TWM638366U - Backlight module and display apparatus - Google Patents

Abstract

A backlight module including a circuit backplane, a light source assembly, a plurality of light emitting devices and a covering member is provided. The circuit backplane has a first surface and a second surface away from each other. The light source assembly is disposed on the first surface, and has a light emitting area. The light emitting devices are disposed on the second surface, and are electrically connected to the circuit backplane. The covering member is disposed on one side of the second surface of the circuit backplane, and bendably extends to one side of the first surface. The covering member exposes the light emitting area of the light source assembly, and has an opening exposing the light emitting devices. A display apparatus adopting the backlight module is also provided.

Description

Backlight module and display device

The invention relates to a light source module and a display device, and in particular to a backlight module and a display device with double-side light emitting.

Non-self-illuminating panels (such as liquid crystal display panels) need illumination light provided by a backlight module to display. The diversified development of display applications has correspondingly increased the specifications and special requirements of backlight modules. Among them, in order to meet the application of double-sided display, a backlight module including two light source modules is proposed. However, this type of backlight module will increase the overall thickness and weight due to an additional set of light source modules or a light board, which makes it difficult to reduce the thickness of the display device using this type of backlight module.

This new creation provides a thinner backlight module capable of emitting light from both sides.

The present invention provides a display device with a relatively thin and light appearance.

Other purposes and advantages of the new creation can be further understood from the disclosed technical characteristics of the new creation.

In order to achieve one or part or all of the above objectives or other objectives, an embodiment of the present invention provides a backlight module. The backlight module includes a circuit backboard, a light source component, a plurality of light emitting elements and a covering part. The circuit backboard has a first surface and a second surface facing away from each other. The light source assembly is arranged on the first surface and has a light exit area. A plurality of light-emitting elements are arranged on the second surface and are electrically connected with the circuit backplane. The covering part is arranged on one side of the second surface of the circuit backboard, and extends to one side of the first surface in a bent manner. The covering part exposes the light emitting area of the light source assembly, and has openings exposing the light emitting elements.

In an embodiment of the new creation, the above-mentioned light source assembly of the backlight module includes a light guide plate, a light source and at least one optical film. The light guide plate has a connected light incident surface and a light exit surface. The light source is arranged on one side of the light incident surface of the light guide plate, and is electrically connected with the circuit backplane. At least one optical film is arranged on one side of the light emitting surface of the light guide plate.

In an embodiment of the new creation, the above-mentioned light source assembly of the backlight module further includes a reflective sheet disposed between the light guide plate and the circuit backplane.

In an embodiment of the new creation, the light guide plate and at least one optical film of the above-mentioned backlight module completely overlap the circuit backplane.

In an embodiment of the new creation, the above-mentioned covering part of the backlight module is a metal backplane.

In an embodiment of the new creation, the above-mentioned covering part of the backlight module is an adhesive tape.

In an embodiment of the new creation, the above-mentioned backlight module is further bonded with a lens element on the circuit backboard. The lens element does not overlap the light source assembly.

In order to achieve one or part or all of the above objectives or other objectives, an embodiment of the present invention provides a display device. The display device includes a backlight module and a display panel. The backlight module includes a circuit backboard, a light source component, a plurality of light emitting elements and a covering part. The circuit backboard has a first surface and a second surface facing away from each other. The light source assembly is arranged on the first surface and has a light exit area. A plurality of light-emitting elements are arranged on the second surface and are electrically connected with the circuit backplane. The covering part is arranged on one side of the second surface of the circuit backboard, and extends to one side of the first surface in a bent manner. The covering part does not overlap the light emitting area of the light source assembly, and has an opening exposing the light emitting elements. The display panel is arranged on the side of the light source component away from the circuit backboard, and overlaps the light emitting area.

In an embodiment of the present invention, the above-mentioned covering part of the display device is an adhesive tape, and the adhesive tape bends and extends from the second surface of the circuit backboard to the side of the display panel away from the light source assembly.

In an embodiment of the present invention, the above-mentioned covering part of the display device is a metal back plate, and the metal back plate bends and extends from the second surface of the circuit back plate to the side of the display panel facing the light source assembly.

Based on the above, in the backlight module and the display device according to an embodiment of the present invention, a light source assembly and a plurality of light emitting elements are respectively provided on opposite sides of the circuit backboard. By integrating these light-emitting elements on the circuit backplane, and bendingly extending the covering member between the two sides of the circuit backplane to expose the light-emitting area of the light source assembly and these light-emitting elements, in addition to reducing the size of the backlight module The assembly man-hours are reduced, and the thickness of the backlight module can be reduced, which helps to improve the appearance and taste of the display device.

In order to make the above-mentioned features and advantages of the new creation more obvious and easy to understand, the following specific examples are given together with the attached drawings for detailed description as follows.

The aforementioned and other technical contents, features and effects of the new creation will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or back, etc., are only directions referring to the attached drawings. Accordingly, the directional terms used are for illustration and not for limitation of the invention.

FIG. 1 is a schematic cross-sectional view of a display device according to a first embodiment of the invention. FIG. 2 is a schematic rear view of the display device in FIG. 1 . Referring to FIG. 1 and FIG. 2 , the display device 1 includes a backlight module 10 and a display panel 50 . The backlight module 10 includes a circuit backplane 100 and a light source assembly 200 . The circuit backboard 100 has a first surface 100s1 and a second surface 100s2 facing away from each other. In this embodiment, the light source assembly 200 is disposed on the first surface 100s1 of the circuit backplane 100 and has a light exit area LEA. The display panel 50 is disposed on the side of the light source assembly 200 away from the circuit backplane 100 , and overlaps the light exit area LEA of the light source assembly 200 . A circuit board 80 is bonded to one side of the display panel 50 to receive external control signals.

It should be noted firstly that the above overlapping relationship means, for example, that the display panel 50 and the light source assembly 200 overlap along the normal direction of the first surface 100s1 of the circuit backplane 100 . If not specifically mentioned below, any overlapping relationship between the two is defined by the same direction, and the overlapping directions of the two will not be repeated.

In this embodiment, the light source assembly 200 may include a light guide plate 210 , a light source 220 , at least one optical film 230 and a reflection sheet 240 , but not limited thereto. The light guide plate 210 has a light incident surface 210is, a light exit surface 210es and a bottom surface 210bs, wherein the light incident surface 210is is located between the light exit surface 210es and the bottom surface 210bs, and is respectively connected to the light exit surface 210es and the bottom surface 210bs. The light source 220 is disposed on one side of the light incident surface 210is of the light guide plate 210 , and is electrically connected to the circuit backplane 100 . In this embodiment, the circuit backplane 100 joined with the light source 220 may be a printed circuit board assembly (PCBA).

At least one optical film 230 is disposed on one side of the light emitting surface 210es of the light guide plate 210 and overlaps the light emitting area LEA. The at least one optical film 230 is, for example, a tinted film, an optical brightness enhancement film, a diffusion film, or a combination thereof, but is not limited thereto. The reflection sheet 240 is disposed on one side of the bottom surface 210bs of the light guide plate 210 , and is located between the circuit backplane 100 and the light guide plate 210 . The reflective sheet 240 is, for example, a silver reflective sheet, a white reflective sheet, or other films with high reflectivity.

For example, the light source 220 can be enabled through the circuit backplane 100 to emit the illumination light beam ILB toward the light incident surface 210is of the light guide plate 210 . The illumination light beam ILB is adapted to pass through the light guide plate 210 and exit from the light emitting surface 210es of the light guide plate 210 . The illumination light beam ILB irradiates the display panel 50 after passing through the optical film 230 to display image images. In this embodiment, the display panel 50 is, for example, a liquid crystal display panel, which may include a pixel array substrate 51 , a color filter substrate 52 , a first polarizer 53 and a second polarizer 54 . A liquid crystal layer (not shown) is interposed between the pixel array substrate 51 and the color filter substrate 52, and the first polarizer 53 and the second polarizer 54 are respectively arranged on the pixel array substrate 51 and the color filter substrate 52. The sides that diverge, but are not limited to. In addition, the aforementioned circuit board 80 can be bonded on the surface (not shown) of the pixel array substrate 51 exposed by the color filter substrate 52 , but is not limited thereto.

It should be noted that the circuit backplane 100 of the backlight module 10 can extend on one side of the light source assembly 200 , and the light guide plate 210 , the optical film 230 and the reflection sheet 240 can completely overlap the circuit backplane 100 . That is to say, the orthographic projections of the light guide plate 210 , the optical film 230 and the reflection sheet 240 on the circuit backplane 100 are located within the first surface 100s1 of the circuit backplane 100 .

In this embodiment, the backlight module 10 further includes a plurality of light-emitting elements 300 disposed on the second surface 100s2 of the circuit backplane 100 and electrically connected to the circuit backplane 100 . The light emitting elements 300 can be selectively arranged to overlap the light exit area LEA of the light source assembly 200 and have the same or different light emitting colors, but not limited thereto. In this embodiment, these light emitting elements 300 may be arranged in an array on the second surface 100s2 of the circuit backplane 100 (as shown in FIG. 2 ). The light emitting element 300 is, for example, a submillimeter light emitting diode (mini light emitting diode, mini-LED) or a micro light emitting diode (micro light emitting diode, micro-LED), but not limited thereto.

More specifically, in addition to controlling the light source 220 of the light source assembly 200 to emit the illumination beam ILB, the circuit backplane 100 can individually control the light emitting elements 300 to emit the image beam IMB in a direction away from the display panel 50 . That is, the light emitting elements 300 located on the side of the circuit backplane 100 facing away from the display panel 50 can also be used to display images or characters.

By integrating (for example, stamping) the above-mentioned light-emitting elements 300 on the printed circuit board assembly (that is, the circuit backplane 100 on which the light source 220 of the light source assembly 200 is bonded), it is possible to meet the double-sided light emission requirements of the backlight module 10 , taking into account the thickness and weight of the backlight module 10 as a whole, which helps to reduce the thickness of the display device 1 with double-sided display function. In addition, the man-hours for assembling the backlight module 10 can also be reduced.

Furthermore, the backlight module 10 further includes a covering member 400, which is arranged on one side of the second surface 100s2 of the circuit backplane 100, and extends from the second surface 100s2 of the circuit backplane 100 to the display panel 50 in a bent manner. One side of the light source assembly 200 . In other words, the covering member 400 bends and extends from the second surface 100s2 of the circuit backboard 100 to one side of the first surface 100s1 of the circuit backboard 100 . In this embodiment, the covering member 400 is, for example, a metal back plate. The front frame portion 400f of the metal back plate bent to the side of the display panel 50 facing the light source assembly 200 can be used to receive the display panel 50 , and the front frame portion 400f can define the light exit area LEA of the light source assembly 200 . That is, the front frame portion 400f of the covering member 400 in this embodiment is located between the display panel 50 and the light source assembly 200 and does not overlap the light exit area LEA of the light source assembly 200 , but is not limited thereto.

It is particularly noted that the portion of the covering member 400 on the side of the second surface 100s2 of the circuit backplane 100 has an opening OP exposing the light emitting elements 300 , that is, the light emitting elements 300 are located in the opening OP. It should be noted that the number of light-emitting elements 300 and the size and position of the opening OP of the covering member 400 in FIG. 2 are only for illustrative purposes and are not intended to limit the invention of the present invention.

In this embodiment, at least one connector (not shown) may be provided on the second surface 100s2 of the circuit backboard 100 to connect the signal cable (not shown) and the signal control board (not shown) Electrically coupled, but not limited to.

Another embodiment will be listed below to describe the present disclosure in detail, wherein the same components will be marked with the same symbols, and the description of the same technical content will be omitted.

FIG. 3 is a schematic cross-sectional view of a display device according to a second embodiment of the present invention. FIG. 4 is a schematic rear view of the display device in FIG. 3 . Please refer to FIG. 3 and FIG. 4 , the difference between the display device 2 of this embodiment and the display device 1 of FIG. 1 lies in that the materials and arrangement of the covering parts are different. Specifically, the circuit backplane 100A of the backlight module 10A of this embodiment may have better stiffness or mechanical strength than the circuit backplane 100 of FIG. 1 . Therefore, in this embodiment, an adhesive tape with relatively low cost can be selected as the covering member 400A.

For example, in this embodiment, the adhesive tape as the covering member 400A can be attached on the surrounding surface of the color filter substrate 52 of the display panel 50 facing away from the light source assembly 200, and along the display panel 50 and the circuit backplane 100A The edge of the circuit backboard 100A bends and extends to one side of the second surface 100s2 of the circuit backplane 100A. That is to say, the covering member 400A of the present embodiment bends and extends from the second surface 100s 2 of the circuit backplane 100A to the side of the display panel 50 away from the light source assembly 200 .

It should be noted that the portion of the covering member 400A disposed on the second surface 100 s 2 of the circuit backplane 100A may be a combination of a plurality of wing portions 410 . That is, the part of the covering member 400A attached to the second surface 100s2 of the circuit backplane 100A does not continuously surround the circuit backplane 100A, but is attached to the circuit backplane 100A with a plurality of wing parts 410 disconnected from each other. the four sides.

Since the circuit backboard 100A of this embodiment has better stiffness or mechanical rigidity than the circuit backboard 100 in FIG. Board area utilization of board 100A. For example: increasing the layout space of the circuit backplane 100A on the second surface 100s2 for packaging. It should be noted that the width of the wing portion 410 here refers to the width of the wing portion 410 in a direction perpendicular to the extending direction of the attached side edge thereof.

From another point of view, compared with the opening OP-A of the covering part 400 of FIG. 2 , the opening OP-A of the covering part 400A of this embodiment may have a larger opening area. In particular, in this embodiment, the front frame portion 400Af of the cover member 400A attached to the side of the display panel 50 facing away from the light source assembly 200 can define the display area DA of the display device 2 .

FIG. 5 is a schematic cross-sectional view of a display device according to a third embodiment of the present invention. FIG. 6 is a schematic front view of the display device in FIG. 5 . Please refer to FIG. 5 and FIG. 6, different from the display device 2 shown in FIG. 3 and FIG. 4, the first surface 100s1 of the backlight module 10B of the display device 3 in this embodiment can also be bonded with a lens element 150 on the first surface 100s1 of the circuit backplane 100B. , and the lens element 150 does not overlap the light source assembly 200 . For example, as shown in FIG. 6 , the lens element 150 can be stamped on the portion of the circuit backplane 100B extending from the upper edge of the display panel 50 , but not limited thereto. In other embodiments, the portion of the circuit backplane 100B extending from the edge of the display panel 50 can also be used to arrange electronic components for different application requirements.

On the other hand, since the circuit backplane 100B of this embodiment extends from the upper edge of the display panel 50, the adhesive tape used as the covering member 400B only covers the left and right sides and the lower edge of the display panel 50 in FIG. edge, but not limited to this.

To sum up, in the backlight module and the display device according to an embodiment of the present invention, a light source assembly and a plurality of light emitting elements are respectively provided on opposite sides of the circuit backboard. By integrating these light-emitting elements on the circuit backplane, and bendingly extending the covering member between the two sides of the circuit backplane to expose the light-emitting area of the light source assembly and these light-emitting elements, in addition to reducing the size of the backlight module The assembly man-hours are reduced, and the thickness of the backlight module can be reduced, which helps to improve the appearance and taste of the display device.

But the above is only a preferred embodiment of the new creation, and should not limit the scope of the implementation of the new creation, that is, all simple equivalents made according to the patent scope of the new creation and the content of the new creation Changes and modifications all still belong to the scope covered by the invention patent. In addition, any embodiment or patent scope of the present invention does not need to achieve all the purposes or advantages or characteristics disclosed by the present invention. In addition, the abstract part and the title are only used to assist in the search of patent documents, and are not used to limit the scope of rights of this new creation. In addition, terms such as "first" and "second" mentioned in this specification or the scope of the patent application are only used to name elements (elements) or to distinguish different embodiments or ranges, and are not used to limit the number of elements. upper or lower limit.

1, 2, 3: display device 10, 10A, 10B: backlight module 50: display panel 51: Pixel array substrate 52: Color filter substrate 53: The first polarizer 54:Second polarizer 80: circuit board 100, 100A, 100B: circuit backplane 100s1: first surface 100s2: second surface 150: lens element 200: light source components 210: light guide plate 210is: incident surface 210es: light emitting surface 210bs: Bottom 220: light source 230: Optical film 240: reflector 300: light emitting element 400, 400A, 400B: cladding 400f, 400Af: front frame part 410: wing part DA: display area ILB: Illumination Beam IMB: image beam LEA: light exit area OP, OP-A: Open

FIG. 1 is a schematic cross-sectional view of a display device according to a first embodiment of the invention. FIG. 2 is a schematic rear view of the display device in FIG. 1 . FIG. 3 is a schematic cross-sectional view of a display device according to a second embodiment of the present invention. FIG. 4 is a schematic rear view of the display device in FIG. 3 . FIG. 5 is a schematic cross-sectional view of a display device according to a third embodiment of the present invention. FIG. 6 is a schematic front view of the display device in FIG. 5 .

1: Display device

10: Backlight module

50: display panel

51: Pixel array substrate

52: Color filter substrate

53: The first polarizer

54:Second polarizer

100: circuit backplane

100s1: first surface

100s2: second surface

200: light source components

210: light guide plate

210is: incident surface

210es: light emitting surface

210bs: Bottom

220: light source

230: Optical film

240: reflector

300: light emitting element

400: cladding

400f: front frame part

ILB: Illumination Beam

IMB: image beam

LEA: light exit area

OP: opening

Claims (10)

A backlight module, comprising: A circuit backboard has a first surface and a second surface which are facing away from each other; A light source component is arranged on the first surface and has a light exit area; a plurality of light-emitting elements, disposed on the second surface, and electrically bonded to the circuit backplane; and A covering part is arranged on one side of the second surface of the circuit backboard and extends to one side of the first surface in a bent manner, the covering part exposes the light emitting area of the light source module, and has An opening exposing the light emitting elements. The backlight module as described in claim 1, wherein the light source assembly includes: A light guide plate having a light incident surface and a light exit surface connected to each other; a light source, disposed on one side of the light incident surface of the light guide plate, and electrically connected to the circuit backplane; and At least one optical film is arranged on one side of the light emitting surface of the light guide plate. The backlight module according to claim 2, wherein the light source assembly further includes a reflective sheet disposed between the light guide plate and the circuit backplane. The backlight module as claimed in claim 2, wherein the light guide plate and the at least one optical film completely overlap the circuit backplane. The backlight module as claimed in claim 1, wherein the covering part is a metal back plate. The backlight module as claimed in claim 1, wherein the covering member is an adhesive tape. The backlight module according to claim 1, wherein a lens element is bonded to the circuit backboard, and the lens element does not overlap the light source assembly. A display device comprising: A backlight module, including: A circuit backboard has a first surface and a second surface which are facing away from each other; A light source component is arranged on the first surface and has a light exit area; a plurality of light-emitting elements, disposed on the second surface, and electrically bonded to the circuit backplane; and A covering part is arranged on one side of the second surface of the circuit backboard and extends to one side of the first surface in a bent manner, the covering part does not overlap the light emitting area of the light source module, and having an opening exposing the light emitting elements; and A display panel is arranged on the side of the light source component away from the circuit backboard and overlaps the light emitting area. The display device as claimed in claim 8, wherein the covering member is an adhesive tape, and the adhesive tape bends and extends from the second surface of the circuit backboard to a side of the display panel facing away from the light source assembly. The display device as claimed in item 8, wherein the covering member is a metal back plate, and the metal back plate is bent and extended from the second surface of the circuit back plate to the side of the display panel facing the light source module .

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