Lighting device

Abstract

This disclosure provides an illumination device. The illumination device includes a substrate and a light-emitting device disposed on the substrate; the illumination device further includes a first light source, a first resonant cavity sensor, and a brightness adjustment unit; wherein, the first light source is configured to generate first polarized light having a first preset wavelength; the first resonant cavity sensor is configured to generate a first resonant wave based on the received first polarized light and ambient light; the brightness adjustment unit is configured to adjust the brightness of the light-emitting device based at least on the wavelength of the sensed first resonant wave.

Description

Technical Field

[0001] This disclosure belongs to the field of lighting technology, and specifically relates to a lighting device. Background Technology

[0002] In recent years, OLED (Organic Light-Emitting Diode) technology, as an emerging display technology, has been widely used in screen displays for mobile phones, computers, and other devices. Simultaneously, OLED technology also shows promising development prospects in the lighting field. Compared with traditional lighting products, OLED products have advantages such as low power consumption, long lifespan, thin and light design, no need for heat sinks, and flexibility, making them one of the most promising next-generation lighting products. With the further maturation of big data and cloud computing technologies, it will become possible to statistically analyze information such as people's lighting behavior and the energy consumption of light. This will provide more optimized control and decision-making solutions for personalized lighting, taking into account economy, flexibility, reliability, and safety. Smart lighting products integrating intelligence, humanization, and personalization will continue to emerge. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art and to provide a lighting device.

[0004] This disclosure provides a lighting device, which includes a substrate and a light-emitting device disposed on the substrate; wherein the lighting device further includes:

[0005] The first light source is configured to generate first polarized light having a first preset wavelength;

[0006] The first resonant cavity sensor is configured to generate a first resonant wave based on the received first polarized light and ambient light.

[0007] The brightness adjustment unit is configured to adjust the luminous brightness of the light-emitting device based at least on the wavelength of the sensed first resonant wave.

[0008] The brightness adjustment unit includes a first photodetector and a first signal processing unit;

[0009] The first photodetector is configured to generate a corresponding first electrical signal based on the wavelength of the sensed first resonant wave;

[0010] The first signal processing unit is configured to generate a corresponding first brightness control signal based on the received first electrical signal, and adjust the luminous brightness of the light-emitting device according to the first brightness control signal.

[0011] It also includes a first optical fiber; the first resonant cavity sensor is coupled to the first optical fiber, and the two ends of the first optical fiber are respectively connected to the first light source and the brightness adjustment unit.

[0012] The first optical fiber includes a first optical fiber taper, and a first optical fiber segment and a second optical fiber segment connected to both ends of the first optical fiber taper.

[0013] The first resonant cavity sensor is fixed to the first fiber taper and the two are coupled; the first light source is connected to the first fiber segment, and the brightness adjustment unit is connected to the second fiber segment.

[0014] The lighting device is divided into a light-emitting area and a non-light-emitting area surrounding the light-emitting area;

[0015] The first resonant cavity sensor is located in the light-emitting area and covers the center of the light-emitting area.

[0016] The first optical fiber passes through the center of the luminescent area and surrounds the non-luminescent area.

[0017] The first optical fiber segment and the second optical fiber segment are symmetrically arranged with a straight line passing through the center of the light-emitting area as the axis of symmetry.

[0018] An interlayer dielectric layer is disposed between the first optical fiber and the first resonant cavity sensor and the light-emitting device.

[0019] This also includes:

[0020] The second resonant cavity sensor is configured to generate a second resonant wave based on the received first polarized light and the operating temperature of the light-emitting device;

[0021] The brightness adjustment unit is further configured to adjust the luminous brightness of the light-emitting device according to the wavelength of the sensed second resonant wave and the wavelength of the first resonant wave.

[0022] The brightness adjustment unit includes a second photodetector and a second signal processing unit.

[0023] The second photodetector is configured to generate a corresponding second electrical signal based on the wavelength of the sensed first resonant wave and the wavelength of the second resonant wave.

[0024] The second signal processing unit is configured to generate a corresponding second brightness control signal based on the received second electrical signal, and to adjust the luminous brightness of the light-emitting device using the second brightness control signal.

[0025] It also includes a first optical fiber; the first resonant cavity sensor and the second resonant cavity sensor are respectively coupled to the first optical fiber, and the two ends of the first optical fiber are respectively connected to the first light source and the brightness adjustment unit.

[0026] The first optical fiber includes a first optical fiber taper and a second optical fiber taper, a first optical fiber segment connected to the end of the first optical fiber taper away from the second optical fiber taper, a second optical fiber segment connected to the end of the second optical fiber taper away from the first optical fiber taper, and a third optical fiber segment connected between the first optical fiber taper and the second optical fiber taper.

[0027] The first resonant cavity sensor is fixed to the first fiber taper and the two are coupled; the second resonant cavity sensor is fixed to the second fiber taper and the two are coupled; the first light source is connected to the first fiber segment, and the brightness adjustment unit is connected to the second fiber segment.

[0028] The lighting device is divided into a light-emitting area and a non-light-emitting area surrounding the light-emitting area;

[0029] Both the first resonant cavity sensor and the second resonant cavity sensor are located in the light-emitting area, and one of them covers the center of the light-emitting area.

[0030] The first optical fiber is arranged symmetrically around the center of the light-emitting area, with a straight line passing through the center of the light-emitting area as the axis of symmetry.

[0031] The third optical fiber segment is bent to divide it into a first connecting portion, a second connecting portion, and a bent portion connecting the first connecting portion and the second connecting portion; the first optical fiber segment is connected to the first connecting portion via a first optical fiber taper; the second optical fiber segment is connected to the second connecting portion via a second optical fiber taper.

[0032] The first connecting part and the second connecting part are fixed together by a first fixing part;

[0033] The first optical fiber segment and the second optical fiber segment are fixed together by a second fixing part.

[0034] The light-emitting device includes a first electrode, a light-emitting layer, and a second electrode arranged sequentially along a direction away from the substrate; the first resonant cavity sensor and the second resonant cavity sensor are both located on the side of the first electrode closer to the substrate.

[0035] Wherein, the first resonant cavity sensor and / or the second resonant cavity sensor are whispering-gallery mode resonant cavity sensors.

[0036] The first light source includes a laser and a polarization controller;

[0037] The laser is configured to generate a laser with a first preset wavelength;

[0038] The polarization controller is configured to control the polarization state of the laser of the first preset wavelength to generate the first polarized light. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of a lighting device according to the first example of this disclosure;

[0040] Figure 2 A schematic diagram of the structure of the first light source of the lighting device, which is a first example of the present disclosure;

[0041] Figure 3 A schematic diagram of the brightness adjustment unit of the lighting device according to the first example of this disclosure;

[0042] Figure 4 for Figure 1 A magnified view of a portion of the LAO region;

[0043] Figure 5 This is a cross-sectional schematic diagram of a portion of the lighting device according to the first example of this disclosure;

[0044] Figure 6 This is a schematic diagram of the structure of the lighting device of the second example of this disclosure;

[0045] Figure 7 This is a schematic diagram of the structure of the lighting device of the third example of this disclosure;

[0046] Figure 8 This is a schematic diagram of the structure of the brightness adjustment unit of the lighting device in the third example of this disclosure;

[0047] Figure 9 for Figure 7 A magnified view of a portion of the LAO region;

[0048] Figure 10 This is a cross-sectional schematic diagram of a portion of the lighting device of the third example of this disclosure. Detailed Implementation

[0049] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0050] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0051] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an,” “a,” or “the,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “including,” “comprising,” or “containing,” and similar terms mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. The terms “connected,” “linked,” or similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0052] like Figure 1 As shown, this disclosure provides an illumination device, which includes a substrate 10 and a light-emitting device 20 disposed on the substrate 10. The illumination device also includes a first light source 30, a first resonant cavity sensor 41, and a brightness adjustment unit 50. The first light source 30 is configured to generate first polarized light having a first preset wavelength. The first resonant cavity sensor 41 is configured to generate a first resonant wave based on the received first polarized light and ambient light. The brightness adjustment unit 50 is configured to adjust the brightness of the light-emitting device 20 based at least on the wavelength of the sensed first resonant wave.

[0053] In this embodiment, integrating the first resonant cavity sensor 41 onto the lighting device adds the function of detecting ambient light. This allows for adjustment of the brightness of the light-emitting device 41 based on the ambient light, enhancing the intelligence level of the lighting device and expanding its application scenarios. For example, the lighting device can be combined with electronic devices to form an Internet of Things (IoT) platform, enabling more intelligent control strategies for the lighting device and achieving integrated, intelligent, and user-friendly design.

[0054] In this embodiment, the substrate 10 can be a transparent substrate, such as glass, quartz, PE (Polyethylene), etc., and is not specifically limited herein.

[0055] In the embodiments of this disclosure, the light-emitting device 20 can be an LED (Light-Emitting Diode), an OLED, an LD (Laser Diode), etc. This disclosure uses an OLED as an example for illustration, but this should not be construed as limiting the scope of this disclosure. The light-emitting device 20 can be circular, rectangular, square, triangular, etc., and is not specifically limited herein.

[0056] In this embodiment, the OLED light-emitting device includes a first electrode 21, a light-emitting layer 22, and a second electrode 23 sequentially disposed along a direction away from the substrate 10. One of the first electrode 21 and the second electrode 23 is an anode, and the other is a cathode; no specific limitation is made here. When the first electrode 21 is a cathode and the second electrode 23 is an anode, the light-emitting layer 22, between the first electrode 21 and the second electrode 23, along the direction from the first electrode 21 to the second electrode 23, may include an electron injection layer, an electron transport layer, an electroluminescent layer, a hole transport layer, and a hole injection layer stacked sequentially.

[0057] In this embodiment, the first resonant cavity sensor 41 is configured to generate a first resonant wave based on the received first polarized light and ambient light. This can be understood as the first resonant wave generated within the cavity of the first resonant cavity sensor 41 when it achieves stable resonance under the influence of ambient light. This resonant wave acting on the first polarized light is the first resonant wave. The first resonant cavity sensor 41 is used to detect ambient light. For example, the first resonant cavity sensor can be placed between the OLED light-emitting device 20 and the substrate 10. Specifically, the first resonant cavity sensor 41 can be placed on the side of the first electrode 21 closest to the substrate 10, or it can be placed on the side of the OLED light-emitting device 20 away from the substrate 10. Specifically, the first resonant cavity sensor 41 can be placed on the side of the second electrode 23 away from the substrate 10. This disclosure does not specifically limit the placement of the first resonant cavity sensor 41; any sensor capable of detecting ambient light is within the scope of protection of this disclosure.

[0058] In this embodiment, the wavelength of the first resonant wave can be the wavelength of the center of the first resonant wave crest or the wavelength corresponding to the highest point of the first resonant wave crest; no specific limitation is made here. A lookup table between the wavelength of the first resonant wave and the luminous brightness of the OLED light-emitting device 20 can be pre-stored in the brightness adjustment unit 50. The brightness adjustment unit 50 can then refer to this lookup table to adjust the luminous brightness of the OLED light-emitting device 20 according to the wavelength of the first resonant wave. Alternatively, a reference wavelength of the first resonant wave can be pre-stored in the brightness adjustment unit 50. Based on the difference between the wavelength of the first resonant wave and the reference wavelength, the brightness adjustment unit 50 determines the brightness that the OLED light-emitting device 20 should achieve, and adjusts the OLED light-emitting device 20 to achieve that brightness. The brightness adjustment unit 50 can also adjust the luminous brightness of the OLED light-emitting device 20 based on the difference between the wavelengths of the first resonant wave sensed twice, based on the current brightness of the OLED light-emitting device 20. The brightness adjustment unit 50 can adjust the luminous brightness of the OLED light-emitting device 20 according to the wavelength of the first resonant wave in various forms, and no specific limitation is made here.

[0059] like Figure 2 As shown in the present embodiment, the first light source 30 includes a laser 31 and a polarization controller 32, wherein the laser 31 is configured to generate a laser with a first preset wavelength, and the polarization controller 32 is configured to control the polarization state of the laser with the first preset wavelength to generate first polarized light.

[0060] Laser 31 can be one of a solid-state laser, a gas laser, a semiconductor laser, or a liquid laser. Solid-state lasers use a solid material as the medium; common solid-state lasers include ruby ​​lasers, neodymium-doped yttrium aluminum garnet (Nd:YAG) lasers, and mirror-doped Nd:YAG lasers. Gas lasers use a gas as the medium; these lasers are excited by discharge. Gas lasers include helium-neon lasers and carbon dioxide lasers. Semiconductor lasers use semiconductor materials as the medium. Liquid lasers, also known as dye lasers, use an organic dye solution as the medium.

[0061] The first preset wavelength can be set according to the type of laser selected and the required wavelength, for example, it can be 850nm, 1310nm and 1550nm, etc., without specific limitations.

[0062] The laser emitted by laser 31 can be randomly polarized light or linearly polarized light. Compared with randomly polarized light, linearly polarized light is more stable during transmission. Therefore, when the emitted laser is randomly polarized light, a polarization controller 32 can be set to control the polarization state of the laser with a first preset wavelength to generate first polarized light.

[0063] The polarization controller 32 can be a waveplate polarization controller or a fiber loop polarization controller. The waveplate polarization controller uses the waveplate retarding theory to change the polarization state of light, while the fiber loop polarization controller changes the polarization state of light by adding stress or temperature changes in the fiber.

[0064] The lighting device of this disclosure will now be described with specific examples, but this should not be construed as limiting the scope of this disclosure.

[0065] In the first example, such as Figure 1 As shown, the lighting device includes a substrate 10 and an OLED light-emitting device 20 disposed on the substrate 10. The lighting device also includes a first light source 30, a first resonant cavity sensor 41, and a brightness adjustment unit 50. The first light source 30 is configured to generate first polarized light having a first preset wavelength. The first resonant cavity sensor 41 is configured to generate a first resonant wave based on the received first polarized light and ambient light. The brightness adjustment unit 50 is configured to adjust the brightness of the OLED light-emitting device 20 based at least on the wavelength of the sensed first resonant wave. In this example, the OLED light-emitting device 20 is circular.

[0066] like Figure 3 As shown, in this example, the brightness adjustment unit 50 includes a first photodetector 51 and a first signal processing unit 52; the first photodetector 51 is configured to generate a corresponding first electrical signal according to the wavelength of the sensed first resonant wave; the first signal processing unit 52 is configured to generate a corresponding first brightness control signal according to the received first electrical signal, and adjust the luminous brightness of the OLED light-emitting device 20 according to the first brightness control signal.

[0067] In this example, the first signal processing unit 52 may include a processor and a memory. The processor may be a microprocessor such as an MCU (Microcontroller Unit). The memory stores computer programs and lookup tables, etc. The processor executes the computer program stored in the memory to generate a corresponding first brightness control signal according to the first electrical signal, and adjusts the brightness of the OLED light-emitting device 20 according to the first brightness control signal.

[0068] In this example, the first resonant cavity sensor 41 can be a WGM (Whispering Gallery Mode) microcavity sensor. When the ambient light intensity changes, the light wave pattern inside the microcavity changes, causing the resonant wavelength of the WGM microcavity sensor to change.

[0069] Using the Lorentz shape of the mode field energy in the transmission spectrum of the WGM microcavity sensor as the response signal, the sensing process induces mode shifts. The shift in resonant wavelength characterizes the quantitative change in the Lorentz shape of the WGM microcavity sensor. The basic sensing principle of the WGM microcavity sensor can be expressed as follows:

[0070] 2πn eff a=mλ0

[0071] Where λ0 represents the resonant wavelength, m is a constant, a represents the radius of the microcavity, and n eff The effective refractive index is a physical quantity that relates to the refractive index of the material of the microcavity itself and the refractive index of the environment where the vanishing site outside the cavity is located.

[0072] The first resonant cavity sensor 41 can be a spherical microcavity, which can be made of a photostrictive material, such as lanthanum-modified lead zirconate titanate (PbLaZrTi, PLZT). The photostrictive material can change its shape with changes in the intensity of ambient light, that is, the radius 'a' of the spherical microcavity changes, thereby causing a change in the resonant wavelength λ0. The diameter of this spherical structure can be 300–500 μm.

[0073] WGM microcavity sensors are small in size and lightweight, possessing a high Q value and a small mode volume, making them easier to integrate into lighting devices. They also exhibit strong resistance to electromagnetic interference, facilitating miniaturization and high-sensitivity designs in lighting applications. The Q value, also known as the quality factor, reflects the ratio of stored energy to dissipated energy in a device or circuit at a specific frequency; specifically, it represents the ratio of stored energy to total energy. A higher Q value indicates lower losses and higher efficiency in the device or circuit. Mode volume refers to the energy density distribution of the light field in three-dimensional space within the optical resonant cavity.

[0074] like Figure 1 As shown, in this example, the lighting device also includes a first optical fiber 60; the first resonant cavity sensor 41 is coupled to the first optical fiber 60, and the two ends of the first optical fiber 60 are respectively connected to the first light source 30 and the brightness adjustment unit 50.

[0075] In this example, the first light source 30 generates first polarized light, which is transmitted in the first optical fiber 60. The first resonant cavity sensor 41 is coupled to the first optical fiber 60, and the first resonant cavity sensor 41 couples its own resonant wave to the first polarized light in the first optical fiber 60, thereby generating a first resonant wave in the first polarized light. The first resonant wave is then transmitted to the brightness adjustment unit 50, so that the brightness adjustment unit 50 adjusts the luminous brightness of the OLED light-emitting device 20 according to the wavelength of the first resonant wave. The material of the first optical fiber 60 can be quartz, plastic, etc., and is not specifically limited here.

[0076] In this example, the first resonant cavity sensor 41 is coupled to the first optical fiber 60. This can be achieved by using adhesive to bond the first resonant cavity sensor 41 to the first optical fiber 60, and then using an ultraviolet lamp to cure the adhesive.

[0077] like Figure 1 and Figure 4 As shown, in this example, the first optical fiber 60 includes a first optical fiber taper 63, and a first optical fiber segment 61 and a second optical fiber segment 62 connected to both ends of the first optical fiber taper 63; the first resonant cavity sensor 41 is fixed to the first optical fiber taper 63 and the two are coupled; the first light source 30 is connected to the first optical fiber segment 61, and the brightness adjustment unit 50 is connected to the second optical fiber segment 62.

[0078] In this example, the first light source 30 transmits the first polarized light it generates to the first optical fiber segment 61, and the first polarized light then reaches the first optical fiber taper 63, where it couples with the resonant wave of the first resonant cavity sensor 41 to generate a first resonant wave. Subsequently, the first resonant wave is transmitted to the brightness adjustment unit 50 through the second optical fiber segment 62.

[0079] In this example, the first fiber taper 63 can be prepared by locally thermally stretching the first optical fiber 60. Specifically, the first optical fiber 60 can be locally heated using hydrogen-oxygen or a laser, while simultaneously stretching both ends of the first optical fiber 60 using a stepper motor to obtain the first fiber taper 63. The laser used to generate the laser can be, for example, a carbon dioxide laser. The minimum diameter of the first fiber taper can be 6–12 μm.

[0080] In this example, the first resonant cavity sensor 41 can be fixed at the conical region of the first fiber optic taper 63 by dispensing adhesive, and then the adhesive can be cured using an ultraviolet lamp. In one embodiment, the first resonant cavity sensor 41 can be fixed at the position of the smallest diameter of the first fiber optic taper 63.

[0081] Fiber tapers can improve the damage threshold of incident light, collimate the beam, and improve beam quality. By setting the first fiber taper 63, the resonant wave of the first resonant cavity sensor 41 can be better coupled to the first polarized light to generate the first resonant wave, reducing optical damage and improving signal quality.

[0082] like Figure 5 As shown, in this example, the OLED light-emitting device 20 includes a first electrode 21, a light-emitting layer 22, and a second electrode 23 arranged sequentially along the direction away from the substrate; the first resonant cavity sensor 41 is located on the side of the first electrode 21 close to the substrate 10.

[0083] like Figure 1 As shown, in this example, the lighting device is divided into a light-emitting area LA and a non-light-emitting area DA surrounding the light-emitting area LA; the first resonant cavity sensor 41 is located in the light-emitting area LA and covers the center of the light-emitting area LA.

[0084] The light-emitting area LA can be the area covered by the orthogonal projection of the light-emitting layer 22 of the OLED light-emitting device 20 onto the substrate 10, and the non-light-emitting area DA can be the area other than the light-emitting area LA, with the non-light-emitting area DA surrounding the light-emitting area LA.

[0085] By placing the first resonant cavity sensor 41 in the light-emitting area LA, the light intensity of the ambient light around the light-emitting area LA can be detected, thereby allowing for precise adjustment of the luminous brightness of the OLED light-emitting device 20 based on the ambient light intensity around the light-emitting area LA.

[0086] like Figure 1 As shown, in this example, the first optical fiber 60 passes through the center of the light-emitting region LA and surrounds the non-light-emitting region DA. In one embodiment, a first fiber segment 61 of the first optical fiber 60 is located in the light-emitting region LA, and a portion of a second fiber segment 62 of the first optical fiber 60 is located in the light-emitting region LA, while another portion is located in the non-light-emitting region DA and surrounds the non-light-emitting region DA.

[0087] like Figure 5 As shown, Figure 1 The diagram shows the AA cross-section. The first fiber segment 61 of the first fiber 60 is located in the light-emitting region LA, and a portion of the second fiber segment 62 of the first fiber 60 is located in the non-light-emitting region DA.

[0088] like Figure 5 As shown, in this example, an interlayer dielectric layer 70 is provided between the first optical fiber 60 and the first resonant cavity sensor 41 and the OLED light-emitting device 20.

[0089] In this example, the material of the interlayer dielectric layer 70 can be an insulating material such as silicon oxide or silicon nitride. By setting the interlayer dielectric layer 70, a flat surface can be provided on the side of the first resonant cavity sensor 41 facing away from the substrate 10, which is beneficial to the fabrication of the OLED light-emitting device 20.

[0090] Of course, other optical transmission media can also be used in other examples. Whether the optical transmission media has already appeared or will appear in the future, as long as they can realize the optical transmission function of this disclosure, they are all within the protection scope of this disclosure.

[0091] In the second example, such as Figure 6 As shown, the lighting device includes a substrate 10 and an OLED light-emitting device 20 disposed on the substrate 10. The lighting device also includes a first light source 30, a first resonant cavity sensor 41, and a brightness adjustment unit 50. The first light source 30 is configured to generate first polarized light having a first preset wavelength. The first resonant cavity sensor 41 is configured to generate a first resonant wave based on the received first polarized light and ambient light. The brightness adjustment unit 50 is configured to adjust the brightness of the OLED light-emitting device 20 based at least on the wavelength of the sensed first resonant wave. In this example, the OLED light-emitting device 20 is circular.

[0092] like Figure 6 As shown, in this example, the lighting device also includes a first optical fiber 60; the first resonant cavity sensor 41 is coupled to the first optical fiber 60, and the two ends of the first optical fiber 60 are respectively connected to the first light source 30 and the brightness adjustment unit 50.

[0093] like Figure 6 As shown, in this example, the first optical fiber 60 includes a first optical fiber taper 63, and a first optical fiber segment 61 and a second optical fiber segment 62 connected to both ends of the first optical fiber taper 63; the first resonant cavity sensor 41 is fixed to the first optical fiber taper 63 and the two are coupled; the first light source 30 is connected to the first optical fiber segment 61, and the brightness adjustment unit 50 is connected to the second optical fiber segment 62.

[0094] like Figure 6 As shown, in this example, the lighting device is divided into a light-emitting area LA and a non-light-emitting area DA surrounding the light-emitting area LA; the first resonant cavity sensor 41 is located in the light-emitting area LA and covers the center of the light-emitting area LA.

[0095] like Figure 6 As shown, in this example, the first optical fiber 60 passes through the center of the light-emitting region LA and surrounds the non-light-emitting region DA.

[0096] like Figure 6 As shown, in this example, compared with the first example, the first fiber segment 61 and the second fiber segment 62 are symmetrically arranged with the straight line LA1 passing through the center of the light-emitting area as the axis of symmetry.

[0097] In the third example, such as Figure 7As shown, the lighting device includes a substrate 10 and an OLED light-emitting device 20 disposed on the substrate 10. The lighting device also includes a first light source 30, a first resonant cavity sensor 41, a second resonant cavity sensor 42, and a brightness adjustment unit 50. The first light source 30 is configured to generate first polarized light with a first preset wavelength. The first resonant cavity sensor 41 is configured to generate a first resonant wave based on the received first polarized light and ambient light. The second resonant cavity sensor 42 is configured to generate a second resonant wave based on the received first polarized light and the operating temperature of the OLED light-emitting device 20. The brightness adjustment unit 50 is configured to adjust the brightness of the OLED light-emitting device 20 based at least on the wavelengths of the sensed second and first resonant waves. In this example, the OLED light-emitting device 20 is square.

[0098] It should be noted that the wavelength of the first resonant wave is different from that of the second resonant wave, and the peaks of the first and second resonant waves do not overlap, making them easy to distinguish.

[0099] In this example, the brightness adjustment unit 50 adjusts the brightness of the OLED light-emitting device 20 based on the wavelengths of the second and first resonant waves. In one scenario, the brightness adjustment unit 50 first determines the operating temperature of the OLED light-emitting device 20 based on the wavelength of the second resonant wave. If the operating temperature of the OLED light-emitting device 20 does not exceed the operating temperature threshold, it then adjusts the brightness of the OLED light-emitting device 20 based on the wavelength of the first resonant wave. In another scenario, the brightness adjustment unit 50 first adjusts the brightness of the OLED light-emitting device 20 based on the wavelength of the first resonant wave, then determines the operating temperature of the OLED light-emitting device 20 based on the newly sensed wavelength of the second resonant wave. If the operating temperature of the OLED light-emitting device 20 does not exceed the operating temperature threshold, it stops adjusting the brightness; if the operating temperature of the OLED light-emitting device 20 exceeds the operating temperature threshold, it reduces the brightness. Other methods can also be used by the brightness adjustment unit 50 to adjust the brightness of the OLED light-emitting device 20 based on the wavelengths of the second and first resonant waves, which are not specifically limited here.

[0100] In this example, the working principle of the first resonant cavity sensor is basically the same as that of the first resonant cavity sensor in the first example, and will not be repeated here.

[0101] In this example, the second resonant cavity sensor 42 is configured to generate a second resonant wave based on the received first polarized light and the operating temperature of the OLED light-emitting device 20. This can be understood as the second resonant wave generated within the cavity of the second resonant cavity sensor 42 when it achieves stable resonance due to the operating temperature of the OLED light-emitting device 20. This resonant wave acting on the first polarized light is the second resonant wave. The second resonant cavity sensor 42 is used to detect the operating temperature of the OLED light-emitting device 20. For example, the second resonant cavity sensor 42 can be positioned between the OLED light-emitting device 20 and the substrate 10. Specifically, the second resonant cavity sensor 42 can be positioned on the side of the first electrode 21 closest to the substrate 10, or on the side of the second electrode 23 away from the substrate 10. Alternatively, the second resonant cavity sensor 42 can be positioned at the center of the orthogonal projection of the first electrode 21 or the second electrode 23 onto the substrate 10. This disclosure does not specifically limit the placement of the second resonant cavity sensor 42; any position capable of detecting the operating temperature of the OLED light-emitting device 20 is within the scope of protection of this disclosure.

[0102] In this example, the wavelength of the first resonant wave can be either the wavelength at the center of the first resonant wave crest or the wavelength corresponding to the highest point of the first resonant wave crest; no specific limitation is made here. The method by which the brightness adjustment unit 50 adjusts the luminous brightness of the OLED light-emitting device 20 according to the wavelength of the first resonant wave is basically the same as in the first example, and will not be described again here.

[0103] In this example, the wavelength of the second resonant wave can be either the wavelength at the center of the second resonant wave crest or the wavelength corresponding to the highest point of the second resonant wave crest; no specific limitation is made here. The brightness adjustment unit 50 can pre-store a lookup table between the wavelength of the second resonant wave and the operating temperature of the OLED light-emitting device 20. The brightness adjustment unit 50 can then refer to this lookup table to determine the operating temperature of the OLED light-emitting device 20 based on the wavelength of the second resonant wave. If the operating temperature of the OLED light-emitting device 20 is higher than the operating temperature threshold, the brightness of the OLED light-emitting device 20 can be reduced; if the operating temperature of the OLED light-emitting device 20 is lower than the temperature threshold, the brightness of the OLED light-emitting device 20 can be increased. The brightness adjustment unit 50 can also determine the change in the operating temperature of the OLED light-emitting device 20 based on the difference between two sensed wavelengths of the second resonant wave, and thus determine whether the current operating temperature of the OLED light-emitting device 20 exceeds the operating temperature threshold. The brightness adjustment unit 50 can determine the operating temperature of the OLED light-emitting device 20 based on the wavelength of the second resonant wave in various ways; no specific limitation is made here.

[0104] In this example, both the first resonant cavity sensor 41 and the second resonant cavity sensor 42 are integrated into the lighting device. This allows for the addition of ambient light detection functionality to the lighting device, while simultaneously enabling the detection of the operating temperature of the OLED light-emitting device. This allows for the adjustment of the OLED light-emitting device's brightness based on the ambient light intensity, while preventing over-adjustment and damage to the OLED light-emitting device. Furthermore, this enhances the intelligence level of the lighting device and expands its application scenarios.

[0105] like Figure 8 As shown, in this example, the brightness adjustment unit 50 includes a second photodetector 53 and a second signal processing unit 54; the second photodetector 53 is configured to generate a corresponding second electrical signal based on the wavelength of the sensed first resonant wave and the wavelength of the second resonant wave; the second signal processing unit is configured to generate a corresponding second brightness control signal based on the received second electrical signal, and adjust the luminous brightness of the OLED light-emitting device 20 using the second brightness control signal.

[0106] In this example, the second photodetector 53 generates a second electrical signal based on the wavelengths of the first and second resonant waves, and the second signal processing unit 54 generates a corresponding second brightness control signal based on the first electrical signal. In other examples, the second photodetector 53 can generate its own second electrical signals based on the wavelengths of the first and second resonant waves respectively, and the second signal processing unit 54 can generate one or two corresponding second brightness control signals based on the two second electrical signals. The number of the first electrical signal and the first brightness control signal can be set according to the operating mode of the second photodetector 53 and the second signal processing unit 54, and is not specifically limited here.

[0107] In this example, the second signal processing unit may include a processor and a memory. The processor may be a microprocessor such as an MCU. The memory stores computer programs and lookup tables and other information. The processor executes the computer programs stored in the memory and accesses the lookup tables and other information to generate a corresponding second brightness control signal based on the second electrical signal, and adjusts the luminous brightness of the OLED light-emitting device 20 according to the second brightness control signal.

[0108] In this example, the first resonant cavity sensor 41 can be a WGM microcavity sensor. When the ambient light intensity changes, the light wave pattern within the microcavity changes, causing a change in the resonant wavelength of the WGM microcavity sensor. The second resonant cavity sensor 42 can also be a WGM microcavity sensor. When the ambient temperature changes, the light wave pattern within the microcavity changes, causing a change in the resonant wavelength of the WGM microcavity sensor.

[0109] Using the Lorentz shape of the mode field energy in the transmission spectrum of the WGM microcavity sensor as the response signal, the sensing process induces mode shifts. The shift in resonant wavelength characterizes the quantitative change in the Lorentz shape of the WGM microcavity sensor. The basic sensing principle of the WGM microcavity sensor can be expressed as follows:

[0110] 2πn eff a=mλ0

[0111] Where λ0 represents the resonant wavelength, m is a constant, a represents the radius of the microcavity, and n eff The effective refractive index is a physical quantity that relates to the refractive index of the material of the microcavity itself and the refractive index of the environment where the vanishing site outside the cavity is located.

[0112] The first resonant cavity sensor 41 can be a spherical structure. This spherical microcavity can be made of a photorefractive material, such as ferroelectric crystals, silicon-bismuth group nonferroelectric oxides, organic polymers, and semiconductor materials (e.g., InP, CdTe). The refractive index of the photorefractive material changes with the intensity of ambient light, that is, the refractive index n of the spherical microcavity. eff The resonant wavelength λ0 changes with the intensity of ambient light.

[0113] The second resonant cavity sensor 42 can be a spherical structure, which may include a first structure and a second structure. The second structure encloses the first structure, with a gap between them. The materials of the first and second structures have different sensitivities to temperature; that is, under the same temperature change, the first and second structures deform to different degrees. For example, the first structure uses a material with high temperature sensitivity, such as PMMA (Acrylic), while the second structure uses a material with low temperature sensitivity, such as quartz glass. The gap between the first and second structures is filled (preferably completely filled) with a first fluid, the refractive index of which changes with its volume. During sensing using the second resonant cavity sensor, the first and second structures deform to different degrees, stretching or compressing the first fluid, causing a change in its volume, and consequently, changing the refractive index n of the first fluid. eff The resonant wavelength λ0 changes as the fluid changes. The first fluid can be a transparent gel.

[0114] The diameter of the spherical structure of the first resonant cavity sensor 41 and the second resonant cavity sensor 42 can be 300 to 500 μm. The size of the spherical structure of the first resonant cavity sensor 41 and the second resonant cavity sensor 42 can be the same or different, and no specific limitation is made here.

[0115] In other examples, the first resonant cavity sensor 41 and the second resonant cavity sensor 42 may be either a WGM microcavity sensor or an FP-type microcavity sensor, or other types of resonant cavity sensors.

[0116] like Figure 7 As shown, in this example, the lighting device also includes a first optical fiber 60; a first resonant cavity sensor 41 and a second resonant cavity sensor 42 are respectively coupled to the first optical fiber 60, and the two ends of the first optical fiber 60 are respectively connected to the first light source 30 and the brightness adjustment unit 50.

[0117] In this example, the first light source 30 generates first polarized light, which propagates in the first optical fiber 60. A first resonant cavity sensor 41 is coupled to the first optical fiber 60, and the first resonant cavity sensor 41 couples its own resonant wave to the first polarized light in the first optical fiber 60, thereby generating a first resonant wave in the first polarized light. After passing through the first resonant cavity sensor 41, the first polarized light continues to propagate forward. A second resonant cavity sensor 42 is coupled to the first optical fiber 60, and the second resonant cavity sensor 42 couples its own resonant wave to the first polarized light in the first optical fiber 60, thereby generating a second resonant wave in the first polarized light. The first polarized light transmits the first and second resonant waves to the brightness adjustment unit 50, so that the brightness adjustment unit 50 adjusts the luminous brightness of the OLED light-emitting device 20 according to the wavelengths of the second and first resonant waves. The material of the first optical fiber 60 can be quartz, plastic, etc., and is not specifically limited here.

[0118] In this example, the first resonant cavity sensor 41 and the second resonant cavity sensor 42 are respectively coupled to the first optical fiber 60. This can be achieved by using adhesive to bond the first resonant cavity sensor 41 and the second resonant cavity sensor 42 to the first optical fiber 60, and then using an ultraviolet lamp to cure the adhesive.

[0119] like Figure 7 and Figure 9 As shown, in this example, the first optical fiber 60 includes a first optical fiber taper 63 and a second optical fiber taper 62, a first optical fiber segment 61 connected to the end of the first optical fiber taper 63 away from the second optical fiber taper 65, a second optical fiber segment 62 connected to the end of the second optical fiber taper 65 away from the first optical fiber taper 63, and a third optical fiber segment 64 connected between the first optical fiber taper 63 and the second optical fiber taper 65; the first resonant cavity sensor 41 is fixed to the first optical fiber taper 63 and the two are coupled; the second resonant cavity sensor 42 is fixed to the second optical fiber taper 65 and the two are coupled; the first light source 30 is connected to the first optical fiber segment 61, and the brightness adjustment unit 50 is connected to the second optical fiber segment 62.

[0120] In this example, the first light source 30 transmits the first polarized light it generates to the first fiber segment 61. The first polarized light then reaches the first fiber taper 63 and couples with the resonant wave of the first resonant cavity sensor 41 to generate a first resonant wave. Subsequently, the first polarized light is transmitted in the third fiber segment 64 and reaches the second fiber taper 65, where it couples with the resonant wave of the second resonant cavity sensor 42 to generate a second resonant wave. The first polarized light then transmits the first and second resonant waves to the brightness adjustment unit 50.

[0121] In this example, the method for preparing the first fiber taper 63 and the second fiber taper 65 is the same as in the first example, and will not be repeated here.

[0122] The first resonant cavity sensor 41 can be fixed to the conical region of the first fiber optic taper 63 by dispensing adhesive, and then cured using an ultraviolet lamp; the second resonant cavity sensor 42 can be fixed to the conical region of the second fiber optic taper 65 by dispensing adhesive, and then cured using an ultraviolet lamp. In one embodiment, the first resonant cavity sensor 41 can be fixed at the position with the smallest diameter of the first fiber optic taper 63, and the second resonant cavity sensor 42 can be fixed at the position with the smallest diameter of the second fiber optic taper 65. The minimum diameter of the first fiber optic taper 63 and the second fiber optic taper 65 can be 6–12 μm.

[0123] like Figure 10 As shown, in this example, the OLED light-emitting device 20 includes a first electrode 21, a light-emitting layer 22, and a second electrode 23 arranged sequentially along the direction away from the substrate 10; the first resonant cavity sensor 41 and the second resonant cavity sensor 42 are both located on the side of the first electrode 21 close to the substrate 10.

[0124] like Figure 7 As shown, in this example, the lighting device is divided into a light-emitting area LA and a non-light-emitting area DA surrounding the light-emitting area LA; the first resonant cavity sensor 41 and the second resonant cavity sensor 42 are both located in the light-emitting area LA, and one of them covers the center of the light-emitting area LA.

[0125] The light-emitting area LA can be the area covered by the orthogonal projection of the light-emitting layer 22 of the OLED light-emitting device 20 onto the substrate 10, and the non-light-emitting area DA can be the area other than the light-emitting area LA, with the non-light-emitting area DA surrounding the light-emitting area LA.

[0126] In one embodiment, placing the second resonant cavity sensor in the light-emitting area allows for more accurate detection of the operating temperature of the OLED light-emitting device. Placing the second resonant cavity sensor in the center of the light-emitting area further improves the accuracy of the detection of the operating temperature of the OLED light-emitting device, thereby enabling more precise adjustment of the luminous brightness of the OLED light-emitting device.

[0127] like Figure 7As shown, in this example, the first optical fiber 60 is arranged symmetrically around the center of the light-emitting area LA, with the straight line passing through the center of the light-emitting area LA as the axis of symmetry.

[0128] like Figure 10 As shown, Figure 7 The schematic diagram of the BB cross section shows that the first fiber segment 61, the second fiber segment 62, and the third fiber segment 64 of the first fiber 60 are all located in the light-emitting area.

[0129] like Figure 7 and Figure 9 As shown, in this example, the third optical fiber segment 64 is bent, dividing it into a first connecting portion 641, a second connecting portion 642, and a bent portion 643 connecting the first connecting portion 641 and the second connecting portion 642. The first optical fiber segment 61 is connected to the first connecting portion 641 via a first optical fiber taper 63. The second optical fiber segment 62 is connected to the second connecting portion 642 via a second optical fiber taper 65. The first connecting portion 641 and the second connecting portion 642 are fixed together by a first fixing portion 81. The first optical fiber segment 61 and the second optical fiber segment 62 are fixed together by a second fixing portion 82.

[0130] In this example, the first fixing part 81 and the second fixing part 82 can be adhesive dispensing or other devices that can achieve a fixing effect, and no specific limitation is made here. By setting the first fixing part 81 and the second fixing part 82, the structure of the first optical fiber 60 can be made more robust, which is conducive to the firm coupling between the first resonant cavity sensor 41 and the second resonant cavity sensor 42 and the first optical fiber 60.

[0131] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A lighting device comprising a substrate and a light-emitting device disposed on the substrate, the light-emitting device comprising a first electrode, a light-emitting layer, and a second electrode sequentially disposed along a direction away from the substrate; wherein, The lighting device also includes: The first light source is configured to generate first polarized light having a first preset wavelength; A first resonant cavity sensor is configured to generate a first resonant wave based on the received first polarized light and ambient light; the first resonant cavity sensor is located on the side of the first electrode close to the substrate. The brightness adjustment unit is configured to adjust the luminous brightness of the light-emitting device at least according to the wavelength of the sensed first resonant wave; The first optical fiber is located on the side of the first electrode close to the substrate; the first resonant cavity sensor is coupled to the first optical fiber, and the two ends of the first optical fiber are respectively connected to the first light source and the brightness adjustment unit.

2. The lighting device according to claim 1, wherein, The brightness adjustment unit includes a first photodetector and a first signal processing unit; The first photodetector is configured to generate a corresponding first electrical signal based on the wavelength of the sensed first resonant wave; The first signal processing unit is configured to generate a corresponding first brightness control signal based on the received first electrical signal, and adjust the luminous brightness of the light-emitting device according to the first brightness control signal.

3. The lighting device according to claim 1, wherein, The first optical fiber includes a first fiber taper, and a first optical fiber segment and a second optical fiber segment connected to both ends of the first fiber taper; The first resonant cavity sensor is fixed to the first fiber taper and the two are coupled; the first light source is connected to the first fiber segment, and the brightness adjustment unit is connected to the second fiber segment.

4. The lighting device according to claim 3, wherein, The lighting device is divided into a light-emitting area and a non-light-emitting area surrounding the light-emitting area; The first resonant cavity sensor is located in the light-emitting area and covers the center of the light-emitting area.

5. The lighting device according to claim 4, wherein, The first optical fiber passes through the center of the luminescent area and surrounds the non-luminescent area.

6. The lighting device according to claim 5, wherein, The first fiber segment and the second fiber segment are symmetrically arranged with a straight line passing through the center of the light-emitting area as the axis of symmetry.

7. The lighting device according to claim 1, wherein, An interlayer dielectric layer is disposed between the first optical fiber and the first resonant cavity sensor and the light-emitting device.

8. The lighting device according to claim 1, wherein, Also includes: The second resonant cavity sensor is configured to generate a second resonant wave based on the received first polarized light and the operating temperature of the light-emitting device; The brightness adjustment unit is further configured to adjust the luminous brightness of the light-emitting device according to the wavelength of the sensed second resonant wave and the wavelength of the first resonant wave.

9. The lighting device according to claim 8, wherein, The brightness adjustment unit includes a second photodetector and a second signal processing unit; The second photodetector is configured to generate a corresponding second electrical signal based on the wavelength of the sensed first resonant wave and the wavelength of the second resonant wave. The second signal processing unit is configured to generate a corresponding second brightness control signal based on the received second electrical signal, and to adjust the luminous brightness of the light-emitting device using the second brightness control signal.

10. The lighting device according to claim 8, wherein, The first resonant cavity sensor and the second resonant cavity sensor are respectively coupled to the first optical fiber.

11. The lighting device according to claim 10, wherein, The first optical fiber includes a first optical fiber taper and a second optical fiber taper, a first optical fiber segment connected to the end of the first optical fiber taper away from the second optical fiber taper, a second optical fiber segment connected to the end of the second optical fiber taper away from the first optical fiber taper, and a third optical fiber segment connected between the first optical fiber taper and the second optical fiber taper. The first resonant cavity sensor is fixed to the first fiber taper and the two are coupled; the second resonant cavity sensor is fixed to the second fiber taper and the two are coupled; the first light source is connected to the first fiber segment, and the brightness adjustment unit is connected to the second fiber segment.

12. The lighting device according to claim 11, wherein, The lighting device is divided into a light-emitting area and a non-light-emitting area surrounding the light-emitting area; Both the first resonant cavity sensor and the second resonant cavity sensor are located in the light-emitting area, and one of them covers the center of the light-emitting area.

13. The lighting device according to claim 12, wherein, The first optical fiber is arranged symmetrically around the center of the light-emitting area, with a straight line passing through the center of the light-emitting area as the axis of symmetry.

14. The lighting device according to claim 13, wherein, The third optical fiber segment is bent to divide it into a first connecting part, a second connecting part, and a bent part connecting the first connecting part and the second connecting part; the first optical fiber segment is connected to the first connecting part through the first optical fiber taper; the second optical fiber segment is connected to the second connecting part through the second optical fiber taper. The first connecting part and the second connecting part are fixed together by a first fixing part; The first optical fiber segment and the second optical fiber segment are fixed together by a second fixing part.

15. The lighting device according to claim 8, wherein, The second resonant cavity sensor is located on the side of the first electrode closer to the substrate.

16. The lighting device according to claim 8, wherein, The first resonant cavity sensor and / or the second resonant cavity sensor are whispering-gallery mode resonant cavity sensors.

17. The lighting device according to claim 1, wherein, The first light source includes a laser and a polarization controller; The laser is configured to generate a laser with a first preset wavelength; The polarization controller is configured to control the polarization state of the laser of the first preset wavelength to generate the first polarized light.

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