TWI525371B - Backlight module - Google Patents

Description

Backlight module

The invention relates to a backlight module, and in particular to a backlight module of a display device.

A liquid crystal display device is a display device which is currently quite popular. A liquid crystal display device usually includes a liquid crystal panel and a backlight module. More specifically, the liquid crystal panel is disposed in the backlight module, and the backlight module can provide light to the liquid crystal panel, so that the user can view the screen displayed by the liquid crystal panel.

In a typical backlight module, the backlight module is framed in a frame, and the frame may be provided with an optical film such as a cymbal. The frame may have a stud thereon and the optical diaphragm has a hole. The optical film can be placed on the stud by its holes. In this way, the optical film can be fixed to the frame.

However, in the above backlight module, the junction of the stud and the hole easily forms an over-bright or over-dark pattern different from the surrounding brightness, and affects the light-emitting effect.

In view of the above, one of the objects of the present invention is to eliminate the over-brightness formed by the combination of the pillars of the frame and the holes of the optical film in the backlight module. Pattern or over-dark pattern.

In order to achieve the above objective, a backlight module includes a frame, at least one optical film, and a light source module according to an embodiment of the present invention. The frame comprises a frame and at least one protrusion, and the frame surrounds an opening. The upper surface of the frame has a plurality of inclined faces. The stud is disposed above one of the inclined faces. The optical film is sleeved on the stud and covers the opening. The optical film has a bottom surface, a portion of the bottom surface faces the inclined surface, and a vertical distance from the inclined surface to the bottom surface increases toward the opening. The light source module is disposed under the optical film and the frame.

In the above embodiment, since the stud is disposed on the inclined surface and the inclined surface is inclined toward the bottom surface and opposite to the bottom surface, when the light from the light source module reaches the inclined surface, the inclined surface can direct the light toward the optical film. Reflecting, thereby increasing the amount of light emitted from the junction of the stud and the optical film to eliminate the over-dark pattern at the junction of the stud and the optical film.

According to another embodiment of the present invention, a backlight module includes a frame, at least one protrusion, at least one optical film, and a light source module. The frame has a frame. The frame has at least one inclined surface and surrounds an opening. The stud system is disposed on the inclined surface. The stud has an inner side wall and an outer side wall. The inner side wall is closer to the opening than the outer side wall. The cross-sectional width of the studs is not equal from top to bottom. The optical film is sleeved on the stud and covers the opening. The optical film has a bottom surface. At least a portion of the inner sidewall is inclined relative to the bottom surface. The light source module is disposed on the optical film below the frame.

In the above embodiment, since the inner side wall of the stud is inclined with respect to the bottom surface of the optical film, the inner side wall and the bottom surface of the optical film are defined. The angle may be an acute angle or an obtuse angle. When the angle between the inner side wall of the stud and the bottom surface of the optical film is an acute angle, the inner side wall can reflect the light toward the optical film, thereby increasing the amount of light emitted from the junction of the stud and the optical film to eliminate the convexity. An over-dark pattern at the junction of the pillar and the optical film; in contrast, when the angle between the inner sidewall of the pillar and the bottom surface of the optical film is an obtuse angle, the inner sidewall reflects light back toward the optical film, thereby The amount of light emitted from the junction of the stud and the optical film is reduced to eliminate the over-bright pattern at the junction of the stud and the optical film.

The above description is only for explaining the problems to be solved by the present invention, the technical means for solving the problems, the effects thereof, and the like, and the specific details of the present invention will be described in detail in the following embodiments and related drawings.

100‧‧‧Frame

101‧‧‧ openings

110‧‧‧ frame

111, 111a, 111b‧‧‧ first inclined surface

112, 112a, 112b‧‧‧ second inclined surface

113‧‧‧Slope Turning Department

120‧‧‧ side frame

130‧‧‧Top frame

200, 200a, 200b, 200c, 200d, 200e, 200f‧‧‧ studs

201‧‧‧ side wall

201a, 201b, 201c, 201d, 201e, 201f‧‧‧ inner side wall

202a, 202d‧‧‧ outer side wall

300‧‧‧Optical diaphragm

301‧‧‧ bottom

302‧‧‧ top surface

303, 303a‧‧‧through holes

400, 400a‧‧‧ light source module

410, 410a‧‧‧ light source

420‧‧‧Light guide

420a‧‧‧Diffuser

422, 422a‧‧‧ into the glossy surface

424, 424a‧‧‧ shiny surface

N‧‧‧ normal direction

H‧‧‧Vertical distance

S‧‧‧ accommodating space

α, β‧‧‧ angle

The above and other objects, features, advantages and embodiments of the present invention will become more apparent and understood. The description of the drawings is as follows: FIG. 1 is a top view of a backlight module according to an embodiment of the present invention; 1 is a cross-sectional view of the backlight module taken along line A-A'; FIG. 3 is a partial cross-sectional view of the backlight module according to another embodiment of the present invention; A partial cross-sectional view of a frame according to an embodiment of the present invention; and a fifth partial cross-sectional view of the frame according to another embodiment of the present invention; FIG. 6 is a partial cross-sectional view of a backlight module according to another embodiment of the present invention; FIG. 7 is a partial cross-sectional view of the frame according to another embodiment of the present invention; A partial cross-sectional view of a frame according to another embodiment of the present invention; FIG. 9 is a partial cross-sectional view of a backlight module according to another embodiment of the present invention; and FIG. 10 is a partial cross-sectional view of the frame according to another embodiment of the present invention. Figure 11 and Figure 11 are partial cross-sectional views of a frame in accordance with another embodiment of the present invention.

The embodiments of the present invention are disclosed in the following drawings, and for the purpose of clarity However, it should be understood by those skilled in the art that the details of the invention are not essential to the details of the invention. In addition, some of the conventional structures and elements are shown in the drawings in a simplified schematic manner in order to simplify the drawings.

FIG. 1 is a top plan view of a backlight module according to an embodiment of the invention. 2 is a cross-sectional view of the backlight module of FIG. 1 taken along line A-A'. As shown in FIGS. 1 and 2, in the present embodiment, the backlight mode The set may include a frame 100, an optical film 300, and a light source module 400. The frame 100 includes a frame 110 and a stud 200. The frame 110 has an opening 101, and the upper surface of the frame 110 has a first inclined surface 111, and the plurality of protrusions 200 are disposed on the first inclined surface 111. The optical film 300 is sleeved on the stud 200, and the optical film 300 covers the opening 101. The light source module 400 is disposed under the frame 100 and at least partially exposed to the opening 101 and under the optical film 300. The optical film 300 has a bottom surface 301, and a portion of the bottom surface 301 faces the first inclined surface 111. The first inclined surface 111 is inclined with respect to the bottom surface 301, and further, the vertical distance H between the first inclined surface 111 to the bottom surface 301 is gradually increased toward the opening 101.

In the above embodiment, since the stud 200 is disposed on the first inclined surface 111 and the first inclined surface 111 is inclined toward the bottom surface 301 of the optical film 300 and inclined with respect to the bottom surface 301, when the light source module is used When a part of the light of 400 reaches the first inclined surface 111, the first inclined surface 111 can reflect the light toward the optical film 300, thereby increasing the amount of light emitted by the junction of the protrusion 200 and the optical film 300, so as to avoid the protrusion 200 and The brightness at the junction of the optical film 300 is too low.

In some embodiments, as shown in FIG. 2, the upper surface of the frame 110 further has a second inclined surface 112. The second inclined surface 112 is adjacent to the first inclined surface 111 , and the second inclined surface 112 is located between the first inclined surface 111 and the opening 101 . In other words, the frame 100 has a first inclined surface 111 and a second inclined surface 112 that are sequentially adjacent, and the first inclined surface 111 is away from the opening 101 with respect to the second inclined surface 112. The second inclined surface 112 faces the bottom surface 301 of the optical film 300 and is also inclined with respect to the bottom surface 301. So, no Only the first inclined surface 111 can reflect the light from the light source module 400 toward the optical film 300, and the second inclined surface 112 can also reflect the light from the light source module 400 toward the optical film 300, thereby improving the backlight module. Light effect. In some embodiments, the slopes of the first inclined surface 111 and the second inclined surface 112 may not be equal. For example, the slope of the second inclined surface 112 may be greater than the slope of the first inclined surface 111, and the slope turning portion 113 is formed between the first inclined surface 111 and the second inclined surface 112. When the difference in slope between the first inclined surface 111 and the second inclined surface 112 is small, the difference in luminance between the left and right sides of the slope turning portion 113 is smaller, so that the light output of the backlight module is more uniform.

In some embodiments, as shown in FIG. 2, the stud 200 is not perpendicularly connected to the first inclined surface 111 of the frame 100. Specifically, the stud 200 has a side wall 201. The side wall 201 of the stud 200 is connected to the first inclined surface 111 of the frame 100, and the side wall 201 is not perpendicular to the first inclined surface 111. In other words, the first inclined surface 111 is inclined with respect to the side wall 201 of the stud 200. In addition, the sidewall 201 of the stud 200 is substantially perpendicular to the bottom surface 301 of the optical film 300.

In this way, when the optical film 300 is sleeved on the stud 200, the bottom surface 301 of the optical film 300 and the first inclined surface 111 of the frame 110 can be separated by a gap for the light to pass through the gap to reach the first An inclined surface 111 is reflected by the first inclined surface 111 toward the optical film 300.

In some embodiments, as shown in FIG. 2, the optical film 300 has a top surface 302 and a through hole 303. The bottom surface 301 is opposite to the top surface 302, and the through hole 303 extends between the bottom surface 301 and the top surface 302. Optics The diaphragm 300 can be sleeved on the stud 200 by the through hole 303. Further, the stud 200 can be inserted into the through hole 303 from the bottom surface 301 and pass through the through hole 303 from the top surface 302 to lay the optical film 300 thereon. In some embodiments, the cross-sectional area of the through hole 303 and the cross-sectional area of the stud 200 may be substantially equal, so that the stud 200 closely abuts the hole wall of the through hole 303 to prevent the optical film 300 from being opposite to the stud. The 200 moves to facilitate fixing the optical film 300.

In some embodiments, as shown in FIG. 2, the light source module 400 is a side-entry light source. Specifically, the light source module 400 can include a light source 410 and a light guide plate 420. The light guide plate 420 is at least partially exposed to the opening 101 and is located below the optical film 300. The light source 410 is located on one side of the light guide plate 420 and is sandwiched between the frame 100 and the light guide plate 420 without being exposed to the opening 101. Further, the light guide plate 420 may have a light incident surface 422 and a light exit surface 424. The light incident surface 422 and the light exit surface 424 are adjacent to each other. The light exit surface 424 is at least partially exposed to the opening 101, and the light source 410 is located in the inlet. Next to the glossy side 422.

In this way, when the light source 410 is activated, it can emit light, and the light can enter the light guide plate 420 from the light incident surface 422 of the light guide plate 420, and pass through the light exit surface 424 to the opening 101, and then enter the optical film 300. in.

In some embodiments, as shown in FIG. 2 , a part of the frame 100 surrounds the light source module 400 to limit the light source module 400 therein, and the light source module 400 is prevented from moving arbitrarily. Specifically, the frame 110 of the frame 100 may include a side frame 120. The side frame 120 surrounds the light guide plate 420 , and the light source 410 is located between the side frame 120 and the light guide plate 420 . in other words, The side frame 120 surrounds the accommodating space S, and the light source 410 and the light guide plate 420 are accommodated in the accommodating space S. In this way, the side frame 120 can limit the light source 410 and the light guide plate 420 to the accommodating space S.

In some embodiments, the frame 110 further includes a top frame 130. The top frame 130 is disposed on the side frame 120. The top frame 130 covers the light source 410 and a portion of the light guide plate 420. The first inclined surface 111 and the second inclined surface 112 are upper surfaces of the top frame body 130, and the opening 101 is surrounded by the top frame body 130. Thereby, the top frame 130 can shield the light source 410 and a portion of the light in the light guide plate 420 enters the optical film 300 through the opening 101.

In some embodiments, the optical film 300 may comprise a crepe sheet, a brightness enhancing film or other optical film, but the invention is not limited thereto. In some embodiments, the light source 410 may include a light emitting diode, but the invention is not limited thereto.

3 is a partial cross-sectional view of a backlight module according to another embodiment of the present invention. As shown in FIG. 3, the main difference between the embodiment and the embodiment shown in FIG. 2 is that the light source module 400a of the present embodiment is a direct type light source. Specifically, the light source module 400a may include a light source 410a and a diffusion plate 420a, and the light source module 400a is located below the optical film 300, and the diffusion plate 420a is at least partially located between the light source 410a and the optical film 300. Furthermore, the diffuser plate 420a may have a light incident surface 422a and a light exit surface 424a. The light incident surface 422a and the light exit surface 424a are opposite to each other. The light source 410a is disposed on the light incident surface 422a, and the light exit surface 424a is directed toward the optical film. 300.

In this way, when the light source 410a is activated, it can emit light. The light can enter the diffusing plate 420a from the light incident surface 422a. The diffusing plate 420a can scatter the light to make the light distribution more uniform. The scattered light can pass through the diffusing plate 420a through the light emitting surface 424a and enter through the opening 101. In the optical film 300.

In some embodiments, the light source 410a may be located below the opening 101 without being covered by the top frame 130, so that the light of the light source 410a passes directly through the light incident surface 422a and the light exit surface 424a, and passes out of the diffuser plate 420a. In some embodiments, the light source 410a may be a light emitting diode, but the invention is not limited thereto.

In the above embodiment, the first inclined surface 111 and the second inclined surface 112 may be flat, but the invention is not limited thereto. Specifically, referring to FIG. 4, this figure illustrates a partial cross-sectional view of a frame 100 in accordance with an embodiment of the present invention. As shown in FIG. 4, the first inclined surface 111a includes a curved surface, and the curved surface is a convex curved surface (that is, a convex curved surface). Similarly, the second inclined surface 112a may also include a curved surface, and the curved surface is also a convex curved surface. In some embodiments, only the first inclined surface 111a may include a convex curved surface, and the second inclined surface 112a does not include a convex curved surface. In some embodiments, only the second inclined surface 112a may include a convex curved surface, and the first inclined surface 111a does not include a convex curved surface. In some embodiments, the first inclined surface 111a and the second inclined surface 112a may each include a convex curved surface.

Figure 5 is a partial cross-sectional view of a frame 100 in accordance with another embodiment of the present invention. As shown in FIG. 5, in some embodiments, the first inclined surface 111b may include a curved surface, and the curved surface is a concave curved surface (that is, a concave curved surface). Similarly, the second inclined surface 112b may also include a curved surface, and the curved surface It is also a concave curved surface. In some embodiments, only the first inclined surface 111b may include a concave curved surface, and the second inclined surface 112b does not include a concave curved surface. In some embodiments, only the second inclined surface 112b may include a concave curved surface, and the first inclined surface 111b does not include a concave curved surface. In some embodiments, the first inclined surface 111b and the second inclined surface 112b may each include a concave curved surface.

6 is a diagram of a backlight module according to another embodiment of the present invention. Partial section view. As shown in FIG. 6, in the present embodiment, the studs 200a are provided on the frame 100, and the cross-sectional width of the studs 200a is not equal from top to bottom. The stud 200a has an inner side wall 201a and an outer side wall 202a. The inner side wall 201a is closer to the opening 101 than the outer side wall 202a. The optical film 300 is sleeved on the stud 200a and covers the opening 101. At least a portion of the inner sidewall 201a of the stud 200a is inclined relative to the bottom surface 301 of the optical film 300. The light source module 400 is at least partially exposed to the opening 101 and disposed under the optical film 300 and the frame 100.

In the above embodiment, due to the inner side wall 201a of the stud 200a It is inclined with respect to the bottom surface 301 of the optical film 300, so that it can be used to reflect light toward or away from the optical film 300, thereby avoiding the darkness or excessive brightness of the junction of the stud 200a and the optical film 300.

Further, as shown in FIG. 6, in some embodiments, a portion of the inner sidewall 201a of the stud 200a is located between the bottom surface 301 of the optical film 300 and the frame 110, and the inner sidewall 201a of the portion is The bottom surface 301 of the optical film 300 can define an angle α. This angle α is an acute angle. In this way, the inner side wall 201a of the portion can direct the light toward the optical film. The reflection of 300 increases the amount of light emitted at the junction of the stud 200a and the optical film 300 to avoid the brightness at the junction of the stud 200a and the optical film 300 being too low.

In some embodiments, the bottom surface 301 of the optical film 300 has The normal direction N is a direction perpendicular to the bottom surface 301 and extending from the bottom surface 301 toward the opening 101. The cross-sectional area of the stud 200a varies along the normal direction N. In some embodiments, the outer sidewall 202a of the stud 200a is parallel to the normal direction N. In order to make the angle α an acute angle, the cross-sectional area of the stud 200a may gradually increase along the normal direction N. In other words, the stud 200a is gradually widened from top to bottom, so that the angle α can be made to be an acute angle, thereby avoiding the darkness of the junction of the stud 200a and the optical film 300. That is to say, in some embodiments, the cross section of the stud 200a along the normal direction N may be a trapezoid having a narrow upper and a lower width so as to make the angle α an acute angle.

In some embodiments, the optical film 300 has a through hole 303a. The through hole 303a penetrates the bottom surface 301 and the top surface 302. The optical film 300 can be sleeved on the stud 200a by the through hole 303a. In other words, the stud 200a can be inserted into the through hole 303a from the bottom surface 301 and passed out of the through hole 303a from the top surface 302 to lay the optical film 300 thereon. In some embodiments, the through hole 303a may also be an upper narrow and a lower hole to match the shape of the stud 200a, so that the stud 200a can closely abut the hole wall of the through hole 303a.

In some embodiments, as shown in FIG. 6, the protrusion 200a can be The first inclined surface 111 of the frame 110 is disposed on the first inclined surface 111 of the frame 110, so that not only the inner side wall 201a of the protrusion 200a can direct the light from the light source module 400. The optical film 300 reflects the first inclined surface 111 to reflect the light from the light source module 400 toward the optical film 300, thereby further preventing the junction of the pillar 200a and the optical film 300 from being too dark.

In some embodiments, as shown in FIG. 6, the backlight module includes a side-in type light source module 400. However, in other embodiments, the backlight module may also include a direct-type light source module 400a (see the 3)).

In some embodiments, as shown in FIG. 6, the cross-sectional profile of the inner sidewall 201a of the stud 200a includes a straight line, but the invention is not limited thereto. For example, referring to FIG. 7, FIG. 7 is a partial cross-sectional view of the frame 100 according to another embodiment of the present invention. As shown in Fig. 7, the stud 200b has an inner side wall 201b. The inner side wall 201b is connected to the frame body 110, and the cross-sectional profile of the inner side wall 201b includes a concave curve, so that the inner side wall 201b has the effect of a concave curved surface, and the curved surface is used to direct the light toward the optical film 300 (see page 6). Figure) Reflection. In addition, as shown in FIG. 8, FIG. 8 is a partial cross-sectional view of the frame 100 according to another embodiment of the present invention. As shown in Fig. 8, the stud 200c has an inner side wall 201c. The inner side wall 201c is connected to the frame body 110, and the cross-sectional profile of the inner side wall 201c includes a convex curve, so that the inner side wall 201b has the effect of a convex curved surface, and the curved surface is used to reflect the light toward the optical film 300.

FIG. 9 illustrates a backlight module according to another embodiment of the present invention Partial view of the area. As shown in FIG. 9, in the present embodiment, the backlight module includes a stud 200d. The stud 200d is disposed on the frame 110. The stud 200d has opposing inner side walls 201d and outer side walls 202d. A portion of the inner sidewall 201d is located between the bottom surface 301 of the optical film 300 and the frame 110, and The inner side wall 201d of this portion and the bottom surface 301 of the optical film 300 may define an angle β. This angle β is an obtuse angle. In this way, the inner sidewall 201d of the portion can reflect the light toward the optical film 300, thereby reducing the amount of light emitted from the junction of the pillar 200d and the optical film 300, so as to avoid the combination of the pillar 200d and the optical film 300. The brightness is too high.

In some embodiments, the cross-sectional width of the stud 200d varies along the normal direction N. Further, the outer side wall 202d of the stud 200d is parallel to the normal direction N. In order to make the angle β an acute angle, the cross-sectional width of the stud 200d can be gradually decreased along the normal direction N. In other words, the stud 200d is gradually narrowed from top to bottom, so that the angle β is obtuse, so that the junction of the stud 200d and the optical film 300 is prevented from being too bright. That is to say, in some embodiments, the cross section of the stud 200d may have a trapezoidal shape with a width and a width, so as to make the angle β an obtuse angle.

In some embodiments, as shown in FIG. 9, the cross-sectional profile of the inner sidewall 201d of the stud 200d includes a straight line, but the invention is not limited thereto. For example, referring to FIG. 10, FIG. 10 is a partial cross-sectional view of a frame 100 according to another embodiment of the present invention. As shown in Fig. 10, the stud 200e has an inner side wall 201e. The inner side wall 201e is connected to the frame body 110, and the cross-sectional profile of the inner side wall 201e includes a concave curve, so that the inner side wall 201e has the effect of a concave curved surface, and the curved surface is used to deflect the light toward the optical film 300 (see the Figure 9) Reflection. In addition, referring to FIG. 11, FIG. 11 is a partial cross-sectional view of the frame 100 according to another embodiment of the present invention. As shown in Fig. 11, the stud 200f has an inner side wall 201f. The inner side wall 201f is connected to the frame body 110, and the cross-sectional profile of the inner side wall 201f includes The convex curve causes the inner side wall 201f to have the effect of a convex curved surface, and this curved surface is used to reflect light toward the optical film 300.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and modified without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.

100‧‧‧Frame

120‧‧‧ side frame

200‧‧‧Bump

300‧‧‧Optical diaphragm

Claims (12)

A backlight module includes: a frame, a frame body and at least one protrusion, the frame body surrounds an opening, and an upper surface of the frame body has a plurality of inclined surfaces, and the at least one protrusion column is disposed on the frame An optical film having a bottom surface facing a portion of the bottom surface facing the inclined surface The vertical distance increases toward the opening; and a light source module is disposed under the optical film and the frame. The backlight module of claim 1, wherein the inclined surfaces comprise a first inclined surface and a second inclined surface that are adjacent to each other, and the slopes of the two adjacent inclined surfaces are not equal. The backlight module of claim 2, wherein the first inclined surface is away from the opening relative to the second inclined surface, and a slope of the second inclined surface is greater than a slope of the first inclined surface, wherein the at least one protruding column The system is disposed above the first inclined surface. The backlight module of claim 1, wherein the stud has a side wall that connects the inclined surface, and the side wall is not perpendicular to the inclined surface. The backlight module of claim 4, wherein the sidewall of the stud is substantially perpendicular to the bottom surface of the optical film. The backlight module of claim 1, wherein the frame of the frame The light source module includes a light guide plate, the side frame surrounds the light guide plate, and at least one light source is located between the side frame and the light guide plate. The backlight module of claim 1, wherein the light source module comprises: at least one light source under the optical film; and a diffuser plate at least partially located between the light source and the optical film. The backlight module of claim 1, wherein the inclined surfaces are composed of a plane, a convex curved surface or a concave curved surface. A backlight module includes: a frame having a frame body and at least one protrusion, the frame body having at least one inclined surface and surrounding an opening, and the less one of the protrusions is disposed on the at least one inclined of the frame body The surface has an inner side wall and an outer side wall, the inner side wall is closer to the opening than the outer side wall, and the cross-sectional width of the protruding column is unequal from top to bottom; at least one optical film is sleeved on The optical film has a bottom surface, at least a portion of the inner side wall is inclined with respect to the bottom surface, and a light source module disposed under the optical film and the frame. The backlight module of claim 9, wherein the stud is a structure of an upper narrow and a lower width. The backlight module of claim 9, wherein the stud is upper and lower Narrow structure. The backlight module of claim 9, wherein the cross-sectional profile of the inner sidewall is a straight line, a concave curve or a convex curve.