TWI390253B - Prism sheet and backlight module using the same - Google Patents

Description

Backlight module and its chip

The invention relates to a backlight module and a cymbal thereof, in particular to a backlight module for liquid crystal display and a cymbal thereof.

Referring to FIG. 1 , a conventional direct type backlight module 100 includes a frame 11 , a plurality of light sources 12 disposed inside the frame 11 , a diffusion plate 13 disposed above the light source 12 and covering the frame 11 , and A piece of film 10. The diffusing plate 13 generally contains scattering particles for diffusing light. The cymbal 10 includes a light incident surface 101 for receiving a light beam, a light exit surface 103 opposite to the light incident surface 101, and a plurality of elongated V-shaped projections 105 formed on the light exit surface 103.

In use, after the light generated by the complex light source 12 is uniformly diffused into the diffusing plate 13, it continues to enter the cymbal 10, and the emitted light is concentrated to some extent under the action of the elongated V-shaped projection 105 of the cymbal 10. Thereby, the brightness of the backlight module 100 within a certain viewing angle range is improved.

Referring to FIG. 2 and FIG. 3 together, the light becomes uniform after being diffused by the diffusion plate 13, but the angle at which the scattered light is incident on the cymbal 10 becomes disordered. The disordered light enters the cymbal 10 and exits at the interface of the V-shaped protrusion 105. Part of the emitted light (such as a1, a2) is concentrated in a direction close to the vertical direction (ie, parallel to the Y-axis), and the portion of the emitted light can be emitted. Increasing the brightness of the front surface of the backlight module 100; however, part of the emitted light (eg, a3, a4) is emitted toward the horizontal direction (X-axis direction) at the interface of the V-shaped protrusion 105, and the portion of the emitted light is not effectively utilized; There is still some light (such as a5, a6) which is refracted at the interface of the V-shaped protrusion 105 and then re-entered into the cymbal 10, in which the light energy loss is large. In addition, the plurality of V-shaped protrusions 105 of the cymbal 10 are arranged in parallel, and the effect of focusing on the light mainly occurs on a plane perpendicular to the extending direction of the V-shaped protrusion 105, and the direction of extension of the V-shaped protrusion 105. The light in parallel planes has no aggregation, so that the part of the light is not effectively utilized.

In view of the above situation, it is necessary to provide a backlight module and a chip which can improve the effective utilization of light and high brightness.

A cymbal sheet consisting of a transparent body comprising a first surface and a second surface opposite the first surface. The first surface and the second surface of the transparent body each have a plurality of micro-grooves, each micro-groove includes four inner sides sequentially connected, and the horizontal width of each inner side is from the surface of the micro-groove to the cymbal slowing shrieking.

A backlight module includes a light source, a diffusion plate and a cymbal plate. The diffusion plate and the cymbal plate are sequentially disposed above the light source. The cymbal piece is composed of a transparent body, and the transparent body includes a first surface and the first The surface is opposite the second surface. The first surface and the second surface of the transparent body each have a plurality of micro-grooves, each micro-groove includes four inner sides sequentially connected, and the horizontal width of each inner side is from the surface of the micro-groove to the cymbal slowing shrieking.

The first surface and the second surface of the cymbal have a plurality of micro-grooves. Since the micro-groove has an inclined surface structure, the inclined surface structure of the micro-groove of the first surface and the micro-groove of the second surface are inclined The surface structure cooperates to cooperate with the light incident on the cymbal, so that the backlight module using the cymbal can improve the effective utilization of light and the brightness of the emitted light.

The backlight module and the cymbal of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

Referring to FIG. 4 , a backlight module 200 according to a preferred embodiment of the present invention includes a cymbal 20 and a diffusion plate 21 disposed on one side of the cymbal 20 , a plurality of light sources 22 , and a plurality of light sources 22 . Frame 23. The crotch panel 20 and the diffuser plate 21 cover the frame 23. The light emitted from the light source 22 is reflected directly or by the frame 23 into the diffusing plate 21, diffused through the diffusing plate 21, and then enters the cymbal 20 to be collected.

Referring to FIG. 5, the cymbal 20 is formed by a transparent body including a first surface 201 and a second surface 202 opposite the first surface 201. The first surface 201 has a plurality of first micro-grooves 203, and the second surface 202 has a plurality of second micro-grooves 204.

Referring to FIG. 4 and FIG. 6, the first surface 201 faces the diffusion plate 21, and the first micro-groove 203 thereon is used to converge the light incident on the cymbal 20. The second surface 202 faces away from the diffuser plate 21, and the second microgrooves 204 thereon serve to concentrate the light emerging from the cymbal 20. In this embodiment, the plurality of first micro-grooves 203 are arranged in a regular array. Each of the first micro-grooves 203 includes four inner side faces that are sequentially connected, and the inner side faces of the first micro-grooves 203 are two opposite-isometric four-isometric triangles, that is, the first micro-grooves 203 have a quadrangular pyramid shape. In the X direction, the center distance X ₁ of the adjacent first micro grooves 203 ranges from 0.025 mm to 1 mm; in the Y direction, the center distance Y ₁ of the adjacent first micro grooves 203 takes the value The range is from 0.025 mm to 1 mm. By adjusting the aspect ratio of the first micro-grooves 203, the brightness enhancement and the viewing angle of the cymbal 20 can be adjusted.

In this embodiment, the plurality of second micro-grooves 204 are also quadrangular pyramid-shaped and arranged in a regular array. The center-to-center spacing of the adjacent second micro-grooves 204 in the X direction and the Y direction satisfies the above-mentioned X ₁ , Y ₁ Ranges. It should be noted that the angle formed by the opposite sides of the first micro-grooves 203 on the first surface 201 is equal, and is defined as S ₁ , and the value of S ₁ ranges from 45 degrees to 120 degrees; the second surface The angle between the opposite sides of the second micro-grooves 204 on the 202 is equal, and is defined as S ₂ , and the value of S ₂ ranges from 60 degrees to 120 degrees. In order to make the first micro-groove 203 of the first surface 201 have a better ray convergence effect, the angle S ₁ formed by the opposite inner side surfaces of the first micro-grooves 203 on the first surface 201 is preferably 45 degrees. To 90 degrees. Moreover, in order to avoid interference of light in the process of passing through the cymbal 20, the first micro-groove 203 of the first surface 201 and the second micro-groove 204 of the second surface 202 are generally staggered, that is, the first dimple The center of the groove 203 is located between two adjacent second micro grooves 204.

It can be understood that the angle formed by the opposite sides of the first micro-groove 203 and the second micro-groove 204 may not be equal. By adjusting the angle of the angle, the brightness enhancement and the viewing angle of the optical plate can be adjusted.

The overall thickness of the crotch panel 20 can range from 0.5 mm to 3 mm. The cymbal sheet 20 may be injection molded from one or more of polymethyl methacrylate, polycarbonate, polystyrene, and styrene-methyl methacrylate copolymer. During the preparation process, a convex structure corresponding to the first micro-groove 203 and the second micro-groove 204 is disposed on the mold, so that the cymbal sheet 20 can be formed in a single injection molding process.

Light source 22 can be a line source or a point source, such as a light emitting diode and a cold cathode fluorescent lamp.

The frame 23 may be made of metal or plastic having high reflectivity or metal or plastic coated with a high reflectivity coating.

Since the first micro-groove 203 on the first surface 201 of the cymbal 20 and the second micro-groove 204 on the second surface 202 have inclined surface structures at different angles, the inclined surface structure of the first micro-groove 203 The inclined surface structures of the two micro-grooves 204 cooperate to cooperate with the light incident on the cymbal 20, so that the backlight module 200 using the cymbal 20 is easy to improve the effective utilization of light and the brightness of the emitted light.

Specifically, in the embodiment, when the light enters the cymbal 20 from the first surface 201, since the first surface 201 has a plurality of first micro-grooves 203, the surface structure of the first micro-grooves 203 is inclined such that the light is perpendicular to the ribs. The direction of the lens 20 converges to a certain extent; when the light exits from the second surface 202, since the second surface 202 has a plurality of second micro-grooves 204, the surface structure of the second micro-grooves 204 is inclined such that the outgoing rays are perpendicular to The direction of the cymbal 20 is further gathered, so that the brightness of the backlight module 200 can be greatly improved. At the same time, since the first surface 201 converges most of the light to a direction perpendicular to the cymbal 20 when the light enters the cymbal 20, when the light is emitted from the second surface 202, it is parallel to the cymbal 20. Less light is emitted, which reduces the light that is returned to the cymbal 20 again and allows more light to be effectively utilized.

Further, since the first micro-grooves 203 and the second micro-grooves 204 are both quadrangular pyramid-shaped, which have four inner sides connected in sequence, the light is emitted regardless of the X-Z plane or the Y-Z plane. All can be effectively gathered to fully utilize the light in all directions to further improve the brightness of the front side of the backlight module 200.

In addition, the cymbal sheet 20 is integrally formed by injection molding, and the conventional cymbal sheet is formed by coating a transparent film with a resin film forming microstructure, and the cymbal sheet 20 is easier to achieve rapid mass production and lower cost. In addition, when used, there is no light interface loss in the cymbal 20, and the light utilization rate is higher. In addition, the conventional method applies a resin film forming microstructure on a transparent plate, and since the bonding force between the coated resin film and the transparent plate is generally low and the resin film itself is difficult to form high strength, the microstructure is easily scratched and pressed. The first micro-grooves 203 and the second micro-grooves 204 are formed together with the other portions of the cymbal 20, so that the first micro-grooves 203 and the second dimples are formed by the injection molding method. The groove 204 has a higher structural strength, and at the same time, can improve the bonding force between the first micro groove 203 and the second micro groove 204 and other portions of the cymbal 20, so that the first micro groove 203 and the first The two micro-grooves 204 are at risk of being damaged during use of the cymbal 20.

It can be understood that the second surface 202 can also be used to face the diffusion plate 21 with the first surface 201 facing away from the diffusion plate 21.

Referring to Figure 7, there is shown a die 30 of a preferred embodiment of the present invention. The cymbal sheet 30 is similar to the cymbal sheet 20 of the first embodiment except that the first micro-grooves 303 of the first surface 301 are arranged in a regular array.

Referring to Figure 8, there is shown a third embodiment of a third embodiment of the present invention. The cymbal 40 is similar to the cymbal 20 of the first embodiment, except that the first micro-groove 403 of the first surface 401 has a quadrangular shape, and the shape of the groove bottom 4031 and the notch 4032 are square, first The micro-grooves 403 are arranged in a regular array of spaces.

Referring to Figure 9, there is shown a topsheet 50 of a preferred embodiment of the present invention. The cymbal sheet 50 is similar to the cymbal sheet 20 of the first embodiment, except that the first micro-groove 503 of the first surface 501 is quadrangular-shaped, and the shape of the groove bottom 5031 and the notch 5032 are both rectangular, first The micro-grooves 503 are arranged in a regular array of intervals.

It can be understood that in the above-mentioned cymbal, the array direction of the micro-grooves can also form an acute angle with the side edges of the cymbal.

It can be understood that the structures of the first micro-grooves on the first surface of the preferred embodiment 2, the preferred embodiment 3 and the preferred embodiment 4 can also be applied to the second surface, and the micro-groove structures on both surfaces can be Different, for example, the first micro-groove of the first surface has a quadrangular pyramid shape, and the second micro-groove of the second surface has a quadrangular prism shape; or the first micro-groove of the first surface is a groove bottom and a notch The shape is a square quadrangular shape, and the second micro-groove on the second surface is a groove bottom, and the shape of the notch is a rectangular quadrangular shape.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above description is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and those skilled in the art will be equivalently modified or changed in the spirit of the invention. All should be included in the scope of the following patent application.

(this invention)

Backlight module. . . 200

Bracts. . . 20, 30, 40, 50

The first surface. . . 201, 301, 401, 501

Second surface. . . 202

The first micro groove. . . 203, 303, 403, 503

Second micro groove. . . 204

The first micro groove groove bottom. . . 4031, 5031

The first micro-groove slot. . . 4032, 5032

Diffuser plate. . . twenty one

light source. . . twenty two

frame. . . twenty three

FIG. 1 is a schematic cross-sectional view of a conventional backlight module.

2 is a perspective view of a cymbal of the backlight module shown in FIG. 1.

Fig. 3 is a schematic view showing the light exiting along the line III-III of the cymbal shown in Fig. 2.

4 is a cross-sectional view of a backlight module in accordance with a preferred embodiment of the present invention.

FIG. 5 is a perspective view of the cymbal of the backlight module shown in FIG. 4.

Figure 6 is a bottom plan view of the cymbal of the backlight module of Figure 4.

Figure 7 is a bottom plan view of a cymbal according to a preferred embodiment of the present invention.

Figure 8 is a bottom plan view of a third embodiment of the preferred embodiment of the present invention.

Figure 9 is a bottom plan view of the cymbal of the preferred embodiment of the present invention.

Backlight module. . . 200

Bracts. . . 20

The first surface. . . 201

Second surface. . . 202

The first micro groove. . . 203

Second micro groove. . . 204

Diffuser plate. . . twenty one

light source. . . twenty two

frame. . . twenty three

Claims (17)

A cymbal sheet is a transparent body, the transparent body includes a first surface and a second surface opposite to the first surface, and the improvement is that the first surface and the second surface of the transparent body each have a plurality of micro grooves Each of the micro-grooves includes four inner sides that are sequentially connected, and the horizontal width of each inner side gradually decreases from the surface where the micro-groove is located to the inside of the cymbal. The cymbal of claim 1, wherein the plurality of micro-grooves are quadrangular pyramid-shaped grooves or quadrangular-shaped grooves. The cymbal of claim 2, wherein an angle between two opposite inner sides of each microgroove of the first surface is 45 degrees to 120 degrees, and each of the micro grooves of the second surface The angle between the opposite inner sides is 60 degrees to 120 degrees. The cymbal according to claim 1, wherein the center spacing of the adjacent micro grooves is 0.025 mm to 1 mm. The cymbal of claim 1, wherein the plurality of micro-grooves are arranged in a regular array and a regular array. The cymbal of claim 1, wherein the center of the micro-groove of the first surface is located between two adjacent micro-grooves of the second surface. The bracts of claim 1, wherein the bracts have a thickness of from 0.5 mm to 3 mm. The bracts of claim 1, wherein the bracts are one or more of polymethyl methacrylate, polycarbonate, polystyrene, styrene-methyl methacrylate copolymer. The material is injection molded. A backlight module includes a light source, a diffusion plate and a cymbal plate. The diffusion plate and the cymbal plate are sequentially disposed above the light source. The cymbal piece is composed of a transparent body, and the transparent body includes a first surface and the first The surface is opposite to the second surface, and the improvement is that the first surface and the second surface of the transparent body each have a plurality of micro-grooves, each micro-groove includes four inner sides sequentially connected, and the horizontal width of each inner side is The surface on which the micro-groove is located gradually decreases toward the inside of the cymbal. The backlight module of claim 9, wherein the first surface faces the diffusing plate, and an angle between the two opposite inner sides of each of the micro grooves of the first surface is 45 to 90 degrees. The backlight module of claim 9, wherein the second surface faces away from the diffusion plate, and the angle between the two opposite inner sides of each of the micro grooves of the second surface is 60 degrees to 120 degrees. The backlight module of claim 9, wherein the plurality of micro-grooves are quadrangular pyramid-shaped grooves or quadrangular-shaped grooves. The backlight module of claim 9, wherein the center spacing of the adjacent micro grooves is 0.025 mm to 1 mm. The backlight module of claim 9, wherein the plurality of micro-grooves are arranged in a regular array and a regular array. The backlight module of claim 9, wherein a center of the micro-groove of the first surface is located between two adjacent micro-grooves of the second surface. The backlight module of claim 9, wherein the ruthenium has a thickness of 0.5 mm to 3 mm. The backlight module of claim 9, wherein the cymbal sheet is one or more of polymethyl methacrylate, polycarbonate, polystyrene, and styrene-methyl methacrylate copolymer. The material is injection molded.