JP2005259672A - Structuring method of planar light source unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure capable of easily manufacturing uniform planer light source units having high brightness without unevenness of irradiation in commercial quantity. <P>SOLUTION: V-shaped grooves or scratches 4 are engraved on a film-shaped transparent material 51, an acrylic resin, or a glass by a conveyor roller 52 having protrusions. The planar light source part 61 is formed by adhering the transparent material 51 to a roll-shaped transparent substrate layer 53. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a structure of a backlight used for a liquid crystal display or the like and a method for constructing the backlight.

  A liquid crystal display (LCD) display is used in a liquid crystal TV, a PDA (Personal Digital Assistant), a mobile phone, and various notification boards. In particular, it is remarkably widespread as a display for television, home appliances, and OA equipment. It is expected to develop rapidly in the future because of its low power consumption, thinness, and light weight.

  Many planar light source units are used for backlights such as liquid crystal displays. As for the feature, various ideas have been made in order to achieve uniform surface emission with high illuminance. For example, an edge light type surface light source unit irradiates a liquid crystal display from behind by a surface light source unit as shown in FIG.

  As shown in the cross section of FIG. 3, the configuration of the planar light source unit includes 31 reflectors, 32 silk dots (reflective dots), 2 acrylic resin (transparent member) substrate layers, 2 adhesive layers, 4 And a condenser lens 34 for effectively and uniformly diffusing light emitted from the light source. 31 and 32 effectively reflect the light leaked from the surface light source unit part and irradiate a display such as a liquid crystal.

The V-shaped groove has been formed by carving using a special machine tool, laser light. However, it is difficult to manufacture a planar light source unit having a uniform characteristic due to poor mass productivity and high cost.
JP 2003-107216 A Japanese Patent Application No. 2002-377447 Nikkei Electronics "The ultimate production technology printing is finally out" February 16, 2004 issue Nikkei Electronics "Achieved with a single-panel dual-screen liquid crystal transparent planar light source unit" March 1, 2004 issue

  The problem to be solved is that the conventional planar light source unit has low productivity and structural defects in the uniform planar light source unit part.

  The present invention produces an effect equivalent to or better than the case where a V-shaped groove and a scratch (scratch) are provided in the surface light source unit without using a laser beam or a special cutting tool.

  V-grooves, scratches, and light guiding dots are formed on a transparent acrylic resin, glass substrate layer and film-like surface by rollers. The substrate layer and the film-like V-shaped groove are bonded together by spraying an adhesive. These manufacturing processes are characterized in that products are easily finished in an integrated process without bothering people.

  The planar light source unit portion of the present invention can be manufactured quickly and with high quality by using a roller having both a substrate layer and protrusions without using a special cutting device. The transparent substrate layer and the film-like V-shaped groove are automatically joined during the manufacturing process.

  The transparent member of the substrate layer has a plate shape and is wound in a roller shape. Since the film-like transparent member forming the V-shaped groove is also wound in a roll shape and bonded together by pressure bonding, it is effective for mass production.

  The present invention relates to a structure for efficiently and uniformly guiding light from a light emitting source to the center and to improving mass productivity.

First embodiment

  1 to 4 show a first embodiment. In FIG. 1, it is a cross section of 1st Embodiment of this invention apparatus. Reference numeral 1 denotes a constituent part of the V-shaped groove, and reference numeral 2 denotes a transparent substrate layer material that guides light without attenuation, such as an acrylic resin or a glass substrate. Reference numeral 3 denotes an adhesive for adhering the film-like V-shaped groove 4 marked 2.

  Reference numeral 5 denotes a V-shaped groove formed on a transparent film-like acrylic resin, plastic, or glass-like substrate. 5 is in the form of a thin film of several millimeters or less and is bonded to the substrate 2.

  FIG. 2 is a plan view of the planar light source unit. 21 is a planar light source unit main body, 5 is a film-shaped material constituting the planar light source unit, and 4 is a V-shaped groove. Reference numerals 22 and 23 denote light sources such as light emitting diodes (LEDs), fluorescent lamps, and cold cathode tubes.

  The V-shaped groove 4 is configured such that the density of the V-shaped groove increases as it approaches the center of the planar light source unit 21. The V-shaped groove has an effect of efficiently and uniformly guiding light from the light sources 22 and 23 as the end surface is rougher and the density is increased toward the center.

  In FIG. 2, a and b indicate that the configuration density of the V-shaped groove increases as it goes from the end face to the center as indicated by the arrow direction. The emitted light from the light source diverges uniformly and strongly from the 21 planar light source units.

  FIG. 3 shows a cross section of the planar light source unit main body 1. Reference numeral 31 denotes a reflector, and 32 denotes silk dot printing, which efficiently reflects light leaking from the V-shaped groove to illuminate a display such as a liquid crystal. Reference numerals 2, 3, and 4 denote film-like V-shaped grooves according to the present invention shown in FIG.

  Reference numeral 33 denotes a light diffusion lens film that diffuses light without unevenness. Reference numeral 34 denotes a film lens that collects light. The thickness of the planar light source unit is within a few millimeters.

  FIG. 4 shows a light reflection schematic diagram for reflecting the light in the planar light source unit to diverge it efficiently on the display. Reference numeral 41 denotes a path of light indicating reflection emitted from the light source. 41 light reflects the end face of the V-shaped groove or creates an optical path while reflecting inside the V-shaped groove and efficiently irradiates a display such as a liquid crystal through the 33 diffusion lens and the 34 condensing lens. .

  The light leaking from the V-shaped groove is efficiently reflected by 31 reflectors and 32 silk dot prints and led to the display. The optical path of the V-shaped groove is repeatedly reflected and transmitted through the lenses 33 and 34. The light leaked to the outside is reflected on the end face of the V-shaped groove and is similarly transmitted through 33 and 34 to irradiate the display.

Second embodiment

  5 to 8 show a second embodiment. FIG. 5 shows a manufacturing process and apparatus for increasing the mass production effect of the planar light source unit according to the present invention. Reference numeral 51 denotes a roll acrylic resin plate (transparent member) in which an acrylic resin plate is formed into a film of several millimeters. Reference numeral 52 denotes a roller having a projection like a gear for marking a V-shaped groove.

  Reference numeral 53 denotes a roll-shaped acrylic resin substrate, which is bonded to an acrylic film engraved with the film-like V-shaped groove 51 to complete the V-shaped groove portion of the planar light source unit shown in FIG. Reference numeral 59 denotes an adhesive spray nozzle on 51, which is uniformly applied to 51 film-like acrylic plates. Reference numeral 60 denotes an adhesive applied in a spray form on 51. 51 is bonded to 53 acrylic resin substrates to form 61 V-shaped groove forming parts. These manufacturing processes are performed consistently.

  58 is a heater which is heated and softened so that a V-shaped groove can be easily engraved in 51. The V-shaped groove is marked by 52 V-shaped protrusion rollers. The V-shaped protrusion roller 52 is provided with a halogen heater 54 in the V-shaped protrusion roller so as to be easily engraved, and the 52 roller is heated.

  As long as 58 heaters can be sufficiently engraved, 54 bar-shaped halogen heaters are not necessary. For heating, the adhesive can be applied to the acrylic substrate 53 by using an adhesive spray nozzle 59 to increase the adhesion effect.

  61 is completed by adhering an acrylic substrate and a film-like V-shaped groove part, and is conveyed in the X direction. Reference numeral 55 denotes a cutter device that cuts the V-shaped groove portion into an appropriate size. 56 is an upper blade and 57 is a lower blade. It operates in the Y and Y 'directions to cut 61 into a predetermined size.

Third embodiment

  FIG. 6 is a diagram relating to a manufacturing process and a method for bonding the V-shaped groove portion more firmly. 51 is a film-like acrylic resin, and 52 is a roller with protrusions for marking V-shaped grooves. 54 conveys 51, heating 51 film-like acrylic resin so that it may be easy to engrave with a heater.

  Reference numeral 62 denotes a roller that is pressure-bonded so that the V-shaped groove can be easily engraved. Like the roller 52, a roller-shaped halogen heater is provided at the center so that it can be easily engraved and can be easily adhered in a subsequent process. .

  59 is an adhesive discharge nozzle, and 60 is an adhesive liquid. 51 is uniformly applied on the surface. 53 is joined to a film-like acrylic resin (transparent member) coated with an adhesive with a roll-like acrylic substrate (transparent member). A roller 62 is a transport roller for more firmly pressing the V-shaped groove 51 and the 51. In order to increase the bonding effect, a bar-shaped heater may be provided at the center of the roller and heat-bonded.

  In the example of FIG. 6, since the surface engraved with the V-shaped groove is crimped by the transport roller 62, the crimping force may damage the shape of the V-shaped groove. In such a case, if 52 is placed on the transport section and 62 is placed on the lower side, and 62 rollers are placed on the upper side and 53 roll-shaped substrates are placed on the lower side, even if more pressure is applied to the 62 rollers, V-shaped 61 V-shaped groove portions can be formed without damaging the groove.

  55 is a cutting device 61, and 56 is an upper blade, 57 blades, and a lower blade which are operated from above and below to cut to a predetermined size.

Fourth embodiment

  7 to 8 show a fourth embodiment. In FIG. 7, reference numeral 52 denotes a gear-like roller provided with a protruding portion for marking a V-shaped groove. Reference numeral 71 denotes a protruding portion for marking a V-shaped groove, and rad indicates rotation. φ indicates the diameter of the roller, and the size may be changed according to the use of the V-shaped groove portion.

  FIG. 8 shows the formed V-shaped groove part. Reference numeral 61 denotes a V-shaped groove portion formed by bonding a V-shaped groove stamped on a film-like acrylic resin to an acrylic substrate. 4 indicates a V-shaped groove. In order to irradiate the display with light emitted from the light source uniformly and efficiently, the V-shaped groove at the end is rough and is engraved with a higher density toward the center.

  The density of the V-shaped groove can be realized by changing the conveyance speed 61 and the speed ratio of the marking roller 52 in FIGS.

  The V-shaped groove of the present invention may be a concavo-convex shaped object that effectively reflects light, an elliptical dot, or a scratch. As long as the acrylic resin is a transparent material such as a glass substrate, the present invention can be realized.

It is the figure which showed the cross section of the planar light source unit V-shaped part of 1st Embodiment. It is the figure which showed the plane of the planar light source unit. It is the figure which showed the structure of the planar light source unit cross section similarly. It is the figure which showed the model of the optical path in a planar light source unit. It is the figure which showed the planar light source unit manufacturing process of 2nd Embodiment. It is the figure which showed the planar light source unit manufacturing process of 3rd Embodiment. It is a figure which shows the structure of the V-shaped groove marking roller of 4th Embodiment. It is a figure which shows a V-shaped groove | channel structure site | part similarly.

Explanation of symbols

1, 61 V-shaped groove, scratch groove constituting part 2 Transparent material substrate 3 Adhesive surface 4, 71 V-shaped groove, scratch groove 5 Film-like transparent material 21 Planar light source unit 22, 23 Light source 31 Reflector 32 Silk dot printing 33 Diffusion Plate lens film 34 Lens film 41 Reflected light 51 Transparent material film roll plate 52 V-shaped groove, scratch engraving roller 53 Transparent material roll substrate 54 Bar heater 55 Cutter device 56 Upper cutting cutter 57 Lower cutting cutter 58 Film material heating Heater 59 Adhesive discharge nozzle 60 Adhesives 62 and 63 Crimp conveyance roller

Claims (4)

A method for constructing a planar light source unit for a backlight of a display such as a liquid crystal, and means for imprinting a V-shaped groove, scratch scratch 4 engraved with a projection of a transparent material 51 of a rolled film,
A method of constructing a planar light source unit, comprising forming a planar light source unit portion 61 by adhering a transparent film substrate layer to a 53-film V-shaped groove formed into a roll. In Claim 1, the means for forming the adhesive layer 3 by forming the film-like transparent material 51 into a roll and discharging the adhesive by the nozzle 59 provided during the transporting process of 51,
A method of constructing a planar light source unit, wherein a base layer 53 composed of a roll-shaped transparent material is bonded to the adhesive layer 3 to form 61. The method of constructing a planar light source unit, wherein the V-shaped grooves and scratches 4 are configured by providing protrusions on a roller that conveys the planar light source unit portion 61. The method for constructing a planar light source unit, wherein the V-shaped groove constituting part 61 is provided with means for manufacturing in an integrated process.

Images