TWI253528B - Luminous device - Google Patents

Abstract

The present invention provides a novel luminous device to eliminate the disadvantage of nonuniform brightness resulted from the shadow of tube, etc, so as to enhance the luminous quality. The luminous device to achieve the effect is a luminous device to stack diffusing sheets on the planar luminous section. The diffusing sheet has a diffusing layer on one surface of its substrate, and the other surface of the diffusing sheet is the non-diffusing surface. The diffusing sheet is formed by allocating the diffusing layer toward the said luminous section.

Description

1253528 V. INSTRUCTION DESCRIPTION (1) "'" —- I. Technical Field of the Invention The present invention relates to a backlight charging device for a liquid crystal display device. 2. [Prior Art] In the conventional backlight device for a liquid crystal display device, in addition to a so-called side-light type backlight in which a light source is disposed on a side surface of the light guide plate, a so-called down-type type in which a light source is disposed on the back surface of the diffusion plate or Straight light type

What kind of backlight device is used for a linear light source such as a cold cathode tube or a source of lED m as a light source and is guided by a light guide plate or a diffusion plate; First or expansion of thin sheets and sheets. ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, The situation produces a comprehensive illumination ^ i will appear on the expansion board with the shadow of the tube and the unevenness of the earth. Change the ancient * and the light source: the distance is opposite to the position of the cold cathode tube, because the position between the diffusion plate is dimmer, so that the brightness of the whole surface diffusion plate is not the same as the negative light, there is light in the diffusion plate Light on the top of the section to make the diffusion board or the slab of the sub-wood 4

Page 5 1253528 V. Invention description sheet, but good is very good for this (1) addition (2) in the expansion oil (3) will be the lamp, but the south is also for some reason, the amount of light is reduced to use ink after the expansion Improve the light color of the lamp printing ink. After the use of the solid can be changed, resulting in a reduction of > '氐 The present is providing improved illumination (2) In fact, such optical sheeting device, the above-mentioned lamp shade changes. In the past, the countermeasures for the shadow of the lamp were as follows: The light curtain made the brightness on the tube dim. The bottom surface of the sheet (ie, the side of the tube side) is printed with a layer of white diffused ink. The distance between the tube and the diffuser sheet is pulled apart. When adopting the method of (1), it is necessary to add a light curtain and the cost of the light curtain screen is to shield the light source to obtain a uniform light-emitting state, and the backlight is affected by the shadow, and the backlight is darker in the same power. . In the method of (2), printing the diffusing oil-dispersible ink layer on the inside of the diffuser plate will simultaneously shield and diffuse the light. Although the effect of the tube shadow is provided, the coating is excessively increased in order to greatly improve the shadow of the tube. When printing too thick, the shaded part becomes yellowish. Although the brightness is uniform, both of which bring about the uneven effect of the color of light (3), the distance between the tube and the diffuser sheet is pulled open. The quality of the light is increased, but the thickness of the product is also increased by the distance between the tube and the diffuser plate, and the amount of light emitted from the backlight is also changed, in other words, it becomes a thick and dark backlight. In view of the fact that the current situation has been improved through research, the main objective is to improve the unevenness of illumination such as the shadow of the lamp, and to replace the novel technology of the above methods (1) to (3).

1253528 V. INSTRUCTIONS INSTRUCTIONS The third method is to use the diffuser plate to align the diffuser layer with the liquid crystal. Relative (as in the case of the straight y configuration, the situation of the reverse is improved. In this case, the single sheet is constructed with a single surface, and the backlight can be improved in one step. (3) The light device 'has The diffuser is disposed on the surface of the diffuser or the light source holder of the light guide is disposed on the planar light-emitting portion of the light source; wherein the diffuser is formed by a substrate (a diffusion layer formed on one side of the substrate) The diffuser is formed on the other side of the sheet, and the diffusion sheet is formed to face the diffusion layer. The diffusion sheet is formed by forming a diffusion layer on one surface of the substrate, and is exposed to light (for example, liquid crystal). "Display device backlight device board" is configured" (hereinafter, this type of arrangement is referred to as "surface alignment". The diffusion layer of the diffusion sheet faces the light-emitting portion and is light->1. Board) configuration, (hereinafter referred to as "inward direction"). The inventors found in the experiment that the expansion and arrangement, that is, facing the morning surface and comparing with the surface of the same diffusion sheet, can improve the diffusibility of light. Will send The light and dark are staggered, and the illuminating quality can be improved, and the present invention can be completed. 'The diffusion sheet can be used only one piece, and it is suitable for reducing the cost. However, it is also possible to use a diffusion sheet as needed. The optical sheet (such as enamel sheet, polarizing sheet, etc.) can only simplify the structure and reduce the cost by using the diffuser on the inner side. When the wood is used with a plurality of diffusing sheets arranged in the middle, the illuminating quality is improved. Into 1253528 V. Inventive Description In addition, the other light of the multi-layer sheet or the board package is arranged to face the light quality, and the optical sheet is placed to improve the long-term arrangement of the so-called sheet and sheet, and then generated from the majority of the board on the side. The feature is that (4) from the perspective of the other part of the optical thin film containing the one-sided slice, the surface of the film can be compared, and at the same time, the low brightness of the brightness is equivalent to the other kind of optical or partial diffusion. Another point of view, the illuminating of the film is made up of a diffusion layer of other kinds of plates, which are arranged in the hair to effectively improve the hair directional configuration, thereby optically reducing the light. In the case where the sheet is produced by using light of a thin sheet, the light emitted by the source is invented by the light-diffusing sheet of the source, and the thin portion of the diffusing sheet of the light and the same light is thinned into a flat surface. The invention is characterized in that the diffusing sheet and the diffusing sheet are not overlapped with the diffusing sheet surface of the other sheet, and the optical thinning is the same as that between the diffusing sheet and the diffusing layer. The surface is unevenly distributed to further improve the hair piece arrangement. The light is recovered by controlling, for example, a piece of light, and the light source and the other are made by a polarizing light source. The film has a non-diffusion surface formed on the base side of the substrate. When the light is placed on the back surface of the diffusing plate on the surface of the diffusing plate, the back surface is disposed on the back surface of the diffusing plate, and the thin plate or the like is preferably thin, and the thin plate is preferable. For the effect of light collection or polarization. There is a light-emitting device which is disposed on the back surface (inside: diffused diffusion plate 5 and diffused into the shadow of the lamp tube, and a diffusion sheet is disposed on the surface, and the diffusion layer formed by the diffusion and the other diffusion film on the substrate are The diffuser layer faces the light source surface side of the so-called direct light type, and the light source is shaded by the light source, but is arranged by the same diffusion sheet.

Page 8 1253528 V. Description of the invention (5) The shape comparison can effectively improve the lightening of the shadow of the lamp and improve the quality of the illuminating. Further, on the non-diffusion surface side of the diffusion sheet, it is preferable to further provide a light-collecting sheet for collecting the astigmatism transmitted through the diffusion sheet, whereby the light-collecting sheet can improve the diffusion sheet disposed in the inner direction. The degree of brightness is reduced, so that the illumination quality and brightness can be simultaneously improved. Further, the diffusion sheet may be a single sheet or a plurality of sheets, and the collecting sheet may be a sheet or a collecting type diffusion sheet. [Embodiment] Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. In the present embodiment, a direct-light type backlight device having a light below is described as an example of a light-emitting device of the present invention. The first diagram and the second diagram show the direct-light type backlight device 1 of the first embodiment, which is composed of a light source 2, a light source holder 3 that holds the light source 2, a diffusion plate 4 that is mounted on the light source holder 3, and is placed. The diffusion sheet 5 is formed on the surface of the diffusion plate 4. The planar light-emitting portion 10 is usually constituted by the light source 2, the light source holder 3, and the diffusion plate 4. The light source 2 is a linear light source, specifically, a cold cathode tube type fluorescent lamp having a diameter of about 3 mm. The light source 2 is arranged in a plurality of parallel directions, and is only three in the drawing. However, if the direct light type backlight device is a backlight device for a large liquid crystal display device of more than 15 inches, the light source 2 is preferably eight or more. As shown in the second figure, the light source holder 3 constitutes a box type frame of a direct light type backlight device, and one surface (upper surface of the drawing) is opened. This box light source is guaranteed

Page 9 1253528 V. DESCRIPTION OF THE INVENTION (6) The inner surface (bottom surface and side surface) of the holder 3 is provided with a light reflecting layer 3a, and the light emitted from the light source 2 is reflected by the light reflecting layer 3a to the diffusing plate 4. Both ends of the light source 2 in the longitudinal direction are supported by the light source holder 3, and the plurality of light sources 2 are disposed in parallel at a predetermined interval in the direction perpendicular to the longitudinal direction. If a brighter brightness is required, the number of light sources 2 arranged in parallel can be increased, and the adjustment of the brightness can be easily achieved by increasing or decreasing the number of the light sources 2. Further, an inverter for lighting the light source 2 can be used, and the inverter (not shown) is generally mounted on the bottom surface 3b of the light source holder 3. The diffusing plate 4 is made of white glass, acrylic glass or polycarbonate plate and has a function of diffusing light from the light source 2. The use case of the diffusion plate 4 can be, for example, a PC 1 3 1 1 (50) product manufactured by Teijin Corporation. The diffuser plate 4 is fixed to the upper surface of the light source holder 3 in an opening shape covering the light source holder 3, and the light source 2 is formed on the back side of the diffuser plate 4 (below the first figure). The diffusing plate 4 forms a planar light-emitting portion. However, the light-emitting portion (diffusion plate) 4 usually produces a light-shading phenomenon in which the plurality of light sources 2 are brighter above the light source but the light source 2 is darker. The arrangement of the diffusion sheet 5 eliminates the shadow of the tube and enables the illumination 4 to obtain a relatively uniform illumination surface. As shown in the enlarged cross-sectional view of the third drawing, the diffusion sheet 5 has a substrate 5 i which is a sheet-like substrate such as a transparent polyester resin, a light diffusion layer 52 formed on one surface of the substrate 51, and a base layer formed thereon. The other surface of the sheet 51 is composed of a non-diffusion surface 53. The diffusion layer 52 is formed by applying a synthetic resin coating containing microparticles capable of diffusing light to one surface of the substrate 51. Further, the non-diffusion surface 53 of the other surface of the substrate 51 is formed by applying or imprinting a back surface layer for preventing dust and v-use anti-adhesion coating. Such a diffusion sheet 5 can be taken

Page 10 1253528 V. INSTRUCTIONS (7) Use, for example, the Obes B S - 0 1 (trade name) produced by Japan Huihe Company. The diffusion sheet 5 thus constituted also has a light collecting property (a property in which light is concentrated in the front direction of the diffusion sheet, that is, a direction perpendicular to the diffusion sheet to increase the brightness of the front surface), and is generally referred to as a collecting type diffusion sheet. Further, the diffusion sheet may be a protective diffusion sheet for being laminated on a cymbal sheet or the like to protect the cymbal sheet. Conventionally, the diffusion sheet 5 has the surface of the diffusion layer 52 facing the liquid crystal display panel with the light energy emitted from the light source being irradiated onto the non-diffusion surface 55, and the diffusion plate facing the diffusion surface (the back surface) 5 3 4 The configuration that combines the surface energies of the two (ie, the surface orientation) is a common knowledge in the industry, and the surface distribution is used to spread and collect light, and has never changed. However, the surface-distributed diffuser, although it can diffuse some degree of light, is still insufficient to eliminate the shadow of the lamp. On the other hand, the present invention is an anti-conventional surface orientation in which the surface (surface) of the diffusion layer 52 faces the diffusion plate 4 of the light-emitting portion 10, and the non-diffusion surface (inside) 53 faces the liquid crystal display panel. The arrangement in which the diffusion layer 52 is attached to the diffusion plate 4 of the light-emitting portion 10 is disposed (in the rear direction). According to the experimental results, it has been found that when the diffusion sheet 5 is disposed in the direction of the surface, the diffusion sheet is improved in the surface direction when the diffusion sheet 5 is disposed in the front direction, and the light-emitting surface is removed to obtain a light-emitting surface having uniform brightness. Moreover, when the diffusion sheet 5 is arranged in the direction of the direction, it is inevitable that the brightness is lower than that in the case of the front side arrangement. For the direct light type backlight, it is very easy to increase the number of the light sources 2 in the structure, so that the number of the light sources 2 is increased. In order to compensate for the low brightness caused by the arrangement in the diffusion sheet 5, the brightness equivalent to that in the surface orientation configuration can be obtained, and the brightness is better than that in the surface orientation configuration.

Page 11 1253528 V. Description of invention (8) Light quality. Table 1 below shows the diffusion sheet 5 in the reverse direction in the direct-light type backlight device shown in the first figure, and visually compares the light-emitting quality produced by the diffusion sheet having different haze values (haze). The degree of improvement in the shadow of the lamp). In Table 1, X represents a small improvement in luminescence quality, △ represents a moderate improvement in luminescence quality, ◦ represents a better improvement in luminescence quality, and ◎ represents a better indicator of improvement in luminescence quality. [Table 1] Turbidity value 31% 4 9% 6 4% 7 5% 8 0% 9 0% Luminous quality X Δ 〇 ◎ ◎ ◎ According to the results of Table 1, it is understood that the turbidity of the diffusion sheet 5 is not known. Although the improvement of the luminescent quality is obtained, the illuminating quality is preferably at a turbidity value of 60% or more, and particularly, in the case of 7.55% or more, the effect of improving the shadow of the lamp is particularly good. According to the embodiment, it is possible to eliminate the conventionally ensuring good illuminating quality and sufficient brightness, and (1) adding a light curtain, (2) applying a diffusing ink on the back side of the diffusing plate, and (3) making the tube Measures such as the distance between the diffusion plate and the diffusion plate. In particular, since the distance between the tube and the diffusion plate is not required to be pulled, the thickness of the device can be lowered to a relatively low level while maintaining the desired illumination quality. In particular, it is not necessary to provide a light curtain, and it is not necessary to print a diffusing ink, thereby reducing the cost. Therefore, the direct-light type backlight device according to the present invention is most suitable for 1253528. 5. Description of the invention (9) A liquid crystal display device requiring low cost, high quality, and thinness. The fourth embodiment shows a second embodiment of the present invention. In the direct-light type backlight device 1 of the second embodiment, the diffusion sheet 5 is not used as in the first embodiment, but is used in the diffusion arrangement of the inner surface. The pieces are overlapped and configured. Specifically, two sheets of the diffusion sheet 5 disposed in the middle direction are used in this embodiment. By increasing the number of diffusers 5 disposed in the inner direction, the occurrence of lamp shadows can be further improved, and the light quality can be improved. Further, when the number of the diffusion sheets 5 disposed in the inner direction is increased, it is inevitable that the brightness is slightly reduced, but the shadow of the tube is eliminated, so that the number of the diffusion sheets 5 to be disposed in the middle is preferably three or less. The fifth embodiment shows a third embodiment of the present invention. In the direct-light type backlight device of the third embodiment, the upper surface (i.e., the non-diffusion surface) of the diffusion sheet 5 disposed in the opposite direction is further laminated with other optical sheets (abbreviation). He is a plate, here is the polarizing sheet 6. That is, the diffusion sheet 5 disposed inside is disposed between the diffusion plate 4 and the polarizing sheets 6 of the other sheets. By arranging the diffusion sheet 5 and the polarizing film 6 disposed in the inner direction, the diffusion sheet 5 disposed in the inner direction can be used to improve the light-emitting quality, and the polarization light can be used to change the angle of the control light. Further, the number of the diffusion sheets 5 disposed between the diffusion plate 4 and the polarizing sheet 6 may be a single piece or a plurality of pieces. Moreover, the plate 6 can be used in a single piece or a plurality of pieces, and a multi-piece configuration of a different type of plate can be used. In this embodiment, the polarizing sheet 6 can be used as DBEF-D (produced by Sumitomo 3M, Japan). The product name is a polarizing sheet, and the diffusion sheet 5 is a 188GM2 (trade name) diffusion sheet produced by KIMOTO Co., Ltd., and the diffusion plate 4 can be manufactured by Teijin Co., Ltd. PC - 1 3 1 1 (50) (trade name). Figure 6 shows a fourth embodiment of the present invention, the direct light type of this embodiment

Page 13 1253528 V. DESCRIPTION OF THE INVENTION (10) The backlight device 1 employs a thin sheet 7 of an optical sheet which has a plurality of fine crotch portions (polygonal lens portions) to generate light collecting properties. Since the combination of the diffusion sheet 5 and the cymbal sheet 7 disposed in the inner direction is provided, the shadow of the tube can be removed by the diffusion sheet 5 disposed in the inner direction to improve the illuminating quality, and the prism refraction effect generated by the sheet is restored to restore the original Reduce the brightness. Further, a second diffusion sheet 8 for protecting the upper surface of the prism sheet 7 may be disposed in the front direction. Further, the protective diffusion sheet 8 used herein may be selected from Wells 100-BMU4S (trade name) produced by Japan Huihe Co., Ltd., and BEF II 1-7 (trade name) produced by Sumitomo 3M Co., Ltd., diffusion plate. A person who can be produced by Mitsubishi Shining Co., Ltd. (^乂146]\[〇.430 (trade name). The seventh figure shows a fifth embodiment of the present invention, and in the direct-light type backlight device 1 of the present embodiment, the inner direction is arranged. The top of the diffusion sheet (ie, the first diffusion sheet) 5 is not stacked with other kinds of optical sheets, but is disposed with a diffusion sheet that is disposed in the front direction as the second diffusion sheet 9. The second diffusion sheet 9 itself and the first diffusion sheet 5 The properties are the same except that the non-diffusion surface 53 is disposed facing the light source 2, and the diffusion layer 52 faces the liquid crystal display panel. The second diffusion sheet 9 is originally like the first diffusion sheet 5 and has both diffusibility and light collecting properties. The second diffusion sheet 9 has a function of concentrating the light transmitted through the first diffusion sheet 5 in a normal use state. In this embodiment, the diffusion sheet 5 and the table are disposed in the reverse direction. The diffusion sheet 9 is simultaneously disposed, so that the diffusion sheet 5 disposed in the inner direction can be raised. External light quality, but also by the diffusion sheet disposed Table 9 sets of light, but will result in a low brightness caused by the reduction of the diffusion sheet 5 disposed Zaiyu reply improved.

Page 14 1253528 V. INSTRUCTION DESCRIPTION (11) The first diffusion sheet 5 and the second diffusion sheet 9 may be D 1 2 6 (trade name) manufactured by TSUJ IDEN (Electric) Co., Ltd. Further, the haze value (turbidity) of the first diffusion sheet 5 and the second diffusion sheet 9 may be the same as or different from the characteristics of the application diffusion sheet. Further, the portions omitted in the description of the second to fifth embodiments are substantially the same as those of the first embodiment. The present invention is not limited to the above embodiments, and it is obvious that various modifications and modifications can be made. Further, the light-emitting device or the backlight device of the present invention is not limited to use in a liquid crystal display device, and can be used for, for example, a light box for viewing negative photos of a photograph, a lighting billboard, a signboard, a photo box for observing an X-ray photograph, and the like. . Further, the light-emitting portion may be a side-light type backlight device in which a light source is disposed on the side surface of the light guide plate, and will be described together. [Effects of the Invention] According to the present invention, it is only necessary to use a configuration in which a diffusion sheet having a diffusion layer is disposed in the inner direction, thereby simply eliminating the shadow of the tube and improving the illuminating quality.

Page 15 1253528 BRIEF DESCRIPTION OF THE DRAWINGS The first figure is a schematic cross-sectional view of a light-emitting device according to a first embodiment of the present invention. The second figure is a perspective view of the light source holder and the light source of the first embodiment of the present invention. The third figure is an enlarged cross-sectional view of the diffusion sheet of the light-emitting device. Figure 4 is a schematic cross-sectional view showing a light-emitting device according to a second embodiment of the present invention. Figure 5 is a schematic cross-sectional view showing a light-emitting device according to a third embodiment of the present invention. Figure 6 is a schematic cross-sectional view showing a light-emitting device according to a fourth embodiment of the present invention. Figure 7 is a schematic cross-sectional view showing a light-emitting device according to a fifth embodiment of the present invention. DESCRIPTION OF REFERENCE NUMERALS 1 direct light type backlight device (light-emitting device) 2 light source 3 light source holder 3a light reflection layer 3 b bottom surface 4 diffusion plate 5 diffusion sheet (first diffusion sheet) 51 substrate (substrate) 52 diffusion layer 53 Diffusion surface

Page 16 1253528 Simple description of the figure 6 Polarized sheet (other kind of sheet) 7 稜鏡 sheet (other kind of sheet, light collecting sheet) 8, 9 Second diffusing sheet (light collecting sheet) 10 Light emitting part (including 2,3,4 )

Claims (1)

^53528 1 · ——~~~—_ Scope of application for patents • A kind of illuminating device consists of a light source to keep the yellow defrosting film to form the above-mentioned expansion layer' and form a scatter film system to expand • If the patent application is used~ Zhang ́s • && above the light-emitting part. • A light-emitting device # light source holds m optical sheet, the above-mentioned light sheet 'and non-diffusing sheet system, and the light-emitting portion and the upper patent application sheet are provided with a plurality of light sources and a plurality of light sources. 'There is a planar hair having a light source disposed on the back seat of the diffuser plate, wherein the political sheet is formed of a substrate, and the non-scattering layer on the other side of the substrate faces the light-emitting portion. The light-emitting device is the light-emitting device of the first item, and the diffuser is disposed in a portion, and has a surface-shaped hair having a light source disposed on a back seat of the diffuser; the feature sheet includes: diffusion on one side a sheet of other kind of optical sheet whose diffusion layer faces the above-mentioned illuminating surface between the optical sheets of the fourth embodiment of the illuminating device or has a polarizing plate having a diffusing plate for diffusing the plate. The light pipe shadow caused by the light; the surface of the plate is provided with a diffusion sheet $ or a side surface of the light guide plate, and the overlapping portion is arranged to expand the diffused surface of one side of the substrate, In this expanded set by the light emitting portion. Wherein the diffusion sheet is only disposed in the diffused layer in the same direction, or after the light-emitting portion is superimposed on the side surface of the light guide plate to form a diffusion sheet having a diffusion layer, and the state of the portion side is sandwiched between The 〇 'the one who is the one who is optically thin. The plurality of light diffusing plates on the back side are produced by a plurality of features: Page 18 1253528 \, the patented range sheet, the diffusion layer formed on one side of the substrate, and the non-diffusion surface formed on the other side of the substrate, and the diffusion sheet is the diffusion layer facing the light source . The light-emitting device of claim 6, wherein the non-diffusing surface of the diffusion sheet is provided with a light-collecting film capable of collecting light transmitted through the diffusion sheet. Page 19 1253528 'The annual force c (more) is replacing the page 1253528 //γ — fgn 弟二图 1253528 t·丨.· ^ 4 2 2 2 Fourth Figure 1253528 f f I 1 I 5 2 2 2 Fifth Figure 1^53528 Tiir —1— f〇l eighth picture 1253528 Seventh ffl