CN212060817U - Vehicle-mounted backlight source with function of limiting light guide plate and display device - Google Patents

Abstract

The utility model provides an on-vehicle backlight and display device with spacing light guide plate function, includes the light guide plate, is located the lower chase of light guide plate lower extreme and being located the FPCA lamp strip of chase side down, the chase upper surface is close to FPCA lamp strip one side is equipped with and is used for spacingly the location structure of light guide plate, the chase passes through down the location structure is spacing the light guide plate makes the assembly back the light guide plate with the not direct contact of FPCA lamp strip. The utility model discloses still disclose the on-vehicle display device of the on-vehicle backlight that has spacing light guide plate function including the aforesaid. The utility model provides an on-vehicle backlight and display device with spacing light guide plate function sets up the spacing light guide plate of location structure through under the chase, makes the assembly back the light guide plate with FPCA lamp strip direct contact not can avoid the light guide plate to FPCA striking production pressure when high-frequency oscillation to this can avoid FPCA atress fracture and cause the condition that the backlight became invalid, thereby improves the quality guarantee of backlight.

Description

Vehicle-mounted backlight source with function of limiting light guide plate and display device

Technical Field

The utility model relates to an on-vehicle liquid crystal display technical field especially relates to an on-vehicle backlight and display device with spacing light guide plate function.

Background

Currently, on-vehicle liquid crystal display screens have become one of the major flat panel display application markets. Since the liquid crystal in the liquid crystal panel is not luminous, the liquid crystal display must provide external power by means of the backlight source to achieve the display effect. The application field of liquid crystal displays, especially color liquid crystal displays, is rapidly widened, and driven by the market of liquid crystal displays, the backlight industry also presents a prosperous scene, so that the backlight industry is more and more competitive. The quality of the backlight performance can not only affect the display quality of the lcd, but also the cost thereof. Therefore, high-quality and large-sized liquid crystal displays must be equipped with high-performance backlight technology, and the backlight technology is also increasing while new application fields are developed in the industry of liquid crystal display technology. In the conventional vehicle-mounted backlight source, a boss is designed on the light incident side of the light guide plate and abuts against the FPCA, so that the light guide plate is prevented from damaging the LED. However, when the light guide plate vibrates at high frequency, the light incident side boss of the light guide plate generates impact pressure on the FPCA, which may cause the FPCA to break, causing failure of the backlight source, and failing to ensure the quality of the backlight source. Particularly, in a large-sized backlight, the size of the light guide plate is also larger, the risk of the FPCA being damaged by the boss at the light incident side of the light guide plate is also larger, and the injection molding process of the large-sized light guide plate is also limited due to the injection molding machine, and the cutting process of the large-sized light guide plate tends to be used in the future.

The foregoing description is provided for general background information and is not admitted to be prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a can improve on-vehicle backlight and display device of backlight quality guarantee.

The utility model provides an on-vehicle backlight, include the light guide plate, be located the lower chase of light guide plate lower extreme and be located the FPCA lamp strip of chase side down, the chase upper surface is close to down FPCA lamp strip one side is equipped with and is used for spacingly the location structure of light guide plate, the chase passes through down location structure is spacing the light guide plate for the assembly back the light guide plate with the not direct contact of FPCA lamp strip.

Further, the positioning structure is riveted on the upper surface of the lower iron frame.

Furthermore, the positioning structure is a positioning column with a diameter of

The height of the positioning column corresponds to the thickness value of the light guide plate.

Furthermore, the material of the positioning structure is stainless steel or iron galvanized.

Further, location structure is including being located respectively the chase is close to down the first reference column and the second reference column of the left and right sides of FPCA lamp strip one side, the light guide plate correspondence is equipped with in order to cooperate location structure's limit structure, limit structure including corresponding to the first spacing portion that first reference column set up with corresponding to the spacing portion of second that the second reference column set up.

Furthermore, the first positioning column and the first limiting part are assembled in a zero clearance mode in the transverse direction and the longitudinal direction.

Furthermore, the second positioning column and the second limiting part are assembled in a zero-gap mode in the longitudinal direction, an assembling gap distance is arranged in the transverse direction, and the distance is larger than the expansion value of the light guide plate during high-temperature expansion.

Further, the light guide plate is manufactured by a silk-screen cutting process or an injection molding process.

The utility model also provides a vehicle-mounted display device, include as above vehicle-mounted backlight.

The utility model provides an on-vehicle backlight and display device sets up the spacing light guide plate of location structure through the chase under for after the assembly the light guide plate with FPCA lamp strip direct contact not can avoid the light guide plate to FPCA striking production pressure when high-frequency oscillation, can avoid FPCA atress fracture and cause the condition that the backlight became invalid to this, thereby improve the quality guarantee of backlight.

Drawings

Fig. 1 is an explosion diagram of the overall structure of the vehicle-mounted backlight according to the embodiment of the present invention.

Fig. 2 is a front view of a lower bezel of the vehicle-mounted backlight shown in fig. 1.

Fig. 3 is a front view of the light guide plate of the vehicle-mounted backlight shown in fig. 1.

Fig. 4 is a schematic front view of the combination of the lower bezel of the backlight source of fig. 1 with the light guide plate and the FPCA light bar.

Fig. 5 is a schematic view of an overall structure combination of the backlight carrier shown in fig. 1.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

As shown in fig. 1 to 5, in the present embodiment, an in-vehicle backlight is provided, which includes a lower iron frame 2 located at the lowermost layer, a reflection film 5, a light guide plate 1, a diffusion film 6, a lower brightness enhancement film 7, an upper brightness enhancement film 8, a middle adhesive frame 9, and glass fixing foam tapes 10 and a TP (touch panel) fixing double-sided adhesive tape 12 respectively mounted on the upper surface and the inner side of the middle adhesive frame 9. The vehicle-mounted backlight source further comprises a FPCA (flexible printed circuit assembly) light bar 3 and a heat-conducting double-sided adhesive tape 4. FPCA lamp strip 3 is located 2 sides of chase down, pastes in 2 sides of chase down through heat conduction double faced adhesive tape 4. That is, the lower iron frame 2 is located at the lower end of the light guide plate 1. In this embodiment, the horizontal direction is a direction indicated by the long side of the lower iron frame 2, i.e., the left-right direction of the paper. The longitudinal direction is the direction indicated by the short side of the lower iron frame 2, i.e. the front-back direction of the paper.

As shown in fig. 1 and fig. 2, a positioning structure 21 is disposed on a side of an upper surface (in this embodiment, also referred to as a front surface) of the lower bezel 2 close to the FPCA light bar 3 for limiting the light guide plate 1. And a silica gel (not shown) and a double-sided adhesive tape (not shown) are further arranged on one side, away from the FPCA light bar 3, of the upper surface of the lower iron frame 2 so as to fix the light guide plate 1 on the far-light side. The positioning structure 21 includes a first positioning post 211 and a second positioning post 212. In this embodiment, the first positioning column 211 and the second positioning column 212 are respectively located at the left and right sides of one side of the lower iron frame 2 close to the FPCA light bar 3.

As shown in fig. 1 and fig. 3, in the embodiment, the light guide plate 1 is formed by using a silk-screen cutting process or an injection molding process, and when the light guide plate 1 is manufactured by using the silk-screen cutting process, compared with the light guide plate 1 manufactured by using a conventional injection molding process, the cost of the light guide plate 1 is reduced, so that the cost of the backlight source is reduced. Meanwhile, the injection molding process of the large-sized light guide plate 1 is limited by the injection molding machine, so the large-sized light guide plate 1 tends to be cut. In other embodiments, the light guide plate 1 may also be laser engraved. The light guide plate 1 is correspondingly provided with a limiting structure 11 to match with the positioning structure 21. The position limiting structure 11 includes a first position limiting portion 111 and a second position limiting portion 112. In this embodiment, the first position-limiting portion 111 is disposed corresponding to the first positioning post 211, and the second position-limiting portion 112 is disposed corresponding to the second positioning post 212, so as to cooperate with the positioning structure 21 to limit the light guide plate 1.

In this embodiment, the positioning structure 21 is a positioning column, so that the practicability is high. In other embodiments, the positioning structure 21 may also be other structures such as a positioning cone. The diameter range of the positioning post is generally

The backlight sources with different sizes are provided with positioning columns with different diameters, namely the diameter design value of the positioning column of the small-size backlight source can be a little smaller, and the diameter design value of the positioning column of the large-size backlight source is larger, so that the strength is ensured. In consideration of the actual backlight structure, since the positioning posts are required to position the light guide plate 1 in the backlight, the height of the positioning posts is required to correspond to the thickness of the light guide plate 1.

As shown in fig. 1 and 2, in the embodiment, the positioning structure 21 is riveted on the upper surface of the lower iron frame 2, so that the connection deformation is small, the requirement on the connection environment is low, and the connection strength is stable and reliable. In other embodiments, the positioning structure 21 may be connected by welding or other connection methods. In this embodiment, the positioning structure 21 is made of stainless steel or galvanized iron, so that it is not easy to rust. In other embodiments, the positioning structure 21 may be made of other materials such as alloy steel.

As shown in fig. 1 and 4, the first positioning column 211 is used as a positioning base point during assembly. Firstly, the first positioning column 211 and the first limiting part 111 are assembled in a zero clearance mode in the transverse direction and the longitudinal direction, so that the limiting is firm, and the light guide plate 1 is prevented from moving; then, the second positioning column 212 and the second limiting part 112 are assembled in a zero-gap mode in the longitudinal direction, and an assembly gap distance is set in the transverse direction and is larger than the expansion value of the light guide plate 1 in high-temperature expansion, so that the problem of backlight source quality caused by expansion and arching of the light guide plate 1 in a high-temperature environment is avoided; and finally, fixing one side, far away from the FPCA lamp strip 3, of the upper surface of the lower iron frame 2 with the light guide plate 1 in a traditional vehicle-mounted backlight fixing mode, namely fixing the light guide plate 1 by using silica gel and double-sided adhesive tape. At this time, the lower iron frame 2 is assembled with the light guide plate 1 formed by the silk-screen cutting process of the embodiment in a matching manner, and replaces the traditional injection molding light guide plate 1, so that the development cost of a backlight source mold is reduced, and the quality is improved.

The lower iron frame 2 is used for limiting the light guide plate 1 through the first positioning column 211 and the second positioning column 212, so that the assembled light guide plate 1 is not in direct contact with the FPCA light bar 3 on the side edge of the lower iron frame 2. Therefore, the pressure generated by the impact of the light guide plate 1 on the FPCA during high-frequency vibration is avoided, the condition that the backlight source fails due to the stress fracture of the FPCA is avoided, and the quality guarantee of the backlight source is improved.

In another embodiment, a vehicle-mounted display device is further provided, which includes the vehicle-mounted backlight source disclosed in the above embodiment.

In this document, the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for the sake of clarity and convenience of description of the technical solutions, and thus, should not be construed as limiting the present invention.

As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (9)

1. The utility model provides an on-vehicle backlight, its characterized in that includes the light guide plate, is located lower chase of light guide plate lower extreme and being located the FPCA lamp strip of chase side down, the chase upper surface is close to down FPCA lamp strip one side is equipped with and is used for spacingly the location structure of light guide plate, down the chase passes through location structure is spacing the light guide plate makes the assembly back the light guide plate with the not direct contact of FPCA lamp strip.

2. The vehicular backlight according to claim 1, wherein the positioning structure is riveted to an upper surface of the lower bezel.

3. The vehicle-mounted backlight source of claim 1, wherein the positioning structure is a positioning post having a diameter of

The height of the positioning column corresponds to the thickness value of the light guide plate.

4. The vehicle-mounted backlight source of claim 1, wherein the positioning structure is made of stainless steel or galvanized iron.

5. The vehicle-mounted backlight source of claim 1, wherein the positioning structure comprises a first positioning column and a second positioning column respectively located at left and right sides of one side of the lower bezel close to the FPCA light bar, the light guide plate is correspondingly provided with a limiting structure for matching with the positioning structure, and the limiting structure comprises a first limiting portion corresponding to the first positioning column and a second limiting portion corresponding to the second positioning column.

6. The vehicular backlight according to claim 5, wherein the first positioning column and the first position-limiting portion are assembled with zero clearance in both the lateral direction and the longitudinal direction.

7. The vehicular backlight according to claim 6, wherein the second positioning column and the second position-limiting portion are assembled with a zero gap in a longitudinal direction, and an assembly gap distance is set in a transverse direction, and the distance is greater than an expansion value of the light guide plate during high-temperature expansion.

8. The vehicle-mounted backlight source of claim 1, wherein the light guide plate is manufactured by a silk-screen cutting process or an injection molding process.

9. A vehicle-mounted display device characterized by comprising the vehicle-mounted backlight according to any one of claims 1 to 8.

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