CN212060823U

CN212060823U - Direct type backlight source capable of improving brightness and display device

Info

Publication number: CN212060823U
Application number: CN202021168393.4U
Authority: CN
Inventors: 曹俊威; 冯超
Original assignee: Shenzhen Hadbest Electronics Co ltd
Current assignee: Shenzhen Hadbest Electronics Co ltd
Priority date: 2020-06-22
Filing date: 2020-06-22
Publication date: 2020-12-01
Anticipated expiration: 2030-06-22

Abstract

The utility model discloses a straight following formula backlight and display device that improves luminance, straight following formula backlight that improves luminance include light emitting component, are located the light emitting component top is used for with the light of light emitting component transmission carries out the optical panel that conducts and is located light emitting component with be used for between the optical panel with the optical panel part reflects back light reflects back once more optical panel's reflectance coating, light emitting component includes light emitting component, the reflectance coating is attached in the light emitting component upper surface, and corresponds the light emitting component position is equipped with the confession the through-hole that light emitting component exposed. The utility model provides a straight following formula backlight and display device of improvement luminance has improved the ultimate surface brightness of straight following formula backlight to can energy-conserving increase and reduce calorific capacity, reduce cost, improve product quality reliability.

Description

Direct type backlight source capable of improving brightness and display device

Technical Field

The utility model discloses the demonstration relates to technical field, especially relates to a straight following formula backlight and display device who improves luminance.

Background

The development of the automobile cabin is different day by day in recent years, and under the promotion of the policy interest of the new energy automobile, the display demand in the automobile is changed greatly, the popularization of the cabin interior decoration display of the traditional fuel automobile is synchronously driven, the automobile cabin interior decoration display is developed towards diversified directions such as large screen, multi-screen, integrated screen and curved surface abnormity, the luxurious degree and high-tech black-technology bright points of the automobile are displayed, and the comfortable riding experience of consumers can be brought. With the improvement of display requirements, the brightness of the display screen in the vehicle is generally required to be higher, usually reaching more than 1000nits, and is much higher than the mainstream specification of more than 600nits in the past years, and especially some large-screen design applications adopt a direct type LED backlight source design of being dynamically driven by using lost imming (dimming), and the number of LEDs required by the direct type backlight source is much larger than that of LEDs distributed in a conventional side type, so that the specification requirement of high brightness is met.

The conventional direct type backlight source is usually prepared by printing white oil (or not brushing white oil) on the surface of a Printed Circuit Board (PCB)/flexible printed circuit board (FPC), and because the reflectivity of the white oil is not high, a lot of light rays are absorbed or lost, the reflection utilization rate of LED light rays on a diffusion plate and the PCB/FPC is low, the overall brightness is low, the energy consumption is increased, a light emitting surface is not easy to be uniform, the light between a lamp and the lamp can be dark, and the grid shadow is easy to appear.

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 straight following formula backlight and display device of improvement luminance that can energy-conservation increase and reduce calorific capacity, reduce cost.

The utility model provides a straight following formula backlight of luminance is improved, include light emitting component, be located the light emitting component top is used for with the light of light emitting component transmission carries out the optical panel that conducts and is located light emitting component with be used for between the optical panel with the optical panel part reflects back light reflects back once more optical panel's reflectance coating, light emitting component includes light emitting component, the reflectance coating attach in the light emitting component upper surface, and correspond the light emitting component position is equipped with the confession the through-hole that light emitting component exposed.

Further, the shape of the through hole corresponds to the shape of the light emitting element, and the diameter of the through hole is larger than that of the light emitting element.

Further, the light-emitting component comprises a plurality of light-emitting elements and an FPC or a PCB, the plurality of light-emitting elements are attached to the FPC or the PCB, and the reflecting film is attached to the upper surface of the FPC or the PCB.

Further, the shape of the reflection film corresponds to the shape of the FPC or the PCB, and the size of the reflection film is smaller than that of the FPC or the PCB.

Furthermore, the reflecting film is attached to the FPC or the upper surface of the PCB by adopting an alignment jig.

Further, the reflective film is attached to the upper surface of the FPC or the PCB through a double-sided adhesive tape, the double-sided adhesive tape is arranged on the lower surface of the reflective film, the double-sided adhesive tape is integrally compounded on the reflective film and then cut and formed through a cutting die, or the double-sided adhesive tape is locally compounded on the reflective film and then cut and formed through the cutting die.

Further, the direct type backlight source further comprises an optical film sheet located above the optical panel.

Further, the direct type backlight source further comprises a frame for carrying the light emitting assembly, the reflective film and the optical panel, the frame comprises a baffle wall portion, and the light emitting assembly, the reflective film and the optical panel are mounted inside the baffle wall portion.

Furthermore, the lower surface of the light-emitting component is provided with heat-conducting glue, and the light-emitting component is attached to the inner part of the retaining wall part through the heat-conducting glue.

The utility model also provides a display device, including the display screen with as above straight following formula backlight, the display screen install in straight following formula backlight upper surface.

The utility model provides an increase straight following formula backlight and display device of luminance is through attaching the reflective film in the light-emitting component upper surface, and be equipped with the through-hole that supplies light-emitting component to expose at the reflective film corresponding light-emitting component position, make the light that reflects back from the optics panel part reflect back optical panel once more, finally increased the light that pierces through away from the optics panel, the ultimate surperficial luminance of straight following formula backlight has been improved, thereby can be energy-conserving increase and reduce calorific capacity, and low cost has improved product quality reliability.

Drawings

Fig. 1 is an exploded view of the display device according to the embodiment of the present invention.

Fig. 2 is a schematic view of a reflective film structure of a direct type backlight source in the display device shown in fig. 1.

Fig. 3 is a schematic front view of a direct type backlight in the display device shown in fig. 1.

Fig. 4 is a schematic reverse view of a direct type backlight in the display device 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.

In the present embodiment, a direct-type backlight source with improved brightness is provided, which includes a light emitting device 1, an optical panel 2 located above the light emitting device 1, a reflective film 8 located between the light emitting device 1 and the optical panel 2, an optical film located above the optical panel 2, and a frame 4 for supporting the light emitting device 1, the reflective film 8, and the optical panel 2. Wherein the optical membrane is located within the frame 4.

The optical panel 2 is used for transmitting the light emitted by the light emitting component 1. In this embodiment, the optical panel 2 is a diffusion plate for optically diffusing the light emitted from the light emitting assembly 1 uniformly. Of course, in other embodiments, the optical panel 2 may also be a light guide or the like, as long as the light can be transmitted.

The light emitting assembly 11 includes a light emitting element 11 and an FPC12 or a PCB 12. The light emitting element 11 is attached to an FPC12 or a PCB12, and the light emitting module 1 may also be referred to as an FPCA (flexible circuit assembly) or a PCBA (printed circuit board assembly) in this embodiment. The lower surface of the light emitting element 1 is provided with a heat conductive adhesive (not shown).

In this embodiment, the light emitting elements 11 are LED lamps, and the number thereof is plural. The plurality of light emitting elements 11 are attached to the FPC12 or the PCB 12. After the light emitted from the light emitting device 11 passes through the optical panel 2, a portion of the light passes through the optical panel 2 to emit light uniformly from the front surface, and a portion of the light is reflected from the optical panel 2 to the reflective film 8.

The FPC12 or the PCB12 has a plurality of pads (not shown) on the front surface. Each light emitting element 11 is attached to one pad. Specifically, one light emitting element 11 is attached to one pad. The reverse side of the FPC12 or PCB12 is provided with a connector 121 for electrical conduction.

In this embodiment, the frame 4 is a lower iron frame and has high strength. In other embodiments, the frame 4 may also be a rubber frame bracket or the like. The frame 4 includes a blocking wall portion 41 and a supporting portion 42 located below the blocking wall portion 41 to support the blocking wall portion 41 and to dissipate heat. The frame 4 is provided with mounting holes 43 through which the connectors pass. The mounting hole 43 is provided in the support portion 42.

In this embodiment, the optical sheet includes a lower brightness enhancement film 5, a DBEF (reflective polarization enhancement film) 6, and a light shielding film 7. In this embodiment, there are two lower brightness enhancement films 5, and the two lower brightness enhancement films 5 are tightly attached to each other after being assembled. The two lower brightness enhancement films 5, DBEF6, and the light shielding film 7 are disposed in this order from the bottom to the top inside the retaining wall 41 of the frame 4. In this embodiment, the light shielding film 7 is a light shielding double-sided tape. The periphery of the shading film 7 is adhered with DBEF6, and the middle part of the shading film is exposed out of the light emitting region corresponding to the light emitting component 1, so as to fix the two lower brightness enhancement films 5 and DBEF 6.

The function of the reflective film 8 is to reflect light with high reflectivity, i.e. to reflect light partially reflected by the optical panel 2 back to the optical panel 2 again. The reflection film 8 is provided with a through hole 81 for exposing the light emitting element 11 at a position corresponding to the light emitting element 11. The lower surface of the reflection film 8 is provided with a double-sided adhesive tape 82. In this embodiment, the shape of the reflective film 8 corresponds to the shape of the FPC12 or the PCB12, i.e., can be determined according to the size requirement of the FPC12 or the PCB 12. But the size of the reflective film 8 is ensured to be slightly smaller than that of the FPC12 or the PCB12 so as not to interfere with the inside of the retaining wall portion 41 of the frame 4.

In this embodiment, the reflective film 8 is attached to the upper surface of the light emitting device 1 by using an alignment fixture, so as to meet the requirement of a more precise alignment and bonding process. Specifically, the reflective film 8 is attached to the upper surface of the FPC12 or the PCB12 by the double-sided tape 82 disposed on the lower surface thereof, so as to prevent the reflective film 8 from falling off due to heat generated during the operation of the light emitting assembly 1, thereby ensuring the stability of the reflective film 8.

The double-sided adhesive tape 82 is integrally compounded on the reflective film 8 and then cut and formed by a cutting die, or the double-sided adhesive tape 82 is locally compounded on the reflective film 8 and then cut and formed by a cutting die. The double-sided adhesive tape 82 and the reflective film 8 are cut together to form the reflective film 8, so that the reflective film 8 can be firmly fixed on the upper surface of the FPC12 or the PCB 12.

In this embodiment, the through hole 81 is a portion where the reflective film 8 is cut out corresponding to the light emitting element 11 when cutting. The through holes 81 are provided to avoid the light emitting elements 11 when the reflective film 8 is attached, so that the reflective film 8 can be directly attached to the surface of the FPC12 or the PCB 12. In the present embodiment, the number of the through holes 81 corresponds to the number of the light emitting elements 11, and is also plural. The shape of the through hole 81 corresponds to the shape of the light emitting element 11, and the diameter of the through hole 81 is larger than the diameter of the light emitting element 11 so as not to contact or interfere with the through hole 81 and the light emitting element 11 during attachment. In this embodiment, each of the peripheries of the through holes 81 is larger than each of the peripheries of the light emitting elements 11 and the bonding pads by 0.5mm or more.

The direct type backlight source of the embodiment has the following specific assembly steps:

the light emitting element 11 is first attached to the FPC12 or the PCB 12. Namely, each light emitting element 11 is correspondingly bonded on one bonding pad, and the light emitting assembly 1 is formed after the bonding is completed.

The light emitting module 1 is then mounted inside the retaining wall portion 41 of the frame 4. Namely, the heat-conducting glue on the lower surface is adhered to the inner surface of the wall part 41, so as to fix the light-emitting assembly 1 and the heat-conducting frame 4 for heat dissipation. At the same time, the connector 121 is attached to the outside of the support portion 42 through the mounting hole 43.

The reflective film 8 is then mounted inside the retaining wall 41 of the frame 4. When the LED module is installed, the reflection film 8 is attached to the upper surface of the light emitting component 1 by using the alignment jig. Specifically, the light emitting element 11 is exposed from the through hole 81 of the reflection film 8 by adhering the double-sided tape 82 provided on the lower surface thereof to the FPC12 or the upper surface of the PCB 12.

Finally, the optical panel 2 and the optical film are assembled inside the retaining wall 41 of the frame 4. That is, the optical panel 2, the two lower brightness enhancement films 5, the DBEF6, and the light shielding film 7 are assembled in this order from the bottom up.

In this embodiment, the reflective film 8 is attached to the upper surface of the light emitting assembly 1, and the through hole 81 for exposing the light emitting element 11 is disposed at the position of the reflective film 8 corresponding to the light emitting element 11, when the light emitted from the light emitting element 11 is partially reflected by the upper optical panel 2, the reflective film 8 with high reflectivity reflects the light back to the optical panel 2 again for reuse, so that after the light is reflected for multiple times, the light energy finally penetrating through the optical panel 2 is increased, i.e., the light penetrating from the optical panel 2 is increased, the final surface brightness of the direct-type backlight is improved, and the uniformity of surface light emission is also improved. The advantage of improving the final surface brightness of the direct type backlight source can reduce the brightness dependence of the light emitting elements 11, or reduce the number of the light emitting elements 11, thereby saving energy, improving efficiency, reducing heat productivity, reducing cost and improving the quality reliability of products.

In this embodiment, since the reflective film 8 is disposed on the surface of the FPC12 or the PCB12, the conventional printing of white oil on the surface of the FPC12 or the PCB12 can be omitted, thereby further reducing the physical cost of the FPC12 or the PCB 12.

In the embodiment, a display device is further provided and is used for an automobile. The display device comprises a display screen 9 and the direct type backlight source, wherein the display screen 9 is arranged on the upper surface of the direct type backlight source. Specifically, the display screen 9 is fixed to the upper surface of the light shielding film 7. The display panel 9 is a TFT (thin film transistor) liquid crystal panel.

In this embodiment, the light shielding film 7 plays a role of a bridge, not only can fix the DBEF6, but also plays a role of connecting the display screen 9, and is mainly applied to the small-sized display screen 9. Of course, in other embodiments, when the size of the display screen 9 is larger, the middle frame can be matched with the frame 4 to fix the DBEF6 and connect the display screen 9. The middle frame is a rubber frame or a middle iron frame.

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

1. The direct type backlight source capable of improving brightness is characterized by comprising a light emitting component, an optical panel and a reflecting film, wherein the optical panel is located above the light emitting component and used for conducting light rays emitted by the light emitting component, the reflecting film is located between the light emitting component and the optical panel and used for reflecting the light rays reflected by the optical panel back to the optical panel again, the light emitting component comprises a light emitting element, the reflecting film is attached to the upper surface of the light emitting component, and a through hole for exposing the light emitting element is formed in the position corresponding to the light emitting element.

2. The direct backlight source for increasing brightness according to claim 1, wherein the through hole has a shape corresponding to the shape of the light emitting element, and the diameter of the through hole is larger than the diameter of the light emitting element.

3. The direct backlight source with improved brightness according to claim 1, wherein the light emitting assembly comprises a plurality of light emitting elements and an FPC or a PCB, the plurality of light emitting elements are attached to the FPC or the PCB, and the reflective film is attached to an upper surface of the FPC or the PCB.

4. A direct backlight source with improved brightness as claimed in claim 3, wherein the shape of the reflective film corresponds to the shape of the FPC or PCB, and the size of the reflective film is smaller than the size of the FPC or PCB.

5. The direct backlight source with improved brightness according to claim 3, wherein the reflective film is attached to the upper surface of the FPC or the PCB by an alignment fixture.

6. The direct backlight source with improved brightness according to claim 4, wherein the reflective film is attached to the FPC or the PCB via a double-sided adhesive tape, the double-sided adhesive tape is disposed on the lower surface of the reflective film, and the double-sided adhesive tape is integrally formed with the reflective film and then cut with a knife mold, or the double-sided adhesive tape is partially formed with the reflective film and then cut with a knife mold.

7. The direct backlight of claim 1, further comprising an optical film over the optical panel.

8. The direct backlight of claim 1, further comprising a frame for supporting the light emitting elements, the reflective film and the optical panel, wherein the frame comprises a wall portion, and the light emitting elements, the reflective film and the optical panel are mounted inside the wall portion.

9. The direct backlight source of claim 8, wherein the light emitting elements are adhered to the inner portion of the barrier wall by a heat conductive adhesive disposed on the lower surface of the light emitting elements.

10. A display device comprising a display screen and the direct type backlight according to any one of claims 1 to 9, wherein the display screen is mounted on the upper surface of the direct type backlight.