KR20000030582A - Manufacturing method light guide plate of back light unit - Google Patents

Abstract

PURPOSE: A method of manufacturing a light guiding plate is to rapidly and precisely form a dot and maintain a clean manufacturing environment. CONSTITUTION: A light guiding plate for a luminescent body of a rear face of a liquid crystal displaying device is manufactured by an apparatus comprising a metal roller(51) which has a higher hardness then an acrylic plate and pyramid type protrusions are formed on a surface thereof, a ball bearing (52) rotatable supporting the metal roller, a pipe type heater(53) for heating the metal roller, a linear or curve type roller guiding block(54) for adjusting a depth of the pyramid pattern engraved on the acrylic plate and a regulating bolt(55) for adjusting a declination of the guiding block. The pyramid patterns are engraved on the acrylic plate by the heated metal roller.

Description

Manufacturing method of light guide plate for back light of liquid crystal display device {Manufacturing method light guide plate of back light unit}

The present invention relates to a back light-emitting body (back light unit) of a liquid crystal display (LCD).

The present invention relates to a method of manufacturing a light guide plate, among others.

In general, a liquid crystal display (LCD) used in an image display unit of a notebook computer or a monitor display device of a desktop computer is a light-receiving element that cannot emit light by itself, and requires a rear light emitter behind the liquid crystal display (Fig. 1).

1 shows a fluorescent lamp 11, which is a light emitting source, a lamp cover 12 for reflecting light from a fluorescent lamp and fixing a lamp, and a linear light source of the fluorescent lamp as a flat light source. The light guide plate 13 and the screen printing method (FIG. 3), the diffusing sheet 15 which diffuses the diffused light uniformly, and the path of the light emitted from the diffusing sheet It consists of the prism sheet 16 to be converted, and the protective sheet 17 which protects the prism sheet, and the reflective sheet 14 which reflects light under the light guide plate.

According to the conventional manufacturing method of the light guide plate for the back light-emitting body of the liquid crystal display configured as described above, as shown in FIG. 2, the sharp bite 22 is linearly repeatedly moved from side to side and up and down on the transparent acrylic plate 21 to form a V-shaped straight line on the acrylic surface. A screen printing method (FIG. 3) in which a lattice portion is formed (V-cutting), and the squeegee 32 is moved left and right using the screen mesh 33 to print a dot (DOT) on the transparent acrylic plate 31, Such as injection method (FIG. 4) in which the acrylic liquid solution melted in the injection mold constituting the upper plate 41 and the lower plate 42 having a smooth surface by chemical corrosion method is pushed into the mold through the mold inlet 43. The manufacturing method and the V (V) cutting method (Fig. 2) has a problem that it takes a lot of time and processing time to remove acrylic dust during cutting, and the injection method (Fig. 4) is expensive injection equipment cost, mold processing time, Screen printing (Figure 3) is harmful to human body Use inks, thinners, cleaners, and there is a problem that the ink drying time consuming.

The present invention has been devised in view of the above-described problems, and thus it is possible to maintain accurate dot (DOT) formation and a clean manufacturing environment faster than the light guide plate manufacturing method, and has an object of manufacturing a large quantity of light guide plates at low cost.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic diagram which showed the structure of the conventional back light-emitting body (back light unit).

Figure 2 is a perspective view of a manufacturing method of the breaking of the conventional light guide plate manufacturing method.

Figure 3 is a perspective view of the screen printing method of the conventional light guide plate manufacturing method.

Figure 4 is a perspective view of a mold injection method of a conventional light guide plate manufacturing method.

Figure 5 is a perspective view of the light guide plate manufacturing method according to the present invention.

6 is a schematic diagram showing a structure of a back light-emitting body (back light unit) according to the present invention.

The present invention for achieving the above object is a roller having a pyramid shape having the same pyramid-shaped protrusions (58) on the surface and a metal roller (51) having a higher hardness than acrylic and a ball bearing (52) to help the rollers rotate smoothly. Heater 53 in the form of a pipe that can apply heat to the roller, and a linear or curved roller guide block 54 that can adjust the depth of the projection of the intaglio pyramid on the transparent acrylic surface, and the inclination of the guide block can be adjusted. The adjusting bolt 55 is a main member. Insert a heater 53 with a thermostat attached to the metal hollow roller 51 with the embossed pyramid-shaped protrusion to maintain the acrylic deformation temperature on the embossed pyramid shape 58 on the surface of the roller 51 and the transparent acrylic plate. When the roller 51 is moved according to the linear or curved roller guide block 54 which can change the inclination from left to right or right to left after contacting the 56, the roller 51 simultaneously rotates. An intaglio pyramid shape 57 can be made on the surface of the transparent acrylic 56, and the depth adjustment of the intaglio pyramid shape is performed by the surface of the roller guide block 54 in contact with the bearing 52 of the roller 51 (straight or curved). The shape and the change in the inclination of the guide block 54 due to the vertical movement of the inclination adjustment bolt 55 of the guide block 54 control the amount of contact between the roller pyramid protrusion 58 and the transparent acrylic 56 surface. It is possible to adjust the depth of the intaglio pyramid shape 57. Since the depth is proportional to the area of the intaglio pyramid shape 57, the linear light source 61 of the back light emitter (backlight unit) in FIG. The incident light is diffused by the negative pyramid shape 63 and escapes to the upper surface of the transparent acrylic plate to form a planar light source. The roller 51 having the protrusion of the shape can adjust the amount of contact with the surface of the transparent acrylic 56 according to the surface shape of the guide block 54 and the inclination of the guide block, so that the back light emitter having a desired brightness (brightness of light) Can make light guide plate.

As described above, according to the manufacturing method of the light guide plate according to the present invention, as compared with the above-described other manufacturing method, a light guide plate capable of exhibiting desired luminance (brightness of light) at a desired position on the transparent acrylic surface is developed and manufactured at a low cost. It becomes possible.

Claims (4)

Light guide plate manufacturing method characterized in that the rotation of the circular roller having a projection shape on the surface. The method of claim 1, wherein the roller rotates by applying a rotational force to the circular roller. The method of claim 1, wherein the roller is rotated by the movement of an object in contact with the circular roller. The method according to claim 1 or 2, To guide the rotation of the circular roller and the circular roller and to change the tilt A light guide plate manufacturing method characterized by a guide block.