Backlight module

Abstract

The invention discloses a backlight module. The backlight module comprises a plurality of optical films, a single-sided adhesive tape, an adhesive material and at least two fixing columns, the optical films include a first optical film and a plurality of second optical films. The second optical films are stacked on each other, and the first optical film covers the second optical films but does not cover at least a part of the edge area of each second optical film. The single-sided adhesive tape covers and is attached to the edge area of each second optical film. The rubber material is connected between the edge areas of the first optical film and the adjacent second optical film. The at least two fixing columns are arranged around the optical films.

Description

Technical Field

[0001] The invention relates to a light source device, in particular to a backlight module. Background Art

[0002] The existing backlight module includes multiple optical films. When assembling to manufacture the backlight module, in order to prevent the displacement of the optical films and thus adversely affect the light emitted by the backlight module, the optical films need to be fixed so that the optical films do not move relative to each other. Generally speaking, the edge areas of the optical films are overlapped, and a layer of double-sided tape is sandwiched between the edge areas of each two adjacent optical films so that the double-sided tape can adhere and positionally fix the optical films. Summary of the invention

[0003] At least one embodiment of the present invention provides a backlight module to reduce the usage of double-sided tape.

[0004] At least one embodiment of the present invention provides a backlight module, comprising a plurality of optical films, a single-sided tape, a glue material and at least two fixing posts. The optical films include a first optical film and a plurality of second optical films. The second optical films are stacked on each other, wherein the first optical film covers the second optical films but does not cover at least a portion of the edge area of ​​at least one second optical film. The single-sided tape covers and adheres to the edge area of ​​each second optical film. The glue material is connected between the edge area of ​​the first optical film and the adjacent second optical film. At least two fixing posts are arranged around the optical films.

[0005] In at least one embodiment of the present invention, a portion of the single-sided tape is located between the first optical film and the second optical films.

[0006] In at least one embodiment of the present invention, in the two adjacent second optical films stacked on each other, the edge area of ​​the upper second optical film covers the edge area of ​​the lower second optical film, but a portion of the edge area of ​​the lower second optical film is not covered by the upper second optical film.

[0007] In at least one embodiment of the present invention, the second optical films include an intermediate film and a bottom film. The intermediate film has an edge region of the intermediate film forming a lug. The bottom film is located below the intermediate film, wherein the intermediate film is located between the bottom film and the first optical film, and at least a portion of the edge region of the bottom film is not covered by the intermediate film.

[0008] In at least one embodiment of the present invention, the single-sided tape is transparent, black, gray or white.

[0009] In at least one embodiment of the present invention, two of the at least two fixing posts are respectively disposed on two opposite sides of the optical films.

[0010] In at least one embodiment of the present invention, two of the at least two fixing posts are respectively disposed on two adjacent sides of the optical films.

[0011] In at least one embodiment of the present invention, one of the three fixing columns is located between the other two fixing columns.

[0012] In at least one embodiment of the present invention, the backlight module further comprises a housing. The housing comprises a frame and a plurality of light-emitting elements. The frame has a surface, wherein the optical films and at least two fixing columns are disposed on the surface. The light-emitting elements are located within the housing and below the optical films.

[0013] In at least one embodiment of the present invention, the backlight module further comprises a light guide plate and a light emitting element. The light guide plate has a light emitting surface and a side surface connected to the light emitting surface, wherein at least two fixing columns protrude from the light emitting surface. The light emitting element is located on the side surface of the light guide plate.

[0014] At least one embodiment of the present invention provides a backlight module, comprising a plurality of optical films, a glue material and at least two fixing posts. The optical films include a first optical film and a plurality of second optical films. The second optical films are stacked on each other, wherein the first optical film fully covers the second optical films. The glue material is connected between the edge regions of the first optical film and each of the second optical films. At least two fixing posts are disposed around the optical films.

[0015] Based on the above, in the backlight module disclosed in the above embodiments of the present invention, the edge area and position of the optical film are designed to be asymmetric, so that the single-sided tape can cover and adhere to the edge area of ​​each second optical film at one time, which helps to reduce the amount of tape loss during assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the above and other features, advantages and embodiments of the present invention more clearly understood, the detailed description of the accompanying drawings is as follows:

[0017] Figure 1A FIG. 4 is a schematic top view of a backlight module according to at least one embodiment of the present invention.

[0018] Figure 1B for Figure 1A An enlarged top view of a backlight module without the single-sided tape is shown in FIG.

[0019] Figure 1C for Figure 1A FIG. 1 is a schematic cross-sectional diagram of a backlight module drawn along the section line AA.

[0020] Figure 1D It is a cross-sectional schematic diagram of a backlight module according to at least one embodiment of the present invention.

[0021] Figure 2A FIG. 4 is a schematic top view of a backlight module according to another embodiment of the present invention.

[0022] Figure 2B for Figure 2A A schematic cross-sectional view of the backlight module in FIG.

[0023] Wherein, the reference numerals are:

[0024] 100, 300, 400: backlight module

[0025] 110, 410: First optical film

[0026] 120, 130: Second optical film

[0027] 140: Fixed column

[0028] 150: Rubber

[0029] 152, 172: Rubber surface

[0030] 160, 460: Edge area

[0031] 170: Single-sided tape

[0032] 173: No glue surface

[0033] 310: Shell

[0034] 320: Die casting

[0035] 330: Framework

[0036] 340: Surface

[0037] 250, 350: Light-emitting components

[0038] 210: Light guide plate

[0039] 220: Light-emitting surface

[0040] 230: Side

[0041] AA, BB: hatching DETAILED DESCRIPTION

[0042] In the following text, in order to clearly present the technical features of the present invention, the dimensions (e.g., length, width, thickness, and depth) of the elements (e.g., layers, films, substrates, and regions, etc.) in the drawings will be enlarged in unequal proportions, and the number of some elements will be reduced. Therefore, the description and explanation of the embodiments below are not limited to the number of elements in the drawings and the dimensions and shapes presented by the elements, but should cover the dimensions, shapes, and deviations thereof caused by the actual process and / or tolerances. For example, the flat surface shown in the drawings may have rough and / or nonlinear features, and the acute angles shown in the drawings may be rounded. Therefore, the elements presented in the drawings of the present invention are mainly for illustration, and are not intended to accurately depict the actual shape of the elements, nor are they intended to limit the scope of the patent application of the present invention.

[0043] Secondly, the words "about", "approximately" or "substantially" that appear in the content of this case not only cover the numerical values ​​and numerical ranges that are clearly recorded, but also cover the allowable deviation range that can be understood by those with ordinary knowledge in the technical field to which the invention belongs, wherein this deviation range can be determined by the error generated during measurement, and this error is caused by, for example, the limitations of the measurement system or process conditions. In addition, "about" can mean within one or more standard deviations of the above numerical values, such as ±30%, ±20%, ±10% or ±5%. The words "about", "approximately" or "substantially" that appear in this text can select an acceptable deviation range or standard deviation based on the optical properties, etching properties, mechanical properties or other properties, and not just one standard deviation can be applied to all properties such as the above optical properties, etching properties, mechanical properties and other properties.

[0044] Figure 1A is a schematic top view of a backlight module 100 according to at least one embodiment of the present invention. Figure 1B for Figure 1A The enlarged top view of the single-sided tape 170 is shown in FIG. Figure 1C for Figure 1A The cross-sectional view of the backlight module 100 is shown in FIG. Figures 1A to 1C The backlight module 100 includes a plurality of optical films, a single-sided tape 170 , an adhesive material 150 and at least two fixing posts 140 .

[0045] The optical films include a first optical film 110 and second optical films 120 and 130. The first optical film 110 covers the second optical films 120 and 130, that is, the second optical films 120 and 130 are covered under the first optical film 110 (eg, Figure 1C ), so it is not shown in Figure 1A and Figure 1B The fixing posts 140 are disposed around the optical films (the first optical film 110 and the second optical films 120 and 130).

[0046] See also Figure 1B Before the single-sided tape 170 covers and adheres to the edge regions 160 of the second optical films 120 and 130, the edge regions 160 of the second optical films 120 and 130 form lugs. The second optical film 120 is covered under the first optical film 110 (eg Figure 1C As shown), Figure 1B Only a portion of the lugs of the second optical film 130 are exposed. However, in other embodiments not shown, the first optical film 110 may not cover at least a portion of the edge region 160 of each of the second optical films 120 and 130, that is, a portion of the lugs of each of the second optical film 120 and the second optical film 130 are not covered by the first optical film 110 and are exposed.

[0047] The first optical film 110 may be a reflective polarized brightness enhancement film (Dual Brightness Enhancement Film, DBEF for short). The second optical films 120 and 130 may be common prism films, brightness enhancement films, condenser films, diffusion films, etc., which may be increased or decreased according to design requirements. In other embodiments, the number of second optical films is not limited to two, but may even be more. Figure 1C Quantity shown.

[0048] See also Figure 1C , the backlight module 100 may be a detection type backlight module, and further includes a light guide plate 210 and a light emitting element 250. The light guide plate 210 has a light emitting surface 220 and a side surface 230 connected to the light emitting surface 220, wherein at least two fixing columns 140 protrude from the light emitting surface 220. The light emitting element 250 is located on the side surface 230 of the light guide plate 210, wherein the side surface 230 is in a ring shape, and the side surface 230 surrounds the light emitting surface 220. Taking the present embodiment as an example, the side surface 230 of the light guide plate 210 has four planes, and the light emitting element 250 is located on one of the planes. There may be more than one light emitting element 250, and at least two light emitting elements 250 may be located on at least two planes of the side surface 230, but the invention is not limited thereto.

[0049] The first optical film 110 covers the second optical films 120 and 130, but does not cover at least a portion of the edge region 160 of at least one of the second optical films 120 and 130. For example, the first optical film 110 may not cover at least a portion of the edge region 160 of each second optical film 120 and 130 that is not adjacent to the first optical film 110. Figure 1CFor example, the second optical film 120 is adjacent to the first optical film 110 , while the second optical film 130 is not adjacent to the first optical film 110 , wherein the first optical film 110 completely covers the edge area 160 of the entire second optical film 120 , but does not cover at least a portion of the edge area 160 of the second optical film 130 .

[0050] The second optical films 120 and 130 may include at least one intermediate film (adjacent to the first optical film 110) and one bottom film (not adjacent to the first optical film 110). That is, the second optical films 120 and 130 may be divided into intermediate films and bottom films according to their positions. Figure 1C For example, the second optical film 120 is an intermediate film, and the second optical film 130 is a bottom film.

[0051] The edge region 160 of the middle film (i.e., the second optical film 120) forms a convex ear. The bottom film (i.e., the second optical film 130) is located below the middle film, wherein the middle film is located between the bottom film and the first optical film 110, and at least a portion of the edge region 160 of the bottom film is not covered by these middle films. In other undrawn embodiments, the second optical film includes not only the second optical film 120 and the second optical film 130, that is, the number of middle films is not only one, but even more, and it is not limited thereto.

[0052] The adhesive material 150 is connected between the edge region 160 of the first optical film 110 and the adjacent second optical film 120, 130. The recommended length of the adhesive material 150 attached to the first optical film 110 is 20 mm to 40 mm. The adhesive material 150 has two adhesive surfaces 152, and the adhesive material 150 can be a solid double-sided tape or a liquid adhesive. The liquid adhesive can be a heat-curing adhesive or a light-curing adhesive.

[0053] The single-sided tape 170 covers and adheres to the edge area 160 of each second optical film 120, 130. The recommended length of the single-sided tape 170 attached to each second optical film 120, 130 is 20mm to 40mm. The single-sided tape 170 has an adhesive surface 172 on one side and a non-adhesive surface 173 on the other side. The color of the single-sided tape 170 can be transparent, black, gray or white. A portion of the single-sided tape 170 is located between the first optical film 110 and the second optical film 120, rather than the single-sided tape 170 fully covering the edge area 160 of the first optical film 110 and each second optical film 120, 130. In this way, when the single-sided tape 170 is black, there will be a shadow problem in the viewing angle.

[0054] exist Figure 1CIn the embodiment, in two adjacent second optical films 120, 130 stacked on each other, the edge area 160 of the upper second optical film 120 covers the edge area 160 of the lower second optical film 130, but a portion of the edge area 160 of the lower second optical film 130 is not covered by the upper second optical film 120. However, the adhesive 150 or the single-sided tape 170 does not need to appear on the other side of the edge area 160 relative to the fixing column 140 to achieve the bonding and fixing on the light guide plate 210. At least two fixing columns 140 are each arranged on the left side and the right side of the middle and lower sides of these optical films (the first film 110 and the second optical films 120, 130). In other embodiments, the fixing columns 140 can be three, one each arranged on the left side, the middle and lower side, and the right side of these optical films, or even four, one each arranged on the four sides of these optical films or two each on two sides, but are not limited thereto.

[0055] Figure 1D FIG. 1 is a cross-sectional view of a backlight module 300 according to at least one embodiment of the present invention. Figure 1A and Figure 1B ) are similar or identical, so they are omitted here. Figure 1D A top view of the backlight module 300 is shown.

[0056] See also Figure 1D , Figure 1D The relative relationship between the optical film (the first optical film 110 and the second optical film 120, 130) of the backlight module 300, the single-sided tape 170, the adhesive material 150 and the at least two fixing posts 140 is as follows: Figure 1C Similar. However, the backlight module 300 is a direct-type backlight module. Specifically, the backlight module 300 further includes a housing 310. The housing 310 includes a frame 330 and a plurality of light-emitting elements 350. The frame 330 has a surface 340, wherein the optical films, namely the first optical film 110 and the second optical film 120, 130, and at least two fixing columns 140 are disposed on the surface 340. The light-emitting elements 350 are located inside the housing 310 and below the optical films, namely below the first optical film 110 and the second optical film 120, 130.

[0057] exist Figure 1D In the embodiment, in two adjacent second optical films 120 and 130 stacked on each other, the edge region 160 of the upper second optical film 120 covers the edge region 160 of the lower second optical film 130, but a portion of the edge region 160 of the lower second optical film 130 is not covered by the upper second optical film 120. However, the adhesive 150 or the single-sided tape 170 does not need to be present on the other side of the edge region 160 relative to the fixing column 140 in order to achieve adhesion and fixing to the die casting 320.

[0058] Figure 2A FIG. 4 is a schematic top view of a backlight module 400 according to another embodiment of the present invention. Figure 2B for Figure 2A FIG. 4 is a cross-sectional diagram of the backlight module 400 along the section line BB. Figure 2A and Figure 2B The backlight module 400 includes a plurality of optical films (not shown), a glue material 150 and at least two fixing posts 140. These optical films include a first optical film 410 and a plurality of second optical films 120, 130. The number of the second optical films is not limited to the second optical film 120 and the second optical film 130, but may be more. These second optical films 120, 130 are stacked on each other, wherein the first optical film 410 fully covers these second optical films 120, 130.

[0059] The adhesive 150 is connected between the edge regions 460 of the first optical film 410 and the second optical films 120 and 130. At least two fixing posts 140 are disposed around the optical films, namely, the first optical film 410 and the second optical films 120 and 130. Figure 2A In the embodiment, Figures 1A to 1D The number and arrangement rules of the fixing columns 140 also apply to Figure 2A and Figure 2B .

[0060] In summary, in at least one embodiment of the backlight module 100, 300 of the present invention, the edge area 160 and position of the optical film (the first optical film 110 and the second optical film 120, 130) are designed to be asymmetric, so that the single-sided tape 170 can be covered and attached to the edge area 160 of each second optical film 120, 130 at one time, which helps to reduce the consumption of the double-sided tape or double-sided adhesive material 150 during assembly.

[0061] Although the present application has been disclosed as above with various embodiments, it is not intended to limit the present application. The above summarizes the components of several embodiments so that those with ordinary knowledge in the technical field to which the present invention belongs can more easily understand the viewpoints of the inventive embodiments. Those with ordinary knowledge in the technical field to which the present invention belongs should understand that they can design or modify other processes and structures based on the embodiments of the present invention to achieve the same purpose and / or advantages as the embodiments introduced herein. Those with ordinary knowledge in the technical field to which the present invention belongs should also understand that such equivalent processes and structures do not deviate from the spirit and scope of the present invention, and they can make various changes, substitutions and replacements without violating the spirit and scope of the present invention, so the protection scope of the present application shall be determined by the scope of the attached patent application.

Claims

1. A backlight module, characterized in that: include: Multiple optical films, including: a first optical film; as well as A plurality of second optical films are stacked on each other, wherein the first optical film covers the second optical films but does not cover at least a portion of an edge region of at least one of the second optical films; A single-sided adhesive tape covers and adheres to the edge area of ​​each second optical film; An adhesive material connected between the edge region of the first optical film and the adjacent second optical film; and At least two fixing posts are arranged around the optical films.

2. The backlight module according to claim 1, wherein: A portion of the single-sided tape is located between the first optical film and the second optical films.

3. The backlight module according to claim 1, wherein: Among the two adjacent second optical films stacked on each other, the edge area of ​​the upper second optical film covers the edge area of ​​the lower second optical film, but a part of the edge area of ​​the lower second optical film is not covered by the upper second optical film.

4. The backlight module according to claim 1, wherein: The second optical films include: an intermediate diaphragm, wherein the edge region of the intermediate diaphragm forms a lug; and A bottom film is located below the middle film, wherein the middle film is located between the bottom film and the first optical film, and at least a portion of the edge region of the bottom film is not covered by the middle film.

5. The backlight module according to claim 1, wherein: The color of the single-sided adhesive tape is transparent, black, gray or white.

6. The backlight module according to claim 1, wherein: Two of the at least two fixing posts are respectively disposed on two opposite sides of the optical films.

7. The backlight module according to claim 1, wherein: Two of the at least two fixing columns are respectively disposed on two adjacent sides of the optical films.

8. The backlight module according to claim 1, wherein: It comprises three fixing columns, wherein one of the fixing columns is located between the other two fixing columns.

9. The backlight module according to claim 1, wherein: Also includes: A housing comprises: A frame having a surface, wherein the optical films and the at least two fixing posts are disposed on the surface; and A plurality of light emitting elements are located inside the housing and below the optical films.

10. The backlight module according to claim 1, wherein: Also includes: A light guide plate having a light emitting surface and a side surface connected to the light emitting surface, wherein the at least two fixing posts protrude from the light emitting surface; as well as A light emitting element is located on the side surface of the light guide plate.

11. A backlight module, characterized in that: include: Multiple optical films, including: a first optical film; and A plurality of second optical films are stacked on each other, wherein the first optical film fully covers the second optical films; An adhesive material connected between the first optical film and an edge region of each of the second optical films; and At least two fixing posts are arranged around the optical films.

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