TWI685703B - Light guide plate structure, backlight module and display device - Google Patents

Abstract

A light guide plate structure includes a body and a frame. The body includes a first surface, a second surface, and at least one light incident surface. The first surface is spaced apart from the second surface, and the light incident surface is connected to the first surface and the second surface. The light incident surface is used to receive light, so that the light is incident on the body. The body further includes a through hole extending through the first surface and the second surface. The frame is received in the through hole, and the outer peripheral surface of the frame body includes at least a first outer surface and a second outer surface, wherein the first outer surface is closer to the light incident surface than the second outer surface, and the light reflectance of the first outer surface is smaller than the light reflectance of the second outer surface. The present invention further provides a backlight module and a display device including the above-described light guide plate structure.

Description

Light guide plate structure, backlight module and display device

A light guide plate structure, especially a light guide plate with a frame. The invention also relates to a backlight module and a display device having the light guide plate structure.

With the advancement of technology, the development of smart mobile devices continues to progress, for example, smart phones have evolved from small screens to large screens. Coupled with the combination of camera functions, photography, selfies, and live broadcast activities are prosperous, so the lens device is very important.

For the industry, how to maintain the appearance and high screen ratio of smart mobile devices is an important issue. In order to meet the above requirements, when configuring a lens in a smart mobile device, it is necessary to dig holes in the internal display area for the lens configuration .

However, since the backlight module mainly uses the light guide plate for light guide, when light is transmitted in the light guide plate, a bright area is generated on the side of the lens frame facing the light source, and the side of the lens frame facing away from the light source is generated. The dark area will cause uneven brightness around the digging hole, resulting in the problem of different brightness of the overall picture.

An embodiment of the present invention provides a light guide plate structure including a body and a frame.

The body includes a first surface, a second surface, and at least one light incident surface. The first surface and the second surface are spaced apart. The light incident surface connects the first surface and the second surface, and the light incident surface is used to receive light incident into the body; The main body further includes a through hole penetrating the first surface and the second surface.

The frame body is received in the through hole, the outer edge surface of the frame body includes at least a first surface and a second surface, wherein the first surface faces the light incident surface, and the light reflectance of the first surface is smaller than that of the second surface rate.

According to the light guide plate structure described above, in one embodiment, the frame further includes a first block and a second block, the first block and the second block are combined to form a frame; wherein the outer edge of the first block The surface is the first surface, and the outer edge surface of the second block is the second surface.

As described above, in an embodiment of the light guide plate structure, the first block and the second block are made of different materials.

In one embodiment, the light guide plate structure described above further includes a first block, which is combined with the outer edge of the frame to form a first surface.

In one embodiment, the light guide plate structure as described above further includes a second block, which is combined with the outer edge of the frame to form a second surface.

In one embodiment, the light guide plate structure described above further includes a first coating layer, which is coated on the first surface.

In one embodiment, the light guide plate structure described above further includes a second coating layer, which is coated on the second surface.

In one embodiment, the light guide plate structure described above further includes a first coating layer and a second coating layer, which are coated on the first surface and the second surface.

The invention also provides a light guide plate structure according to an embodiment, which includes a body and a frame.

The body includes a first surface, a second surface, and at least one light incident surface. The first surface and the second surface are spaced apart. The light incident surface connects the first surface and the second surface, and the light incident surface is used to receive light incident into the body; The main body further includes a through hole penetrating the first surface and the second surface.

The frame body is received in the through hole, the outer edge surface of the frame body defines a first longitudinal centerline and an opposite second longitudinal centerline, the first longitudinal centerline is close to the light incident surface, and the second longitudinal centerline is away from the light incident surface The light reflectance of the outer edge surface of the frame extends from the first longitudinal centerline to the second longitudinal centerline and gradually increases.

The present invention also provides a backlight module according to an embodiment, which includes the light guide plate structure, the light source, at least one optical film, and a reflective film as described above.

The light source is arranged toward the light incident surface, and is used to project light onto the light incident surface; the optical film is arranged on the first surface of the body to adjust the light output of the first surface, and the optical film includes a through hole corresponding to the through hole, and the frame body extends It is accommodated in the through hole; the reflective film is arranged under the second surface, and contains the opening corresponding to the through hole, and the frame body is extended and accommodated in the opening.

The present invention also provides an embodiment of a display device, including a housing, the above-mentioned backlight module and a liquid crystal panel.

The casing has an accommodating space and a window communicating with the accommodating space; the backlight module is arranged in the accommodating space, and the first face is facing the window; the liquid crystal panel is arranged in the accommodating space and covers the window.

In one embodiment, the display device described above further includes a lens, the frame body further includes a hole, and the lens is disposed in the hole.

Through one or more of the above embodiments, because the frame has surfaces with different light reflectances, when light is input into the body of the light guide plate structure, the surface of the frame can adjust the brightness of the light, reducing the brightness of the area near the first surface of the body And increase the brightness of the area close to the second surface of the body, effectively improving the light uniformity of the overall picture.

Please refer to FIGS. 1 and 2, which are a partial schematic view of an embodiment of a light guide plate structure 1 of the present invention and a cross-sectional schematic view of an embodiment of a backlight module of the present invention, respectively. The light guide plate structure 1 includes a body 11 and a frame 12. The body 11 includes a first surface 111, a second surface 112, and at least one light incident surface 113 (see FIG. 2). The first surface 111 and the second surface 112 are spaced apart. The light incident surface 113 connects the first surface 111 and the second surface respectively. The two surfaces 112 and the light incident surface 113 are used to receive the light L and enter the body 11. The main function of the light guide plate structure 1 is to guide the projection direction of the light L, so as to improve the brightness of the applied backlight module and control the brightness uniformity. In some embodiments, the material of the light guide plate is, for example, PMMA (Acrylic Resin), but it is not limited thereto.

The body 11 further includes a through hole 114 penetrating the first surface 111 and the second surface 112. The frame body 12 can be received in the through hole 114. The outer edge surface of the frame body 12 includes at least a first surface 12a and a second surface 12b, wherein the first surface 12a is closer to the light incident surface 113 than the second surface 12b, that is, The first surface 12a faces the light incident surface 113, and the second surface 12b is located far away from the light incident surface 113, and the light reflectance of the first surface 12a is smaller than that of the second surface 12b. That is to say, the frame body 12 has surfaces with different light reflectances (such as the first surface 12a and the second surface 12b), wherein the surface with the smaller light reflectivity faces the light incident surface 113, so that when the light L is thrown into the body 11 and when guided to the frame 12, the brightness of the light around the frame 12 can be adjusted to reduce the brightness of the area of the body 11 close to the first surface 12a, and to increase the brightness of the area of the body 11 close to the second surface 12b, effectively The light L is projected uniformly in the body 11.

In addition, the frame 12 may be round, square, rectangular, or other geometric shapes, and the invention is not limited. Frames having a first surface 12a facing the light incident surface 113 with low light reflection characteristics and a second surface 12b facing away from the light incident surface 113 with high light reflection characteristics are within the scope of the present invention.

Please refer to FIG. 3, which is an external schematic view of an embodiment of the frame 12 in the light guide plate structure 1 of the present invention. In this embodiment, the frame 12 further includes a first block 121 and a second block 122. The first block 121 and the second block 122 are combined to form the frame 12. The outer surface of the first block 121 It is the first surface 12a, and the outer edge surface of the second block 122 is the second surface 12b. In other words, the frame 12 may be composed of two or more blocks, and the outer edges of the blocks have differences in light reflectance.

In some embodiments, the first block 121 and the second block 122 can be made of different materials, so that the difference in light reflectance between the first surface 12a and the second surface 12b can be achieved.

Please refer to FIG. 4A, which is a schematic view of an embodiment of the frame 12 in the light guide plate structure 1 of the present invention. In this embodiment, the light guide plate structure 1 further includes a first block 127, which is combined with the outer edge of the frame 12 to form a first surface 12a. The materials of the first block 127 and the frame 12 may be the same or different. The purpose is that the first surface 12a formed by the first block 127 and the second surface 12b of the frame 12 have different light reflectivities to improve The problem that the light L is projected on the area of the body 11 facing the first surface 12a and the area facing the second surface 12b differ in brightness.

Please refer to FIG. 4B, which is a schematic view of an embodiment of the frame 12 in the light guide plate structure 1 of the present invention. The difference from the embodiment shown in FIG. 4A is that the light guide plate structure 1 further includes a second block 128, which is combined with the outer edge of the frame 12 to form a second surface 12b. The materials of the second block 128 and the first block 127 may be the same or different. The purpose is to cause the light reflectance of the first surface 12a and the second surface 12b to be different, so as to improve the above-mentioned problems.

In the above, whether the light guide plate structure 1 includes the first block 127 or the second block 128, in one embodiment, it is completed by over-molding.

In some embodiments, the first block 127 and the second block 128 are combined to form the frame body 12, and the combining means, for example, fixes the first block 127 and the second block 128 to form the frame body 12 by adhesion The structure of the frame 12 is similar to the embodiment shown in FIG. 3.

Please refer to FIG. 4C, which is a schematic view of an embodiment of the frame 12 in the light guide plate structure 1 of the present invention. In this embodiment, the light guide plate structure 1 further includes a first coating layer 123, which is coated on the first surface 12a. The first coating layer 123 is, for example, a glue layer. Through the selection of the type of glue coating, the light reflectance of the first surface 12a is changed so as to be different from the light reflectance of the second surface 12b.

In contrast, in other embodiments, the first coating layer 123 is absent on the first surface 12a. However, the light guide plate structure 1 includes a second coating layer 124 coated on the second surface 12b. The second coating layer 124 is, for example, an adhesive lacquer layer, which is different from the light reflectance of the first surface 12a. In this way, the light reflectance of the first surface 12a is smaller than that of the second surface 12b.

Please refer to FIG. 4D, which is a schematic view of an embodiment of the frame 12 in the light guide plate structure 1 of the present invention. In this embodiment, the light guide plate structure 1 includes a first coating layer 123 and a second coating layer 124, which are coated on the first surface 12a and the second surface 12b, respectively.

In other words, the present invention does not limit the coating layer coated on the first surface 12a or the second surface 12b. The difference between the light reflectance of the first surface 12a and the light reflectance of the second surface 12b is the protection of the present invention. Scope.

Please refer to FIG. 5, which is an external view of an embodiment of the frame 12 in the light guide plate structure 1 of the present invention. Different from the above embodiment, in the embodiment shown in FIG. 4, the outer edge surface of the frame body 12 defines a first longitudinal centerline 125 and an opposite second longitudinal centerline 126. The first longitudinal centerline 125 is close to The light surface 113, and the second longitudinal centerline 126 is away from the light incident surface 113. The light reflectance of the outer edge surface of the frame 12 gradually increases from the first longitudinal centerline 125 to the second longitudinal centerline 126.

That is to say, the light reflectance of the outer edge surface of the frame 12 increases gradually, extending from the first longitudinal centerline 125 to the second longitudinal centerline 126. In this way, since the first longitudinal centerline 125 is close to the light incident surface 113, the amount of light L is large, but the light reflectance of the area is small, and the amount of light L can be adjusted to reduce the brightness; in contrast, the second longitudinal centerline 126 Far away from the light incident surface 113, the light reflectance in this area is large, which can improve the brightness, so that the overall brightness of the light guide sheet structure is uniform.

Please refer to FIG. 2 again. The backlight module 2 can be applied to any of the light guide plate structures 1 shown above. The backlight module 2 further includes a light source 21, at least one optical film 22 and a reflective film 23.

The light source 21 is disposed toward the light incident surface 113 and is used to project the light L to the light incident surface 113. The optical film 22 includes, for example, an upper diffusion film 221, a light enhancement film 222, and a lower diffusion film 223, which are disposed on the first surface 111 of the body 11 to adjust the light output of the first surface 111, and the optical film 22 includes a corresponding through hole 114 The through hole 224 is extended and received in the through hole 224. The reflective film 23 is disposed under the second surface 112 and includes an opening 231 corresponding to the through hole 114. The frame body 12 extends and is received in the opening 231.

Because the backlight module 2 uses the light guide plate structure 1 of any of the above embodiments, when the light source 21 is lit, the backlight module 2 may exhibit a uniform brightness.

Please refer to FIG. 6, which is an exploded view of an embodiment of the display device 3 of the present invention. The display device 3 includes a housing 31, the above-mentioned backlight module 2 and a liquid crystal panel 32. The display device 3 is, for example, a flat screen.

The housing 31 has an accommodating space 311 and a window 312 communicating with the accommodating space 311. The backlight module 2 is disposed in the accommodating space 311, and the first surface 111 faces the window 312. The liquid crystal panel 32 is disposed in the accommodating space 311 and covers the window 312. The liquid crystal panel 32 includes an opening 321 corresponding to the frame 12. The frame 12 penetrates the through hole 224 and is received in the opening 321.

The display device 3 has the light guide plate structure 1 inside. Therefore, the light reflectances of the first surface 12a and the second surface 12b of the frame 12 are different. The brightness of the receiving area of the frame 12 and the body 11 can be adjusted to make the display device 3 The picture shows the phenomenon of uniform brightness.

In this embodiment, the display device 3 further includes a lens 322, the frame 12 further includes a hole 129, and the lens 322 is disposed in the hole 129 of the frame 12 and fixed to the through hole 114.

Through the light guide plate structure provided by one or more embodiments of the present invention, because the frame has surfaces with different light reflectances, when light is thrown into the body of the light guide plate structure, the surface of the frame can adjust the brightness of the light to make the body pass through The brightness of the area close to the light source of the hole is reduced, and the brightness of the area away from the light source is increased, effectively improving the overall brightness of the picture.

In addition, the backlight module and the display device having the light guide plate structure in the above one or more embodiments also have the effect of light guide symmetry.

1‧‧‧Light guide plate structure

11‧‧‧Body

111‧‧‧ First side

112‧‧‧Second side

113‧‧‧entrance

114‧‧‧Through hole

12‧‧‧frame

12a‧‧‧First surface

12b‧‧‧Second surface

121‧‧‧The first block

122‧‧‧The second block

123‧‧‧First coating layer

124‧‧‧Second coating layer

125‧‧‧First longitudinal centerline

126‧‧‧Second longitudinal centerline

127‧‧‧ Block 1

128‧‧‧ Block 2

129‧‧‧hole

2‧‧‧Backlight module

21‧‧‧Light source

22‧‧‧Optical diaphragm

221‧‧‧Upper diffuser

222‧‧‧Enhanced film

223‧‧‧Lower diffuser

224‧‧‧Through hole

23‧‧‧Reflective diaphragm

231‧‧‧opening

3‧‧‧Display device

31‧‧‧Housing

311‧‧‧accommodation space

312‧‧‧window

32‧‧‧LCD panel

321‧‧‧hole

322‧‧‧Lens

L‧‧‧Light

[FIG. 1] It is a partial schematic view of the appearance of one embodiment of the light guide plate structure of the present invention. [FIG. 2] It is a schematic cross-sectional view of an embodiment of the backlight module of the present invention. [FIG. 3] This is a schematic view of the appearance of one embodiment of the frame in the light guide plate structure of the present invention. [FIG. 4A] This is a schematic view of an embodiment of a frame in the light guide plate structure of the present invention. [FIG. 4B] This is a schematic view of an embodiment of the frame in the light guide plate structure of the present invention. [FIG. 4C] This is a schematic view of the appearance of one embodiment of the frame in the light guide plate structure of the present invention. [Fig. 4D] This is a schematic view of an embodiment of a frame in the light guide plate structure of the present invention. [FIG. 5] This is a schematic view of the appearance of one embodiment of the frame in the light guide plate structure of the present invention. [FIG. 6] It is an exploded schematic view of one embodiment of the display device of the present invention.

1‧‧‧Light guide plate structure

11‧‧‧Body

111‧‧‧ First side

112‧‧‧Second side

114‧‧‧Through hole

12‧‧‧frame

12a‧‧‧First surface

12b‧‧‧Second surface

129‧‧‧hole

L‧‧‧Light

Claims (4)

A light guide plate structure includes: a body including a first surface, a second surface, and at least one light incident surface, the first surface and the second surface are spaced apart, and the light incident surface connects the first surface and the second surface The second surface, and the light incident surface is used to receive a light incident into the body; the body further includes a through hole, penetrating the first surface and the second surface; and a frame body, received in the through hole, The outer edge surface of the frame defines a first longitudinal centerline and an opposite second longitudinal centerline, the first longitudinal centerline is close to the light incident surface, and the second longitudinal centerline is away from the light incident surface; wherein The light reflectance of the outer edge surface of the frame body gradually increases from the first longitudinal centerline to the second longitudinal centerline. A backlight module, comprising: the light guide plate structure as described in claim 1; a light source, which is disposed toward the light incident surface and used to project the light on the light incident surface; at least one optical film is disposed on the body The first surface is used to adjust the light output of the first surface, and the at least one optical film includes a through hole corresponding to the through hole, the frame body is extended to be received in the through hole; and a reflective film is provided at Under the second surface, there is an opening corresponding to the through hole, and the frame body is extended and received in the opening. A display device includes: a housing having an accommodating space and a window communicating with the accommodating space; the backlight module according to claim 2 is provided in the accommodating space, and the first surface is facing The window; and A liquid crystal panel is disposed in the accommodating space and covers the window. The liquid crystal panel includes a hole corresponding to the frame body. The frame body penetrates the through hole and is received in the hole. The display device according to claim 3, further includes a lens, the frame body further includes a hole, and the lens is disposed in the hole.

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