TWM562983U - Light guide plate, backlight module and display device - Google Patents

Abstract

A light guide plate, a backlight module and a display device, wherein the backlight module and the display device comprise the light guide plate, the light guide plate is mainly formed on a reflective surface of the light guide plate body to form a plurality of light guiding microstructures, the guide The light microstructure comprises a circular plane and a slanted circumferential surface, the circular plane is parallel to the reflecting surface and forms a height difference with respect to the reflecting surface, and the inclined peripheral surface extends from the outer periphery of the circular plane to engage the reflecting surface, thereby guiding the light The flat circular plane of the structure and the inclined circumferential surface of the periphery converge the light to reduce scattered light to improve the light output of the light source after passing through the light guide plate.

Description

Light guide plate, backlight module and display device

The present invention relates to a light guiding component and an application thereof, and more particularly to a light guiding plate, a backlight module and a display device.

For a display panel of a display device such as a liquid crystal display, a backlight module is usually required to provide its necessary backlight. The backlight module of the present invention is characterized in that a light source is disposed outside the light incident surface of a light guide plate, and one or more optical films are disposed outside the light exit surface of the light guide plate, so that the light emitted by the light source passes through the light guide plate. The lens is evenly dispersed, and then the light emitted from the light-emitting surface of the light guide plate is further diffused and dispersed by the optical film to provide a uniform brightness backlight to the display panel.

In the above-mentioned light guide plate structure, it mainly has a rectangular plate-shaped light guide plate body, and is emitted in a forward direction which is biased toward 90 degrees toward the dispersion and reflection of incident light, and the light guide plate is reflected on the light guide plate body. A plurality of light guiding microstructures are formed, so that the light incident on the light guide plate is reflected by the light guiding microstructure to face the light emitting surface direction.

In the structure of the existing light guide plate, as shown in FIG. 15, the bottom surface of the light guiding microstructure 42 formed by the reflecting surface 41 of the light guiding plate 40 forms a curved surface of a full arc, which is incident through the light incident surface 43 of the light guiding plate 40. When the light passes through the light guiding microstructure 42 , the light is directly emitted from the curved surface of the light guiding microstructure 42 facing away from the light incident surface 43 , and cannot be reflected toward the light emitting surface 44 , so that the light source passes through the light guiding plate 40 and generates more light. The stray light is reduced by the effective light of the light exit surface 44 of the light guide plate 40, thereby reducing the luminance of the light emitted.

The purpose of the present invention is to provide a light guide plate, a backlight module and a display device, which solve the problem that the existing light guide plate is likely to generate more stray light and reduce the brightness.

In order to achieve the foregoing, the light guide plate provided by the present invention comprises: a light guide plate body, comprising a light emitting surface, a reflecting surface and a light incident side, wherein the light emitting surface and the reflecting surface are respectively located opposite to the light guiding plate body. On both sides, the light incident side is located at one side of the light guide body; and a plurality of light guiding microstructures are formed on the reflective surface of the light guide body, the light guiding microstructure comprises a circular plane and a tilting circumference The plane of the circle is parallel to the reflecting surface and forms a height difference with respect to the reflecting surface, and the inclined peripheral surface extends from the outer periphery of the circular plane to engage the reflecting surface.

In the light guide plate as described above, the light guiding microstructure is formed to protrude from the reflecting surface, and the light guiding microstructure comprises a center line, the center line is perpendicular to the reflecting surface, and the light guiding micro The circular plane of the structure is located outside the reflecting surface.

In the light guide plate as described above, the light guiding microstructure is formed to protrude from the reflecting surface and define a bottom plane on the reflecting surface, and the circular plane of the light guiding microstructure is located outside the reflecting surface The light guiding microstructure includes a center line extending obliquely from a center of the circular plane toward a light-incident side to a center of the bottom plane, and the center line passes through the circle One of the normals of the center of the plane has an included angle, which is an acute angle.

In the light guide plate as described above, the light guiding microstructure is formed to protrude from the reflecting surface, the circular plane of the light guiding microstructure is located outside the reflecting surface, and the light guiding microstructure comprises a center line And the inclined peripheral surface of the light guiding microstructure comprises a first element line facing the light incident side and a second element line facing away from the light incident side, the first element line and the second element The wire systems are respectively located on opposite sides of the center line along the light incident direction, and an outer angle of the first prime line with respect to the reflective surface forms an angle with an outer angle of the second plain line with respect to the reflective surface, so that The light guiding microstructure is asymmetrical.

In the light guide plate as described above, the light guiding microstructure is recessed from the reflective surface, and the light guiding microstructure comprises a center line, the center line is perpendicular to the reflecting surface, and the light guiding microstructure The circular plane is located inside the reflecting surface.

In the light guide plate as described above, the light guiding microstructure is recessed inward from the reflecting surface and defines an opening on the reflecting surface, and a circular plane of the light guiding microstructure is located inside the reflecting surface. The light guiding microstructure includes a center line extending obliquely from a center of the circular plane toward a back side of the light entrance to a center of the opening, and the center line passes through the plane of the circle One of the centers of the normal has an angle, and the angle is an acute angle.

In the light guide plate as described above, the light guiding microstructure is recessed inward from the reflecting surface, the circular plane of the light guiding microstructure is located inside the reflecting surface, and the light guiding microstructure comprises a center line And the inclined peripheral surface of the light guiding microstructure comprises a first element line facing the light incident side and a second element line facing away from the light incident side, the first element line and the second element The wire systems are respectively located on opposite sides of the center line along the light incident direction, and an inner angle of the first prime line with respect to the reflective surface forms an angle with an inner angle of the second prime line with respect to the reflective surface. The light guiding microstructure is made asymmetric.

In the light guide plate as described above, the light-emitting surface of the light guide plate is formed with a plurality of light-emitting microstructures.

In order to achieve the foregoing, the backlight module provided by the present invention comprises: a light guide plate as described above; at least one optical film disposed outside the light exit surface of the light guide plate; and a light source disposed on the light guide plate An outer side of the light incident side of the light guide plate, and a light exiting direction of the light source faces the light incident side.

In order to achieve the foregoing, the display device provided by the present invention comprises: a backlight module as described above; and a display panel mounted on an outer side of the optical film of the backlight module.

With the creation of this new type, it mainly has the following advantages:

1. Converging light and improving brightness: The light guide plate of the present invention mainly uses a plurality of light guiding microstructures formed on the reflecting surface, each of which has a circular plane and extends from the circumference of the circular plane to the reflection. The structure of the inclined circumferential surface of the surface enables the light to be reflected from the light incident side of the light guide plate, and the light will be reflected when the light contacts the circular plane, and part of the reflected light is directly turned to the direction of the light exiting surface, and part of the reflected light is contacted. The inclined peripheral surface around the circular plane is redirected to the direction toward the light exiting surface to converge the light, so that the full width at half maximum (FWHM) can be further reduced. Thus, the light guide plate can be further reduced. The plurality of special light guiding microstructures converge light and reduce stray light, so that the effective light emitted through the light emitting surface of the light guide plate can be increased, and the light emission brightness can be improved.

2. The light guide plate is easily released from the mold. As described above, the light guide plate is formed on the light guide plate by using a plurality of light guide microstructures formed on the reflective surface, and each light guide microstructure comprises a circular system. The plane and the structure extending from the periphery of the circular plane to the inclined peripheral surface of the reflecting surface, thereby configuring the new structure of the curved surface of the light guide microstructure of the existing light guide plate The light guide plate has the advantage of easy release molding.

1‧‧‧Backlight module

2‧‧‧ display panel

10A, 10B, 10C, 10D, 10E, 10F‧‧‧ light guide plates

11A, 11B, 11C, 11D, 11E, 11F‧‧‧ light guide body

111A, 111B, 111C, 111D, 111E, 111F‧‧‧ light surface

112A, 112B, 112C, 112D, 112E, 112F‧‧‧ reflective surface

113A, 113B, 113C, 113D, 113E, 113F‧‧‧

12A, 12B, 12C, 12D, 12E, 12F‧‧‧ light guiding microstructure

120A, 120B, 120C, 120D, 120E, 120F‧‧‧ center line

121A, 121B, 121C, 121D, 121E, 121F‧‧‧ round plane

122A, 122B, 122C, 122D, 122E, 122F‧‧‧ sloping circumferential surface

124C, 124F‧‧‧ first prime line

125C, 125F‧‧‧ second prime line

126E‧‧‧ openings

H‧‧‧ height difference between the circular plane and the reflecting surface

L1, L2‧‧‧ normal

The angle between the center line of θ 1 and θ 2‧‧‧ and one of the normals passing through the center of the plane of the circle

α 1‧‧‧ The outer angle of the first prime line relative to the reflective surface

The outer angle of the α 2‧‧‧ second element line relative to the reflecting surface

β 1‧‧‧The inner angle of the first prime line relative to the reflecting surface

The inner angle of the β 2‧‧‧ second element line relative to the reflecting surface

20‧‧‧Optical diaphragm

30‧‧‧Light source

40‧‧‧Light guide plate

41‧‧‧reflecting surface

42‧‧‧Light guiding microstructure

43‧‧‧Into the glossy surface

44‧‧‧Glossy

1 is a plan view showing a first preferred embodiment of the novel light guide plate.

2 is a bottom perspective view of the light guiding microstructure of the first preferred embodiment of the light guide plate shown in FIG. 1.

3 is a plan view showing a second preferred embodiment of the novel light guide plate.

4 is a bottom perspective view of the light guiding microstructure of the second preferred embodiment of the light guide plate of FIG. 2.

Figure 5 is a plan view showing a third preferred embodiment of the novel light guide plate.

Figure 6 is a plan view showing a fourth preferred embodiment of the novel light guide plate.

Figure 7 is a plan view showing a fifth preferred embodiment of the novel light guide plate.

Figure 8 is a plan view showing a sixth preferred embodiment of the novel light guide plate.

FIG. 9 is a schematic plan view showing a preferred embodiment of the backlight module of the present invention.

Figure 10 is a schematic illustration of incident light reflected by a first preferred embodiment of the novel light guide.

Figure 11 is a schematic illustration of incident light reflected by a third preferred embodiment of the novel light guide.

Figure 12 is a schematic illustration of incident light reflected by a fourth preferred embodiment of the novel light guide.

Figure 13 is a schematic illustration of incident light reflected by a sixth preferred embodiment of the novel light guide.

Figure 14 is a plan view showing a preferred embodiment of the display device of the present invention.

Figure 15 is a schematic illustration of incident light reflected by a conventional light guide.

The present invention comprises a light guide plate, a backlight module and a display device. As shown in FIG. 1 , FIG. 3 and FIG. 5 to FIG. 8 , several preferred embodiments of the novel light guide plate are disclosed, which can be seen from the figure. The light guide plates 10A to 10F include a light guide plate body 11A to 11F and a plurality of light guide microstructures 12A to 12F.

As shown in FIG. 1 , FIG. 3 , and FIG. 5 to FIG. 8 , the light guide plate body 11 includes a light-emitting surface 111A-111F, a reflective surface 112A-112F, and a light-incident side surface 113A-113F. The light-emitting surfaces 111A-111F and the reflection surfaces 112A-112F are respectively located on opposite sides of the light guide plate bodies 11A to 11F, and the light-incident side surfaces 113A to 113F are located on one side of the light guide plate bodies 11A to 11F. The light guide plate 10A~ The light-emitting surfaces 111A-111F of the 10F may also form a plurality of light-emitting microstructures (not shown), such as strip-shaped microstructures perpendicular to the light-incident side surfaces 113A-113F.

As shown in FIG. 1 , FIG. 3 and FIG. 5 to FIG. 8 , a plurality of the light guiding microstructures 12A to 12F are formed on the reflecting surfaces 112A to 112F of the light guiding plate bodies 11A to 11F. The plurality of light guiding microstructures 12A to 12F are substantially perpendicular to the direction of the light incident side surfaces 113A to 113F, and The optical trends of the light guide plates 10A to 10F are adjusted by the plurality of light guiding microstructures 12A to 12F provided on the reflecting surfaces 112A to 112F. The light guiding microstructures 12A to 12C form protrusions protruding from the reflecting surfaces 112A to 112C, or the light guiding microstructures 12D to 12F form recesses recessed into the reflecting surfaces 112D to 112F, and the plurality of The shape, size, and distribution of the light guiding microstructures 12A to 112F are set on the reflecting surfaces 112A to 112F, etc., depending on the distance from the light incident side surfaces 113A to 113F, or depending on the optical characteristics of different products. Close arrangement, etc.

In each of the preferred embodiments, the light guiding microstructures 12A-12F include a circular plane 121A-121F and an inclined circumferential surface 122A-122F, as shown in FIG. 2 and FIG. The circular planes 121A to 121F are circular or elliptical planes, and the circular planes 121A to 121F are parallel to the reflecting surfaces 112A to 112F and form a height difference h with respect to the reflecting surfaces 112A to 112F. In a preferred embodiment of the present invention, the height difference h of the circular planes 121A-121F with respect to the reflecting surfaces 112A-112F is about 1 μm to 3 μm, and the inclined circumferential surfaces 122A-122F are from the circular system. The outer surfaces of the planes 121A-121F extend to engage the reflective surfaces 112A-112F. In the preferred embodiment, the internal angle between the inclined circumferential surfaces 122A-122F and the circular planes 121A-121F is about 130 degrees to 150 degrees.

As shown in the first preferred embodiment of FIG. 1 and FIG. 2, the light guiding microstructure 12A is formed to protrude from the reflecting surface 112A, and the light guiding microstructure 12A is a positive truncated conical convex body. The light guiding microstructure 12A includes a center line 120A perpendicular to the reflecting surface 112A, and the circular plane 121A of the light guiding microstructure 12A is located outside the reflecting surface 112A.

As shown in the second preferred embodiment of FIG. 3 and FIG. 4, the light guiding microstructure 12B is formed to protrude from the reflecting surface 112B and defines a bottom plane on the reflecting surface 112B. The circular plane 121B of the structure 12B is located outside the reflective surface 112B, the light guiding microstructure 12B is a truncated conical convex body, and the light guiding microstructure 12B includes a center line 120B, which is from the center line 120B. The center of the circular plane 121B extends obliquely toward the light incident side surface 113B to the middle of the bottom plane The center line 120B has an angle θ 1 with one of the normal lines L1 passing through the center of the circular plane 121B, and the angle θ 1 is an acute angle.

As shown in FIG. 5, the light guiding microstructure 12C is formed to protrude from the reflecting surface 112C, and the circular plane 121C of the light guiding microstructure 12C is located outside the reflecting surface 112C. The light guiding microstructure 12C is an oblique convex body, the light guiding microstructure 12C includes a center line 120C, and the inclined circumferential surface 122C of the light guiding microstructure 12C includes a first surface facing the light incident side surface 113C. The first line 124C and the second line 125C are respectively located on opposite sides of the center line 120C along the light incident direction, and the first line 124C and the second line 125C are respectively located on the opposite side of the light incident side 113C. And the outer angle of the first prime line 124C with respect to the reflective surface 112C and the outer angle of the second prime line 125C with respect to the reflective surface 112C are not equal, so that the light guiding microstructure 12C forms an asymmetry.

In the fourth preferred embodiment, as shown in FIG. 6, the light guiding microstructure 12D is recessed inward from the reflecting surface 112D, and the light guiding microstructure 12D can be a positive truncated conical recess, which includes a The center line 120D is perpendicular to the reflecting surface 112D, and the circular plane 121D of the light guiding microstructure 12D is located inside the reflecting surface 112D.

As shown in the fifth preferred embodiment of FIG. 7, the light guiding microstructure 12E is recessed inwardly from the reflecting surface 112E and defines an opening 126E on the reflecting surface 112E. The light guiding microstructure 12E The circular plane 121E is located inside the reflective surface 112E, and the light guiding microstructure 12E can be an oblique truncated conical pocket including a centerline 120E from the circular plane 121E. The center extends obliquely to the center of the opening 126E toward the light incident side surface 113E, and the center line 120E has an angle θ 2 with a normal line L2 passing through the center of the circular plane 121E, the angle θ 2 It is an acute angle.

As shown in FIG. 8, the light guiding microstructure 12F is recessed inwardly from the reflecting surface 112F, and the circular plane 121F of the light guiding microstructure 12F is located inside the reflecting surface 112F. The light guiding microstructure 12F is an oblique recess, and the light guiding microstructure 12 includes a center line 120. The inclined peripheral surface 122F of the light guiding microstructure 12F includes a first plain line 124F facing the light incident side surface 113F and a second prime line 125F facing away from the light incident side surface 113F. The first plain line 124F And the second prime line 125F is located on opposite sides of the center line 120F along the light incident direction, and the inner angle β 1 of the first prime line 124F relative to the reflective surface 112F and the second prime line The 125F forms an angle with respect to the internal angle β 2 of the reflecting surface 112F, making the light guiding microstructure 12F asymmetrical.

As shown in FIG. 9, the backlight module 1 of the present invention comprises a light guide plate 10A, at least one optical film 20, and a light source 30. The shape of the light guide plate 10A is as described above. The structure of the light guide plates 10A to 10F is exemplified, and will not be described herein. The optical film 20 is disposed outside the light-emitting surface 111A of the light guide plate 10A. When the number of the optical films 20 is plural, the plurality of optical films 20 are sequentially arranged on the outer side of the light-emitting surface 111A of the light guide plate 10A. The light source 30 is disposed outside the light incident side surface 113A of the light guide plate 10A, and the light emitting direction of the light source 30 faces the light incident side surface 113A, so that the light emitted by the light source 30 can pass through the light incident side surface 113A of the light guide plate 10A. The light is uniformly diffused and steered by the light guide plate 10A, and is uniformly scattered by the light exiting surface 111A of the light guide plate 10A.

In the various preferred embodiments of the light guide plates 10A-10F, when the light guiding microstructures 12A, 12D are positive truncated conical convex bodies or positive truncated conical concave holes, the light emitted by the light source passes through the light guide plate 10A, The light incident sides 113A and 113D of the 10D are incident. As shown in FIG. 10 and FIG. 12, during the traveling of the incident light rays in the light guide plates 10A and 10D, the light will contact the circular planes 121A and 121D to generate reflection, and some of them are reflected. The reflected light directly turns to the direction toward the light-emitting surfaces 111A, 111D, and the partially reflected light contacts the inclined peripheral surfaces 122A, 122D around the circular planes 121A, 121D, and then reflects to the direction of the light-emitting surfaces 111A, 111D to make the light Convergence, the full width at half maximum (FWHM) can be further reduced. Thus, the light guide plates 10A, 10D can converge light and reduce stray light by using a plurality of special light guiding microstructures 12A, 12D. So can The effective light emitted through the light-emitting surfaces 111A and 111D of the light guide plates 10A and 10D is increased to increase the light-emitting luminance.

When the light guiding microstructures 12B, 12C, 12E, and 12F of the light guiding plates 10B, 10C, 10E, and 10F are oblique convex bodies or oblique concave holes, the light guiding plates 10C and 10F shown in FIG. 5 and FIG. 8 are used. For example, during the traveling of the incident light in the light guide plates 10C, 10F, as shown in FIG. 11 and FIG. 13, the light will contact the circular planes 121C and 121F to generate reflection, and part of the reflected light is directly turned to the light emitting surface. In the direction of 111C and 111F, the other part of the reflected light will contact the inclined peripheral surfaces 122C and 122F around the circular planes 121C and 121F, and then the reflection will be turned to the direction of the light-emitting surfaces 111C and 111F to converge the light. The traveling path is advanced from the first prime lines 124C, 124F near the light incident sides 113C, 113F to the second prime lines 125C, 125F away from the light incident sides 113C, 113F, and thus, in the process of the light traveling forward The probability of hitting the 125C and 125F portions of the second prime line is greater than the probability that the light hits the first plain lines 124C and 124F, and in order to increase the light reflection to the light exiting surfaces 111C and 111F, FIG. 11 and FIG. 13 The illustrated embodiments The second element lines 125C and 125F are designed to have a larger area and a larger angle than the first element lines 124C and 124F, so that the light guide plates 10C and 10F can be made of a plurality of special and asymmetrical The light guiding microstructures 12C and 12F converge light and reduce stray light, so that the full width at half maximum (FWHM) can be further reduced, and the effective light emitted through the light emitting surfaces 111C and 111F of the light guiding plates 10C and 10F is increased to improve the light emission.

As shown in FIG. 14, the display device proposed by the present invention comprises a backlight module 1 and a display panel 2. The constituent structure of the backlight module 1 is as described above, and details are not described herein again. The display panel 2 is mounted on the outside of the optical film 20 of the backlight module 1 , and the backlight module 1 provides the necessary backlight to the display panel 2 .

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Although the present invention has been disclosed above in the preferred embodiments, it is not intended to limit the present invention. Technical personnel, without departing from the scope of this new technical content, when The equivalents of the above-described preferred embodiments may be made in accordance with the technical content of the present invention without departing from the spirit and scope of the present invention. , equivalent changes and modifications are still within the scope of this new technical content.

Claims (10)

A light guide plate comprising: a light guide plate body, comprising: a light emitting surface, a reflecting surface and a light incident side, wherein the light emitting surface and the reflecting surface are respectively located on opposite sides of the light guiding plate body, wherein the light incident side is located at the light guiding surface a light guiding plate body; and a plurality of light guiding microstructures formed on the reflecting surface of the light guiding plate body, the light guiding microstructure comprises a circular plane and an inclined circumferential surface, the circular plane is parallel to The reflecting surface forms a height difference with respect to the reflecting surface, and the inclined peripheral surface extends from the outer periphery of the circular plane to engage the reflecting surface. The light guide plate of claim 1, wherein the light guiding microstructure is formed to protrude from the reflecting surface, and the light guiding microstructure comprises a center line, the center line is perpendicular to the reflecting surface, The circular plane of the light guiding microstructure is located outside the reflecting surface. The light guide plate of claim 1, wherein the light guiding microstructure is formed to protrude from the reflecting surface and define a bottom plane on the reflecting surface, wherein the circular plane of the light guiding microstructure is located An outer side of the reflecting surface, the light guiding microstructure comprises a center line extending obliquely from a center of the circular plane toward a light-incident side to a center of the bottom plane, and the center line passes through One of the normals of the center of the circular plane has an included angle, and the included angle is an acute angle. The light guide plate of claim 1, wherein the light guiding microstructure is formed to protrude from the reflecting surface, and a circular plane of the light guiding microstructure is located outside the reflecting surface, the light guiding microstructure a center line is included, and the inclined peripheral surface of the light guiding microstructure comprises a first plain line facing the light incident side and a second plain line facing away from the light incident side, the first plain line and the The second prime line is located on opposite sides of the center line along the light incident direction, and the outer angle of the first prime line relative to the reflective surface forms an angle with the outer corner of the second plain line relative to the reflective surface. And so that the light guiding microstructure is asymmetrical. The light guide plate of claim 1, wherein the light guiding microstructure is recessed from the reflective surface, and the light guiding microstructure comprises a center line, the center line is perpendicular to the reflecting surface, The circular plane of the light guiding microstructure is located inside the reflecting surface. The light guide plate of claim 1, wherein the light guiding microstructure is recessed inward from the reflecting surface and defines an opening on the reflecting surface, and the circular plane of the light guiding microstructure is located in the reflection On the inner side of the face, the light guiding microstructure comprises a center line extending obliquely from the center of the circular plane toward the side of the light incident side to the center of the opening, and the center line and the passing center One of the normals of the center of the plane of the circle has an angle, and the angle is an acute angle. The light guide plate of claim 1, wherein the light guiding microstructure is recessed inward from the reflecting surface, and a circular plane of the light guiding microstructure is located inside the reflecting surface, the light guiding microstructure a center line is included, and the inclined peripheral surface of the light guiding microstructure comprises a first plain line facing the light incident side and a second plain line facing away from the light incident side, the first plain line and the The second prime lines are respectively located on opposite sides of the center line along the light incident direction, and an inner angle of the first prime line relative to the reflective surface and an inner angle of the second prime line relative to the reflective surface are formed. The angles are not equal, causing the light guiding microstructure to form an asymmetry. The light guide plate according to any one of claims 1 to 7, wherein the light-emitting surface of the light guide plate is formed with a plurality of light-emitting microstructures. A backlight module, comprising: the light guide plate according to any one of claims 1 to 8, wherein at least one optical film is disposed outside the light emitting surface of the light guide plate; and a light source is disposed on the light guide plate An outer side of the light incident side of the light guide plate, and a light exiting direction of the light source faces the light incident side. A display device comprising: the backlight module of claim 9; and a display panel mounted on an outer side of the optical film of the backlight module.