Optical fiber flexible transparent film lighting device

Abstract

The optical fiber flexible transparent thin film lighting device has the advantages of being ultrathin, soft, transparent, uniform, elastic and deformable, the optical fiber flexible transparent thin film lighting device is formed by one or more multimode quartz optical fibers which are adjacent in an end-to-end parallel mode, the multimode quartz optical fibers are evenly distributed and embedded in a plane flexible plastic thin film according to a rule, and the surface of the plastic thin film is covered with a fluorescent layer. The fluorescent layer is formed by mixing a photoluminescent material and an adhesive; one end of the optical fiber is coupled with a semiconductor laser, and the semiconductor laser emits laser, so that the surface of the multimode quartz optical fiber forms overall 360-degree scattering luminescence, the photoluminescence material in the fluorescent layer is excited to generate uniform visible light, and uniform large-area luminescence of the planar elastic soft plastic film is realized. The glass can be widely applied to the fields of advertising window glass, lighting lamps, flat panel display back lighting, building doors and windows, lighting, indication, lighting and the like of vehicles. The ultra-thin LCD display back lighting device can be used for portable mobile display screens such as mobile phones and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of display applications. Technical Background

[0002] Existing surface light source emitting devices are widely used in the fields of display and lighting. In particular, the backlight sources supporting liquid crystal displays (LCDs) have a large market demand. The existing panel light-emitting devices are mainly active light-emitting surface light sources or optical surface light sources. The typical light-emitting devices of the former include electroluminescence (EL), organic electroluminescence (OEL, OLED), quantum dot electroluminescence, etc. Their advantages are relatively thin structures, but the disadvantages are high power consumption, complex processes, high costs, etc.; the latter surface light source realizes the planar form light-emitting effect through external intervention technologies such as optical light guiding, refraction and reflection. It usually has a complex and thick light guiding structure, such as an LED light guide plate or a Mini LED light homogenizing plate used as a backlight. They all require various functional films to form a backlight illumination with a thickness of more than 1-3 mm. When applied to LCD large-screen TVs, they have the disadvantages of large weight, poor uniformity, non-deformability, opacity, non-bendability, high power consumption, etc. When applied to mobile phone and computer display screens, they have the disadvantages of large screen thickness, non-bendability, and high power consumption.

[0003] A fiber optic flexible transparent film lighting device of the present invention has the advantages of being planar, ultra-thin, elastic, soft, transparent, and uniform. It is one or more multimode quartz fibers with their heads and tails adjacent in parallel, and the multimode quartz fibers are evenly distributed regularly and embedded in a planar flexible plastic film. The surface of the plastic film is covered with a fluorescent layer, and the fluorescent layer is composed of a photoluminescent material and an adhesive; one end of the optical fiber is coupled with a semiconductor laser, and the semiconductor laser emits laser light, so that the surface of the multimode quartz fiber forms a 360-degree overall scattered light emission, and the photoluminescent material in the fluorescent layer is excited to generate uniform visible light, realizing planar, elastic, soft, and uniform large-area light emission of the plastic film.

[0004] The present invention can be widely used in advertising display windows, lighting fixtures, planar display backlighting, building doors and windows, light emission, indication, lighting and other application fields of transportation tools. As an ultra-thin LCD display backlighting device, the present invention can be used for ultra-large area backlighting and has deformable and elastic light emission; or it can be used for portable small-area mobile display screens such as mobile phones and can withstand impacts. Summary of the Invention

[0005] An optical fiber flexible transparent film lighting device, in which one or more multi-mode quartz optical fibers 2 are arranged adjacent to each other with their heads and tails parallel, and the multi-mode quartz optical fibers are evenly distributed in a plane flexible plastic film 1 according to a rule. The surface of the plastic film is covered with a fluorescent layer 5, and the fluorescent layer is composed of a photoluminescent material and an adhesive; one end of the optical fiber is coupled with a semiconductor laser, and the semiconductor laser emits laser light, so that the surface of the multi-mode quartz optical fiber emits light with a 360-degree overall scattering, and the photoluminescent material in the fluorescent layer is excited to generate uniform visible light, realizing large-area light emission of a flat, elastic, soft, transparent and uniform film.

[0006] In the present invention, the heads and tails of single multi-mode quartz optical fibers are arranged adjacent to each other in parallel, so that the strong light at the head 3 of the optical fiber and the weak light after loss at the tail 4 are combined to form an average large-area brightness that is the same; the multi-mode quartz optical fibers are arranged in a fine looped, wavy, or comb-like pattern, and the arrangement density forms different regular spacings and patterns according to the brightness combination, and can be stretched or elastically deformed under an external force, forming a large-area overall brightness that is uniform and elastic and can be locally elastically deformed and emit light under an external force. The head 3 of the optical fiber is coupled with a semiconductor laser, and the power of the semiconductor micro-laser can be equipped according to the area size or the length of the optical fiber.

[0007] The single multi-mode quartz optical fiber has a continuous length. The brightness at the head of the optical fiber is 110 cd / m2, the brightness at 50 meters of the optical fiber is 69 cd / m2, the brightness at 100 meters of the middle optical fiber is 36 cd / m2, the brightness at 200 meters of the tail of the optical fiber is 26 cd / m2, and the local brightness in the adjacent area between the head 3 and the tail 4 of the optical fiber is 115 cd / m2. After folding, the brightness at 100 meters of the optical fiber is 72 cd / m2. Therefore, the area density at 100 meters of the folded optical fiber is larger.

[0008] In an optical fiber flexible transparent film lighting device of the present invention, the multi-mode quartz optical fiber contains rare earth ions, which emit uniform 360-degree side light over the whole body when transmitting ultraviolet light or blue light, and the ultraviolet light or blue light can excite the photoluminescent material to emit light. The multi-mode quartz optical fiber in the present invention usually has a diameter of 0.01-0.2 mm, and the thin optical fiber is suitable for embedding in a thinner film.

[0009] The plane flexible plastic film in the present invention is one of PVC, PE, PU, and silicone films. The surface of the transparent or semi-transparent plastic film is designed with optical fiber fixing grooves, and the shape, spacing, and pattern of the grooves match the usage requirements. The thickness of the plane flexible plastic film is 0.05-0.3 mm. The fluorescent layer is pasted or coated on the surface of the flexible plastic film, and the flexible plastic film can be pasted or coated with the fluorescent layer on one side or both sides.

[0010] The fluorescent layer in the present invention is composed of a photoluminescent material and a binder material. The photoluminescent material is an inorganic or organic luminescent material, and they are fully and evenly mixed with the binder material in proportion. The binder material is one of colloid, ink, and plastic. Different binder materials are selected according to different processes. Ink is used for printing, colloid is used for scraping coating, and plastic can be used for injection molding or pasting. The fluorescent layer is a transparent or semi-transparent thin film. An achromatic transparent backlight device can be prepared using an achromatic transparent fluorescent layer, or a colored transparent fluorescent layer can also be used, or the fluorescent layer is opaque or semi-transparent. All of these need to be covered on the surface of a planar flexible plastic film. A scattering agent, a refractive material, or a reflective material can be added to the binder material to improve the uniformity and brightness of the light emission.

[0011] The photoluminescent material in the present invention is an inorganic luminescent material. The inorganic luminescent material is aluminate, silicate, etc. YAG or nitride photoluminescent materials can be combined with blue laser to convert into white light emission. The photoluminescent material is an upconversion fluorescent material that can generate visible light with near-infrared laser; the photoluminescent material is a multicolor nanometer quantum dot luminescent material that can generate transparent white light emission or colored light emission with blue laser.

[0012] The semiconductor laser in the present invention can generate ultraviolet light emission, blue light emission, and can also generate white light emission or a combination of red, blue, and green colors. The semiconductor laser generates near-infrared light emission. The semiconductor laser generates light emission and excites the photoluminescent material to emit light through a multimode quartz optical fiber, so that the fluorescent layer generates uniform light emission. The power of the semiconductor laser is 0.01 - 3 watts, and the laser is used according to the requirements of area and brightness.

[0013] In a fiber-optic flexible transparent film lighting device of the present invention, the photoluminescent material can absorb the excitation light energy emitted by the multimode quartz optical fiber and combine to generate white light emission or red, blue, and green multicolor light emission. The optical fiber in the present invention has a circular structure and can be bent, so through special design, it can also be used for non-planar lighting, such as on spherical and curved surfaces.

[0014] In a fiber-optic flexible transparent film lighting device of the present invention, the photoluminescent material is an organic luminescent material. The organic luminescent material is one of a luminescent pigment and a luminescent dye. The colorless transparent organic luminescent dye can be combined with blue laser to produce a colorless transparent thin film, and transparent white or colored light emission is generated after the laser is powered on. The organic luminescent material has the advantages of high luminous efficiency and good transparency. Description of the Drawings

[0015] Figure 1 Schematic diagram of the looped distribution structure of the fiber-optic planar flexible transparent film lighting device Figure 2 Schematic diagram of the cross-sectional structure of the fiber-optic planar flexible transparent film lighting device In the figures of the present invention: 1 flexible plastic film, 2 multimode quartz optical fiber, 3 fiber head, 4 fiber tail, 5 fluorescent layer. Specific implementation method

[0016] A fiber-optic flexible transparent film lighting device of the present invention, one or more multimode quartz optical fibers 2 are adjacent to each other with their heads and tails parallel, and the multimode quartz optical fibers are evenly distributed in a planar flexible plastic film 1 according to a rule. A fluorescent layer 5 is covered on the surface of the plastic film, and the fluorescent layer is composed of a photoluminescent material and an adhesive; one end of the optical fiber is coupled with a semiconductor laser, and the semiconductor laser emits laser light, so that the surface of the multimode quartz optical fiber emits light in a 360-degree overall scattering manner, and the photoluminescent material in the fluorescent layer is excited to generate uniform visible light, realizing uniform large-area light emission of the planar flexible plastic film, and realizing super-large-screen elastic transparent light emission, such as being wrapped on the surface of a sphere or a cone surface, avoiding the problem that LED light guide cannot be made into a large-area uniform backlight.

[0017] In the present invention, the heads and tails of a single multimode quartz optical fiber are arranged adjacent to each other in parallel ( Figure 1 ), so that the strong light at the head 3 of the optical fiber and the weak light after loss at the tail 4 are combined to form the same average brightness over a large area. As the optical fiber transmission distance increases, the optical loss increases and the light emission on the surface of the optical fiber gradually decreases. When multiple multimode quartz optical fibers are arranged, they should be parallel to each other. The head of one optical fiber is adjacent to the tail of another optical fiber in parallel. Each of the multiple multimode quartz optical fibers uses its own laser light source. The multimode quartz optical fibers are arranged in a fine looped or combed pattern form, and the arrangement density forms different regular spacings and patterns according to the brightness combination, forming a uniform overall large-area brightness. The wavy design can be stretched or elastically deformed under external force, such as spherical or conical. The multimode quartz optical fibers will not break. The head 3 of the optical fiber is coupled with a semiconductor laser, and the power of the semiconductor micro-laser can be equipped according to the area size or the optical fiber length.

[0018] A single multimode quartz optical fiber in the present invention has a continuous length, and the brightness of the optical fiber is inversely proportional to the length. The brightness of the head of a 200-meter-long multimode quartz optical fiber coupled under 1 watt of laser is 110 cd / m2, the brightness at 2 meters of this optical fiber is 109 cd / m2, the brightness at 50 meters of this optical fiber is 69 cd / m2, the brightness at 100 meters in the middle of this optical fiber is 36 cd / m2, the brightness at 200 meters at the tail of this optical fiber is 26 cd / m2, the local brightness in the adjacent area after the combination of the head 3 and the tail 4 of the optical fiber is 115 cd / m2, and the brightness of the area at 100 meters of the folded optical fiber is 72 cd / m2. Therefore, the optical fiber density in the area at 100 meters of the folded optical fiber should be large.

[0019] An optical fiber planar flexible transparent film lighting device in the present invention. The multimode quartz optical fiber contains rare earth ions thulium, ytterbium, and erbium. The multimode quartz optical fiber is colorless and transparent, and is also colorless and transparent after being embedded in the plastic film. The multimode quartz optical fiber generates uniform 360-degree side light emission when transmitting ultraviolet light or blue light. When this optical fiber transmits short-wave visible light, it has strong surface scattering, such as blue light and violet light; when transmitting long-wave visible light, it has weak side light emission, such as red light. The optical fiber of the present invention is different from the conventional communication optical fiber in that the communication optical fiber does not have the side light emission effect. Ultraviolet light or blue light can excite the photoluminescent material to emit light. The multimode quartz optical fiber in the present invention usually has a diameter of 0.01 - 0.2 mm, and the thin optical fiber is suitable for use with flexible thin films.

[0020] The planar flexible plastic film in the present invention is one of PVC, PE, PU, TPU, and silicone film. The silicone film has good elastic deformation characteristics. The surface of the transparent or semi-transparent plastic film is designed with optical fiber fixing grooves ( Figure 2 ), and the grooves are made on the surface using a laser or a scribing machine, or the etching method can also be used. The shape, spacing, and pattern of the grooves match the usage requirements. The present invention can also manufacture patterns for transparent window advertisements. The thickness of the planar flexible plastic film is 0.05 - 0.3 mm, and the thinner film is easier to bend. The surface of the flexible plastic film is closely pasted or coated with a fluorescent layer. The flexible plastic film can be pasted or coated with a fluorescent layer on one side or both sides. After making a single-sided fluorescent layer, the other side can use white or other patterns to enhance light reflection and improve uniformity. Of course, the flexible plastic film can also itself contain a light reflector, a light homogenizer, or a brightening agent.

[0021] The fluorescent layer in the present invention is composed of a photoluminescent material and a binder material, and a light reflector, a light homogenizer, or a brightening agent can also be added to improve the light emission uniformity. The photoluminescent material is an inorganic or organic light-emitting material. The latter has good transparency but is prone to aging. They are fully and evenly mixed with the binder material in proportion. The binder material is one of a colloid, an ink, and a plastic. It can be directly printed and scraped, or made into a film and then used in combination. Different binder materials are selected according to different processes. Ink is used for screen printing, colloid is used for scraping, and plastic can be used for injection molding or pasting. Of course, printing and inkjet technology can also be used. The fluorescent layer is a transparent or semi-transparent film, which is colorless and transparent or colored and transparent. Using a colorless and transparent fluorescent layer, a colorless and fully transparent backlight device can be prepared, or a colored and transparent fluorescent layer can also be used, or the fluorescent layer is opaque or semi-transparent. All of these need to be covered on the surface of the planar flexible plastic film. A scattering agent, a refracting material, or a reflecting material can be added to the binder material to improve the light emission uniformity and brightness.

[0022] The photoluminescent material in the present invention is an inorganic luminescent material, such as aluminate, silicate, etc. YAG or nitride photoluminescent materials can be combined with blue laser to convert into white light emission. White light emission is beneficial for making backlights for displays. Long afterglow materials can also be used, such as the commercially available product KPT-LED582. The photoluminescent material is an upconversion fluorescent material, such as KPT-HT111, HT112, etc., which can generate visible light with near-infrared laser. The laser light source uses a 980nm near-infrared laser; the photoluminescent material is a multicolor nanometer quantum dot luminescent material, which can generate transparent white light emission or color light emission with blue laser. The quantum dot material can be used to make a transparent fluorescent film.

[0023] The semiconductor laser in the present invention can generate ultraviolet light emission such as 405nm laser. The blue laser can use 450nm or 470nm. The semiconductor laser can also generate white light emission or red, blue, and green combined color light emission, which requires a lower requirement for the fluorescent layer. The semiconductor laser generates near-infrared 980nm light emission. The semiconductor laser generates light emission and excites the photoluminescent material to emit light through a multimode quartz optical fiber, so that the fluorescent layer generates uniform light emission. The power of the semiconductor laser is 0.01 - 3 watts, and the laser is used according to the requirements of area and brightness.

[0024] In a fiber-optic flexible transparent film planar lighting device of the present invention, the photoluminescent material can absorb the excitation light energy emitted by the multimode quartz optical fiber and combine to generate white light emission or red, blue, and green multicolor light emission.

[0025] In a fiber-optic planar flexible transparent film lighting device of the present invention, the photoluminescent material is an organic luminescent material, which is one of a luminescent pigment and a luminescent dye. The colorless organic luminescent dye can be combined with blue laser to generate a colorless transparent film, and generate transparent white or color light emission after the laser is energized. The organic luminescent material has the advantages of high efficiency and good transparency; functional materials such as photochromic can also be used to achieve the transparent color change function. The advantages of the present invention are

[0026] A fiber-optic flexible transparent film lighting device of the present invention can be used for the backlighting of liquid crystal (LCD) displays, especially for manufacturing large-area LCD displays. The existing LED backlighting light guide technology requires a multi-layer structure, and the uniformity is not good after a large area, so the area of the device is limited. The present invention can make a uniform large-area backlight and can also be spliced without traces. Since the single continuous length of the optical fiber can be more than ten thousand meters, the area can be much larger than the existing technical bottleneck according to needs.

[0027] A fiber optic flexible transparent film lighting device of the present invention can be used to produce a transparent backlight. Since the optical fiber is colorless and transparent, a colorless and transparent backlight can be made, which is used in fields such as window advertising, architectural glass, automobiles, and lighting. This makes the transparent display device simple in structure and low in cost, without generating heat and having high luminous efficiency, avoiding the heat generation of organic electroluminescent and LED devices.

[0028] A fiber optic flexible transparent film lighting device of the present invention realizes energy conservation, safety, and stability. Its light emission is through light guiding, and its blue laser can be realized ultrathin by a micro semiconductor, which can be used for ultrathin backlighting of mobile phone screens. Moreover, it has the advantages of being not afraid of vibration, shock-resistant, pasteable, bendable, elastic, and deformable, etc.

[0029] After the above description of the preferred embodiments of the present invention, it should be understood by those skilled in the art that any changes and improvements made to the present invention without departing from the spirit and scope of the present invention are within the scope of the present invention.

Claims

1. A fiber-optic flexible transparent film lighting device, in which one or more multimode quartz optical fibers are adjacent with their heads and tails parallel, and the multimode quartz optical fibers are evenly distributed regularly and embedded in a planar flexible plastic film. A fluorescent layer is covered on the surface of the plastic film, and the fluorescent layer is composed of a photoluminescent material and an adhesive; one end of the optical fiber is coupled with a semiconductor laser, and the semiconductor laser emits laser light, so that the surface of the multimode quartz optical fiber emits light with a 360-degree overall scattering, and the photoluminescent material in the fluorescent layer is excited to generate uniform visible light, realizing large-area light emission of a planar, elastic, soft, transparent and uniform film.

2. A fiber-optic flexible transparent film lighting device, in which a single multimode quartz optical fiber is arranged with its head and tail adjacent and parallel, so that the strong light at the head of the optical fiber and the loss at the tail are combined to form the same average large-area brightness; the multimode quartz optical fibers are arranged in the form of a fine wavy pattern, a loop pattern or a comb pattern, forming a large-area overall uniform brightness with elasticity, and can emit light with three-dimensional elastic deformation under the action of an external force.

3. A fiber-optic flexible transparent film lighting device, in which the multimode quartz optical fiber contains rare earth ions, and it emits uniform 360-degree side light over the whole body when transmitting ultraviolet light or blue light, and the diameter of the quartz multimode optical fiber is 0.01 - 0.2 mm.

4. A fiber-optic flexible transparent film lighting device, in which the planar flexible plastic film is one of PVC, PE, PU, and silicone films, and fixing grooves for multimode quartz optical fibers are designed on the surface of the transparent or semi-transparent plastic film, and the thickness of the planar flexible plastic film is 0.05 - 0.3 mm.

5. A fiber-optic flexible transparent film lighting device, in which the fluorescent layer is composed of a photoluminescent material and a bonding material, and the bonding material is one of a colloid, an ink, and a plastic; the fluorescent layer is a transparent or semi-transparent film and covers the surface of the planar flexible plastic film.

6. A fiber-optic flexible transparent film lighting device, in which the semiconductor laser generates ultraviolet light emission, blue light emission, white light emission or red, blue and green combined color emission, and the semiconductor laser generates near-infrared light emission; the semiconductor laser emits light and excites the photoluminescent material to emit light through the multimode quartz optical fiber, so that the fluorescent layer emits uniform light.

7. A fiber-optic flexible transparent film lighting device, in which the photoluminescent material can absorb the excitation light energy emitted by the multimode quartz optical fiber and combine to generate white light emission or red, blue and green multicolor emission.

8. A fiber-optic flexible transparent film lighting device, in which the photoluminescent material is an inorganic luminescent material, and the photoluminescent material and blue laser can be converted and combined into white light emission; the photoluminescent material is an up-conversion fluorescent material that can generate visible light with near-infrared laser; the photoluminescent material is a multicolor nano quantum dot luminescent material that can generate transparent white light emission with blue laser.

9. A fiber-optic flexible transparent film lighting device, in which the photoluminescent material is an organic luminescent material, and the organic luminescent material is one of a luminescent pigment and a luminescent dye. The colorless organic luminescent dye and blue laser are combined to produce a colorless transparent light-emitting film, which emits transparent white or colored light after being powered on.

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