CN210950884U

CN210950884U - LED flexible light spot-free lamp strip

Info

Publication number: CN210950884U
Application number: CN201922184831.XU
Authority: CN
Inventors: 李忠; 邓启爱; 陈应伟; 汪雨
Original assignee: Shenzhen Liangan Photoelectricity Technology Co ltd
Current assignee: Shenzhen Liangan Technology Co ltd
Priority date: 2019-12-09
Filing date: 2019-12-09
Publication date: 2020-07-07
Anticipated expiration: 2029-12-09

Abstract

The utility model provides a flexible LED light spot-free lamp strip, which comprises a plurality of flexible substrates which are spliced and connected; the flexible substrate comprises a positive main line, a negative main line, an LED chip strip and a buffer protection strip, wherein the positive main line and the negative main line are arranged on two sides of the flexible substrate, the LED chip strip is arranged in the middle of the flexible substrate, and the positive main line and the negative main line are connected to the LED chip strip through the buffer protection strip. The utility model discloses can make the flexible no light spot lamp area of LED can be when horizontal or spiral distortion still guarantee under the effect of buffering boundary belt that LED chip area can not destroyed, and then effectively improved the life and the reliable performance of product, on this basis, still through the filling of inorganic layer and the design such as the positive back of flexible base plate, further improved its humanized degree of design, increased electrically conductive area and heat radiating area, reduced the lamp area pressure drop.

Description

LED flexible light spot-free lamp strip

Technical Field

The utility model relates to a LED lamp area especially relates to a flexible no light spot lamp area of LED.

Background

LEDs are widely used as fourth generation green illumination sources. The conventional package achieves the light source effect mainly in the following ways: firstly, adopt SMT intensive arrangement after traditional SMD LED encapsulation, it is huge to use lamp pearl quantity, and technology is complicated, and is with high costs: after the SMD support is bonded by the metal wire, the SMD support has strong water absorption and poor bonding property with the metal, and the bonding wire can be broken due to the fact that the expansion coefficients of the packaging colloid and the metal wire are different in the using process of a product; meanwhile, the silver coating layer at the bottom has the failure risk of reacting with halogen; second, adopt and put into the aluminium groove with linear lamp area, cover the diffuser plate with light diffusion even, but this kind of product size needs prefabrication, installs complicacy, with high costs, the flexibility is not high. Although there is also the LED strip that realizes through the flexible circuit board at present, the degree of bendability of flexible circuit board is very limited, especially when horizontal or spiral distortion, can destroy the validity in LED strip, leads to the lamp area to become invalid, influences life and the reliable performance etc. of product.

Disclosure of Invention

The utility model aims to solve the technical problem that what need provide is the flexible no light spot lamp area of LED that can improve the life and the reliability performance of product to further improve its production efficiency and humanized design degree.

In view of the above, the utility model provides a flexible light spot-free LED lamp strip, which comprises a plurality of flexible substrates, wherein the flexible substrates are connected in an assembling manner; the flexible substrate comprises a positive main line, a negative main line, an LED chip strip and a buffer protection strip, wherein the positive main line and the negative main line are arranged on two sides of the flexible substrate, the LED chip strip is arranged in the middle of the flexible substrate, and the positive main line and the negative main line are connected to the LED chip strip through the buffer protection strip.

The utility model discloses a further improvement lies in, the width of buffering boundary belt is 0.1~0.5 mm.

The utility model discloses a further improvement lies in, the intussuseption of buffering boundary belt is filled and is provided with inorganic material layer.

The utility model discloses a further improvement lies in, anodal main line and negative pole main line all set up in the front and the back of flexible substrate, be provided with the counter bore that is used for realizing the electricity and connects between the front of flexible substrate and the back.

The utility model discloses a further improvement lies in, the LED chip is taken including a plurality of LED flip-chip, LED flip-chip respectively with anodal main line and negative pole main line electricity are connected.

The utility model discloses a further improvement lies in, LED chip area still includes anodal pad and negative pole pad, LED flip chip passes through anodal pad electricity is connected to anodal main line, LED flip chip passes through negative pole pad electricity is connected to the negative pole main line.

The utility model discloses a further improvement lies in, LED chip area still includes current-limiting resistor, LED flip chip pass through current-limiting resistor with anodal main line and negative pole main line electricity are connected.

The utility model discloses a further improvement lies in, flexible substrate is the flexible substrate of prefabricated electric line, LED flip chip with the welding of prefabricated electric line is in the same place.

The utility model discloses a further improvement lies in, it glues to cover the encapsulation on the flexible substrate, the encapsulation is glued and is provided with the phosphor powder particle in.

The utility model discloses a further improvement lies in, the thickness that the encapsulation was glued is for being higher than the chip 0.3~4mm in LED chip area.

Compared with the prior art, the beneficial effects of the utility model reside in that: the LED chip belt is arranged in the middle of the flexible substrate, the flexible substrates are assembled and connected, the positive main circuit and the negative main circuit are connected to the LED chip belt through the buffering protective belt, the arrangement enables the LED flexible non-light spot lamp belt to be capable of being horizontally or spirally twisted, the LED chip belt is still guaranteed not to be damaged under the effect of the buffering protective belt, the service life and the reliability of a product are effectively prolonged, on the basis, the humanized design degree is further improved through filling of an inorganic matter layer and design of the front surface and the back surface of the flexible substrate, the conductive area and the heat dissipation area are increased, the lamp belt pressure drop is reduced, the structure of the product is simplified, and the product performance and the production efficiency are improved.

Drawings

Fig. 1 is a schematic front structural view of a flexible substrate according to an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of A in FIG. 1;

fig. 3 is a schematic cross-sectional view of an embodiment of the present invention;

fig. 4 is a schematic back structural diagram of a flexible substrate according to an embodiment of the present invention.

Detailed Description

Preferred embodiments of the present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1 to 4, the present example provides an LED flexible light-spot-free strip, which includes a plurality of flexible substrates, wherein the flexible substrates are connected in an assembled manner; the flexible substrate comprises a positive main line 1, a negative main line 2, an LED chip belt 3 and a buffer protection belt 4, wherein the positive main line 1 and the negative main line 2 are arranged on two sides of the flexible substrate, the LED chip belt 3 is arranged in the middle of the flexible substrate, the positive main line 1 and the negative main line 2 are all connected to the LED chip belt 3 through the buffer protection belt 4.

In the figure 1, one section of the complete flexible LED non-light spot lamp strip is shown, and in practical application, the complete flexible LED non-light spot lamp strip can be realized by splicing and connecting a plurality of flexible substrates; the positive main line 1 in this example refers to a positive main line arranged on one side of the flexible substrate, and is preferably arranged in a strip shape; the negative main line 2 refers to a negative main line arranged on the other side of the flexible substrate, and is preferably arranged in a strip shape, so that the positive and negative electrodes of the LED flexible light spot-free lamp strip are realized, and the LED flexible light spot-free lamp strip is also called as a positive conducting plate and a negative conducting plate; the LED chip strip 3 refers to a strip main body for arranging an LED flip chip 6 and main components; the buffer protective tape 4 is a buffer tape-like member provided between the positive electrode main line 1 and the buffer protective tape 4 and between the negative electrode main line 2 and the buffer protective tape 4, and may be a groove-shaped protective tape, a protective tape filled with an inorganic substance, or the like.

The carrier of the flexible substrate is preferably provided with a prefabricated circuit, a plurality of LED flip chips 6 and a plurality of layers of circuits for electrical connection and heat dissipation; be equipped with a plurality of pairs of circuit node in the circuit layer, every is connected with flip chip's the N utmost point and the P utmost point respectively to circuit node, adopt the high thixotropic effect and have the shaping of certain mobile silica gel on the LED flip chip 6 that the annular was arranged and is practised, every LED flip chip 6 adopts high accuracy tin alloy (particle diameter < 12 microns) to be fixed in on the prefabricated circuit.

It is worth mentioning that the existing LED strip (also called LED lamp string or LED lamp strip) is also realized by a flexible circuit board, but the existing LED strip is very limited in bending degree, and especially when the existing LED strip is horizontally or spirally twisted, the effectiveness of the LED strip is damaged, so that the strip fails, and the service life and the reliability of the product are affected.

Different from the prior art, this example is in between positive pole main line 1 and buffering boundary belt 4, and the buffering boundary belt 4 that sets up between negative pole main line 2 and the buffering boundary belt 4 makes flexible facula-free lamp area of LED can reduce through the deformation of buffering boundary belt 4 when horizontal or spiral distortion the atress and the dynamics of dragging of LED chip area 3, and then can prevent when external force distortion effect LED chip area 3 from appearing inefficacy, can also play insulating, withstand voltage and shock resistance effect simultaneously, and then can protect LED chip area 3 avoids the product to suffer destruction or inefficacy, effectively improves the life and the reliable performance of product.

Preferably, the width of the buffer protection belt 4 is 0.1-0.5 mm. The width of the buffer protection band 4 refers to the distance between the positive electrode main line 1 and the buffer protection band 4, and the distance between the negative electrode main line 2 and the buffer protection band 4; it should be noted that the width of the buffer protection tape 4 is not freely settable, and if it is set too narrow, the protection effect on the LED chip tape 3 cannot be achieved; if the width is too wide, the conductivity and the product volume of the buffer protective tape can not well meet the requirements of practical application, the width of the buffer protective tape 4 is limited to 0.1-0.5 mm, the required buffer protection effect can be well met, and meanwhile, the conductivity and the product volume cannot be influenced. The buffer protective tape 4 of the present embodiment is preferably filled with an inorganic material layer, and the inorganic material layer can be filled to provide good buffer protection and further improve the stability and reliability of the product.

As shown in fig. 2 to 4, in this example, the positive electrode main line 1 and the negative electrode main line 2 are both disposed on the front surface and the back surface of the flexible substrate, and a counterbore 5 for electrical connection is disposed between the front surface and the back surface of the flexible substrate. That is, unlike the design of the present flexible circuit board, the positive electrode main line 1 and the negative electrode main line 2 are provided on the front surface of the flexible substrate, the back surface of the flexible substrate is also provided with the anode main circuit 1 and the cathode main circuit 2, the anode main circuit 1 and the cathode main circuit 2 on the front surface are electrically connected with the anode main circuit 1 and the cathode main circuit 2 on the back surface through the counter bore 5, the design has the advantages that under the use environment that the size and the cost of the product are limited (the LED flexible light-spot-free lamp belt is smaller in practical application), the conductive area and the heat dissipation area of the positive electrode and the negative electrode can be increased as much as possible, the heat dissipation effect is further improved, the wire resistance is effectively reduced, in addition, even if the flexible substrate is long in assembly length, the pressure drop can be ensured to be small enough, and the light emitting uniformity of the LED flexible non-spot lamp strip cannot be influenced.

It should be mentioned that, in the LED strip in the prior art, when the length of the assembly is too long, the voltage drop (for example, the voltage drop between the front LED strip and the rear LED strip) is very obvious, and the light emitting effect is further affected, in this example, the positive main circuit 1 and the negative main circuit 2 are respectively disposed on the front surface and the back surface of the flexible substrate, and the counter bores 5 electrically connected to the front surface and the back surface of the flexible substrate are disposed, so that the problem can be well solved, and the heat dissipation effect is good, and the wire resistance is small.

In the embodiment, the carrier of the flexible substrate is provided with front and back line conductors (a positive electrode main line 1 and a negative electrode main line 2), the two line conductors are preferably filled with inorganic matters to serve as buffers, and is provided with a through counter bore 5 for realizing electric connection, a plurality of LED chip belts 3, and an LED chip group is arranged on the LED chip belts 3, as shown in fig. 1, the LED chip groups include a plurality of LED flip chips 6, a first LED flip chip 6 and a last LED flip chip 6 of each LED chip group are electrically connected to the positive main line 1 and the negative main line 2 respectively, and realize electric connection between each LED flip chip 6 in the same LED chipset, the LED flip chip 6 at each LED chipset both ends is connected the adhesive tape layer (transparent adhesive tape layer) with the circuit conductor of carrier respectively, the adhesive tape layer cladding is in the carrier with the periphery of LED chipset.

As shown in fig. 1 and fig. 2, the LED chip strip 3 of this embodiment includes a current limiting resistor 9 and a plurality of LED flip chips 6, the LED flip chips 6 are electrically connected to the positive main line 1 and the negative main line 2, respectively, and the LED flip chips 6 are preferably electrically connected to the positive main line 1 and the negative main line 2 through the current limiting resistor 9, so as to achieve a current limiting protection effect. As shown in fig. 3, the LED chip strip 3 further includes a positive pad 7 and a negative pad 8, the positive pad 7 is a positive pad of the LED flip-chip 6, the negative pad 8 is a negative pad of the LED flip-chip 6, the first LED flip-chip 6 and the last LED flip-chip 6 of each LED chip set are electrically connected to the positive main line 1 and the negative main line 2, and the LED flip-chips 6 in the same LED chip set are electrically connected in sequence, that is, the LED flip-chips 6 are electrically connected to the positive main line 1 through the positive pad 7, and the LED flip-chips 6 are electrically connected to the negative main line 2 through the negative pad 8.

The flexible substrate is a flexible substrate of a prefabricated circuit, the LED flip chip 6 is welded with the prefabricated circuit, and the LED flip chip 6 is preferably welded by reflow soldering with tin alloy (the grain diameter is less than 12 um) welding materials. That is to say, the LED chipset of this example uses the mode of prefabricated circuit to connect, has improved the stability and the fastness of connecting, and the packaging adhesive adopts the high thixotropic effect and has the continuous integrated into one piece's of silica gel rectangular shape of certain mobility, the luminous wholeness that possesses of the flexible no facula lamp area of LED, no facula, overall structure is even pleasing to the eye, and the preparation is convenient, and LED flip chip 6 is adopted to this example, and no gold thread design has avoided because of the influence of the expansion of packaging adhesive when cold and hot change to product reliability, and probably the performance is high.

Because what adopt is LED flip chip 6, LED flip chip 6's electrode orientation is down, can the lug connection on prefabricated circuit board, has avoided the gold thread welding, has reduced production facility's input, just electric conduction area and heat conduction area increase between LED flip chip 6 and the carrier of flexible substrate (anodal main circuit 1 and negative pole main circuit 2 all set up in the front and the back of flexible substrate) are favorable to improving heat conduction efficiency and radiating effect, reduce LED chip light decay, increase of service life to effectively reduce the pressure drop. Just the utility model discloses an integral packaging structure has reduced the production technology of encapsulating LED lamp pearl into with LED chip list earlier, has reduced manufacturing cost, makes the manufacture craft of whole LED lamp strip simpler.

The LED chip set in this embodiment includes a plurality of LED flip chips 6, and the circuits of the plurality of circuit units of the LED chip set may be connected in series, or connected in parallel, or connected in series and parallel, and may be adjusted and designed according to actual needs.

In the embodiment, the flexible substrate is covered with packaging adhesive, fluorescent powder particles are arranged in the packaging adhesive, the packaging adhesive preferably adopts high-thixotropy silica gel mixed with the fluorescent powder particles, and completely covers the periphery of the LED flip chip 6 in a continuous adhesive discharging mode; the thickness of the packaging adhesive is preferably 0.3-4 mm higher than that of the chip of the LED chip strip 3, and it is worth explaining that the packaging is realized by dispensing, the thickness of the packaging adhesive is not freely set or valued, the thickness of the packaging adhesive is limited to be 0.3-4 mm higher than that of the chip of the LED chip strip 3 in the embodiment, the purpose is to change the light-emitting angle of a product to be kept within the range of 100-170 degrees by adjusting the thickness of the packaging adhesive, and good light-emitting uniformity and no light spot effect are ensured.

In summary, in the present embodiment, the LED chip belts 3 are disposed in the middle of the flexible substrates, the flexible substrates are connected in an assembled manner, and the positive main circuit 1 and the negative main circuit 2 are both connected to the LED chip belts 3 through the buffer protection belt 4, so that the LED flexible non-speckle lamp belt can still ensure that the LED chip belts 3 cannot be damaged under the action of the buffer protection belt 4 when the LED flexible non-speckle lamp belt is horizontally or spirally twisted, thereby effectively improving the service life and reliability of the product.

The above-mentioned embodiments are the preferred embodiments of the present invention, and the scope of the present invention is not limited to the above-mentioned embodiments, and the scope of the present invention includes and is not limited to the above-mentioned embodiments, and all equivalent changes made according to the shape and structure of the present invention are within the protection scope of the present invention.

Claims

1. The LED flexible non-light spot lamp strip is characterized by comprising a plurality of flexible substrates, wherein the flexible substrates are connected in an assembling manner; the flexible substrate comprises a positive main line, a negative main line, an LED chip strip and a buffer protection strip, wherein the positive main line and the negative main line are arranged on two sides of the flexible substrate, the LED chip strip is arranged in the middle of the flexible substrate, and the positive main line and the negative main line are connected to the LED chip strip through the buffer protection strip.

2. The LED flexible non-spot light strip according to claim 1, wherein the width of the buffer protection strip is 0.1-0.5 mm.

3. The LED flexible non-speckle light strip of claim 1, wherein the buffer protective tape is filled with an inorganic layer.

4. The LED flexible non-speckle light strip according to any one of claims 1 to 3, wherein the positive main circuit and the negative main circuit are both arranged on the front surface and the back surface of the flexible substrate, and a counter bore for realizing electrical connection is arranged between the front surface and the back surface of the flexible substrate.

5. The LED flexible non-speckle light strip of any one of claims 1 to 3, comprising a plurality of LED flip chips on the LED chip strip, the LED flip chips being electrically connected to the positive and negative main lines, respectively.

6. The LED flexible non-spot light strip according to claim 5, wherein said LED chip strip further comprises a positive electrode pad through which said LED flip chip is electrically connected to said positive electrode main line and a negative electrode pad through which said LED flip chip is electrically connected to said negative electrode main line.

7. The LED flexible non-speckle light strip of claim 5, wherein the LED chip strip further comprises a current limiting resistor, and the LED flip chip is electrically connected to the positive and negative main lines through the current limiting resistor.

8. The LED flexible non-speckle light strip of claim 5, wherein the flexible substrate is a flexible substrate of a pre-fabricated electrical circuit to which the LED flip chip is soldered.

9. The LED flexible non-speckle light strip according to any one of claims 1 to 3, wherein the flexible substrate is covered with an encapsulation adhesive, and phosphor particles are disposed in the encapsulation adhesive.

10. The LED flexible non-spot light strip according to claim 9, wherein the thickness of the packaging adhesive is 0.3-4 mm higher than the thickness of the chip of the LED chip strip.