WO2023145333A1 - 照明装置 - Google Patents

照明装置 Download PDF

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Publication number
WO2023145333A1
WO2023145333A1 PCT/JP2022/047413 JP2022047413W WO2023145333A1 WO 2023145333 A1 WO2023145333 A1 WO 2023145333A1 JP 2022047413 W JP2022047413 W JP 2022047413W WO 2023145333 A1 WO2023145333 A1 WO 2023145333A1
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WO
WIPO (PCT)
Prior art keywords
light
distribution angle
light distribution
emission intensity
lighting device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/047413
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English (en)
French (fr)
Japanese (ja)
Inventor
和範 山口
宏幸 若菜
貴之 今井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Japan Display Inc
Original Assignee
Japan Display Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Japan Display Inc filed Critical Japan Display Inc
Priority to JP2023576708A priority Critical patent/JP7570541B2/ja
Priority to CN202280090157.0A priority patent/CN118575582A/zh
Publication of WO2023145333A1 publication Critical patent/WO2023145333A1/ja
Priority to US18/785,955 priority patent/US20240389209A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V33/00—Structural combinations of lighting devices with other articles, not otherwise provided for
    • F21V33/0004—Personal or domestic articles
    • F21V33/0052—Audio or video equipment, e.g. televisions, telephones, cameras or computers; Remote control devices therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/40—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/105—Controlling the light source in response to determined parameters
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/105—Controlling the light source in response to determined parameters
    • H05B47/11—Controlling the light source in response to determined parameters by determining the brightness or colour temperature of ambient light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/175—Controlling the light source by remote control
    • H05B47/19—Controlling the light source by remote control via wireless transmission
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/175—Controlling the light source by remote control
    • H05B47/196—Controlling the light source by remote control characterised by user interface arrangements
    • H05B47/1965—Controlling the light source by remote control characterised by user interface arrangements using handheld communication devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Definitions

  • the present invention relates to lighting devices.
  • a lighting fixture that change the light distribution angle by combining a light source such as an LED with a thin lens engraved with a prism pattern and changing the distance between the light source and the thin lens.
  • a lighting fixture is disclosed in which the front surface of a transparent light bulb is covered with a liquid crystal light control element and the transmittance of the liquid crystal layer is changed to switch between direct light and scattered light (see, for example, Patent Document 1).
  • the region irradiated with light can be adjusted by driving the liquid crystal cell and controlling the light distribution angle.
  • the amount of light per unit area within the irradiation range differs depending on whether the irradiation range of light is relatively wide or narrow. More specifically, when the irradiation area is relatively large, the amount of light per unit area within the irradiation range is lower than when the irradiation area is relatively small. In other words, when the irradiation area is relatively wide, the illuminance within the irradiation range is lower than when the irradiation area is relatively narrow. Therefore, in order to keep the relative brightness constant when the light distribution angle is changed, it is necessary to adjust the emission intensity of the light source according to the irradiation area.
  • An object of the present invention is to provide a lighting device that can keep the relative brightness substantially constant when the light distribution angle is changed.
  • a lighting device includes a light source, a light control device that controls a light distribution angle of light emitted from the light source, and a control unit that controls the light source and the light control device,
  • the control unit includes a storage unit that holds information indicating a correspondence relationship between an irradiation area calculated based on the light distribution angle command value and an irradiation area ratio with respect to a predetermined reference irradiation area;
  • a light emission intensity generation unit that generates an intensity
  • a drive unit that drives the light source based on the light emission intensity.
  • FIG. 1A is a side view showing an example of a lighting device according to an embodiment
  • FIG. FIG. 1B is a perspective view showing an example of the light control device according to the embodiment
  • FIG. 2 is a schematic plan view of the first substrate viewed from the Dz direction.
  • FIG. 3 is a schematic plan view of the second substrate viewed from the Dz direction.
  • FIG. 4 is a perspective view of a liquid crystal cell in which the first substrate and the second substrate are stacked in the Dz direction.
  • FIG. 5 is a cross-sectional view taken along line A-A' shown in FIG.
  • FIG. 6A is a diagram showing the rubbing direction of the alignment film of the first substrate.
  • FIG. 6B is a diagram showing the rubbing direction of the alignment film of the second substrate.
  • FIG. 6A is a diagram showing the rubbing direction of the alignment film of the first substrate.
  • FIG. 6B is a diagram showing the rubbing direction of the alignment film of the second substrate.
  • FIG. 7 is a conceptual diagram conceptually explaining the light distribution angle of the lighting device according to the embodiment.
  • FIG. 8 is a schematic diagram illustrating an example of a configuration of a lighting control system according to the embodiment;
  • FIG. 9 is an external view showing an example of the control device according to the embodiment;
  • FIG. 10 is a conceptual diagram showing an example of a touch detection area in a touch sensor.
  • 11 is a diagram illustrating an example of a control block configuration for adjusting the first data to be transmitted to the lighting device in the control device according to the embodiment;
  • FIG. 12 is a conceptual diagram showing an example of a first data adjustment method according to the embodiment.
  • 13A is a conceptual diagram showing a first display mode for adjusting first data in the control device according to the embodiment;
  • FIG. 13B is a conceptual diagram showing a second display mode for adjusting first data in the control device according to the embodiment
  • FIG. 14 is a flowchart illustrating an example of first data generation processing in the control device according to the embodiment
  • FIG. 15 is a diagram illustrating an example of a control block configuration of the lighting device according to the first embodiment
  • FIG. 16A is a first schematic diagram showing the relationship between the light irradiation range and the illuminance.
  • FIG. 16B is a second schematic diagram showing the relationship between the light irradiation range and the illuminance.
  • FIG. 17 is a first schematic diagram showing the relationship between the light irradiation area and the light distribution angle.
  • FIG. 18 is a schematic diagram showing the relationship between the light distribution angle and the area ratio to the irradiation area at the reference light distribution angle.
  • FIG. 19 is a diagram showing the relationship between the light distribution angle and the area ratio to the irradiation area at the reference light distribution angle.
  • FIG. 20 is a second schematic diagram showing the relationship between the light irradiation area and the light distribution angle.
  • FIG. 21 is a diagram showing the correspondence relationship between the light irradiation area and the emission intensity magnification.
  • 22 is a diagram showing a specific example of the emission intensity of the lighting device according to Embodiment 1.
  • FIG. 23A is a first schematic diagram showing the relationship between the light irradiation range and the illuminance of the lighting device 1 according to Embodiment 1.
  • FIG. 23A is a first schematic diagram showing the relationship between the light irradiation range and the illuminance of the lighting device 1 according to Embodiment 1.
  • FIG. 23B is a second schematic diagram showing the relationship between the light irradiation range and the illuminance of the lighting device 1 according to Embodiment 1.
  • FIG. 23C is a third schematic diagram showing the relationship between the light irradiation range and the illuminance of the lighting device 1 according to Embodiment 1.
  • FIG. 24 is a diagram illustrating an example of a control block configuration of a lighting device according to Embodiment 2.
  • FIG. 25 is a flowchart illustrating an example of light distribution angle control limiting processing in the lighting device according to the second embodiment;
  • FIG. 26 is a diagram illustrating an example of a control block configuration of a lighting device according to Embodiment 3.
  • FIG. 27A is a diagram showing a first example of emission intensity of the lighting device according to Embodiment 3.
  • FIG. 27B is a diagram showing a second example of light emission intensity of the lighting device according to Embodiment 3.
  • FIG. 1A is a side view showing an example of the lighting device according to the embodiment.
  • FIG. 1B is a perspective view showing an example of the light control device according to the embodiment;
  • the illumination device 1 includes a light source 4, a reflector 4a, and a dimming device 100.
  • the light control device 100 includes a first liquid crystal cell 2 and a second liquid crystal cell 3 .
  • the light source 4 is composed of, for example, a light emitting diode (LED: Light Emitting Diode).
  • the reflector 4 a is a component that collects the light from the light source 4 to the light control device 100 .
  • the Dz direction indicates the irradiation direction of light from the light source 4 and the reflector 4a.
  • the light control device 100 is configured by stacking a first liquid crystal cell 2 and a second liquid crystal cell 3 in the Dz direction.
  • one direction of the plane parallel to the lamination plane of the first liquid crystal cell 2 and the second liquid crystal cell 3 orthogonal to the Dz direction is the Dx direction
  • the direction orthogonal to both the Dx direction and the Dz direction is the Dy direction. It is said that
  • the first liquid crystal cell 2 and the second liquid crystal cell 3 have the same configuration.
  • the first liquid crystal cell 2 is a liquid crystal cell for p-wave polarized light.
  • the second liquid crystal cell 3 is a liquid crystal cell for s-wave polarization.
  • the first liquid crystal cell 2 may be a liquid crystal cell for s-wave polarization
  • the second liquid crystal cell 3 may be a liquid crystal cell for p-wave polarization. It is sufficient that one of the first liquid crystal cell 2 and the second liquid crystal cell 3 is a liquid crystal cell for p-wave polarization and the other is a liquid crystal cell for s-wave polarization.
  • FIG. 2 is a schematic plan view of the first substrate viewed from the Dz direction.
  • FIG. 3 is a schematic plan view of the second substrate viewed from the Dz direction.
  • FIG. 4 is a perspective view of a liquid crystal cell in which the first substrate and the second substrate are stacked in the Dz direction.
  • FIG. 5 is a cross-sectional view taken along line A-A' shown in FIG.
  • the first liquid crystal cell 2 and the second liquid crystal cell 3 are provided with a liquid crystal layer 8 between a first substrate 5 and a second substrate 6, the periphery of which is sealed with a sealing material 7. ing.
  • the liquid crystal layer 8 modulates light passing through the liquid crystal layer 8 according to the state of the electric field.
  • the liquid crystal layer 8 may employ a horizontal electric field mode such as FFS (fringe field switching), which is a form of IPS (in-plane switching), or may use a vertical electric field mode.
  • FFS frequency field switching
  • IPS in-plane switching
  • liquid crystals of various modes such as TN (Twisted Nematic), VA (Vertical Alignment), and ECB (Electrically Controlled Birefringence) may be used. is not limited by
  • the drive electrodes 10 on the first substrate 5 extend in the Dx direction.
  • the drive electrodes 13 on the second substrate 6 extend in the Dy direction.
  • the drive electrode 10 and the drive electrode 13 are translucent electrodes made of a translucent conductive material (translucent conductive oxide) such as ITO (Indium Tin Oxide).
  • the first substrate 5 and the second substrate 6 are translucent substrates such as glass or resin.
  • the first metal wiring 11 and the second metal wiring 14 are made of at least one metal material selected from aluminum (Al), copper (Cu), silver (Ag), molybdenum (Mo), and alloys thereof. Also, the first metal wiring 11 and the second metal wiring 14 may be a laminate obtained by laminating a plurality of metal materials using one or more of these metal materials. At least one metal material of aluminum (Al), copper (Cu), silver (Ag), molybdenum (Mo), or alloys thereof has a lower resistance than translucent conductive oxides such as ITO.
  • the metal wiring 11a of the first substrate 5 and the metal wiring 14a of the second substrate 6 are connected by a conducting portion 15a such as a via, for example. Also, the metal wiring 11d of the first substrate 5 and the metal wiring 14b of the second substrate 6 are connected by a conducting portion 15b such as a via, for example.
  • connection terminal portion 16a to be connected to a flexible printed circuit board (FPC: Flexible Printed Circuits) (not shown) is provided on the first substrate 5 and does not overlap with the second substrate 6 in the Dz direction. , 16b are provided.
  • the connection terminal portions 16a and 16b have four connection terminals corresponding to the metal wirings 11a, 11b, 11c and 11d, respectively.
  • connection terminal portions 16 a and 16 b are provided in the wiring layer of the first substrate 5 .
  • the first liquid crystal cell 2 and the second liquid crystal cell 3 are connected to the drive electrodes 10a and 10b on the first substrate 5 and the drive electrode 13a on the second substrate 6 from the FPC connected to the connection terminal portion 16a or the connection terminal portion 16b. , 13b is supplied.
  • connection terminal portions 16a and 16b may be simply referred to as "connection terminal portion 16".
  • the first substrate 5 and the second substrate 6 are overlapped in the Dz direction (light irradiation direction).
  • a plurality of drive electrodes 10 on the substrate 5 and a plurality of drive electrodes 13 on the second substrate 6 intersect.
  • driving voltages are supplied to the plurality of driving electrodes 10 on the first substrate 5 and the plurality of driving electrodes 13 on the second substrate 6, respectively.
  • the alignment direction of the liquid crystal molecules 17 of the liquid crystal layer 8 can be controlled.
  • a region in which the alignment direction of the liquid crystal molecules 17 of the liquid crystal layer 8 can be controlled is referred to as a "light control region AA".
  • the refractive index distribution of the liquid crystal layer 8 in this dimming area AA By changing the refractive index distribution of the liquid crystal layer 8 in this dimming area AA, it becomes possible to control light passing through the dimming area AA of the first liquid crystal cell 2 and the second liquid crystal cell 3 .
  • the area where the liquid crystal layer 8 is sealed with the sealing material 7 is called a "peripheral area GA" (see FIG. 5).
  • the drive electrodes 10 (the drive electrodes 10a in FIG. 5) are covered with the alignment film 18.
  • the driving electrodes 13 (the driving electrodes 13 a and 13 b in FIG. 5 ) are covered with the alignment film 19 in the light control region of the second substrate 6 .
  • the orientation film 18 and the orientation film 19 have different rubbing directions.
  • FIG. 6A is a diagram showing the rubbing direction of the alignment film of the first substrate.
  • FIG. 6B is a diagram showing the rubbing direction of the alignment film of the second substrate.
  • the rubbing direction of the alignment film 18 of the first substrate and the rubbing direction of the alignment film 19 of the second substrate are directions that cross each other in plan view.
  • the rubbing direction of the alignment film 18 of the first substrate 5 shown in FIG. 6A is orthogonal to the extending direction of the drive electrodes 10a and 10b.
  • the rubbing direction of the alignment film 19 of the second substrate 6 shown in FIG. 6B is perpendicular to the extending direction of the drive electrodes 13a and 13b.
  • a structure in which one first liquid crystal cell 2 and one second liquid crystal cell 3 are stacked is described, but the structure is not limited to this structure.
  • a configuration having a plurality of combinations in which the liquid crystal cells 3 are laminated may be used.
  • a configuration having two combinations in which the first liquid crystal cell 2 and the second liquid crystal cell 3 are stacked that is, a configuration having two liquid crystal cells for p-wave polarization and two liquid crystal cells for s-wave polarization. Also good.
  • the light distribution angle of the light emitted from the light source 4 is controlled by driving voltage control of the first liquid crystal cell 2 and the second liquid crystal cell 3 .
  • the light distribution angle of the lighting device 1 to be controlled in the present disclosure will be described below with reference to FIG. 7 .
  • FIG. 7 is a conceptual diagram conceptually explaining the light distribution angle of the lighting device according to the embodiment.
  • the illumination device 1 is assumed to be a point light source A, and the irradiation range of light on a virtual plane xy perpendicular to the Dz direction is shown.
  • FIG. 7 shows an example in which the illumination device 1 is regarded as a point light source A. Since it is configured to control transmitted light, the illuminance of the light decreases around the irradiation range. In addition, the outline of the irradiation range becomes unclear due to the diffraction phenomenon of light or the like.
  • the alignment direction of the liquid crystal molecules 17 of the liquid crystal layer 8 of the first liquid crystal cell 2 changes according to the drive voltage applied to the drive electrode 10 and the drive electrode 13 of the first liquid crystal cell 2,
  • the light distribution angle in the Dx direction changes.
  • the minimum light distribution angle in the Dx direction is 0[%] and the maximum light distribution angle in the Dx direction is 100[%].
  • the alignment direction of the liquid crystal molecules 17 of the liquid crystal layer 8 of the second liquid crystal cell 3 changes, and the Dy direction changes.
  • Light distribution angle changes.
  • the minimum light distribution angle in the Dy direction is 0[%]
  • the maximum light distribution angle in the Dy direction is 100[%].
  • a illustrates an irradiation range when both the light distribution angle in the Dx direction and the light distribution angle in the Dy direction are 100[%].
  • b shown in FIG. 7 illustrates an irradiation range when the light distribution angle in the Dx direction is 100[%] and the light distribution angle in the Dy direction is 30[%].
  • c shown in FIG. 7 illustrates an irradiation range when the light distribution angle in the Dx direction is 30[%] and the light distribution angle in the Dy direction is 100[%].
  • d shown in FIG. 7 illustrates an irradiation range when both the light distribution angle in the Dx direction and the light distribution angle in the Dy direction are 30[%].
  • the illumination device 1 having the configuration described above, by controlling the driving voltages of the first liquid crystal cell 2 and the second liquid crystal cell 3, the light distribution angles of the light in the Dx direction and the Dy direction can be controlled. can. Thereby, the irradiation range of the light of the lighting device 1 can be changed.
  • FIG. 8 is a schematic diagram showing an example of the configuration of the lighting control system according to the embodiment.
  • the lighting control system includes lighting device 1 and control device 200 .
  • the control device 200 is exemplified by a mobile communication terminal device such as a smart phone or a tablet, for example.
  • the communication means 300 is, for example, wireless communication means such as Bluetooth (registered trademark) or WiFi (registered trademark).
  • the lighting device 1 and the control device 200 may communicate wirelessly via a predetermined network such as a mobile communication network, for example.
  • the lighting device 1 and the control device 200 may be connected by wire to perform wired communication.
  • FIG. 9 is an external view showing an example of the control device according to the embodiment.
  • the control device 200 is a display device with a touch detection function in which the display panel 20 and the touch sensor 30 are integrated.
  • the display panel 20 is a so-called in-cell type or hybrid type device in which the touch sensor 30 is incorporated and integrated. Integrating the touch sensor 30 into the display panel 20 means, for example, that some members such as the substrate and electrodes used as the display panel 20 and some members such as the substrate and electrodes used as the touch sensor 30 It includes also serving as a member of
  • the display panel 20 may be a so-called on-cell type device in which the touch sensor 30 is mounted on the display device.
  • the display panel 20 for example, a liquid crystal display panel using a liquid crystal display element is exemplified.
  • the display panel 20 is not limited to this, and may be, for example, an organic EL display panel (OLED: Organic Light Emitting Diode) or an inorganic EL display panel (micro LED, mini LED).
  • OLED Organic Light Emitting Diode
  • micro LED mini LED
  • the touch sensor 30 is a capacitive touch sensor.
  • the touch sensor 30 is not limited to this, and may be, for example, a resistive touch sensor, an ultrasonic touch sensor, or an optical touch sensor.
  • FIG. 10 is a conceptual diagram showing an example of a touch detection area in a touch sensor.
  • a plurality of detection elements 31 are provided in the detection area FA of the touch sensor 30 .
  • the multiple detection elements 31 are arranged in a matrix in the X direction (first direction) and the Y direction (second direction) perpendicular to the X direction within the detection area FA of the touch sensor 30 .
  • the touch sensor 30 has a detection area FA overlapping the plurality of detection elements 31 arranged in the X direction (first direction) and the Y direction (second direction).
  • FIG. 11 is a diagram showing an example of a control block configuration for adjusting the first data to be transmitted to the lighting device in the control device according to the embodiment.
  • the control device 200 includes a detection device 210 and a processing device 220.
  • the detection device 210 includes a touch sensor 30 , a detection section 211 and a coordinate extraction section 212 .
  • the processing device 220 includes a first data generation section 221 and a storage section 223 .
  • the detection unit 211 and the coordinate extraction unit 212 of the detection device 210 are configured by detection ICs, for example.
  • the processing device 220 is, for example, a CPU (Central Processing Unit), RAM (Random Access Memory), EEPROM (Electrically Erasable Programmable Read Only Memory), ROM (Read Only Memory), etc. of a smartphone or tablet that constitutes the control device 200. Configured.
  • the detection unit 211 is a circuit that detects whether or not the touch sensor 30 is touched based on detection signals output from the detection elements 31 of the touch sensor 30 .
  • the coordinate extraction unit 212 is a logic circuit that obtains the coordinates of the touch detection position when the detection unit 211 detects a touch.
  • the first data generation unit 221 generates first data in the X direction and first data in the Y direction based on the touch detection position extracted by the coordinate extraction unit 212 .
  • the first data generation unit 221 is, for example, a configuration unit realized by a CPU of a smartphone, tablet, or the like that configures the control device 200 .
  • the storage unit 223 is composed of, for example, the RAM, EEPROM, ROM, etc. of a smartphone, tablet, etc. that constitute the control device 200 .
  • the storage unit 223 stores first data corresponding to the coordinates of the touch detection position extracted by the coordinate extraction unit 212, for example.
  • FIG. 12 is a conceptual diagram showing an example of a first data adjustment method according to the embodiment.
  • a data adjustment area TA is provided within the detection area FA of the touch sensor 30 .
  • the horizontal axis of the data adjustment area TA indicates the coordinate axis in the X direction (first direction) and corresponds to the Dx direction in the lighting device 1 .
  • the vertical axis of the data adjustment area TA indicates the coordinate axis in the Y direction (second direction) and corresponds to the Dy direction in the illumination device 1 .
  • the data adjustment area TA may be provided within the detection area FA of the touch sensor 30, and the data adjustment area TA may be the entire area of the detection area FA.
  • the first data in the X direction and the first data in the Y direction are respectively discrete values obtained by normalizing the information on the light distribution angle controlled by the lighting device 1 . That is, in the present embodiment, the first data generator 221 generates the first data R (Rx, Ry) using the information on the light distribution angle controlled by the lighting device 1 as a control parameter for the control device 200 .
  • the first data R (Rx, Ry) generated by the first data generator 221 in this embodiment is also referred to as "first light distribution angle information”.
  • the first data Rx in the X direction and the first data Ry in the Y direction each define values corresponding to the coordinates of the touch detection position detected in the data adjustment area TA.
  • the first data Rx in the X direction and the first data Ry in the Y direction can take values from "0" to "100".
  • the circle indicated by the dashed line in FIG. 12A indicates the trajectory of the coordinates of the position where the first data Rx in the X direction is "30" and the first data Ry in the Y direction is "30".
  • the locus of the coordinates of the position where the first data Rx of is "100” and the first data Ry in the Y direction is "100".
  • the trajectory of the coordinates of the position where the first data Ry of the direction is "50" is shown.
  • FIG. 12 shows an example in which the coordinates of the touch detection position are moved from position A to position B within the data adjustment area TA by the coordinate extraction unit 212 .
  • the first data generation unit 221 generates the coordinates of the touch detection position output from the coordinate extraction unit 212 in time series ( First data R (Rx, Ry) corresponding to x, y) is generated.
  • First data R (Rx, Ry) corresponding to x, y
  • k is a coefficient determined by the number of sensing elements 31 in the data adjustment area TA.
  • the first data changes by one step when the coordinates of the touch detection position move by four. That is, the amount of change in the first data R (Rx, Ry) is proportional to the amount of movement of the coordinates (x, y) of the touch detection position.
  • the control device 200 sequentially transmits the first data R (Rx, Ry) generated by the first data generating section 221 to the lighting device 1 .
  • FIG. 13A is a conceptual diagram showing a first display mode for adjusting first data in the control device according to the embodiment.
  • 13B is a conceptual diagram showing a second display mode for adjusting first data in the control device according to the embodiment;
  • the display panel 20 is provided with a display area DA that overlaps the detection area FA of the touch sensor 30 shown in FIG. 9 in plan view.
  • FIG. 13A shows a mode in which the trajectory of the coordinates of the position corresponding to the first data R (Rx, Ry) on the data adjustment area TA is displayed as the schematic shape image 23 of the irradiation range.
  • this first display mode for example, by tapping the position A on the outline shape image 23 of the irradiation range and swiping to the position B, the first data Rx in the X direction and the first data Ry in the Y direction are simultaneously adjusted. do.
  • FIG. 13B shows a mode in which a slide bar 24a for adjusting the first data Rx in the X direction and a slide bar 24b for adjusting the first data Ry in the Y direction are displayed on the data adjustment area TA.
  • the first data Rx is adjusted by tapping the slide bar 24a and swiping in the X direction
  • the first data Ry is adjusted by tapping the slide bar 24b and swiping in the Y direction.
  • the mode of adjusting the first data is not limited to the mode described above, and may be, for example, a mode in which a physical slider is provided in the control device 200.
  • FIG. 14 is a flowchart showing an example of first data generation processing in the control device according to the embodiment.
  • the detection unit 211 detects whether or not there is a touch within the data adjustment area TA of the touch sensor 30 (step S101).
  • the coordinate extraction unit 212 extracts the coordinates (x, y) of the touch detection position (step S102).
  • the first data generation unit 221 generates first data R (Rx, Ry) corresponding to the coordinates (x, y) of the touch detection position (step S103). Specifically, the first data generation unit 221 reads from the storage unit 223 the first data R (Rx, Ry) corresponding to the coordinates (x, y) of the touch detection position extracted by the coordinate extraction unit 212 .
  • the control device 200 transmits the first data R (Rx, Ry) generated by the first data generating section 221 to the lighting device 1 via the communication means 300 (step S104).
  • the detection unit 211 detects whether or not the touch within the data adjustment area TA of the touch sensor 30 continues (step S105).
  • step S101 If the touch is not detected in step S101 (step S101; No), or if the touch is not continued in step S105 (step S105; No), the process returns to step S101 to repeat the same process.
  • step S105 When the touch in the data adjustment area TA of the touch sensor 30 continues (step S105; Yes), the process returns to step S102, and the processes after step S102 are repeatedly executed.
  • the lighting device 1 changes the light distribution angle and light emission intensity in the Dx direction and the Dy direction according to the first data R (Rx, Ry) transmitted from the control device 200 .
  • the configuration and operation for controlling the light distribution angle and emission intensity of the lighting device according to the first embodiment will be described below.
  • (Embodiment 1) 15 is a diagram illustrating an example of a control block configuration of the lighting device according to the first embodiment
  • the control unit 110 of the lighting device 1 includes a second data generation unit 111, an electrode driving unit 112, an irradiation area calculation unit 113, a light source driving unit 117, a storage unit 118, and a light emitting unit.
  • An intensity generator 120 is included.
  • the luminous intensity generator 120 includes a luminous intensity magnification generator 114 , a luminous intensity calculator 115 , and a luminous intensity limiter 116 .
  • the second data generator 111 Based on the first light distribution angle information (first data R (Rx, Ry)) received from the control device 200, the second data generator 111 generates a light distribution angle Ax in the Dx direction and a light distribution in the Dy direction of the lighting device 1. Second data including information on the light angle Ay (light distribution angle A(Ax, Ay)) is generated.
  • the light distribution angle Ax in the Dx direction and the light distribution angle Ay in the Dy direction included in the second data generated by the second data generation unit 111 are each from 10 [deg] to 90 [deg]. can take a range.
  • the second data generator 111 generates second data including information on the light distribution angle Ax corresponding to the first light distribution angle information (first data R(Rx, Ry)) and the light distribution angle Ay in the Dy direction.
  • the second data is a discrete value obtained by normalizing the light distribution angle information (the light distribution angle Ax in the Dx direction and the light distribution angle Ay in the Dy direction) controlled by the illumination device 1 (dimmer 100).
  • the second data (the light distribution angle A (Ax, Ay)) generated by the second data generation unit 111 in this embodiment is also referred to as "second light distribution angle information”.
  • This second light distribution angle information (second data (light distribution angle A (Ax, Ay))) is a command value for the light distribution angle controlled by the illumination device 1 (dimmer 100).
  • the electrode driving unit 112 controls the first liquid crystal cell of the light control device 100. 2 and the drive electrodes 13 of the second liquid crystal cell 3 are supplied with a drive voltage.
  • second light distribution angle information (second data (light distribution angle A (Ax, Ay))) may be transmitted from the control device 200 .
  • the irradiation area calculation unit 113 calculates the irradiation area AR based on the second light distribution angle information (second data (light distribution angle A (Ax, Ay))).
  • the irradiation area obtained by the light emitted from the lighting device 1 is determined by the distance between the lighting device 1 and the object to be irradiated.
  • the “irradiation area” in the present disclosure is a relative value calculated using the light distribution angle A (Ax, Ay). A method for calculating the irradiation area AR will be described later.
  • the luminescence intensity magnification generation unit 114 generates a luminescence intensity magnification K with respect to the reference luminescence intensity at the reference light distribution angle based on the irradiation area AR calculated by the irradiation area calculation unit 113 .
  • the reference light distribution angle in the present disclosure is the minimum value (for example, 10 [deg]) in the range (for example, 10 [deg] to 90 [deg]) that the light distribution angle A (Ax, Ay) can take, that is, the illumination This is the minimum value of the light distribution angle control range in device 1 (dimmer 200).
  • the reference light distribution angle is not limited to the above, and can be any light distribution angle within the light distribution angle control range of the illumination device 1 (dimmer 200).
  • the reference emission intensity in the illumination device 1 is, for example, 5 [lm (lumen)].
  • the emission intensity in the present disclosure is a value normalized with reference to a preset reference emission intensity (for example, 5 [lm]) at the reference light distribution angle. Note that when the reference light distribution angle is an arbitrary light distribution angle within the light distribution angle control range of the lighting device 1 (light control device 200), the reference light emission intensity of the lighting device 1 (light source 4) is also set to the reference light distribution angle can be changed to a value according to
  • the luminescence intensity calculation unit 115 calculates a second luminescence intensity LS2 by multiplying the first luminescence intensity LS1 by the luminescence intensity magnification K generated by the luminescence intensity magnification generation unit 114 .
  • the first emission intensity LS1 is, for example, a reference emission intensity.
  • the first light emission intensity LS1 is not limited to the reference light emission intensity, and may be, for example, a command value for light emission intensity transmitted from the control device 200 .
  • the emission intensity limiting unit 116 outputs the emission intensity LS obtained by limiting the upper limit of the second emission intensity LS2 calculated by the emission intensity calculation unit 115 to the emission intensity limit value.
  • the light source drive unit 117 supplies drive current to the light source 4 based on the light emission intensity LS output from the light emission intensity limiter 116 .
  • the storage unit 118 stores a lookup table (see FIG. 21) showing the correspondence relationship between the irradiation area AR and the emission intensity magnification K.
  • the emission intensity magnification generation unit 114 refers to the lookup table stored in the storage unit 118 , reads out the emission intensity magnification K corresponding to the irradiation area AR calculated by the irradiation area calculation unit 113 , and outputs it to the emission intensity calculation unit 115 . Output.
  • the storage unit 118 stores the emission intensity limit value LS_lim.
  • Luminous intensity limiting section 116 limits the upper limit of second luminous intensity LS2 calculated by luminous intensity calculating section 115 to luminous intensity limit value LS_lim stored in storage section 118 .
  • FIG. 16A is a first schematic diagram showing the relationship between the light irradiation range and the illuminance.
  • FIG. 16B is a second schematic diagram showing the relationship between the light irradiation range and the illuminance. 16A and 16B show an example in which the emission intensity of the light source of the illumination device 1 is constant regardless of the irradiation area.
  • the amount of light per unit area within the irradiation range differs depending on whether the irradiation range is relatively wide or narrow. More specifically, as shown in FIG. 16B, when the irradiation area is relatively wider than the example shown in FIG. 16A, the amount of light per unit area within the irradiation range decreases. In other words, as shown in FIG. 16B, when the irradiation area is relatively wider than the example shown in FIG. 16A, the illuminance within the irradiation range is reduced. Therefore, in order to keep the relative brightness constant when the light distribution angle is changed, it is necessary to adjust the emission intensity of the light source according to the light irradiation area.
  • FIG. 17 is a first schematic diagram showing the relationship between the light irradiation area and the light distribution angle.
  • the irradiation area AR is expressed by the following formula (3), where r is the radius of the irradiation range.
  • the light distribution angle Ax in the X direction and the light distribution angle Ay in the Y direction are proportional to the radius r of the irradiation range. Therefore, the irradiation area AR can be expressed by the following formula (4).
  • FIG. 18 is a schematic diagram showing the relationship between the light distribution angle and the area ratio to the irradiation area at the reference light distribution angle.
  • FIG. 19 is a diagram showing the relationship between the light distribution angle and the area ratio to the irradiation area at the reference light distribution angle.
  • FIG. 18 shows a cross-sectional view along a perpendicular line h extending from the lighting device 1 to the XY plane, assuming that the lighting device 1 is a point light source.
  • the solid line shown in FIG. 19 indicates the irradiation area ratio at an arbitrary light distribution angle when the irradiation area (AR_nor) at the reference light distribution angle (here, 10 [deg]) on the XY plane is used as a reference.
  • a dashed line shown in FIG. 18 indicates a spherical surface centered on the illumination device 1 .
  • the reference light distribution angle here, 10 [deg]
  • the irradiation area ratio at an arbitrary light distribution angle when the irradiation area is used as a reference is the square of the light distribution angle A (A 2 ), as shown by the dashed line in FIG. It can be represented by a curve.
  • the irradiation area AR on the XY plane increases with increasing distance from the intersection of the perpendicular h and the XY plane, as shown in FIG. Therefore, the irradiation area ratio (AR/AR_nor) at an arbitrary light distribution angle when the irradiation area (AR_nor) on the XY plane at the reference light distribution angle (here, 10 [deg]) is used as a reference is shown in FIG. , the larger the light distribution angle, the larger the value for the quadratic curve indicated by the dashed line.
  • the irradiation area at the reference light distribution angle (here, 10 [deg]) on the spherical surface centered on the lighting device 1 is used as a reference, the spherical surface centered on the lighting device 1
  • the irradiation area (AR_nor) at the reference light distribution angle (here, 10 [deg]) on the XY plane is used as a reference
  • the irradiation area ratio AR at an arbitrary light distribution angle on the XY plane is the light distribution angle
  • the emission intensity magnification K is the irradiation area ratio (AR/AR_nor) when the irradiation area (AR_nor) on the XY plane at the reference light distribution angle (here, 10 [deg]) is used as a reference.
  • the irradiation area ratio (AR/AR_nor) to this reference irradiation area (AR_nor) is Let K be the luminous intensity magnification. Specifically, for example, when the irradiation area ratio AR/AR_nor is 2, the emission intensity magnification K is set to "2". This makes it possible to keep the relative brightness substantially constant when the light distribution angle is changed.
  • FIG. 20 is a second schematic diagram showing the relationship between the light irradiation area and the light distribution angle.
  • FIG. 20 illustrates a case where the light distribution angle Ax in the X direction and the light distribution angle Ay in the Y direction are different (Ax>Ay in FIG. 20), that is, the case where the irradiation range has an elliptical shape. .
  • the irradiation area AR is expressed by the following formula (5), where a is the major axis radius of the irradiation range and b is the minor axis radius.
  • the light distribution angle Ax in the X direction is proportional to the major axis radius a
  • the light distribution angle Ay in the Y direction is proportional to the minor axis radius b. Therefore, the irradiation area AR can be expressed by the following formula (6).
  • FIG. 21 is a diagram showing the correspondence relationship between the light irradiation area and the emission intensity magnification.
  • the dashed line is centered on the illumination device 1 when the irradiation area on the XY plane at the reference light distribution angle (here, 10 [deg]) on the spherical surface centered on the illumination device 1 is used as the reference. It shows the irradiation area ratio (light emission intensity magnification) at an arbitrary light distribution angle on the spherical surface.
  • the correspondence relationship between the irradiation area and the irradiation area ratio (light emission intensity magnification) is linear.
  • the irradiation area ratio AR/AR_nor increases as the light distribution angle increases with respect to the irradiation area ratio on the spherical surface centered on the illumination device 1 indicated by the dashed line.
  • the lookup table shown in FIG. uses this lookup table to generate the luminous intensity magnification K.
  • the emission intensity calculator 115 calculates a second emission intensity LS2 by multiplying the first emission intensity LS1 by the emission intensity magnification K. Thereby, the relative brightness can be kept substantially constant when the light distribution angle is changed.
  • the information indicating the correspondence relationship between the irradiation area AR and the emission intensity magnification K is not limited to the form of a lookup table as shown in FIG.
  • the defined function may be stored in the storage unit 118, or the emission intensity magnification K corresponding to the irradiation area AR may be stored as data.
  • FIG. 22 is a diagram showing a specific example of the emission intensity of the lighting device according to Embodiment 1.
  • the second luminous intensity LS2 calculated by the luminous intensity calculator 115 may vary depending on the magnitude of the first luminous intensity LS1 transmitted from the control device 200, for example, depending on the driving current in the light source 4 in a region where the irradiation area AR is relatively large. may exceed the upper limit of
  • the light emission intensity limit value LS_lim that does not exceed the upper limit value of the drive current in the light source 4 is stored in the storage unit 118, and the light emission intensity limiter 116 sets the upper limit value of the second light emission intensity LS2. is limited to the emission intensity limit value LS_lim shown in FIG. Thereby, the relative brightness can be kept substantially constant when the light distribution angle is changed.
  • FIG. 23A is a first schematic diagram showing the relationship between the light irradiation range and the illuminance of the lighting device 1 according to Embodiment 1.
  • FIG. 23B is a second schematic diagram showing the relationship between the light irradiation range and the illuminance of the lighting device 1 according to Embodiment 1.
  • FIG. 23C is a third schematic diagram showing the relationship between the light irradiation range and the illuminance of the lighting device 1 according to Embodiment 1.
  • FIG. 23A is a first schematic diagram showing the relationship between the light irradiation range and the illuminance of the lighting device 1 according to Embodiment 1.
  • FIG. 23B is a second schematic diagram showing the relationship between the light irradiation range and the illuminance of the lighting device 1 according to Embodiment 1.
  • FIG. 23C is a third schematic diagram showing the relationship between the light irradiation range and the illuminance of the lighting device 1 according to Embodiment 1.
  • the relative brightness is kept substantially constant when the light distribution angle is changed, as shown in FIGS. 23A and 23B.
  • the drive current in the light source 4 is suppressed so as not to exceed the upper limit value. Become.
  • the illumination device 1 holds information indicating the correspondence relationship between the irradiation area AR and the luminous intensity magnification K in the storage unit 118, and calculates the luminous intensity based on the information. Then, the driving current is supplied to the light source 4 by limiting the emission intensity so as not to exceed the upper limit of the driving current of the light source 4 .
  • the relative brightness can be kept substantially constant when the light distribution angle is changed, and the highly convenient lighting device 1 can be obtained.
  • FIG. A control unit 110a of the lighting device 1a according to the second embodiment includes a light distribution angle control limit processing unit 119 in addition to the configuration of the first embodiment.
  • the emission intensity limiting unit 116a of the emission intensity generating unit 120a issues a light distribution angle adjustment enable/disable command indicating whether the second emission intensity LS2 calculated by the emission intensity calculation unit 115 is less than the emission intensity limit value LS_lim. is output to the light distribution angle control limit processing unit 119 .
  • the light distribution angle control limit processing unit 119 calculates the light distribution angle A (Ax, Ay) in the previous process of the light distribution angle control limit process described below (hereinafter also referred to as the "previous value of the light distribution angle A (Ax, Ay)"). ) is retained.
  • the previous value of the light distribution angle A (Ax, Ay) may be stored in the storage unit 118 .
  • the light distribution angle control limit processing unit 119 controls the light distribution angle A (Ax , Ay) is output to the electrode driver 112 . Thereby, the adjustment control of the light distribution angle in the light control device 100 is restricted.
  • 25 is a flowchart illustrating an example of light distribution angle control limiting processing in the lighting device according to the second embodiment; FIG.
  • the light distribution angle control limit processing unit 119 determines whether or not the second light emission intensity LS2 is less than the light emission intensity limit value LS_lim (LS ⁇ LS_lim) based on the light distribution angle adjustment enable/disable command (step S201).
  • step S201 If the second emission intensity LS2 is less than the emission intensity limit value LS_lim (step S201; Yes), the light distribution angle control limit processing unit 119 converts the light distribution angle A(Ax, Ay ) to the electrode driving unit 112 (step S202), and the process returns to step S201.
  • step S201 If the second emission intensity LS2 is equal to or greater than the emission intensity limit value LS_lim (step S201; No), the light distribution angle control limit processing unit 119 sends the previous value of the light distribution angle A (Ax, Ay) to the electrode driving unit 112. Output (step S203) and return to the process of step S201.
  • the light distribution angle control limit processing unit 119 determines that the second light emission intensity LS2 is less than the light emission intensity limit value LS_lim while the second light emission intensity LS2 is equal to or greater than the light emission intensity limit value LS_lim. Output the held light distribution angle A (Ax, Ay). Accordingly, when the second light emission intensity LS2 is equal to or greater than the light emission intensity limit value LS_lim, the light distribution angle adjustment control by the light control device 100 is not performed.
  • the second light emission intensity LS2 when the second light emission intensity LS2 is equal to or greater than the light emission intensity limit value LS_lim, the previous value of the light distribution angle A (Ax, Ay) is set to the electrode driving unit 112. output.
  • the relative brightness can be kept substantially constant when the light distribution angle is changed in a region where the adjustment control of the light distribution angle by the light modulation device 100 is not restricted.
  • FIG. 3 is a diagram illustrating an example of a control block configuration of a lighting device according to Embodiment 3.
  • FIG. A lighting device 1b according to the second embodiment includes an ambient light sensor 130 in addition to the configuration of the second embodiment.
  • the ambient light sensor 130 is exemplified by an illuminance sensor, for example.
  • the ambient light sensor 130 detects ambient light AL around the lighting device 1b.
  • the ambient light AL detected by the ambient light sensor 130 is input to the emission intensity generator 120b of the controller 110b.
  • the luminous intensity calculator 115a of the luminous intensity generator 120b calculates a second luminous intensity LS2 by adding a luminous intensity LS_base corresponding to the ambient light AL to a value obtained by multiplying the first luminous intensity LS1 by the luminous intensity magnification K.
  • the illuminance within the irradiation range can be adjusted according to the environmental light around the lighting device 1b.
  • FIG. 27A is a diagram showing a first example of emission intensity of the lighting device according to Embodiment 3.
  • FIG. 27B is a diagram showing a second example of light emission intensity of the lighting device according to Embodiment 3.
  • FIG. 27A is a diagram showing a first example of emission intensity of the lighting device according to Embodiment 3.
  • FIG. 27B is a diagram showing a second example of light emission intensity of the lighting device according to Embodiment 3.
  • FIG. 27A is a diagram showing a first example of emission intensity of the lighting device according to Embodiment 3.
  • FIG. 27B is a diagram showing a second example of light emission intensity of the lighting device according to Embodiment 3.
  • the range in which the second emission intensity LS2 is equal to or greater than the emission intensity limit value LS_lim changes depending on the ambient light around the lighting device 1b.
  • the range in which the light emission intensity LS2 is equal to or greater than the light emission intensity limit value LS_lim is widened, the adjustment control of the light distribution angle by the light control device 100 is limited by providing the light distribution angle control limit processing unit 119 described in the second embodiment. In the area where the light is not illuminated, the relative brightness can be kept substantially constant when the light distribution angle is changed.

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