TWI490426B - Light emitting device - Google Patents

Description

Illuminating device

The invention relates to a lighting module, in particular to a lighting module suitable as a large-area illumination source.

Referring to FIG. 1 , in the current illumination device 1 , if a large area of illumination is required, for example, as a backlight, it is generally required to arrange all of the plurality of illumination modules 11 in a neat manner, and then each of the illumination modules 11 is respectively labeled. Gold wires, solders, or silver dots are connected and electrically connected to each other (indicated by the gold wire 12 in FIG. 1). Thus, when the external light is supplied to the light-emitting modules 11, the light-emitting modules 11 are The light-emitting device 1 that emits light over a large area can be obtained by emitting light outward.

It can be seen from FIG. 1 that although a plurality of light-emitting modules 11 are electrically connected to each other to form a large-area light-emitting source, since the light-emitting modules 11 are arranged, the adjacent two light-emitting modules 11 are necessarily present. The gap 13 is absent, and the gap 13 cannot generate light. Therefore, when the light-emitting device 1 emits light, the gaps 13 are dark places that do not emit light, which causes a dark spot to be generated when the component emits light, so that the uniformity of the overall illumination is achieved. Poorly; secondly, because the gold wires 12 on the top surface of the light-emitting module 11 or the solders electrically connecting the light-emitting modules 11 to each other are made of an opaque material, The light emitted by the light-emitting module 11 is shielded by the opaque material distributed on the top surface of the light-emitting modules 11, so that the light-emitting device 1 has the disadvantage of low luminance.

Accordingly, it is an object of the present invention to provide a light-emitting device which can reduce the light-shielding rate and increase the light uniformity, and is suitable for large-area light emission.

Therefore, the light-emitting device of the present invention comprises a plurality of light-emitting modules arranged one above another, each of the light-emitting modules having a power-conducting substrate, an operation disposed on the substrate and generating light by photoelectric effect during power supply. a unit, and an electrode unit including a transparent electrode disposed on the actuating unit, and any two adjacent light emitting modules are stacked on another adjacent portion of the substrate of one of the light emitting modules Portions of the electrode units of the module are electrically connected to each other.

The effect of the invention is that a plurality of light-emitting modules with substrates are stacked on each other and electrically connected to form a light-emitting device capable of emitting light with a large area, thereby effectively avoiding the uniform uneven illumination caused by the gap between adjacent light-emitting modules. The problem is suitable as a large-area light source.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments of the invention.

Before the present invention is described in detail, it is noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to Figures 2 and 3, a first preferred embodiment of the illumination device of the present invention comprises a plurality of illumination modules 2 that are electrically connected to each other and that emit light when receiving electrical energy.

Each of the light-emitting modules 2 includes a substrate 21, an actuation unit 22 disposed on the substrate 21, and an electrode unit 23 covering the actuation unit 22.

In detail, the substrate 21 is electrically conductive and electrically conductive to the outside, and includes a first layer body 211 and a second layer body 212 formed on the first layer body 211. Preferably, the first layer body 211 of the substrate 21 is made of an alloy material selected from the group consisting of copper, iron, chromium, nickel, and a combination thereof, and is in the form of a sheet. More preferably, the substrate 21 is selected from the group consisting of iron having a weight percentage of not less than 60%, chromium having a weight percentage of not less than 15%, and nickel having a weight percentage of not less than 8%, which is commonly known as "white iron". The substrate 21 made of white iron is excellent in electrical conductivity and can be stretched into a sheet shape. The second layer body 212 of the substrate 21 is made of a metal as a main material, and preferably is made of molybdenum as a material on the first layer body 211.

It should be noted that since the first layer body 211 and the second layer body 212 are both conductors, the substrate 21 is electrically conductive as a whole; further, since the first layer body 211 made of white iron is a flexible sheet, The second layer body 212 is a film deposited on the first layer body 211, so that the substrate 21 has a flexible property.

The actuating unit 22 of each of the light-emitting modules 2 is integrally disposed on the surface of the substrate 21 in a thin film shape and emits light during power supply. In the first preferred embodiment, the actuating unit 22 is used. An epitaxial manner forms an n-type cladding layer, a p-type cladding layer, and an active layer sandwiched between the n- and p-type conductive layers on the substrate 21. The structure of the light-emitting diode (LED) is illustrated (not individually shown). In addition, other light-emitting modules 2 including, for example, an organic light-emitting diode structure, or other types are also applicable.

The electrode unit 23 of each of the light-emitting modules 2 is disposed on the actuating unit 22 and includes a transparent electrode 231 coupled to the actuating unit 22, and the transparent electrode 231 is formed in a film shape on the actuating unit 22 opposite to the The surface of the substrate 21 covers the entire surface of the actuating unit 22. The transparent electrode 231 is made of a light-transmissive conductive material, such as a metal oxide, a thin film of a very thin to micron size, and the like, and the current can be uniformly diffused laterally; preferably, the transparent electrode 231 is selected from the group consisting of light permeable. The metal oxide is formed, and the transparent electrode 231 has a thickness of about 1 to 2 μm. Since the material selection of the transparent electrode 231 is known to those skilled in the art, no further description is provided. In the preferred embodiment, in order to correspond to the operation of the unit 22 as a light-emitting diode (LED) structure, the transparent electrode 231 is selected from indium tin oxide (ITO) as a constituent material.

The electrode unit 23 of each of the light-emitting modules 2 further includes a finger-shaped electrode 232 disposed on the transparent electrode 231 and in ohmic contact with the transparent electrode 231. The finger-shaped electrode 232 cooperates with the transparent electrode 231 to transmit electrical energy from the outside and to supply power. In FIG. 3, the interdigitated electrodes 232 are a plurality of strips arranged in a plurality of rows. Of course, the strips are interlaced with each other. Since there are many methods for arranging the arrays, and are not the focus of the present invention, No more details.

For each of the independent light-emitting modules 2, the conductive substrate 21 of the light-emitting module 2 and the finger-shaped electrode 232 cooperate to receive external electric energy. When an external current is transmitted to the light emitting module 2 via the substrate 21 and the electrode unit 23, the transparent electrode 231 uniformly diffuses the current laterally and flows to the operating unit 22, and the operating unit 22 converts the electrical energy into light energy. The light is emitted, and the emitted light mainly travels toward the transparent electrode 231 to emit light to the outside.

In addition, the light-emitting module 2 overlaps a partial region of the substrate 21 of any of the light-emitting modules 2 with a partial region of the finger-shaped electrode 232 of the electrode unit 23 of another adjacent light-emitting module 2 And the light-emitting module 2 is configured to be connected in a stacked manner while covering the transparent electrode 231 under the finger-shaped electrode 232, and the substrate 21 and the finger-shaped electrode 232 are electrically conductive. Electrical connections can be made without gaps. Since the light-emitting modules 2 are electrically connected to each other without a gap, unlike conventional ones, when a large-area light-emitting device is composed of a plurality of light-emitting modules, dark spots are generated due to the gap, resulting in uneven illumination. In addition, since the light-emitting modules 2 are electrically connected to each other by the conductive substrate 21 and the adjacent electrode units 23, it is not necessary to perform additional wire bonding for each of the light-emitting modules 2, which simplifies the process. .

In order to clarify the manner in which the light-emitting modules 2 are superimposed, one of the two adjacent light-emitting modules 2 is referred to as a light-emitting module 2a, and the other one is adjacent to the light-emitting module 2a. The light-emitting module 2 is referred to as a light-emitting module 2b, and the light-emitting modules 2 are connected in such a manner that the light-emitting modules 2a, 2b are aligned in the same direction (the substrates 21 of the light-emitting modules 2 are all facing downwards, The electrode unit 23 of the light-emitting module 2 is facing upwards, and the finger of the electrode unit 23 of the light-emitting module 2b is connected to the predetermined area of the surface of the substrate 21 of the light-emitting module 2b. The predetermined area of the shaped electrode 232. The transparent electrode 231 of the light-emitting module 2b is also covered by the light-emitting module 2a, so that the light-emitting module 2b is disposed on the substrate 21 of the light-emitting module 2a. The module 2a and the light-emitting module 2b form a gap-free overlapping connection, and are electrically connected to each other while being connected to each other and electrically connected to each other. In particular, since the substrate 21 of the first preferred embodiment can be flexed, any of the light-emitting modules 2 can be flexed and naturally stacked on the electrode unit 23 of the adjacent light-emitting module 2 as shown in FIG. surface.

When the external electric energy is supplied through the transparent electrode 231 of the head and tail of the light-emitting module 2 and the substrate 21 (not shown), the light-emitting modules 2 connected in series are activated to emit light. Since the light-emitting modules 2 are overlapped with each other without gaps, dark spots formed by gaps between two adjacent modules of the current light-emitting device do not occur, and uneven distribution of brightness of the surface light source is also avoided, or In addition, since the substrate 21 of the light-emitting module 2 can be flexed, the stacked light-emitting devices can still be substantially flat, and are particularly suitable for application, for example, in display backlights. Large area light source.

In particular, when the light-emitting modules 2 are connected to each other in an overlapping manner, the transparent electrode 231 of any one of the light-emitting modules 2 extends along the direction in which the light-emitting module 2 extends and is not covered (ie, bare and does not The width W of the region where the substrate 21 of the remaining light-emitting module 2 is connected is not more than 20 millimeters (mm), and the thickness of the transparent electrode 231 is not less than 0.1 micrometer (μm); preferably, the width W is not more than 10 In the millimeter (mm), the thickness of the transparent electrode 231 is not less than 1 micrometer (μm), so that the current can be quickly and uniformly spread laterally uniformly.

In addition, the manner in which the light-emitting modules 2 are arranged and connected may also be connected in a ring shape connected end to end according to actual needs, or may be, for example, a wave shape, an arc shape, a polygon shape, etc., and the electrical properties of each other may also be The substrate 21 and the electrode unit 23 are slightly changed in parallel to form a parallel connection, or a partial connection, a partial parallel connection, etc., and since such a connection is numerous, it will not be exemplified herein.

Referring to FIG. 4, a second preferred embodiment of the illuminating device of the present invention is similar to the first preferred embodiment, except that the substrate 21 of each of the illuminating modules 2 includes an insulating first layer body 213, a through hole 214 formed in the first layer body 213 and penetrating through the first layer body 213, a conductive body 215 filling the through hole 214, and a surface formed on the first layer body 213 and The second layer body 212 electrically connected to the connector 215. The first layer body 213 is made of an insulating plastic material selected from, for example, polyester, acryl, polycarbonate, etc.; the connecting body 215 is a metal material selected from copper, aluminum, etc., and the second layer body 212 is electrically conductive. It is made of a material having good conductivity such as a metal element, an alloy metal, or a metal oxide.

Preferably, the second layer body 212 is made of molybdenum as a main material and has electrical conductivity.

The electrical connection can also be formed by stacking the connection body 215 of any of the light-emitting modules 2 and connecting it to a predetermined area of the finger-shaped electrode 232 of the electrode unit 23 of another adjacent light-emitting module 2. When the light is emitted, the dark spots formed by the gaps between the two adjacent light-emitting modules 2 are not generated when the light is emitted, and a large-area and uniform surface light can be emitted.

Referring to FIG. 5, it is to be noted that the substrate 21 of any one of the first and second preferred embodiments of the light-emitting device of the present invention is stacked on the substrate 21 of the adjacent light-emitting module 2 The substrate 21 having a thickness smaller than that of the substrate 2 of the same light-emitting module 2 is not stacked on the thickness of the electrode unit 23 of the adjacent light-emitting module 2 (FIG. 5 is an example of the first preferred embodiment). In detail, the substrate 21 stacked on the adjacent electrode unit 23 is thinner than the substrate 21 not stacked on the adjacent electrode unit 23, thereby reducing the overall light-emitting device due to the height of the substrate 21. The problem of the lateral light-shielding problem can further improve the flatness of the light-emitting device as a whole, and the relative position of the thickness difference can be formed through the substrate 21 of any of the light-emitting modules 2 for the overlapping positions of the adjacent light-emitting modules 2 to be defined. More precise.

Referring to FIG. 6 , the light-emitting device of the first and second preferred embodiments of the present invention may further include a light-expanding film 3 disposed on the light-emitting modules 2, such that the light generated by the actuating units 22 passes through the first light. The transparent electrode 231 is further transmitted through the light-expanding film 3 to make the light emit light more uniformly and softly. FIG. 6 is an example of the light-emitting device of the first preferred embodiment shown in FIG. Give instructions. In particular, it is also possible to directly cover the light-emitting modules 2 with a film-like light-expanding film 3, which can also achieve the effect of softening the light source.

In summary, the illuminating device of the present invention utilizes the illuminating modules 2 of the plurality of substrates 21 to be stacked into a dark spot formed by a gap between the large-area and non-light-emitting modules, and can uniformly emit light, and is suitable for application. As a backlight of a display or a large-area illuminating kanban, it is indeed possible to achieve the object of the present invention.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

2‧‧‧Lighting module

2a‧‧‧Lighting module

2b‧‧‧Lighting Module

21‧‧‧Substrate

211‧‧‧ first layer

212‧‧‧Second layer

213‧‧‧ first layer

214‧‧‧Perforation

215‧‧‧Connector

22‧‧‧Operating unit

23‧‧‧Electrode unit

231‧‧‧Transparent electrode

232‧‧‧Finger-shaped electrode

3‧‧‧Expanding film

W‧‧‧Width

1 is a schematic cross-sectional view showing a plurality of light-emitting modules of a light-emitting device having a gap therebetween; FIG. 2 is a perspective view showing a light-emitting module of a first preferred embodiment of the light-emitting device of the present invention; BRIEF DESCRIPTION OF THE DRAWINGS FIG. 4 is a cross-sectional view showing a second preferred embodiment of a light-emitting device of the present invention; FIG. 5 is a cross-sectional view showing the present invention. The thickness of the substrate on which the illuminating device is stacked on the adjacent electrode unit is smaller than the thickness of the substrate which is not stacked on the adjacent electrode unit; and FIG. 6 is a schematic cross-sectional view showing that the illuminating device of the present invention further comprises a light-expanding device membrane.

2. . . Light module

2a. . . Light module

2b. . . Light module

twenty one. . . Substrate

211. . . First layer

212. . . Second layer

twenty two. . . Actuating unit

twenty three. . . Electrode unit

231. . . Transparent electrode

232. . . Finger fork electrode

W. . . width

Claims (5)

A light-emitting device comprising: a plurality of light-emitting modules arranged one above another, each light-emitting module having a power-conducting substrate, an actuating unit disposed on the substrate and generating light by photoelectric effect during power supply, and An electrode unit including a transparent electrode disposed on the actuating unit, and any two adjacent light emitting modules are stacked on a portion of the substrate of one of the light emitting modules in another adjacent light emitting module a portion of the electrode unit is electrically connected to each other, the substrate of each of the light emitting modules includes a first layer body, and a stack is disposed on the first layer body and located between the first layer body and the actuation unit The second layer body, wherein the thickness of the overlapping area of the first layer body and the adjacent light emitting module is smaller than the thickness of the area not overlapped with the adjacent light emitting module, and the iron has a weight percentage of not less than 60%. It is composed of a stainless steel material having a weight percentage of not less than 15% and a nickel content of not less than 8% by weight, and has flexibility. The second layer body is made of a metal material for uniform current diffusion. The illuminating device of the first aspect of the invention, wherein the electrode unit of each of the illuminating modules further comprises a finger-shaped electrode disposed on the surface of the transparent electrode, and any two adjacent illuminating modules are A portion of the substrate of one of the light-emitting modules is in ohmic contact with the finger-shaped electrodes of another adjacent light-emitting module and is electrically connected to each other. The illuminating device according to claim 1, wherein the second layer of the substrate of each of the illuminating modules is made of molybdenum as a main material. According to the illuminating device of claim 1, wherein the illuminating device The thickness of the bright electrode is not less than 0.2 μm. The illuminating device according to claim 1, further comprising a light-expanding film covering the top surface of the illuminating module for uniformly emitting light.