TW200912197A - Optical film, lighting device and display unit - Google Patents

Abstract

A display unit capable of reducing luminance irregularity when using a point light source is provided. The display unit includes: a panel driven based on an image signal; a plurality of point light sources arranged in a region facing the panel; and an optical sheet arranged between the panel and the plurality of point light sources. The plurality of point light sources are arranged in a first direction and also in a second direction intersecting with the first direction, and the optical sheet has a tridimensional configuration that includes a first ridgeline extending in a third direction intersecting with the first and second directions, and a second ridgeline extending in a direction intersecting with the first, second and third directions.

Description

200912197 IX. Description of the invention: [Technical field to which the invention pertains] * The present invention relates to an optical film having a three-dimensional configuration on its top surface, and an illumination device and a display element therewith. The present invention contains a Japanese patent application filed on July 24, 2007 in Japan, and a Japanese patent application filed in Japanese Patent Application No. 20-7-192m and a patent application filed on May 8, 2008 in the Japanese Patent Office. The subject matter of the above-identified application is hereby incorporated by reference. 〇 [Prior Art] LCD (liquid crystal display) has gradually replaced CRT (Cathode Ray Tube) because of its low power consumption, space saving, and low price. It has been the mainstream of display systems so far. The LCD is divided into several types according to the illumination method for displaying images. Representative examples include transmissive LCDs that use a backlight system for image display. Such display elements are preferably intended to extend their color gamut. For this purpose, it has been proposed to use three primary color LEDs (light emitting diodes) of blue, green and red as a light source instead of CCFL (Cold Cathode Fluorescent Lamp). In addition, not only the three primary color LEDs, but also the use of four primary colors or six primary color brushes to obtain a wider color gamut. To use CCFL and LED as the light source, uniformity of brightness and color in-plane distribution is necessary. In the case where the illumination device is relatively small, a light guide plate of the sidelight backlight system can be used. However, in the case where the illumination device is relatively large and requires a large amount of light, the direct type LCD backlight system, in which the light source is disposed on the direct back side portion of the panel and the like, is superior. One of the techniques for reducing the brightness irregularity and the color unevenness in the direct type is proposed to dispose the diffusing plate containing the filler in the position on the light source (refer to Unexamined Patent Application Publication No. 54-155244 ). As a further technique, it is proposed to provide a plate whose profile configuration is uniform in one direction. (Unexamined Patent Application Publication No. 2005-3268 No. 19). [Summary of the Invention]

In the case where the three primary color LEDs are used as the light source of the illumination device, it is difficult to reduce the in-plane luminance irregularity and the color unevenness as compared with the case of using the CCFL. The fact of this blame is that the Led is a point source and in the case of the three primary colors led white is produced by mixing three colors and the CCFL is white. For example, in the case of the unexamined Japanese Patent Application Publication No. 54-155244, especially when an LED is used as a light source, it is necessary to have a relatively long distance from the light source to the diffusion plate. As a result, the lighting device becomes thick. In the meantime, the technique proposed in the Unexamined Patent Application Publication No. 2005-3268 19 can be used in the case of using CCFL (the system, the line source), and in the case of LED (the point source). There are problems with brightness irregularities and color unevenness. The present invention has been devised from the viewpoint of the above problems, and it is desirable to provide an optical film using one of the illumination devices and a display element in which brightness is irregular and color unevenness is used even in a thinner illumination device. In the case of a light source, it is still reduced. In accordance with an embodiment of the present invention, there is provided an illumination device having a plurality of point sources 'which are arranged in a plane with each other; and — an optical thin 130234. doc 200912197 a sheet disposed in an area facing the plurality of point sources in. The point sources are arranged in a first direction and also in a second direction intersecting the first direction. The light sheet has a two dimensional configuration. The three-dimensional configuration includes a first ridge extending upwardly from a third party that is affixed to the first and first directions, and a second ridge extending in a direction intersecting the first, first, and second directions. A specific embodiment of the present invention provides a display element comprising a panel that is driven in accordance with an image signal, a plurality of point sources disposed in a region facing the panel, and an optical sheet configured to: The panel is between the plurality of point sources. The plurality of point light sources are disposed in the first direction and also in a second direction intersecting the first direction. The optical sheet has a three-dimensional configuration, and includes a first ridge line extending in the first and second directions, and a second ridge line extending in a direction intersecting the first, third, and third =.

U In a lighting device and display element of a particular embodiment of the invention, the light and the sheet comprise a three-dimensional configuration in which the first and second ridge lines extend over each other: By this configuration, when a light beam is emitted from the light source to the optical sheet, it is generated by one of the light source images - the light ❹ = this way is divided into a plurality of optical thin W The image makes the space between the cut light source images narrower than the space between the individual point light sources in a direction different from the extending direction of the three-dimensional configuration ridge lines (first and second ridge lines) provided on the optical sheet (the first point The light source is arranged parallel to

m m, the direction of the extension of the ridge line in the direction of the n brother, can reduce or avoid overlapping of the split source image. J 130234.doc 200912197 In accordance with an embodiment of the present invention, a first side extending in a direction and a second side extending in a direction from the parent are provided. The optical film has three intersecting with the extending directions of the first and second sides, respectively. A ridge line and a second ridge line extending in the direction in which the first side and the first π extension are extended, and the extension direction of the first side and the extension direction of the first ridge line are in the direction of the father.光学 光学 The optical film of the specific embodiment of Qian Ming includes a three-dimensional configuration having intersecting each other and a second ridge line. By configuring the fine configuration, when a plurality of point source systems are placed in the area facing the optical film, and the first point is from the point source to the optical source, the point source is The resulting image is divided into a plurality of images so that the distance between the individual split source images is narrower than the space of the individual point sources. Further, the ridge line intersects the extension direction of the first and the bay 1 respectively, and the second ridge line intersects the extension direction of the __ and second side k and the extension direction of the ridge line, respectively. With this configuration, the point source mentioned above is two-dimensionally arranged along the direction of the intersection of the (-) and the first and the ridgelines: a ship and a superposition (like the general, along the first And when the second side is arranged in a two-dimensional direction in a nearly flat direction), and the point source is arranged in a direction parallel to the direction of the ridge line providing the two-dimensional configuration on the optical film... reducing or avoiding overlapping of the divided light source images . According to a specific embodiment of the present invention, the illumination source and the display are in a direction different from the ridge line (the first and second ridge lines) provided on the optical sheet (the first and second ridge lines). The second array direction is configured, so that the virtual point source is arranged in a direction parallel to the direction of the ridge line of the three-dimensional configuration provided on the optical sheet. The daytime α can reduce or avoid the split source image 130234.doc 200912197 overlap. Therefore, even when a point light source is used in the thinner illumination device t, luminance irregularity and color unevenness can be reduced. In an optical film according to a specific embodiment of the present invention, the first ridge line extends in a direction intersecting the extending direction of the first and second sides, respectively, and the second ridge line is respectively associated with the first and second sides The extension direction of the first ridge line extends in two directions. The # thus configured to reduce or avoid overlapping of the split source images when the plurality of point source sources are disposed in an area facing the optical pupil in a direction intersecting the first and second ridge lines. Therefore, even when a point light source is used in a thin illuminating device, brightness irregularity and color unevenness can be reduced. Other and further objects, features and advantages of the present invention will be apparent from the description. [Embodiment] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings 〇W1 showing a display group f of display elements! according to the first embodiment of the present invention. Figure 2 is a perspective view of a main portion of the display element 1 in Figure 1. It should be noted that Figures 1 and 2 are only general solutions, and B 卞 is not necessarily the same as the actual size and group state. The display element 1 includes a display device, a display device, a liquid crystal display panel 20 disposed in front of the illumination device 10, and a display panel for displaying the image. The driving circuit is inflamed, the road (not shown) is in the display element 1, and the liquid crystal display panel 20 faces the viewer...^1. In the present embodiment, ', the surface of the liquid crystal display panel 2 is considered to be orthogonal to the horizontal plane. 130234.doc 200912197 Liquid Crystal Display Panel 20 The liquid crystal display panel 20 (although not illustrated) has a stacked configuration in which a liquid crystal layer is provided between the transparent substrate on the viewer side and another transparent substrate on the side of the illumination device 1. Specifically, the liquid crystal display panel 2 includes a polarizing plate, a transparent substrate, a color filter, a transparent electrode, an alignment film, a liquid crystal layer, and another alignment film, which are sequentially disposed from the viewer side. One transparent pixel electrode, another transparent substrate and another polarizing plate. i) The polarizing plate is only one of the optical shutters that transmit - the light wave in the clear pattern - vibration (polarization). The two polarizing plates are arranged such that their individual polarization axes are orthogonal to each other, thereby transmitting or blocking the emitted light from the light source 4 to penetrate the liquid crystal layer. The transparent substrate is a substrate that is transparent to visible light, such as a plate glass. The active matrix drive circuit (which includes a TFT (Thin Film Transistor) as a driving means for electrically connecting to a transparent pixel electrode and wiring, etc.) is disposed on a transparent substrate close to the light source 4. The filter and color patches include color passages for separating the emitted light from the light source* into three primary colors such as red (R), green (G), and blue (B), respectively. Transparent electrodes are typically made of IT(R) and act as a common counter electrode. The alignment film is usually made of a polymer material such as polyimide and performs alignment processing on the liquid crystal. The liquid crystal layer is usually made of VA (vertical alignment) mode, TM (twisted nematic) mode or STN (super twisted nematic) mode liquid crystal & and acts to transmit or block pixels when voltage is applied from the driving circuit. The emitted light from the light source 4 is carried. The transparent pixel electrode and suspension are made of IT0 and act as electrodes for each pixel. The illumination device 1 〇 the illumination device Η) comprises a plurality of point sources 12 . The illuminating device 1 通常 〇 234 234 234 234 234 234 234 234 234 234 234 234 234 234 234 234 234 234 234 234 2009 2009 2009 2009 2009 2009 2009 2009 2009 点 点 点 点 点 点 点 点 点 点 点 点 点 点 点 点 点 点 点I5, a plurality of rectangular optical sheets reflecting a polarizing sheet I6, and the like, and additionally including a reflective sheet on the rear side of the point source 12. The illumination device 1 further includes a housing 17 for supporting the above-mentioned optical sheet and liquid crystal display panel 20. Thereafter, the reflective sheet u, the diffusion sheet 14, the brightness enhancement film 15, and the reflective polarizing sheet 16 will be explained first, and then the point light source 12 and the light source image segment sheet 13 will be described. Reflective Sheet 11 The reflective sheet 11 is typically made of foamed PET (polyethylene terephthalate), a silver deposited film or a multilayer reflective film. It functions to re-reflect light partially reflected by the light source image segmentation sheet 13, the diffusion sheet 14, the brightness enhancement film 15 and the reflective polarizing sheet 16 in the direction of the liquid crystal display panel 2, thereby enabling efficient use of the point source 12 The light that is emitted. Diffusion Sheet 14 The diffusion sheet 14 is, for example, a thin optical sheet formed by applying a transparent resin containing a light-diffusing material to a relatively thin film of a transparent resin. Here, examples of the transparent resin film include a light transmissive thermoplastic resin such as pET, acrylic or polyphthalate. Examples of light diffusing materials include acrylic acid and polyfluorene having a shape of about several micrometers in a spherical shape. By this composition, the diffusion sheet 14 acts to diffuse the image of the light source generated by the segmentation sheet u of the light source image and enhance the brightness in the front direction. Luminance Enhancement Film 15 The redundancy enhancement film 15 typically includes a plurality of thin rods 15A. The thin film 130234.doc 200912197 is a virtual piece of the columnar crucible 15 A along the bottom surface of the brightness enhancement film j 5 The planes are extended and continuously arranged side by side such that the surface shape of the brightness enhancement film 15 forms a repeating pattern of the columnar crucible as shown in FIG. The brightness enhancement film 15 is made of a translucent resin material. With this configuration, the brightness enhancement film 15 refracts and transmits only one light component propagating in the direction of arrangement of the 稜鏡ι5Α between the light entering from the bottom surface thereof along the normal line of the bottom surface thereof, thereby providing high pointing. Sex and increase the front brightness. It is also possible, for example, to configure the two pieces of brightness enhancement film 15 in such a manner that the direction in which the turns 15A extend is orthogonal to each other as shown in Fig. 3. Further, although the cymbal 15A is an angular prism having a large apex as illustrated in Figs. 2 and 3, it is not limited thereto and the apex may be, for example, round or moved in the direction of the ore. Further, although FIGS. 2 and 3 illustrate the case where the shuttle mirror i5 A extends in a direction intersecting the array direction L1, L2 (refer to FIG. 4) of the point source 12 mentioned later, it may be in the direction of the array with the point source 12. U and L2 extend in parallel. The reflective polarizing sheet 16 Q & polarizing sheet 16 has a multilayer structure which is usually formed by alternately stacking layers each having a refractive index different from each other, and functions to polarize and split (the directivity of light has been improved by the brightness-reinforcing film 15) 'To make only the component of the light that is polarized along the direction of the transmission axis of the incident polarizer of the liquid crystal display panel 20, and to selectively reflect the light of the polarized light in the direction of the absorption axis of the incident polarizer of the liquid crystal display panel 20 . . ^ Where the W knife. Since the reflected light from the reflective polarizing film 16 is reflected back again by the reflection 4 1 1 and is polarized in the illumination device 1 at this time, it is circulated. Point source 12 130234.doc 12 200912197 Each point of light source 12 is typically composed of one or more monochromatic LEDs (only emitting a color beam), or a plurality of three primary colors each emitting a red, green and blue beam. composition.

Cj As shown in FIG. 4, the point light source 12 is in a direction L1 (first direction) intersecting the side of the light source image segment thin moon u extending at a predetermined angle in one direction (the X-axis direction in FIG. 4). Arranged in an array and also intersecting the side of the light source image segmentation sheet 13 extending at a predetermined angle in one direction orthogonal to one direction (the direction of the X-axis) (the direction of the γ-axis in Fig. 4) The directions L2 (second directions) are arranged in an array. Here, the array direction of the point source 12 includes the following two directions: one of the shortest segments (referred to as direction A for convenience), which is from one of the point sources 12 to be disposed near the point source 丨2 The point source is closest to the point source - 3 of the point source 12 (if there are two or more closest point sources 12 near the point source 12, any of them); One of the shortest segments, from the one-point source 12 to another point source 丨2 that is disposed closest to the point source 12 between a plurality of point sources disposed in one direction orthogonal to the direction A when viewed from the point source a. When each point light source 12 is composed of a single LED that emits only one of red (R), green (G), and blue light beams or consists of a plurality of LEDs that individually emit three primary colors of RGB, the array direction is as follows. The rules mentioned are determined for each color. It is desirable that the distance p3 between adjacent point light sources 12 in the direction L1 is equal to the distance P4 between adjacent point light sources 12 in the direction L2, but they may be different from each other. Here, the space between the adjacent point light sources 12 refers to the space (distance) between the adjacent point light sources 12 disposed on the array side J 7 and 130234.doc -13·200912197. At each point source 12 consists of a single LED that emits only one of red (R) 'green (G) and blue (B), or a plurality of LEDs that individually emit three primary colors of RGB, the distance between them The rules mentioned above are determined for each color. Light source image segmentation sheet 13 Light source shirt image segmentation sheet 13 is based on the three-dimensional configuration of the method to make a plurality of dog discharges 13 A and a plurality of protrusions! 3B (for example) is alternately arranged thereon

On the surface (on the light-emitting side), as shown in Figure 4. Each of the protrusions 13 is composed of one of the ridges R1 (the first ridge line) and the inclined surface I, and each of the protrusions 13B has a ridge line called a second ridge line therebetween. One of the pair of slopes S2 is composed. "The 1 line R1 here is almost flush with the bottom surface (incident side) of the light source image segmented sheet 13 and extends in a direction where the predetermined angle Θ1 intersects the array direction of the point light source 12 (refer to Fig. 5). They extend in parallel with the source image segmentation sheet & face 4 and intersect at a predetermined angle 02 with another array direction L2 of the point source 2 (refer to FIG. 5). That is, the source image is divided into a wide film. The ridge line R1_ of η extends in a direction different from the array direction (4) 2 of the point source 12. Although the figure is an example in which the direction of extension 13x and 13y of the segment of the light source image is extended = However, it is also possible, for example, that the ridge illusion and the R2 are respectively parallel to the side of the light source image segmented sheet 13 and the extension direction of the 3y direction = the second direction is in the direction of the X axis as the ridge (four) and the y axis is the ridge line. They are called expression function expression protrusions with surface configuration and function dog material 13B surface configuration, light source image segmentation sheet] 3 has 130234.doc 14 200912197 meets the function Max [f(x), f(y)] Surface shape. Here, Max [f(X), f(y)] is equal to and is f in the case of f(x)H(y) x) A function equal to f(y) in the case of <f(y).

As shown in FIG. 6A, the surface shape of the pair of slopes s] is symmetrically opposed to each other as upwardly inclined toward the top of the central ridge line R1 to have a three-dimensional configuration such that the direction orthogonal to the ridge line IU (the axis of the axis) The cross section of the intercepted object "A may be a heptagon, configured since the symmetry ridge; and together form a bevel and have an inclination (the angle between the bottom line of the protrusion 13A and the individual inclined surface) cpyi, The three inclined surfaces Sn, 812, and 313 of cpy2, cpy3 (where 1>(^2>_ can be sequentially arranged toward the central ridge line R1 from the groove 13C disposed between the adjacent protrusions 13A. The width of L, Si? and s" (when it is convex on the bottom surface of the light source image segmented sheet 13 is measured by the direction of the baby), the optimum ratio of the twist is based on The luminous intensity distribution of the point source 12 is determined. For example, when the luminous intensity of the point source 12 has a Lambertian distribution typical of ordinary coffee, the preferred ratio of the width satisfies the relationship of the young kiss (10). In other words, the surface shape of the pair of inclined Si can be in this manner The three-dimensional configuration enables the section of the protrusion UA to be pentagon shaped along the direction orthogonal to the ridge line R1 (the direction of the Y-axis), and the symmetrical ridge line ri is configured, as shown in the figure, 'Be not here' The inclined planes S1 are formed together and have inclination angles respectively (angles between the I line of the protrusions 13A and the individual inclined surfaces) (4) Thin 5 (where <py φγ) of the two inclined surfaces s] 4 and s" can be toward the central ridge line μ The width of the surface S14 and the core 5 are sequentially arranged from the groove 13c disposed between the adjacent protrusions 13 (when it is segmented in the image of the light source. The surface of the individual inclined sheet 13 is convex 130234.doc -15- 200912197 The ratio of 4 is measured in the γ-axis direction, and the optimum ratio of the width is determined according to the luminous intensity distribution of the point source 12. For example, when the luminous intensity of the point source 12 has a typical Lambertian for ordinary LED When distributed, the preferred ratio of width satisfies the relationship of young 4 > young 5. .../bear, the heptagon or pentagon section of the protrusion 13A is only an example 'and any other polygon such as a heptagonal and a pentagon may be used. Configure 'or a combination of lines and curves. As shown in Figure 6B' The surface shape of the slope is symmetrical with respect to the top of the central ridge line to be symmetrical with each other to have a three-dimensional configuration, such that the section of the protrusion 13b taken along the direction orthogonal to the ridge line R2 (the direction of the X-axis) It may be a heptagon, configured with a symmetrical ridge R2; and together form a slope s2 and have an inclination (the angle between the bottom line of the protrusion 13B and the individual inclined surfaces) φ χΐ, φ χ 2, φ χ 3 (where φ χ 1 > 3) The three inclined surfaces szi, S22, and S23 may be sequentially disposed, for example, toward the center ridge line R2 from the grooves 13C disposed between the adjacent protrusions 13B. On individual inclined surfaces L, ^2 and . The width of S23 (measured in the X-axis direction when protruding on the bottom surface of the light source image segmented sheet 13) is represented by Δχ, Δ〜 and ΔΧ3, and the optimum ratio of the width is based on the point source 12 The luminous intensity distribution is determined. For example, when the point "the luminous intensity of the source 12 has a Lambertian distribution typical for a normal LED, the width ratio of the ratio satisfies the relationship. In another example, the surface shape of the pair of slopes h can be three-dimensionally configured in such a manner that the section of the protrusion 13B can be pentagon when loaded in the direction orthogonal to the ridge line R2 (four), and its symmetry The ridge line R2 is configured as shown in Figure 7B. Here, the two inclined surfaces 324 and § 25 which form the inclined surface S2 and respectively have an inclination angle (the angle between the bottom line of the product 13B and the individual inclined surface) 130 (wherein φ χ 4 > φ χ 5) The central ridge line R2 is sequentially arranged from the groove 1 3 C disposed between the adjacent dog discharges 1 3 B. The width of the individual inclined surfaces S24 and S25 (measured in the X-axis direction when convex on the bottom surface of the light source image segmented sheet 13) is expressed by the same, and the optimum ratio of the width is based on the light of the point source 12. The intensity distribution is determined. For example, when the luminous intensity of the point source 12 has a Lambertian distribution typical of a normal LED, the preferred ratio of the width satisfies the relationship of Δχ4 > Δχ5.

Here, the number of types of inclined surfaces such as Sn constituting the inclined faces 81 and 82 and the inclination angle of each type of inclined surfaces such as Φ Χ 1 are determined by the arm lengths D1#D2 of the light source images 1! to 14 mentioned below ( Refer to Figure 1 ()) how long it should be set to adjust. This is caused by (as shown in Fig. 8) that the larger transmission angle is called the angle between the normals of the light source transmitted from the transmission surface of the source image segmented sheet 13 and the position between the point source 12 and the source image. Learn about the facts of distance. In fact, however, the permeation angle Gc depends not only on the number of cheeks such as the inclined surface of S" and its inclination as φχΐ, but also depends on various other factors, such as ^u 戈攸 Point source 12 to the source image of the slave slice 13 distance η, point source 12 more _ ^ Xing from the transmission point of the first bundle of the transmission point vertically extending the distance between the imaginary lines w, electricity · the source image segmentation sheet The refractive index of 13 is arranged in the image segmentation cage y of the light source. The refractive index of the medium between the four sheets 13 and the point source 12 and the emission point of the beam E are accompanied by the refractive index of s -1 . Therefore, the arm lengths m and D2 are determined from the viewpoint of all of the above. By this configuration, for example, the light modulates you. . . . as the segment sheet u refracts between the light emitted from the point source 12 and transmits through the angle 箄 equal to or less than the critical angle into the bottom 130234.doc -17. 200912197 Face or bevel s〗, s2 light 'and reflect more than the critical angle into the full # other light. Therefore, the function of the light source shirt image generated by each of the point light sources 12 is divided into a plurality of images according to the number of types of inclined surfaces of the slanting surface 8 and § 2. That is, when the light having the optical source shown in FIG. 9 is emitted from the point source 丨 2 to the light source image segment sheet 13 for example, the light source image segment sheet 13 will be in the point source 12 The image of the light source (not shown) generated by each of them is divided into several images as shown in Figs. 10, 12 1 and 13 (which will be fully explained later) so that the figure ί is, for example, The space between the divided light source images n to 14 (〇4 to D7) is narrower than the distance between adjacent point light sources 12 (P3 and P4). In this way, the difference between the maximum brightness level of the light source ~ like II to 14 after splitting and the minimum brightness level of the space (dark part) between the light source images η after segmentation and the maximum brightness level of the light source image before segmentation and The difference in the minimum brightness threshold of the space between the light source images may be reduced, thereby reducing the illumination brightness irregularity. Therefore, the light source image segmentation sheet 13 is also a type of diffusion plate. 〇 It should be noted that the light source image indicates the peak luminance value J (four) luminous flux in the luminance distribution of the light, and the space between the light source images is the in-plane distance between the peaks of adjacent luminous fluxes in the luminance distribution. The light source image segmented sheet 13 is entirely made of a translucent resin material such as a thermoplastic resin, or may be hardened by transferring energy rays (such as ultraviolet rays) on a translucent base material such as PET (polyethylene terephthalate). Resin is formed. As illustrated in FIG. 10 and FIG. 13 , the 'source image segmentation sheet 13 is formed by dividing the original source image generated by the light source 12 into a plurality of images. i I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I Light source image! i to 14. The configuration and arm width of the source image Η to Μ do not depend on the in-plane configuration of the point source 12, but are determined by the three-dimensional configuration of the segment 13 of the source image. Thereby, for example, as shown in FIGS. 14 and 15, even if the ridge line R1 of the light source image segmentation sheet 13 is extended in a direction parallel to u (the point light source thereof is in one of the array directions), and the light source image is divided. When the ridge line R2 of the segment sheet 13 extends in a direction parallel to L2 (the point light source is in the other-array direction), the light source image also forms a letter shape (cross-shape). However, when the individual point sources 12 are arranged along the ridges ri, R2, 隹 of the source image segmentation sheet 13, the arms adjacent to the source image will overlap each other' as shown in Fig. 16. Figure 17 shows the results of the in-plane luminance distribution calculated using simulated light. Here, the field of view of maximum brightness is set to! And the minimum field of view is set to 〇. According to this, the overlapping portions are inferior to those of the other knives, whereby the effective reduction of the brightness irregularity cannot be provided. At the same time, in the present embodiment, the light source image segmentation thin >

The Rim angle Θ1 extends over the direction intersecting L1 (which is one of the array directions of the point source 12) (refer to FIG. 5), and the ridge line R2 of the source image segmented sheet 13 is at a predetermined angle θ2 with L2 The direction of intersection (which is in the other-array direction L2 of the point source 12) extends (see Fig. 5). In this way, the ridge lines R i and R 2 of the light source image segmentation sheet 13 can be reduced or reduced in the direction parallel to the array direction L1 and L2 of the point source i 2 , respectively.

To eliminate the overlap between the images of the split source. In this way, a reduction in brightness irregularity can be provided. X 130234.doc • 19- 200912197 In the present embodiment, the ridge line R1 is simultaneously ridge line R2 including Μ and L2 (the array direction of the point source 12) and the three-dimensional configuration source image segmentation sheet Π The direction in which the three directions of extension extend intersects, as shown in Figures 4 and 5. The ridge line R2 extends in the direction intersecting the three directions including the array directions L1 and L2 of the point light source 12 and the ridge line extending direction of the three-dimensional configuration light source image segment sheet 13, respectively. Then, the angle between the ridge line R1 and the array direction L1 is Θ1, and the angle between the ridge line R2 and the array direction L2 is Θ2'. It is desired to define the ridge line 丨 and R2 of the light source image segmentation sheet 13 such that the rotation angle θ 1 is Θ2 simultaneously satisfies the following inequalities: 10°<Θ1<40° 10°<Θ2<40° When the array directions L1 and L2 are orthogonal or nearly orthogonal to each other, it is more desirable that the rotation angles Θ1 and Θ2 satisfy the following equations : Θ1=Θ2=25° Here, when defining the ridge lines r 1 and R2 of the light source image segmentation sheet 13 so that the angles of Θ1 and Θ2 become 25 degrees, the light source images II to I4 (D4, D5, D6, D7) The space becomes almost the same, as shown in Figure 10. By this configuration, the uniformity of the in-plane distribution of the space (dark portion) between the light source images 11 to 14 can be made, thereby significantly reducing the brightness irregularity. It should be noted that D4 is the distance between the side of the light source image η and the arm of the 13 in the direction in which the ridge line ri extends, and D5 is the end portion of the arm of the light source image 12 in the direction in which the ridge line R1 extends and the light source image. The distance between the sides of η. The distance between the side of the light source image I 丨 and the arm of the π in the direction in which the ridge line R2 extends, and D7 is the end of the arm of the light source image 14 in the direction in which the ridge line R2 extends. 130234.doc -20- 200912197 The distance between the portion and the side of the arm of the light source image 12. Fig. 11 shows the results of the in-plane luminance distribution when the ridge lines Ri and R2 of the light source image segmentation sheet 定义3 are defined so that the rotation angles Θ1 and Θ2 can be 25 degrees (which are calculated using an analog beam). Here, the field of view of the maximum brightness is set to 1 ' and the field of view of the minimum brightness is set to 〇. According to the figure, the luminance distribution produced by any of the point sources does not overlap with the luminance distribution of the other sources, thereby significantly reducing the brightness irregularity. When defining the ridgelines R1 and R2 of the source image segmentation sheet 13 such that the angles θ 1 and Θ 2 may be greater than 1 ( (which is the lower limit angle available) and less than 4 ( (the upper limit angle available) Avoid overlapping of the light source images ^ to ^, as shown in Figure 12 (when Θ1 and Θ2 are near the lower limit of 10 degrees) and Figure 13 (when Θ1 and Θ2 are near the upper limit of 40 degrees), thereby reducing the irregularity of brightness Sex. When the arm lengths D1 and D2 of the light source images II to 14 are shorter than the arm lengths shown in FIGS. 10, 12 and 13, the lower limits of θ 1 and Θ 2 may be set to be smaller than the lower limit of 10 degrees mentioned above. Or it can be set to be greater than the upper limit of 4 degrees mentioned above. However, in this case, the distance (the dark portion) of the individual light source images 丨丨 to 14 is increased, thereby reducing the effect of the reduction in luminance irregularity. Therefore, it is desirable that the inclined surface of the inclined surface (which constitutes the inclined surface S of the light source image segmented sheet 13) and S2) is appropriately set so that the arm lengths D1 and D2 of the individual light source images II to 14 can be satisfied. The following expression: D1 > P3/2 D2> P4/2 Hereinafter, an example of a method of forming the light source image segmented sheet 13 of the present embodiment will be explained with reference to Figs. Figure 1 8 shows that in the first month of your y pregnancy, the direction is cut 130234.doc -21

In the manufacturing method of the present embodiment, the 200912197 of the light source image segmentation sheet 13 uses the example of the IS tooth configuration of the cutting tool VI. Fig. 19 is a view schematically showing the state in the process of cutting the original sheet M in the y-axis direction using the cutting tool VI. Figure 20 shows an example of the sawtooth configuration using the cutting tool 乂 2 when cutting in the X-axis direction. Fig. 21 is a view schematically showing the state in the process of cutting the original sheet in the direction of the boring using the cutting tool. Fig. 22 is a perspective view showing the configuration of the top surface of the original sheet which is processed after the cutting operation. It is shown in 19 that the flat top surface of the original slab is cut in the 7-axis direction using a cutting tool ¥1 having a saw* as shown in Fig. 18. When the cutting operation in the y-axis direction is completed, it is then used as shown in FIG. A cutting tool having a sawtooth as shown in Fig. 20 cuts the treated top surface of the original sheet in the direction of the yaw axis. In this way, the original sheet having the three-dimensional surface configuration as shown in Fig. η has been manufactured. , which is the opposite of the protrusions 13Α and 13Β of the light source image segmentation sheet 13. The next procedure is to push the original plate Μ (which is then inverted upside down so that its three-dimensional surface configuration face down) to be placed on a plane. The semi-transparent resin material. Then, the energy such as heat is applied to the resin material which has been pressed against the original plate to harden the resin material. In this way, the three-dimensional configuration of the original plate is transferred, thereby forming a light source. Like the segmented sheet 13. The three-dimensional configuration of the reverse surface is provided on the original sheet by cutting in the X-axis direction and the y-axis direction. Therefore, the source image segmented sheet 13 is manufactured at a cost. The intersection may be easier and lower, and then the illumination device according to the embodiment 130234.doc • 22· 200912197 will be described in comparison with the illumination device of the comparative example. Examples 1 and 2, and Comparative Example 1 With 2 and the comparison example!, use the top emission LED of 〇sram 〇pt semiconductor, point light source! Each of 2 is composed of four l £ d. One blue LED, two green LEDs and one red LED To form an LED cluster. The distance between the point light sources 12 is 〇3 and 1>4, respectively, 4 mm. The RF220 (trademark) of TSUJIDEN Co., Ltd. is used as the reflective sheet u. The reflective sheet 11 is drilled according to the bottom contour of the point source 12. The holes cause the point light source 12 to protrude therefrom, whereby the point source 12 is disposed on the top surface of the reflective sheet 11. In the specific embodiments 1 and 2, the source image segmented sheet 13 is disposed away from the reflective sheet 11 30 mm In ratio In the example, a diffuser plate is disposed at the same position instead of the light source image segmentation sheet 丨3. In the example, there is a light source image segmentation sheet 13 having the cross-sectional configuration of Figs. 6A and 6B, and In the example 2, there is a light source image segmentation and a k-sheet 1 having a cross-sectional configuration of Figs. 7 and 7B. The light source image segmentation sheet j 3 is configured in such a manner that the light source image segmentation sheet 13 is The angle θ1 between the ridge line Ri and the array direction of the point source 12 is 25 degrees from the ridge line R2 of the source image segmented sheet 13 and the array direction L2 of the point source 12, respectively. In Comparative Example i, A diffuser plate containing filler (pC 9391 (65HLW) (trademark) of Teijin Chemical Co., Ltd.) instead of the light source image segmented sheet 13. As the diffusion sheet 14, D141Z (trademark) of TSUJIDEN Co., Ltd. was used. 3M of BEFIII (trademark) was used as the brightness enhancement film 15'. As the reflective polarizing sheet 16, 3M DBEF-440 (trademark) was used. The in-plane luminance distribution is measured to quantitatively estimate the luminance irregularity using a CCD camera 130234.doc -23- 200912197. When measuring the brightness irregularity viewed from the oblique direction, the CCD camera 30 is disposed in the vertical direction of the illumination device 1 as shown in Fig. 23. At 4 o'clock, the angle between the optical axis Αχ2 of the CCD camera 30 and the normal AX1 of the illumination device ι is the transmission angle α, and the azimuth angle β of the optical axis AX2 of the CCD camera is in the range of 〇 to 6〇. The measurement is performed in increments of 15 degrees, and the measurement area is set to (10)_X 1 00 mm.

In Examples 1 and 2 and Comparative Example i, respectively, in the case where one sheet of the brightness enhancement film 15 is used and in the case where two pieces of the brightness enhancement film 15 are used, from FIG. 24 to "α to FIGS. 29A to 29C, respectively. Luminance distribution. Here, representative directions indicate three directions (vertical direction (α=〇., β=〇.), tilt direction (α=45., β=〇.) and another tilt direction (α). =45〇, ρ=9〇〇)). In these figures, 'with (+2〇mm, +2〇mm), (+20 mm, -20 mm), (_20) in the array Point light source 12 is placed at four positions of the coordinates of the bribe, +2〇mm) and (2〇, • 20 mm). These patterns are based on the difference between the expensiveness and the average degree of exemption. Dark black part Represents the field of view within the range of ±0.5% from the mean, so that the larger the field of view, the smaller the difference. The level of brightness irregularity can be properly distinguished only by examining these patterns, but to obtain more Easy to understand estimates, the proportion of irregularity is defined as follows: Irregularity ratio = (maximum brightness - minimum brightness) / average brightness here Maximum brightness means the maximum brightness in the in-plane brightness distribution, and minimum brightness means the minimum brightness in the in-plane brightness distribution. Average brightness 130234.doc •24· 200912197 Degree means the average value in the in-plane brightness distribution The lower the proportion of irregularity, the more comprehensive the suppression of brightness irregularity and color unevenness. The proportion of irregularity is determined by the range of all available measurement angles in individual cases, thereby forming a cylindrical coordinate. a system that indicates how the proportion of irregularities in the pseudo-color is distributed over the measurement angle (hereinafter referred to as an angle-based distribution). The results are shown in Figure 30. The results obtained suggest that the specific embodiment _ is irregular The ratio of the sex is smaller than the ratio of the irregularity of the comparison (4) when using the film or the two pieces of brightness enhancement 。15. As understood from Fig. 30, the results such as Xiao also suggest that the above mentioned characteristics are especially in the use of two pieces. The brightness enhancement film 15 becomes more conspicuous, so that the use of the two pieces of the brightness enhancement film 15 can comprehensively suppress the brightness irregularity and the color unevenness when viewed from any angle. These results also suggest that the distance between the reflective sheet 11 and the source image segmented sheet 13 can be sufficiently narrowed without exacerbating the degree of irregularity and color unevenness. Comparative Examples 2 and 3 Next, unlike Examples 1 and 2, Also in the light source image segmentation sheet 13 is arranged in such a manner that the ridge line 丨 of the light source image segmentation sheet 13 and the array direction of the point source 12 are at an angle of 1^ and B2... In the comparative example 2, the brightness enhancement film 15 is disposed such that the angles 91 and 02 are set to zero degrees, and in the comparative example 3, the brightness enhancement film 15 is disposed such that the angles Θ1 and Θ2 are set to 45 degrees. Here, in Comparative Examples 2 and 3, a light source image segmented sheet 13 having a sectional configuration of Figs. 7 and 76 similar to that of Example 2 is used. The procedure mentioned above measures the brightness irregularity and calculates the distribution of the angles 130234.doc -25- 200912197. In Comparative Examples 2 and 3, the luminance distribution in the case of using the sheet brightness enhancement film 15 and in the case of using the two pieces of the brightness enhancement film 15 is shown in Figs. 3a to hC to Figs. 34A to 34C, respectively. Here, the representative directions indicate three directions (vertical direction ((4), (4))), tilt direction (α=45., β=〇.), and another tilt direction (α=45., β=9). 〇.)) The result. The results obtained suggest that the twist irregularity and the color unevenness are more effectively suppressed in the case of the example 2 than in the case of the comparative examples 2 and 3, especially when the two pieces of the brightness enhancement film 15 are used. The present invention has been described with reference to the particular embodiments and examples. However, the invention is not limited to the specific embodiments and examples. For example, in the above-mentioned specific embodiment or the like, the ridge line R1 of the light source image segmentation sheet 13 extends at a predetermined angle Θ1 in a direction opposite to the array direction L1 of the point source 12 (refer to FIG. 5). And the ridge line imx of the light source image segmentation sheet η is extended in a direction intersecting the quasi-column direction u of the point source 12 (refer to FIG. 5). To obtain this configuration, the ridge lines of the t-source image segmentation sheet 13 are illusory and illusory with the array of point sources 12. The direction is different in the direction of extension, there are two configurations. One example system (in Figure 4) does not configure the point source 12 such that its array direction [I and η can be parallel to the side wall of the outer casing 17; another example is (Although not shown) the point source 12 is configured such that its margins L1 and L2 can intersect the wall of the casing m. In the specific embodiments mentioned above, although the specific configuration of the LCD has been described 'however, the LCD does not necessarily include all layers' or it may additionally include other layers of 130234.doc • 26·200912197. For example, in the above-mentioned points "n... and the specific example, although the light source image 4 sheets 13 are made of a translucent base material, they may contain a grass-dispersed material (filler). In addition, in the above-mentioned specific examples, the space between the light source image segmented sheet 13 and the diffusion sheet 14, the space between the friend enhancement film 15 and the reflective polarizing sheet 16, and the use of the dicentricity enhancement film The space between the brightness enhancement film 15 and the upper brightness enhancement film at 15 o'clock is preferably filled with air. However, it can be filled with a specific medium outside the air. '

熟 Those skilled in the art should be aware that various modifications, combinations, sub-combinations, and alterations may be made in accordance with design requirements and other factors, as long as they are within the scope of the accompanying patent application or its equivalent. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a sectional configuration view of a display element according to a first embodiment of the present invention. 2 is a perspective view showing an example of the brightness enhancement film of FIG. 1. Figure 3 is a perspective view showing another example of the degree of reinforcement film of Figure 1. 4 is a perspective view showing the point source of FIG. 1 and the segmented sheet of the source image. Fig. 5 is a schematic view for explaining the relationship between the ridge line of the segmented sheet of the light source image and the arrangement of the point source of Fig. 1. Figure 6 is a conceptual diagram of an example of a three-dimensional configuration of a light source image segmented sheet of Figure 1 and Figures 7A and 7B are diagrams showing another example of a three-dimensional configuration of the source image segmented sheet of Figure 1. Figure. Figure 8 is a conceptual diagram showing the operation of the light source image segmentation sheet of Figure 1. 130234.doc -27- 200912197 Figure 9 is a characteristic diagram showing an example of the optical properties of the point source of the image. Fig. 10 is a conceptual diagram showing an example of the operation of the light source image segmentation sheet of Fig. 1. Figure 11 is a graph showing the optical properties of the segmented sheet of the source image of Figure 10, calculated in a simulated model. Fig. 12 is a conceptual diagram showing another example of the operation of the light source image segmentation sheet of Fig.

U Fig. 13 is a conceptual diagram showing another example of the operation of the light source image segmentation sheet of Fig. Fig. 14 is a perspective view showing an enlarged main portion of a display element according to a comparative example. Fig. 15 is a view for explaining the relationship between the ridge lines of the light source image segmentation sheet of Fig. 14 and the arrangement of the point light sources. Figure 16 is a conceptual diagram showing the operation of the light source image segmentation sheet of Figure 14. Fig. 17 is a characteristic diagram showing the optical properties of the segmentation thin of the light source image of Fig. 16 calculated by the simulation model. Fig. 18 is a schematic configuration diagram of the sawtooth of the cutting tool used for manufacturing the light source image segmentation sheet of Fig. i. Fig. 19 is a perspective view showing a state during the cutting operation in the y direction using the cutting tool of Fig. 18. Figure 2 is a schematic configuration diagram of the silver teeth of another cutting tool used in the manufacture of the light source image segmentation sheet of Figure i. Fig. 21 is a perspective view showing a state in which the cutter of Fig. 20 is in the process of cutting in the X direction. ,, 130234.doc -28- 200912197 _ View used in the manufacture of segmented sheets of light source images. Figure 23 is a pattern diagram for explaining a method of measuring the in-plane luminance distribution. Figs. 24A to 24(10) are characteristic diagrams showing the ratio of the plane luminance distribution and the irregularity obtained by the actual measurement according to the example 丨, in which the brightness of the sheet is too strong and the angle is 25 degrees.

25A to 25C show the use of two A τ in which a lunar maturity enhancement film is used and

The angle of C u is 25 degrees, and is a characteristic diagram of the ratio of in-plane luminance distribution and irregularity obtained according to the actual measurement of the example i. 26A to 26C are characteristic diagrams showing the ratio of the in-plane luminance distribution and the irregularity obtained by the actual measurement according to the example 2, in which a piece of a leptin T piece redundancy enhancement film is used and the angles of Θ1 and Θ2 are 25 degrees. . Figures 27A to 27C show the use of two mourning m-mesh redundancy enhancement films and the angles of Θ1 and Θ2 are 25 degrees, the ratio of in-plane luminance distribution and irregularity obtained by the actual measurement according to Example 2 Characteristic map. 28A to 28C are diagrams showing the ratio of the in-plane luminance distribution and the irregularity obtained by the actual measurement according to the comparative example using a piece of 谇 谇 ^ ^ 冗 增强 增强 增强 且 and the angles of θ 1 and Θ 2 are 25 degrees. Characteristic diagram. 29A to 29C are diagrams showing the ratio of the in-plane luminance distribution and the irregularity obtained by the actual measurement according to the comparative example, using two pieces of the ancient shackle net redundancy enhancement film and the angles of Θ1 and Θ2 are 25 degrees. Characteristic diagram. Fig. 30 shows the angular distribution of the ratio of the irregularities obtained in Figs. 24A to 29C. 31A to 3C are diagrams showing the ratio of the in-plane luminance distribution and the irregularity obtained by the actual measurement according to Comparative Example 2, in which the brightness enhancement film is used and the angle of _θ2 130234.doc -29. 200912197 is zero. Characteristic diagram. Figs. 32A to 32C are characteristic diagrams showing the ratio of the in-plane luminance distribution and the irregularity obtained by the actual measurement according to Comparative Example 2, in which two pieces of the brightness enhancement film are used and the angles of the angles are zero degrees. Figs. 33A to 33C are characteristic diagrams showing the ratio of the in-plane luminance distribution and the irregularity obtained by the actual measurement according to Comparative Example 3, in which one piece of brightness enhancement is used and 91 is 45 degrees from the angle. Figs. 34A to 34C are characteristic diagrams showing the ratio of the in-plane luminance distribution and the irregularity obtained by the actual measurement according to Comparative Example 3, in which two pieces of the brightness enhancement film are used and the angle of one is 45 degrees. [Main component symbol description] 1 Display element 10 Illumination device 11 Reflective sheet 12 Point light source 13 Light source image segmented sheet 13A Projection 13B Projection 13C Groove 13X Side 13Y Side 14 Diffusion sheet 15 Brightness enhancement film 130234.doc -30- 200912197

15A columnar 稜鏡16 reflective polarizing sheet 17 housing 20 liquid crystal display panel 30 CCD camera AX1 normal AX2 optical axis E beam 11 split source image 12 split source image 13 split source image 14 split source image M original board R1 ridge R2 ridge Line s, bevel s" inclined surface S 1 2 inclined surface S, 3 inclined surface S 1 4 inclined surface S 1 5 inclined surface S2 inclined surface s21 inclined surface S22 inclined surface 130234.doc -31 - 200912197 S23 inclined surface § 24 inclined surface S25 Inclined Surface VI Cutting Tool V2 Cutting Tool

130234.doc -32

Claims (1)

200912197 X. Patent application scope: 1. A lighting device comprising: a plurality of point light sources arranged in a plane with each other; and an optical sheet disposed in one of the plurality of point light sources; ~ - 纟中The plurality of point light sources are disposed in a first direction and also in a second direction intersecting the first direction, and the optical sheet has a three-dimensional configuration that is included in the first and the zeroth The two f-intersects - the third-party extended - the - ridge, and the same. A ridge line extending in one of the intersecting directions of the first, second, and third directions. 2. The illumination device of claim 1, wherein the light + cymbal includes the first ridge line therebetween and one of the pair of inclined surfaces facing each other and the second ridge line therebetween and opposite to each other with respect to the second inclined surface, And Π; determining the inclination angles of the individual first and second slopes such that by generating each of the plurality of point sources from the U at the beginning of the day The arm length D of each X-ray source image obtained by dividing the light source image into a plurality of images by the 4 optical sheets, and satisfying the following expression when one of the point light sources is defined as P: D> P/2. 3. The illumination device of claim 1, wherein the direction of extension of the first and second ridges is determined such that the images of the dome-shaped light sources do not overlap each other. 4. The illumination farm of claim 1 wherein the extension of the first and second ridges 130234.doc 200912197 lines is such that the widths of the spaces between the individual x-ray source images are substantially the same. 5. The illumination device of claim 1, wherein the first direction and the second direction are orthogonal or substantially positive to each other, and the first ridge line is at an angle to the first direction, defined as Θ1, and 忒The angle between the second ridge line and the second direction is defined as Θ2, which satisfies the following expression: 10°<θ1<4〇°1Ο°<θ2<4〇0. 6. The illumination device of claim 1, wherein the first direction and the second direction are orthogonal or substantially orthogonal to each other, and the angle between the first ridge line and the first direction... and the second ridge line The angle Θ2 with the second direction satisfies the following expression: θ 1 =02===25〇. The illumination device of claim 2, further comprising one or two brightness enhancement films disposed on opposite sides of the optical sheet of the point light sources, wherein the 5 Xuan Zang enhancement film comprises a plurality of columnar prisms It extends in a predetermined direction and is arranged in parallel. 8. The illumination device of claim 7, which comprises the two brightness enhancement films, wherein the height enhancement film is disposed such that the extension directions of the individual turns intersect each other. 130234.doc 200912197 9 A display element comprising: a panel driven according to an image signal; a plurality of point sources disposed in an area facing the panel; and an optical sheet disposed on the panel Between the plurality of point light sources, wherein the plurality of point light sources are placed in a first __彳 direction and also in a second direction intersecting the first direction, and the optical sheet has a three-dimensional group State, which is included in the intersection of the first and the second direction - the construction of the twenty-seventh. The younger one of the first ridges extending in the direction, and the first, second and third + and - Two ridges in one direction of the direction of the father. Τ Τ Ι〇 Ι〇 一种 一种 一种 一种 一种 一种 一种 一种 一种 一种 一种 一种 一种 一种 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学. The optical crucible has a three-dimensional configuration, and the intersection of the extension direction of the second example is included in the cutter and the first line, and one of the extensions on the virtual angle - the first and the second side The extension of the line is extended by the direction of the extension and the direction of the intersection of the extension direction ◎ the first - the upper L - the second ridge line. I30234.doc