CN211289623U

CN211289623U - OLED lens lighting module

Info

Publication number: CN211289623U
Application number: CN201922395862.XU
Authority: CN
Inventors: 王静; 庞惠卿; 丁尚
Original assignee: Beijing Xiahe Technology Co ltd
Current assignee: Beijing Xiahe Technology Co ltd; Beijing Summer Sprout Technology Co Ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2020-08-18
Anticipated expiration: 2029-12-27

Abstract

An OLED lens illumination module is disclosed. The OLED lens illumination module comprises an OLED illumination dot matrix and at least one lens; the OLED lighting lattice comprises a plurality of OLED devices, and the filling factor of the OLED lighting lattice is less than 80%; the OLED device comprises a first surface and a second surface, wherein only one of the first surface and the second surface emits light; the lens comprises a central plane and at least one curved surface; wherein the lens diameter is not less than 10 mm; wherein one of the central plane and the at least one curved surface of the lens is coupled with at least one of the first surface and the second surface of the OLED device. The OLED lens lighting module combines an OLED lighting dot matrix and a lens, can provide a sufficient light source for local amplification observation, maintains the advantages of small volume, cold light source, portability and the like, and is more convenient to use.

Description

OLED lens lighting module

Technical Field

The invention relates to an illumination module with an amplification effect and a preparation method thereof. And more particularly, to an OLED illumination dot matrix and lens combined illumination magnification module and a method of manufacturing the same.

Background

In life, people sometimes need to enlarge the part of an observed object by using the lens under specific brightness, for example, under various scenes such as antique appreciation of jewelry, maintenance of precise parts, fine carving and the like, and the device combining illumination and the lens is very useful at this time. (http:// xjd.ea3w.com/21/219274. html). At the 4-month-2010 Hongkong lighting exhibition, the new concept of a lighting device with a magnifying glass attached to an LED desk lamp has been shown to appeal to both customers and visitors (https:// www.ledinside.cn/products/20190425-45135. html). Besides designing such lighting devices in the shape of a desk lamp with a stand, Kenko Tokina introduced in 2019 LED lamp hand magnifier with different magnifications and also received wide acceptance in the market. In the design of such lighting devices, the number and arrangement positions of the LED lamps (for example, the LED lamps are arranged around the edge of the magnifier one circle or on one side), the multiple of the magnifier used, or the type of magnifier used (for example, a common magnifier or an aspheric, multifocal magnifier). The light source in such products is an LED lamp bead, which itself occupies a certain space volume, and the LED light source usually requires an additional heat dissipation device, resulting in an awkward appearance design of such devices. In addition, the LED lamp beads are usually opaque modules, so the LED lamp beads are integrated outside a lens for observation so as not to affect normal use, and the volume of the product is further increased. Finally, LEDs are point light sources, and even if they are arranged in an array, there is a problem of uneven light intensity, which also affects the use of the observer.

On the other hand, OLEDs have received much attention as a new light source over the past decades. In particular, the characteristics of surface light source, cold light source, flexibility, transparency, etc. of the OLED make it particularly attractive in the field of illumination. Examples of transparent OLED light emitting panels in combination with other non-transparent panels or reflecting sources etc. for illumination are disclosed in CN110299349A, CN109555983A and CN 109253404A. The transparent OLED panels in these examples utilize the property that the cathode and anode are transparent at the same time, so that the emitted light exits from both electrodes. It is well known that such transparent OLED panels have lower luminous efficiency than single-sided light emitting devices, such as bottom-emitting or top-emitting OLEDs. Furthermore, if such a transparent OLED panel is directly superimposed on the lens, the outgoing light directed to the side of the viewer will interfere with the viewer's line of sight.

The transparency of the transparent A column display screen and the navigator of the vehicle shown by the SID in 2019 is about 50%. Instead of using double-sided electrodes as transparent electrodes, the method of using OLED as a transparent device is to use a single-sided light emitting device as a lattice, and adjust the area ratio of the light emitting region to the transmission region to make the device have different transparency, as described in KR101701090B1 and US8558222 (https:// online array. This is the method commonly used by the currently demonstrated transparent OLED or Micro-LED display devices. However, since the driving circuit of the display backplane is usually non-transparent, a part of the transparency is reduced. On the other hand, in order to display a moving image, the light-emitting panel must maintain a certain number of pixels, and the filling factor is generally 50% or more, and the filling factor is as low as 20% in some patents, but this is achieved at the expense of the luminance and the resolution of the moving image, such as CN 102130148B. In these technologies, the OLED panel functions as a display screen with dynamic images in a planar form, which is completely different from the light source with the magnifying function studied in the present invention.

In the field of OLED lighting and display, a lens array is generally fabricated on an OLED light-emitting surface to reduce total reflection of the light-emitting surface, thereby achieving the purpose of enhancing light extraction efficiency. The smaller the diameter and the larger the radius ratio of the lens array, the higher its light extraction efficiency, so that microlens arrays with diameters on the order of microns are mainly used at present to improve the light extraction efficiency, as described in US20030020399a 1. In addition, the micro lens has the advantages of light weight, small volume and the like, and is widely applied to the fields of optical communication, aerospace, biomedicine and the like. The micro-lens array is adopted to replace the traditional lens, the weight and the volume are greatly reduced, and the micro-lens array is widely applied to a near-eye display system. In CN103823305B, a near-eye display optical system of curved microlens array is reported, which attaches a flexible OLED display element on a spherical shell, and requires that the positions of the light emitting units of the flexible OLED display element on the spherical surface and the positions of the microlens array units on the spherical surface are in one-to-one correspondence, and the centers of the two are on the same radius after the assembly is completed. The microlenses used in the above examples are all on the order of microns and are generally arranged in an array in the light-emitting path of the OLED panel and are generally aligned with individual pixels, which essentially couple and spread more light out of the panel so that a viewer on one side of the light path of the panel can view more light. The lens in the invention is firstly a conventional lens with the size of centimeter or more, an OLED lighting array which mainly uses white light is used, in order to realize transparency, OLED devices need to meet a certain filling factor proportion when being arranged, the most important point is that the lens is not used for amplifying illumination, but used for amplifying an observed object by using OLED as a transparent light source and matching with the lens, so that an observer does not need to be positioned at one side of an OLED light-emitting light path.

US9741968 discloses a lighting module combining a planar OLED light-emitting panel with a hemispherical lens. Also, in this combination, lenses are added to enhance light extraction efficiency, while OLED light emitting panels use bottom emitting device structures for maximum efficiency and high fill factors to achieve sufficient illumination. This is different from both the starting point and the implementation of the present invention. And the module of US9741968 has a specific assembly mode, which is not particularly required by the present invention.

Finally, if one wants to integrate a single-sided light-emitting OLED device onto a lens, additional processing and reasonable layout are required, which are not addressed by the prior art.

The invention discloses an OLED lens lighting module combining an OLED lighting dot matrix and a lens and a preparation method thereof.

Disclosure of Invention

The invention aims to provide an OLED lens lighting module combining an OLED lighting dot matrix and a lens and a preparation method thereof, so as to solve at least part of the problems. When the OLED lighting dot matrix is used in combination with the lens, the OLED lighting dot matrix not only can be used for lighting, but also can play a role in amplifying an observed object; meanwhile, the OLED is a cold light source, so that the influence on some special observation objects caused by heat dissipation of the light source can be avoided.

According to an embodiment of the present invention, an OLED lens illumination module is disclosed, the OLED lens illumination module comprising: an OLED lighting lattice and at least one lens;

wherein the OLED lighting lattice comprises a plurality of OLED devices, and the fill factor of the OLED lighting lattice is less than 80%;

wherein the OLED device comprises a first surface and a second surface, wherein one and only one of the first surface and the second surface emits light;

wherein the lens comprises a central plane and at least one curved surface;

wherein the lens diameter is not less than 10 mm;

wherein one of the central plane and the at least one curved surface of the lens is coupled with at least one of the first surface and the second surface of the OLED device.

According to an embodiment of the invention, a method for manufacturing an OLED lens illumination module is disclosed, which includes: providing an OLED lighting lattice and at least one lens;

wherein the lens comprises a central plane and at least one curved surface;

the diameter of the lens is not less than 10 mm;

coupling one of the central plane and the at least one curved surface of the lens with at least one of the first surface and the second surface of the OLED device.

The Organic Light Emitting (OLED) lens illumination module combining the OLED illumination dot matrix and the lens can provide sufficient light source for local amplification observation, maintains the advantages of small volume, cold light source, portability and the like, and is more convenient to use.

Drawings

Fig. 1a-1d are schematic cross-sectional views of an OLED light-emitting panel. Wherein FIG. 1a is a basic OLED panel; FIG. 1b with a front cover film; FIG. 1c with additional encapsulation layers on the substrate; fig. 1d with a back cover film.

Fig. 2a-2h are schematic diagrams of a single-side light-emitting OLED lighting dot matrix and lens combination.

Fig. 3a is a schematic diagram of the structure of the device used in the example.

FIG. 3b is a structural diagram of the compound used in the examples.

Fig. 4a-4c are exemplary diagrams of three OLED illumination lattices.

Detailed Description

As used herein, "top" means furthest from the substrate, and "bottom" means closest to the substrate. In the case where the first layer is described as being "disposed on" the second layer, the first layer is disposed farther from the substrate. Other layers may be present between the first and second layers, unless it is specified that the first layer is "in contact with" the second layer. For example, a cathode can be described as being "disposed on" an anode even though various organic layers are present between the cathode and the anode.

As used herein, the term "OLED device" includes an anode layer, a cathode layer, one or more organic layers disposed between the anode layer and the cathode layer. An "OLED device" can be bottom emitting, i.e. from the substrate side, or top emitting, i.e. from the encapsulation layer side, or a transparent device, i.e. from both the substrate and the encapsulation side.

As used herein, the term "OLED light emitting panel" includes a substrate, an anode layer, a cathode layer, one or more organic layers disposed between the anode layer and the cathode layer, an encapsulation layer, and at least one anode contact and at least one cathode contact extending outside of the encapsulation layer for external access. An "OLED light-emitting panel" has at least more substrate, encapsulation layers, and electrical contacts than an "OLED device". The OLED light-emitting panel can comprise a plurality of OLED devices which can be independently packaged, can share the same packaging layer, can be lightened or extinguished at the same time, and can be selectively lightened or extinguished by simple metal connecting wires and external circuit control; an "OLED light-emitting panel" may also be a single "OLED device", for example, an "OLED light-emitting panel" comprising a plurality of "OLED devices" is cut so that each "OLED device" is independently controllable, and in this case, an "OLED light-emitting panel" is an "OLED device".

As used herein, the term "module" refers to an electronic device having only one set of external electrical drives. "external electric drive" refers to a power supply device other than an OLED device and may include, but is not limited to, metal wires, FPC films, a dc power supply, a USB interface, a transformer, a battery, wireless charging circuitry, and the like.

As used herein, the term "encapsulation layer" may be a thin film encapsulation having a thickness of less than 100 μm, which includes disposing one or more thin films directly onto the device, or may be a cover glass (cover glass) adhered to a substrate, or other suitable means.

As used herein, the term "flexible printed circuit" (FPC) refers to any flexible substrate coated with any one or combination of the following, including but not limited to: conductive lines, resistors, capacitors, inductors, transistors, micro-electro-mechanical systems (MEMS), and the like. The flexible substrate of the flexible printed circuit may be plastic, thin glass, thin metal foil coated with an insulating layer, fabric, leather, paper, etc. A flexible printed circuit board is typically less than 1mm thick, more preferably less than 0.7mm thick.

As used herein, the term "light extraction layer" may refer to a light diffusing film, or other microstructure having light extraction effects, or a thin film coating or the like having light outcoupling effects. The light extraction layer can be disposed on the substrate surface of the OLED, or can be in other suitable locations, such as between the substrate and the anode, or between the organic layer and the cathode, between the cathode and the encapsulation layer, on the surface of the encapsulation layer, and so forth.

As used herein, the term "light-emitting area" refers to the portion of the planar area where the anode, organic layer and cathode are co-incident, excluding light extraction effects. The "light emitting area" does not include edge light emission and does not represent a hemispherical light emitting space in three dimensions.

As used herein, a "conventional transparent OLED device" refers to an OLED device in which transparent or semi-transparent materials are used for the double-sided electrodes, and both of the device double-sided electrodes can emit light.

As used herein, "lens" refers to an optical device made of a transparent substance having a curved surface and a diameter of at least greater than 1mm, more preferably, greater than 10mm, or greater than 20 mm, or greater than 30 mm, or greater than 50 mm, or greater than 100 mm. The material can be various, such as resin, glass, quartz or other special materials; the lens can be a molded solid lens, or a liquid macromolecular polymer which is poured on one side of the OLED light-emitting device substrate or the packaging layer by using a mold, and is cured under the conditions of ultraviolet illumination or heating and the like to form a curved optical device with the light transmittance of more than or equal to 90%.

As used herein, an "illumination lattice" refers to a plurality of light sources arranged repeatedly at a pitch, thereby forming a combination of a series of light sources; the array may be an equally spaced array or a non-equally spaced array.

As used herein, "coupled" means that the light emitting device is in direct contact with 90% or more of the surface of the lens, for example, some macromolecular polymer is directly poured on the surface of the OLED device in liquid form and cured, or when the surface of the solid lens and the surface of the OLED device to be contacted are made of the same material (such as glass) and the surface is clean and smooth, the two surfaces can be directly contacted, or external pressure or heat can be applied to melt the two surfaces at the same time to form a denser contact; "coupling" may also be accomplished by filling a medium between the light emitting device and the lens surface, wherein the filled medium is a refractive index matched medium having a transmittance greater than or equal to 90% and a refractive index greater than or equal to one of the substrate or the lens of the OLED device if the filled medium is in contact with the substrate of the OLED device; if the fill medium is in contact with the encapsulation layer of the OLED device, its refractive index is greater than or equal to one of the encapsulation layer or the lens of the OLED device.

As used herein, "opaque region" refers to a region in the light source lattice where the light-emitting area and other opaque patterns (e.g., opaque metal electrodes, wires, etc.) are formed; "transparent region" refers to the area of a transparent or translucent region in a light source lattice.

As used herein, "fill factor" refers to the ratio of the area of opaque regions in a light source lattice to the total area of the lattice.

As used herein, the "central plane" of a lens refers to the plane in which the largest diameter of a lens lies.

A cross-sectional view of a basic OLED light-emitting panel is shown in fig. 1 a. The OLED light emitting panel 300 includes a substrate 301, an OLED device 310, a pair of contact electrodes 303 electrically connected to the OLED device 310, a thin film encapsulation layer 302 exposing the contact electrodes 303, and a bonding structure 304 connecting the pair of contact electrodes 303 to an external driving circuit. The substrate 301 may be rigid, such as glass, or flexible, such as plastic. In the present invention, an "OLED device" comprises an anode layer, a cathode layer, one or more organic layers disposed between the anode layer and the cathode layer. OLED device 310 may be a bottom emitting device or a top emitting device, i.e., single sided light emitting. The encapsulation layer 302 may be a glass cover slip that is glued to the substrate by an adhesive. Alternatively, the encapsulation layer 302 may be a thin film encapsulation layer, such as thin film glass, a single inorganic layer, or an organic-inorganic alternating multilayer structure. The contact electrode 303 may comprise at least one anode contact and one cathode contact. A front cover film 305 may be added to the basic OLED light emitting panel 300 as shown in fig. 1 b. The front cover film 305 may be a Flexible Printed Circuit (FPC) board on which a pre-designed circuit is printed and electrically connected to the OLED device 310 through the adhesive structure 304. In another alternative, the adhesive structure 304 may be an FPC frame and the front cover film 305 may be a sheet of plastic film to provide mechanical support. A specific description of the use of an FPC board to drive an OLED light-emitting panel can be found in chinese patent application CN208750423U, which is incorporated by reference in its entirety and is not within the scope of coverage of this application. The front cover film 305 may also include a light extraction layer. The front cover film 305 may be a combination of the above. Additional thin film encapsulation layers 306 may be applied to one or both sides of the substrate 301 as shown in fig. 1 c. The front cover film may also be coated with an additional thin film encapsulation layer 306, but is not shown in this figure. In fig. 1d, a back cover film 307 is overlaid onto the substrate 301. The back cover film 307 may be used for mechanical support. When the OLED is a bottom emission device, the back cover film 307 may be a light extraction layer. The back cover film 307 may be a combination of the above.

In the invention, a series of OLED lighting dot matrix and lens combination modes are designed. Assuming that the plane of a semi-convex lens is surface 401 and the convex surface is surface 402, a single-side emitting OLED lighting dot matrix comprises a plurality of light emitting points, the light emitting surface of which is surface 403 and the other side of which is surface 404, as shown in fig. 2 a. We couple the face 401 of the lens with the face 403 of the OLED lattice, while the face 402 of the lens is close to the object to be observed and the face 404 of the lattice is close to the viewer's eye, as shown in fig. 2 b; we can also couple the face 401 of the lens with the face 404 of the OLED lattice, the face 403 of the lattice being close to the object to be observed and the face 402 of the lens being close to the eye of the observer, as shown in fig. 2 c; when the OLED light source is a flexible substrate, we can couple the face 402 of the lens with the face 404 of the OLED dot matrix, the face 403 of the dot matrix is close to the object to be observed, and the face 401 of the lens is close to the viewer's eye, as shown in fig. 2 d; we can also couple the face 402 of the lens with the face 403 of the OLED lattice, the lens face 401 being close to the object to be observed and the face 404 of the lattice being close to the viewer's eye, as shown in fig. 2 e. When the OLED illumination lattice is used in conjunction with two semi-convex lenses, we specify that the first semi-convex lens is planar 401 and convex 402, and the second semi-convex lens is planar 405 and convex 406. We can place the OLED illumination lattice in the middle of two semi-convex lenses, coupling the face 401 of the first lens with the face 403 of the OLED lattice, the face 405 of the second lens with the face 404 of the lattice, the face 402 of the first lens being close to the object to be observed and the face 406 of the second lens being close to the eye of the viewer, as shown in fig. 2f, or vice versa; we can also couple the face 401 of the first lens with the face 405 of the second lens, the face 402 of the first lens with the face 404 of the OLED lattice, the face 403 of the lattice being close to the object to be observed and the face 406 of the second lens being close to the viewer's eye, as shown in fig. 2 g; we can also couple the face 401 of the first lens with the face 405 of the second lens, the face 402 of the first lens with the face 403 of the OLED dot matrix, the face 406 of the second lens being close to the object to be observed and the face 404 of the dot matrix being close to the eye of the observer; in the latter two designs, the two coupled semi-convex lenses can be replaced by a complete convex lens, where the face 401 of the first semi-convex lens and the face 405 of the second semi-convex lens are in the same plane, i.e. the "central plane" of the lens.

A lens may be an optic made of a transparent material having a curved surface and a diameter of at least greater than 1mm, more preferably greater than 10mm, or greater than 20 mm, or greater than 30 mm, or greater than 50 mm, or greater than 100 mm. The material may be various, such as resin, glass, quartz or other special materials. One lens may be an already molded solid lens, in which case the "coupling" may be the substrate side or package side of the OLED lattice direct contact lens. Especially when the lens surface is of the same material as the surface of the OLED illumination matrix to be bonded (e.g. the lens is glass, the substrate of the OLED matrix is also glass, or the lens is a resin material based on a macromolecular polymer, and the encapsulating layer of the OLED matrix is also a thin film encapsulation of a similar material), the surface to be contacted may be cleaned to ensure removal of dust, grease, etc., and then the two surfaces are brought into direct contact, or may be simultaneously subjected to external pressure or/and heat to form a denser contact. When the lens is in contact with the substrate side of the OLED lattice, the lens and the substrate of the OLED lattice may have the same refractive index, or differ within ± 20%; when the lens is in contact with the encapsulation layer side of the OLED dot matrix, the lens and the encapsulation layer of the OLED dot matrix may have the same refractive index, or differ by within ± 20%. One lens can also be a liquid macromolecular polymer which is cast and formed by utilizing a mould, and the liquid macromolecular polymer is cured under the conditions of ultraviolet irradiation or/and heating and the like to form a curved optical device with the light transmittance of more than or equal to 90%. In this case, the liquid lens material can be poured into the mold and the central plane thereof is kept horizontal, and then one side (substrate side or encapsulation layer side) of the OLED dot matrix is placed on the central plane and then cured to form the patterns of fig. 2b and 2 c; if the OLED dot matrix uses the flexible substrate, the flexible OLED dot matrix can be placed in a mold, and then the liquid lens material is poured on the flexible OLED dot matrix to form the patterns shown in FIGS. 2d, 2e, 2g and 2 h; the half-lens and the OLED dot matrix module which have been coupled can be further coupled with another half of the liquid lens material poured in the mold to form the mode of fig. 2 f. The method of pouring and curing the liquid lens material can further reduce gaps formed by bubbles or other surface defects, so that the lens is more tightly attached to the surface of the OLED device, and the light loss caused by refractive index change due to the introduction of air is reduced. In some embodiments, "coupling" may also include filling a medium, preferably a medium having an index of refraction matching one of the surfaces, between the light emitting device to be bonded and the lens surface, with a transmittance greater than or equal to 90%. The index of refraction of the filling medium may be greater than or equal to one of the substrate or the lens of the OLED device if the filling medium is in contact with the substrate of the OLED device, or greater than or equal to one of the encapsulation layer or the lens of the OLED device if the filling medium is in contact with the encapsulation layer of the OLED device. The contact area between the OLED lighting matrix and the lens is preferably 50% or more, more preferably 80% or more, and still more preferably 90% or more of any one of the above.

An illumination lattice means that a plurality of light sources are repeatedly arranged at a certain interval, thereby forming a combination of a series of light sources; the array may be an equally spaced array or a non-equally spaced array. Wherein the OLED light source may be a bottom emitting or top emitting device. Although the OLED device emitting light from one side is not transparent, it is less visually obstructed for the viewer when the non-emitting area of the OLED device is small and/or the fill factor of the entire module is small, and a transparency of up to 80% can be achieved in the overall view. Basically, the transparency of the lattice is determined by the density degree of the lattice, and the transparency can be regulated and controlled by adjusting the arrangement and the shape of the lattice. Each OLED light-emitting unit on the lattice can be an OLED device or a separate OLED light-emitting panel. For example, an illumination lattice 500 as shown in fig. 4a may comprise an OLED substrate 501 on which a series of OLED devices 502 are patterned, and these devices share the same encapsulation layer 503, in which case each light-emitting unit is an OLED device, and the whole illumination lattice is also a light-emitting panel. As another example, fig. 4b shows an illumination matrix 510 comprising an OLED substrate 501 and a series of OLED devices 502, but each device shares a separate encapsulating layer 513, in this case an OLED light emitting panel. On the basis of fig. 4b, the light emitting units may be further cut from the motherboard to form individual light emitting panels 520, as shown in fig. 4c, where each light emitting unit comprises an individual substrate 521, an OLED device 502 and an individual encapsulation layer 513. The individual light emitting units shown in fig. 4c can be arranged and combined through FPC or front and back cover films, etc. as required to form a lattice which is physically connected with each other, and specifically refer to the method disclosed in CN208750423U, which is not in the scope of the present invention. One of the benefits of this approach is that it is possible to improve the yield of products by screening, and at the same time, color matching can be performed, for example, the OLED light source on the dot matrix may include devices with cold white (CCT ═ 4000K) and devices with warm white (CCT <4000K) to meet different observation requirements, and devices with different color temperatures are usually prepared by different processes and need to be cut from different mother boards and recombined. The plurality of OLED light sources on the dot matrix can be simultaneously lightened or respectively lightened, for example, the central part or the peripheral part can be respectively lightened according to the observation requirement.

"opaque regions" in an OLED lighting array refer to light-emitting areas and other non-light-emitting areasTransparent patterns (e.g., opaque metal electrodes, wires, etc.), "transparent regions" refer to transparent or translucent regions in the dot matrix, and "fill factor" refers to the ratio of the area of the opaque regions in the illuminated dot matrix to the total area of the dot matrix. Typically, one of the anode or cathode of a single-sided light emitting OLED device is opaque, while the other is transparent or translucent. If the lattice is as shown in FIG. 4a, the anodes of the plurality of OLED devices need to be electrically connected to each other and the cathodes need to be electrically connected to each other. These electrical connections can be opaque metal wires, such as gold, aluminum, silver, etc., which are realized by photolithography, and can have a width of micrometer scale due to high conductivity and process tolerance, but have the disadvantages of increased opaque area, reduced fill factor, and higher manufacturing cost. Alternatively, transparent conductive oxides such as ITO, IZO, MoO may be used for these electrical connections₃Etc., or translucent metal alloys such as MgAg, or transparent metals Ca, Yb, etc. In this case, the fill factor can be greatly increased, but the conductivity of the electrical connection is impaired by the decrease in conductivity, which in turn causes non-uniform light emission from the illumination matrix. The width of these transparent metal or oxide traces or the thickness of the thin film can be increased to improve conductivity, and on the other hand, a device structure with higher current efficiency, such as a stacked device, can be used to reduce current and thus reduce voltage drop due to impedance. The electrical connection can be made to the anode layer or to the cathode layer. If the light source array is arranged in the manner of fig. 4c, an FPC board can be used as the electrical connection, which also increases the area of the opaque region but can greatly improve the conductivity and yield, as can be particularly referred to CN 208750423U.

In the following, we can obtain the requirements of the OLED lighting dot matrix in different application scenarios through calculation. Assuming that a surface light source such as an OLED is used to form a lattice which is distributed on one side of a lens plane with a diameter D, a filling factor of an illumination lattice is set to be a, wherein an opaque region is a light-emitting area (opaque regions formed by other non-light-emitting regions are negligible), and a plane area formed by taking the lens diameter as a boundary is:

the total area of the OLED lighting lattice is:

if we assume that the total luminous flux required is M, that the OLED is a standard Lambertian light source, and that all OLED light sources on the lattice have substantially uniform device properties, then the luminance per OLED unit source is:

from equation 1, the luminance L of the OLED unit light source is inversely proportional to the fill factor a and the dot matrix distribution diameter D while keeping the total luminous flux M constant. When the filling factor a or the lattice distribution diameter D is increased within a suitable range, the illumination lattice requires only a lower brightness to achieve the required luminous flux M. Also, since the luminance L is inversely proportional to the square of the diameter D, the larger D, the more rapidly L decreases, which is an essential difference from the use of an LED as a light source, as exemplified below.

For example, a desk lamp magnifier has a 127mm diameter lens and 30 LED bulbs, the total luminous flux is about 4000 lm, and each LED bulb emits about 4000/30-133 lm of light. Meanwhile, as the LED lamp beads are integrated on the periphery of the lens, the outer diameter of the whole system is enlarged to 240mm, the utilization rate of the effective area is very low, and the whole system is heavy. At this time, if an OLED illumination lattice is used, assuming a fill factor of 50%, when the lattice is arranged using a lens having a diameter of 127mm, it is possible to calculate 100,510cd/m required for the light intensity of a unit light source according to equation 1². However, if a lens with a diameter of 240mm is used, the required light intensity drops sharply to 28,144cd/m². If a lens with a diameter of 300mm is further used, the required light intensity is only 18,018cd/m². For OLEDs, the brightness is strongly related to the current density, the lower the brightness L isA lower current density J should be applied, which may lead to a longer service life. Thus, the larger the lens area, the more advantageous the use of an OLED lighting array as a light source. On the other hand, the higher the fill factor, the lower the required brightness, but the higher the fill factor, the lower the transparency, so the fill factor should be less than 80%, preferably less than 50%, preferably less than 40%, preferably less than 30%, more preferably less than 10% in the lighting module.

Compared with the LED, the OLED lighting dot matrix has more light-emitting units, so that the light can be emitted more uniformly, and meanwhile, the light source in each dot matrix does not need high brightness to illuminate a farther position. Meanwhile, strong light caused by high brightness of the LED can make eyes tired more easily, increase the burden of the eyes on the visual objects, and bring irreversible influence such as myopia and the like after long-time use. The OLED lighting dot matrix can be used for obtaining a visual environment with uniform light distribution, the healthy work of human eyes is guaranteed, meanwhile, the larger the diameter of the lens is, the higher the effective area utilization rate is, and the lower the light intensity required by the unit light source of the OLED lighting dot matrix under the same luminous flux is, so that the service life is prolonged.

wherein the lens comprises a central plane and at least one curved surface;

wherein the lens diameter is not less than 10 mm;

According to one embodiment of the present invention, the OLED lens lighting module further comprises at least one substrate, and at least one OLED device is disposed on the substrate, each OLED device having an encapsulation layer disposed thereon.

According to an embodiment of the present invention, wherein the substrate is a rigid substrate or a flexible substrate; the difference between the refractive index of the substrate and the refractive index of the lens is within +/-20%.

When the substrate is a rigid substrate in this embodiment, the rigid substrate may be glass or the like. When the substrate is a flexible substrate, the flexible substrate may be plastic, thin glass, thin metal foil coated with an insulating layer, fabric, leather, paper, or the like.

According to an embodiment of the invention, wherein the encapsulation layer is rigid or flexible; the difference between the refractive index of the packaging layer and the refractive index of the lens is within +/-20%; the encapsulation layer may be continuous or discontinuous throughout the lattice.

According to one embodiment of the present invention, the OLED lens illumination module further comprises a plurality of substrates, each substrate having at least one OLED device disposed thereon.

According to one embodiment of the invention, wherein the OLED devices in the OLED lighting lattice emit white light.

According to one embodiment of the present invention, the color temperature deviation of the white light emitted by at least two of the OLED devices is above 200K.

According to one embodiment of the invention, the OLED lens illumination module further comprises an index matching medium filled between the lens and the first surface or the second surface of the OLED device.

According to one embodiment of the present invention, wherein the transmittance of the index matching medium has 90% or more.

According to one embodiment of the invention, wherein the index matching medium has an index of refraction greater than or equal to the lens.

According to an embodiment of the invention, wherein the coupling of the lens to the OLED lighting lattice further comprises a coupling formed by casting a liquid lens material on the first surface or the second surface of the OLED lighting lattice and curing.

According to one embodiment of the invention, the plurality of OLED devices form an OLED lighting lattice in an equally spaced, or non-equally spaced, arrangement.

According to one embodiment of the present invention, the plurality of OLED devices can be simultaneously or separately illuminated.

According to one embodiment of the invention, wherein the OLED lighting lattice further comprises electrical connections.

According to one embodiment of the present invention, wherein the electrical connection comprises a transparent conductive material, or a metal material, or an FPC board.

According to an embodiment of the invention, wherein the fill factor is less than 50%, or less than 40%, or less than 30%, or less than 10%.

wherein the lens comprises a central plane and at least one curved surface;

the diameter of the lens is not less than 10 mm;

According to an embodiment of the present invention, the method for manufacturing an OLED lens illumination module further includes filling an index matching medium between the lens and the first surface or the second surface of the OLED device.

According to an embodiment of the invention, in the preparation method of the OLED lens illumination module, the transmittance of the refractive index matching medium is 90% or more.

According to an embodiment of the invention, in the preparation method of the OLED lens illumination module, the refractive index of the refractive index matching medium is greater than or equal to that of the lens.

According to an embodiment of the present invention, the method for manufacturing the OLED lens lighting module further includes pouring a liquid lens material on at least one of the first surface or the second surface of the OLED lighting lattice, and curing to form a coupling.

Examples

Hereinafter, the present invention will be described in more detail with reference to the following examples. It is apparent that the following examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Based on the following examples, a person skilled in the art will be able to modify them in order to obtain further embodiments of the invention.

We designed a series of layouts to make a practical OLED lighting matrix, the layouts comprising anode layers, organic layers, cathode layers and encapsulation layers. The anode layer also includes a portion of the electrical connection and the cathode layer also includes a portion of the electrical connection. If the substrate is a 6 inch by 6 inch square glass, with 72 light emitting units of 8 rows by 9 columns uniformly distributed, each light emitting unit having a light emitting area of 1.6mm by 1.6mm and an opaque area for electrical connection of 6.6mm by 1.6mm, wherein the dot matrix row spacing is 16mm and the column spacing is 17mm, the fill factor a of the substrate is calculated to be (8.2 1.6)/(16.17) ═ 4.8%. Region a and region a are in electrical contact with their cathodes, and region B are in electrical contact with their anodes. Note that the layout in this embodiment is merely an example, and in order to balance transparency and conductivity, the electrical connection in this embodiment uses a transparent anode layer material with low conductivity in part and an opaque cathode layer material with high conductivity in part. Additional highly conductive transparent materials may also be patterned for use as electrical connections, or the transparency may be improved by further optimizing the cathode or anode pattern to reduce the fill factor. These are all well known to those skilled in the art and are not within the scope of the present invention.

Then, a green OLED lighting dot matrix is manufactured according to the layout, and the device structure of the green OLED lighting dot matrix is shown in the figureShown in figure 3 a. The device is a bottom emitting device comprising a 0.7mm thick glass substrate 801, one

A thick ITO layer 802 is coated on a substrate 801, one layer comprising

A Hole Injection Layer (HIL)803 of compound HI, one layer comprising

A Hole Transport Layer (HTL)804 of a compound HT, one layer comprising

Electron Blocking Layer (EBL)805 of compound GH1, one layer

The light emitting layer (EML)806 includes two green host materials, compound GH1 and compound GH2, and one green light emitting material (compound GD), and the weight ratio of the compound GH1, the compound GH2, and the compound GD is 46: 46: 8, one layer comprises

Hole Blocking Layer (HBL)807 of compound GH2, a layer

The Electron Transport Layer (ETL)808 comprises a compound ET doped with 60% 8-hydroxyquinoline-Lithium (LiQ), and finally

As an Electron Injection Layer (EIL)809, and vapor-depositing

As cathode 810. All the organic layers and the cathode layer are in a vacuum environment

Figure DEST_PATH_GDA00025525538100000810

Evaporated and encapsulated with a 0.7mm thick glass cover slip in a nitrogen atmosphere, the encapsulation glue being cured with UV light. The structures of the compounds used in the examples are shown in FIG. 3 b. According to the layout and the device structure, a green OLED lighting dot matrix is manufactured. Similarly, other embodiments with emission wavelengths between 400-700nm may be made and are not specifically described herein. Under the condition of not using a lens, the OLED lighting dot matrix can uniformly light characters to be observed, but the characters are smaller, so that the requirements on the eyesight of an observer are higher, and the reading experience is influenced.

Example 1:

we couple the green OLED illumination lattice described above with a semi-convex lens according to the pattern of fig. 2 c. Let us define the distance between the light-emitting surface of the single-side illumination lattice and the object to be observed as D1. For convenience of fixation, the original D1 is set to be 15mm, and the font to be observed has obvious amplification effect in the area of the lens; when D1 is 35mm, 45mm, 55mm, 65mm or 85mm, the characters to be observed have little change in the area of the lens, and are all brighter and have magnifying effect. Therefore, in the case of embodiment 1, the OLED illumination amplification module can be used as a light source with uniform light intensity to illuminate characters, and has a certain amplification effect on the characters, thereby being more beneficial to observation.

Example 2:

we couple the green OLED illumination lattice described above with two semi-convex lenses according to the pattern of fig. 2 f. In the same manner as in embodiment 1, the distance between the light-emitting surface of the single-side illumination lattice and the object to be observed is defined as D2. When D2 ═ 22mm, a clear dark spot at the center of the lens was observed; even when D2 is 25mm, we can clearly see that the lens, although it plays a role of magnifying and illuminating, has uneven brightness in the area of the lens. When D2 is 35mm or 45mm, the brightness and magnification of the character to be observed are improved significantly within the lens area. When D2 is 55mm, the brightness and magnification of the font to be observed are further improved in the lens region, but the font is distorted and distorted. Therefore, in the case of embodiment 2, the distance dependency of the magnification and illumination effect on the object to be observed and the lens is large, and the optimum distance is about 45 mm.

Note that, due to the limitation of experimental conditions, the above embodiment is only illustrative, and thus it can be seen in the figure that the opaque region in the lattice blocks a part of the content to be observed. However, the arrangement and shape of the lattice can be easily modified, such as to be smaller rectangular or circular, or to be sparsely arranged to increase the transmittance. In this embodiment, although a plurality of OLED light sources are simultaneously illuminated on the same substrate, in other embodiments, they may be illuminated separately, for example, in the central portion or the peripheral portion, according to the observation requirement. Alternatively, a plurality of OLED light sources may be cut from different substrates and reassembled (refer to the method disclosed in CN 208750423U), which may improve the production yield, or may select different shapes or even different colors for combination, for example, the plurality of OLED light sources may include a device with cold white light and a device with warm white light to meet different observation requirements. Also, the device structure here is merely an example, and light of different colors can be produced, such as white light illumination. In addition, the device efficiency can be improved by optimizing the device structure, and the requirement on the number or the area of the lighting lattices is further reduced. For example, a stacked white light (Fung et al, adv. mater.2016, pp.1-28) can achieve high brightness at low current densities. Finally, the coupling lens and the illumination matrix can also be realized by using an index matching fluid or some polymer cured by UV, and even the lens itself can be cured by pouring the polymer on the illumination matrix in advance. The above knowledge is well known to those skilled in the art and is not discussed in the present invention.

It should be understood that the various embodiments described herein are illustrative only and are not intended to limit the scope of the invention. Thus, the invention as claimed may include variations from the specific embodiments and preferred embodiments described herein, as will be apparent to those skilled in the art. Many of the materials and structures described herein may be substituted with other materials and structures without departing from the spirit of the present invention. It should be understood that various theories as to why the invention works are not intended to be limiting.

Claims

1. An OLED lens lighting module, said OLED lens lighting module comprising: an OLED lighting lattice and at least one lens;

wherein the lens comprises a central plane and at least one curved surface;

wherein the lens diameter is not less than 10 mm;

2. The OLED lens lighting module of claim 1, further comprising at least one substrate, and at least one OLED device disposed on the substrate, each OLED device having an encapsulation layer disposed thereon.

3. The OLED lens illumination module of claim 2, said substrate being a rigid substrate or a flexible substrate; the difference between the refractive index of the substrate and the refractive index of the lens is within +/-20%.

4. The OLED lens lighting module of claim 2, said encapsulation layer being rigid or flexible; the difference between the refractive index of the packaging layer and the refractive index of the lens is within +/-20%; the encapsulation layer may be continuous or discontinuous throughout the lattice.

5. The OLED lens illumination module of claim 1, further comprising a plurality of substrates, each substrate having at least one OLED device disposed thereon.

6. The OLED lens illumination module set forth in claim 1, wherein the OLED devices in the OLED illumination lattice emit white light.

7. The OLED lens illumination module set forth in claim 6 wherein the OLED devices in the OLED illumination array emit white light, and the deviation in color temperature of the white light emitted by at least two of the OLED devices is greater than 200K.

8. The OLED lens illumination module of claim 1, further comprising an index matching medium filled between the lens and the first or second surface of the OLED device.

9. The OLED lens illumination module set forth in claim 8, wherein the index matching medium has a transmittance of 90% or greater, or the index matching medium has a refractive index greater than or equal to that of the lens.

10. The OLED lens lighting module of claim 1, wherein the coupling of the lens to the OLED lighting array further comprises a coupling formed by a liquid lens material poured onto the first surface or the second surface of the OLED lighting array and cured.

11. The OLED lens illumination module set forth in claim 1, wherein the plurality of OLED devices are arranged in an equally spaced, or unequally spaced, arrangement to form an OLED illumination lattice.

12. The OLED lens illumination module set forth in claim 1, wherein said plurality of OLED devices can be illuminated simultaneously or in zones.

13. The OLED lens illumination module of claim 1, said OLED illumination lattice further comprising electrical connections.

14. The OLED lens lighting module of claim 13, said electrical connections comprising transparent conductive materials, metallic materials, or FPC boards.

15. The OLED lens illumination module of claim 1, wherein the fill factor is less than 50%, or less than 40%, or less than 30%, or less than 10%.