Optically collapsible unit lce with led, such as muled

Abstract

The invention provides a light generating system (1000) comprising a plurality of first light generating devices (110), a flexible substrate (30), a first photoresponsive material (1040), a second light generating device (120) and a control system (300); wherein the first photoresponsive material (1040) comprises a first liquid crystal elastomer (1041); wherein the first photoresponsive material (1040) is responsive to radiation having a second wavelength (k2) such that the first photoresponsive material (1040) at least temporarily expands or contracts under radiation having a second wavelength ([lambda] 2).

Description

Technical Field

[0001] The invention relates to a lighting device comprising a light generating system. Background Art

[0002] Film-forming photosensitive materials are known in the art. For example, WO2006117403A1 describes a self-supporting or substrate-supported photosensitive material film or layer comprising a water-insoluble complex having photosensitive building blocks, wherein the photosensitive components can undergo a photoreaction selected from photoisomerization, photocycloaddition, and photoinduced rearrangement.

[0003] US2019 / 213978Α1 discloses a flexible display device, which includes a base substrate, a display component located on the base substrate, a top cover plate configured to encapsulate the display component, a deformation layer configured to generate deformation to drive the flexible display device to deform, and a control element located on the base substrate and configured to control the deformation variable of the deformation layer.

[0004] US11170679B discloses a time-division display control method, which includes displaying a first image through a display device, and changing the display pixel distribution of the display device at least once within a preset human eye visual allowable dwell time, and displaying the first image through the display device that is changed each time, so that the displayed first image is displayed as a second image in an overlapping manner in the human eye. The utilization rate of the display pixels of the display device and the display quality of at least part of the image can be improved, thereby better meeting the diverse practical application needs of users. Summary of the invention

[0005] Light generating devices, especially those based on LEDs, are of interest for various applications including spotlights, stage lighting, headlights, home and office lighting, and (fluorescence) microscopy and endoscopy. However, the optics used in current LED-based products are static items, as they are fixed in space. For applications in, for example, microrobotics and biotechnology, e.g. for use as artificial muscles, it would be desirable to use dynamic LED-based products.

[0006] Therefore, one aspect of the present invention is to provide an alternative lighting device, which preferably further at least partially obviates one or more of the above disadvantages.An object of the present invention is to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative.

[0007] The present invention proposes the use of stimuli-responsive materials. Stimuli-responsive materials are materials that can change their shape, size or appearance under the influence of stimuli such as temperature, light or pH. These properties can be adjusted according to the needs of the user or environmental changes. The use of pH as a stimulus can bring the disadvantage that the direct chemical environment of the stimuli-responsive polymer film must be changed. Temperature-responsive polymer films may require the integration of complex electrodes or heating elements, which may increase the complexity and cost of assembly. However, it seems that stimuli-responsive materials for light stimulation can be an interesting option. An attractive stimulus for these polymers is light, because it can be applied locally in a non-contact manner. In particular, the application of liquid crystal elastomers seems to be useful. Liquid crystal elastomers (LCE) seem to be able to perform reversible shape changes in response to external light stimuli. LCEs are considered "smart" materials because they can be designed to respond only to predetermined stimuli and not to other stimuli. The properties of this material provide ideas for possible applications in lighting. By using LCE materials, it is possible to manufacture dynamic items of optical devices. Therefore, the present invention proposes the use of light-responsive materials to provide dynamic properties of light-generating systems.

[0008] According to a first aspect, the present invention provides a lighting device, the lighting device comprising a light generating system ("system"), the light generating system comprising a plurality of first light generating devices, a flexible substrate (or "substrate"), a first light responsive material, a second light generating device and a control system. In particular, in an embodiment, the plurality of first light generating devices may include one or more solid-state light sources. More particularly, in an embodiment, the plurality of first light generating devices may be configured to generate a first device light. Furthermore, in an embodiment, the flexible substrate may be configured to support the plurality of first light generating devices. In an embodiment, the first light responsive material may include a first liquid crystal elastomer. Furthermore, in an embodiment, the first light responsive material may be responsive to radiation having a second wavelength λ2, such that the first light responsive material may at least temporarily expand or contract under the radiation having the second wavelength λ2. Furthermore, in an embodiment, the first light responsive material may be arranged in contact with the flexible substrate, such that the expansion or contraction of the first light responsive material may cause a conformational change of the flexible substrate. In an embodiment, the second light generating device may be configured to generate a second device light having a second spectral power distribution including an intensity at the second wavelength λ2. In particular, in an embodiment, the first light responsive material may be configured to be in a light receiving relationship with the second light generating device. Furthermore, in an embodiment, the light generating system may be configured to generate system light. Furthermore, in an embodiment, the system light may include at least a portion of the first device light. In an embodiment, the control system may be configured to control one or more of the beam shape and beam direction of the beam of the system light by controlling the second light generating device. Furthermore, in an embodiment, the first device light may not provide stimulation to the first light responsive material. Additionally or alternatively, one or more solid-state light sources may include a cross-sectional area ≤ 1 mm 2LED tube core. In a specific embodiment, the present invention provides a light generating system, including a plurality of light generating devices, a flexible substrate, a first light responsive material, a second light generating device, and a control system; wherein: one or more first light generating devices may include one or more solid-state light sources; wherein the plurality of first light generating devices may be configured to generate first device light; wherein the flexible substrate may be configured to support the plurality of first light generating devices; wherein the first light responsive material may include a first liquid crystal elastomer; wherein the first light responsive material may respond to radiation having a second wavelength λ2, such that the first light responsive material may at least temporarily expand or contract under the radiation having the second wavelength λ2; wherein the first light responsive material may be arranged in contact with the flexible substrate, such that the expansion or contraction of the first light responsive material may cause a conformational change of the flexible substrate; wherein the second light generating device may be configured to generate a second device light having a second spectral power distribution including an intensity at the second wavelength λ2; wherein the first light responsive material may be configured to be in a light receiving relationship with the second light generating device; and wherein the light generating system may be configured to generate a system light including at least a portion of the first device light; wherein the control system may be configured to control one or more of a beam shape and a beam direction of a beam of the system light by controlling the second light generating device.

[0009] With the present lighting device, a dynamic lighting device comprising a light generating system can be prepared, i.e., a light generating system that can expand, contract, bend, or fold. The present system can enable user-friendly light responsive materials to be used for the purpose of making a dynamic light generating system. By using a solid-state light source, such as a μLED, the present system can be more compact, it can employ user-friendly light intensities, and it can have improved durability.

[0010] Additionally or alternatively, by using solid state light sources, the system may provide higher light intensity, improved light efficiency and improved optical flexibility.Thus, for example, the present invention provides an optically contractible unit LCE having μLEDs.

[0011] As described above, in embodiments, a light generating system may include a plurality of first light generating devices, a flexible substrate, a first light responsive material, a second light generating device, and a control system. In the following, some general embodiments of the system are first described, followed by some more specific embodiments.

[0012] The light generating device may in particular be configured to generate device light. In particular, the light generating device may comprise a light source. The light source may in particular be configured to generate light source light. In embodiments, the device light may consist essentially of light source light. In other embodiments, the device light may consist essentially of converted light source light. In other embodiments, the device light may comprise (unconverted) light source light and converted light source light. The light source light may be converted with a luminescent material into luminescent material light and / or with an up-converter into up-converted light (see also below). The term "light generating device" may also refer to a plurality of light generating devices that may provide device light having substantially the same spectral power distribution. In specific embodiments, the term "light generating device" may also refer to a plurality of light generating devices that may provide device light having different spectral power distributions.

[0013] The term "light source" may in principle relate to any light source known in the art. It may be a conventional (tungsten) bulb, a low-pressure mercury lamp, a high-pressure mercury lamp, a fluorescent lamp, an LED (light emitting diode). In a particular embodiment, the light source comprises a solid-state LED light source (e.g. an LED or a laser diode (or "diode laser")). The term "light source" may also relate to a plurality of light sources, such as 2-2000 (solid-state) LED light sources. Thus, the term LED may also refer to a plurality of LEDs.

[0014] Furthermore, the term "light source" may also refer to a so-called chip-on-board (COB) light source in an embodiment. The term "COB" refers in particular to an LED chip in the form of a semiconductor chip, which is neither packaged nor connected, but is directly mounted on a substrate such as a PCB. Thus, a plurality of light-emitting semiconductor light sources may be configured on the same substrate. In an embodiment, a COB is a plurality of LED chips configured together as a single lighting module.

[0015] The term "light source" may also refer to a chip scale package (CSP). A CSP may include a single solid-state die on which a layer including a luminescent material is provided. The term "light source" may also refer to a mid-power package. A mid-power package may include one or more solid-state dies. (One or more) dies may be covered by a layer including a luminescent material. The die size may be equal to or less than 1 mm, such as in the range of, for example, 0.2 mm-1 mm. Therefore, in an embodiment, the light source comprises a solid-state light source. In addition, in a specific embodiment, the light source comprises a chip-scale packaged LED. Here, the term "light source" may also particularly refer to a small solid-state light source, such as having a small size or a micro size. For example, the light source may include one or more of a mini LED and a micro LED. In particular, in an embodiment, the light source may include a micro LED or "microLEDs" or "μLED". In this document, the term "small size" or "small LED" particularly indicates a solid-state light source having a size selected from the range of 100 μm-1 mm (such as a die size, in particular a length and a width). In this document, the term "μ size" or "micro LED" particularly refers to a solid-state light source having dimensions (e.g. die dimensions, in particular length and width) selected from the range of 100 μm or less. In a specific embodiment, the solid-state light source may include a cross-sectional area of ​​≤ 1.5 mm 2 LED dies, such as those with a cross-sectional area ≤ 1 mm 2 , such as cross-sectional area ≤ 0.8mm 2 In an embodiment, the solid state light source may include a 2 , such as in particular at least about 200 μm 2 , such as at least about 400 μm 2 The cross-sectional area of ​​the LED die.

[0016] The light source may have a light escape surface. For conventional light sources, such as light bulbs or fluorescent lamps, this may be the outer surface of a glass or quartz envelope. For LEDs, this may be, for example, the LED die, or, when resin is applied to the LED die, the outer surface of the resin. In principle, it may also be the end of an optical fiber. The term escape surface particularly relates to the part of the light source where the light actually leaves or escapes from the light source. The light source is configured to provide a light beam. The light beam (therefore) escapes from the light exit surface of the light source.

[0017] Likewise, the light generating device may comprise a light escape surface, such as an end window. Furthermore, likewise, the light generating system may comprise a light escape surface, such as an end window.

[0018] The term "light source" may refer to a semiconductor light emitting device, such as a light emitting diode (LED), a resonant cavity light emitting diode (RCLED), a vertical cavity laser diode (VCSEL), an edge emitting laser, etc. The term "light source" may also refer to an organic light emitting diode (OLED), such as a passive matrix (ΜMOLED) or an active matrix (AMOLED). In certain embodiments, the light source comprises a solid-state light source (such as an LED or a laser diode). In an embodiment, the light source comprises an LED (light emitting diode). The term "light source" or "solid-state light source" may also refer to a superluminescent diode (SLED).

[0019] The term LED may also refer to a plurality of LEDs.

[0020] The term "light source" may also relate to a plurality of (substantially identical (or different)) light sources, such as 2-2000 solid-state light sources. In an embodiment, the light source may comprise one or more micro-optical elements (micro-lens arrays) downstream of a single solid-state light source (such as an LED) or downstream of a plurality of solid-state light sources (e.g., shared by a plurality of LEDs). In an embodiment, the light source may comprise an LED with on-chip optics. In an embodiment, the light source comprises a pixelated single LED (with or without optics) (on-chip beam control is provided in an embodiment).

[0021] In an embodiment, the light source may be configured to provide primary radiation, which is used as such, such as a blue light source, such as a blue LED, or a green light source, such as a green LED, and a red light source, such as a red LED. Such LEDs that may not include a luminescent material ("phosphor") may be indicated as direct color LEDs.

[0022] However, in other embodiments, the light source may be configured to provide primary radiation, and components of the primary radiation are converted into secondary radiation. The secondary radiation may be based on the conversion performed by the luminescent material. The secondary radiation may therefore also be indicated as luminescent material radiation. In an embodiment, the luminescent material may be included in the light source, such as an LED having a luminescent material layer or a dome including luminescent material. Such LEDs may be indicated as phosphor conversion LEDs or PC LEDs (phosphor conversion LEDs). In other embodiments, the luminescent material may be configured at a distance ("far away") from the light source, such as an LED having a luminescent material layer that is not in physical contact with the LED die. Therefore, in a particular embodiment, the light source may be a light source that emits at least light of a wavelength selected from the range of 380nm-470nm during operation. However, other wavelengths are also possible. This light may be partially used by the luminescent material.

[0023] In an embodiment, the light generating device may include a luminescent material. In an embodiment, the light generating device may include a PCLED. In other embodiments, the light generating device may include a direct LED (i.e., without a phosphor). In an embodiment, the light generating device may include a laser device, such as a laser diode. In an embodiment, the light generating device may include a super luminescent diode. Thus, in a particular embodiment, the light source may be selected from the group of a laser diode and a super luminescent diode. In other embodiments, the light source may include an LED.

[0024] The light source may in particular be configured to generate a source light having an optical axis (O), (beam shape) and a spectral power distribution. In an embodiment, the source light may comprise one or more bands, having a bandwidth known to the laser.

[0025] The term "light source" may (thus) refer to such a light generating element, such as a solid-state light source, or for example a package of a light generating element (such as a solid-state light source), and one or more elements comprising luminescent material and (other) optics, such as lenses, collimators. A light converter element ("converter element" or "converter") may comprise luminescent material, which luminescent material comprises an element. For example, a solid-state light source such as a blue LED is a light source. A combination of a solid-state light source (as light generating element) and a light converter element (such as a blue LED and a light converter element) may also be a light source (but may also be indicated as a light generating device), the light converter element being optically coupled to the solid-state light source. Thus, a white LED is a light source (but may also be indicated as a (white) light generating device, for example).

[0026] The term "light source" herein may also refer to light sources including solid state light sources, such as LEDs or laser diodes or super luminescent diodes.

[0027] In an embodiment, the term "light source" may (therefore) also refer to a light source based on light conversion, such as a light source in combination with a luminescence conversion material. Thus, the term "light source" may also refer to a combination of an LED and a luminescent material configured to convert at least a portion of the LED radiation, or to a combination of a (diode) laser and a luminescent material configured to convert at least a portion of the (diode) laser radiation.

[0028] In an embodiment, the term "light source" may also refer to a combination of a light source (such as an LED) and an optical filter, which combination may change the spectral power distribution of the light generated by the light source. In particular, the term "light generating device" may be used to represent a light source as well as additional (optical components) such as optical filters and / or beam shaping elements, etc.

[0029] In an embodiment, the phrase "different light sources" or "multiple different light sources" and similar phrases may refer to multiple solid-state light sources selected from at least two different bins. Similarly, the phrase "same light source" or "multiple same light sources" and similar phrases may refer to multiple solid-state light sources selected from the same bin in an embodiment.

[0030] The terms "solid-state light source" or "solid-state material light source" and similar terms may particularly refer to semiconductor light sources, such as light emitting diodes (LEDs), diode lasers or superluminescent diodes.

[0031] Thus, in particular the plurality of first light generating devices may comprise one or more light sources. More particularly, in an embodiment the one or more light sources may comprise one or more solid-state light sources. In particular, the one or more light sources may be configured to generate the first light source light. The solid-state light source may be an LED, such as a micro-LED or a mini-LED (see also above and below).

[0032] In addition, in an embodiment, the light generating system may include a flexible substrate. In an embodiment, the flexible substrate may be configured to support a plurality of first light generating devices. The flexible substrate may be a substrate having elasticity. In addition, in an embodiment, the flexible substrate may include a material selected from a group including metal, polymeric material, glass, paper, 3D printing material, or a combination thereof. The material may be selected so that the flexible substrate can bend, expand, shrink, or move in another way together with the first light responsive material at least temporarily. Thus, the flexible substrate may include a material that allows the flexible substrate to undergo conformational changes. In particular, the flexible substrate may include a polymeric material. For example, in an embodiment, the flexible substrate may include a polyamide foil. In another example, the flexible substrate may include a polyethylene terephthalate (PET) foil. In other embodiments, the flexible substrate may include a silicon foil. Additionally or alternatively, the flexible substrate may include an LED strip, or may be included by the LED strip (as a support for the LED). However, the flexible substrate may also have other forms, i.e., the flexible substrate may be shaped into a sheet or 3D shape, such as a sphere. For example, in a particular embodiment, the flexible substrate may include a metal carrier sheet. In addition, the flexible substrate may have a back side and a front side (see also below). The back and front sides may be separated by a height h1. For example, in an embodiment, the height h1 may be selected from the range of 20 μm-100 mm, such as from the range of 50 μm-10 mm. For example, in an embodiment, the height h1 may be selected from the range of 5 mm and less, such as 2 mm and less, such as up to a maximum of 1 mm. In an embodiment, the height h1 may be selected from the range of at least about 40 μm, such as at least about 50 μm, such as at least about 80 μm.

[0033] In an embodiment, the first light-responsive material may include a first liquid crystal elastomer. As will be further described below, in an embodiment, the light generating system may also include a second light-responsive material. The second light-responsive material may include a second liquid crystal elastomer (different from the liquid crystal elastomer). Although the first light-responsive material and the second light-responsive material may have different properties, they are both light-responsive materials. Therefore, some embodiments of such materials (in general) are described below.

[0034] Liquid crystal elastomers (LCEs) may comprise (slightly) cross-linked liquid crystal polymer networks. These networks may combine the entropic elasticity of the elastomer with the self-organization of the liquid crystal phase. In order to produce a photoresponsive LCE, a photochromic dye may be embedded in a polymer matrix. In an embodiment, the first (and / or second) liquid crystal elastomer may comprise a liquid crystal mesogen, a cross-linking agent and a photochromic dye. In an embodiment, the cross-linking agent may be a polysiloxane. Furthermore, in an embodiment, the photochromic dye may be a dye selected from spiropyrans, spirooxazines, photochromic quinones, diarylethenes and azobenzenes. In a particular embodiment, the first (and / or second) liquid crystal elastomer may comprise at least one mesogen monomer acting as a liquid crystal, a mesogen monomer acting as a cross-linking agent and an azobenzene photochromic dye. In particular, in a specific embodiment, the first (and / or second) liquid crystal elastomer may include 4-methoxybenzoic acid 4-(6-acryloyloxyhexyloxy)phenyl ester, 1,4-bis[4-(3-acryloyloxypropoxy)benzoyloxy]-2-methylbenzene and 6-[{4-[(E)-(2-cyano-4-nitrophenyl)diazenyl]phenyl}(ethyl)amino]hexyl acrylate. In addition, in an embodiment, the first (and / or second) liquid crystal elastomer may include 5mol%-20mol% of a cross-linking agent, such as 7.5mol%-15mol% of a cross-linking agent, such as 9mol%-12mol% of a cross-linking agent. In addition, in an embodiment, the first (and / or second) liquid crystal elastomer may include 80mol%-95mol% of a liquid crystal monomer, such as 85mol%-93mol% of a liquid crystal monomer, such as 88mol%-91mol% of a liquid crystal monomer. In addition, in an embodiment, the first (and / or second) liquid crystal elastomer may include 0.1 mol%-1.5 mol% of a photochromic dye, such as 0.5 mol%-1.3 mol% of a photochromic dye, such as 0.8 mol%-1.1 mol% of a photochromic dye. Additionally or alternatively, in an embodiment, a curing agent for photoinitiation may be added. In particular, in an embodiment, about 0.5 mol%-1.5 mol% of a curing agent may be added, such as about 0.8 mol%-1.2 mol% of a curing agent. The curing agent may be, for example, Irgacure 369. However, suitable alternatives are known in the art and may be selected by a person skilled in the art.

[0035] Furthermore, in embodiments, the first light-responsive material may be responsive to radiation having a second wavelength λ2, such that the first light-responsive material may at least temporarily expand or contract under radiation having the second wavelength λ2. Under such radiation, a stretching phase may occur first, followed by a steady-state phase. Thus, radiation having a second wavelength λ2 may induce a response from the first light-responsive material. In other embodiments, such a response may also be a change in shape, size, color, or overall appearance. In certain embodiments, radiation having a second wavelength λ2 may be absorbed by the light-responsive material and may be converted into mechanical energy. The mechanical energy may generate stress, which may result in expansion or contraction. In embodiments, the radiation may have a second wavelength λ2 selected from the range of 380nm-780nm, such as 380nm-700nm, such as the range of 400nm-650nm, such as the range of 500nm-550nm. However, in other embodiments, the radiation may have a second wavelength of UV or infrared.

[0036] Furthermore, in embodiments, the first light responsive material may be arranged in contact with the flexible substrate such that expansion or contraction of the first light responsive material may result in a conformational change of the flexible substrate.

[0037] In an embodiment, the first light responsive material may be arranged in contact with the flexible substrate between the plurality of light sources and the flexible substrate. In an embodiment, the first light responsive material may (therefore) be arranged in contact with the flexible substrate at the same side as the side where the plurality of light sources are arranged. Furthermore, in an embodiment, the first light responsive material may be arranged in contact with the flexible substrate at a side facing away from the plurality of light sources.

[0038] Furthermore, in specific embodiments, the expansion or contraction of the first light responsive material may generate stress on the flexible substrate. The stress on the flexible substrate may result in a conformational change of the flexible substrate. In embodiments, the conformational change may include bending, folding, wrinkling, stretching, and thinning of the flexible substrate (see also below).

[0039] In an embodiment, the second light generating device may comprise one or more (solid-state) light sources (see also above and below). In particular, the one or more light sources may be configured to generate the second light source light. Furthermore, in an embodiment, the second light generating device may be configured to generate the second device light. In an embodiment, the second device light may comprise at least a portion of the second (solid-state) light source light. In an embodiment, the second light generating device may further be configured to generate the second device light having a second spectral power distribution comprising an intensity at the second wavelength λ2. In particular, in an embodiment, the first light responsive material may be configured to be in a light receiving relationship with the second light generating device. More particularly, in an embodiment, the second light generating device may be configured to provide the second device light having a spectral power distribution comprising an intensity at the second wavelength λ2 onto the surface of the first light responsive material so as to provide an optical stimulus. The first light responsive material may receive the stimulus provided by the second light generating device and, in response, may at least temporarily undergo an expansion or contraction (see also above). Furthermore, in an embodiment, the first device light may in particular not provide a stimulus to the first light responsive material. In particular, the first device light may not comprise an intensity at the second wavelength λ2.

[0040] Thus, in an embodiment, there is substantially no spectral overlap between the first device light and the second device light.

[0041] In an embodiment, the light generating system may be configured to generate system light. The system light may include at least a portion of the first device light. In addition, the system light may substantially exclude the second device light (or the third device light (see below)). Thus, the device light for controlling the (one or more) photoresponsive materials may be substantially excluded from the system light. For example, less than 5%, such as less than 1%, of the spectral power of the system light may consist of the device light for controlling the (one or more) photoresponsive materials. However, in an embodiment, at least 95% of the spectral power of the system light may consist of the first device light.

[0042] Due to the illumination or non-illumination of the first light-responsive material with the second device light, the first light-responsive material will be in a contracted state or an expanded state when illuminated, and in an expanded state or a contracted state when not illuminated by the second device light. In this way, the position of one or more light generating devices can be temporarily displaced. This can have an impact on the beam of system light, because the sub-beams of the first light generating device can be temporarily displaced and / or provided at different angles depending on the contracted state or the expanded state. Therefore, the beam shape and / or beam direction of the beam of system light can be controlled (using the second device light).

[0043] In an embodiment, the control system may be configured to control one or more of the beam shape and the beam direction of the beam of system light by controlling the second light generating device (and optionally the third light generating device (see below)).

[0044] The term "control" and similar terms refer in particular at least to determining the behavior of an element or supervising the operation of an element. Therefore, "control" and similar terms herein may, for example, refer to applying behavior (determining the behavior or supervising the operation of an element) to an element, such as measuring, displaying, starting, opening, shifting, changing temperature, etc. In addition, the term "control" and similar terms may also include monitoring. Therefore, the term "control" and similar terms may include applying behavior to an element, and applying behavior to an element and monitoring the element. The control of the element may be accomplished with a control system, which may also be indicated as a "controller". Therefore, the control system and the element may be functionally coupled at least temporarily or permanently. The element may include a control system. In an embodiment, the control system and the element may not be physically coupled. Control may be accomplished via wired and / or wireless control. The term "control system" may also refer to a plurality of different control systems, which are particularly functionally coupled, and wherein, for example, one control system may be a master control system, and one or more other control systems may be slave control systems. The control system may include or may be functionally coupled to a user interface.

[0045] The control system may also be configured to receive and execute instructions from a remote control. In an embodiment, the control system may be controlled via an application on a device, such as a portable device, such as a smartphone or I-phone, a tablet computer, etc. Thus, the device does not have to be coupled to the lighting system, but may be (temporarily) functionally coupled to the lighting system.

[0046] Thus, in an embodiment, the control system may (also) be configured to be controlled by an application on a remote device. In such embodiments, the control system of the lighting system may be a slave control system or a control in slave mode. For example, the lighting system may be identified with a code, in particular a unique code for the respective lighting system. The control system of the lighting system may be configured to be controlled by an external control system, which accesses the lighting system based on the knowledge of the (unique) code (via a user interface input of an optical sensor (e.g. a QR code reader)). The lighting system may also include devices for communicating with other systems or devices, such as based on Bluetooth, WIFI, LiFi, ZigBee, BLE or WiMAX or other wireless technologies.

[0047] A system or device or apparatus may perform actions in a "mode" or "operating mode" or "mode of operation" or "operational mode". The term "operational mode" may also be indicated as a "control mode". Likewise, in a method, an action or phase or step may be performed in a "mode" or "operating mode" or "mode of operation" or "operational mode". This does not exclude that the system or device or apparatus may also be adapted to provide another control mode or multiple other control modes. Likewise, this does not exclude that one or more other modes may be performed before and / or after the execution of this mode.

[0048] However, in an embodiment, a control system may be available which is adapted to provide at least a control mode. If other modes are available, the selection of such modes may in particular be performed via a user interface, although other options are also possible, such as performing a mode dependent on a sensor signal or a (time) scheme. In an embodiment, an operating mode may also refer to a system or device or apparatus that can only be operated in a single operating mode (i.e. "switched on", without further tunability).

[0049] In certain embodiments, the control system may be controlled depending on one or more of an input signal of a user interface, a sensor signal (of a sensor), and a timer. The term "timer" may refer to a clock and / or a predetermined time scheme. The user may, for example, instruct the control system to change the beam shape through a user interface. As a result, the control system may adjust the operational mode of the second device light accordingly, so that the conformation of the first light-responsive material (and / or) the second light-responsive material may change, resulting in a change in the beam shape. Similarly, the user may also instruct the control system (via the user interface) to change the beam direction. In addition, in an embodiment, the control system may respond to a sensor signal, such as a sensor signal generated when an individual passes by a sensor of the control system. Therefore, in an embodiment, the control system may include a sensor that may send a signal as a response to a passing individual. The signal may, for example, cause the control system to control the second light generating device to be turned on or off. In another example, the control system may be configured to control the operating mode of the second light generating device based on a timer, for example, the control system may turn on the second light generating device for a set period of time, or the control system may turn off the second light generating device at a set sleep time.

[0050] Some additional embodiments are described below.

[0051] In an embodiment, the light generating system may provide a first device light. In particular, the first device light may have a first spectral power distribution that substantially has no intensity at the second wavelength λ2, i.e., less than 0.1% of its spectral power. Therefore, in an embodiment, the first light generating device and the first light responsive material (and optionally the second light responsive material) may be selected and configured such that the first light responsive material (and optionally the second light responsive material) does not respond to the first device light of the first light generating device.

[0052] A first device light having a first spectral power distribution without an intensity at the second wavelength λ2 may be advantageous because it may allow the light generating system to be used without affecting the first device light when controlling the photo-responsive material(s).

[0053] Since the system includes multiple first light generating devices and a control system, multiple first light generating devices can be controlled individually. In a specific embodiment, multiple groups, each with at least one individual first light generating device, can be controlled individually. All first light generating devices can be configured to generate first device light with substantially the same spectral power distribution. In other embodiments, two or more first light generating devices are configured to generate first device light with different spectral power distributions. Therefore, the color point of the first device light of two or more first light generating devices can be different.

[0054] In a particular embodiment, the color or color point of the first type of light and the second type of light may be different when the corresponding color points of the first type of light and the second type of light differ by at least 0.01 for u' and / or by at least 0.01 for v', even more particularly by at least 0.02 for u' and / or by at least 0.02 for v'. In a more specific embodiment, the corresponding color points of the first type of light and the second type of light may differ by at least 0.03 for u' and / or by at least 0.03 for v'. Here, u' and v' are the color coordinates of the light in the CIE 1976 UCS (Uniform Chromaticity Scale) diagram.

[0055] In an embodiment, the two or more first light generating devices are configured to generate first device light with different colors.In (other) embodiments, the two or more first light generating devices are configured to generate first device light with different correlated color temperatures, such as differing by at least about 500K.

[0056] In embodiments, the first light generating device and the second light generating device may be operated simultaneously, which allows for a dynamic light generating system. In (other) embodiments, it is also possible to operate only the first light generating device and not the second light generating device, which allows for a static light generating system.

[0057] In an embodiment, the first light generating device may generate a first device light. In particular, in an embodiment, the first device light may have a first spectral power distribution having an intensity in the visible wavelength range. Additionally or alternatively, the first spectral power distribution may have an intensity outside the visible wavelength range, such as in the UV or IR wavelength range. More particularly, the first spectral power distribution may not have an intensity at the second wavelength λ2, i.e. less than 0.1% of its spectral power, such as less than 0.05% of its spectral power, such as less than 0.01% of its spectral power.

[0058] In an embodiment, the light generating system may provide system light. As described above, in an embodiment, the system light may consist essentially of the first device light. In an embodiment, the system light may have a system light optical axis Os. The system light optical axis Os may be defined as an imaginary line that defines a path through the flexible substrate and the light responsive material of the light generating system along which the system light propagates through the system. In particular, the system light optical axis Os may coincide with the direction of the system light having the highest radiant flux.

[0059] Furthermore, in an embodiment, the second device light may have a second optical axis O2. In particular, the second optical axis O2 may be defined as an imaginary line defining a path through the second light generating device along which the second device light propagates through the device. More particularly, in an embodiment, the second optical axis O2 may coincide with the direction of the second device light having the highest radiant flux.

[0060] Furthermore, in an embodiment, the system optical axis Os and the second optical axis O2 may have a first mutual angle α1. In particular, in an embodiment, α1 may be selected from the range of 145°-225°. With the present system, the light receiving relationship between the first light responsive material and the second light generating device may be improved. The described angle allows to optimize the amount of spectral intensity that the first light responsive material may receive, thereby optimizing the response of the first light responsive material. More particularly, the first mutual angle α1 may be selected from the range of 160°-210°, such as from the range of 170°-190°. This is particularly applicable when the second light generating device is configured to face the front.

[0061] The flexible substrate may have a front side and a back side. The front side of the flexible substrate may be defined as a surface on which the plurality of first light generating devices are arranged. Thus, the front side may face the same direction in which the first device light propagates from the plurality of first light generating devices. Thus, the back side may be defined as a surface of the flexible substrate that faces in a direction opposite to the direction in which the first device light propagates from the plurality of first light generating devices.

[0062] In alternative embodiments, the flexible substrate may be transmissive to the second device light. For example, in an embodiment, the second light generating device may be configured facing the back side of the flexible substrate, and the first light responsive material may be configured on the front side of the flexible substrate. In such cases, the second device light may enter from the back side and pass through the transmissive flexible substrate.

[0063] Furthermore, in alternative embodiments, the second light generating device may be configured to face the front side of the flexible substrate, and the first light responsive material may be configured on the back side of the flexible substrate opposite the front side. Thus, in embodiments, the second device light may enter the front side and pass through the transmissive flexible substrate.

[0064] As described above, in embodiments, the system light optical axis Os may have a position and / or angle that may depend on the first light responsive material (or more specifically, whether the first light responsive material is illuminated by the second device light).

[0065] In an embodiment, the light generating system may thus comprise a second light generating device. In particular, in an embodiment, the second light generating device may be configured to generate a second device light. In particular, in an embodiment, the second light generating device may comprise a solid state light source. Furthermore, in an embodiment, the second device light may have a power selected from 15 mW / cm 2 -60mW / cm 2 The radiant flux in the range is selected from 30 mW / cm 2 -50mW / cm 2 Range, such as 35mW / cm 2 -40mW / cm 2 This range of irradiation onto the photoresponsive material can benefit the flexibility of the system as it can help optimize the stress generated in the photoresponsive material. 35mW / cm at 20℃-25℃ 2 -40mW / cm 2 The irradiance can generate up to 80mN / cm 2 of stress.

[0066] Thus, in a particular embodiment, the light generating system may include a second light generating device and a plurality of first light generating devices, wherein the second light generating device may include a solid-state light source; and wherein the plurality of first light generating devices may be configured to generate a first device light having an intensity at one or more wavelengths within the visible wavelength range, including at a first wavelength λ1.

[0067] The second light generating device may include one or more light sources. In an embodiment, the one or more light sources may include a solid-state light source (see also above). In particular, the one or more light sources may be configured to generate the second light source light. Furthermore, in an embodiment, the second light generating device may be configured to generate the second device light. In an embodiment, the second device light may include at least a portion of the second light source light.

[0068] In addition, in an embodiment, a plurality of first light generating devices may be configured to generate a first device light. In an embodiment, the first device light may include at least a portion of the light source light. In addition, in an embodiment, the first device light may have an intensity at one or more wavelengths in the visible wavelength range, including the first wavelength λ1. In particular, in an embodiment, the first device light may have an intensity at one or more wavelengths selected from the range of 380nm-780nm, such as 380nm-700nm. In an embodiment, the first device light may be white light. In a specific embodiment, at least 80%, such as at least about 90%, of the spectral power of the first device light may be within the visible wavelength range of 380nm-780nm. However, other embodiments are also possible.

[0069] As described above, the system light may include at least a portion of the first device light. In certain embodiments, the system light may consist essentially of the first device light. Thus, in certain embodiments, the system light may be white light.

[0070] The term "white light" herein is known to the person skilled in the art. For general lighting, in particular in the range of about 2700K and 6500K, it particularly relates to light with a correlated color temperature (CCT) between about 1800K and 20000K, such as between 2000K and 20000K, in particular 2700K-20000K. In an embodiment, for example for the purpose of backlighting, the correlated color temperature (CCT) may in particular be in the range of about 7000K and 20000K. Furthermore, in an embodiment, the correlated color temperature (CCT) is in particular within about 15SDCM (standard deviation of color matching) from the BBL (black body locus), in particular within about 10SDCM from the BBL, even more in particular within about 5SDCM from the BBL. In particular, in an embodiment, the system light may be warm white light. Additionally or alternatively, in an embodiment, the system light may be cool white light. Furthermore, in an embodiment, the system light may have a correlated color temperature selected from the range of 1800K-20000K, such as a correlated color temperature selected from the range of 5000K-20000K, such as a correlated color temperature selected from the range of 1800K-12000K. Additionally or alternatively, the system light may have a color rendering index selected from the range of ≥70, such as selected from the range of ≥80, such as selected from the range of ≥85. However, the system light may also be colored light (see also below).

[0071] As described above, the light generating system may include a flexible substrate. In particular, in an embodiment, the flexible substrate may include a flexible printed circuit board (PCB). In an embodiment, the flexible substrate may include a flexible board or a semi-rigid board with elastic properties, in particular a flexible board. In other embodiments, the flexible substrate may be a flexible PCB.

[0072] With the present system, a light generating system with low production costs can be provided, since the PCB can be obtained at low cost. Another advantage provided by using the PCB as a flexible support is that the PCB can be obtained by electronic 3D printing.

[0073] Some more specific embodiments of the system are described below.

[0074] In an embodiment, the plurality of first light generating devices may be at least partially embedded in the first light responsive material. Embedding the plurality of first light generating devices in the first light responsive material may provide the benefit of increased system stability. When embedded in the first light responsive material, the plurality of first light generating devices may be attached in a more secure manner. Another advantage of embedding the plurality of first light generating devices in the first light responsive material is increased compactness of the light generating system.

[0075] In embodiments, the light emitting surface of the first light generating device may not be embedded in the first light responsive material. In further embodiments, the first light responsive material may be transmissive to the first device light. In such embodiments, the first light generating device may be completely embedded in the first light responsive material. In further embodiments, the first light generating device may not be embedded in the first light responsive material.

[0076] In an embodiment, the light generating system may include a first light responsive material. In particular, in an embodiment, the first light responsive material may include one or more of (a) polycarbonate, poly(methyl methacrylate) (PMMA), glass, (b) liquid crystal elastomer, and optionally (c) hydrogel. Therefore, in a specific embodiment, the light generating system may include a first light responsive material, wherein the first light responsive material may include one or more of (i) polycarbonate (PC), polymethyl methacrylate (PMMA), glass, (b) liquid crystal elastomer (LCE), and (c) hydrogel.

[0077] In particular, in an embodiment, a plurality of first light generating devices may be configured in an array. More particularly, a plurality of first light generating devices may be configured in an array of solid-state light sources. Configuring the solid-state light sources in an array may provide the advantage of easy (uniform) distribution of light over the flexible substrate area. Another advantage of configuring the solid-state light sources in an array may be the simplification of the assembly process. Using an array of solid-state light sources may eliminate the need to place individual solid-state light sources on the flexible substrate.

[0078] The array may be regular, random or quasi-random. In particular, in an embodiment, the array of the first light generating device may be a regular 2D array. However, other arrays, such as leaf sequence mosaics or sunflower mosaics are also possible. In particular, the array may be a regular array. In an embodiment, the array may be an n*m array, wherein n and m are each independently selected from a range of at least 2. In a specific embodiment, n and m are each independently selected from a range of 2-5. Therefore, in an embodiment, there may be one or two constant pitches. The term "tessellation" in this article refers in particular to a pattern of (repeated) shapes that fit together tightly without gaps or overlaps, in particular polygons. In other embodiments, the array may be an irregular 2D array.

[0079] As described above, the plurality of first light generating devices may comprise solid state light sources. Furthermore, in embodiments, the solid state light sources may be LEDs, such as micro-LEDs or mini-LEDs. In particular, in embodiments, the solid state light sources may be configured in an array.

[0080] In an embodiment, the light generating system may include a flexible substrate. In particular, in an embodiment, the flexible substrate depending on the second device light may include at least a first conformation, in which the flexible substrate may have a first radius r1. Furthermore, the flexible substrate depending on the second device light may include at least a second conformation, in which the flexible substrate may have a second radius r2. Furthermore, in an embodiment, r1 / r2≥1.1 or r1 / r2≤0.9.

[0081] When the flexible substrate is substantially planar, the radius r1=∞ or the radius r2=∞. Thus, in a particular embodiment, the first radius r1 may be infinite, i.e., the first conformation of the flexible substrate may be planar. In another particular embodiment, the second radius r2 may be infinite, i.e., the second conformation of the flexible substrate may be planar. In yet another particular embodiment, both the first radius r1 and the second radius r2 may be finite, i.e., both the first conformation of the flexible substrate and the second conformation of the flexible substrate may be non-planar.

[0082] Using the present system, a dynamic light generating system can be provided.Another advantage is that the present system can be programmed to switch between a plurality of different scenes with different flexible substrate conformations.

[0083] The flexible substrate may include a material that allows the flexible substrate to undergo a conformational change. In an embodiment, the first light-responsive material may be arranged in contact with the flexible substrate such that expansion or contraction of the first light-responsive material may result in a conformational change of the flexible substrate. In a particular embodiment, the expansion or contraction of the first light-responsive material may generate stress in the flexible substrate, which may result in a conformational change of the flexible substrate. In an embodiment, the conformational change may be bending of the flexible substrate into a convex conformation or a concave conformation. Thus, the conformational change may also be bending of the flexible substrate from a convex conformation or a concave conformation to a less convex or less concave conformation, or even completely stretching into a substantially planar conformation.

[0084] In an embodiment, the light generating system may comprise an optical component. In particular, in an embodiment, the optical component may be configured downstream of the plurality of first light generating devices. The optical component may be configured to change one or more of a shape and a size of a beam of system light.

[0085] The terms "upstream" and "downstream" relate to the arrangement of items or features relative to the propagation of light from a light generating equipment (here in particular a light source), wherein, relative to a first position in a light beam from the light generating equipment, a second position in the light beam closer to the light generating equipment is "upstream" and a third position in the light beam further away from the light generating equipment is "downstream".

[0086] In an embodiment, the optical component may be selected from a lens, a reflector, a collimator and a light guide. The term "optical device" may specifically refer to (one or more) optical components. Therefore, the terms "optical device" and "optical component" may refer to the same item. The optical device may include one or more of the following items: a lens, a reflector, a collimator, a light guide, a mirror, a prism, a diffuser, a phase plate, a polarizer, a diffraction element, a grating, a dichroic mirror, an array of one or more of the above elements, etc. Alternatively or additionally, the term "optical device" may refer to a holographic element or a mixing rod. In an embodiment, the optical device may include one or more beam expander optics and zoom lens optics. For examples of optical devices, see above. In an embodiment, the optical device may include an integrator, such as a "Köhler integrator" (or " Integrator”).

[0087] In particular, in an embodiment, at least one of the plurality of first light generating devices may be configured to provide a first device light having a first optical axis Od1. The first optical axis Od1 may be defined as an imaginary line defining a path through the first light generating device along which the system light propagates through the system. In particular, the first optical axis Od1 may be consistent with the direction of the first device light having the highest radiant flux. Furthermore, in an embodiment, the optical component may have an optical component optical axis Oc1. Furthermore, in an embodiment, the control system may be configured to control one or more of the following items by controlling the second light generating device: (i) a second mutual angle α2 between the first optical axis Od1 and the optical component optical axis Oc1, and (ii) a first distance d1 between the first optical axis Od1 and the optical component optical axis Oc1. Thus, in certain embodiments, the light generating system may include a plurality of first light generating devices, wherein at least one of the plurality of first light generating devices may be configured to provide a first device light having a first optical axis Od1, wherein the optical component may have an optical component optical axis Oc1, wherein the control system may be configured to control one or more of the following items by controlling the second light generating device: (i) a second mutual angle α2 between the first optical axis Od1 and the optical component optical axis Oc1, and (ii) a first distance d1 between the first optical axis Od1 and the optical component optical axis Oc1. Thus, using the present system, the beam size, beam direction, and beam intensity of the light beam generated by the system may be customized.

[0088] In particular, in an embodiment, the first optical axis Od1 and the optical component optical axis Oc1 may intersect to form a mutual angle α2. The mutual angle α2 may be an angle selected from the range of 0°-180°, such as the range of 0°-90°, such as the range of 0°-45°, in particular the range of 5°-45°. In a particular embodiment, the first optical axis Od1 and the optical component optical axis Oc1 may coincide, i.e. the mutual angle α2 may be 0°.

[0089] In an embodiment, the first optical axis Od1 and the optical component optical axis Oc1 may be separated by a first distance d1. In a particular embodiment, the first distance d1 between the first optical axis Od1 and the optical component optical axis Oc1 may be zero, ie, the first optical axis Od1 and the optical component optical axis Oc1 may coincide.

[0090] In an embodiment, stretching and contraction may result in a length difference selected from the range of 1 μm-150 μm, such as particularly about 1 μm-100 μm, such as 150 μm, particularly 25 μm-50 μm. Thus, in an embodiment, the first distance varies by a maximum of about 100 μm.

[0091] Furthermore, in an embodiment, the first optical axis Od1 and the optical component optical axis Oc1 may simultaneously have a non-zero mutual angle α2 and a non-zero first distance d1 .

[0092] In certain embodiments, the flexible substrate may be fixed at one end such that a conformational change of the flexible substrate may result in expansion or contraction in one direction.

[0093] In addition, in an embodiment, the control system may be configured to control one or more of a second mutual angle α2 between the first optical axis Od1 and the optical axis Oc1 of the optical component and a first distance d1 between the first optical axis Od1 and the optical axis Oc1 of the optical component by controlling the second light generating device. For example, in a first operational mode, the control system may be configured to control the second device so that the second device light may cause the first light-responsive material to adopt a relaxed conformation. In this relaxed conformation, in an embodiment, the mutual angle α2 may be 0° and the first distance d1 may be non-zero. In a second operational mode, the control system may be configured to control the second device so that the second device light may cause the first light-responsive material to adopt an expanded conformation due to the generated stress. In this expanded conformation, in an embodiment, the mutual angle α2 may be 0° and the first distance d1 may be 0°. Therefore, the first optical axis Od1 and the optical axis Oc1 of the optical component may coincide. It may be clear to a person skilled in the art that other variations are possible with respect to the operational mode, the mutual angle α2 and the first distance d1.

[0094] In an embodiment, the light generating system may further include a third light generating device and a second light responsive material. Substantially all embodiments related to the second light generating device may also be applied to the third light generating device, such as position, angle, etc. In addition, substantially all embodiments related to the first light responsive material may also be applied to the second light responsive material. However, in particular, the effect on the substrate variation may be different for: on the one hand, the combination of the second light generating device and the first light responsive material, and on the other hand, the combination of the third light generating device and the second light responsive material. Below, some embodiments are also described.

[0095] In particular, in an embodiment, the second light responsive material may include a second liquid crystal elastomer. In addition, in an embodiment, the second light responsive material may be responsive to radiation having a third wavelength λ3, such that the second light responsive material may at least temporarily expand or contract under radiation having the third wavelength λ3. In addition, in an embodiment, the second light responsive material may be arranged in contact with the flexible substrate or in contact with the first light responsive material, such that expansion or contraction of the second light responsive material may cause a conformational change in the flexible substrate. In particular, in an embodiment, the second wavelength may not be equal to the third wavelength, i.e. λ2≠λ3. In addition, in an embodiment, the first light responsive material and the second light responsive material may have light responsiveness in different directions. In addition, in an embodiment, the third light generating device may be configured to generate a third device light. In particular, in an embodiment, the third light generating device may include a solid-state light source. In addition, in an embodiment, relative to the surface of the second (and / or first) light responsive material, the third device light may have a selected from 15mW / cm 2 -60mW / cm 2 The radiant flux in the range is selected from 30 mW / cm 2 -50mW / cm 2 Range, such as 35mW / cm 2 -40mW / cm 2 range. More particularly, in an embodiment, the third device light may have a third spectral power distribution including an intensity at a third wavelength λ3. Furthermore, in an embodiment, the second light responsive material may be configured to be in a light receiving relationship with the third light generating device. Furthermore, in an embodiment, the control system may be configured to control one or more of a beam shape and a beam direction of a beam of the system light by controlling the second light generating device and the third light generating device. Furthermore, in an embodiment, the first device light may not provide stimulation to the second light responsive material. Furthermore, in an embodiment, the light generating system may provide the first device light. In particular, the first device light may have a first spectral power distribution that does not have an intensity at the third wavelength λ3, i.e., less than 0.1% of its spectral power.

[0096] Thus, in certain embodiments, a light generating system may include a third light generating device and a second light responsive material; wherein the second light responsive material may include a second liquid crystal elastomer, wherein the second light responsive material may be responsive to radiation having a third wavelength λ3 such that the second light responsive material may at least temporarily expand or contract under radiation having the third wavelength λ3, wherein the second light responsive material may be arranged in contact with the flexible substrate or in contact with the first light responsive material such that expansion or contraction of the second light responsive material may cause a conformational change of the flexible substrate, wherein λ2≠λ3; wherein the first light responsive material and the second light responsive material may have light responsiveness that may be different in direction; wherein the third light generating device may be configured to generate a third device light, wherein the third device light may have a third spectral power distribution including an intensity at the third wavelength λ3; wherein the second light responsive material may be configured to be in a light receiving relationship with the third light generating device; and wherein the control system may be configured to control one or more of a beam shape and a beam direction of a beam of the system light by controlling the second light generating device and the third light generating device.

[0097] Using the present system, a dynamic light generating system can be provided that can respond to multiple stimuli. Since the light generating system can respond to multiple stimuli, it can also be dynamic in multiple directions or dimensions.

[0098] In an embodiment, the second photo-responsive material may be responsive to radiation having a third wavelength λ3, such that the second photo-responsive material may at least temporarily expand or contract under radiation having the third wavelength λ3. Under such radiation, a stretching phase may occur first, followed by a steady-state phase. Thus, radiation having a third wavelength λ3 may induce a response from the second photo-responsive material. In other embodiments, such a response may also be a change in shape, size, color, or overall appearance. In a particular embodiment, radiation having a third wavelength λ3 may be absorbed by the photo-responsive material and may be converted into mechanical energy. The mechanical energy may generate stress, which may result in expansion or contraction. In an embodiment, the radiation may have a third wavelength λ3 selected from the range of 380nm-780nm, such as 380nm-700nm, such as the range of 400nm-650nm, such as the range of 500nm-550nm. In particular, the third wavelength λ3 may be selected such that λ2≠λ3. However, in other embodiments, the radiation may have a third wavelength of UV or infrared.

[0099] In addition, in an embodiment, the second light responsive material may be arranged to contact the flexible substrate so that expansion or contraction of the second light responsive material may cause a conformational change of the flexible substrate. In particular, in an embodiment, the second light responsive material may be arranged to contact the flexible substrate between the plurality of light sources and the flexible substrate. In addition, in an embodiment, the second light responsive material may be arranged to contact the flexible substrate on a side away from the plurality of light sources. Additionally or alternatively, in an embodiment, the second light responsive material may be arranged to contact the first light responsive material so that expansion or contraction of the second light responsive material may cause a conformational change of the flexible substrate. In a specific embodiment, the expansion or contraction of the second light responsive material may generate stress on the flexible substrate. The stress on the flexible substrate may cause a conformational change of the flexible substrate. In an embodiment, the first light responsive material and the second light responsive material may be arranged on the same side of the flexible substrate. However, in other embodiments, the first light responsive material and the second light responsive material may be arranged on opposite sides of the flexible substrate. Additionally or alternatively, the first light responsive material and the second light responsive material may be arranged together in a mixed layer.

[0100] In embodiments, the conformational change may include bending, folding, wrinkling, stretching, and thinning of the flexible substrate (see also above and below).

[0101] In embodiments, the first light-responsive material and the second light-responsive material may have light responsiveness that is in different directions. In embodiments, the first light-responsive material may have a light responsiveness that causes it to contract, while the second light-responsive material may have a light responsiveness that causes it to expand, or vice versa. Additionally or alternatively, in embodiments, the first light-responsive material and the second light-responsive material may have light responsiveness that causes similar changes, i.e. contraction or expansion, but on non-parallel axes. In this way, for example, rotational movement may be performed.

[0102] In an embodiment, the third light generating device may include one or more light sources (see also above and below). In particular, the one or more light sources may be configured to generate a third light source light. Furthermore, in an embodiment, the third light generating device may be configured to generate a third device light. In an embodiment, the third device light may include at least a portion of the third light source light. In an embodiment, the third light generating device may also be configured to generate a third device light having a third spectral power distribution including an intensity at a third wavelength λ3. In particular, in an embodiment, the second light responsive material may be configured to be in a light receiving relationship with the third light generating device. More particularly, in an embodiment, the third light generating device may be configured to provide a third device light having a spectral power distribution including an intensity at a third wavelength λ3 onto a surface of the second light responsive material in order to provide a stimulus. The second light responsive material may receive the stimulus provided by the third light generating device and, in response, may at least temporarily undergo expansion or contraction (see also above). Furthermore, in an embodiment, the first device light may not particularly provide a stimulus to the first light responsive material. In particular, the first device light may not include an intensity at the second wavelength λ3.

[0103] Furthermore, in an embodiment the control system may be configured to control one or more of the beam shape and the beam direction of the beam of system light by controlling the second light generating device and the third light generating device (see also above).

[0104] Furthermore, in an embodiment, the light generating system may provide a first device light. In particular, the first device light may have a first spectral power distribution, which does not have an intensity at the second wavelength λ3, i.e., less than 0.1% of its spectral power. Thus, in a particular embodiment, the light generating system may provide a first device light, wherein the first device light may have a first spectral power distribution, which does not have an intensity at the second wavelength λ2 and does not have an intensity at the third wavelength λ3, i.e., less than 0.1% of its spectral power. In particular, the first spectral power distribution may not have an intensity at the second wavelength λ2, i.e., less than 0.1% of its spectral power, such as less than 0.05% of its spectral power, such as less than 0.01% of its spectral power. More particularly, the first spectral power distribution may not have an intensity at the third wavelength λ3, i.e., less than 0.1% of its spectral power, such as less than 0.05% of its spectral power, such as less than 0.01% of its spectral power.

[0105] In yet another aspect, the present invention also provides a lamp or illuminator comprising a light generating system as defined herein. The illuminator may also include a housing, an optical element, a shutter, etc. The lamp or illuminator may also include a housing that encapsulates the light generating system. The lamp or illuminator may include a light window or housing opening in the housing, through which the system light escapes from the housing. In yet another aspect, the present invention also provides a projection device, which includes the light generating system defined herein. In particular, a projection device or "projector" or "image projector" may be an optical device that projects an image (or moving image) onto a surface, such as a projection screen. The projection device may include one or more light generating systems, such as described herein. The lighting device is selected from the group of items: a lamp, an illuminator, a projector device, a disinfection device, a photochemical reactor, and an optical wireless communication device, which includes a light generating system as defined herein. The lighting device may include a housing or carrier configured to accommodate or support one or more elements of the light generating system. For example, in an embodiment, the lighting device may include a housing or carrier configured to accommodate or support one or more light sources.

[0106] The present invention also provides an arrangement of two or more lighting systems or two or more lighting devices, such as a grid of lamps or luminaires. Such a grid may be mounted on a roof or ceiling. In an embodiment, the lighting device may be functionally connected to a control system. In an embodiment, the lighting device in the grid may include a sensor, in particular one or more of a radiation sensor and an airflow sensor. In an embodiment, the lighting device may adjust its settings based on one or more sensor signals of one or more lighting devices. In an embodiment, the lighting devices, in particular their control systems, may communicate with each other. The lighting device may include equipment for communicating with other units, systems or devices, such as based on Bluetooth, WIFI, LiFi, ZigBee, BLE or WiMAX or other wireless technologies.

[0107] Instead of the term "lighting device" or "lighting system" and similar terms, the term "light generating device" or "light generating system" and similar terms may also be applied. A lighting device or lighting system may be configured to generate device light (or "lighting device light") or system light (or lighting system light). As mentioned above, the terms light and radiation may be used interchangeably.

[0108] The lighting device may include a light source. In an embodiment, the device light may include one or more of a light source light and a converted light source light (such as a luminescent material light).

[0109] The lighting system may include a light source. In an embodiment, the system light may include one or more of a light source light and a converted light source light (such as a luminescent material light).

[0110] The light generating system may be, for example, a component of an office lighting system, a home application system, a shop lighting system, a home lighting system, an accent lighting system, a spotlight lighting system, a theatre lighting system, a fibre optics application system, a projection system, a self-luminous display system, a pixelated display system, a segmented display system, a warning sign system, a medical lighting application system, an indicator sign system, a decorative lighting system, a portable system, an automotive application, a (outdoor) road lighting system, a city lighting system, a greenhouse lighting system, a horticultural lighting, a digital projection or an LCD backlight, or may be applied therein. The light generating system (or illuminator) may be, for example, a component of an optical communication system or a disinfection system, or may be applied therein.

[0111] The terms "visible", "visible light" or "visible emission" and similar terms refer to light having one or more wavelengths in the range of about 380nm-780nm. In this document, UV may particularly refer to wavelengths selected from the range of 190nm-380nm, such as 200nm-380nm. The terms "light" and "radiation" are used interchangeably herein, unless it is clear from the context that the term "light" refers only to visible light. The terms "light" and "radiation" may therefore refer to UV radiation, visible light and IR radiation. In certain embodiments, in particular for lighting applications, the terms "light" and "radiation" refer to (at least) visible light.

[0112] The phrase "light having one or more wavelengths within a wavelength range" and similar phrases may particularly indicate that the indicated light (or radiation) has a spectral power distribution with one or more intensities at least at these one or more wavelengths within the indicated wavelength range. For example, a solid-state light source emitting blue light will have a spectral power distribution with intensities at one or more wavelengths within the wavelength range of 440nm-495nm.

[0113] A system or device or apparatus may perform actions in a "mode" or "mode of operation" or "mode of operation" or "operational mode". The term "operational mode" may also be indicated as a "control mode". Likewise, in a method, an action or phase or step may be performed in a "mode" or "mode of operation" or "operational mode". This does not exclude that the system or device or apparatus may also be adapted to provide another control mode or multiple other control modes. Likewise, this does not exclude that one or more other modes may be performed before and / or after the execution of this mode.

[0114] However, in an embodiment, a control system may be available which is adapted to provide at least a control mode. If other modes are available, the selection of such modes may in particular be performed via a user interface, although other options are also possible, such as performing a mode dependent on a sensor signal or a (time) scheme. In an embodiment, an operating mode may also refer to a system or device or apparatus that can only be operated in a single operating mode (i.e. "switched on", without further tunability).

[0115] Thus, in an embodiment, the control system may be controlled depending on one or more of an input signal of a user interface, a sensor signal (of a sensor) and a timer.The term "timer" may refer to a clock and / or a predetermined time scheme. BRIEF DESCRIPTION OF THE DRAWINGS

[0116] Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which corresponding reference numerals indicate corresponding parts, and in which:

[0117] Figure 1A-Figure 1C and Figure 2 Schematically depicts embodiments of the invention and some general aspects; and

[0118] Figure 3 Embodiments of applications are schematically depicted.

[0119] The schematic drawings are not necessarily drawn to scale. DETAILED DESCRIPTION

[0120] refer to Figure 1A-Figure 1C , schematically depicting an embodiment of the present invention. In an embodiment, the present invention may be a light generating system 1000 comprising a plurality of first light generating devices 110 , a flexible substrate 30 , a first light responsive material 1040 , a second light generating device 120 and a control system 300 .

[0121] In particular, in an embodiment, the plurality of first light generating devices 110 may include one or more solid-state light sources. More particularly, in an embodiment, the plurality of first light generating devices 110 may be configured to generate first device light 111. Furthermore, in an embodiment, the first device light 111 may have an intensity at one or more wavelengths in the visible wavelength range, including the first wavelength λ1. In an embodiment, the plurality of first light generating devices 110 may be at least partially embedded in the first light responsive material 1040. Additionally or alternatively, in an embodiment, the plurality of first light generating devices 110 may be configured in an array. In a specific embodiment, the plurality of first light generating devices 110 may be configured in an array of solid-state light sources.

[0122] Furthermore, in an embodiment, the flexible substrate 30 may be configured to support a plurality of first light generating devices 110. In particular, in an embodiment, the flexible substrate 30 may include a flexible printed circuit board (PCB).

[0123] In an embodiment, the first light responsive material 1040 may include a first liquid crystal elastomer 1041. In particular, in an embodiment, the first light responsive material 1040 may include one or more of (a) polycarbonate, polymethyl methacrylate (PMMA), glass, (b) a liquid crystal elastomer, and optionally (c) a hydrogel. Furthermore, in an embodiment, the first light responsive material 1040 may be responsive to radiation having a second wavelength λ2, such that the first light responsive material 1040 may at least temporarily expand or contract under the radiation having the second wavelength λ2. Furthermore, in an embodiment, the first light responsive material 1040 may be arranged in contact with the flexible substrate 30, such that expansion or contraction of the first light responsive material 1040 may cause a conformational change of the flexible substrate 30. Reference numeral 1100 may refer to an arrangement of the flexible substrate 30 with a plurality of first light generating devices 110 and first (and / or second) light responsive materials 1040 (and / or 2040).

[0124] In particular, in embodiments, the first light responsive material 1040 may be configured to be in light receiving relationship with the second light generating device 120. Furthermore, in embodiments, the second device light 121 may have a power selected from 35 mW / cm 2 -40 mW / cm 2 In an embodiment, the second light generating device 120 may include a solid-state light source.

[0125] Furthermore, in an embodiment, the light generating system 1000 may be configured to generate a system light 1001. Furthermore, in an embodiment, the system light 1001 may include at least a portion of the first device light 111. Furthermore, in an embodiment, the system light may have a system light optical axis Os. Furthermore, in an embodiment, the second device light may have a second optical axis O2. Furthermore, in an embodiment, the system optical axis Os and the second optical axis O2 may have a first mutual angle α1. In particular, in an embodiment, α1 may be selected from the range of 145°-225°.

[0126] In an embodiment, the control system 300 may be configured to control one or more of a beam shape and a beam direction of the beam of the system light 1001 by controlling the second light generating device 120 .

[0127] Furthermore, in embodiments, the first device light 111 may not provide stimulation to the first light responsive material 1040. Additionally or alternatively, one or more solid state light sources may include a cross-sectional area of ​​≤ 1 mm2 LED die.

[0128] Furthermore, in an embodiment, the light generating system 1000 may provide a first device light 111. In particular, the first device light 111 may have a first spectral power distribution (see Figure 1C ), the first spectral power distribution does not have an intensity at the second wavelength λ2, i.e., is less than 0.1% of its spectral power.

[0129] In an embodiment, the flexible substrate 30 depending on the second device light 121 may include at least a first conformation (see Figure 1A , (I)), wherein the flexible substrate 30 may have a first radius r1. In addition, the flexible substrate 30 depending on the second device light 121 may include at least a second conformation (see Figure 1A , (II) and (III)), wherein the flexible substrate 30 may have a second radius r2. In an embodiment, the first conformation in which the flexible substrate 30 may have a first radius r1 may be a planar conformation (see Figure 1A , (I)), that is, r1 may be infinite. In addition, in other embodiments, the second conformation in which the flexible substrate 30 may have a second radius r2 may be particularly a curved conformation, that is, a convex conformation (see Figure 1A , (II) and Figure 2 (III)) or concave conformation (see Figure 1A , (III)). In addition, in the embodiment, r1 / r2≥1.1 or r1 / r2≤0.9.

[0130] In an embodiment, the first light responsive material 1040 may be arranged in contact with the flexible substrate 30 on the front side 31 of the flexible substrate 30 (see Figure 1B , (I) and (III)). Additionally or alternatively, in an embodiment, the first light responsive material 1040 may be arranged to contact the flexible substrate 30 on the back side 32 of the flexible substrate 30 (see Figure 1B , (II) and (IV)).

[0131] refer to Figure 1B (III) and (IV), in an embodiment, the light generating system 1000 may further include a third light generating device 130 and a second light responsive material 2040 .

[0132] In particular, in an embodiment, the second light responsive material 2040 may include a second liquid crystal elastomer 2041. Furthermore, in an embodiment, the second light responsive material 2040 may be responsive to radiation having a third wavelength λ3, such that the second light responsive material 2040 may at least temporarily expand or contract under the radiation having the third wavelength λ3. Furthermore, in an embodiment, the second light responsive material 2040 may be arranged in contact with the flexible substrate 30 or in contact with the first light responsive material 1040, such that expansion or contraction of the second light responsive material 2040 may cause a conformational change in the flexible substrate 30. In particular, in an embodiment, the first light responsive material 1040 and the second light responsive material 2040 may be arranged on opposite sides of the flexible substrate 30 (see Figure 1B , (IV)). In certain embodiments, the first light responsive material 1040 and the second light responsive material 2040 may be mixed (see Figure 1B , (III)). In addition, in an embodiment, λ2≠λ3. In addition, in an embodiment, the first light-responsive material 1040 and the second light-responsive material 2040 may have light responsiveness in different directions.

[0133] Furthermore, in embodiments, third light generating device 130 may be configured to generate third device light 131. In particular, in embodiments, third device light 131 may have a power selected from 15 mW / cm 2 -60mW / cm 2 The radiant flux in the range is selected from 30 mW / cm 2 -50 mW / cm 2 Range, such as 35mW / cm 2 -40 mW / cm 2 More specifically, in an embodiment, the third device light 131 may have a third spectral power distribution including an intensity at a third wavelength λ3 (see Figure 1C ). Furthermore, in an embodiment, the second light responsive material 2040 may be configured to be in a light receiving relationship with the third light generating device 130 .

[0134] Furthermore, in an embodiment, the control system 300 may be configured to control one or more of a beam shape and a beam direction of the beam of the system light 1001 by controlling the second light generating device 120 and the third light generating device 130 .

[0135] In an embodiment, the first device light 111 may not provide a stimulus to the second photo-responsive material 2040 .

[0136] refer to Figure 1CIn an embodiment, the second light generating device 120 may be configured to generate a second device light 121 having a second wavelength λ2. Reference symbol R2 may refer to the response curve of the first light responsive material. Note that there is no spectral overlap with the first device light 111, i.e., less than 0.1% of its spectral power is at λ2. Reference symbol R3 may refer to the response curve of the second light responsive material. Note that there is also no spectral overlap with the first device light 111, i.e., less than 0.1% of its spectral power is at λ3.

[0137] Figure 2 Some embodiments of the light generating system 1000 are schematically depicted. In particular, in an embodiment, the light generating system 1000 may include an optical component 400. More particularly, in an embodiment, the optical component 400 may be arranged downstream of the plurality of first light generating devices 110. Furthermore, in an embodiment, the optical component 400 may be selected from a lens, a reflector, a collimator, and a light guide.

[0138] In an embodiment, at least one of the plurality of first light generating devices 110 may be configured to provide a first device light 111 having a first optical axis Od1. Furthermore, in an embodiment, the optical assembly 400 may have an optical assembly optical axis Oc1. Furthermore, in an embodiment, the control system 300 may be configured to control one or more of the following items by controlling the second light generating device 120: a second mutual angle α2 between the first optical axis Od1 and the optical assembly optical axis Oc1, and a first distance d1 between the first optical axis Od1 and the optical assembly optical axis Oc1.

[0139] In other embodiments, one end of the flexible substrate 30 may be fixed (see Figure 2 (I) and (II)). For example, a fixing element 470 can be arranged on one side. This can have the effect that stretching can be performed substantially at least in a direction away from the fixing element.

[0140] Additionally or alternatively, the optical assembly 400 may be configured to change one or more of the shape and size of the beam of system light 1001 (see Figure 2 (II) and (III)).

[0141] Figure 3 An embodiment of a luminaire 22 comprising a light generating system 1000 as described above is schematically depicted. Reference numeral 301 indicates a user interface which may be functionally coupled with a control system 300 comprised by the light generating system 1000 or functionally coupled to the light generating system 1000. Figure 3Also schematically depicted is an embodiment of a lamp 1 comprising a light generating system 1000. Reference numeral 3 indicates a projector device or a projector system, which can be used for projecting an image, such as on a wall, which can also comprise the light generating system 1000. Thus, Figure 3 Schematically depicted is an embodiment of a lighting device 1200, which is selected from the group of: a lamp 1, a luminaire 2, a projector device 3, a disinfection device, a photochemical reactor, and an optical wireless communication device, which comprises a light generating system 1000 as described herein. In an embodiment, such a lighting device may be a lamp 1, a luminaire 2, a projector device 3, a disinfection device, or an optical wireless communication device. Lighting device light escaping from the lighting device 1200 is indicated with reference numeral 1201. The lighting device light 1201 may essentially consist of the system light 1001, and thus in a particular embodiment may be the system light 1001. Reference numeral 1300 indicates a space, such as a room, wherein reference numeral 1307 corresponds to a wall of the room, reference numeral 1305 corresponds to a floor, and reference numeral 1310 corresponds to a ceiling.

[0142] The term "plurality" means two or more.

[0143] Those skilled in the art will understand the terms "substantially" or "essentially" and similar terms herein. The terms "substantially" or "essentially" may also include embodiments with "completely", "completely", "all", etc. Therefore, in embodiments, the adjectives substantially or substantially may also be removed. Where applicable, the term "substantially" or the term "essentially" may also relate to 90% or higher, such as 95% or higher, in particular 99% or higher, even more in particular 99.5% or higher, including 100%.

[0144] The term "comprising" also includes embodiments, wherein the term "comprising" means "consisting of.

[0145] The term "and / or" specifically refers to one or more items mentioned before and after "and / or". For example, the phrase "item 1 and / or item 2" and similar phrases may refer to one or more of item 1 and item 2. The term "comprising" may mean "consisting of" in one embodiment, but may also mean "including at least the defined categories and optionally one or more other categories" in another embodiment.

[0146] Furthermore, the terms first, second, third, etc. in the specification and claims are used to distinguish similar elements and not necessarily to describe a sequential or chronological order. It should be understood that the terms so used are interchangeable under appropriate circumstances, and that the embodiments of the invention described herein are capable of operating in other sequences than those described or illustrated herein.

[0147] For example, this document may describe a device, apparatus, or system during operation. It will be clear to those skilled in the art that the present invention is not limited to operating methods, or devices, apparatus, or systems in operation.

[0148] It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims.

[0149] In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.

[0150] The use of the verb "comprise" and its conjugations does not exclude the presence of elements or steps not stated in a claim. Unless the context clearly requires otherwise, throughout the specification and claims, the words "comprises," "comprising," etc. should be interpreted as inclusive, rather than exclusive or exhaustive; that is, in the sense of "including but not limited to."

[0151] The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

[0152] The invention may be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In a device claim, an apparatus claim or a system claim enumerating several means, several of these means may be implemented by the same item of hardware. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. In a further aspect, the invention (therefore) provides a software product which, when run on a computer, is capable of implementing (one or more embodiments of) the method described herein.

[0153] The present invention also provides a control system that can control a device, apparatus or system, or can perform the method or process described herein. In addition, the present invention also provides a computer program product that, when running on a computer functionally coupled to or included in a device, apparatus or system, controls one or more controllable elements of such a device, apparatus or system.

[0154] The present invention is also applicable to a device, apparatus or system comprising one or more of the features described in the specification and / or shown in the drawings. The present invention also relates to a method or process comprising one or more of the features described in the specification and / or shown in the drawings.

[0155] The various aspects discussed in this patent can be combined to provide additional advantages. In addition, those skilled in the art will appreciate that the embodiments can be combined, and more than two embodiments can also be combined. In addition, some of the features can form the basis of one or more branch applications.

Claims

1. A lighting device (1200), comprising a light generating system (1000); The light generating system (1000) comprises a plurality of first light generating devices (110), a flexible substrate (30), a first light responsive material (1040), a second light generating device (120), and a control system (300); wherein: The plurality of first light generating devices (110) include one or more solid-state light sources; wherein the plurality of first light generating devices (110) are configured to generate first device light (111); The flexible substrate (30) is configured to support the plurality of first light generating devices (110); The first light-responsive material (1040) comprises a first liquid crystal elastomer (1041); wherein the first light-responsive material (1040) responds to radiation having a second wavelength (λ2), such that the first light-responsive material (1040) at least temporarily expands or contracts under the radiation having the second wavelength (λ2); wherein the first light-responsive material (1040) is arranged to contact the flexible substrate (30), such that the expansion or contraction of the first light-responsive material (1040) causes a conformational change of the flexible substrate (30); The second light generating device (120) is configured to generate a second device light (121), the second device light having a second spectral power distribution, the second spectral power distribution including an intensity at the second wavelength (λ2); wherein the first light responsive material (1040) is configured to be in a light receiving relationship with the second light generating device (120); The light generating system (1000) is configured to generate system light (1001), the system light comprising at least a portion of the first device light (111); The control system (300) is configured to control one or more of a beam shape and a beam direction of a beam (1002) of system light (1001) by controlling the second light generating device (120); and wherein: The lighting device (1200) is selected from the group consisting of a lamp (1), an illuminator (2), a projector device (3), a disinfection device, a photochemical reactor, and an optical wireless communication device.

2. The lighting device (1200) according to claim 1, wherein the first device light (111) has a first spectral power distribution, the first spectral power distribution having no intensity at the second wavelength (λ2).

3. An illumination device (1200) according to any one of the preceding claims, wherein the system light (1001) has a system light optical axis (Os), wherein the second device light (121) has a second optical axis (O2), wherein the system optical axis (Os) and the second optical axis (O2) have a first mutual angle (α1), and the first mutual angle is selected from the range of 145° to 225°.

4. The lighting device (1200) according to any one of the preceding claims, wherein the second light generating device (120) is configured to generate a light having a power selected from 35 mW / cm 2 Up to 40mW / cm 2 The second device has a range of radiant flux light (121).

5. An illumination device (1200) according to any one of the preceding claims, wherein the second light generating device (120) comprises a solid-state light source; wherein the plurality of first light generating devices (110) are configured to generate the first device light (111) having an intensity at one or more wavelengths in the visible wavelength range.

6. The lighting device (1200) according to any one of the preceding claims, wherein the flexible substrate (30) comprises a flexible printed circuit board (PCB).

7. The lighting device (1200) according to any of the preceding claims, wherein the plurality of first light generating devices (110) are at least partially embedded in the first light responsive material (1040).

8. The lighting device (1200) according to any one of the preceding claims, wherein the first photoresponsive material (1040) comprises: (i) one or more of polycarbonate, polymethyl methacrylate and glass, (ii) liquid crystal elastomer, and (iii) hydrogel.

9. The lighting device (1200) according to any one of the preceding claims, wherein the plurality of first light generating devices (110) are configured in an array of solid state light sources.

10. An illumination device (1200) according to any one of the preceding claims, wherein the flexible substrate (30) depending on the second device light (121) comprises at least a first conformation and a second conformation, wherein in the first conformation the flexible substrate (30) has a first radius (r1), and in the second conformation the flexible substrate (30) has a second radius (r2), wherein r1 / r2≥1.1 or r1 / r2≤0.

9.

11. The lighting device (1200) according to any of the preceding claims, further comprising an optical assembly (400) arranged downstream of the plurality of first light generating devices (110).

12. The lighting device (1200) according to claim 11, wherein at least one of the plurality of first light generating devices (110) is configured to provide the first device light (111) having a first optical axis (Od1), wherein the optical component (400) has an optical component optical axis (Oc1), wherein the control system (300) is configured to control one or more of the following items by controlling the second light generating device (120): (i) a second mutual angle (α2) between the first optical axis (Od1) and the optical component optical axis (Oc1), and (ii) a first distance (d1) between the first optical axis (Od1) and the optical component optical axis (Oc1).

13. The lighting device according to any of the preceding claims 11-12, wherein the optical component (400) is selected from the group consisting of a lens, a reflector, a collimator and a light guide.

14. The lighting device (1200) according to any one of the preceding claims, further comprising a third light generating device (130) and a second light responsive material (2040); The second light-responsive material (2040) comprises a second liquid crystal elastomer (2041); wherein the second light-responsive material (2040) responds to radiation having a third wavelength (λ3), such that the second light-responsive material (2040) at least temporarily expands or contracts under the radiation having the third wavelength (λ3); wherein the second light-responsive material (2040) is arranged to contact the flexible substrate (30) or to contact the first light-responsive material (1040), such that the expansion or contraction of the second light-responsive material (2040) causes a conformational change of the flexible substrate (30); wherein λ2≠λ3; The first light-responsive material (1040) and the second light-responsive material (2040) have light responsiveness in different directions; The third light generating device (130) is configured to generate a third device light (131), the third device light having a third spectral power distribution, the third spectral power distribution including an intensity at the third wavelength (3); wherein the second light responsive material (2040) is configured to be in a light receiving relationship with the third light generating device (130); and The control system (300) is configured to control one or more of a beam shape and a beam direction of a beam of system light (1001) by controlling the second light generating device (120) and the third light generating device (130).

15. The lighting device (1200) according to any one of claims 9-14, wherein the solid-state light source comprises micro-LEDs.

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