JP2005285724A - Construction method of planar light emitting body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a configuration and a construction method of cross-sectionally V-shape optical path grooves for realizing a uniform light emitting body having high luminance and little irradiation unevenness. <P>SOLUTION: Cross-sectionally V-shape grooves 2 are formed on a substrate layer 1 using a transparent material and dot-pattern printing 3 is formed between the rows of V-shape grooves. The cross-sectionally V-shape grooves 2 are constructed with a certain spacing at the end surface near a light source. The V-shape grooves are engraved shallow at the portion near the light source and engraved deep at the center part, thus minimizing attenuation and lead the light, thereby a planar light emitting body having a high illuminance on the whole surface with uniform emission of light is realized. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

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

  A liquid crystal display (LCD) display is used for a liquid crystal TV, a PDA (Personal Digital Assistant), a mobile phone, and various display boards. In particular, with the spread of the Internet network, it is remarkably widespread as a display for television, information 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 emitters are used for backlights such as liquid crystal displays. Various features have been devised so far in order to cause surface emission uniformly with high brightness and illuminance. For example, an edge light type surface light emitter irradiates a liquid crystal display from behind using a surface light emitter as shown in FIG.

  As shown in the cross-sectional view of FIG. 2, the structure of the light-guiding plate 1 of the planar light-emitting body is 3 The dot-shaped dots are printed and configured. In recent years, many light emitters such as organic EL (Electro Luminescence), inorganic EL, FED (Field Emission Display), and SED (Surface Conduit Emitter Display) have been proposed as planar light emitters. Only small screens are practical.

Therefore, a light guide plate having a structure like a V-shaped cross section is practical for a large planar light emitter. The cross-sectional V-shaped groove conventionally requires a special machine tool or is formed by carving using a laser beam. However, it has been difficult to manufacture a high-quality planar light-emitting body with uniform characteristics due to poor mass productivity and high cost.
JP 2003-107216 A Japanese Patent Application No. 2002-377447 Japanese Patent Application No. 2003-205523 Nikkei Electronics "Realized with a single panel with a liquid crystal transparent planar light emitter" March 1, 2004 issue

  The problem to be solved is that in the conventional planar light emitter, the light from the light source placed on the end face of the light emitter is guided to the center of the surface without being attenuated, and the entire surface is uniformly irradiated.

  In order to solve the above-mentioned problems, the present invention takes a cross-sectional V-shaped groove of the light guide plate part from the end close to the light source with a constant gap, and keeps a constant interval without carving the cross-sectional V-shaped groove. Engrave from. In order to obtain uniform illuminance on the entire surface, dot-shaped (dot) pattern printing is performed between the V-shaped cross sections.

  The shape of the light guide groove of the planar light-emitting body includes a scratch-like groove, an elliptical dot-like groove, and a minute prism in addition to the V-shaped cross section. The present invention is ideal to irradiate the entire surface evenly with high illuminance without efficiently attenuating light from a light source provided on the end surface, which is a V-shaped groove that can be easily processed.

  The cross-sectional V-shaped groove shape (hereinafter referred to as a V-shaped groove) of the planar light-emitting body light guide portion of the present invention is configured so that the V-shaped groove pattern is formed at the light source end surface in order to emit light uniformly to the center of the surface without attenuation. A V-shaped groove is formed after a certain interval.

  This light guide cross-sectional V-shaped groove pattern configuration does not form a cross-sectional V-shaped groove at a constant distance in the vicinity of the light source end face. A V-shaped cross section is formed after a gap of a certain distance. Furthermore, dot-like printing (dot pattern) is provided between the cross-sectional V-shaped grooves on the substrate layer made of a transparent member. With such a configuration, although the central portion of the light emitting surface is separated from the light source, the light is effectively attenuated without light attenuation, and the entire surface emits light uniformly and with high illuminance.

  The present invention aims to guide light uniformly from the light source to the center of the surface while maintaining high illuminance without efficiently attenuating.

First embodiment

  FIG. 1 shows a first embodiment according to the present invention. In FIG. 1, reference numeral 1 denotes a substrate layer using a material such as a transparent acrylic resin of a light guide member forming a planar light emitter. Two V-shaped grooves are carved on the substrate layer. Reference numeral 3 denotes a dot pattern formed between the V-shaped grooves, which has an effect of uniformly diffusing and emitting the entire surface with high illuminance.

  In FIG. 1, a, a ′ and b, b ′ form two V-shaped grooves after a certain distance a, b from the end face of the substrate layer 1. This has the effect of keeping the entire surface uniformly high illuminance.

  FIG. 2 shows a cross section of FIG. A cross-sectional V-shaped groove 2 is formed on a substrate layer formed of one transparent material, and a dot pattern 3 is provided on the interval. The V-shaped groove 2 forms a cross-sectional V-shaped groove having two cross sections after a certain distance from the end face of one as shown by a and a '. Similarly, the horizontal end face 1 is formed with a V-shaped light guide groove formed at a distance of b and b 'from the cross-sectional V-shaped groove as shown in FIG.

  FIG. 3 shows a cross-sectional configuration diagram of the planar light emitter. Reference numeral 31 denotes a planar light-emitting body, 32 is a reflecting plate for leaking light, and 33 is reflective silk dot printing. 1 is the substrate layer, 2 is a V-shaped cross section, and 3 is a dot pattern for uniformly diffusing light while maintaining high illuminance. Reference numeral 34 denotes a film-like diffusion lens, and 35 denotes a film condensing lens. “a” and “a ′” indicate that the V-shaped groove 2 is formed after a certain distance from the end face of 31.

  The depth of the V-shaped groove 2 is all shown in FIG. 3, but the V-shaped groove starting from the end face a is initially shallow, and if the structure becomes deeper toward the center, the center In addition, the light from the light source effectively reaches even more without attenuation.

  The depth of the cross-sectional V-shaped groove is usually about 100 μm to 200 μm. For example, a cross-sectional V-shaped groove starting from a certain distance a from the end face is initially carved shallowly at 50 μ and gradually deepened so that it becomes deeper toward the center and becomes about 200 μ. By doing so, the light emission of the entire surface can be kept at a uniform illuminance.

  FIG. 4 shows a characteristic curve. The vertical axis I represents the illuminance of light, and the horizontal axis L represents the distance from the end face of the planar light emitter 31. The dotted characteristic curve is a planar light emitter of the conventional example, and the illuminance of the light at the center is lowered. In the present invention, as indicated by a solid line, the illuminance is constant from the end of the surface to the center.

  FIG. 5 shows the plane of the planar light emitter. 51 is a planar light-emitting body, and 2 is a V-shaped light guide groove. In this example, a straight cross-sectional V-shaped groove is shown. Reference numerals 51 and 52 denote light sources composed of light emitting diodes (LEDs), EL (Electro Luminescence), fluorescent lamps, cold cathode tubes, and the like.

  The cross-sectional V-shaped groove 2 has a V-shaped groove carved after taking a certain gap from the end face of the planar light-emitting body 1. A dot pattern such as 3 is printed between the V-shaped grooves. As the distance from the light source increases and the distance from the light source approaches the center, normal light attenuates. With such a configuration, the light can be uniformly irradiated to the center of the surface without attenuation without being attenuated. Therefore, the cross-sectional V-shaped groove does not start immediately from the end face, but guides light to the cross-sectional V-shaped groove after a certain gap, and the light emitted from the light sources 51 and 52 is efficiently obtained by the dot pattern effect. Uniform surface emission.

Second embodiment

  6 to 9 show a second embodiment. FIG. 6 is a configuration diagram for effectively and uniformly emitting light over the entire surface by a pattern pattern of a V-shaped cross section of a light guide plate body. FIG. 6 shows a pattern in which the cross-sectional V-shaped grooves 61, 62, 63, 64 on the light guide plate 1 radiate from the center of the surface so as to converge to the center of the surface.

  61 is from the left to the center of the sheet, 62 is from the right to the center of the sheet, similarly, 63 is from the surface, and 64 is from the bottom to the center. . By constructing such a cross-sectional V-groove pattern, the entire surface emits light with uniform high illuminance.

  FIG. 7 shows a cross-sectional V-groove pattern for further efficiently reflecting light inside the cross-sectional V-shaped groove in order to reflect light within the planar light emitting body and efficiently diffuse it to the display. In FIG. 7, the cross-sectional V-groove pattern is elliptical.

  In FIG. 7, 1 is a light guide plate body, 71 is an elliptical cross-section V-shaped groove pattern from the lower surface, and 72 is an elliptical pattern of the upper surface. By configuring the cross-sectional V-shaped groove in this way, uniform and high illuminance is obtained for the entire surface emission.

  FIG. 8 shows an example in which a straight cross-sectional V-shaped groove, a circular or elliptical cross-sectional V-shaped groove pattern, and a linear cross-sectional V-shaped groove are formed in order to obtain high illuminance and uniformity of surface light emission. Reference numeral 1 denotes a light guide plate body, 81 denotes a circular or elliptical V-shaped groove, and 82 denotes a linear cross-sectional V-shaped groove. In order to increase the brighter planar light emission efficiency, the density may be increased at the center with 81 and 82, and the cross-sectional V-shaped groove pattern having a coarser density toward the end of 1 may be formed.

  FIG. 9 is for the same purpose as described above, and is to provide an effect by using a straight line and a meandering pattern in combination in the configuration pattern of the V-shaped cross section. In the figure, 1 is a light guide plate body, 91 is a meandering cross-section V-shaped groove, and 92 is a straight cross-section V-shaped groove. With such a configuration, there is an effect of increasing the illuminance of the entire surface and irradiating uniformly.

  6 to 9 of the second embodiment have the effect of uniformly diffusing light illuminance when a dot pattern is printed between V-shaped grooves in the same manner as described above.

It is the figure which showed the light-guide plate plane of the planar light-emitting body of 1st Embodiment. It is the figure which showed the light-guide plate cross section of a planar light-emitting body similarly. It is the figure which showed the cross-sectional structure of the planar light-emitting body similarly. It is the figure which showed the illumination intensity distribution characteristic curve of the planar light-emitting body similarly. It is the figure which showed the plane of the planar light-emitting body similarly. It is the figure which showed the pattern of the radial cross-section V-shaped groove | channel of 2nd Embodiment. It is the figure which showed the pattern of the elliptical cross-section V-shaped groove | channel. It is the block diagram which combined the pattern of the elliptical, circular shaped cross-section V-shaped groove | channel, and the linear cross-section V-shaped groove | channel. It is the block diagram which combined the pattern of the meandering cross-sectional V-shaped groove | channel and the linear cross-sectional V-shaped groove | channel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light guide plate body 2 Cross-section V-shaped groove 3 Dot pattern printing 31 Planar light-emitting body 32 Reflective printing board 33 Reflective silk dot printing 34 Diffusion plate lens film 35 Condensing lens film 51, 52 Light sources 62, 63, 64, 65 Radial cross section V-shaped groove pattern 71, 72 Elliptical cross-sectional V-shaped groove pattern 81 Ellipse, circular cross-sectional V-shaped groove pattern 82, 92 Linear cross-sectional V-shaped groove 91 Serpentine cross-sectional V-shaped groove pattern

Claims (6)

A method for configuring a display backlight such as a liquid crystal,
Means comprising a V-shaped cross section 2 on a substrate layer 1 formed of a transparent material, the V-shaped cross section having a predetermined distance from the end face of 1 to form a V-shaped groove;
A planar light-emitting body comprising dot-like printing for the purpose of diffusing light and irradiating the light-emitting surface evenly at intervals on the base layer in which the formed V-shaped grooves are arranged Configuration method. A method for efficiently and evenly irradiating the light emitting surface of a planar light emitter,
A method of constructing a planar light emitter, wherein the cross-sectional V-shaped groove is gradually deeply engraved from the end face close to one light source toward the center and led to the center without being attenuated. 2. The method of constructing a planar light emitter according to claim 1, wherein the pattern of the cross-sectional V-shaped groove includes radial shapes 61, 62, 63, 64 converging at the center portion and a dot-like print pattern. 2. A method of constructing a planar light emitter according to claim 1, wherein the V-groove patterns 71 and 72 are elliptical. 2. The method of constructing a planar light emitter according to claim 1, wherein the pattern of the V-shaped cross section is a combination of a circular, elliptical shape 81 and a straight line 82. 2. The method of constructing a planar light emitter according to claim 1, wherein the pattern of the V-shaped cross section is a combination of a meandering shape 91 and a straight line 92.

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