Lighting device

Abstract

The invention provides a lighting device. The lighting device comprises a substrate base plate and a light-emitting device arranged on the substrate base plate. The lighting device further comprises a first light source, a first resonant cavity sensor and a brightness adjusting unit. Wherein the first light source is configured to generate first polarized light with a first preset wavelength; the first resonant cavity sensor is configured to generate a first resonant wave according to the received first polarized light and external environment light; the brightness adjusting unit is configured to adjust the light emitting brightness of the light emitting device at least according to the sensed wavelength of the first resonance wave.

Description

Technical Field

[0001] The present invention belongs to the field of lighting technology, and particularly relates to a lighting device. Background Art

[0002] In recent years, OLED (Organic Light-Emitting Diode) technology, as an emerging display technology, has been widely used in screen displays such as mobile phones and computers. At the same time, OLED technology also has good development prospects in the field of lighting. Compared with traditional lighting products, OLED products have the advantages of low power consumption, long life, thin and light appearance, no need for heat sinks, and bendability. It is one of the most promising lighting products of the next generation. With the further maturity of big data and cloud computing technology, it is possible to conduct statistical analysis on people's lighting behavior and the energy consumption of lighting. This will bring more optimized control and decision-making solutions for people to achieve personalized lighting on the basis of taking into account economy, flexibility, reliability, and safety. Smart lighting products that integrate intelligence, humanity, 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 provides a lighting device.

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

[0005] A first light source configured to generate a first polarized light having a first predetermined wavelength;

[0006] A first resonant cavity sensor is configured to generate a first resonant wave according to the received first polarized light and external ambient light;

[0007] The brightness adjustment unit is configured to adjust the light emitting brightness of the light emitting device at least according to the sensed wavelength of the first resonance wave.

[0008] Wherein, the brightness adjustment unit includes a first light detector and a first signal processing unit;

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

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

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

[0012] Wherein, the first optical fiber includes a first optical fiber cone, and a first optical fiber segment and a second optical fiber segment connected at two ends of the first optical fiber cone;

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

[0014] Wherein, 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] Wherein, the first optical fiber runs through the center of the light-emitting area and surrounds the non-light-emitting 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 a symmetry axis.

[0018] Wherein, an interlayer dielectric layer is arranged between the first optical fiber, the first resonant cavity sensor and the light-emitting device.

[0019] Among them, it also includes:

[0020] a second resonant cavity sensor configured to generate a second resonant wave according to 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 light emitting brightness of the light emitting device according to the sensed wavelength of the second resonance wave and the wavelength of the first resonance wave.

[0022] Wherein, the brightness adjustment unit includes a second light detector and a second signal processing unit;

[0023] The second photodetector is configured to generate a corresponding second electrical signal according to the sensed wavelength of the first resonance wave and the wavelength of the second resonance wave;

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

[0025] Wherein, 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 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 cone and a second optical fiber cone, and a first optical fiber segment connected to an end of the first optical fiber cone away from the second optical fiber cone, a second optical fiber segment connected to an end of the second optical fiber cone away from the first optical fiber cone, and a third optical fiber segment connected between the first optical fiber cone and the second optical fiber cone;

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

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

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

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

[0031] The third optical fiber segment is bent to divide the third optical fiber segment into a first connection portion, a second connection portion, and a bending portion connecting the first connection portion and the second connection portion; the first optical fiber segment is connected to the first connection portion through the first optical fiber cone; the second optical fiber segment is connected to the second connection portion through the second optical fiber cone;

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

[0033] The first optical fiber segment and the second optical fiber segment are fixed to each other via a second fixing portion.

[0034] The light emitting device comprises a first electrode, a light emitting layer and a second electrode arranged in sequence in a direction away from the substrate; the first resonant cavity sensor and the second resonant cavity sensor are both located on a side of the first electrode close to the substrate.

[0035] Wherein, the first resonant cavity sensor and / or the second resonant cavity sensor is a whispering gallery mode resonant cavity sensor.

[0036] Wherein, the first light source includes a laser and a polarization controller;

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

[0038] The polarization controller is configured to control the polarization state of the laser light of the first preset wavelength to generate the first polarized light. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a schematic structural diagram of a lighting device according to a first example of the present disclosure;

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

[0041] Figure 3 This is a structural schematic diagram of a brightness adjustment unit of a lighting device according to a first example of the present disclosure;

[0042] Figure 4 for Figure 1 A local magnified image of the middle LAO region;

[0043] Figure 5 is a schematic cross-sectional view of a partial area of ​​a lighting device according to a first example of the present disclosure;

[0044] Figure 6 is a schematic structural diagram of a lighting device according to a second example of the present disclosure;

[0045] Figure 7 is a schematic structural diagram of a lighting device according to a third example of the present disclosure;

[0046] Figure 8 This is a structural schematic diagram of a brightness adjustment unit of a lighting device according to a third example of the present disclosure;

[0047] Fig. 9 for Figure 7 A local magnified image of the middle LAO region;

[0048] Fig.10 It is a schematic cross-sectional view of a partial area of ​​a lighting device according to a third example of the present disclosure. DETAILED DESCRIPTION

[0049] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0050] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0051] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one", "one" or "the" do not indicate quantity restrictions, but indicate that there is at least one. Similar words such as "include" or "comprise" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Similar words such as "connect" or "connected" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0052] like Figure 1 As shown, the present disclosure provides a lighting device, which includes a substrate 10 and a light-emitting device 20, wherein the light-emitting device 20 is arranged 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, wherein the first light source 30 is configured to generate a first polarized light having a first preset wavelength, the first resonant cavity sensor 41 is configured to generate a first resonant wave according to the received first polarized light and external ambient light, and the brightness adjustment unit 50 is configured to adjust the light-emitting brightness of the light-emitting device 20 according to at least the wavelength of the sensed first resonant wave.

[0053] In the embodiment of the present disclosure, the first resonant cavity sensor 41 is integrated into the lighting device, and the function of detecting the external ambient light can be added to the lighting device, and then the light luminance of the light emitting device 41 can be adjusted according to the external ambient light, thereby improving the intelligence level of the lighting device and increasing the application scenarios of the lighting device. For example, the lighting device can be combined with electronic devices to form an Internet of Things platform, realize a more intelligent control strategy for the lighting device, and realize the integrated, intelligent and humanized design of the lighting device.

[0054] In the embodiment of the present disclosure, the base substrate 10 may be a transparent substrate, for example, may be made of glass, quartz, PE (Polyethylene), etc., which is not specifically limited herein.

[0055] In the embodiment of the present disclosure, the light-emitting device 20 may be an LED (Light-Emitting Diode) light-emitting device, an OLED light-emitting device, an LD (Laser Diode) light-emitting device, etc. The present disclosure uses an OLED light-emitting device as an example for description, but this does not constitute a limitation of the present disclosure. The light-emitting device 20 may be circular, rectangular, square, triangular, etc., which is not specifically limited here.

[0056] In the embodiment of the present disclosure, the OLED light-emitting device includes a first electrode 21, a light-emitting layer 22, and a second electrode 23, which are sequentially arranged in a direction away from the base substrate 10. Among them, one of the first electrode 21 and the second electrode 23 is an anode and the other is a cathode, which is not specifically limited here. In the case where the first electrode 21 is a cathode and the second electrode 23 is an anode, between the first electrode 21 and the second electrode 23, along the direction from the first electrode 21 to the second electrode 23, the light-emitting layer 22 may include an electron injection layer, an electron transport layer, an electroluminescent layer, a hole transport layer, and a hole injection layer stacked in sequence.

[0057] In the embodiment of the present disclosure, the first resonant cavity sensor 41 is configured to generate a first resonant wave according to the received first polarized light and the external ambient light. It can be understood that under the influence of the external ambient light, the cavity of the first resonant cavity sensor 41 generates a resonant wave corresponding to a stable resonance, and the resonant wave acting on the first polarized light is the first resonant wave. The first resonant cavity sensor 41 is used to detect the external ambient light. For example, the first resonant cavity sensor can be set between the OLED light-emitting device 20 and the substrate 10. Specifically, the first resonant cavity sensor 41 can be set on the side of the first electrode 21 close to the substrate 10, or the first resonant cavity sensor 41 can be set on the side of the OLED light-emitting device 20 away from the substrate 10. Specifically, the first resonant cavity sensor 41 can be set on the side of the second electrode 23 away from the substrate 10. The present disclosure does not specifically limit the setting position of the first resonant cavity sensor 41. As long as it can detect the external ambient light, it is within the protection scope of the present disclosure.

[0058] In the embodiment of the present disclosure, the wavelength of the first resonance wave may be the wavelength of the center of the peak of the first resonance wave, or the wavelength corresponding to the highest point of the peak of the first resonance wave, which is not specifically limited here. A comparison table between the wavelength of the first resonance wave and the luminous brightness of the OLED light-emitting device 20 may be pre-stored in the brightness adjustment unit 50, so that the brightness adjustment unit 50 may refer to the comparison table and adjust the luminous brightness of the OLED light-emitting device 20 according to the wavelength of the first resonance wave; the reference wavelength of the first resonance wave may also be pre-stored in the brightness adjustment unit 50, and the brightness adjustment unit 50 may determine the brightness that the OLED light-emitting device 20 should reach based on the reference brightness of the OLED light-emitting device 20 according to the difference between the wavelength of the first resonance wave and the reference wavelength, and adjust the OLED light-emitting device 20 to reach the brightness; the brightness adjustment unit 50 may also adjust the luminous brightness of the OLED light-emitting device 20 based on the current brightness of the OLED light-emitting device 20 according to the difference between the wavelengths of the first resonance wave sensed twice. There may be many forms for the brightness adjustment unit 50 to adjust the luminous brightness of the OLED light-emitting device 20 according to the wavelength of the first resonance wave, which is not specifically limited here.

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

[0060] The laser 31 can be one of a solid laser, a gas laser, a semiconductor laser and a liquid laser. A solid laser is a laser that uses a solid material as a medium. Common solid lasers include ruby ​​lasers, neodymium-doped yttrium aluminum garnet lasers and mirror-doped yttrium aluminum garnet lasers. A gas laser is a laser that uses gas as a medium. This type of laser is excited by discharge. Gas lasers include helium-neon lasers, carbon dioxide lasers, etc. A semiconductor laser is a laser that uses a semiconductor material as a medium. A liquid laser, also known as a dye laser, uses an organic dye solution as a 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, 1550nm, etc., and is not specifically limited here.

[0062] The laser light emitted by the laser 31 may 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 light is randomly polarized light, a polarization controller 32 may be further provided to control the polarization state of the laser light of the first preset wavelength to generate the first polarized light.

[0063] The polarization controller 32 can be a wave plate polarization controller or a fiber ring polarization controller. The wave plate polarization controller uses the wave plate retardation theory to change the polarization state of light, while the fiber ring polarization controller changes the polarization state of light by adding stress or temperature change in the optical fiber.

[0064] Next, the lighting device of the present disclosure is described with reference to specific examples, but this does not constitute a limitation of the present disclosure.

[0065] In the first example, 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, wherein the first light source 30 is configured to generate a first polarized light having a first preset wavelength, the first resonant cavity sensor 41 is configured to generate a first resonant wave according to the received first polarized light and external ambient light, and the brightness adjustment unit 50 is configured to adjust the light emitting brightness of the OLED light-emitting device 20 according to at least 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 light detector 51 and a first signal processing unit 52; the first light detector 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 light emitting 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 information such as a computer program and a reference table. 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 light emitting 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 may be a WGM (Whispering Gallery Mode) microcavity sensor. When the ambient light intensity changes, the light wave mode in the microcavity changes, causing the resonant wavelength of the WGM microcavity sensor to change.

[0069] The Lorentz line shape of the mode field energy of the WGM microcavity sensor in the transmission spectrum is used as the response signal. The sensing process will cause mode movement, and the movement of the resonant wavelength will characterize the quantitative change of the Lorentz line shape of the WGM microcavity sensor. The basic sensing principle of the WGM microcavity sensor can be expressed as:

[0070] 2πn eff a=mλ 0

[0071] Among them, λ 0 represents the resonant wavelength, m is a constant, a represents the radius of the microcavity, and n eff The physical quantity that is related to the refractive index of the material of the microcavity itself and the refractive index of the environment where the evanescent field outside the cavity is located is called the effective refractive index.

[0072] The first resonant cavity sensor 41 may be a spherical microcavity, which may be made of a photostrictive material. The photostrictive material may be, for example, lanthanum-modified lead zirconate titanate (PbLaZrTi, PLZT), etc. The photostrictive material may change in shape as the intensity of ambient light changes, that is, the radius a of the spherical microcavity changes, thereby causing the resonant wavelength λ 0 The diameter of the spherical structure may be 300 to 500 μm.

[0073] The WGM microcavity sensor is small in size and light in weight, with a high Q value and a small mode volume. It is easier to integrate into lighting devices and has strong anti-electromagnetic interference capabilities, which is conducive to the miniaturization and high-sensitivity design of lighting devices. The Q value is also called the quality factor. It reflects the ratio of energy storage to energy loss of a device or circuit at a specific frequency, specifically the ratio of energy storage to total energy. The higher the Q value, the smaller the loss of the device or circuit and the higher the efficiency. The mode volume refers to the energy density distribution of the light field in three-dimensional space in an optical resonant cavity.

[0074] like Figure 1 As shown, in this example, the lighting device further includes a first optical fiber 60; the first resonant cavity sensor 41 is coupled to the first optical fiber 60, and 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 a first polarized light, the first polarized light is transmitted in the first optical fiber 60, the first resonant cavity sensor 41 is coupled to the first optical fiber 60, 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, and transmitting the first resonant wave to the brightness adjustment unit 50, so that the brightness adjustment unit 50 adjusts the light emitting 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., which is not specifically limited here.

[0076] In this example, the first resonant cavity sensor 41 is coupled to the first optical fiber 60 by bonding the first resonant cavity sensor 41 to the first optical fiber 60 using glue, and then curing the glue using an ultraviolet lamp.

[0077] like Figure 1 and Figure 4 As shown, in this example, the first optical fiber 60 includes a first optical fiber cone 63, and a first optical fiber segment 61 and a second optical fiber segment 62 connected at both ends of the first optical fiber cone 63; the first resonant cavity sensor 41 is fixed to the first optical fiber cone 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 cone 63, couples with the resonant wave of the first resonant cavity sensor 41 to generate a first resonant wave, and then 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 optical fiber cone 63 can be prepared by locally thermally stretching the first optical fiber 60. Specifically, the first optical fiber 60 can be locally heated by hydrogen and oxygen gas or laser, and the two ends of the first optical fiber 60 can be stretched by a stepper motor to obtain the first optical fiber cone 63. The laser generating the laser can be, for example, a carbon dioxide laser. The minimum diameter of the first optical fiber cone can be 6 to 12 μm.

[0080] In this example, the first resonant cavity sensor 41 can be fixed at the cone region of the first optical fiber cone 63 by dispensing glue, and then the dispensing glue is cured by ultraviolet light. In one embodiment, the first resonant cavity sensor 41 can be fixed at the position where the diameter of the first optical fiber cone 63 is the smallest.

[0081] The fiber taper can increase the damage threshold of the incident light, collimate the light beam, and improve the 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, reduce light damage, and improve 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 in sequence in a direction away from the substrate; the first resonant cavity sensor 41 is located on a 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 may be the area covered by the orthographic projection of the light-emitting layer 22 of the OLED light-emitting device 20 on the base substrate 10 , and the non-light-emitting area DA may be the area other than the light-emitting area LA, and the non-light-emitting area DA surrounds the light-emitting area LA.

[0085] The first resonant cavity sensor 41 is arranged in the light emitting area LA to detect the intensity of the ambient light around the light emitting area LA, so that the light emitting brightness of the OLED light emitting device 20 can be accurately adjusted according to the intensity of the ambient light around the light emitting area LA.

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

[0087] like Figure 5 As shown, Figure 1 In the AA cross-sectional schematic diagram, the first optical fiber segment 61 of the first optical fiber 60 is located in the light-emitting area LA, and a portion of the second optical fiber segment 62 of the first optical fiber 60 is located in the non-light-emitting area DA.

[0088] like Figure 5 As shown, in this example, an interlayer dielectric layer 70 is disposed between the first optical fiber 60 , 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 may be insulating materials such as silicon oxide and silicon nitride. By providing the interlayer dielectric layer 70 , a flat surface can be provided on the side of the first resonant cavity sensor 41 away from the substrate 10 , thereby facilitating the preparation of the OLED light emitting device 20 .

[0090] Of course, in other examples, other optical transmission media may also be selected, no matter whether they are already available or are about to appear, as long as they can realize the optical transmission function of the present disclosure, they are within the protection scope of the present disclosure.

[0091] In the second example, 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, wherein the first light source 30 is configured to generate a first polarized light having a first preset wavelength, the first resonant cavity sensor 41 is configured to generate a first resonant wave according to the received first polarized light and external ambient light, and the brightness adjustment unit 50 is configured to adjust the light emitting brightness of the OLED light-emitting device 20 according to at least 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 further includes a first optical fiber 60; the first resonant cavity sensor 41 is coupled to the first optical fiber 60, and 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 cone 63, and a first optical fiber segment 61 and a second optical fiber segment 62 connected at both ends of the first optical fiber cone 63; the first resonant cavity sensor 41 is fixed to the first optical fiber cone 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 area LA and surrounds the non-light emitting area DA.

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

[0097] In the third example, 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, wherein the first light source 30 is configured to generate a first polarized light having a first preset wavelength, the first resonant cavity sensor 41 is configured to generate a first resonant wave according to the received first polarized light and the external ambient light, the second resonant cavity sensor 42 is configured to generate a second resonant wave according to the received first polarized light and the operating temperature of the OLED light-emitting device 20, and the brightness adjustment unit 50 is configured to adjust the light emitting brightness of the OLED light-emitting device 20 according to at least the wavelength of the sensed second resonant wave and the wavelength of the first resonant wave. 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 the wavelength of the second resonant wave, and there is no overlap between the peaks of the first resonant wave and the second resonant wave, so they are easy to distinguish.

[0099] In this example, the brightness adjustment unit 50 adjusts the luminance of the OLED light emitting device 20 according to the wavelength of the second resonant wave and the wavelength of the first resonant wave. In one case, it can be understood that the brightness adjustment unit 50 first determines the operating temperature of the OLED light emitting device 20 according to the wavelength of the second resonant wave, and then adjusts the luminance of the OLED light emitting device 20 according to the wavelength of the first resonant wave when the operating temperature of the OLED light emitting device 20 does not exceed the operating temperature threshold. In another case, it can also be understood that the brightness adjustment unit 50 first adjusts the luminance of the OLED light emitting device 20 according to the wavelength of the first resonant wave, and then determines the operating temperature of the OLED light emitting device 20 according to the wavelength of the second resonant wave sensed most recently, and does not adjust the luminance of the OLED light emitting device 20 when the operating temperature of the OLED light emitting device 20 does not exceed the operating temperature threshold. When the operating temperature of the OLED light emitting device 20 exceeds the operating temperature threshold, the luminance of the OLED light emitting device 20 is reduced. The method for the brightness adjustment unit 50 to adjust the luminance of the OLED light emitting device 20 according to the wavelength of the second resonant wave and the wavelength of the first resonant wave can also be in other ways, which are not specifically limited here.

[0100] In this example, the working principle of the first resonant cavity sensor is substantially the same as the working principle of the first resonant cavity sensor in the first example, and is not described in detail here.

[0101] In this example, the second resonant cavity sensor 42 is configured to generate a second resonant wave according to the received first polarized light and the operating temperature of the OLED light-emitting device 20. It can be understood that, under the influence of the operating temperature of the OLED light-emitting device 20, the cavity of the second resonant cavity sensor 42 generates a resonant wave corresponding to a stable resonance, and the 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 set between the OLED light-emitting device 20 and the substrate 10. Specifically, the second resonant cavity sensor 42 can be set on the side of the first electrode 21 close to the substrate 10, and the second resonant cavity sensor 42 can also be set on the side of the second electrode 23 away from the substrate 10. The second resonant cavity sensor 42 can be set at the center of the positive projection of the first electrode 21 or the second electrode 23 on the substrate 10. The present disclosure does not specifically limit the setting position of the second resonant cavity sensor 42. As long as it can detect the operating temperature of the OLED light-emitting device 20, it is within the protection scope of the present disclosure.

[0102] In this example, the wavelength of the first resonance wave may be the wavelength of the center of the first resonance wave peak, or the wavelength corresponding to the highest point of the first resonance wave peak, which is not specifically limited here. The method in which the brightness adjustment unit 50 adjusts the light emitting brightness of the OLED light emitting device 20 according to the wavelength of the first resonance wave is basically the same as that in the first example, and is not described in detail here.

[0103] In this example, the wavelength of the second resonance wave may be the wavelength of the center of the second resonance wave peak, or the wavelength corresponding to the highest point of the second resonance wave peak, which is not specifically limited here. A comparison table between the wavelength of the second resonance wave and the operating temperature of the OLED light-emitting device 20 may be pre-stored in the brightness adjustment unit 50, so that the brightness adjustment unit 50 may refer to the comparison table and judge the operating temperature of the OLED light-emitting device 20 according to the wavelength of the second resonance wave. When 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 may be reduced, and when 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 may be increased; the brightness adjustment unit 50 may also judge the change of the operating temperature of the OLED light-emitting device 20 according to the difference between the wavelengths of the second resonance wave sensed twice, and further judge whether the current operating temperature of the OLED light-emitting device 20 exceeds the operating temperature threshold. There may be many forms for the brightness adjustment unit 50 to judge the operating temperature of the OLED light-emitting device 20 according to the wavelength of the second resonance wave, which is not specifically limited here.

[0104] In this example, the first resonant cavity sensor 41 and the second resonant cavity sensor 42 are integrated into the lighting device, which can increase the function of detecting the external ambient light on the lighting device and realize the detection of the working temperature of the OLED light-emitting device. Therefore, while adjusting the luminous brightness of the OLED light-emitting device 20 according to the intensity of the external ambient light, it is possible to prevent the luminous brightness of the OLED light-emitting device 20 from being excessively adjusted, thereby avoiding damage to the OLED light-emitting device 20, further improving the intelligence level of the lighting device and increasing the application scenarios of the lighting device.

[0105] like Figure 8 As shown, in this example, the brightness adjustment unit 50 includes a second light detector 53 and a second signal processing unit 54; the second light detector 53 is configured to generate a corresponding second electrical signal according to the sensed wavelength of the 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 according to the received second electrical signal, and use the second brightness control signal to adjust the light emitting brightness of the OLED light emitting device 20.

[0106] In this example, the second light detector 53 generates a second electrical signal according to the wavelength of the first resonant wave and the wavelength of the second resonant wave, and the second signal processing unit 54 generates a corresponding second brightness control signal according to the first electrical signal. In other examples, the second light detector 53 can generate respective second electrical signals according to the wavelength of the first resonant wave and the wavelength of the second resonant wave, and the second signal processing unit 54 generates a corresponding one or two second brightness control signals according to the two second electrical signals. The number of the first electrical signal and the first brightness control signal can be set according to the working mode of the second light detector 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 information such as a computer program and a reference table. The processor executes the computer program stored in the memory and accesses other information such as the reference table to generate a corresponding second brightness control signal according to the second electrical signal, and adjusts the light emitting 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 may be a WGM microcavity sensor, and when the light intensity of the external environment changes, the light wave mode in the microcavity changes, causing the resonant wavelength of the WGM microcavity sensor to change. The second resonant cavity sensor 42 may be a WGM microcavity sensor, and when the temperature of the external environment changes, the light wave mode in the microcavity changes, causing the resonant wavelength of the WGM microcavity sensor to change.

[0109] The Lorentz line shape of the mode field energy of the WGM microcavity sensor in the transmission spectrum is used as the response signal. The sensing process will cause mode movement, and the movement of the resonant wavelength will characterize the quantitative change of the Lorentz line shape of the WGM microcavity sensor. The basic sensing principle of the WGM microcavity sensor can be expressed as:

[0110] 2πn eff a=mλ 0

[0111] Among them, λ 0 represents the resonant wavelength, m is a constant, a represents the radius of the microcavity, and n eff The physical quantity that is related to the refractive index of the material of the microcavity itself and the refractive index of the environment where the evanescent field outside the cavity is located is called the effective refractive index.

[0112] The first resonant cavity sensor 41 may be a spherical structure. The spherical microcavity may be made of a photorefractive material, such as a ferroelectric crystal, a silicon-bismuth family non-ferroelectric oxide, an organic polymer material, and a semiconductor material (e.g., InP, CdTe). The refractive index of the photorefractive material changes with the change of the intensity of the external ambient light, that is, the refractive index n of the spherical microcavity eff changes with the ambient light intensity, causing the resonant wavelength λ 0 changes have occurred.

[0113] The second resonant cavity sensor 42 may be a spherical structure, which may include a first structure and a second structure. The second structure wraps the first structure and there is a gap between the second structure and the first structure. The materials of the first structure and the second structure have different sensitivities to temperature, that is, under the same temperature change, the first structure and the second structure have different degrees of deformation. For example, the first structure uses a material that is highly sensitive to temperature, such as PMMA (Acrylic), and the second structure uses a material that is less sensitive to temperature, such as quartz glass. The gap between the first structure and the second structure is filled (preferably filled) with a first fluid, and the refractive index of the first fluid changes with its volume. In the process of sensing using the second resonant cavity sensor, the first structure and the second structure produce different degrees of deformation, thereby stretching or squeezing the first fluid, causing the volume of the first fluid to change, and then causing the refractive index n of the first fluid to change. eff changes, so the resonant wavelength λ 0 The first fluid may be a transparent colloid.

[0114] The diameter of the spherical structure of the first resonant cavity sensor 41 and the second resonant cavity sensor 42 may be 300-500 μm, and the sizes of the spherical structure of the first resonant cavity sensor 41 and the second resonant cavity sensor 42 may be the same or different, which is not specifically limited here.

[0115] In other examples, one of the first resonant cavity sensor 41 and the second resonant cavity sensor 42 may be a WGM microcavity sensor, and the other may be another type of resonant cavity sensor such as an FP microcavity sensor.

[0116] like Figure 7 As shown, in this example, the lighting device further includes a first optical fiber 60; the first resonant cavity sensor 41 and the second resonant cavity sensor 42 are respectively coupled to the first optical fiber 60, and both 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 a 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 polarized light continues to transmit forward after passing through the first resonant cavity sensor 41, and the 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 resonant wave and the second resonant wave to the brightness adjustment unit 50, so that the brightness adjustment unit 50 adjusts the light emitting brightness of the OLED light emitting device 20 according to the wavelength of the second resonant wave and the wavelength of the first resonant wave. The material of the first optical fiber 60 can be quartz, plastic, etc., which is not specifically limited here.

[0118] In this example, the first resonant cavity sensor 41 and the second resonant cavity sensor 42 are coupled to the first optical fiber 60 respectively, and the first resonant cavity sensor 41 and the second resonant cavity sensor 42 can be bonded to the first optical fiber 60 respectively by using glue, and then the glue is cured by ultraviolet light.

[0119] like Figure 7 and Fig. 9As shown, in this example, the first optical fiber 60 includes a first optical fiber cone 63 and a second optical fiber cone 62, and a first optical fiber segment 61 connected to an end of the first optical fiber cone 63 away from the second optical fiber cone 65, a second optical fiber segment 62 connected to an end of the second optical fiber cone 65 away from the first optical fiber cone 63, and a third optical fiber segment 64 connected between the first optical fiber cone 63 and the second optical fiber cone 65; the first resonant cavity sensor 41 is fixed to the first optical fiber cone 63, and the two are coupled; the second resonant cavity sensor 42 is fixed to the second optical fiber cone 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 optical fiber segment 61, and the first polarized light then reaches the first optical fiber cone 63, couples with the resonant wave of the first resonant cavity sensor 41, and generates a first resonant wave. Subsequently, the first polarized light is transmitted in the third optical fiber segment 64 and reaches the second optical fiber cone 65, couples with the resonant wave of the second resonant cavity sensor 42, and generates a second resonant wave. The first polarized light transmits the first resonant wave and the second resonant wave to the brightness adjustment unit 50.

[0121] In this example, the method of preparing the first optical fiber taper 63 and the second optical fiber taper 65 is the same as that in the first example, and will not be described again.

[0122] The first resonant cavity sensor 41 can be fixed at the cone area of ​​the first optical fiber cone 63 by dispensing glue, and then the dispensing glue is cured by ultraviolet lamp; the second resonant cavity sensor 42 can be fixed at the cone area of ​​the second optical fiber cone 65 by dispensing glue, and then the dispensing glue is cured by ultraviolet lamp. In one embodiment, the first resonant cavity sensor 41 can be fixed at the position where the diameter of the first optical fiber cone 63 is the smallest, and the second resonant cavity sensor 42 can be fixed at the position where the diameter of the second optical fiber cone 65 is the smallest. The minimum diameter of the first optical fiber cone 63 and the second optical fiber cone 65 can be 6 to 12 μm.

[0123] like Fig.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 in sequence along a direction away from the base 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 base 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 may be the area covered by the orthographic projection of the light-emitting layer 22 of the OLED light-emitting device 20 on the base substrate 10 , and the non-light-emitting area DA may be the area other than the light-emitting area LA, and the non-light-emitting area DA surrounds the light-emitting area LA.

[0126] In one embodiment, the second resonant cavity sensor is arranged in the light-emitting area, so that the operating temperature of the OLED light-emitting device can be detected more accurately. The second resonant cavity sensor is arranged in the center of the light-emitting area, so that the accuracy of the detection of the operating temperature of the OLED light-emitting device can be further improved, thereby achieving a more precise adjustment of the light-emitting brightness of the OLED light-emitting device.

[0127] like Figure 7 As shown, in this example, the first optical fiber 60 is symmetrically arranged 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 symmetry axis.

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

[0129] like Figure 7 and Fig. 9 As shown, in this example, the third optical fiber segment 64 is bent and divided into a first connection portion 641, a second connection portion 642, and a bending portion 643 connecting the first connection portion 641 and the second connection portion 642; the first optical fiber segment 61 is connected to the first connection portion 641 through a first optical fiber cone 63; the second optical fiber segment 62 is connected to the second connection portion 642 through a second optical fiber cone 65; the first connection portion 641 and the second connection portion 642 are fixed to each other through a first fixing portion 81; the first optical fiber segment 61 and the second optical fiber segment 62 are fixed to each other through a second fixing portion 82.

[0130] In this example, the first fixing portion 81 and the second fixing portion 82 can be glue dispensers or other devices that can achieve a fixing effect, which are not specifically limited here. By providing the first fixing portion 81 and the second fixing portion 82, the structure of the first optical fiber 60 can be made more solid, which is conducive to the solid coupling between the first resonant cavity sensor 41 and the second resonant cavity sensor 42 and the first optical fiber 60.

[0131] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill 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 arranged on the substrate; wherein: The lighting device further comprises: A first light source configured to generate a first polarized light having a first predetermined wavelength; A first resonant cavity sensor is configured to generate a first resonant wave according to the received first polarized light and external ambient light; The brightness adjustment unit is configured to adjust the light emitting brightness of the light emitting device at least according to the sensed wavelength of the first resonance wave.

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

3. The lighting device according to claim 1, wherein: It also includes a first optical fiber; the first resonant cavity sensor is coupled to the first optical fiber, and two ends of the first optical fiber are respectively connected to the first light source and the brightness adjustment unit.

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

5. The lighting device according to claim 4, 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.

6. The lighting device according to claim 5, wherein: The first optical fiber passes through the center of the light-emitting area and surrounds the non-light-emitting area.

7. The lighting device according to claim 6, wherein: 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 a symmetry axis.

8. The lighting device according to claim 3, wherein: An interlayer dielectric layer is provided between the first optical fiber, the first resonant cavity sensor and the light emitting device.

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

10. The lighting device according to claim 9, wherein: The brightness adjustment unit includes a second light detector and a second signal processing unit; The second photodetector is configured to generate a corresponding second electrical signal according to the sensed wavelength of the first resonance wave and the wavelength of the second resonance wave; The second signal processing unit is configured to generate a corresponding second brightness control signal according to the received second electrical signal, and adjust the light emitting brightness of the light emitting device using the second brightness control signal.

11. The lighting device according to claim 9, wherein: 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 two ends of the first optical fiber are respectively connected to the first light source and the brightness adjustment unit.

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

13. The lighting device according to claim 12, 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 and the second resonant cavity sensor are both located in the light emitting area, and one of them covers the center of the light emitting area.

14. The lighting device according to claim 13, wherein: The first optical fibers are symmetrically arranged around the center of the light emitting area, with a straight line passing through the center of the light emitting area as a symmetry axis.

15. The lighting device according to claim 14, wherein: The third optical fiber segment is bent to divide the third optical fiber segment into a first connecting portion, a second connecting portion, and a bending portion connecting the first connecting portion and the second connecting portion; the first optical fiber segment is connected to the first connecting portion through the first optical fiber cone; the second optical fiber segment is connected to the second connecting portion through the second optical fiber cone; The first connecting portion and the second connecting portion are fixed by a first fixing portion; The first optical fiber segment and the second optical fiber segment are fixed to each other via a second fixing portion.

16. The lighting device according to claim 9, wherein: The light emitting device comprises a first electrode, a light emitting layer and a second electrode which are sequentially arranged in a direction away from the substrate; the first resonant cavity sensor and the second resonant cavity sensor are both located on a side of the first electrode close to the substrate.

17. The lighting device according to claim 9, wherein: The first resonant cavity sensor and / or the second resonant cavity sensor is a whispering gallery mode resonant cavity sensor.

18. 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 laser light having a first preset wavelength; The polarization controller is configured to control the polarization state of the laser light of the first preset wavelength to generate the first polarized light.

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