CN210442602U

CN210442602U - Backlight module of automobile instrument

Info

Publication number: CN210442602U
Application number: CN201921529230.1U
Authority: CN
Inventors: 刘三妹; 姚志图; 罗增昌; 刘启玉; 彭环洋
Original assignee: HUIZHOU WAI CHI ELECTRONICS Ltd
Current assignee: HUIZHOU WAI CHI ELECTRONICS Ltd
Priority date: 2019-09-13
Filing date: 2019-09-13
Publication date: 2020-05-01
Anticipated expiration: 2029-09-13

Abstract

An automobile instrument backlight module, comprising: the LED light source comprises a rubber frame, an arc-shaped light guide plate, perforated silica gel, a light guide assembly, an LED lamp group and a flexible circuit board, wherein the rubber frame is arc-shaped, a bottom plate is arranged in the rubber frame, the arc-shaped light guide plate is arranged on the bottom plate, the light guide assembly is arranged on the arc-shaped light guide plate, a perforation is arranged between two arc surfaces of the arc-shaped light guide plate, the bottom plate and the light guide assembly are correspondingly provided with perforations at the same position, the perforated silica gel is a hollow cylinder, one end of the perforated silica gel is provided with a first annular bulge structure and a second annular bulge structure, the perforated silica gel is connected and fixed with the bottom plate in the perforation through the first annular bulge structure and the second annular bulge structure, the two ends of the LED lamp group are provided with stop posts, the two ends of the straight side of the arc-shaped light guide plate are abutted against, improve the luminous effect at the perforation.

Description

Backlight module of automobile instrument

Technical Field

The utility model relates to a liquid crystal display technology field, in particular to motormeter backlight unit.

Background

At present, LED backlight technique is because its long service life, the low power dissipation, the wide application is in the interior instrument illumination of car, common backlight unit is all through the flexible circuit board at the single face of light guide plate or two-sided fixed welding good LED, when the light beam that LED sent passes through sawtooth reticulation and the cylinder site on the light guide plate, can evenly distributed on the light guide plate, but this kind of mode is only applicable to the comparatively conventional backlight structure of structural shape, when this kind of structure is the dysmorphism comparatively complicated in the face of motormeter, because do the perforation structure in the middle of two cambered surfaces of light guide plate, bad phenomena such as light leak and light line appear around the perforation, there is very big influence to whole luminous region, be difficult to reach ideal display effect.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that solve is because doing the perforation structure in the middle of two cambered surfaces of light guide plate, appears bad phenomena such as light leak and bright line around the fenestrate, consequently, provides an motormeter backlight unit.

The utility model provides an above-mentioned technical problem's technical scheme as follows: an automobile instrument backlight module, comprising: the LED lamp comprises a rubber frame, an arc-shaped light guide plate, perforated silica gel, a light guide assembly, an LED lamp group and a flexible circuit board, wherein the rubber frame is arc-shaped, a bottom plate is arranged in the rubber frame, the arc-shaped light guide plate is arranged on the bottom plate, the light guide assembly is arranged on the arc-shaped light guide plate, a perforation is arranged between two arc surfaces of the arc-shaped light guide plate, the bottom plate and the light guide assembly are correspondingly provided with perforations at the same position, the perforated silica gel is a hollow cylinder, one end of the perforated silica gel is provided with a first annular bulge structure and a second annular bulge structure, the perforated silica gel is connected and fixed with the bottom plate through the first annular bulge structure and the second annular bulge structure, the two ends of the LED lamp group are provided with stop posts, the two straight ends of the arc-shaped light guide plate are abutted against the stop posts, and the, and the flexible circuit board is electrically connected with the flexible circuit board, and the flexible circuit board is arranged on the bottom plate.

Further, the light guide assembly comprises a light-diffusing film, a lower light-adding sheet, an upper light-adding sheet and a reflective film, the light-diffusing film, the lower light-adding sheet and the upper light-adding sheet are sequentially attached to the front surface of the arc-shaped light guide plate, and the reflective film is attached to the back surface of the arc-shaped light guide plate.

Further, the arc side of arc light guide plate is provided with location silica gel, the bottom plate lateral wall be provided with the recess of location silica gel size looks adaptation, the arc light guide plate with the bottom plate passes through location silica gel fixed connection.

Furthermore, a diaphragm positioning and assembling boss is arranged in the middle of the straight side of the arc-shaped light guide plate, a first notch matched with the diaphragm positioning and assembling boss is arranged in the middle of the straight side of the light-diffusing film, the lower light-adding sheet and the upper light-adding sheet, and the diaphragm positioning and assembling boss is embedded with the first notch.

Furthermore, the side walls of the two arc-shaped joints of the bottom plate are provided with second notches, the light-diffusing film, the lower light-adding sheet and the upper light-adding sheet are provided with matched convex parts at the two arc-shaped joints, and the convex parts are embedded with the second notches.

Further, the perforated silica gel surface is provided with an embossed surface.

Furthermore, a circular ring single-sided adhesive is pasted around the perforation of the light-diffusing film.

Furthermore, the rubber frame is provided with foam rubber.

The utility model has the advantages that: the utility model provides a motormeter backlight module, when being used for the interior instrument illumination of car, the light beam that LED banks sent can evenly distribute when passing through on the arc light guide plate, partly spread along the direction of perpendicular to arc light guide plate face, another part spread to arc light guide plate face direction, pass through during the perforation, because the perforated silica gel is hollow cylinder, perforated silica gel one end is provided with first annular bulge structure and second annular bulge structure, the perforated silica gel passes through first annular bulge structure and second annular bulge structure and is connected with the bottom plate, fixes in the perforation, can solve the condition of perforation light leak, improves the luminous effect around the perforation, simultaneously, the position stopping post is through fixing arc light guide plate with the light guide subassembly, the arc light guide plate and the perforation of the light guide assembly are positioned in the same vertical direction, so that displacement light leakage at the perforation can be avoided, an even surface light source is provided for a display, and an ideal display effect is achieved.

Drawings

FIG. 1 is a schematic diagram illustrating an exploded structure of an entire backlight module of an automobile instrument according to an embodiment;

FIG. 2 is a schematic view of a partial structure of a backlight module of an automobile instrument according to an embodiment;

fig. 3 is a schematic structural diagram of an automobile instrument backlight module according to an embodiment.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The following will combine the drawings of the embodiments of the present invention to further describe the technical solution of the present invention, and the present invention is not limited to the following specific embodiments.

It should be understood that the same or similar reference numerals in the drawings of the embodiments correspond to the same or similar parts. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the drawings, the description is merely for convenience of description and simplicity of description, but does not indicate or imply that the equipment or components referred to must have specific orientations, be constructed in specific orientations, and be operated, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limitations of the present patent, and those skilled in the art will understand the specific meanings of the terms according to specific situations.

As shown in fig. 1, in one embodiment, an automobile instrument backlight module includes: the LED light source comprises a rubber frame 100, an arc-shaped light guide plate 500, perforated silica gel 700, a light guide assembly, an LED lamp group 900 and a flexible circuit board 1000, wherein the rubber frame 100 is arc-shaped, a bottom plate 110 is arranged in the rubber frame 100, the arc-shaped light guide plate 500 is arranged on the bottom plate 110, the light guide assembly is arranged on the arc-shaped light guide plate 500, a perforation 510 is arranged between two arc surfaces of the arc-shaped light guide plate 500, the bottom plate 110 and the light guide assembly are correspondingly provided with perforations 510 at the same position, the perforated silica gel 700 is a hollow cylinder, one end of the perforated silica gel 700 is provided with a first annular bulge 710 structure and a second annular bulge 720 structure, the perforated silica gel 700 is connected and fixed in the perforation 510 through the first annular bulge 710 structure and the second annular bulge 720 structure with the bottom plate 110, stop columns 800 are arranged at two ends of the LED lamp group 900, two ends of the straight edge side of the, the LED lamp set 900 is disposed on the flexible circuit board 1000, and is electrically connected to the flexible circuit board 1000, and the flexible circuit board 1000 is disposed on the bottom plate 110. Specifically, the rubber frame 100 is provided with foam rubber 120, the foam rubber 120 is attached to the surface of the rubber frame 100 by three-section closed splicing, so as to provide buffering and dustproof effects for the backlight module, the side wall of the bottom plate 110 is provided with a notch, the side wall of the rubber frame 100 is correspondingly provided with a protrusion for limiting assembly, the rubber frame 100 is embedded with the bottom plate 110, so that the arc-shaped light guide plate 500 and the light guide assembly are clamped between the rubber frame 100, the size of the perforated silica gel 700 is matched with the perforation 510, the first annular protrusion 710 structure and the second annular protrusion 720 structure of the perforated silica gel 700 are combined with the perforation 510 of the bottom plate 110, so that one end of the perforated silica gel 700 is connected with the bottom plate 110 to be fixed in the perforation 510, and the cylindrical part of the perforated silica gel 700 is closely attached to the arc-shaped light guide plate 500 and the perforation 510 of the light guide assembly, the glue rack 100 is divided into an arc edge and a straight edge, the LED lamp group 900 is attached to the straight edge side wall of the bottom plate 110 through heat conducting glue, the stop columns 800 are welded at two ends of the LED lamp group 900, wherein the height of the stop columns 800 is larger than that of the LED lamp group 900, the part of the stop columns 800 which is higher than the LED lamp group can be propped against the arc-shaped light guide plate 500, so that the distance between the LED lamp group 900 and the arc-shaped light guide plate 500 can be controlled, the LED lamp group 900 is prevented from being damaged by collision, the arc-shaped light guide plate 500 and a light guide assembly on the arc-shaped light guide plate 500 can be fixed, and the flexible circuit board 1000 is fixed on the bottom plate 110 through a fixing adhesive tape.

In one embodiment, in each structure of the embodiment, the light guide assembly includes a light diffusing film 400, a lower light intensifying sheet 300, an upper light intensifying sheet 200, and a reflective film 600, the light diffusing film 400, the lower light intensifying sheet 300, and the upper light intensifying sheet 200 are sequentially attached to the front surface of the arc light guide plate 500, and the reflective film 600 is attached to the back surface of the arc light guide plate 500. Specifically, the membrane 400 that loosens the light with add lustre to down the membrane with go up lustre to piece 200 and can fix through fixed diaphragm double faced adhesive tape the membrane 400 that loosens the light with add lustre to down the membrane with go up 200 membranes, reflective membrane 600 is fixed through fixed diaphragm double faced adhesive tape the back of arc light guide plate 500, the subsides of arc limit lateral wall of arc light guide plate 500 have strip reflective membrane 440, can prevent the outer hourglass of light, improve the luminance of 500 arc summits of arc light guide plate.

In one embodiment, in one or more embodiments, a circular ring of single-sided adhesive 410 is attached around the through hole 510 of the light-diffusing film 400. Specifically, two membrane 400 that diffuses post ring black single-sided adhesive 410 around perforation 510, can prevent perforation 510 department light leak improves the luminous effect around perforation 510 department, membrane 400 that diffuses will the gentle scattering of light that arc light guide plate 500 received promotes backlight unit's light luminance, provides an even area source for the display to play the effect of widening the visual angle, reach ideal display effect.

In an implementation manner of the embodiment of the present application, when the backlight module for automobile instrument is used for illuminating the instrument in the automobile, the light beam emitted by the LED lamp set 900 passes through the sawteeth and the dots on the arc light guide plate 500, and is uniformly distributed on the arc light guide plate 500, one part of the light beam is transmitted out along the direction perpendicular to the surface of the arc light guide plate 500, and the other part of the light beam is transmitted out along the surface of the arc light guide plate 500, and passes through the through hole 510, because the perforated silica gel 700 is a hollow cylinder, one end of the perforated silica gel 700 is provided with the first annular protrusion 710 structure and the second annular protrusion 720 structure, the perforated silica gel 700 is connected with the bottom plate 110 through the first annular protrusion 710 structure and the second annular protrusion 720 structure, and is fixed in the through hole 510, so as to solve the situation of insufficient brightness at the through hole 510, improve the luminous effect around perforation 510 department, simultaneously, the position post 800 is through fixing arc light guide plate 500 with the light guide component makes arc light guide plate 500 with the light guide component perforation 510 is located same vertical direction, avoids perforation 510 shifts, two membrane 400 of dispersing circular ring single-sided adhesive 410 is pasted around perforation 510, can prevent perforation 510 department light leak, provides an even area source for the display, reaches ideal display effect.

In one embodiment, on the basis of each structure of the first embodiment, positioning silica gel 520 is disposed around the arc light guide plate 500, a groove with a size matched with that of the positioning silica gel 520 is disposed on a side wall of the bottom plate 110, and the arc light guide plate 500 is fixedly connected to the bottom plate 110 through the positioning silica gel 520. Specifically, be provided with 4 on two arc lateral walls of arc light guide plate 500 and have location silica gel 520, location silica gel 520 side with arc light guide plate 500 lateral wall parallel and level, the bottom plate 110 lateral wall be provided with in relevant position with the recess of location silica gel 520 size looks adaptation, location silica gel 520 one side is located in the recess, the opposite side of location silica gel 520 with arc light guide plate 500 connects, the thickness of location silica gel 520 is greater than the thickness of recess on the bottom plate 110, location silica gel 520 plays the extrusion arc light guide plate 500's effect, thereby arc light guide plate 500 fixed connection be in the bottom plate 110.

As shown in fig. 2, in one embodiment, on the basis of the structures of the first embodiment, a film positioning and assembling boss 530 is disposed in the middle of the straight side of the arc light guide plate 500, a first notch 420 matched with the film positioning and assembling boss 530 is disposed in the middle of the straight side of the light diffusing film 400, the lower light adding sheet 300, and the upper light adding sheet 200, and the film positioning and assembling boss 530 is engaged with the first notch 420. Specifically, the light-diffusing film 400, the lower light-adding sheet 300 and the upper light-adding sheet 200 are fixed on the arc-shaped light guide plate 500 at the straight edge sides by the film positioning and assembling boss 530 and the first notch 420 in an embedded manner, so that the films are bonded more firmly, and the light leakage caused by the displacement of the films is avoided.

In one embodiment, as shown in fig. 3, on the basis of the above-mentioned structure, the bottom plate 110 has two curved connecting portions and two side walls thereof are provided with second notches 130, and the light diffusing film 400, the lower light-adding sheet 300 and the upper light-adding sheet 200 have two curved connecting portions and matched protrusions 430, wherein the protrusions 430 are engaged with the second notches 130. Specifically, the light-diffusing film 400, the lower light-adding sheet 300 and the arc-shaped side of the upper light-adding sheet 200 are embedded and fixed on the arc-shaped light guide plate 500 through the protruding part 430 and the second notch 130, after the three layers of membranes are fixed in pairs through the fixed membrane double-sided adhesive, the upper light-adding sheet 200 is finally adhered by the fixed membrane single-sided adhesive and is bent and wrapped on the side walls of the two arc-shaped joints of the bottom plate 110, so that the membranes are further fixed on the arc-shaped light guide plate 500, the attachment between the membranes is firmer, and the condition that the light leakage is caused by the displacement of the membranes is avoided.

In one embodiment, in each of the structures of the embodiment, the surface of the perforated silicone gel 700 is provided with an embossed surface. Specifically, the perforated silicone rubber 700 is black, and the surface is an embossed surface, so that light gathering can be improved, and a large difference between the brightness of the perforated hole 510 and the brightness of other light-emitting areas can be avoided, so that the brightness of the perforated hole 510 of the arc-shaped light guide plate 500 is maintained, and an ideal display effect is achieved.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The utility model provides an automobile instrument backlight unit which characterized in that includes: the LED lamp comprises a rubber frame, an arc-shaped light guide plate, perforated silica gel, a light guide assembly, an LED lamp group and a flexible circuit board, wherein the rubber frame is arc-shaped, a bottom plate is arranged in the rubber frame, the arc-shaped light guide plate is arranged on the bottom plate, the light guide assembly is arranged on the arc-shaped light guide plate, a perforation is arranged between two arc surfaces of the arc-shaped light guide plate, the bottom plate and the light guide assembly are correspondingly provided with perforations at the same position, the perforated silica gel is a hollow cylinder, one end of the perforated silica gel is provided with a first annular bulge structure and a second annular bulge structure, the perforated silica gel is connected and fixed with the bottom plate through the first annular bulge structure and the second annular bulge structure, the two ends of the LED lamp group are provided with stop posts, the two straight ends of the arc-shaped light guide plate are abutted against the stop posts, and the, and the flexible circuit board is electrically connected with the flexible circuit board, and the flexible circuit board is arranged on the bottom plate.

2. The backlight module of claim 1, wherein the light guide assembly comprises a light-diffusing film, a lower light-intensifying sheet, an upper light-intensifying sheet and a reflective film, the light-diffusing film, the lower light-intensifying sheet and the upper light-intensifying sheet are sequentially attached to the front surface of the arc-shaped light guide plate, and the reflective film is attached to the back surface of the arc-shaped light guide plate.

3. The backlight module according to claim 1, wherein the arc-shaped side of the arc-shaped light guide plate is provided with positioning silicone, the sidewall of the bottom plate is provided with a groove adapted to the size of the positioning silicone, and the arc-shaped light guide plate is fixedly connected to the bottom plate through the positioning silicone.

4. The backlight module for automobile instrument as claimed in claim 2, wherein a film positioning and assembling boss is disposed at the middle of the straight side of the arc light guide plate, and the light-diffusing film, the lower light-adding sheet and the upper light-adding sheet have a first notch adapted to the film positioning and assembling boss at the middle of the straight side, and the film positioning and assembling boss is engaged with the first notch.

5. The backlight module for automobile instrument as claimed in claim 4, wherein the two curved connecting sidewalls of the bottom plate are provided with second notches, and the light-diffusing film, the lower light-adding sheet and the upper light-adding sheet are provided with adaptive protrusions at the two curved connecting portions, and the protrusions are engaged with the second notches.

6. The backlight module for automobile instrument as claimed in claim 1, wherein the perforated silicone rubber has an embossed surface on its surface.

7. The backlight module for automobile instrument as claimed in claim 2, wherein the aperture of the light-diffusing film is surrounded by a circular single-sided adhesive.

8. The backlight module for automobile instrument as claimed in claim 1, wherein the rubber frame is provided with foam rubber.