CN209746315U

CN209746315U - Bottom light-emitting backlight source for mobile phone

Info

Publication number: CN209746315U
Application number: CN201920394638.6U
Authority: CN
Inventors: 张小齐; 李琪
Original assignee: Shenzhen Longli Technology Co Ltd
Current assignee: Shenzhen Longli Technology Co Ltd
Priority date: 2019-03-26
Filing date: 2019-03-26
Publication date: 2019-12-06
Anticipated expiration: 2029-03-26

Abstract

The utility model discloses a bottom lighting backlight source for mobile phone, which comprises a rubber frame, a FPC, a LED, a light guide layer, a diffusion layer, a lower light intensifying sheet, an upper light intensifying sheet and a shading rubber, wherein the FPC, the light guide layer, the diffusion layer, the lower light intensifying sheet and the upper light intensifying sheet are arranged in the rubber frame from bottom to top in sequence; the shading glue is adhered to the glue frame and the upper brightening sheet; the LED is attached to the FPC; a perforated reflecting layer with the reflectivity of more than 90 percent is arranged on the surface of the FPC except the LED; and a perforated reflecting layer with the reflectivity larger than 90% is also arranged on the surface of the light guide layer. The utility model discloses novel structure through the foraminiferous reflector layer that sets up high reflectivity on FPC surface and leaded light layer surface, the intensity of guidance light-emitting can be controlled to the size or the density of adjustment hole to make the luminance distribution on whole plain noodles even, the LED quantity that the end backlight used has significantly reduced. In addition, the whole thickness of the bottom backlight source can be controlled within 0.6mm, so that the cost is reduced, and the thickness can be reduced.

Description

Bottom light-emitting backlight source for mobile phone

Technical Field

The utility model relates to a cell-phone backlight field, concretely relates to end luminous backlight for cell-phone.

Background

The backlight source is a light source located at the back of the liquid crystal display, and the light emitting effect of the backlight source directly affects the visual effect of the liquid crystal display module. The existing backlight source of the mobile phone generally adopts a side backlight source. However, side backlights have several drawbacks:

1. Due to the limited battery storage capacity and the demand for slimmer mobile devices, more and more energy efficient screens are required. Conventional LED side backlights have failed to further break through in power consumption. Moreover, as consumers are more and more in the mood of HDR screens, the power consumption of the backlight source is further increased, and high screen contrast cannot be realized;

2. as shown in fig. 1 and 2, in order to increase the screen occupation ratio of the mobile phone screen as much as possible and improve the portability and easy portability of the mobile phone, the conventional side backlight source cannot shorten the black edge of the light source side to below 2.5mm, and the backlight source matched with the COF process module requires that the black edge width is below 1.5mm, which cannot be achieved by the conventional side backlight source;

3. As shown in fig. 3, some components such as the front camera, the speaker, the infrared distance sensor, etc. cannot be removed from the front surface during the full-screen process, which requires a groove or a hole in the backlight. The traditional method of digging holes or grooves on the light guide plate on the side backlight source is difficult to process or even impossible to process.

because the traditional side backlight source has the defects, many mobile phone manufacturers consider using a bottom light emitting source to replace a side light emitting source, and the bottom light emitting backlight source realizes bright and dark display of partial areas by locally controlling the switch of an LED, so that the power consumption of a screen can be greatly reduced, the contrast is improved, and dynamic HDR is realized. The bottom light-emitting backlight source can solve the problem that the black edges on four sides of the side backlight source are too wide, particularly the black edges on the LED side are too wide, and the portability of the mobile phone is improved; in addition, the problem of perforated or grooved light effect which is difficult to process or cannot be processed by the traditional side backlight source can be perfectly solved by applying the bottom backlight source.

However, there are problems with existing bottom-emitting backlights. The bottom backlight source has high cost and poor display effect due to excessive LEDs, and the light emitting surface has LED dot matrix bright spots which cannot be thoroughly eliminated; in addition, other technologies adopt a composite film which is fully distributed with micro-lenses and integrated above the LEDs to solve the problem of LED dot matrix, but the composite film needs the thickness of more than 0.3mm to be effective, the processing is very complex, the cost is very high, and the requirement on the assembly precision is also very high. This approach can reduce the number of LEDs to 1/4, which would not be practical if the process were used alone to a lesser extent.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model provides a bottom lighting backlight source for mobile phone, which can reduce the number of LEDs used by the bottom backlight source by orders of magnitude; in addition, the whole thickness of the backlight source can be controlled within 0.6mm, so that the cost is reduced, and the thickness can be reduced.

The utility model discloses a solve the technical scheme that its problem adopted and be:

the utility model provides a bottom lighting backlight source for cell-phone, is including gluing frame, FPC, LED, leaded light layer, diffusion barrier, lower light enhancement piece, last light enhancement piece and shading glue, wherein:

the FPC, the light guide layer, the diffusion layer, the lower light intensifying sheet and the upper light intensifying sheet are sequentially arranged in the rubber frame from bottom to top;

The shading glue is adhered to the glue frame and the upper brightening sheet;

The LED is attached to the FPC;

a perforated reflecting layer with the reflectivity of more than 90 percent is arranged on the surface of the FPC except the LED;

And a perforated reflecting layer with the reflectivity larger than 90% is also arranged on the surface of the light guide layer.

The utility model provides a bottom light-emitting backlight source for mobile phone, through setting up the reflecting layer of high reflectivity on FPC surface and light guide layer surface, the light that LED produced can reflect back and forth between these two reflecting layers; the light generated by the LED can then be directed out of the surface by opening a hole in the reflective layer; the intensity of the guided light can be controlled by adjusting the size or density of the holes, so that the brightness of the whole light-emitting surface is uniformly distributed; by arranging the diffusion sheet and the upper and lower brightness enhancement sheets on the reflection layer, the guided light can be more uniform, and the front brightness is higher.

Further, the light guide layer is LGP (light guide plate) or LGF (light guide film) or PET (polyethylene terephthalate) or a fluorescent layer.

The light guiding layer functions as a light guiding and a load-bearing reflective layer, and may have a thickness of 0.1mm or less. When the number of the LED lamps is about 1K, the white reflecting film with holes can be used for replacing the light guide layer.

Further, the diffusion layer is a diffusion film or a quantum dot film.

when the diffusion layer is a quantum dot film, encapsulated fluorescent powder can be omitted, so that the encapsulation thickness of the LED chip is reduced.

further, the LEDs are distributed in a matrix array or a hexagonal array.

Further, the LED is a monochromatic blue light chip.

further, the surface of the LED is provided with a protective film.

The protective film is pressed on the surface of the LED chip, so that the function of isolating air and water vapor can be achieved.

Specifically, the thickness of the protective film is 5-10 μm.

Further, the perforated reflecting layer is a white ink reflecting layer or a mirror ink reflecting layer or other perforated reflecting layers with the reflectivity larger than 90%.

further, the perforated reflecting layer is obtained by printing or ink-jet or evaporation coating or UV thermal transfer printing.

Further, the holes on the perforated reflecting layer are circular or oval or other shapes.

Compared with the prior art, the beneficial effects of the utility model are that:

1. The bottom light-emitting backlight source for the mobile phone of the utility model has the advantages that the reflecting layers with high reflectivity are arranged on the surface of the FPC and the surface of the light guide layer, and the light generated by the LED can be reflected back and forth between the two reflecting layers, so that the quantity of the LED used by the surface light source can be reduced in an order of magnitude; light generated by the LED can be directed out of the surface by opening a hole in the reflective layer; the intensity of the guided light can be controlled by adjusting the size or density of the holes, so that the brightness of the whole light-emitting surface is uniformly distributed, the light-emitting effect of the surface light source is improved, and the surface uniformity of the surface light source is improved.

2. the bottom light-emitting backlight source for the mobile phone simplifies the structure of the traditional backlight source by arranging the porous reflecting layer with high reflectivity, so that the design, the manufacturing process, the cost and the like are greatly reduced; in addition, the arrangement mode can realize the surface light source with any shape, thereby greatly reducing the difficulty of optical adjustment of the surface light source.

Drawings

FIG. 1 is a schematic diagram of a black-edge structure of a side backlight;

FIG. 2 is a schematic diagram of a black-edge structure of a COF module;

FIG. 3 is a schematic view of a conventional side backlight light guide plate with holes or grooves;

FIG. 4 is a schematic structural view of a bottom-emitting backlight source for a mobile phone according to the present invention;

FIG. 5 is a schematic view of a perforated white oil reflective layer;

fig. 6 is a schematic structural diagram of the LED in a matrix array or a hexagonal array.

Wherein the reference numerals have the following meanings:

FPC10, LED20, light guide layer 30, diffusion layer 40, lower brightness enhancement film 50, upper brightness enhancement film 60, rubber frame 70, shading rubber 80 and perforated reflection layer 90.

Detailed Description

For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Referring to fig. 4, the utility model discloses a bottom lighting backlight source for mobile phone, which comprises a rubber frame 70, and a FPC10, a light guide layer 30, a diffusion layer 40, a lower light intensifying plate 50 and an upper light intensifying plate 60 which are arranged in the rubber frame 70 from bottom to top in sequence; an LED20 is further mounted on the upper surface of the FPC10, as shown in fig. 6, the LED20 is a monochromatic blue chip and is arranged on the FPC10 in a matrix array or a hexagonal array in a patch manner; in this embodiment, the spacing between adjacent LEDs 20 is 2mm, and for a 6 inch backlight (light emitting region: 68.5:136.6), the number of LEDs 20 required is about 33 × 68 to 2244, which is about 1/4 when the spacing between LEDs 20 is 1 mm. The FPC10 may be 0.08mm or 0.18mm thick as the case may be. After the LED20 is mounted, a protective film is pressed on the surface of the LED20 to protect the LED from air and water vapor. The thickness of the protective film is 5-10 μm.

Referring to fig. 5, a perforated reflective layer 90 having a reflectivity greater than 90% is disposed on both the upper surface of the FPC10 and the upper surface of the light guide layer 30, and preferably, the perforated reflective layer 90 is a perforated white ink reflective layer; in other embodiments, the perforated reflective layer 90 may also be a mirror ink or other material with a high reflectivity greater than 90%. Light generated by the LED20 can reflect back and forth between the two perforated reflective layers 90 and direct light generated by the LED20 out of the surface through the holes in the reflective layers; the intensity of the guided light can be controlled by adjusting the size or density of the holes, so that the brightness of the whole light-emitting surface is uniformly distributed; preferably, the hole is circular, and in other embodiments, the hole may also be oval or other shapes, and the like, which is not limited herein. The perforated reflective layer 90 is obtained by ink-jet printing, and when the reflective layer is made of other materials, it can be obtained by other methods such as printing/evaporation/UV thermal transfer printing. In addition, the light guide layer 30 may be LGP or LGF or PET or a fluorescent layer, mainly functioning as a light-transmitting and light-carrying reflective layer, and may be reduced in thickness to 0.1mm or less. When the light guide layer 30 is a fluorescent layer, the mounted LED20 can be packaged without using fluorescent powder, and only one protective film needs to be added on the surface of the LED chip, so that the function of isolating air and water vapor can be achieved. In the case where the number of the LEDs 20 is 1K or less, a white reflective film having a hole may be used instead of the light guide layer 30, thereby achieving a thinner surface light source thickness.

referring to fig. 3, the perforated reflective layer 90 is further provided with a diffusion layer 40, a lower brightness enhancement film 50 and an upper brightness enhancement film 60, so that the LED light from the LED20 is more uniform and the front brightness is higher. The diffusion layer 40 may be a diffusion film or a quantum dot film. When the diffusion layer adopts the quantum dot film, on the basis of possessing the diffusion function, not only can improve the effect that shows the colour gamut, can also save phosphor powder and the white colloid of encapsulation on LED20 to reduce the encapsulation thickness of LED20 chip. The light shielding glue 80 is also adhered to the glue frame 70 and the upper brightness enhancement film 60.

To sum up, the utility model provides a pair of end-emitting backlight for cell-phone through set up the foraminiferous reflection stratum 90 that the reflectivity is greater than 90% on FPC10 surface and leaded light layer 30 surface, the light that LED20 produced can make a round trip to reflect between these two reflection stratums to LED20 quantity that the face light source that can significantly reduce used can be big with the interval between the LED20 promptly. Light generated by the LED20 can be directed out of the surface by making holes in the reflective layer; the intensity of the guided light can be controlled by adjusting the size or density of the holes, so that the brightness of the whole light-emitting surface is uniformly distributed, the light-emitting effect of the surface light source is improved, and the surface uniformity of the surface light source is improved. In addition, through setting up foraminiferous reflection stratum 90 of high reflectivity, can realize the area source of arbitrary shape, greatly reduced the degree of difficulty of area source optical adjustment for design, manufacturing process and cost all obtain very big reduction.

the technical means disclosed by the scheme of the present invention is not limited to the technical means disclosed by the above embodiments, but also includes the technical scheme formed by the arbitrary combination of the above technical features. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also considered as the protection scope of the present invention.

Claims

1. the utility model provides a mobile phone is with end luminous backlight, its characterized in that, glues frame, FPC, LED, leaded light layer, diffusion barrier, lower light intensifying piece, goes up light intensifying piece and shading glue, wherein:

The shading glue is adhered to the glue frame and the upper brightening sheet;

the LED is attached to the FPC;

2. The bottom-emitting backlight for cellular phones according to claim 1, wherein the light guide layer is LGP or LGF or PET or a fluorescent layer.

3. The bottom-emission backlight for mobile phones according to claim 1, wherein the diffusion layer is a diffusion film or a quantum dot film.

4. The bottom-emitting backlight source for mobile phones of claim 1, wherein the LEDs are distributed in a matrix array or a hexagonal array.

5. The bottom-emission backlight source for mobile phones according to claim 4, wherein the LED is a single-color blue-light chip.

6. the bottom emission backlight for mobile phones according to claim 4, wherein a protective film is provided on a surface of the LED.

7. The backlight for mobile phone bottom emission according to claim 6, wherein the thickness of the protective film is 5 μm to 10 μm.

8. The bottom-emission backlight for mobile phones according to claim 1, wherein the reflective layer with holes is a white ink reflective layer or a mirror ink reflective layer.

9. The bottom-emitting backlight source for mobile phones according to claim 8, wherein the reflective layer with holes is obtained by printing, ink-jet printing, evaporation or UV thermal transfer printing.

10. The bottom-emitting backlight source for mobile phones according to claim 1, wherein the holes in the reflective layer with holes are circular or elliptical.