TWI701485B - Backlight module and display device using the same - Google Patents

Abstract

The present disclosure provides a backlight module including a bracket, a light emission module, a reflective film, and a plurality of glue structures. The bracket includes a first plate, a second plate opposite to the first plate, and a third plate connecting the first plate and the second plate. The light emission module is disposed between the first plate and the second plate. The light emission module includes a plurality of light emission elements. The reflective film is disposed between the light emission module and the first plate and is adhered to the first plate of the bracket through the glue structures. The glue structures are vertically projected on the first plate at a plurality of first areas respectively, and the light emission elements are vertically projected on the first plate at a plurality of second areas respectively. The first areas do not overlap with the second areas.

Description

Backlight module and display device using the same

The disclosure relates to a backlight module and a display device.

Generally speaking, the parts of the edge-lit backlight module include light-emitting elements and light guide plates, and the light-emitting elements are mostly light emission diodes (LEDs). With the trend toward thinner and lighter products, the overall thickness of the backlight module also needs to be reduced. However, reducing the backlight module faces many practical difficulties. For example, the cost of reducing the size of LEDs is quite high. On the other hand, under the existing manufacturing process, after the size of the backlight module is reduced, it becomes more and more difficult to assemble. For example, the thickness of the glue attached to the bracket of the backlight module may prevent the LED from entering the bracket. With a thinner light guide plate, the size of the LED and the light guide plate will not match, and the difference between the two will cause light leakage from the backlight module.

The present disclosure provides a backlight module, which includes a bracket, a light-emitting module, a reflective sheet, and a plurality of first glues. The bracket includes a first plate body and a second plate body opposite to each other, and a third plate body connecting the first plate body and the second plate body. The light emitting module is arranged between the first board and the second board, and the light emitting module includes a plurality of light emitting elements. The reflection sheet is arranged between the light-emitting module and the first board, and the reflection sheet is adhered to the first board of the bracket through the first glue. The first gels are respectively vertically projected to a plurality of first regions of the first board, and the light-emitting elements are respectively vertically projected to a plurality of second regions of the first board. The first regions and the second regions do not overlap each other.

Another embodiment of the present disclosure is a display device using the above-mentioned backlight module.

In summary, the backlight module proposed in the present disclosure includes a bracket with a first board, a second board, and a third board connecting the first board and the second board, and the vertical projection through the first glue The position of the first plate of the bracket and the vertical projection of the light-emitting element to the first plate of the bracket are different, so that the thickness of the backlight module can be reduced, which is beneficial to the lightness and thinness of the display device.

10, 10’‧‧‧Display device

100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H‧‧‧Backlight module

110‧‧‧bracket

111‧‧‧First plate

112‧‧‧Second plate

113‧‧‧The third plate

120‧‧‧Lighting Module

121‧‧‧Circuit substrate

122‧‧‧Light-emitting element

122a‧‧‧Glossy surface

122b‧‧‧Top surface

130‧‧‧Reflective sheet

132‧‧‧Part One

134‧‧‧Part Two

136‧‧‧Part Three

138‧‧‧Part Four

140‧‧‧First colloid

150‧‧‧Air layer

160‧‧‧Air gap

170‧‧‧Light Guide Plate

170a‧‧‧Glossy surface

170b‧‧‧Glossy surface

180‧‧‧Second colloid

190‧‧‧Cushioning element

192‧‧‧Part One

194‧‧‧Part Two

200‧‧‧Reflective element

210‧‧‧Strip Set

212‧‧‧First strip

214‧‧‧Second tape

216‧‧‧The third strip

220‧‧‧Display Panel

A-A, B-B‧‧‧Line segment

A1‧‧‧First area

A2‧‧‧Second area

A3‧‧‧The third area

A4‧‧‧The fourth area

A5‧‧‧The fifth area

A6‧‧‧The sixth area

S‧‧‧zone

CH‧‧‧Channel

d1, d2, d3‧‧‧distance

g‧‧‧Segment difference

t1‧‧‧First thickness

t2‧‧‧Second thickness

t3‧‧‧The third thickness

w2‧‧‧Width

FIG. 1 is a perspective view of a backlight module according to an embodiment of the present disclosure.

Figure 2 shows a front view of the light-emitting surface facing the backlight module in Figure 1.

FIG. 3A is a top perspective view of the backlight module in FIG. 1 before being assembled.

FIG. 3B is a top perspective view of the backlight module in FIG. 1 after being assembled.

Fig. 4 is a perspective view of the backlight module in Fig. 1 after adding a light guide plate.

Figure 5A shows a cross-sectional view along the line A-A in Figure 4;

Figure 5B shows a cross-sectional view along the line B-B in Figure 4;

FIG. 6 is a cross-sectional view of a backlight module according to another embodiment of the disclosure.

7A and 7B are top perspective views of a backlight module before and after assembly according to another embodiment of the present disclosure.

Figures 8A and 8B are cross-sectional views taken along the lines A-A and B-B in Figure 7B, respectively.

9A and 9B are top perspective views of a backlight module before and after assembly according to still another embodiment of the present disclosure.

Figures 10A and 10B are cross-sectional views taken along the lines A-A and B-B in Figure 9B, respectively.

11A and 11B are top perspective views of a backlight module before and after assembly according to still another embodiment of the present disclosure.

Figures 12A and 12B are cross-sectional views along the lines A-A and B-B in Figure 11B, respectively.

13A and 13B are top perspective views of a backlight module before and after assembly according to another embodiment of the present disclosure.

Figures 14A and 14B are cross-sectional views taken along the lines A-A and B-B in Figure 13B, respectively.

15A and 15B are respectively cross-sectional views of a display device according to an embodiment of the present invention.

16A and 16B are respectively cross-sectional views of a display device according to another embodiment of the present invention.

Hereinafter, multiple embodiments of the present invention will be disclosed in the form of drawings. For clear description, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit the present invention. That is, in some embodiments of the present invention, these practical details are unnecessary. In addition, in order to simplify the drawings, some conventionally used structures and elements will be shown in a simple schematic manner in the drawings. Moreover, unless otherwise indicated, the same component symbols in different drawings can be regarded as corresponding components. The drawing of these drawings is to clearly express the connection relationship between the elements in these embodiments, and does not show the actual size of each element.

Please refer to Figure 1 and Figure 2. FIG. 1 is a perspective view of a backlight module 100A according to an embodiment of the present disclosure; and FIG. 2 is a front view of the light-emitting surface 122a facing the light emitting element 122 of the backlight module 100A in FIG. The backlight module 100A includes a bracket 110, a light emitting module 120, a reflective sheet 130, and a plurality of first glues 140. The bracket 110 includes a first plate 111, a second plate 112, and a third plate 113. The first plate 111 and the second plate 112 are opposite to each other, and the third plate 113 connects the first plate 111 and the third plate.二板体112。 Two board body 112. The light-emitting module 120 is disposed between the first board 111 and the second board 112, and the light-emitting module 120 may include a circuit substrate 121 and a plurality of light-emitting elements 122 disposed on the circuit substrate 121. The reflective sheet 130 is disposed between the light emitting module 120 and the first board 111. A plurality of first colloids 140 are disposed between the reflective sheet 130 and the first plate 111, wherein the first colloids 140 are respectively vertically projected to the plurality of first regions A1 of the first plate 111, and the light-emitting elements 122 are respectively It is vertically projected to a plurality of second areas A2 of the first plate 111, and the first area A1 and the second area A2 do not overlap each other. The first plate 111 of the bracket 110 is projected vertically through the first glue 140 and the light emitting element 122 is projected vertically to the first plate 111 of the bracket 110 at different positions, which can reduce the thickness of the backlight module 100A, which is beneficial to the lightness and thinness of the display device.化.

The light-emitting element 122 in the light-emitting module 120 may be disposed on the circuit substrate 121, and the circuit substrate 121 may be disposed between the light-emitting element 122 and the second board 112. In addition, the light-emitting element 122 may be interposed between the circuit substrate 121 and the reflective sheet 130. The circuit substrate 121 is electrically connected to the light-emitting element 122, and can control the brightness of the light-emitting element 122 through an external signal. In this embodiment, the circuit substrate 121 may be a flexible printed circuit board, and the light-emitting element 122 may be a light emission diode (LED), but it is not limited thereto.

As shown in FIGS. 1 and 2, in this embodiment, each light-emitting element 122 has a light-emitting surface 122a. The light emitting surface 122a is located on the side of the light emitting element 122 facing away from the third board 113. In this way, the light emitting element 122 can directly emit light from the inside of the bracket 110 to the outside. In some embodiments, a reflective material can be arranged or coated on the third board 113 to reflect at least part of the light emitted by the light-emitting element 122 toward the third board 113, so that the light emitted by the light-emitting element 122 is ultimately multi-energy. Eject from the direction away from the third board 113 in the bracket 110.

A reflecting sheet 130 extending outward is further provided on the surface of the first plate 111 facing the second plate 112, and the reflecting sheet 130 is adhered to the first plate 111 by a plurality of first glues 140. Due to problems caused by manufacturing tolerances, assembly tolerances, or component level differences, there may be a gap between the bracket 110 and the light guide plate 170 (as shown in FIG. 5A). By providing a reflective sheet 130 extending outward from the inner surface of the first plate body 111, it can be used as a connecting piece between components, which can prevent light from leaking out of the above-mentioned gap, and effectively solve the light leakage problem.

In this embodiment, the reflective sheet 130 has a very thin thickness, and therefore has flexibility as a whole. The flexible reflective sheet 130 can be more appropriately used as the connecting member between the bracket 110 and the light guide plate 170. In addition, the reflective sheet 130 may be made of a material with high reflectivity for the light emitted by the light emitting element 122. The reflective sheet 130 is made of a reflective material, such as barium sulfate (BaSO ₄ ), titanium dioxide (TiO ₂ ), silver (Ag), polypropylene (Polypeopylene, PP), cyclo-olefin polymers (COP) or its combination. In other embodiments, different materials can also be selected according to practical requirements, and this disclosure is not limited to the foregoing.

As shown in Figures 1 and 2, in this embodiment, the reflective sheet 130 can be pressed through the first gel 140, and the light-emitting module 120 located under the reflective sheet 130 can be further pressed, so that the light-emitting module 120 Fixed in the bracket 110. The first glue 140 may be various adhesive materials, for example, double-sided tape, foam tape, and the like.

As shown in FIG. 2, in each first area A1, there may be an air layer 150 between the reflective sheet 130 and the second plate 112. Furthermore, on the projection plane parallel to the first plate 111, the air layer 150 is located between every two most adjacent light-emitting elements 122.

In the direction perpendicular to the first plate 111, the thickness of the air layer 150 is smaller than the thickness of the light emitting element 122. Therefore, the reflective sheet 130 in the second area A2 will be pressed by the light-emitting element 122 and approach the first plate 111. In other words, if the reflection sheet 130 is separated from the first plate 111 by a distance d1 in the first area A1, and the reflection sheet 130 is separated from the first plate 111 by a distance d2 in the second area A2, the reflection sheet 130 is Under the squeeze of the light emitting element 122, the distance d2 will be smaller than the distance d1. In one embodiment, since the reflective sheet 130 is flexible, it exerts pressure on the light-emitting element 122 toward the second board 112 in the second area A2, and confines the light-emitting module 120 as a whole in the bracket 110 .

In this embodiment, on the plane projected to the first plate 111, the first colloid 140 and the light emitting element 122 are alternately arranged, that is, on the projection plane parallel to the first plate 111, each adjacent A first colloid 140 is arranged between the two light-emitting elements 122. In other words, two adjacent light-emitting elements 122 can be separated by an air layer 150, and the thickness of the air layer 150 is smaller than the thickness of the light-emitting element 122. In this way, the reflective sheet 130 can press down each light emitting element 122 to fix the light emitting module 120 in the bracket 110. Through this fixing method, the adhesive material between the light-emitting module 120 and the bracket 110 can be reduced, and the light-emitting module 120 can be installed in the bracket 110 more easily.

As shown in Fig. 2, on the projection plane parallel to the first plate 111, there is an interval S between the first area A1 and the second area A2. That is to say, on the projection plane parallel to the first plate 111, the light-emitting element 122 and the first glue 140 are not directly connected. In this embodiment, on the projection plane parallel to the first plate 111, the light-emitting element 122 and the first colloid 140 are separated by an air gap 160. A plurality of air gaps 160 are located between the first plate 111 and the reflective sheet 130, and the projection of each air gap 160 on the first plate 111 is located in the aforementioned interval S, that is, in parallel to the first plate 111 On the projection plane of, each air gap 160 is located between the nearest neighboring first area A1 and second area A2. The air gap 160 can be used as a buffer space when the light-emitting module 120 is assembled into the bracket 110, which facilitates the assembly operation.

Next, please refer to FIGS. 3A and 3B. FIG. 3A shows a top perspective view of the backlight module 100A in FIG. 1 before assembly, and FIG. 3B shows the backlight module 100A in FIG. In the top perspective view after assembly, the first gel 140 in FIG. 3A and FIG. 3B is marked with oblique lines in order to be more clearly labeled. In other words, after the light emitting module 120 in FIG. 3A is inserted into the bracket 110, it becomes the backlight module 100A shown in FIGS. 1 and 3B.

As shown in FIGS. 3A and 3B, in this embodiment, the first colloids 140 are vertically projected to the plurality of third areas A3 of the third board 113, and the light-emitting elements 122 are vertically projected to the third area A3. There are a plurality of fourth areas A4 of the board 113, and the third area A3 and the fourth area A4 do not overlap each other. That is to say, a channel CH connecting the third plate 113 and the outside of the bracket 110 is defined between the partial reflection sheet 130 that is not overlapped with two adjacent first gels 140 and the second plate 112 below it. In this way, when the light-emitting module 120 is to be fixed from the outside of the bracket 110 to the inside of the bracket 110, only the light-emitting elements 122 need to be aligned with the channels CH and pushed in the direction of the third board 113 instead of It is necessary to worry that the first glue 140 will jam the light-emitting element 122. In other words, except that the first plate 111 and the light emitting element 122 projected perpendicularly to the bracket 110 through the first colloid 140 are vertically projected to the first plate 111 of the holder 110 at different positions, the first plate 111 is projected perpendicularly to the holder 110 through the first colloid 140. The third board 113 and the light-emitting element 122 are projected perpendicularly to the third board 113 of the bracket 110 at different positions, which can avoid interference by the first glue 140 when the light-emitting element 122 is assembled.

As shown in Figures 3A and 3B, in this embodiment, each first gel 140 extends from the side of the reflective sheet 130 adjacent to the third plate 113 to the distance of the first plate 111 away from the third plate 113 Side. In other words, the first glue 140 completely fills the space between the reflective sheet 130 and the first plate 111 in a direction perpendicular to the third plate 113. In some embodiments, the first glue 140 only partially fills the space between the reflective sheet 130 and the first plate 111. For example, the first glue 140 may be located only on the side of the reflective sheet 130 adjacent to the third plate 113, only on the side of the first plate 111 away from the third plate 113, or located between the two. Those skilled in the art can change the position of the first colloid 140 according to practical requirements, and it is not limited to the above.

As shown in FIGS. 3A and 3B, the distance between the two adjacent ones of the first regions A1 is greater than the width of the individual second regions A2. That is, along the arrangement direction of the light-emitting elements 122 on the circuit substrate 121, there is a distance d3 between the two most adjacent first colloids 140, and the light-emitting element 122 has a width w2, where the distance d3 is greater than the width w2 . Those skilled in the art can adjust the size of the light-emitting element 122, the spacing of the light-emitting element 122 on the circuit substrate 121, and the width of the first gel 140 to change the distance d3 and the width w2 according to the requirements of the assembly process. The above is limited.

In the embodiments shown in FIG. 1, FIG. 2, FIG. 3A, and FIG. 3B, the shape of the first colloid 140 is shown as a rectangular parallelepiped. In various embodiments, the first colloid 140 may be hemispherical, semi-cylindrical, or other irregular shapes. Those skilled in the art can change the size and shape of the first colloid 140 according to practical requirements, and it is not limited to the above.

Next, please refer to FIG. 4, which shows a perspective view of the backlight module 100A in FIG. 1 after adding a light guide plate 170. In another embodiment of the present disclosure, in order to enable the light-emitting surface of the backlight module 100A to be properly connected to the external module, the backlight module 100A may further include a light guide plate 170. The light guide plate 170 is partially located between the first plate body 111 and the second plate body 112.

Please refer to Fig. 5A, which shows a cross-sectional view along the line A-A in Fig. 4. As shown in FIG. 5A, the light emitting surface 122 a of the light emitting element 122 may be adjacent to the light incident surface 170 a of the light guide plate 170. In this embodiment, the light guide plate 170 may have, for example, a microstructure, which can convert the light from the light-emitting element 122 into plane light, which is emitted from the light-emitting surface 170b of the light guide plate 170. In other embodiments, different principles and types of light guide plates can be used, and it is not limited to the above.

As shown in FIG. 5A, in the direction from the first plate 111 to the second plate 112, the light-emitting element 122 has a first thickness t1, and the light guide plate 170 has a second thickness t2, wherein the first thickness t1 may be greater than the first thickness t1. Two thickness t2. In this embodiment, since a thinner light guide plate 170 is used, it will contribute to the slimming of the backlight module 100A. In this embodiment, since the light guide plate 170 and the light emitting element 122 are both disposed on the circuit substrate 121, there may be a step difference between the top surface 122b of the light emitting element 122 away from the circuit substrate 121 and the light emitting surface 170b of the light guide plate 170 g, the step difference g is substantially equal to the difference between the first thickness t1 and the second thickness t2.

As shown in FIG. 5A, the reflective sheet 130 extends from the top surface 122 b of the light-emitting element 122 between the light guide plate 170 and the first plate 111, and further covers a part of the light-emitting surface 170 b of the light guide plate 170. Since there is a level difference g between the light-emitting element 122 and the light guide plate 170, the level difference g may also exist between the reflective sheet 130 located on the top surface 122b of the light-emitting element 122 and the reflective sheet 130 located on the light exit surface 170b of the light guide plate 170 . In this embodiment, the level difference g of the reflective sheet 130 is located near the boundary between the light guide plate 170 and the light emitting element 122. However, in other embodiments, the level difference g of the reflective sheet 130 may be located at other positions, which is not limited to the above. By making the reflective sheet 130 cover the top surface 122b of the light emitting element 122 and the light emitting surface 170b of the light guide plate 170, light can be prevented from overflowing and leaking from the light emitting surface 122a near the step g between the light emitting element 122 and the light guide plate 170, which is effective Solve the problem of light leakage.

Please refer to FIG. 5B, which shows a cross-sectional view along line B-B in FIG. 4. As shown in FIG. 5B, the reflective sheet 130 may be disposed between the first glue 140 and the light guide plate 170. In other words, the first glue 140 will press the reflective sheet 130 and further limit the light guide plate 170 below it, so that the light guide plate 170 will not easily be separated between the first plate body 111 and the second plate body 112 .

In this embodiment, the first gel 140 has a third thickness t3, and the third thickness t3 is substantially equal to the level difference g between the light-emitting element 122 and the light guide plate 170 (refer to Figure 5A) plus the second area A2 The distance d2 between the middle reflector 130 and the first plate 111 (refer to FIG. 2 or FIG. 5A). That is, the third thickness t3 is equal to the step difference g plus the distance d2. As shown in Figure 2, in the arrangement direction of the light-emitting elements 122, the above design will make the difference between the distance d1 (the third thickness t3) and the distance d2 equal to the step difference g (the third thickness t3 minus the distance d2 is equal to Segment difference g). In some embodiments, since the distance d2 is very small or close to 0, the step g can be directly used as the third thickness t3 of the first colloid 140 to achieve the effect of uniform pressure.

In some embodiments, a slightly elastic material may be used to make the first gel 140, and the third thickness t3 is slightly larger than the sum of the step g and the distance d2. In this way, the reflective sheet 130 can clamp the light guide plate 170 more firmly. In some embodiments, the third thickness t3 may be less than the distance d2 plus the step difference g. In this way, the light-emitting module 120 can be easily inserted into the bracket 110. Those skilled in the art can change the specific thickness of the first colloid 140 according to practical requirements, and it is not limited to the above.

Next, please refer to FIG. 6, which shows a cross-sectional view of a backlight module 100B according to another embodiment of the present disclosure. The section line corresponding to Fig. 6 can refer to the line segment B-B in Fig. 4, and its viewing angle is the same as that of Fig. 5B. The backlight module 100B is similar to the backlight module 100A shown in Figure 4, and a comparison with Figure 5B shows that the difference between the two is that the first glue 140 of the backlight module 100B is only located on the light guide plate 170 and the first plate The space between the bodies 111 does not extend beyond the light guide plate 170 to the third plate body 113. In such an embodiment, the first glue 140 presses the reflective sheet 130 and can be confined to the light guide plate 170 under the reflective sheet 130. The light guide plate 170 clamped between the first board 111 and the second board 112 will further restrict the light-emitting module 120 in the bracket 110 (for the relative position, refer to Figure 5A), and prevent the light-emitting module 120 from being separated from the bracket 110 It can also achieve the function of fixing the light-emitting module 120. In this embodiment, only a small amount of the first colloid 140 is used. In addition to saving materials, it can also reduce the risk of uneven coating when the first colloid 140 is made.

Please refer to FIGS. 7A, 7B, 8A, and 8B at the same time. FIGS. 7A and 7B show a top perspective view of a backlight module 100C before and after assembly according to another embodiment of the present disclosure, and FIGS. 8A and 8B Figure 8B is a cross-sectional view along the lines AA and BB in Figure 7B. To maintain the simplicity of the drawing, the first plate 111 of the bracket 110 is not shown in FIGS. 7A and 7B. The difference between the backlight module 100C of this embodiment and the backlight module 100A of FIG. 1 is that the backlight module 100C further includes a second gel 180 and a buffer element 190, and the rest is substantially the same as the backlight module 100A, so it is not Repeat. In this embodiment, the lower surface of the reflective sheet 130 (that is, the surface facing the second board 112) may be provided with a buffer element 190, and the buffer element 190 is fixed to the lower surface of the reflective sheet 130 through the second glue 180. The second adhesive 180 may be a double-sided tape or an adhesive layer to fix the cushioning element 190 on the lower surface of the reflective sheet 130 by bonding. The material of the second glue 180 may be the same or different from the material of the first glue 140, and the thickness of the second glue 180 may be equal to or slightly smaller than the thickness of the first glue 140.

In one embodiment, from the top view of the backlight module 100C, the shape of the buffer element 190 is substantially the same as the shape of the second gel 180, and both are continuous elongated structures. The buffer element 190 is disposed between the light-emitting element 122 and the third plate body 113 of the bracket 110, and the buffer element 190 abuts against the third plate body 113 and the light-emitting element 122, so that the light guide plate 170 is combined with the light-emitting module 120 and the bracket 110 After completion, the buffer element 190 can provide sufficient supporting force to make the light-emitting surface 122a of the light-emitting element 122 closely contact the light-incident surface 170a of the light guide plate 170, thereby improving the light utilization rate of the backlight module 100C.

The material of the buffer element 190 may be a polymer material. In one embodiment, the buffer element 190 is a material with a low thermal expansion coefficient to avoid thermal expansion and deformation due to long-term contact with the light-emitting element 122, thereby affecting the assembly accuracy of the backlight module 100C. In another embodiment, the buffer element 190 may be made of a material with high reflectivity or a reflective layer is coated on the surface of the buffer element 190, so that the reflectance of the buffer element 190 is greater than 90%. In this way, the light leaking from the light emitting element 122 and/or the light guide plate 170 can be reflected and utilized by the buffer element 190 again, which can effectively solve the problem of the dark area between the light emitting elements 122.

Next, please refer to FIGS. 9A, 9B, 10A, and 10B at the same time. FIGS. 9A and 9B show a top perspective view of a backlight module 100D before and after assembly according to another embodiment of the present disclosure, and FIGS. 10A and 9B Figure 10B is a cross-sectional view along the lines AA and BB in Figure 9B. To maintain the simplicity of the drawing, the first plate 111 of the bracket 110 is not shown in FIGS. 9A and 9B. The difference between the backlight module 100D of this embodiment and the backlight module 100A of FIG. 1 is that the backlight module 100D further includes a plurality of second gels 180 and a plurality of reflective elements 200, and the rest is substantially the same as the backlight module 100A. Therefore, I will not repeat it.

The second glue 180 is used to fix the reflective element 200 on the lower surface of the reflective sheet 130. The second adhesive 180 can be a double-sided tape or an adhesive layer, and the reflectivity of the reflective element 200 is greater than 90%. The second colloid 180 and the reflective element 200 are arranged between the light-emitting elements 122 in sections. In other words, the second glue 180 and the reflective element 200 are disposed between the first glue 140 and the third board 113 of the bracket 110, but not between the light-emitting element 122 and the third board 113 of the bracket 110. In this way, the light leaked from the light emitting element 122 and/or the light guide plate 170 can be reflected by the reflective element 200 to the light guide plate 170 again, which can effectively solve the problem of the dark area between the light emitting elements 122 and improve the utilization of light.

Next, please refer to FIGS. 11A, 11B, 12A, and 12B at the same time. FIGS. 11A and 11B show a top perspective view of a backlight module 100E before and after assembly according to still another embodiment of the present disclosure, and FIGS. 12A and 12B Figure 12B is a cross-sectional view along the lines AA and BB in Figure 11B. To maintain the simplicity of the drawing, the first plate 111 of the bracket 110 is not shown in FIGS. 11A and 11B. The difference between the backlight module 100E of this embodiment and the backlight module 100A in FIG. 1 is that the backlight module 100E further includes a second gel 180 and a buffer element 190, and the rest is substantially the same as the backlight module 100A, so it will not be repeated here. .

The second glue 180 is used to fix the buffer element 190 on the lower surface of the reflective sheet 130. The second glue 180 can be a double-sided tape or an adhesive layer. In this embodiment, the second gel 180 is elongated, and the buffer element 190 has a elongated first portion 192 and a plurality of second portions 194 protruding from the first portion 192. The second portion 194 extends from the first portion 192 to the The first colloid 140 extends, and the second part 194 is distributed between the light emitting elements 122.

In other words, the first portion 192 of the buffer element 190 is disposed between the light-emitting element 122 and the third plate 113 of the bracket 110, and abuts against the light-emitting element 122 and the third plate 113 of the bracket 110 to provide sufficient supporting force. The light-emitting surface 122a of the light-emitting element 122 closely contacts the light-incident surface 170a of the light guide plate 170. The second part 194 of the buffer element 190 is disposed between the light guide plate 170 and the third plate body 113 of the bracket 110. In one embodiment, the second portion 194 of the buffer element 190 can abut against the light guide plate 170 and the third plate body 113 of the bracket 110 to avoid excessive compression during assembly of the light guide plate 170 and damage to the light emitting element 122.

In other embodiments, the buffer element 190 can be made of a material with high reflectivity or a reflective layer is coated on the surface of the buffer element 190, so that the reflectivity of the buffer element 190 is greater than 90%. In this way, the light leaking from the light emitting element 122 and/or the light guide plate 170 can be reflected and utilized by the buffer element 190 again, which can effectively solve the problem of the dark area between the light emitting elements 122. In one embodiment, there may be a gap between the second portion 194 of the buffer element 190 with high reflectivity and the light guide plate 170. This gap is not only used as a margin for assembly, but also allows light to be fully contained in the gap. The light is reflected by the buffer element 190 with high reflectivity, thereby improving the utilization of light.

Please refer to FIGS. 13A, 13B, 14A, and 14B at the same time. FIGS. 13A and 13B show a top perspective view of a backlight module 100F before and after assembly according to another embodiment of the present disclosure, and FIGS. 14A and 14B Figure 14B is a cross-sectional view along the lines AA and BB in Figure 13B. To maintain the simplicity of the drawing, the first plate 111 of the bracket 110 is not shown in FIGS. 13A and 13B. The difference between the backlight module 100E of this embodiment and the backlight module 100A in FIG. 1 is that the backlight module 100F further includes a second gel 180, a plurality of buffer elements 190, and a plurality of reflective elements 200, and the remaining part is roughly the same as the backlight module. The module 100A is the same, so it will not be repeated here.

The second glue 180 is a long double-sided tape or an adhesive layer for fixing the buffer element 190 and the reflective element 200 on the lower surface of the reflective sheet 130. The buffer element 190 may be made of a polymer material with a low thermal expansion coefficient, and the reflectance of the reflective element 200 is greater than 90%. The buffer element 190 and the reflection element 200 are arranged in sections and alternately along the second gel 180. For example, the projections of the light emitting element 122 and the first gel 140 on the second board 112 do not overlap, and the projections of the buffer element 190 and the reflective element 200 on the second board 112 do not overlap. The buffer element 190 is disposed between the light-emitting element 122 and the third board 113, and abuts against the light-emitting element 122 and the third board 113, so as to provide sufficient supporting force for the light-emitting surface 122a of the light-emitting element 122 and the light guide plate 170 to enter. The smooth surface 170a is in close contact. The reflective element 200 is disposed between the first gel 140 and the third board 113 and between the light-emitting elements 122. In this way, the light leaked from the light emitting element 122 and/or the light guide plate 170 can be reflected by the reflective element 200 to the light guide plate 170 again, which can effectively solve the problem of the dark area between the light emitting elements 122 and improve the utilization of light.

Referring to FIG. 15A and FIG. 15B, which are cross-sectional views of the display device 10 according to an embodiment of the present invention, the cross-sectional positions are the same as the aforementioned line segments A-A and B-B. In this embodiment, the display device 10 includes a display panel 220 disposed on the backlight module 100G. The display panel 220 may be a liquid crystal display panel, but is not limited to this. In other embodiments, the display panel 220 is also It may be, for example, a self-luminous display panel or an electrophoretic display panel. The reflective sheet 130 of the backlight module 100G is further folded between the bracket 110 and the display panel 220 to serve as a bearing surface when the display panel 220 is fixed, so as to improve the support of the display panel 220 against the bracket 110, and The difficulty of rework of the display device 10, such as separating the display panel 220 from the bracket 110, is reduced.

For example, the reflective sheet 130 includes a first part 132 disposed on the light-emitting element 122 and the light guide plate 170, a second part 134 disposed between the bracket 110 and the display panel 220, and a connection between the first part 132 and the second part 134 The third part 136. The display device 10 further includes a rubber strip group 210, and the rubber strip group 210 includes a first rubber strip 212 and a second rubber strip 214. The second adhesive strip 214 can be attached to the outer side of the second part 134 of the reflective sheet 130, that is, compared to the first adhesive strip 212, the second adhesive strip 214 is closer to the third plate body 113 of the bracket 110 , But not limited to this. In this embodiment, the first adhesive strip 212 and the second adhesive strip 214 are double-sided adhesive tapes as an example, but not limited to this. For example, they may be coated strip-shaped adhesive layers.

The first adhesive strip 212 is adhered to the bottom surface of the display panel 220, and the second adhesive strip 214 is adhered to the first plate 111 of the bracket 110. In addition, in this embodiment, the second portion 134 of the reflective sheet 130 is on two opposite surfaces adhered to the first adhesive strip 212 and the second adhesive strip 214, respectively. The first adhesive strip 212 is vertically projected to the fifth area A5 on the first plate 111 of the bracket 110, the second adhesive strip 214 is vertically projected to the sixth area A6 on the first plate 111 of the bracket 110, and the fifth area A5 is staggered in the sixth area A6. That is, the first rubber strip 212 and the second rubber strip 214 are arranged side by side but do not overlap each other to form a gap between the two, and the second part 134 of the reflective sheet 130 passes through the first rubber strip 212 and the second rubber strip 214 The gap between.

Accordingly, the first adhesive strip 212 is adhered to the bottom surface of the display panel 220, and directly or indirectly penetrates the second portion 134 of the reflective sheet 130 to abut the support 110, and because the reflective sheet 130 itself is not adhesive, the first adhesive strip 212 does not stick to the bracket 110. Similarly, the second adhesive strip 214 is adhered to the bracket 110 and directly or indirectly penetrates the second portion 134 of the reflective sheet 130 to abut the bottom surface of the display panel 220, and since the reflective sheet 130 itself is not adhesive, the second adhesive The strip 214 does not adhere to the bottom surface of the display panel 220.

With this design, the first adhesive strip 212, the second adhesive strip 214, and the second portion 134 of the reflective sheet 130 can jointly form a plane supporting the display panel 220, so the jointly formed plane cross-sectional width will be smaller than that of a single first adhesive strip The width of the 212 or the second adhesive strip 214 can provide a stable and sufficient support state for the display panel 220. At the same time, since the first adhesive strip 212 and the second adhesive strip 214 are respectively attached to the bottom surface of the display panel 220 and the bracket 110, the bottom surface of the display panel 220 is not directly bonded to the bracket 110, and the display panel 220 can be It is easier to separate from the bracket 110, which improves the convenience and success rate of heavy work. In addition, since the first adhesive strip 212 and the second adhesive strip 214 can be pre-bonded to the second part 134 of the reflective sheet 130, the assembly can be completed in one process during assembly, which saves man-hours.

In this embodiment, the first glue 140 is disposed between the first plate 111 of the bracket 110 and the first portion 132 of the reflective sheet 130, but does not overlap the light-emitting element 122. A buffer element or a reflective element (not shown in the figure) may be selectively provided between the light-emitting element 122 and the third plate body 113 of the bracket 110 or between the light guide plate 170 and the third plate body 113 of the bracket 110, In order to make the light emitting element 122 tightly abut the light guide plate 170 and improve the light utilization rate of the light emitting element 122.

Refer to FIG. 16A and FIG. 16B, which are respectively cross-sectional views of a display device 10' according to another embodiment of the present invention, and the cross-sectional positions are the same as the aforementioned line segments A-A and B-B. In this embodiment, the display device 10' includes a display panel 220 disposed on the backlight module 100H. The difference between the display device 10 of this embodiment and the display device 10' of FIGS. 15A and 15B is that the reflective sheet 130 is more The third plate body 113 extends to the bracket 110 and is fixed on the bracket 110 by a third rubber strip 216.

In this embodiment, the adhesive strip set 210 further includes a third adhesive strip 216, which may be, but is not limited to, a double-sided adhesive tape, which is disposed and adhered to the outer surface of the third board 113 of the bracket 110. The reflective sheet 130 further includes a fourth portion 138. The fourth portion 138 extends from the second portion 134 to the outside of the bracket 110 and is folded back on the third plate body 113. The reflective sheet is fixed by the adhesiveness of the third adhesive strip 216 The fourth part 138 of the 130 is adhered to the third plate 113 of the bracket 110. A buffer element or a reflective element (not shown in the figure) may be selectively provided between the light-emitting element 122 and the third plate body 113 of the bracket 110 or between the light guide plate 170 and the third plate body 113 of the bracket 110, In order to make the light emitting element 122 tightly abut the light guide plate 170 and improve the light utilization rate of the light emitting element 122. According to this design, in addition to reducing the difficulty of separating the display panel 220 from the bracket 110, the fixability between the reflective sheet 130, the bracket 110 and the display panel 220 can be improved.

In summary, in the backlight module proposed in the present disclosure, the colloid and the light-emitting element are staggered inside the bracket and do not overlap each other, so the thickness of the backlight module is reduced, which conforms to the current trend of thinning products.

The present disclosure has been described with examples and the above-mentioned embodiments, and it should be understood that the present invention is not limited to the disclosed embodiments. On the contrary, the present invention covers a variety of alterations and similar arrangements (for example, those generally known to those skilled in the art). Therefore, additional claims should be based on the broadest interpretation to cover all such changes and approximate arrangements.

100A‧‧‧Backlight Module

110‧‧‧bracket

111‧‧‧First plate

112‧‧‧Second plate

113‧‧‧The third plate

120‧‧‧Lighting Module

121‧‧‧Circuit substrate

122‧‧‧Light-emitting element

122a‧‧‧Glossy surface

130‧‧‧Reflective sheet

140‧‧‧First colloid

150‧‧‧Air layer

160‧‧‧Air gap

A1‧‧‧First area

A2‧‧‧Second area

S‧‧‧zone

d1、d2‧‧‧distance

Claims (21)

A backlight module includes: a bracket, including a first board and a second board opposite to each other, and a third board connecting the first board and the second board; a light emitting module, Is arranged between the first board and the second board, and the light-emitting module includes a plurality of light-emitting elements; a reflective sheet is arranged between the light-emitting module and the first board; and a plurality of A glue, the reflective sheet is adhered to the first plate of the bracket through the first glues, wherein the first glues are respectively vertically projected to a plurality of first areas of the first plate, and the light-emitting elements They are respectively vertically projected to a plurality of second regions of the first board, and the first regions and the second regions do not overlap each other. The backlight module according to claim 1, wherein the first gels are respectively vertically projected to a plurality of third regions of the third board, and the light-emitting elements are respectively vertically projected to a plurality of third areas of the third board. Four regions, and the third regions and the fourth regions do not overlap each other. The backlight module according to claim 1, wherein on a projection plane parallel to the first board, the first colloids and the light-emitting elements are alternately arranged. The backlight module according to claim 1, wherein the distance between the two adjacent ones of the first regions is greater than the width of the individual second regions. The backlight module according to claim 1, wherein there are a plurality of air gaps between the first plate and the reflective sheet, and each of the air gaps is located at the most phase on a projection plane parallel to the first plate. Adjacent to the first area and the second area. The backlight module of claim 1, wherein there are a plurality of air layers between the second plate and the reflective sheet, and on a projection plane parallel to the first plate, each of the air layers is located on the Between the two most adjacent light-emitting elements. The backlight module according to claim 1, wherein the distance between the reflective sheet and the first plate in the first regions is greater than the distance between the reflective sheet and the first plate in the second regions. The backlight module according to claim 1, further comprising: a light guide plate partially located between the first plate body and the second plate body. The backlight module according to claim 8, wherein the reflective sheet is disposed between the light guide plate and the first glue. The backlight module according to claim 8, wherein each of the light-emitting elements has a first thickness, the light guide plate has a second thickness, and the first thickness is greater than the second thickness. The backlight module according to claim 10, wherein a thickness of one of the first gels is substantially the same as the difference between the first thickness and the second thickness. The backlight module according to claim 8, wherein a thickness of the first gels is substantially the same as a difference between a top surface of the light-emitting element and a light-emitting surface of the light guide plate. The backlight module according to claim 1, wherein the light-emitting module further comprises a circuit substrate, the light-emitting elements are disposed on the circuit substrate, and the circuit substrate is between the light-emitting elements and the second board Between the body. The backlight module according to claim 13, wherein the light-emitting elements are between the circuit substrate and the reflective sheet. The backlight module according to claim 1, further comprising: at least one buffer element disposed between the third board of the bracket and the light-emitting elements; and at least one second glue to fix the buffer element to The reflective sheet. The backlight module according to claim 8, further comprising: a plurality of reflective elements, which are arranged between the third plate of the bracket and the light guide plate, and are respectively located between the light-emitting elements; and at least one Two glues are used to fix the reflective elements on the reflective sheet. The backlight module according to claim 16, further comprising: a plurality of buffer elements, which are arranged between the third board of the bracket and the light-emitting elements, and are respectively located between the reflective elements. The backlight module according to claim 1, further comprising: a reflective element, including a first part disposed between the third plate of the bracket and the light-emitting elements, and the first part to the first part A plurality of second parts extending from a colloid, the second parts of the reflecting element are located between the light emitting elements; and at least one second colloid, fixing the reflecting element to the reflecting sheet. A display device, comprising: a display panel; the backlight module according to any one of claims 1 to 18, wherein the reflective sheet includes a first part arranged on the light-emitting elements, arranged on the support and the display A second part between the panels, and a third part connecting the first part and the second part; and a rubber strip group for positioning the display panel on the backlight module, wherein the rubber strip group includes : A first adhesive strip for bonding the display panel and the second part of the reflection sheet; and a second adhesive strip for bonding the second part of the reflection sheet and the first plate of the bracket. The display device according to claim 19, wherein the vertical projection of the first rubber strip on the fifth area of the bracket is staggered from the vertical projection of the second rubber strip on the sixth area of the bracket. The display device according to claim 19, wherein the reflective sheet further includes a fourth part extending from the second part, and the adhesive strip set further includes a fourth part adhering to the third plate of the bracket One third strip.

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