configuration of a projection display device (projector 2) according to a modified example of the present disclosure. Projector 2 is a transmissive 3LCD projector that performs light modulation using a transmissive liquid crystal panel (LCD), and is configured to include, for example, a light source device 10, an illumination optical system 61 and an image forming unit 62 that constitute an image generation system, and a projection unit 30.

[0065] The illumination optical system 61 includes, for example, an integrator element 611 , a polarization conversion element 612 , and a condenser lens 613 .

[0066] The integrator element 611 as a whole has the function of adjusting the incident light irradiated from the light source device 10 onto the polarization conversion element 612 into a uniform luminance distribution. The integrator element 611 includes a first fly's eye lens 611A having a plurality of microlenses arranged two-dimensionally, and a second fly's eye lens 611B having a plurality of microlenses arranged so as to correspond one to each of the microlenses.

[0067] Light (white light Lw) incident on the integrator element 611 from the light source device 10 is split into multiple beams by the microlenses of the first fly-eye lens 611A, and each beam is focused on a corresponding microlens in the second fly-eye lens 611B. Each microlens of the second fly-eye lens 611B functions as a secondary light source, and irradiates multiple parallel beams of light with uniform brightness onto the polarization conversion element 612 as incident light.

[0068] The polarization conversion element 612 has a function of aligning the polarization state of the incident light that is incident via the integrator element 611 etc. The polarization conversion element 612 emits light including blue light B, green light G, and red light R toward the condenser lens 613 via, for example, a lens or the like arranged on the output side of the light source device 10.

[0069] The illumination optical system 61 further includes dichroic mirrors 614A and 614B, mirrors 615A, 615B, and 615C, relay lenses 616A and 616B, and field lenses 617A, 617B, and 617C.

[0070] The image forming section 62 has transmission type liquid crystal panels 621 A, 621 B, and 621 C and a dichroic prism 662 .

[0071] The dichroic mirrors 614A and 614B have the property of selectively reflecting colored light in a predetermined wavelength band and transmitting light in other wavelength bands. For example, the dichroic mirror 614A selectively reflects red light R. The dichroic mirror 614B selectively reflects green light G out of the green light G and blue light B that have passed through the dichroic mirror 614A. The remaining blue light B passes through the dichroic mirror 614B. This separates the white light Lw emitted from the light source device 10 into a plurality of different colored lights (red light R, green light G, and blue light B).

[0072] The separated red light R is reflected by mirror 615A, passes through field lens 617A to be collimated, and then enters transmissive liquid crystal panel 621A for modulating the red light. Green light G is passed through field lens 617B to be collimated, and then enters transmissive liquid crystal panel 621B for modulating the green light. Blue light B passes through relay lens 616A, is reflected by mirror 615B, and then passes through relay lens 616B to be reflected by mirror 615C. Blue light B reflected by mirror 615C is passed through field lens 617C to be collimated, and then enters transmissive liquid crystal panel 621C for modulating the blue light B.

[0073] The transmissive liquid crystal panels 621A, 621B, and 621C are electrically connected to a signal source (e.g., a PC, etc.) (not shown) that supplies a video signal containing image information. The transmissive liquid crystal panels 621A, 621B, and 621C modulate the incident light for each pixel based on the supplied video signals of red light R, green light G, and blue light B, respectively, to generate a red image, a green image, and a blue image, respectively. The modulated light of each color (formed image) enters a dichroic prism 662 and is combined.

[0074] The dichroic prism 662 combines the light of each color incident from three directions and outputs the combined light toward the projection unit 30.

[0075] The projection unit 30 is configured to include, for example, a plurality of lenses and the like, and projects the combined light (projection light) incident from the image forming unit 62 onto the screen 50 after enlarging the light.

[0076] Although the present technology has been described above with reference to the embodiments and modifications, the present technology is not limited to the above embodiments and can be modified in various ways. For example, a projection display device according to the present technology may be configured as a device other than the above-described projectors 1 and 2. For example, while the above-described projectors 1 and 2 use a reflective liquid crystal panel or a transmissive liquid crystal panel as a light modulation element, the present technology may also be applied to a projector using a digital micro-mirror device (DMD) or the like.

[0077] Furthermore, the light source device 10 according to the present technology may be used in devices other than projection display devices. For example, the light source device 10 according to the present disclosure may be used for lighting purposes, and may also be applicable to, for example, automobile headlamps and light sources for lighting up.

[0078] The effects described here are not necessarily limited to those described above, and may be any of the effects described in this disclosure.

[0079] The present disclosure can also be configured as follows. According to the present technology configured as follows, the drive of one or more solid-state light sources constituting the light source unit is controlled to control the brightness for a predetermined time from the start of the light source unit, so that, for example, the light irradiated from the illumination device and the projection display device equipped therewith can be kept below a desired intensity for a certain time from the start of the illumination device. This makes it possible to improve the merchantability of the product. (1) a light source unit having one or more solid-state light sources; a control unit that controls the driving of the one or more solid-state light sources to control the luminance for a predetermined time from the start of the light source unit; A lighting device comprising: (2) the control unit has a power supply circuit, The lighting device according to (1), wherein the amount of current supplied from the power supply circuit to the one or more solid-state light sources is controlled, and the brightness is controlled for a predetermined time from the start of the light source unit by pulse width modulation control of the power supplied to the one or more solid-state light sources. (3) The lighting device according to (1) or (2), wherein the control unit has a plurality of control modes. (4) The lighting device according to (3), wherein the control unit has, as the plurality of control modes, a first control mode in which the brightness is gradually increased from a first brightness value to a second brightness value within a predetermined time from the activation of the light source unit. (5) The lighting device according to (3) or (4), wherein the control unit has, as the plurality of control modes, a second control mode in which the control unit starts the light source unit at a third brightness value and then increases the brightness to a second brightness higher than the third brightness value in response to a user operation. (6) The lighting device according to any one of (3) to (5), wherein the control unit has, as the plurality of control modes, a third control mode in which the light source unit is driven at a value less than a maximum brightness of the light source unit after a predetermined time has elapsed since the light source unit was started. (7) The lighting device according to any one of (1) to (6), wherein the luminance immediately after activation of the light source unit is 1000 lm or less. (8) The lighting device according to any one of (1) to (7), wherein the predetermined time is one second or more from the start of the light source unit. (9) The lighting device according to any one of (1) to (8), wherein the one or more solid-state light sources are semiconductor lasers or light-emitting diodes. (10) The drive of one or more solid-state light sources constituting the light source unit is controlled to control the brightness for a predetermined period of time from the start of the light source unit. A method for controlling a lighting device. (11) The method for controlling an illumination device according to (10), wherein the luminance is gradually increased from a first luminance value to a second luminance value during a predetermined time period after activation of the light source unit. (12) The method for controlling a lighting device according to (10), wherein after starting the light source unit at a third brightness value, the brightness is increased to a second brightness higher than the third brightness value by a user operation. (13) The method for controlling an illumination device according to (10), wherein the light source unit is constantly driven at a value less than a maximum luminance of the light source unit after a predetermined time has elapsed since the light source unit was activated. (14) The control method for a lighting device according to any one of (10) to (13), wherein the luminance is controlled for a predetermined time from the start of the light source unit by controlling the amount of current supplied to the one or more solid-state light sources and controlling the power supplied to the one or more solid-state light sources through pulse width modulation control. (15) a light source device; an image generating optical system that generates image light by modulating light from the light source device based on an input video signal; a projection unit that projects projection light generated by the image generation optical system, The light source device is a light source unit having one or more solid-state light sources; a control unit that controls the driving of the one or more solid-state light sources to control the luminance for a predetermined time from the start of the light source unit; A projection display device having the above.

[0080] The present disclosure can also be configured as follows. According to the present technology configured as follows, the drive of one or more solid-state light sources constituting the light source unit is controlled to control the brightness for a predetermined time from the start of the light source unit, so that, for example, the light irradiated from the illumination device and the projection display device equipped therewith can be kept below a desired intensity for a certain time from the start of the illumination device. This makes it possible to improve the merchantability of the product. (1) a light source device including a light source unit having one or more solid-state light sources and a wavelength conversion element that converts light emitted from the one or more solid-state light sources into light of a different wavelength band and emits the light; a control unit that controls the driving of the one or more solid-state light sources to control the luminance for a predetermined time from the start of the light source unit, the luminance is the intensity of light emitted from the light source device, the control unit has a power supply circuit, The amount of current supplied from the power supply circuit to the one or more solid-state light sources is controlled, and the power supplied to the one or more solid-state light sources is pulse-width modulated to maintain the brightness for a predetermined time from the start of the light source unit. , rated at Risk Group 2 or lower in IEC62471, and has a lower luminance than the luminance at the current value that indicates the laser oscillation threshold. to control Lighting equipment. (2) The lighting device according to (1), wherein the control unit has a plurality of control modes. (3) The lighting device described in (2), wherein the control unit has, as the plurality of control modes, a first control mode in which the brightness is gradually increased from a first brightness value to a second brightness value within a predetermined time from the start of the light source unit. (4) The lighting device according to (2) or (3), wherein the control unit has, as one of the plurality of control modes, a second control mode in which the control unit starts the light source unit at a third brightness value and then increases the brightness to a second brightness higher than the third brightness value in response to a user operation. (5) The lighting device according to any one of (2) to (4), wherein the control unit has, as one of the plurality of control modes, a third control mode in which the light source unit is driven at a value less than a maximum brightness of the light source unit after a predetermined time has elapsed since the light source unit was started. (6) The lighting device according to any one of (1) to (5), wherein the luminance immediately after activation of the light source unit is 1000 lm or less. (7) The lighting device according to any one of (1) to (6), wherein the predetermined time is one second or more from the start of activation of the light source unit. (8) The lighting device according to any one of (1) to (7), wherein the one or more solid-state light sources are semiconductor lasers or light-emitting diodes. (9) a light source device including a light source unit having one or more solid-state light sources and a wavelength conversion element that converts light emitted from the one or more solid-state light sources into light of a different wavelength band and emits the light; When the intensity of the light emitted from the light source device is defined as luminance, The one or more solid-state light sources are controlled to maintain the brightness for a predetermined time from the start of the light source unit. , rated at Risk Group 2 or lower in IEC62471, and has a lower luminance than the luminance at the current value that indicates the laser oscillation threshold. to control A method for controlling a lighting device. (10) The method for controlling an illumination device according to (9), wherein the luminance is gradually increased from a first luminance value to a second luminance value during a predetermined time period after activation of the light source unit. (11) The method for controlling a lighting device according to (9), wherein after starting the light source unit at a third brightness value, the brightness is increased to a second brightness higher than the third brightness value by a user operation. (12) The method for controlling an illumination device according to (9), wherein the light source unit is constantly driven at a value less than a maximum luminance of the light source unit after a predetermined time has elapsed since the light source unit was activated. (13) The control method for a lighting device according to any one of (9) to (12), wherein the luminance is controlled for a predetermined time from the start of the light source unit by controlling the amount of current supplied to the one or more solid-state light sources and controlling the power supplied to the one or more solid-state light sources through pulse width modulation control. (14) A lighting device; an image generating optical system that generates image light by modulating light from the illumination device based on an input video signal; a projection unit that projects projection light generated by the image generation optical system, The lighting device includes: a light source device including a light source unit having one or more solid-state light sources and a wavelength conversion element that converts light emitted from the one or more solid-state light sources into light of a different wavelength band and emits the light; a control unit that controls the driving of the one or more solid-state light sources to control the luminance for a predetermined time from the start of the light source unit, the luminance is the intensity of light emitted from the light source device, the control unit has a power supply circuit, The amount of current supplied from the power supply circuit to the one or more solid-state light sources is controlled, and the power supplied to the one or more solid-state light sources is pulse-width modulated to maintain the brightness for a predetermined time from the start of the light source unit. , and is evaluated as Risk Group 2 or lower in IEC62471, at a current value lower than the laser oscillation threshold. Control Projection type display device.

[0081] Those skilled in the art will recognize that various modifications, combinations, subcombinations, and variations may occur depending on design requirements and other factors, and are intended to be within the scope of the appended claims and their equivalents.

Claims

1. a light source device including a light source unit having one or more solid-state light sources and a wavelength conversion element that converts light emitted from the one or more solid-state light sources into light of a different wavelength band and emits the light; a control unit that controls the driving of the one or more solid-state light sources to control the luminance for a predetermined time from the start of the light source unit, the luminance is the intensity of light emitted from the light source device, the control unit has a power supply circuit, By controlling the amount of current supplied from the power supply circuit to the one or more solid-state light sources and controlling the pulse width modulation of the power supplied to the one or more solid-state light sources, the luminance for a predetermined time from the start of the light source unit is controlled to a luminance lower than the luminance at a current value indicating a laser oscillation threshold that is evaluated as being in risk group 2 or lower in IEC 62471. Lighting equipment.

2. The lighting device of claim 1 , wherein the control unit has a plurality of control modes.

3. 3. The lighting device according to claim 2, wherein the control unit has, as the plurality of control modes, a first control mode in which the luminance is gradually increased from a first luminance value to a second luminance value over a predetermined time period from activation of the light source unit.

4. 4. The lighting device according to claim 3, wherein the control unit includes, as the plurality of control modes, a second control mode in which the control unit starts the light source unit at a third luminance value and then increases the luminance to a second luminance higher than the third luminance value in response to a user operation.

5. The lighting device according to claim 3 , wherein the control unit has, as the plurality of control modes, a third control mode in which the light source unit is driven at a value less than a maximum luminance of the light source unit after a predetermined time has elapsed since activation of the light source unit.

6. The lighting device according to claim 1 , wherein the luminance immediately after activation of the light source unit is 1000 lm or less.

7. The lighting device according to claim 1 , wherein the predetermined time is one second or more from the start of activation of the light source unit.

8. The lighting device of claim 1 , wherein the one or more solid-state light sources are semiconductor lasers or light-emitting diodes.

9. a light source device including a light source unit having one or more solid-state light sources and a wavelength conversion element that converts light emitted from the one or more solid-state light sources into light of a different wavelength band and emits the light; When the intensity of the light emitted from the light source device is defined as luminance, The driving of the one or more solid-state light sources is controlled, and the luminance for a predetermined time from the activation of the light source unit is controlled to a luminance lower than the luminance at a current value indicating a laser oscillation threshold, which is evaluated to be in risk group 2 or lower in IEC 62471. A method for controlling a lighting device.

10. The method for controlling a lighting device according to claim 9 , wherein the luminance is gradually increased from a first luminance value to a second luminance value during a predetermined time period after activation of the light source unit.

11. The method for controlling a lighting device according to claim 9 , further comprising: starting the light source unit at a third luminance value, and then increasing the luminance to a second luminance higher than the third luminance value in response to a user operation.

12. The method for controlling a lighting device according to claim 9 , wherein the light source unit is constantly driven at a value less than a maximum luminance of the light source unit after a predetermined time has elapsed since the light source unit was activated.

13. 10. The method for controlling a lighting device according to claim 9, further comprising controlling the amount of current supplied to the one or more solid-state light sources and controlling pulse width modulation of power supplied to the one or more solid-state light sources, thereby controlling the luminance for a predetermined time from startup of the light source unit.

14. A lighting device; an image generating optical system that generates image light by modulating light from the illumination device based on an input video signal; a projection unit that projects projection light generated by the image generation optical system, The lighting device includes: a light source device including a light source unit having one or more solid-state light sources and a wavelength conversion element that converts light emitted from the one or more solid-state light sources into light of a different wavelength band and emits the light; a control unit that controls the driving of the one or more solid-state light sources to control the luminance for a predetermined time from the start of the light source unit, the luminance is the intensity of light emitted from the light source device, the control unit has a power supply circuit, By controlling the amount of current supplied from the power supply circuit to the one or more solid-state light sources and controlling the pulse width modulation of the power supplied to the one or more solid-state light sources, the luminance for a predetermined time from the start of the light source unit is controlled to a luminance lower than the luminance at a current value indicating a laser oscillation threshold that is evaluated as being in risk group 2 or lower in IEC 62471. Projection type display device.

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