TWI396623B - Prism sheet and method for making the same - Google Patents

Description

Bract and its manufacturing method

The present invention relates to a cymbal sheet and a method of manufacturing the same.

Referring to FIG. 1, a liquid crystal display device 100 using a conventional wafer is shown. The liquid crystal display device 100 includes a frame 11 and 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, a die 10, and a liquid crystal panel 15. The diffusing plate 13 generally contains scattering particles for diffusing light. As shown in FIG. 2, the cymbal 10 includes a transparent substrate 101 and a lens layer 103 formed on the transparent substrate 101. The lens layer 103 has a plurality of elongated V-shaped projections 105 thereon. Each of the elongated protrusions 105 extends from one side of the gusset to the other side, and the plurality of elongated protrusions 105 are continuously arranged side by side. The lens layer 103 is generally formed by coating an ultraviolet curing resin on the transparent substrate 101 and curing it by light.

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 a certain extent under the action of the elongated protrusion 105 of the cymbal 10, thereby The brightness of the liquid crystal display device 100 over a specific viewing angle range is increased.

However, since the plurality of elongated protrusions 105 are continuously arranged side by side, in use, the continuous strip-shaped protrusions 105 are successively arranged side by side with the liquid crystal panel 15 The arrangement of the liquid crystal display device 100 is likely to cause moiré interference, thereby affecting the display effect of the liquid crystal display device 100.

In order to avoid the occurrence of moiré interference, an upper diffusion sheet 14 is usually disposed between the cymbal 10 and the liquid crystal panel 15. The upper diffusion sheet 14 also has the function of diffusing light, and the light is further scattered by the upper diffusion sheet 14 to prevent the occurrence of the moiré interference phenomenon when the liquid crystal display device 100 is displayed. However, when light is transmitted in the upper diffusion sheet 14, part of the light is absorbed by the upper diffusion sheet 14 to cause partial light loss; and the use of the upper diffusion sheet 14 also increases the number of interfaces of the light during transmission, thereby increasing light transmission. Since the interface is lost, the use of the upper diffusion sheet 14 reduces the utilization of light, and the display brightness of the liquid crystal display device 100 is lowered.

In view of the above circumstances, it is necessary to provide a cymbal sheet having high brightness and avoiding moiré interference and a method of manufacturing the same.

A method for manufacturing a cymbal sheet, comprising: providing a rotary cutting device for rotating a molding surface of a mold core, the rotary cutting device comprising an axially rotatable cutting edge and a displacement control unit opposite to the cutting edge, the displacement control unit To control the relative displacement of the mold to the blade; the cutting edge cuts the molding surface of the mold to form a plurality of elongated grooves, and in the process of forming at least one elongated groove therein, the displacement control unit makes the relative of the mold to the blade The displacement period is changed such that the depth and width of the at least one elongated groove periodically change with the direction in which it extends; and the die is formed by the mold.

A cymbal piece, which is composed of a transparent body, the surface of the transparent body is formed with a plurality of elongated protrusions, and the trajectory of the height of each of the elongated protrusions along the extending direction is a wavy continuous curve, and each elongated strip is convex The two opposite sides are formed by extending from the transparent body, and the distance between the two sides of the transparent body is larger than the distance from the transparent body, and the two sides are undulating continuous curved surfaces in the extending direction.

Compared with the prior art, the transparent body surface of the above-mentioned cymbal has a plurality of elongated protrusions, and the height and width of at least one elongated protrusion periodically change with the extending direction thereof. Therefore, the plurality of elongated protrusions are not easily formed to overlap with the array arrangement of the liquid crystal panel elements, thereby avoiding the occurrence of moiré interference. Moreover, since the liquid crystal display device using the cymbal has the advantage of avoiding the interference of the embossing, it is not necessary to prevent the occurrence of the embossing interference to generate the upper diffusion sheet, thereby avoiding the light loss caused by the provision of the upper diffusion sheet, and therefore, the cymbal is used. The liquid crystal display device has the advantage of high brightness.

200‧‧‧Liquid crystal display device

20, 30‧‧‧ Picture

201‧‧‧ first surface

203‧‧‧ second surface

205, 305‧‧‧ long strips

21‧‧‧Frame

22‧‧‧Light source

23‧‧‧Diffuser

25‧‧‧LCD panel

33‧‧‧Rotary cutting device

331‧‧‧blade

333, 433‧‧‧ Displacement Control Unit

3331‧‧‧Cam

4331‧‧‧ Piezoelectric module

4332‧‧‧Signal Generation Module

3333, 4333‧‧‧ Workbench

35‧‧‧Men

351‧‧‧ molding surface

3511‧‧‧Long strip groove

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a cross-sectional view showing a liquid crystal display device using a conventional ruthenium.

2 is a perspective view of a cymbal of the liquid crystal display device shown in FIG. 1.

Fig. 3 is a cross-sectional view showing a liquid crystal display device using a cymbal sheet according to a preferred embodiment of the present invention.

4 is a perspective view of a cymbal of the liquid crystal display device shown in FIG. 3.

Figure 5 is a schematic cross-sectional view of the cymbal of Figure 4 taken along line V-V.

Figure 6 is a perspective view of a cymbal according to a preferred embodiment of the present invention.

Fig. 7 is a schematic view showing a preferred embodiment 1 of a rotary cutting device for manufacturing a mold core for forming a sheet.

Fig. 8 is a schematic view showing a mold core manufactured by using the rotary cutting device shown in Fig. 7.

Figure 9 is a cross section of the mold core shown in Figure 8 taken along line IX-IX.

Fig. 10 is a schematic view showing a second preferred embodiment of a rotary cutting device for manufacturing a mold for forming a sheet.

The cymbal sheet and the method of manufacturing the same according to the accompanying drawings and the plurality of embodiments will be further described in detail below.

Referring to FIG. 3, a liquid crystal display device 200 using the cymbal sheet 20 of the preferred embodiment of the present invention is shown. The liquid crystal display device 200 includes a frame 21 and a plurality of light sources 22 disposed inside the frame 21, a diffusion plate 23 disposed above the light source 22 and covering the frame 21, a die 20 and a liquid crystal panel 25.

Referring to FIG. 4 and FIG. 5 together, the cymbal 20 is formed by a transparent body including a first surface 201 and a second surface 203 opposite the first surface 201. The first surface 201 faces the diffusion plate 23, and the second surface 203 faces the liquid crystal panel 25. The second surface 203 has a plurality of elongated protrusions 205, and the height H and the width W of each of the elongated protrusions 205 vary along the extending direction (X direction) of the elongated protrusions 205. In this embodiment, the extending direction of the elongated protrusions 205 (ie, the X direction) is parallel to one of the sides of the cymbal sheet 20. It can be understood that the extending direction of the elongated protrusions 205 can also be associated with the cymbal 20 One side is at an angle.

The plurality of elongated protrusions 205 extend in the same direction, and each elongated protrusion 205 is along The cross section perpendicular to the extending direction thereof may be V-shaped or trapezoidal, and is preferably V-shaped in this embodiment, and the center-pitch P of the adjacent elongated protrusions 205 may be 0.025 mm to 1 mm, and the apex angle θ of the cross-section is 85 degrees to 95 degrees.

The thickness T of the cymbal sheet 20 can be from 0.4 mm to 4 mm. The material of the cymbal sheet 20 may be one or more of polymethyl methacrylate, polycarbonate, polystyrene, and styrene-methyl methacrylate copolymer.

The frame 21 may be made of metal or plastic having high reflectivity or metal or plastic coated with a high reflectivity coating.

During operation, the light emitted by the light source 22 directly enters or enters the diffusing plate 23 by the reflection of the frame 21, and under the action of the diffusing plate 23, the light is uniformly diffused and then enters the cymbal 20. When the light hits the plurality of elongated protrusions 205 on the second surface 203 of the cymbal 20, the elongated protrusions 205 allow the light to gather near the cymbal 20 and emerge from the second surface 203, thereby The display brightness of the region of the liquid crystal display device 200 near the direction perpendicular to the cymbal 20 is increased. Since the height H and the width W of the elongated protrusion 205 vary along the extending direction of the elongated protrusion 205, the surface has a varying surface structure, and there is no arrangement of a plurality of elongated protrusions and an array of liquid crystal panel elements. The overlap of the cloths to avoid the occurrence of moiré interference. Moreover, since the liquid crystal display device 200 using the cymbal 20 has the advantage of avoiding the moiré interference, it is not necessary to provide the diffusion sheet to prevent the occurrence of the moiré interference, thereby avoiding the light loss caused by the provision of the upper diffusion sheet. The liquid crystal display device 200 of the cymbal 20 has the advantage of high brightness.

It can be understood that the second surface 203 can also be used to face the diffusion plate 23 with the first surface 201 facing away from the diffusion plate 23.

Referring to Figure 6, there is shown a die 30 of a preferred embodiment of the present invention. The crotch panel 30 is similar to the crotch panel 20 of the first embodiment. The second surface of the crotch panel 30 has a plurality of elongated protrusions 305, the difference being that each elongate projection 305 has a trapezoidal shape along a section perpendicular to its extending direction. The angle between the trapezoidal waists may preferably be 85 degrees to 95 degrees.

A method of manufacturing a cymbal 20 comprising the steps of providing a rotary cutting device 33 as shown in FIG. 7, which can rotate a forming surface 351 of a cutting die 35. The rotary cutting device 33 includes a blade 331 that is rotatable along the Z axis and a displacement control unit 333 that opposes the blade 331. The contour of the center section of the blade 331 is triangular, and the apex angle of the triangle is 85 to 95 degrees. The displacement control unit 333 includes a cam 3331 and a table 3333 disposed on the cam 3331 for carrying the mold core 35. The table 3333 is perpendicular to the Z axis, and the relative displacement period of the mold core 35 to the blade edge 331 is periodically changed by the rotation of the cam 3331 to manufacture the mold core 35 shown in FIGS. 8 and 9.

The cutting edge 331 cuts the mold forming surface 351 to form a plurality of elongated grooves 3511 having the same extending direction, and the distance between the adjacent elongated grooves 3511 is 0.025 mm to 1 mm. During the process of cutting the mold forming surface 351 of the cutting edge 331 to form any one of the elongated grooves 3511, the cutting edge 331 moves in a certain direction M, and at the same time, the rotation of the cam 3331 causes the relative displacement period of the working table 3333 to the cutting edge 331 to change. Further, the relative displacement period of the mold core 35 to the blade edge 331 is changed, specifically: when convex When the wheel A is held by the table 3333, the relative displacement between the table 3333 and the blade 331 is the shortest, so that the blade 331 is inserted deeper into the mold 35, and the contour of the central section of the blade 331 is triangular and the blade 331 is continuously The rotary motion, the corresponding groove 3511 is also deep, and the opening of the groove 3511 is wider; when the cam B points hold the table 3333, the relative displacement between the table 3333 and the blade 331 is the longest, so that the blade 331 is inserted. The mold core 35 is shallow, and the contour of the central section of the cutting edge 331 is triangular and the cutting edge 331 is continuously rotated. The corresponding groove 3511 is also shallow, and the opening of the groove 3511 is narrow. The cam 3331 rotates continuously, so that the relative displacement between the table 3333 and the blade 331 continuously changes from long to short and from short to long, and the corresponding groove 3511 also becomes shallower and shallower. The period changes, and the opening corresponds to a wide and narrow periodic variation.

Then, the molding surface 351 of the mold core 35 is used as one side of the molding cavity of the injection molding die, and is injected into the molding cavity of the injection molding die and filled with the molten transparent resin material, and cooled to form the blade 20. The transparent resin material may be one or more of polymethyl methacrylate, polycarbonate, polystyrene, and styrene-methyl methacrylate copolymer.

When the mold core 35 is produced, it is only necessary to add a displacement control unit 333 to the ordinary rotary cutting device, and there is no need to specially design the device. Therefore, the method is simple in operation and low in cost.

In addition, the conventional ruthenium film is formed by a method of coating a resin film to form a microstructure on a transparent plate. Compared with the two, the film 20 of the present invention has no light interface loss and has higher light utilization rate; And the cymbal 20 of the present invention It can be manufactured in one time, making it easier to achieve rapid mass production and reduce costs. In addition, the conventional method applies a resin film forming microstructure on a transparent plate. Since the resin film is formed on the transparent substrate, the thickness of the two is relatively thin, the strength of the cymbal sheet is low, and the warp deformation is easy, and the present invention adopts the injection molding method and the rib. The elongated protrusion 205 of the lens 20 is integrally formed, and the elongated protrusion 205 and the body of the cymbal are integrally formed, and the thickness is relatively thick, and has high structural strength, which can avoid or reduce warpage deformation during use. The danger.

It can be understood that the projection profile of the blade tip in a direction perpendicular to the blade axis direction may also be curved or trapezoidal. Correspondingly, in the correspondingly formed crotch, the section perpendicular to the direction in which the protrusion extends is curved or trapezoidal. When the projection top of the blade is trapezoidal in a direction perpendicular to the axis of the blade, the angle between the trapezoidal waists may be 85 degrees to 95 degrees.

It can be understood that the displacement control unit 333 can also be replaced with other forms. For example, as shown in FIG. 10, the displacement control unit 433 includes a piezoelectric material module 4331, a signal generating module 4332 for exciting the piezoelectric material module 4331, and a work disposed on the piezoelectric material module 4331. Taiwan 4333. The piezoelectric material module 4331 supports the worktable 4333, and the signal generating module 4332 generates a signal-excited piezoelectric material module 4331 to change the volume of the piezoelectric material module 4331, thereby changing the relative displacement of the working table 4333 to the cutting edge. . When the signal is generated as a periodic signal, the relative displacement period of the table 4333 to the blade changes periodically, thereby changing the relative displacement period of the die to the blade. It can be understood that the signal generated by the signal generating module 4332 can also be a non-periodic signal, so that the depth and width of the long strip-shaped groove on the corresponding mold are non-periodically changed according to the extension thereof, and the mold is used. The height and width of the long strip-shaped projections of the cymbal are also aperiodically varied with the direction in which they extend.

It can be understood that the plurality of elongated grooves on the mold core may also be a part or only one of the elongated grooves whose depth and width vary with the extension.

It can be understood that the method of forming the cymbal sheet 20 can be, for example, injection molding, or a method such as hot press molding. The specific method of hot press forming is to provide a transparent resin substrate, which is heated by the mold core 35, and then the molding surface 331 of the mold core 35 is pressed against the transparent resin substrate to form the above-mentioned cymbal sheet 20.

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.

20‧‧‧ Picture

201‧‧‧ first surface

203‧‧‧ second surface

205‧‧‧Large bulges

Claims (12)

A method for manufacturing a cymbal sheet, comprising: providing a rotary cutting device for rotating a molding surface of a mold core, the rotary cutting device comprising an axially rotatable cutting edge and a displacement control unit opposite to the cutting edge, the displacement control unit To control the relative displacement of the mold to the blade; the cutting edge cuts the molding surface of the mold to form a plurality of elongated grooves, and in the process of forming at least one elongated groove therein, the displacement control unit makes the relative of the mold to the blade The displacement period is varied such that the depth and width of the at least one elongated groove periodically change with the direction of extension thereof; and the die is formed by the mold. The method of manufacturing a cymbal according to claim 1, wherein the displacement control unit comprises at least one cam. The manufacturing method of the cymbal according to claim 2, wherein the displacement control unit comprises a table disposed on the cam, the table being configured to carry the mold. The method for manufacturing a cymbal according to claim 1, wherein the displacement control unit comprises a piezoelectric material module and a signal generating module for exciting the piezoelectric material module. The manufacturing method of the cymbal sheet of claim 4, wherein the displacement control unit comprises a table disposed on the piezoelectric material module, the table being configured to carry the mold core. The method for manufacturing a cymbal according to claim 1, wherein the projection contour of the blade tip perpendicular to the blade axis direction is a triangle, an arc, and a ladder. One of the forms. The manufacturing method of the cymbal sheet according to the first aspect of the invention, wherein the projection edge of the blade edge in a direction perpendicular to the blade axis direction is a triangle, and the apex angle of the triangle is 85 degrees to 95 degrees. The manufacturing method of the cymbal sheet according to the first aspect of the invention, wherein the projection of the blade tip in a direction perpendicular to the axis of the blade is trapezoidal, and the angle between the trapezoidal waists is 85 to 95 degrees. The method for manufacturing a cymbal according to claim 1, wherein the elongated grooves extend in the same direction, and the distance between adjacent elongated grooves is 0.025 mm to 1 mm. The method for producing a plaque according to the first aspect of the invention, wherein the ram is formed by injection molding. A cymbal piece is formed by a transparent body, and the surface of the transparent body is formed with a plurality of elongated protrusions, and the improvement is that the trajectory of the height of each elongated protrusion along the extending direction is a wavy continuous curve, and each The elongated protrusion has two opposite sides extending from the transparent body, and the distance between the two sides of the transparent body adjacent to the transparent body is greater than the distance from the transparent body, and the two sides are undulating continuous curved surfaces in the extending direction. . The bracts of claim 11, wherein the bracts have a thickness of from 0.4 mm to 4 mm.