CN201156543Y

CN201156543Y - Encapsulation construction of LED display unit

Info

Publication number: CN201156543Y
Application number: CNU2008200918564U
Authority: CN
Inventors: 黄少忠
Original assignee: SHENZHEN GENTA LED COMPONENTS CO Ltd
Current assignee: SHENZHEN GENTA LED COMPONENTS CO Ltd
Priority date: 2008-01-24
Filing date: 2008-01-24
Publication date: 2008-11-26
Anticipated expiration: 2018-01-24

Abstract

The utility model provides a package structure of LED display unit, which comprises a casing provided with a plurality of cavities, an inner lining which is positioned on the internal lateral surface of the casing, a circuit board, a pixel unit which is stuck on the front side of the circuit board, an epoxy resin package and a lens. The inner lining is correspondingly equipped with a reflection cup which is embedded in the cavity of the casing, and the inner wall of each reflection cup is the inverted cone shaped reflecting surface; the circuit board is positioned on the bottom surface of the inner lining, each pixel unit on the circuit board is correspondingly positioned in the reflection cup of the inner lining respectively; the epoxy resin package is filled in the cavity of the casing and the reflection cup of the inner lining and solidifies, and the part of the epoxy resin package, which corresponds to each reflection cup, protrudes towards the external part of the casing to be the spherical surface and forms the lens by the integral forming. By setting the lens, the utility model can enable the lightness of the LED display unit to increase more than four times, thereby being suitable for the indoor display screen and semi-outdoor display screen, moreover the lens and the epoxy resin package are formed by the integral forming, the package structure of LED display unit has the advantages of simple and short forming process, low cost and being convenient for the large-scale production.

Description

The led display unit encapsulating structure

Technical field

The utility model relates to led display unit, refers in particular to the led display unit encapsulating structure.

Background technology

The display screen of being made up of led display unit is at shops's signboard, and information shows that the application in fields such as traffic guiding and graphical display more and more widely.At present, the structure of led display unit mainly contains two big classes: module and the integral LED module is made up of the single lamp of LED, wherein each pixel of the LED module of being made up of LED list lamp all is welded on the circuit board by direct insertion LED lamp or SMD LED and forms.Higher by the general brightness of module that direct insertion LED forms, the display screen that is used for open air and semi-outdoor more, not high by the module brightness that SMD LED lamp is formed, be used for indoor display screen more, because the encapsulation of single lamp of LED and SMD LED needs high-end devices, make that this module cost of being made up of single LED lamp is bigger, install also more loaded down with trivial details.

And the integral LED module mainly is made up of led chip, circuit board, epoxy resin and shell, earlier luminescence chip is adhered on the circuit board and again circuit board is placed in the shell, then epoxy resin is potted in the housing, heating at last makes epoxy resin cure finish encapsulation.This led display unit has saved the metallic support of single lamp of LED and SMD LED, has saved the high-temperature soldering operation, has saved a large amount of backs processing cost, has bigger cost advantage.But the general visual angle of integral LED module is big, and brightness is not high, only can be used for indoor display screen at present.

Therefore, how can bring into play the cost advantage of integral LED module, can improve the luminosity of this encapsulating structure again, the range of application that enlarges it is the requirements at the higher level of led display unit encapsulation technology.Industry has also been carried out some improvement, the encapsulating structure of a kind of compact type large power light emitting diode that discloses as No. 200620074152.7, Chinese utility model patent ZL, it is installed on the matrix reflection cavity on the main body substrate, again high-power LED chip is adhered to matrix reflection cavity centre, then a lenticular body sealing cover is being equipped with on the matrix reflection cavity of chip, and cover cap the residence metal lead wire and the high-power LED chip that have, matrix reflection cavity inner surface is coated with the reflector to improve the optical efficiency of getting of high-power LED chip.Though by reflector and cooperating of lens can improving brightness, because lenticular body is that independent component need carry out molded lens operation and mounted lens operation specially, make on production process comparatively loaded down with trivial detailsly, production efficiency is lower, cost increases.

The utility model content

Technical problem to be solved in the utility model is: a kind of led display unit encapsulating structure is provided, and it should keep the cost advantage of integral LED module, can effectively improve the luminosity of display unit again, and production process is simple and direct.

For solving the problems of the technologies described above, the utility model adopts following technical scheme: a kind of led display unit encapsulating structure, comprise case, inner lining body, circuit board, several pixel cells of forming by led chip, epoxy encapsulation body and lens, be provided with several cavitys on the described case equably; Described inner lining body is installed in the case medial surface, and described inner lining body correspondence is provided with the reflector in the cavity that is embedded at case, and each reflector internal face is the reflecting surface of back taper; Described pixel cell adheres to the circuit board front and links to each other with board circuit, back of circuit board is provided with the stitch that links to each other with circuit, described circuit board is installed in the bottom surface of inner lining body, and each pixel cell on the circuit board is placed in the reflector of inner lining body respectively correspondingly; Described epoxy encapsulation body is filled and is solidificated in the reflector of the cavity of described case and inner lining body, circuit board, inner lining body and case are joined together, and the epoxy encapsulation body is sphere and constitute described lens also one-body moldedly to the case outer projection corresponding to the part of each reflector.

Preferably, described lens are the hemisphere shape of projection.

Preferably, described pixel cell is made of at least one LEDs of at least a color.

Preferably, described circuit board front is provided with several pits, and described pixel cell adheres in the described pit.

The beneficial effects of the utility model are: the utility model makes the brightness of the utility model led display unit improve more than 4 times by setting up lens, thereby go in the brightness requirement higher indoor display screen and semi-outdoor display screen, and lens form with the epoxy encapsulation body by integral forming, its forming process is simple and direct, cost is low, is convenient to large-scale production.

Below in conjunction with accompanying drawing the utility model is described in further detail.

Description of drawings

Fig. 1 is the assembled state stereogram of the utility model led display unit encapsulating structure.

Fig. 2 is the end view of the utility model led display unit encapsulating structure.

Fig. 3 is the cutaway view of utility model led display unit encapsulating structure.

Embodiment

As shown in Figure 1 to Figure 3, the utility model provides a kind of led display unit encapsulating structure, comprises case 1, inner lining body 2, circuit board 3, several pixel cells 4 of being made up of led chip, epoxy encapsulation body 5 and lens 6.

Wherein, described case 1 can be injection molded by plastic cement, is generally black, is provided with several cavitys 10 on the described case 1 equably.

Described inner lining body 2 is installed in the medial surface of case 1, and described inner lining body 2 correspondences are provided with the reflector 20 in the cavity 10 that is embedded at case 1, and each reflector 20 internal face is the reflecting surface of back taper.Described inner lining body 2 is preferably white, can strengthen its reflection action.

Described circuit board 3 is installed in the bottom surface of inner lining body 2, and described circuit board 3 fronts are provided with several pits 30, and circuit board 3 back sides are provided with the stitch 31 that links to each other with circuit.And described pixel cell 4 is made of at least one LEDs of at least a color, and pixel cell 4 adheres in several pits 30 in circuit board 3 fronts and with circuit board 3 circuit and links to each other, and when circuit board was installed up on the

inner lining body

2,4 of each pixel cells on the circuit board 3 were placed in respectively in the reflector 20 of inner lining body 2 correspondingly.

Described epoxy encapsulation body 5 is filled and is solidificated in the reflector 20 of the cavity 10 of described case 1 and inner lining body 2, circuit board 3, inner lining body 2 and case 1 are joined together, and epoxy encapsulation body 5 is sphere and constitutes described lens 6 to case 1 outer projection also one-body moldedly corresponding to the part of each reflector 20, promptly, described lens 6 are made of one piece with epoxy encapsulation body 5, can save the operation of special manufacturing and assembling lens like this, simplify production process.Preferably, described lens are the hemisphere shape of projection.

The concrete encapsulation process of the utility model led display unit encapsulating structure is as follows:

At first, pixel cell 4 is adhered to the front of circuit board 3, and be connected with circuit board 3;

Secondly, be adjacent to the front of case 1 with high temperature gummed tape, make the adhesive tape in case 1 front on case 1, become the pit of rule in each cavity 10 with each cavity 10 corresponding die sets on special and the case 1 again, this pit becomes hemisphere, after shaping is finished case 1 face down is put on the aluminium sheet, have on the aluminium sheet and case 1 upper plenum 10 circular hole one to one, positioner makes its contraposition accurate, again the pneumatic shuttle of special sealing is placed on case 1 reverse side, add a small amount of air pressure, adhesive tape pits in each cavity 10 are heaved, at the positive hemisphere that becomes projection of case 1;

Once more, inner lining body 2 is installed in the reverse side of case 1, promptly the medial surface of case 1 for normal operating condition, make the cavity 10 of case 1 chimeric correspondingly with the reflector 20 of inner lining body 2, again circuit board 3 is provided with one of pixel cell 4 and is placed on the inner lining body 2 with facing down, each pixel cell on the circuit board 3 is placed in the reflector 20 of inner lining body 2 correspondingly by the reference column on the case 1;

Then, epoxy resin is inserted in case 1 cavity 10, epoxy resin flows in the formed cavity of hemispherical convex surface of the reflector 20 of inner lining body 2 and the adhesive tape formation on the case 1 by the seam of the periphery of the via hole on the circuit board 3 and circuit board 3 and case 1, the epoxy resin that is heating and curing at last forms the epoxy encapsulation body 5 and the lens 6 that solidify and promptly finishes encapsulation, this moment circuit board 3, case 1, inner lining body 2 becomes one because of the epoxy encapsulation body 5 that solidifies, after tearing adhesive tape, the epoxy resin that solidifies forms transparent hemisphere lens in the hemispherical cavity of the projection of the adhesive tape in the front of case 1, thereby behind the led chip electrified light emitting of pixel cell 4, light after the reflection of the reflecting surface of the reflector 20 of pit on the circuit board 30 and inner lining body 2 again behind lens 6 optically focused in case 1 front brightness can improve greatly.

Claims

1, a kind of led display unit encapsulating structure comprises case, circuit board, several pixel cells of being made up of led chip, epoxy encapsulation body and lens, is provided with several cavitys on the described case equably; Described pixel cell adheres to the circuit board front and links to each other with board circuit, back of circuit board is provided with the stitch that links to each other with circuit, it is characterized in that, described led display unit encapsulating structure also comprises the inner lining body that is installed in the case medial surface, described inner lining body correspondence is provided with the reflector in the cavity that is embedded at case, and each reflector internal face is the reflecting surface of back taper; Described circuit board is installed in the bottom surface of inner lining body, and each pixel cell on the circuit board is placed in the reflector of inner lining body respectively correspondingly; Described epoxy encapsulation body is filled and is solidificated in the reflector of the cavity of described case and inner lining body, described circuit board, inner lining body and case are joined together, and the epoxy encapsulation body is sphere and constitute described lens also one-body moldedly to the case outer projection corresponding to the part of each reflector.

2, led display unit encapsulating structure as claimed in claim 1 is characterized in that: described lens are the hemisphere shape of projection.

3, led display unit encapsulating structure as claimed in claim 1 or 2 is characterized in that: described pixel cell is made of at least one LEDs of at least a color.

4, led display unit encapsulating structure as claimed in claim 1 or 2 is characterized in that: described circuit board front is provided with several pits, and described pixel cell adheres in the described pit.