lighting system

Abstract

To appropriately dim a lighting device in a projection area and a non-projection area of ​​a projection display device. [Solution] The lighting system 100 is located in a space SA equipped with a projection display device 10 and an illumination device 20, which communicate with each other. The projection display device 10 projects an image onto a projection surface 10s of the space SA. The illumination device 20 is fixed to one surface S1 of the space SA and has multiple light-emitting areas LA that can be independently dimmed. Of the multiple light-emitting areas LA, the light-emitting area LA that is closest to the projection surface 10s is designated as the first light-emitting area LA1, and the remaining areas are designated as second light-emitting areas LA2. Upon receiving either a start-up signal for the projection display device 10 or an instruction signal to project onto the projection surface 10s, the brightness of the first light-emitting area LA1 is made lower than the brightness of the second light-emitting area LA2, and the brightness difference between the first light-emitting area LA1 and the second light-emitting area LA2 is increased.

Description

[Technical Field]

[0001] The present invention relates to a lighting system in which a projection display device and a lighting device cooperate to adjust the light intensity of the lighting device. [Background technology]

[0002] It is known that a projector can be connected wirelessly to devices including lighting equipment such as ceiling lights, and that the projector can control each device to suit a selected viewing mode (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-083453 Summary of the Invention [Problem to be solved by the invention]

[0004] The technology of Patent Document 1 controls the projector to optimize viewing, but does not mention control of lighting equipment that takes into account other areas in the same room. [Means for solving the problem]

[0005] In one aspect of the present invention, an illumination system is provided in a space equipped with a projection display device and an illumination device, the projection display device and the illumination device communicate with each other, the projection display device projects a projection image onto a projection surface in the space, the illumination device is fixed to one surface of the space and has multiple light-emitting areas that can be independently dimmed, and when the light-emitting area that is closest to the projection surface among the multiple light-emitting areas is designated as a first light-emitting area and the remaining areas are designated as second light-emitting areas, upon receiving either a start-up signal for the projection display device or an instruction signal to project onto the projection surface, the brightness of the first light-emitting area is made lower than the brightness of the second light-emitting area and the difference in brightness between the first and second light-emitting areas is increased. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 2 is a conceptual diagram illustrating an example of use of the lighting system according to the first embodiment. [Figure 2] FIG. 1 is a block diagram illustrating a lighting system. [Figure 3] FIG. 1 is a block diagram illustrating a projection display device. [Figure 4] FIG. 1 is a conceptual side view illustrating a lighting device. [Figure 5] FIG. 2 is a plan view illustrating a multiple light source unit of the lighting device. [Figure 6] 10A and 10B are plan views illustrating modified examples of the external shape of the lighting device. [Figure 7] A specific example of the dimming pattern of the lighting device will be described. [Figure 8] Another specific example of the dimming pattern of the lighting device will be described. [Figure 9] 10 is a flowchart illustrating an example of settings and operations of a lighting system. [Figure 10] FIG. 10 is a conceptual diagram illustrating a lighting system according to a second embodiment. [Figure 11] FIG. 11 is a conceptual diagram illustrating an example of dimming of the lighting system shown in FIG. [Figure 12] FIG. 10 is a plan view illustrating a lighting device in the lighting system of the third embodiment. [Figure 13] FIG. 10 is a plan view illustrating a lighting device in a lighting system according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0007] [First embodiment] A first embodiment of a lighting system according to the present invention will be described below with reference to the drawings.

[0008] Fig. 1 is a conceptual diagram illustrating an example of use of a lighting system 100 according to a first embodiment. Fig. 2 is a block diagram illustrating the lighting system.

[0009] The lighting system 100 includes a projection display device 10 and a lighting device 20. The projection display device 10 and the lighting device 20 are installed in a space SA. The space SA is, for example, a closed space such as a room RM, or a semi-closed space such as a booth. The room RM is, for example, a living room or a conference room. In the example of FIG. 1, the projection display device 10 is placed on a table TB placed on the floor of the room RM. The projection display device 10 projects or projects a projection image onto a projection surface 10s in the space SA. The lighting device 20 is fixed to one surface S1 of the space SA, specifically, to the ceiling surface RMa of the room RM.

[0010] In the lighting system 100, the projection display device 10 and the lighting device 20 cooperate with each other, and the lighting device 20 is dimmed according to the projection status of the projection display device 10. For example, wireless data communication is possible between the projection display device 10 and the lighting device 20. In other words, the projection display device 10 and the lighting device 20 cooperate by communicating with each other. The projection status of the projection display device 10 includes the on / off state of the power of the projection display device 10, the position of the projection display device 10, the projection direction PJ, etc. Here, the power-on state of the projection display device 10 includes the case where a start signal for the projection display device 10 or a command signal to project onto the projection surface 10s is output. Furthermore, the power-off state of the projection display device 10 includes the case where a stop signal for the projection display device 10 or a command signal to end projection is output.

[0011] In the lighting system 100, when the projection display device 10 projects an image toward the projection surface 10s, the lighting device 20 darkens the brightness of the projection surface side P1 compared to the brightness of the non-projection surface side P2. The non-projection surface side P2 is on the opposite side of the space SA from the projection surface 10s, but it does not have to be completely opposite and may include a direction intersecting the projection direction PJ. The degree of dimming of the lighting device 20 takes into consideration the relative positions of the projection display device 10 and the lighting device 20, the projection direction PJ, the projection range, the size of the space SA, etc.

[0012] The projection display device 10 is a projector that enlarges and projects any image onto a screen SC, which serves as a projection surface 10s. In the illustrated example, the screen SC or projection surface 10s is provided on a wall surface RMb of a room RM, which is a space SA. The projection display device 10 can be operated directly by the user or indirectly via a remote control (not shown) used by the user to select a video resource, for example.

[0013] FIG. 3 is a conceptual diagram illustrating the projection display device 10. As shown in FIGS. 2 and 3, the projection display device 10 has an optical system section 10a and a control system section 10b. The optical system section 10a and the control system section 10b are housed in a housing 10d, which is the device main body 10c. The projection display device 10 may also have an operating device such as a remote control for controlling the operation of the projection display device 10.

[0014] The optical system section 10a emits image light ML or video light. The optical system section 10a includes a projection light source section 11, a first dichroic mirror 12a, a second dichroic mirror 12b, reflection mirrors 12e, 12f, and 12g, relay lenses 12c and 12d, field lenses 2R, 2G, and 2B, liquid crystal panels 3R, 3G, and 3B, a cross dichroic prism 13, and a projection lens 14. The liquid crystal panels 3R, 3G, and 3B form an image forming section IM that forms a projection image on the reduction-side conjugate plane of the projection lens 14.

[0015] The projection light source unit 11 emits light that includes R light, G light, and B light in a homogenized state.

[0016] The first dichroic mirror 12a reflects the R light incident from the projection light source unit 11 and transmits the G and B light. The R light reflected by the first dichroic mirror 12a passes through a reflecting mirror 12e and a field lens 2R and enters a liquid crystal panel 3R, which is a light modulation element OM. The liquid crystal panel 3R forms an R image by modulating the R light in accordance with an image signal.

[0017] The second dichroic mirror 12b reflects the G light from the first dichroic mirror 12a and transmits the B light. The G light reflected by the second dichroic mirror 12b passes through a field lens 2G and enters a liquid crystal panel 3G, which serves as a light modulation element OM. The liquid crystal panel 3G forms a G image by modulating the G light in accordance with an image signal. The B light transmitted through the second dichroic mirror 12b passes through relay lenses 12c and 12d, reflecting mirrors 12f and 12g, and a field lens 2B and enters a liquid crystal panel 3B, which serves as a light modulation element OM. The liquid crystal panel 3B modulates the B light in accordance with an image signal to form a B image.

[0018] The cross dichroic prism 13 is a prism for light synthesis, and synthesizes the light modulated by each of the liquid crystal panels 3R, 3G, and 3B to form image light ML, which is then directed to the projection lens 14.

[0019] The projection lens 14 enlarges and projects the image light ML, which is modulated by the liquid crystal panels 3R, 3G, and 3B and combined by the cross dichroic prism 13, onto the screen SC shown in Fig. 1. The projection lens 14 may be a single-focus lens or a zoom lens.

[0020] The control system section 10b controls the operation of the optical system section 10a. The control system section 10b also acquires main body information of the projection display device 10. The main body information of the projection display device 10 includes the projection direction PJ, the tilt and attitude changes of the device main body 10c, etc. The main body information may also include information about the position of the projection display device 10. The control system section 10b includes a main control section 15a, an image processing section 15b, a display driving section 15c, a memory section 15d, an angular velocity sensor 15e, an acceleration sensor 15f, a geomagnetic sensor 15g, a position sensor 15h, an imaging section 15i, and a projection-side communication section 15j.

[0021] The main control unit 15a is a CPU and controls the overall operation of the image processing unit 15b, display drive unit 15c, memory unit 15d, angular velocity sensor 15e, acceleration sensor 15f, geomagnetic sensor 15g, position sensor 15h, imaging unit 15i, projection side communication unit 15j, etc.

[0022] The image processing unit 15b receives an external image signal such as a video signal and converts the input external image signal into an image signal including color gradations, etc. The image processing unit 15b can also perform various image processing such as distortion correction and color correction on the external image signal.

[0023] The display driver 15c drives the liquid crystal panels 3R, 3G, and 3B provided in the optical system part 10a based on the output of the image processor 15b, thereby causing the liquid crystal panels 3R, 3G, and 3B to form an image corresponding to the image signal or an image obtained by subjecting the image signal to image processing.

[0024] The storage unit 15d stores information necessary for the operation of the projection display device 10 (such as programs that execute the operation of the projection display device 10). The storage unit 15d also stores information about the main body of the projection display device 10.

[0025] The position and attitude of the projection display device 10 can be determined by using sensors such as the angular velocity sensor 15e, acceleration sensor 15f, geomagnetic sensor 15g, and position sensor 15h, and the imaging unit 15i, either singly or in combination.

[0026] The angular velocity sensor 15e is an inertial sensor that measures the rotational angular velocity and detects rotational movement. The angular velocity sensor 15e can detect changes in the attitude of the projection display device 10. As a result, it is possible to grasp the movement of the projection surface 10s based on the rotation of the device body 10c of the projection display device 10. This makes it possible to more reliably identify the lighting range of the lighting device 20. The angular velocity sensor 15e is, for example, a gyro sensor. The angular velocity sensor 15e measures rotational movement that the acceleration sensor 15f does not respond to.

[0027] The acceleration sensor 15f is an inertial sensor that measures acceleration and detects vibration, tilt, and linear motion. The acceleration sensor 15f makes it possible to determine the projection direction PJ of the projection display device 10 in relation to the direction of gravity. As a result, the location of the projection surface 10s can be identified.

[0028] The geomagnetic sensor 15g is a sensor that detects geomagnetism to detect direction. In particular, the geomagnetic sensor 15g can determine the horizontal projection direction PJ of the projection display device 10. As a result, even if the projection direction PJ of the projection display device 10 changes, the lighting range of the lighting device 20 can be more reliably identified. The geomagnetic sensor 15g is, for example, an electronic compass, a direction sensor, etc.

[0029] The position sensor 15h detects the position information of the projection display device 10. The position sensor 15h may be a sensor that utilizes magnetism, infrared rays, ultrasonic waves, or the like. For example, the position sensor 15h detects the position of the projection display device 10 within the space SA by receiving magnetic, infrared, ultrasonic, or other signals output from a transmitter installed within the space SA using a receiver in the position sensor 15h. Alternatively, the position sensor 15h may detect the relative positions of the projection display device 10 and the lighting device 20 by receiving signals from multiple transmitters provided in the lighting device 20. Alternatively, the position sensor 15h may receive signals from a GPS satellite.

[0030] The position sensor 15h may be omitted. The projection display device 10 may acquire position information by setting a reference position within the space SA and detecting the distance and direction of movement of the projection display device 10 from the reference position using the angular velocity sensor 15e, acceleration sensor 15f, geomagnetic sensor 15g, etc.

[0031] The projection display device 10 may also measure its orientation and position using a short-range wireless communication system such as Bluetooth (registered trademark). A communication unit acting as a master device for short-range wireless communication, specifically the projection-side communication unit 15j, can measure the relative positions of the projection display device 10 and the lighting device 20 by using multiple tags TG (see FIG. 1) arranged in the space SA. This allows the communication facilities between the projection display device 10 and the lighting device 20 to be used for position measurement. For example, multiple tags TG or beacons may be used to estimate the distance between the devices from radio wave intensity and measure their positions. Alternatively, multiple tags TG may be used to measure its orientation and position using AoA (Angle of Arrival) or AoD (Angle of Departure). It is preferable that one of the multiple tags TG is built into the lighting device 20.

[0032] The imaging unit 15i is, for example, a camera, and captures an image of the space SA including the lighting device 20 and the projection surface 10s. The captured image makes it possible to grasp the positions and directions of the lighting device 20 and the projection surface 10s. Note that the imaging unit 15i may be omitted.

[0033] The projection display device 10 preferably includes a distance measurement sensor 15k instead of or in addition to the imaging unit 15i. The distance measurement sensor 15k can measure the distance between the projection display device 10 and the projection surface 10s. For example, a ToF (Time of Flight) sensor that is installed in a typical projection display device 10 can be used as the distance measurement sensor 15k. This makes it possible to grasp the distance between the projection display device 10 and the projection surface 10s, and more reliably grasp the relative position between the projection surface 10s and the illumination device 20.

[0034] The projection-side communication unit 15j enables the projection display device 10 to communicate with the lighting device 20. The communication performed by the projection-side communication unit 15j may be wireless communication or wired communication. In the case of wireless communication, a short-range wireless communication system such as Bluetooth (registered trademark) or Wi-Fi (registered trademark) may be used. Note that the wireless communication may use infrared rays, visible light, or the like in addition to radio waves.

[0035] In this embodiment, the projection-side communication unit 15j is a Bluetooth Low Energy (BLE) communication device. For example, the projection display device 10 is the central, or parent device, and the lighting device 20 is the peripheral, or child device. However, the parent-child device relationship may be reversed. The central is responsible for controlling communication. The peripheral communicates in response to a request from the central. In the BLE system, the 2.4 GHz band is divided into multiple channels, and communication is performed by switching between the channels. In the BLE system, data communication is performed when the central issues a request to the peripheral. As described above, by using a BLE communication device for the projection-side communication unit 15j, it is possible to measure the direction, etc., simultaneously with communication.

[0036] Fig. 4 is a conceptual side view illustrating the lighting device 20. Fig. 5 is a plan view illustrating the multiple light source unit 21 of the lighting device 20. In the illustrated example, the lighting device 20 has an exterior shape that is dome-shaped or a shape like an ellipse cut in half when viewed from the side. Furthermore, the lighting device 20 has an exterior shape that is rectangular with rounded corners when viewed from the top.

[0037] The external shape of the lighting device 20 can be changed as appropriate. For example, as shown in area AR1 of Fig. 6, the external shape of the lighting device 20 may be circular in plan view. Alternatively, as shown in area AR2 of Fig. 6, the external shape of the lighting device 20 may be rectangular in plan view.

[0038] As shown in Figures 4 and 5, the lighting device 20 is, for example, a lighting fixture attached to a ceiling, specifically a ceiling light. As will be described in detail later, the lighting device 20 has multiple light-emitting areas LA that can be independently dimmed by a lighting circuit 23 shown in Figure 2. The lighting device 20 is capable of dimming each light-emitting area LA. The lighting of the lighting device 20 may be controlled in response to the operation of a remote control 40 shown in Figure 2, or may be controlled without using the remote control 40. The lighting device 20 acquires main body information of the projection display device 10 from the projection display device 10.

[0039] As shown in FIG. 4, the lighting device 20 has a main body 20a, a cover 20b, a control system 20c, a multiple light source unit 21, and an attachment unit 20d.

[0040] The main body 20a is the device main body 20x, and the exposed surface of the main body 20a is covered with a cover 20b. The cover 20b has, for example, a dome shape. The cover 20b is translucent but light-transmitting, and transmits and diffuses the illumination light IL emitted from the multiple light source unit 21. The main body 20a is fixed to an installation surface 50 by an attachment unit 20d. The installation surface 50 is a ceiling surface RMa, which is one surface S1 of the space SA (see FIG. 1), or the like. In addition to functioning as the support unit 27, the attachment unit 20d also functions as a power supply unit 28 that supplies current to the multiple light source unit 21. The attachment unit 20d can be attached to a hook unit 51, which also serves as a power supply connector, provided on the installation surface 50, to install the lighting device 20 on the installation surface 50.

[0041] As shown in FIG. 5, the multiple light source unit 21 has a flat substrate 21a and a plurality of light emitting elements 30. The plurality of light emitting elements 30 are arranged on the substrate 21a. A mark MA indicating the projection direction PJ of the projection display device 10 is displayed on the substrate 21a of the multiple light source unit 21. The mark MA may be, for example, an arrow. When the mark MA is an arrow, it is more preferable that the imaginary straight line VL connecting the direction of the arrow and the opposite direction intersects with the center of the entire partitioned area DA.

[0042] The light-emitting elements 30 are, for example, LEDs (light-emitting diodes) 31. In the illustrated example, the multiple light source unit 21 has multiple LEDs 31 arranged on approximately concentric circles. The LEDs 31 are, for example, composed of first LED elements 31a that emit light with a relatively high color temperature (for example, daylight light) and second LED elements 31b that emit light with a relatively low color temperature (for example, incandescent light). In the multiple light source unit 21, a circumference C1 on which the first LED elements 31a are arranged and a circumference C2 on which the second LED elements 31b are arranged are alternately arranged in the radial direction. The lighting of the first LED elements 31a and the second LED elements 31b can be independently controlled by a lighting circuit 23, which will be described later.

[0043] The multiple light source unit 21 has two or more segmented areas DA in the multiple light emitting areas LA. Preferably, the multiple light source unit 21 has three or more segmented areas DA. This makes it possible to display a projected image with high accuracy in the projection area PR1 (see FIG. 1) while suppressing the effects of brightness changes caused by the lighting device 20 in the non-projection area PR2 (see FIG. 1). In the illustrated example, the multiple light source unit 21 has four segmented areas DA1 to DA4.

[0044] In the multiple light source unit 21, the light emitting area LA that is closest to the projection surface 10s is designated as the first light emitting area LA1, and the remaining areas are designated as the second light emitting area LA2. The first light emitting area LA1 corresponds to the segmented area DA on the projection surface side P1 in the multiple light source unit 21. The second light emitting area LA2 corresponds to the segmented area DA on the non-projection surface side P2 in the multiple light source unit 21. The segmented areas DA that make up the first light emitting area LA1 and the second light emitting area LA2 change depending on the position of the projection display device 10 or the position of the projection surface 10s of the projection display device 10.

[0045] The more segmented areas DA there are, the more precisely the dimming range DR corresponding to the first light-emitting area LA1 can be set. The dimming range DR corresponding to the first light-emitting area LA1 is, for example, an angular range of 30° to 180°. If the multiple light source unit 21 is divided into, for example, 24 sectors, the dimming range DR can be set to, for example, 30°, 60°, 90°, 120°, 180°, etc. In the example of FIG. 5, the multiple light source unit 21 is divided into four segmented areas DA, and the dimming range DR is set in 90° increments.

[0046] 7 and 8, specific examples of dimming patterns of the lighting device 20 will be described. The dimming state of the lighting device 20 is set based on the relative position of the lighting device 20 and the projection surface 10s of the projection display device 10.

[0047] 7, when the projection surface 10s of the projection display device 10 is positioned closer to the first segmented area DA1 of the multiple light source unit 21, the first light-emitting area LA1 corresponds to the first segmented area DA1. The second light-emitting area LA2 corresponds to the remaining second to fourth segmented areas DA2 to DA4. The dimming range DR corresponding to the first light-emitting area LA1 is 90°. When the projection display device 10 projects, the lighting device 20 dims only the first segmented area DA1 of the first light-emitting area LA1 to set the brightness to 0% (off).

[0048] As shown in FIG. 8, when the projection surface 10s of the projection display device 10 is disposed in front of the first and second segmented areas DA1 and DA2 of the multiple light source unit 21, the first light-emitting area LA1 corresponds to the first and second segmented areas DA1 and DA2. The second light-emitting area LA2 corresponds to the remaining third and fourth segmented areas DA3 and DA4. The dimming range DR corresponding to the first light-emitting area LA1 is 180°. During projection by the projection display device 10, the lighting device 20 dims the first and second segmented areas DA1 and DA2 of the first light-emitting area LA1 to set the brightness to, for example, 0% to 50%. The first and second segmented areas DA1 and DA2 illustrated in FIG. 8 may be dimmed to the same level of brightness as when only the first segmented area DA1 illustrated in FIG. 7 is dimmed.

[0049] 2, the control system section 20c of the lighting device 20 includes a lighting control section 22, a lighting circuit 23, a memory section 24, a lighting-side communication section 25, and a remote control communication section 26. The control system section 20c is provided, for example, on a board (not shown) and disposed within the main body section 20a (see FIG. 4).

[0050] The lighting control unit 22 is a CPU that comprehensively controls the operation of the lighting circuit 23, memory unit 24, lighting communication unit 25, remote control communication unit 26, etc. The lighting control unit 22 controls the operation of the lighting circuit 23, etc. based on main body information of the projection display device 10 acquired or received via the lighting communication unit 25 and signals related to the operation of the projection display device 10. The lighting control unit 22 also controls the operation of the lighting circuit 23, etc. based on signals acquired or received via the remote control communication unit 26.

[0051] The lighting circuit 23 controls the light-emitting state of the multiple light source unit 21. The lighting circuit 23 can independently light each light-emitting element 30 or each LED 31 of the multiple light source unit 21. The LEDs 31 can be individually or grouped into multiple groups, allowing for partial lighting, thinned lighting, and the like. For example, the lighting circuit 23 can light only the first LED element 31a to provide daylight lighting, or light only the second LED element 31b to provide incandescent lighting. The lighting circuit 23 also changes the lighting state of the first light-emitting area LA1 and the second light-emitting area LA2 depending on the projection state of the projection display device 10.

[0052] The storage unit 24 stores information necessary for the operation of the lighting device 20 (such as a program that executes the operation of the lighting device 20). The storage unit 24 also stores information about the lighting state according to the projection state of the projection display device 10, information about the projection display device 10 itself acquired from the projection display device 10, and the like.

[0053] The lighting-side communication section 25 enables the lighting device 20 to communicate with the projection display device 10. The communication method of the lighting-side communication section 25 is the same as the communication method of the projection-side communication section 15j.

[0054] The remote control communication unit 26 receives an infrared signal emitted from a remote control 40 (see FIG. 2) outside the main body 20a, which allows lighting control of the lighting device 20, such as turning the light on and off, adjusting the brightness, and selecting the lighting color.

[0055] Below, we will explain basic lighting control of the multiple light source unit 21 when the projection display device 10 and the lighting device 20 work together. In the lighting system 100, the projection display device 10 is set with a projection direction PJ toward the projection surface 10s relative to the lighting device 20. Specifically, the projection direction PJ is parallel or approximately parallel to the direction of the mark MA provided on the multiple light source unit 21 of the lighting device 20.

[0056] In response to a power-on operation of the projection display device 10, the lighting system 100 adjusts the brightness of the light-emitting area LA (first light-emitting area LA1) closest to the projection surface 10s among the multiple light-emitting areas LA of the multiple light source unit 21. Specifically, when the first light-emitting area LA1 of the multiple light source unit 21 is located on the projection surface side P1, the lighting device 20 reduces the brightness of the first light-emitting area LA1 below the brightness of the second light-emitting area LA2 and increases the brightness difference between the first light-emitting area LA1 and the second light-emitting area LA2 upon receiving either a startup signal for the projection display device 10 or an instruction signal to be projected onto the projection surface 10s. As a result, when the projection display device 10 projects a projection image, the lighting device 20 reduces the brightness of the projection surface side P1 compared to the brightness of the non-projection surface side P2. Note that the instruction signal to be projected onto the projection surface 10s also includes a signal output when the device returns from a standby state for image display.

[0057] The lighting device 20 returns the brightness of the first light-emitting area LA1 and the second light-emitting area LA2 to their original brightness upon receiving either a stop signal from the projection display device 10 or an instruction signal to end projection. By returning the brightness of the first light-emitting area LA1 and the second light-emitting area LA2 to their original brightness in conjunction with a stop signal from the projection display device 10 or an instruction signal to end projection, the work of returning the brightness of the lighting device 20 to its original brightness can be reduced.

[0058] The lighting device 20 may reduce the luminance of the first light-emitting area LA1 and maintain the luminance of the second light-emitting area LA2 when receiving a start-up signal or the like from the projection display device 10. By changing only the luminance of the first light-emitting area LA1, the projection area PR1 including the projection surface 10s can be illuminated less and a projected image can be displayed well, and the non-projection area PR2 not including the projection surface 10s can be made less susceptible to the effects of luminance changes caused by the lighting device 20.

[0059] An example of the settings and operation of the lighting system 100 will be described below with reference to Fig. 9 etc. In this embodiment, the positional relationship between the projection display device 10 and the dimming range DR of the lighting device 20 is clear. In this case, the projection display device 10 and the lighting device 20 are physically aligned, but relative alignment is not necessary.

[0060] In this embodiment, the lighting system 100 fixes the position of the projection surface 10s of the projection display device 10 to a wall surface RMb. The lighting device 20 is fixed to one surface S1 of the space SA, specifically, the ceiling surface RMa, so that the mark MA faces the projection surface 10s. As a result, one side of the lighting device 20 on which the mark MA is provided is positioned approximately parallel to the projection surface 10s of the wall surface RMb. By first determining the projection direction PJ of the projection display device 10, it becomes easier to determine the dimming range DR corresponding to the first light-emitting area LA1 of the lighting device 20.

[0061] The lighting device 20 may store the predicted positions of the projection surface 10s in advance, and may select the corresponding position of the projection surface 10s from among the predicted positions.

[0062] 9, the projection display device 10 is placed at a predetermined position corresponding to the projection surface 10s, and communication is initiated between the projection display device 10 and the lighting device 20 (step S11). At this time, information about the projection display device 10 is transmitted to the lighting device 20. The information about the projection display device 10 is acquired by the various units 15e to 15i, such as sensors.

[0063] The lighting control unit 22 registers the initial relative position between the projection surface 10s of the projection display device 10 and the lighting device 20 (step S12). The lighting control unit 22 identifies the projection direction PJ of the projection display device 10 and the position of the projection surface 10s based on the main body information of the projection display device 10, etc. The projection display device 10 can calculate the position of the projection surface 10s from the position of the projection display device 10 and the projection distance. The position of the projection surface 10s may also be calculated by the lighting control unit 22 from the main body information of the projection display device 10. When the positions of the lighting device 20 and the projection surface 10s are fixed, as in this embodiment, the relative positions can be registered without communication.

[0064] Next, the lighting state of the lighting device 20 is set (step S13). The lighting control unit 22 sets the lighting state according to the projection state of the projection display device 10 by operating the remote control 40 or the like. Specifically, the lighting state is the amount of change in brightness of each light-emitting area LA according to the projection state, or the range of change in brightness. Step S13 may be omitted if it has been set in advance.

[0065] Steps S11 to S13 may be omitted if they are set at the beginning.

[0066] The projection display device 10 and the lighting device 20 are caused to start cooperation (step S14). Specifically, the projection display device 10 and the lighting device 20 are placed in a communication state, and a cooperation button on the remote control 40, for example, is pressed. The operation to start cooperation may be performed on the projection display device 10 side. Furthermore, cooperation may be started automatically when the lighting device 20 receives a start-up signal or the like from the projection display device 10 in step S15.

[0067] The main control unit 15a of the projection display device 10 outputs a start-up signal or a command signal to project onto the projection surface 10s (step S15). The main control unit 15a operates the display drive unit 15c to project the projection image. The main control unit 15a also transmits the start-up signal to the lighting device 20 via the projection-side communication unit 15j.

[0068] The lighting control unit 22 of the lighting device 20 receives a start-up signal and the like from the projection display device 10 via the lighting-side communication unit 25 (step S16).

[0069] The illumination control unit 22 operates the lighting circuit 23 according to the conditions set in step S13, and adjusts the brightness of each light-emitting area LA of the multiple light source unit 21 (step S17). Specifically, the illumination control unit 22 automatically reduces the brightness of the first light-emitting area LA1 closest to the projection surface 10s, and maintains the brightness of the second light-emitting area LA2 on the non-projection surface side P2.

[0070] If projection is to be ended (Y in step S21), the main control unit 15a of the projection display device 10 outputs a stop signal or an instruction signal to end projection (step S22). The main control unit 15a ends the operation of the display drive unit 15c. The main control unit 15a also transmits a stop signal or the like to the lighting device 20 via the projection-side communication unit 15j.

[0071] The lighting control unit 22 of the lighting device 20 receives a stop signal or the like from the projection display device 10 via the lighting-side communication unit 25 (step S23).

[0072] The illumination control unit 22 operates the lighting circuit 23 according to the conditions set in step S13, and adjusts the brightness of each light-emitting area LA of the multiple light source unit 21 (step S24). Specifically, the illumination control unit 22 automatically increases the brightness of the first light-emitting area LA1 closest to the projection surface 10s, and maintains the brightness of the second light-emitting area LA2 on the non-projection surface side P2.

[0073] The lighting system 100 described above is configured in a space SA equipped with a projection display device 10 and an illumination device 20, which communicate with each other. The projection display device 10 projects an image onto a projection surface 10s in the space SA. The illumination device 20 is fixed to one surface S1 of the space SA and has multiple light-emitting areas LA that can be independently dimmed. Of the multiple light-emitting areas LA, the light-emitting area LA that is closest to the projection surface 10s is designated as the first light-emitting area LA1, and the remaining areas are designated as second light-emitting areas LA2. Upon receiving either a start-up signal for the projection display device 10 or an instruction signal to project onto the projection surface 10s, the brightness of the first light-emitting area LA1 is made lower than the brightness of the second light-emitting area LA2, and the brightness difference between the first light-emitting area LA1 and the second light-emitting area LA2 is increased.

[0074] In the above-described lighting system 100, by lowering the brightness of the first light-emitting area LA1 and increasing the difference in brightness between the first light-emitting area LA1 and the second light-emitting area LA2, it is possible to suppress illumination and display a good projected image in the projection area PR1 of the space SA that has the projection surface 10s, and to reduce changes in brightness of the lighting device 20 in the non-projection area PR2 that does not include the projection surface 10s. Furthermore, by synchronizing the dimming of the lighting device 20 in response to a start-up signal or the like from the projection display device 10, it is possible to reduce the work of adjusting the brightness of the space SA.

[0075] Second Embodiment The lighting system of the second embodiment will be described below. Note that the lighting system of the second embodiment is a partial modification of the lighting system of the first embodiment, and a description of parts common to the lighting system of the first embodiment will be omitted.

[0076] In this embodiment, the lighting system 100 supports switching the position of the projection surface 10s of the projection display device 10 between a wall surface RMb and a ceiling surface RMa. The lighting device 20 receives position information and the like from the projection display device 10 at any time or when the projection direction PJ is switched. The lighting device 20 adjusts the brightness of the lighting device 20 based on the updated position information and the like. The ceiling surface RMa is more susceptible to the influence of the brightness of the lighting device 20 than the wall surface RMb. Therefore, the lighting device 20 adjusts the brightness so that the projection area PR1 is darker than when projected onto the wall surface RMb.

[0077] FIG. 10 is a conceptual diagram illustrating a lighting system 100 according to a second embodiment. As shown in FIG. 10, when the projection display device 10 projects toward a surface S1, specifically, a ceiling surface RMa, that is, when the projection direction PJ faces the ceiling surface RMa, the projection surface 10s is located in a projection area PR1 on the ceiling surface RMa, avoiding the illumination device 20. When the projection surface 10s is located on the ceiling surface RMa to which the illumination device 20 is fixed, there is a risk that light emitted from the illumination device 20 may also be visible when viewing the projection surface 10s. However, by lowering the brightness of the first light-emitting area LA1, the projection surface 10s can be clearly observed in the projection area PR1. Furthermore, the influence of brightness changes due to the illumination device 20 on the non-projection area PR2 can be reduced.

[0078] Fig. 11 is a conceptual diagram illustrating an example of dimming of the lighting system 100 of this embodiment. In Fig. 11, the brightness of the illumination light IL is indicated by the number of lines. In scenes Sn1 to Sn6, the lighting device 20 maintains the brightness of the second light-emitting area LA2 on the non-projection surface side.

[0079] In the example of FIG. 11, the projection display device 10 is positioned so that the projection direction PJ is directed toward a wall surface RMb, which is an intersecting plane S2 intersecting with a ceiling surface RMa, which is one surface S1, and the power of the projection display device 10 changes from an off state (scene Sn1) to an on state (scene Sn2). When the projection surface 10s is positioned on the wall surface RMb as in scene Sn2, the illumination device 20 reduces the brightness of the light-emitting area LA (specifically, the first light-emitting area LA1) that is closest to the projection surface 10s among the multiple light-emitting areas LA. Then, as shown in scene Sn3, the projection direction PJ switches from the wall surface RMb to the ceiling surface RMa. As shown in scene Sn3, when the projection surface 10s is switched from the wall surface RMb to the ceiling surface RMa, the illumination device 20 further reduces the brightness of the first light-emitting area LA1.

[0080] As shown in scene Sn4, the projection direction PJ switches from the ceiling surface RMa to the wall surface RMb. When the projection surface 10s switches from the ceiling surface RMa to the wall surface RMb as in scene Sn4, the illumination device 20 increases the brightness of the first light-emitting area LA1 compared to scene Sn3. Specifically, the illumination device 20 sets the brightness of the first light-emitting area LA1 to the same brightness as in scene Sn2. This allows the projection surface 10s to be clearly observed even when the surface displaying the projected image is switched. It also reduces the effect of brightness changes caused by the illumination device 20 on the non-projection area PR2. Then, in scene Sn5, the power to the projection display device 10 is turned off, and the illumination device 20 returns the brightness of the first light-emitting area LA1 to the original brightness of scene Sn1. After scene Sn3, the projection direction PJ for scene Sn4 is not changed, and the projection display device 10 is placed so that the projection direction PJ faces the ceiling surface RMa, and the power to the projection display device 10 is turned off (scene Sn6). In this case, too, the illumination device 20 returns the luminance of the first light-emitting area LA1 to the original luminance as in scene Sn1.

[0081] Third Embodiment The lighting system of the third embodiment will be described below. Note that the lighting system of the third embodiment is a partial modification of the lighting system of the first embodiment, and a description of parts common to the lighting system of the first embodiment will be omitted.

[0082] Area BR1 in FIG. 12 is a plan view illustrating the illumination device 20 of the illumination system 100 of the third embodiment. In this embodiment, the multiple light source unit 21 of the illumination device 20 is not provided with a mark MA serving as a reference for the projection direction PJ. The multiple light source unit 21 has four segmented areas DA1 to DA4. The first light-emitting area LA1 corresponds to one of the segmented areas DA1 to DA4 (in the illustrated example, the first segmented area DA1). The second light-emitting area LA2 corresponds to the remaining areas (in the illustrated example, the second to fourth segmented areas DA2 to DA4). By selecting the corresponding buttons 4a to 4d of the remote control 140 shown in area BR2 in FIG. 12, the illumination device 20 can adjust the brightness of each of the segmented areas DA1 to DA4 of the multiple light source unit 21 and set the illumination state according to the projection state of the projection display device 10.

[0083] In this embodiment, it is relatively easy to understand the positional relationship between the projection display device 10 and the dimming range DR of the lighting device 20. Therefore, although physical alignment between the projection surface 10s of the projection display device 10 and the lighting device 20 is necessary, relative alignment is not necessary.

[0084] The lighting device 20 can finely adjust the dimming of each of the divided areas DA1 to DA4 according to the position on the projection surface 10s of the projection display device 10. This makes it possible to accommodate projection onto wall surfaces RMb and ceiling surface RMa in four directions.

[0085] [Fourth embodiment] The lighting system of the fourth embodiment will be described below. Note that the lighting system of the fourth embodiment is a partial modification of the lighting system of the first embodiment, and a description of parts common to the lighting system of the first embodiment will be omitted.

[0086] 13 is a plan view illustrating an illumination device 20 in an illumination system 100 according to the fourth embodiment. In this embodiment, the multiple light source unit 21 of the illumination device 20 is not provided with a mark MA that serves as a reference for the projection direction PJ.

[0087] In this embodiment, the positional relationship between the projection display device 10 and the dimming range DR of the lighting device 20 is unclear. Therefore, relative positioning between the projection surface 10s of the projection display device 10 and the lighting device 20 is necessary.

[0088] As in FIG. 1, the lighting device 20 is placed at a predetermined position on the ceiling surface RMa and then fixed in place. The projection display device 10 can freely change the projection direction PJ by changing the orientation of the device body 10c. The projection surface 10s of the projection display device 10 and the lighting device 20 are aligned relative to each other based on position information of the projection display device 10 obtained from sensors 15e, 15f, 15g, and 15h of the projection display device 10 and the imaging unit 15i, etc., as shown in FIG. 2, etc. The lighting state of the lighting device 20 is set based on the projection direction PJ at the time of initial setup.

[0089] The projection display device 10 uses an angular velocity sensor 15e shown in Figure 2 etc. to detect changes in the attitude (projection angle, projection direction PJ) of the projection display device 10. The projection display device 10 also uses an acceleration sensor 15f to detect the direction of gravity, thereby being able to detect the direction of the ceiling surface RMa.

[0090] Furthermore, the projection display device 10 can grasp the projection direction PJ (north, south, east, and west) of the projection display device 10 in the horizontal direction by using the geomagnetic sensor 15g.

[0091] The projection display device 10 may also use the imaging unit 15i to determine the position of the lighting device 20. The imaging unit 15i can capture an image of the projection surface 10s of the projection display device 10. In particular, when projecting onto the ceiling surface RMa, the position of the lighting device 20 can be determined.

[0092] Although not shown, the projection display device 10 may use an illuminance sensor to determine the position of the lighting device 20. If the spectral distribution pattern of the illumination light IL from the lighting device 20 is recorded in the memory unit 15d in the projection display device 10, the accuracy of recognizing the illumination light IL from other light improves.

[0093] [Variations and Others] The present invention has been described above in accordance with the embodiments, but the present invention is not limited to the above embodiments and can be implemented in various forms without departing from the spirit of the invention, and for example, the following modifications are also possible.

[0094] The positions, directions, and inclinations of the projection display device 10 and the lighting device 20 can be changed as needed. For example, the projection display device 10 may be installed on a ceiling surface RMa, and the lighting device 20 may be installed on a wall surface RMb.

[0095] The size, shape, dimming setting, etc. of the light emitting area LA, the divided area DA, the dimming range DR, etc. of the lighting device 20 can be changed as appropriate.

[0096] The position of the projection surface 10s of the projection display device 10 can be switched as needed. For example, when projecting onto a wall surface RMb, the position of the projection surface 10s may be switched to a different location on the same wall surface RMb, or to a different intersecting wall surface RMb. Also, when projecting onto a ceiling surface RMa, for example, the position of the projection surface 10s may be switched to a different location.

[0097] The plurality of light emitting areas LA may include three or more light emitting areas LA in the multiple light source unit 21 of the lighting device 20. This allows the light of the lighting device 20 to be adjusted more accurately.

[0098] In the projection display device 10, the sensors 15e, 15f, 15g, and 15h and the imaging unit 15i can be omitted or replaced with alternative devices as appropriate.

[0099] The lighting system 100 may use a mobile terminal (not shown) or the like that can communicate with the projection display device 10 and the lighting device 20 to register relative positions, set dimming, etc. This allows for more complex settings.

[0100] Sensors such as angular velocity sensor 15e, acceleration sensor 15f, and geomagnetic sensor 15g may not necessarily be mounted within the projection display device 10, but may be mounted on other devices such as a mobile terminal. For example, by fixing a mobile terminal equipped with sensors 15e, 15f, and 15g to the projection display device 10 and enabling communication between the projection display device 10 and the mobile terminal, sensor information such as the position and attitude of the projection display device 10 and changes therein can be input to the projection display device 10 via the mobile terminal.

[0101] The optical elements that make up the projection display device 10 and the illumination device 20 are merely examples, and can be replaced with optical components that have equivalent functions.

[0102] Summary of this disclosure A summary of this disclosure is provided below.

[0103] (Supplementary Note 1) A lighting system in a space equipped with a projection display device and a lighting device, the projection display device and the lighting device communicating with each other, the projection display device projecting a projection image onto a projection surface in the space, the lighting device fixed to one surface of the space and having multiple light-emitting areas that can be independently dimmed, the light-emitting area that is closest to the projection surface being designated the first light-emitting area and the remaining areas being designated the second light-emitting areas, in which, upon receiving either a start-up signal for the projection display device or a command signal to project onto the projection surface, the brightness of the first light-emitting area is made lower than the brightness of the second light-emitting area and the difference in brightness between the first and second light-emitting areas is increased. In this way, by lowering the brightness of the first light-emitting area and increasing the brightness difference between the first and second light-emitting areas, it is possible to reduce lighting and display a good projected image in the projection area of ​​the space that has a projection surface, while reducing changes in the brightness of the lighting device in the non-projection area that does not include a projection surface. Furthermore, by synchronizing the dimming of the lighting device in response to a startup signal from the projection display device, the work of adjusting the brightness of the space can be reduced.

[0104] (Appendix 2) The lighting system of Appendix 1, wherein the lighting device returns the brightness of the first light-emitting area and the second light-emitting area to their original brightness upon receiving either a stop signal for the projection display device or an instruction signal to end projection. In this way, by restoring the brightness of the first light-emitting area and the second light-emitting area to their original brightness in conjunction with a stop signal for the projection display device or an instruction signal to end projection, the work of restoring the brightness of the lighting device to its original brightness can be reduced.

[0105] (Supplementary Note 3) The lighting system of any one of Supplementary Notes 1 and 2, wherein the lighting device reduces the brightness of the first light-emitting region and maintains the brightness of the second light-emitting region. In this way, by changing only the brightness of the first light-emitting area, the area including the projection surface can be illuminated less and the projected image can be displayed well, while the non-projection area not including the projection surface can be made less susceptible to brightness changes caused by the lighting device.

[0106] (Appendix 4) A lighting system according to any one of Appendices 1 to 3, in which the projection surface is located in a projection area of ​​one surface, avoiding the lighting device. In this way, when the projection surface is placed on the surface on which the lighting device is fixed, there is a risk that light emitted from the lighting device will also be visible when looking at the projection surface, but by lowering the brightness of the first light-emitting area, the projection surface can be clearly observed in the projection area, and the influence of brightness changes caused by the lighting device can be reduced in the non-projection area.

[0107] (Appendix 5) An illumination system according to any one of Appendices 1 to 4, wherein the illumination device further reduces the brightness of the first light-emitting region when the projection surface is switched from an intersecting plane that intersects with the first surface to the first surface, and increases the brightness of the first light-emitting region when the projection surface is switched from the first surface to the intersecting plane. This allows the projection surface to be clearly observed even when the surface displaying the projected image is switched, and also reduces the influence of brightness changes caused by the lighting device in the non-projection area.

[0108] (Appendix 6) The lighting system of any one of Appendices 1 to 5, wherein the lighting device has three or more partitioned regions in the plurality of light-emitting regions. This makes it possible to display a projected image with higher accuracy and quality in the projection area, while suppressing the influence of brightness changes caused by the lighting device in the non-projection area.

[0109] (Supplementary Note 7) The projection display device according to any one of Supplementary Notes 1 to 6, wherein the projection display device comprises an angular velocity sensor. This allows changes in the projection display device's posture to be detected, and as a result, the movement of the projection surface based on the rotation of the projection display device's main body can be grasped, making it possible to more reliably identify the lighting range of the lighting device.

[0110] (Supplementary Note 8) The lighting system of any one of Supplementary Notes 1 to 7, wherein the projection display device comprises an acceleration sensor. This makes it possible to grasp the projection direction of the projection display device in relation to the direction of gravity, and as a result, to identify the location of the projection surface.

[0111] (Supplementary Note 9) The illumination system of any one of Supplements 1 to 8, wherein the projection display device includes a geomagnetic sensor. This makes it possible to grasp the horizontal projection direction of the projection display device, and as a result, it is possible to more reliably identify the lighting range of the lighting device even if the projection direction of the projection display device changes.

[0112] (Supplementary Note 10) A lighting system according to any one of Supplements 1 to 9, wherein the projection display device and the lighting device communicate via short-range wireless communication, and the communication unit acting as the master device of the short-range wireless communication measures the relative positions of the projection display device and the lighting device by position measurement using multiple tags placed in space. This allows the communication facilities between the projection display device and the lighting device to be used for position measurement. [Explanation of symbols]

[0113] 10...Projection display device, 10a...Optical system part, 10b...Control system part, 10c...Device main body, 10d...Housing, 10s...Projection surface, 11...Projection light source part, 15a...Main control part, 15b...Image processing part, 15c...Display drive part, 15d...Memory part, 15e...Angular velocity sensor, 15f...Acceleration sensor, 15g...Geomagnetic sensor, 15h...Position sensor, 15i...Imaging part, 15j...Projection side communication part, 15k...Distance measurement sensor, 20...Illumination device, 20a...Main body part, 20b...Cover, 20c...Control system part, 20x...Device main body, 21...Multiple light source part, 22...Illumination control part, 2 3...lighting circuit, 24...storage unit, 25...lighting side communication unit, 26...remote control communication unit, 30...light emitting element, 31...LED, 40...remote control, 50...installation surface, 100...lighting system, 140...remote control, DA, DA1 to DA4...division area, DR...dimming range, IL...illumination light, IM...image formation unit, LA, LA1, LA2...light emitting area, MA...mark, ML...image light, P1...projection surface side, P2...non-projection surface side, PJ...projection direction, PR1...projection area, PR2...non-projection area, RMa...ceiling surface, RMb...wall surface, S1...one surface, S2...intersecting surface, SA...space, TG...tag

Claims

1. In a space equipped with a projection display device and a lighting device, the projection display device and the lighting device communicate with each other; the projection display device projects a projection image onto a projection surface in the space; The lighting device is fixed to one surface of the space and has a plurality of light-emitting regions that are independently dimmable. When the light-emitting region closest to the projection surface among the plurality of light-emitting regions is designated as a first light-emitting region and the remaining regions are designated as second light-emitting regions, upon receiving either a start-up signal for the projection display device or a command signal to project onto the projection surface, the lighting device lowers the luminance of the first light-emitting region below the luminance of the second light-emitting region and increases the difference in luminance between the first light-emitting region and the second light-emitting region. Lighting system.

2. the illumination device returns the brightness of the first light-emitting area and the second light-emitting area to their original brightness upon receiving either a stop signal of the projection display device or an instruction signal to end projection.

10. The lighting system of claim 1.

3. The lighting device reduces the luminance of the first light-emitting region and maintains the luminance of the second light-emitting region.

10. The lighting system of claim 1.

4. the projection surface is disposed in a projection area of ​​the one surface that avoids the illumination device; 10. The lighting system of claim 1.

5. the illumination device further reduces the luminance of the first light-emitting region when the projection surface is switched from an intersecting plane intersecting with the one surface to the one surface, and increases the luminance of the first light-emitting region when the projection surface is switched from the one surface to the intersecting plane.

10. The lighting system of claim 1.

6. The lighting device has three or more divided regions in the plurality of light-emitting regions.

10. The lighting system of claim 1.

7. The projection display device has an angular velocity sensor.

10. The lighting system of claim 1.

8. The projection display device has an acceleration sensor.

10. The lighting system of claim 1.

9. the projection display device has a geomagnetic sensor; 10. The lighting system of claim 1.

10. the projection display device and the lighting device communicate with each other via short-range wireless communication; a communication unit serving as a master device for the short-distance wireless communication measures the relative positions of the projection display device and the lighting device by position measurement using a plurality of tags arranged in the space; 10. The lighting system of claim 1.

Images