TW201043081A - EL panel, illuminating device with EL panel, backlight for liquid crystal and display device - Google Patents

Abstract

Light extraction efficiency and brightness are high and an uniform illumination is performed. An EL element 11 provided with a light-emitting medium layer 18 sandwiched by an anode electrode 17 and a cathode electrode 16 is arranged on one face of a transparent substrate 15B. An optical sheet 12 is fixed on a face opposite to the EL element 11 of the transparent substrate 15B. The optical sheet 12 is provided with a plurality of unit protrusions 20 having refractive index n on a face opposite to the EL element of base layer 19. The unit protrusion 20 is a shape of semi-ellipsoid in which a cross section apart from a base face, parallel to the base face and most distant from the base face is as a top portion. Setting the diameter of the base face of the unit protrusion 20 as Di, the height between the base face and the top portion as Ti, and defining ARi (the aspect ratio of the unit protrusion 20) = Ti/Di. Meet the requirement of 0.4 ≤ ARa ≤ 0.6...(1) and 1.44 ≤ n ≤ 1.7...(2), wherein ARa is the average of the aspect ratio of a plurality of the unit protrusions.

Description

201043081 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to an EL element (electroluminescence element) used in a liquid crystal backlight, a liquid crystal display device, an illumination device, an electric appliance, a light source, and the like. And an illumination device using the EL element, a backlight for liquid crystal, and a display device. [Prior Art] In general, an EL element has a hole injection layer, a hole transport layer, an interlayer layer, a light-emitting layer, an electron transport layer, and an electron injection layer sandwiched between an anode and a cathode on a light-transmitting substrate. structure. The EL element applies a DC voltage to the anode and the cathode in the above configuration, injects electrons and holes into the light-emitting layer, and recombines them, thereby generating an exciton, and utilizing the light emitted when the exciton fails, To achieve the light. Conventionally, when the light emitted from the light-emitting layer is emitted from the light-transmitting substrate on the light-emitting side surface of the EL element, part of the light is totally reflected on the surface of the light-transmitting substrate on the observation side, and is externally taken out. The problem of light loss is 〇 〇 In this case, the light extraction efficiency of the amount of light taken out externally is generally considered to be about 20%. Therefore, there is a problem that the display of higher brightness and the need to increase the amount of input power are required. In this case, since a large current flows to the element, the load of the element increases, causing a decrease in brightness and a low life, and the reliability of the element itself is lowered. Therefore, in order to improve the light extraction efficiency of the amount of light emitted from the EL element to the outside, an invention has been proposed which is formed by forming a fine concave on the observer-side surface of the light-transmitting substrate provided on the light-emitting surface side of the EL element. .201043081 The light that has been totally reflected on the surface of the light-transmitting substrate and lost as light is taken out to the outside. As such a fine unevenness formed on the side surface of the observation substrate of the light-transmitting substrate, for example, a dome-shaped lens is disposed. - However, in a translucent substrate using a dome-shaped lens, the luminance distribution differs depending on the direction in which the light emitted from the luminescent layer is emitted, and the entire illumination cannot be uniform. Therefore, as shown in FIG. 38, for example, as shown in FIG. 38, the plurality of microlens elements are arranged in a planar manner by the surface 0 on the light-emitting side of the light-transmitting substrate 100. The microlens array 102 of 101 makes the light extraction efficiency more uniform to achieve uniform illumination. [PRIOR ART DOCUMENT] [Patent Document 1] JP-A-2002-260845. SUMMARY OF THE INVENTION [Problems to be Solved by the Invention] However, the EL panel of the above-described prior art is derived from an EL element. The light extraction efficiency is not high enough. Light extraction efficiency in EL elements, and concave and convex shapes

U or its configuration is closely related, and in order to improve light extraction efficiency, these parameters need to be optimized. Further, in the case where an organic EL is used for lighting purposes, in addition to the above-described light extraction efficiency, creativity is also an important factor. In the case where the organic EL element is imparted with creativity, it is common to use a crepe paper or a embossed sheet having a pattern to cover the light source to impart creativity. However, in this method, since the light source is covered with Japanese paper or an acrylic plate having a pattern, the light is lost when the light is absorbed by the Japanese paper or the acrylic sheet, and the light utilization efficiency is obtained. reduce. Therefore, a method of imparting creativity that does not reduce the efficiency of light utilization is required. The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide an EL panel suitable for use as an illumination source and a lighting device having such an EL panel, which has high light extraction efficiency and no sharp change in brightness in the observation direction. Backlight and display device. Further, an object of the present invention is to provide an EL element which is excellent in external extraction efficiency of light, and which is capable of reducing the efficiency of use of light, and an illumination device, a display device and a liquid crystal display device using the same. [Means for Solving the Problem] In order to achieve the object, the present invention has been made as follows. In other words, the EL panel of the present invention includes a light-transmitting substrate, and the EL element includes a light-emitting medium layer provided on one surface of the light-transmitting substrate and sandwiched between the anode and the cathode, and an optical sheet. The light transmissive substrate is disposed on a surface opposite to the EL element; the EL panel is characterized in that the optical sheet is in the

q The surface of the opposite side of the EL element is provided with a plurality of unit convex portions having a refractive index η. These unit convex portions are smaller in cross-sectional area of a cross section parallel to the bottom surface of the unit convex portion from the bottom surface of the unit convex portion toward the top portion. The section farthest from the bottom surface is defined as the top, and the diameter of the bottom surface of the unit convex portion is set to Di, and the length from the bottom surface to the top portion is defined as the height Ti of the unit convex portion, and the aspect ratio of the unit convex portion is defined as ARi = Ti/Di is a case where the average 値 of the plurality of unit convex portions is set to ARa, and satisfies the relationship of 0.4SARaS0.6(1) and 1.44SnS' 1.7 (2). According to the present invention, a plurality of unit convex portions constituting, for example, a microlens or a 稜鏡 lens are disposed on the exit surface of the 201043081 optical sheet provided from the light emitting direction of the EL element, by the aspect ratio of the unit convex portion The average 値ARa is set to the range of the formula (1), and the refractive index of the unit convex portion is set to the range of the (2)-th., so that the amount of light extraction can be increased while the brightness can be increased. In particular, by setting the average 値ARa of the aspect ratio of the unit convex portion to the range of the formula (1), although the aspect ratio ARa gradually increases from 0.1, the amount of light extraction gradually increases, but since 0.4 or more Since the amount of light extraction is substantially the same, the aspect ratio of ARa is 0.4 or more, and sufficient light can be taken out. Further, although the aspect ratio ARa 0 is higher, the relative brightness is higher, but since the aspect ratio ARa is larger than 0.6, the brightness does not rise. Therefore, the aspect ratio ARa of the unit convex portion is set to 0.6 or less. Further, by setting the refractive index η of the unit convex portion to the range of the formula (2), if the refractive index η of the unit convex portion is from 1.44 to 1.7. Range, light • The amount of removal includes the maximum amount of light and the amount of light taken out within 95% of it. On the other hand, if the refractive index η of the unit convex portion is less than 1.44, the light totally reflected on the incident surface of the optical sheet increases, and the amount of light extraction decreases. Further, in the case where the refractive index η is larger than 1.7, since the light reflected on the light incident surface of the optical sheet is increased by Q, the amount of light extraction is lowered. Further, the EL panel of the present invention is characterized in that the distance between the tops of the adjacent two unit convex portions is Β12, and the diameters of the bottom surfaces of the adjacent two unit convex portions are each set to Di, D ( When i+1), the following formula (3) is satisfied,

Di + D(i+l)S B12 (3) At the same time, when the top of the convex portion connected to any unit and the other two unit convex portions located closest to the top are formed, the virtual acute triangle is formed. When the shortest side is set to E1 and the longest side is set to E2, the relationship of the following formula (4) is satisfied, .201043081 1 ^ E2/E1 ^ 2 If the EL panel according to the present invention's adjacent unit convex portions are not mutually Will overlap - the reduction of the area of light emitted by the unit convex. Further, since the configuration is such that the phase (3) is included in the phase i, since the unit convex portion 包含 is included, the light extraction amount and the luminance 0 can be made within 1%, so that the unit is located in the equation (3). And within the range of (4) and brightness. Further, the bottom surface of the unit convex portion can also be: ^ By using the bottom surface of the unit convex portion as a unit convex portion, the single sheet in the optical sheet can contribute to an increase in the amount of light extraction and brightness. a feature Q creative piece; the light control creative film system is disposed at intervals with the EL portion, and is embedded in the unit convex portion and each has a height ratio to form a creative pattern than the unit convex portion column, and the creative pattern is formed Concave and convex arrangement patterns. In order to improve the external extraction efficiency of light, and to arrange the unit convex portions with no gaps therebetween, it is not lowered (4). According to the formula (3), the maximum amount of the light extraction amount and the brightness which are satisfied by the three unit convex portions of the luminance portion can be suppressed because the light extraction amount and the three unit convex portions of the luminance portion are suppressed from being generated. The positional relationship between the convex portions and the convex portions is set such that the light extraction amount that can be kept sufficiently high is circular. In a circular shape, the installation area of the plurality of convex portions is closely arranged, and the optical sheet of the present invention is controlled by light; a plurality of unit convex portions are attached; the opposite side of the member; and a plurality of The arrangement between the concavities and convexities is arranged without gaps, and the arrangement of the rows of the convex portions of the unit convex portion forms a substantially fixed pattern of the unit convex portion, and the utilization efficiency of the low-light portion of the uneven portion of the external light extraction efficiency is And can help 201043081 to be creative. Further, an EL panel is characterized in that the light control creative sheet of the present invention is characterized in that light emitted from the light-emitting medium layer is emitted as the first light emitted by the unit convex portion* from the light. When the light emitted by the layer is the second emitted light that is emitted by the uneven portion, the first emitted light and the second emitted light are compared, and the emission direction and the luminance distribution of the first emitted light and the second emitted light are compared. At least one of them is different. The first emission light of the light emitted from the unit convex portion for improving the external light extraction efficiency, and the emission direction of the second emission light of the light emitted from the uneven portion for improving the external extraction efficiency of light, or the difference in luminance distribution Give creativity without reducing the efficiency of light utilization and giving creativity. Moreover, the inclination angle formed by the inclined surface of the unit convex portion and the bottom surface may be different from the inclination angle of the end portion of the unit convex portion and the inclination angle of the other end portion of the unit convex portion. . By giving different tilt angles and changing the viewing position, different visual effects can be imparted and can be creative. Further, the uneven portion has a convex lens or a dome shape, and has a strip shape extending in one direction, and the strip-shaped convex lens or dome shape is mutually between the unit convex portions. Arrangement in parallel is preferred. Further, the uneven portion has a convex lens or a 稜鏡 shape, and has a strip shape extending in one direction, and the strip-shaped convex lens or 稜鏡 shape crosses each other between the unit convex portions. The arrangement of the ground is preferred. Further, it is preferable that the uneven portion is provided with a polygonal convex lens portion having a polygonal bottom portion or a polygonal concave lens portion having a polygonal bottom portion without a gap. Further, it is preferable that the creative pattern is formed by using a difference in density indicated by the number of arrangement of the unit convex surface per unit surface 201043081. Further, according to the illuminating device of the present invention, by using the EL panel described above, it is possible to obtain a higher light extraction amount and brightness than the conventional illuminating device. In the same manner, according to the backlight for liquid crystal of the present invention, by providing the EL panel described above, it is possible to obtain a higher light extraction amount and brightness than in the related art. Further, in the liquid crystal display device of the present invention, by providing the liquid crystal backlight and the liquid crystal display element described above, a liquid crystal display image having a high light extraction amount and high luminance can be obtained. Further, according to the display device of the present invention, the EL panel is driven by the above-described EL panel, whereby a display device having a high light extraction amount and high luminance can be obtained. [Effects of the Invention] According to the EL panel of the present invention, a plurality of unit convex portions are disposed on the emitting surface of the optical sheet provided in the light emitting direction from the EL element, and the aspect ratio of the unit convex portion is set. Since the average 値ARa is set in the range of the formula (1) and the refractive index of the unit convex portion is set in the range of the formula (2), the light extraction efficiency can be improved, and the amount of light extraction can be increased while the brightness is improved. In particular, the maximum light extraction amount can be obtained by setting the average 値ARa of the aspect ratio of the unit convex portion to the range of the formula (1), and by setting the aspect ratio AR to 0.4 or more. Sufficient light, and by setting the aspect ratio ARa to 〇·6 or less, the cost and the occupied volume are suppressed to a minimum, and high luminance can be obtained. Further, by setting the refractive index η of the unit convex portion to a range from 1.44 to 1.7 defined by the formula (2), the light extraction amount includes the maximum enthalpy and the light extraction amount within 95% can be obtained. Further, 'the creative pattern is applied to the unit convex portion for improving the external extraction efficiency of the light, and the uneven portion is provided with no gap between the unit convex portions to improve the external extraction efficiency of the light, thereby not reducing the uneven portion. The efficiency of light utilization can contribute to creativity. In addition, the first emission light of the light emitted from the unit convex portion of the external light extraction efficiency, and the emission direction of the second emission light of the emission light of the uneven portion which improves the external extraction efficiency of the light, or the brightness The difference in distribution gives creativity without reducing the efficiency of light utilization and giving creativity. Further, by using the illumination device, the display device, and the liquid crystal display device incorporating the EL element of the present invention, it is possible to provide a high light extraction amount and high luminance, and the light utilization efficiency is not lowered, and the creative illumination is provided. Device, display device and liquid crystal display device. [Embodiment] [Embodiment for Carrying Out the Invention] (First Embodiment) Hereinafter, an EL panel according to an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a longitudinal cross-sectional view showing a configuration of a Q panel of an EL panel 10 according to a first embodiment of the present invention. The EL panel 10 shown in Fig. 1 integrally fixes the optical sheet 12 to the light-emitting surface of the surface of the EL element 11 in the light extraction direction via the adhesive layer 13, and the EL element 11 in the EL panel 10 is to be the cathode 16. The light-emitting medium layer 18 sandwiched between the anode 17 and the anode 17 is formed between the substrate 15A and the transparent substrate 15B of the light-transmitting substrate. The cathode 16 is disposed adjacent to the substrate 15 A and the anode 17 is disposed adjacent to the transparent substrate 15B. Here, the EL element 11 is an element having a function of emitting light, and a light is applied from the light-emitting medium layer 18 by applying a voltage to the anode 17 and the cathode 16 by -11-201043081. The emitted light hi passes through the anode 17, passes through the transparent substrate 1B and the adhesive layer 13, and then enters the incident surface 12a of the optical sheet 12. The optical sheet 12 is formed of a sheet-like base material layer 19 and a plurality of unit convex portions 20 formed on the emission surface 12b at predetermined intervals. The unit convex portion 20 is, for example, a microlens constituting the optical sheet 12, and is formed in a substantially circular shape in plan view and has a substantially semi-ellipsoidal shape of an elliptical shape of substantially 1 /2 in a side view, preferably a semi-rotation ellipse. Body shape. Therefore, a part of the emitted light hi incident from the incident surface 12a of the optical sheet 12 passes through the base material layer 19, and is condensed and diffused by the plurality of unit convex portions 20 formed on the emitting surface 12b, and then emitted as light hla. . In the region 12ba of the exit surface 12b of the optical sheet 12 where the unit convex portion 20 is not formed, the emitted light hi is directly transmitted. Further, a part of the emitted light hi is the light hlb reflected on the outermost surface 20A of the emitting surface on the unit convex portion 20. The light-emitting medium layer 18 shown in Fig. 2 is disposed between the cathode 16 and the anode 17, and is preferably constituted by a structure including the light-emitting layer 21 and the hole transport layer 22. Further, an electron injecting layer (not shown), a charge blocking layer (not shown), and a layer (not shown) functioning as an electron transporting layer may be provided in the above-described light emitting medium layer 18 as needed. The layer between the anode 17 and the light-emitting layer 21 is a hole injection layer (not shown), an electron blocking layer (not shown), and a hole transport layer 22, and is formed between the light-emitting layer 21 and the cathode 16. A hole barrier layer (not shown), an electron injection layer (not shown), and an electron transport layer (not shown). These may also be laminated in a plurality of layers, and may be formed into one layer having two or more functions. The electron injecting layer, the electron blocking layer, and the electron transporting layer are as described later. -12- 201043081 Although the lamination method can be appropriately selected for each of the materials to be blended, thermal stability can be obtained by specifically selecting a material composed of an inorganic material. A more stable EL element 11 excellent in resistance. The optical sheet 12 that condenses, diffuses, and transmits the light hi emitted from the EL element 11 will be further described. The luminance distribution of the light emitted from the EL element 11 depends on the shape and arrangement of the unit convex portion 20 forming the outermost surface 20A of the optical sheet 12. In the EL panel 10 shown in Fig. 1, the unit 0 convex portion 20 provided in the optical sheet 12 is formed into a substantially semi-ellipsoidal shape, but the unit convex portion 20 is not limited to such a shape. Next, a suitable shape of the unit convex portion 20 will be described. First, the optical sheet 12 shown in Fig. 3(a) is a first reference example. The unit convex portion 23 having a shape different from the unit convex portion 20 having a substantially semi-ellipsoidal shape is arranged at a predetermined interval. The exit surface 1 2b of the material layer 19. The unit convex portion 23 shown in Fig. 3(a) is formed in a polygonal columnar shape of, for example, a regular hexagonal column shape. The emitted light emitted from the unit convex portion 23 has a luminance distribution 310 as shown in Fig. 3(b) and Q. In other words, in the third diagram (a), the emission angles 0 of the emitted light hla in the normal (center axis) direction N of the top surface 23a of the unit convex portion 23 of the EL panel 10 are the same, As shown in Fig. 3(b), the direction 314 in which the brightness is high and the direction 316 in which the brightness is low are generated in accordance with the emission direction of the emitted light hla, and the brightness is drastically changed depending on the angle of the direction of the observation. This is because even if the angle 0 of the light emission hla of the normal line N of the unit convex portion 23 is the same, since the unit convex portion 23 has a hexagonal column shape, the light emitted from the top surface 23a and the light emitted from the top surface 23a are deviated from the top surface 23a. The light hla is emitted. -13- 201043081 Thus, as shown in the second reference example of Fig. 4(a), the unit convex portion 24 is preferably such that its bottom surface 24c is circular. The case where the bottom surface 24c of the unit convex portion 24 is a circular shape is as shown in the luminance distribution 310' of the emitted light hla shown in Fig. 4(b) as long as the light is emitted at the same angle 0 to the normal line. You can get the brightness of the average sentence. Further, as shown in Fig. 4(a), when the unit convex portion 24 formed on the emitting surface 12b of the optical sheet 12 is a cylinder, the luminance distribution shown in Fig. 4(b) can be obtained. 310. In this case, it is preferable that a large amount of the emitted light hla is emitted from the 0 side surface 24b of the unit convex portion 24 toward the vertical direction of the EL panel 10. On the other hand, the emitted light hla emitted from the top portion 24a is emitted in the horizontal direction, and light loss occurs. On the other hand, as shown in the third reference example of Fig. 5(a), the shape of the single convex portion 25 is a conical shape which is tapered under the circular shape of the bottom surface 25c. The side surface 25b of the unit convex portion 25 shown in Fig. (a) emits light hla, but as shown in Fig. 5(b), a large amount of emitted light is emitted not only in the vertical direction of the EL panel 10 but also in the horizontal direction. , q Since the luminance of the central region of the unit convex portion 25 is larger than that of the basin-shaped luminance distribution 310 which is recessed outside, light loss occurs. Further, as shown in the fourth reference example of Fig. 6(a), when the shape of the unit convex portion 26 is a truncated cone shape, the side surface 26b formed around the top surface 26a of the unit convex portion 26 is emitted. The emitted light hla is emitted at a nearly vertical angle, and although a lot of light hla emitted from the top surface 26a is emitted in the vertical direction, it is less likely to be emitted in the horizontal direction. Therefore, as shown in Fig. 6(b), the emitted light hla emitted from the unit convex portion 26 can be made to increase the luminance distribution 310 in the vertical direction. -14- 201043081 However, even in the unit convex portion 26 having such a truncated cone shape, the luminance distribution 310 shown in Fig. 6(b) remains at a sharp angle "degree" in the peripheral portion. Therefore, as the shape of the unit convex portion 27 shown in the fifth reference example, a substantially hemispherical convex curved surface formed by a smooth curved surface as shown in Fig. 7(a) is used, and the unit convex is used. As shown in Fig. 7(b), the luminance distribution in the vertical direction of the emitted light hla emitted from the portion 27 is not drastically changed by the angle of observation, and an overall gentle luminance distribution can be obtained. This 0 brightness distribution is better. However, even if the shape of the unit convex portion 27 is not a convex curved surface as shown in Fig. 7(a), any inclined curved surface may be used. In other words, when the diameter of the bottom surface 27c of the unit convex portion 27 is Di and the height from the bottom surface 27c of the unit convex portion 27 to the apex 27a is Ti, the aspect ratio ARi can be expressed as follows (5). get. ARi = Ti / Di (5) According to the case where the aspect ratio ARi of the unit convex portion 27 of the formula (5) is, for example, less than 0.4, the height Ti as shown in Fig. 8(a) is much smaller than the diameter Di Q. The unit convex portion 28 of the convex curved shape. In the unit convex portion 28, the emitted light hla transmitted through the light emitted from the unit convex portion 28 is relatively small, and the total reflected light hlb is increased. Therefore, as shown in Fig. 8(b), the peak 値 of the luminance distribution of the emitted light hla emitted from the unit convex portion 28 becomes small, and the total amount of light extraction is reduced, which causes a poor luminance reduction.

On the other hand, as shown in Fig. 9(a), the unit convex portion 20 has a substantially semi-ellipsoidal shape, and the aspect ratio ARi shown in the formula (5) is, for example, 0.4 or more and is sufficiently large to be incident on the unit convex. The light hlb totally reflected in the emitted light hi of the portion 20 is small, and as shown in Fig. 9(b), the brightness at the top of the center (center axis N -15-201043081) 20a is sufficiently high and does not follow the periphery. The brightness changes drastically, while exhibiting a slowly decreasing brightness distribution. Such a unit convex portion 20' is preferable because sufficient light can be taken out from the emitted light hi emitted from the EL element 9. Therefore, the unit convex portion 20 of the optical sheet 12 shown in Fig. 9 is preferably a substantially semi-ellipsoid lens shape. Next, the refractive index η of the unit convex portion 20 will be described. In the case where the refractive index η of the unit convex portion 20 provided in the optical sheet 12 is too low, since the light hi totally reflected on the incident surface 12a of the optical sheet 12 increases, it reaches the light exiting surface 12b of the optical sheet 12. The light is reduced, so the amount of light extraction is reduced. On the other hand, in the case where the refractive index η is too high, in the boundary between the optical sheet 12 and the transparent substrate 15 , the light reflected on the incident surface 12 a of the optical sheet 12 increases, and reaches the exit surface 1 2 b of the optical sheet 12 . The reduction, so the amount of light extraction is reduced. Next, the relationship between the refractive index η and the width & height ratio ARi of the unit convex portion 20 and the light extraction amount from the unit convex portion 20 will be described based on Fig. 10 . Further, in the present specification including FIGS. 10 and 17, the light extraction amount is based on the light extraction amount of the portion of the flat optical sheet 12 on which the unit convex portion 20 is not provided, and the unit convex portion 20 is to be provided, and The ratio of the light extraction amount of the unit convex portion 20 is expressed as " in Fig. 10, the aspect ratio ARi of the unit convex portion 20 is set at intervals of 0.1 to 0.7, and the refractive index η of the unit convex portion 20 is taken on the horizontal axis. The ratio of the light extraction amount from the optical sheet 12 is taken in the longitudinal direction, thereby indicating the relationship between the refractive index η of the unit convex portion 20 and the amount of light extraction. According to Fig.-16-201043081 shown in Fig. 10, although the ARY increases gradually from 〇.丨, the amount of light extraction gradually increases, but when the aspect ratio ARi is 〇.4 or more, the light is taken out. The amount is roughly the same 'will not increase. Therefore, it can be confirmed that as long as the aspect ratio ARi is 0.4 or more, * sufficient light can be taken out. Further, Fig. 11 shows the relationship between the refractive index η of the unit convex portion 20 and the aspect ratio ARi and the relative luminance of the unit convex portion 20. Further, in the patent specification including the first diagram and the seventh embodiment, the relative brightness is based on the luminance of a portion of the optical sheet 12 on which the unit convex portion 20 is not provided, and the unit convex portion 20 is to be set, 0 and unit convex. The ratio of the brightness of the portion 20 is expressed. Although the relative brightness ratio is higher and the ARi is larger, the brightness is not increased when the aspect ratio ARi is greater than 0.6. Therefore, in consideration of the suppression cost and the occupied volume, the aspect ratio ARi of the unit convex portion 20 is preferably 0.6 or less. Therefore, it is preferable that _ satisfies the following formula (1). 0.4 ^ ARa ^ 0.6 (1) Further, in Fig. 1.0, when the refractive index η of the unit convex portion 20 is 1.58, the amount of light extraction becomes maximum. Further, when the refractive index η of the unit convex portion 20 is in the range of q from 1.44 to 1.7, since the light extraction amount becomes 95% or more of the maximum 値, the refractive index η of the unit convex portion 20 is preferably satisfied as follows (2) ). 1.44^ η ^ 1.7 (2) Further, the base material layer 19 is preferably made of the same material as the unit convex portion 20 and has the same refractive index η. Next, a preferred arrangement configuration of the unit convex portion 20 will be described. The arrangement pattern of the unit convex portions 20 in the optical sheet 12 may be, for example, a lattice-like arrangement as shown in Fig. 12(a). In Fig. 12(a), a plurality of unit convex portions 20 are arranged in a lattice shape on a substantially square-shaped base material layer 179 of -17-201043081 with a fine gap therebetween. * In addition to the arrangement of such unit convex portions 20, a honeycomb arrangement as shown in Fig. 22 (b), such as a periodic strip as shown in Fig. 22 (c), may be employed. Arranged, or randomly arranged as shown in Fig. 12(d). If the arrangement of the unit convex portions 20 on the plane of the base material layer 19 is periodic, the arrangement density of the unit convex portions 20 can be easily increased, and the amount of light extraction can be increased. On the other hand, if the arrangement Q state of the unit convex portion 20 on the base material layer 19 is not periodic, no moire will occur. For example, in the case where the pixel pattern is provided on the EL panel 10, it is preferable to prevent the pattern generated by the arrangement pattern of the unit convex portion 20 and the interference of the pixel pattern of the EL panel 10.

Further, in the case of using the EL panel 10 having the above-described optical sheet 12 for illumination purposes, in order to add creativity, an appropriate trademark can be formed by making the arrangement of the unit convex portions 20 on the optical sheet 12 dense. Marks or patterns, etc. For example, as shown in Fig. 13 (a) or (b), when the unit convex portion Q is arranged, a T-shaped trademark or a symbol including X can be obtained. Further, as shown in Fig. 13(c), when the unit convex portions 20 are arranged, they can be arranged in a shape such as a proper pattern. However, as shown in Fig. 14, in the case where the adjacent unit convex portions 20, 20 are partially overlapped on the base material layer 19 of the optical sheet 12, " because the adjacent unit convex portion is formed Since the joint side portions 20s of the 20 and 20 are not emitting sufficient light, the luminance of the emitted light hi a emitted from the unit convex portion 20 is lowered. Therefore, the straight -18-201043081 diameters of the respective bottom surfaces 20c of the adjacent unit convex portions 20, 20 are set to Di, D(i + 1), and the tops of the adjacent two unit convex portions 20, 20 are When the distance between 20a and 20a is B12, it is preferable to adopt a configuration that satisfies the following formula (3). Thereby, it is possible to arrange that the adjacent unit convex portions 20, 20' do not overlap (refer to Fig. 16).

Di/2 + D(i + l) / 2 ^ B12 (3) However, as for the arrangement of the unit convex portion 20 described above with respect to the base material layer 19, as shown in Fig. 15, a plurality of unit convex portions 20 are formed. Each of them is disposed in the vicinity of the opposite corners of the base material layer 19, for example, on the diagonal line, because the arrangement of the single-position convex portion 20 is extremely biased, so that the brightness is biased, and the light cannot be taken out. Area. In such an arrangement of the unit convex portions 20, as a result, the overall brightness and the amount of light extraction are lowered. Therefore, as shown in Fig. 16, in order to investigate the relationship between the light extraction amount and the alignment bias of the unit convex portion 20, three unit convex portions 20 adjacent to each other are arbitrarily selected, and virtually formed by connecting each An acute angle triangle S formed by the apex 20a (top) of the unit convex portion 20. When the shortest side (interval) of the acute-angled triangle S connecting these vertices 20a is set to the short side E1 and the longest side (interval) 〇 is set to the long side E2, the 取出 of E2/E1 is used as an index, and the light extraction amount and relative brightness are reviewed. Change. However, the luminance distribution of the EL panel 10 is based on the luminance distribution according to the Lambert source surface. As a result, as shown in Fig. 17 (a), if the long side E2 is twice or less of the short side E1, the amount of light extraction is maximized and the change in the amount of light extraction is within 1%. _ ' As shown in Fig. 7 (b), as for brightness, it is also known that if the ratio of the long side E2 to the short side E 1 is 2 times or less, the relative brightness includes the maximum relative brightness while varying at the maximum relative brightness. Within 1%. Therefore, it is preferable that the long side -19-201043081 E2 is twice or less the short side El. Further, the definition "from the sides El, E2" is E1SE2. Therefore, the following formula (4) holds. ' 1 ^ E2 / E1 ^ 2 (4) v Therefore, by arranging the unit convex portion 20 as described above, since a sufficient light extraction amount and brightness can be obtained, it is preferable. However, in the case of producing the optical sheet 12, even if, for example, the unit surface convex portion 20 of the same shape and the same size is formed by arranging the emission surface 12b of the base material layer 19 of the quadrangular film shape at predetermined intervals, The single-position convex portion 20 includes an error in molding, and in the case where the mold of the unit convex portion 20 is formed by etching, the size or shape of the unit convex portion 20 is minutely changed due to the etching time, the etching temperature, and the like. Further, although the arrangement of the unit convex portions 20 does not fluctuate at the time of production, when the particles are dispersed to form ^, the design may be deviated from the design. Therefore, in the optical sheet 12 manufactured according to the design, the shape and arrangement of the unit convex portion 20 are measured by three-dimensional shape measurement by a laser microscope. (Fig. 18(a) and (b) are three-dimensional shapes of arbitrary unit convex portions 20 of the optical sheet 12 obtained by measurement by a laser microscope. From this three-dimensional shape, the boundary B0 of the unit convex portion 20 at the bottom surface 20c is obtained. In the case where the bottom surface 20c of the unit convex portion 20 has a substantially circular shape, a circle conforming to the boundary B0 can be used as the bottom surface 20c of the unit convex portion 20 (step 1). From the area Si of the bottom surface 20c obtained by the measurement, the diameter Di of the unit convex portion 20 is obtained by the following equation (6).

Di = v^ (4Si / π ) (6) Next, the apex 20a of the unit convex portion 20 is taken as the center point (top) which is farthest from the bottom surface 20c -20- 201043081', and is obtained from the distance from the bottom surface 20c to the apex 20a. The height of the unit convex portion 20 is Ti, and the aspect ratio ARi = Ti/Di is obtained. Further, the diameters D1 and D2 of the bottom surfaces 20c of the adjacent two unit convex portions 20 and 20 and the distance B12 between the two vertices 20a and 20aa are obtained, and whether or not the equation (3) is satisfied is calculated. . Further, in Fig. 16, the apex 20a of the other unit convex portion 20 adjacent to the above-described two unit convex portions 20, 20 is a virtual acute triangle which connects the three vertices 20a as the top, and the shortest side ( The interval is set to E1, and the longest side (interval) is set to E2, and it is calculated whether or not the full value is (4) (step 2). Then, moving between the observation areas of the plurality of unit convex portions 20 in the optical sheet 12, the processing from the step 1 to the step 2 is repeated, and the equations (3) and (4) which are obtained in the step 2 are satisfied. The diameter Di, the height Ti, and the aspect ratio ARi of each unit convex portion 20 of the formula are determined to be 10 or more and 30 or less in total of the measured unit convex portions 20. Next, from these data, the average 値ARa of the aspect ratio ARi of the single convex portion 20 is obtained (step 3). Further, the refractive index n of the q-unit convex portion 20 is obtained by the B method of the method for determining the refractive index of the plastic of JIS K7 142 (step 4). By the above-described steps 1 to 4, it is judged whether or not the optical sheet 12 satisfies the following formulas (1) to (4) of the above-described conditions of the shape and arrangement of the unit convex portion 20. 0.4 ^ ARa ^ 0.6 (1) 1.44 ^ η ^ 1 • 7 ... (2) Di/2 + D(i+l)/2 ^ B12 (3) 1^ E2/E1^ 2 (4) If these are When the unit convex portion 20 satisfies the above formulas (1) to (4), it can be said that the optical sheet 12 is a unit having an embodiment of the present invention in which the above-described high light extraction amount and high luminance are obtained. The optical sheet 1 2 of the convex portion 20 is not necessarily the same in shape and arrangement of the unit convex portion 20 satisfying the above formulas (1) to (4), and may be arranged in a size as shown in Fig. 19 or The unit convex portions 20' having different shapes may also be applied to the above formulas (1) to (4). In particular, as shown in Fig. 19, the unit convex portion 20 having a small diameter Di may be disposed in a gap of the unit convex portion 20 having a large diameter Di.

In this case, the reflected light hlb reflected on the outermost surface 20A of each unit convex portion 20 and returned to the EL element 11 side can be reduced. Therefore, it is more preferable because the result can increase the emitted light hla emitted from the outermost surface 20A. (Second Embodiment) As a second embodiment of the present invention, as shown in Fig. 20, the uneven portion 30 may be provided in a region 12ba between the unit convex portions 20 and 20 where the unit convex portion 20 is not formed. By forming the uneven portion 30, the same as the configuration in which the unit convex portion 20 having a small size shown in Fig. 19 is disposed in the gap of the unit convex portion 20 having a large size, the maximum of the unit convex portion 20 can be reduced. Light h 1 b reflected by surface 20A. As a result, it is preferable because the light hla emitted from the outermost surface 20A can be increased. Further, the uneven portion 30 is disposed in the region 12ba outside the unit convex portion 20 without a gap, and the reflected light hlb can be reduced. Thereby, more light can be taken out. As shown in an example of Fig. 20, for example, a surface of the sheet-shaped light-transmitting substrate layer 19, that is, a surface in the irradiation direction F (this surface is referred to as a surface) 8a, for example, as a unit convex portion 20 The hemispherical microlenses are dispersed in a portion of the region to form a plurality of. As a substantially columnar convex member that extends in the one-dimensional direction, for example, -22-201043081 is buried in the gap of the unit convex portion 20, for example, a plurality of triangular prism-shaped 稜鏡 lenses are arranged in the same direction as the uneven portion 30. And formed in the entire area of the surface 8a, the microlens of the unit convex portion 20 is formed to overlap with a part of the pupil lens of the uneven portion 30. In Fig. 20, the unit convex portion 20 has a diameter of contact with the surface 8a of the base material layer 19 as PM, and a height based on the surface 8a of the base material layer 19 is referred to as TM. Further, the uneven portion 30 has a width of the bottom portion in contact with the surface 8a as PL, a height from the surface 8a to the top portion is TM, and a vertex angle is set to 0 T. The unit convex portion 20 constitutes a microlens shape, is regularly arranged at a plurality of equal intervals, or is irregularly arranged without being spaced apart. The shape of the unit convex portion 20 is a substantially semicircular spherical shape and a substantially elliptical spherical shape. Further, in order to more efficiently deflect the light B1 incident on the unit convex portion 20 and improve the external extraction efficiency of the light of the EL panel 10, the aspect ratio TM/PM of the height TM and the diameter (width) PM is preferably 40% or more. This is because the aspect ratio TM/PM of the height TM and the diameter (width) PM is 40% or more, q, in order to deflect the light B1 in the irradiation direction F, the inclination angle of the slope of the first uneven portion 40 can be sufficient. The size is better. Further, among the widths of one surface of the base material layer 19 of the unit convex portion 20, the longest diameter PM having the longest width is set to be 20 / z m or more and 300 μm or less. When the longest diameter PM is less than 20 μm, the light is scattered in the first uneven portion 40, and the efficiency in which the pupil 1 incident on the unit convex portion 20 is deflected in the irradiation direction F is not preferable. In the case where the longest diameter ΡΜ exceeds 300 /zm, when the shape of the unit convex portion 20 is shaped, since a sufficient unit for obtaining the light B1 incident on the unit convex portion 20 toward the desired aspect ratio is to be obtained. The convex portion 20 is high -23- 201043081 degrees TM forming will become difficult and not good. The distance between the centers of the adjacent unit convex portions 20 is preferably 50 or more and m is 5,000 or more. Then, a plurality of concave and convex portions 30 are provided so as to be buried between the unit convex portions 20 thus arranged. Further, the unit convex portions 20 which are not adjacent to each other with respect to the unit convex portion 20 are in contact with each other, and the uneven portions 30 are arranged in plural in a state in which the unit convex portions 20 are in contact with each other. As shown in Fig. 20(b), it is preferable that the inclination angle 0 degrees 0 ra 1 of one of the unit convex portions 20 and the inclination angle 0 m2 of the other unit convex portion 20 are different. By making the tilt angles different in this way and changing the viewing position as the viewpoint S 1 and the viewpoint S 2 , different visual effects can be imparted and can be creative. For example, as shown in Fig. 20(b), by making the tilt angle 0 m2 larger than the tilt angle Θ ml, as shown in Fig. 20(c), an asymmetrical light distribution is generated, which can be made at the viewpoint S. 1 and the visual effect of the viewpoint S 2 are different. In this case, since the inclination angle Θπι2 is larger than the inclination angle 0 ml, the ratio of the change in the brightness to the change in the direction of the visual field of Q becomes large. As a visual effect in this case, it is possible to contribute to a visual effect in which the brightness of the unit convex portion 20 is different between the viewpoint S 1 and the viewpoint S 2 in the case where the observation position is changed. Further, by changing the inclination angle 0 m2 or the inclination angle 0 m 1 and the difference between the inclination angles of the uneven portions 30, it is possible to change the degree of the brightness change when the viewpoint direction is changed. As shown in Fig. 20 and Fig. 21(a), the uneven portion 30 is formed into a lens or a 稜鏡 shape having a convex shape in cross section, and has a strip shape extending in one direction, and the strip-shaped convex lens or rib The mirror shapes are preferably arranged to be parallel to each other between the unit convex portions - 24 - 201043081 20 . Further, as shown in FIG. 21(b), the uneven portion 30 may have a lens or a 稜鏡 shape having a convex cross section and a belt-like shape extending in one direction, and the strip-shaped convex shape may be formed. The lenses or cymbal shapes are arranged to cross each other between the unit convex portions 20. By this means, the light distribution of the light emitted from the uneven portion 30 toward the irradiation direction F can be adjusted in the two-dimensional direction. Therefore, by making the uneven portion 30 into an arbitrary shape, the light emitted from the concave 'convex portion 30 can be symmetrically distributed, or 0 can be asymmetrically distributed, and creativity can be imparted. As shown in Fig. 22(a), the uneven portion 30 has a first shape 61 which is convex at a predetermined pitch and a direction substantially orthogonal to the first line 61. The second ridge 62 is formed in a convex shape. ^ The cymbals arranged in one direction can be used to control the light distribution in the direction in which the lenses are arranged by the slanting surface of the cymbal. Therefore, in the case where the concavo-convex portions are arranged in a direction in which they are arranged in one direction, the light distribution can be adjusted one-dimensionally. However, in the case where the EL panel Q 1 〇 is used for lighting purposes, it is necessary to adjust the light distribution at least two-dimensionally. For this reason, for example, depending on the installation location of the illumination device, it is possible to increase the brightness in the front direction instead of the wide distribution of light distribution in a certain direction. Alternatively, when the light hi incident on the uneven portion 40 becomes an asymmetric light distribution, and the light distribution of the light emitted from the illumination device is required to be a symmetric light distribution, since only one dimension is used The adjustment of the present invention makes it difficult to adjust the light distribution of the light emitted from the illumination device into a symmetrical distribution of light distribution, so that the configuration of the present invention in which the adjustment in the two-dimensional direction can be realized is preferable. Further, as shown in the configuration of the present invention, in the cross-section of the ?25-201043081 which is arranged substantially orthogonally, in order to develop the light two-dimensionally, it is possible to adjust the light distribution to an appropriate light distribution. Distribution, lighting can also be achieved 'lightweight, thin and low cost. In particular, the light emitted from the luminescent medium layer 18 of Fig. 1 is a wide directional light having a wide light distribution. Therefore, the uneven portion 30 is designed to be biased toward the irradiation direction F by the above-described wide light distribution. Further, it is preferable that the slopes of the first 稜鏡61 and the second 稜鏡62 are made of a linear shape, and the light B1 Q incident on the uneven portion 30 can be deflected in the same direction, so that the light can be condensed in an arbitrary direction. . Further, the shapes of the first 稜鏡 61 and the second 稜鏡 62 may be different. Alternatively, as shown in Fig. 23(a), the uneven portion 30 may be formed in a direction in which the first cylindrical lens 6 1 having a convex shape formed by a predetermined distance and the first cylindrical lens 61 are substantially orthogonal to each other. The shape of the convex - 2 cylindrical lens 62 is formed. The lens lens is arranged in one direction. The lenticular lens sheet can control the light distribution in the arrangement direction of the lens by the light hi of the curved surface uneven portion 30 of the lens. When the lenticular lens sheet is used in the uneven portion 30, the lenticular lens sheet is used. The cloth can be adjusted in one dimension. However, in the case of lighting applications, at least a two-dimensional light distribution is required. For this reason, for example, depending on the arrangement of the illumination device, it is possible to require no illumination in a specific direction, and it is required to increase the frontal aspect instead of the broad distribution of light distribution. Alternatively, in the case where the incident concave-convex portion 'hi becomes an asymmetric light distribution, and the light distribution of the light emitted from the illumination is a symmetric light distribution, the addition of the additional device is preferably [ Linear. In the same direction, there is also a double pair injection in the column of the sum. Therefore, it is difficult to adjust the one-dimensional direction by the -26-201043081, and the configuration of the present invention which is adjustable in the two-dimensional direction is preferable. . Further, according to the configuration of the present invention, the cross lenticular lens sheet in which the cylindrical lenses are arranged substantially orthogonally can be adjusted to an appropriate light distribution without adding a lens sheet in order to develop the light two-dimensionally. Lightweight, thin, and low-cost lighting devices are realized. In particular, the light emitted from the light-emitting layer is light having a wide directivity with a wide distribution of light distribution. Therefore, it is preferable that the uneven portion is designed such that the above-described distribution of the light distribution 0 is wide toward the irradiation direction F. The cross-sectional shape of the first cylindrical lens 61 and the second cylindrical lens 62 is not a completely semicircular (spherical lens), but a so-called non-hemisphere such as a semi-elliptical (elliptical lens) or a parabolic (parabolic lens). The shape (so-called two-dimensional aspherical shape) is further preferably a high-order aspherical shape having a second-order or later term. By using an aspherical lens, the area of the area where the lens side mask is appropriately tilted can be adjusted, and the emitted light can be adjusted more easily than the full semicircular lens. Further, the shapes of the first cylindrical lens 61 and the second cylindrical lens 62 may be the same or different. Further, as shown in Figs. 24 to 29, the uneven portion 30 may be a polygonal pyramidal lens or a polygonal pyramidal lens having a polygonal shape at the bottom of one side of the base material layer 19 without a gap. By arranging without gaps, the flat portion between the uneven portions '30 which does not contribute to the deflection of the light hi incident on the uneven portion 30 can be substantially eliminated, so that the external extraction efficiency of the light of the EL panel 1 can be further improved. Further, since the arrangement is made without a gap, since the fine structure formed by the flat portion is not formed, it is possible to prevent the occurrence of color unevenness due to the diffraction phenomenon of light. As a method of arranging without gaps, the split surface of the uneven portion 30 is made into a regular hexagon (Fig. 25(a)), a square (Fig. 25(b)), and a positive triangle.

The shape (Fig. 25(c)) can be arranged such that the shape of the dividing surface 9 is substantially the same. By making the shape of the split surface 9 substantially the same, since the size and shape of the uneven portion 30 can be made substantially the same, the EL panel 10 in which the in-plane unevenness of the luminance does not occur can be formed, and therefore the surface where the brightness does not occur is required. The case of the EL 0 panel 10 which is uneven inside is preferable. In particular, when the split surface 9 is formed into a regular hexagonal shape, since the shape of the joint portion between the split surfaces 9 is not linear, a more complicated zig-zag shape can be formed, so that the pixel pattern is provided on the EL panel 10. In the case, it is preferable to prevent the embossing due to the interference between the shape of the joint portion of the split faces 9 and the pixel pattern of the EL panel 10. Further, as shown in Fig. 26, the division faces 9 may be arranged without any gaps in the different polygonal combinations. ^ Fig. 29 to Fig. 29 are views showing an example of a case where the uneven portion 30 is formed into a polygonal pyramidal lens or a polygonal pyramidal lens. Fig. 27 is a plan view in which the uneven portion 30 is formed by a quadrangular pyramid having a square face shape and a convex lens shape. In the case where it is required to change the light distribution of the light emitted from the EL panel 10 to the symmetry, it is preferable that the dividing surface 9 be substantially square and the inclination angles of the four inclined surfaces of the quadrangular pyramid lens 52 be substantially the same. In the case where it is required to make the light distribution of the light emitted from the EL panel 10 asymmetrical, the split surface 9 may be a quadrangular pyramidal lens having a long side and a short side length of -28-201043081 square. Since the dividing surface 9 is rectangular, since the inclination angle of the quadrangular pyramid lens 52 in the short side direction and the inclination angle of the four corners of the long side direction 'cone convex lens 52 are different, it is possible to emit from the EL panel 10 The light distribution of the light becomes asymmetrical in the longitudinal direction and the short side direction. In Fig. 28, the uneven portion 30 is a substantially quadrangular pyramidal lens shape having the apex 52 of the divided constant. The quadrangular pyramid concave lenses are each formed by a ridge line 51, and each of the quadrangular pyramid concave lenses has four vertices 52. However, the method of forming the grooves is not limited to this, and grooves 109 of various depths, pitches, and opening angles extending in various directions may be provided. As described above, the distribution of the light distribution can be adjusted by making the configuration in which the two grooves 51 and the top of the substantially quadrangular pyramid lens shape are orthogonal to each other. In particular, light emitted at a wide angle of 60 degrees or more can be adjusted. By adjusting the shape of the quadrangular pyramid and the shape of the concave lens (depth, inclination angle), the light emitted at a wide angle can be increased or decreased. This is because most of the light that is emitted toward the wide angle is the light that is emitted from the vicinity of the bottom of the quadrangular pyramid lens. Fig. 29 shows a configuration in which the uneven portion 30 is formed by a quadrangular pyramid having a squared quadrangle. The lens shape is arranged without a gap. The uneven portion 30 of the quadrangular pyramid concave lens shape is used to take out the light H that is incident on the uneven portion 30 so as to be emitted toward the irradiation direction F. Further, in the uneven portion 30, since the shape of the quadrangular pyramid concave lens shape and the highest position of the uneven portion 30 shown in Fig. 27 are compared with the square pyramidal lens shape of the dot, since the shape of the highest position of the uneven portion 30 is a line, Therefore, the abrasion resistance is improved and better. In the case where it is required to change the light distribution of the light emitted from the EL panel 10 to the 'symmetry', it is preferable that the divided surface is formed into a substantially square shape and the inclination angles of the four inclined surfaces of the quadrangular pyramid concave lens are substantially the same. -29-201043081 In the case where it is required to make the light distribution of the light emitted from the EL panel 10 asymmetrical, a quadrangular pyramid concave lens 54 having a long side and a short side may be used as the split surface. Since the dividing plane has a rectangular shape, since the inclination angle of the quadrangular pyramid concave lens 54 in the short-side direction is different from the inclination angle of the quadrangular pyramid concave lens in the longitudinal direction, the light distribution of the light emitted from the EL panel 10 can be changed. It is asymmetrical in the longitudinal direction and the short side. Ο

In the case where the uneven portion 30 constitutes a 稜鏡 lens or a quadrangular pyramid shape, the top end of the tip end may be cut to be flat, or rounded to form a curved surface. Further, it is also possible to bend the two side faces constituting the 稜鏡 shape or the four inclined faces constituting the quadrangular pyramid shape into a convex curved surface or a concave curved surface. As described above, by bending into a convex curved surface or a concave curved surface, the light hi incident on the uneven portion 30 can be deflected at a wide angle as compared with a case where the inclined surface is formed in a straight line shape. When the light hi incident on the uneven portion 30 changes the angle to the visual field direction and the color deviation of the color tone changes, the curved light is curved or concavely curved to make the light from the light-emitting layer 2 The light is deflected at a wide range of angles, and it is preferable that the change in the hue of the light of the light-emitting layer 2 is made uniform and independent of the angle of the direction of the field of view. Further, the shape of the unit convex portion 20 in contact with the uneven portion 30 may be arranged to be at least partially serpentine, or the interface between the unit convex portion 20 and the uneven portion 30 is not only located in the valley portion of the uneven portion 30 but also at the top. Or side. According to the above configuration, since the light distributions of the light emitted from the unit convex portions 20 can be changed, it is possible to impart creativity. The width PL of the concave-convex portion 30 along one side of the base material layer 19, that is, the width of the bottom side of the cross-sectional triangle in the case of the 稜鏡 lens, and the width of the straight portion of the semi-elliptical shape in the case of the cylindrical lens. In the case of -30-201043081 of the quadrangular pyramid, the width of one side of the bottom surface is set to be 20 Mm or more and 200 vm or less, so that it is difficult to generate diffracted light in the uneven portion 30, and it is difficult to recognize from the irradiation direction. Further, in order to prevent the surface of the uneven portion 30 from being damaged, the height TL of the uneven portion 30 is formed to be lower than the height TM of the unit convex portion 20, and the heights TL and TM are set such that the difference in height is 5 μm or more. . Further, in order to achieve the desired characteristics, the shape of the unit convexity $20 and the uneven portion 30 and the ratio (area ratio) of the unit convex portion 20 and the uneven portion 30 to the base material layer 19 can be appropriately adjusted. In the light control creative sheet 7 of the present embodiment, as described above, the width PM of the unit convex portion 20 is set to 20 " m or more, 200 ym or less, and the width PL of the uneven portion 30 is set to 20 / zm or more. In this range, the widths PM and PL of the both are set such that the ratio of the width _ PM of the unit convex portion 20 to the width PL of the uneven portion 30 is in the range of 1.1 to 10. When the ratio of the width is less than 1.1, the uneven portion 30 substantially covers the unit convex portion 20. Since the unit convex portion 20 is difficult to recognize by the visual observation of the concave-convex portion 30, the creative pattern of the unit convex portion 20 cannot be recognized, which is not preferable. . On the other hand, when the ratio of the width exceeds 10, the unit convex portion 20 is easily recognized. However, since the uneven portion 30 excessively has a fine structure, the light is scattered in the uneven portion 30, and the light is utilized. Reduced efficiency. In this regard, in the optical member 30 of the present embodiment, since the ratio of the width is set in the range of 1.1 to 10, the creative pattern generated by the unit convex portion 20 can be recognized, and the uneven portion 30 can be prevented. The utilization efficiency of light caused by diffraction is lowered. The light control creative sheet 7 can be provided with a creative pattern by the unit convex portion 20 as shown in Fig. 12 to Fig. 13 or Fig. 30 to Fig. 34. -31- 201043081 As the creative pattern of the unit convex portion 20., a lattice arrangement as shown in Fig. 12(a) may be employed. In Fig. 12(a), a plurality of unit convex portions 20 are arranged in a lattice shape on a substantially square-shaped base material layer 19 with a fine gap therebetween. Moreover, it is also possible to replace the arrangement of the unit convex portions 20, and to adopt a honeycomb arrangement as shown in Fig. 2(b), and a periodic strip as shown in Fig. 2(c). Arranged or arranged in a random arrangement as shown in Fig. 2(d). If the arrangement of the unit convex portions 20 on the plane of the base material layer 19 is periodic, the arrangement density of the unit convex portions 20 can be easily increased, and the amount of light extraction can be increased. On the other hand, if the arrangement of the unit convex portions 20 on the base material layer 19 is non-periodic, no embossing occurs. For example, in the case where the pixel pattern is placed on the EL panel 10, it is more preferable because the pattern formed by the arrangement pattern of the unit convex portion 20 and the interference of the pixel pattern of the EL panel 10 can be prevented. Further, as the creative pattern of the unit convex portion 20, as shown in Fig. 30 (a) and Q, the unit convex portion 20 may be a mixture of a substantially hemispherical shape and a substantially elliptical spherical shape. In the case where the unit convex portion 20 includes a substantially elliptical hemispherical shape, a desired light distribution can be obtained by controlling a ratio in which the long axes of the ellipse are aligned in the same direction. For example, as shown in Fig. 30(a), the light distribution in the direction in which the major axis of the substantially elliptical hemisphere is oriented is wider than that in the direction in which the short axis of the spherical shape is oriented. The tendency of light distribution. This is based on the difference in the slope ratio of the elliptical shape. Thereby, the EL panel 10 in which the light distribution of the emitted light is asymmetric can be produced. Further, as shown in Fig. 30(b), the arrangement of the unit convex portions 20 may be similar to the shape of the inclined angles -32 to 201043081, and the sizes may be different. Further, as in the 31st to 34th drawings, the unit convex portion 20 can be used to form a creative pattern such as a specific character, symbol, pattern, or pattern. • Fig. 31 is an example of forming a creative pattern by the presence or absence of the unit convex portion 20. A creative pattern of the character "T" is formed in the region XI having the unit convex portion 20 and the region Y 1 having no unit convex portion 20. In the case of forming a creative pattern by the above method, since a creative pattern having a large contrast of 0 can be formed, it is preferable to make the creative pattern easy to be conspicuous. Fig. 32 is an example in which a creative pattern is formed by the difference in density of the unit convex portions 20. A region X2 having a high density of the unit convex portion 20 and a region Y2 having a small density of the unit convex portion 20 form a creative pattern of the character "T". In the case where the creative pattern is formed by the above method, the contrast of the creative pattern can be arbitrarily adjusted using an arbitrary density difference. Further, since a creative pattern having a small Q contrast can be formed, it is preferable to form a light creative pattern. Fig. 33 is an example of forming a creative pattern by utilizing the difference in shape of the unit convex portion 20. A creative pattern of the character "T" is formed in a region X3 in which the unit convex portion 20 is formed in a semispherical shape and a region Y3 in which the unit convex portion 20 is formed in a semispherical spherical shape. In the case where the creative pattern is formed by the above-described method, the difference in the light distribution from the unit convex portion 20 caused by the difference in the shape of the unit convex portion 20 can be used to form the creative pattern. When a creative pattern is formed by the difference in the light distribution distribution, in particular, when the angle to the visual field direction is changed, since the creative pattern can be emphasized, it is preferable to form a creative pattern that differs depending on the observation position. Fig. 34 is an example of forming a creative pattern by using the difference in size of the unit convex portion 20. A region X4 in which the unit convex portion 20 is formed in a relatively small size and a region Y4 in which the unit convex portion 20 is formed in a relatively large size form a creative pattern of the character "T". In the case where the creative pattern is formed by the above method, and the method of forming the creative pattern by the presence or absence of the unit convex portion 20 or the difference in the shape of the unit convex portion 20, the inclination angle of the unit convex portion 20 can be made substantially In the same manner, the unevenness of the light distribution in the plane of the EL panel 10 is reduced by making a similar shape, and a creative pattern can be formed. Further, since the height of the unit convex portion 20 in the region X4 and the region Y4 is different, it is preferable not only to visually but also to recognize the creative pattern by touch. Further, as shown in Fig. 35, the creativity of the EL panel 10 can be imparted by the difference in light distribution between the unit convex portion 20 and the uneven portion Q30. For example, in Figs. 35(a) to (c), the visual effect of the case where the unit convex portion 20 has a substantially semispherical microlens shape and the concave and convex portion 30 has a meander shape is shown. In addition, in FIG. 36, the first emitted light that is emitted from the light-emitting medium layer 18 and controlled by the unit convex portion 20, and the light emitted from the light-emitting medium layer 18 are controlled by the uneven portion 30 to be emitted. The light distribution map of the emitted light. When the EL panel 10 is viewed from the front direction (in the region S10 of the light distribution distribution 36), since the luminance of the first emitted light is smaller than the second emitted light, -34- 201043081, the region X5 of the unit convex portion 20 is It is considered to be darker than the area Y5 of the uneven portion 30, and the character "T" is recognized (Fig. 35 (a)). 'The angle of the direction of the field of view is increased, and the case of observing from the oblique direction (in the area of the light distribution distribution, figure 36, $11)> The brightness of the first and second emitted light is reversed because of the second Since the brightness of the emitted light is smaller than that of the first emitted light, the region Y5 of the uneven portion 30 is considered to be darker than the region X5 of the unit convex portion 20, and the oppositely recognized text "T" (Fig. 35 (b)) . Further, when the angle in the direction of the visual field is increased (in the region S12 of the light distribution distribution No. 36), the magnitudes of the luminances of the first and second emitted lights are reversed, and the brightness of the first emitted light becomes a ratio. The second shot is small. This is because the observer visually recognizes the peak of the light and the side lobe generated by the angle of the viewing direction caused by the meandering shape of the uneven portion 30. Therefore, the region X5 of the unit convex portion 20 is regarded as being darker than the region Y5 of the concave convex portion 30, and the character "τ" is recognized (Fig. 35 (c)). When creativeness is imparted by the method shown in Figs. 35 and 36, it is preferable to recognize a creative pattern which differs depending on the angle of the visual field. Q is also 'as a longitudinal cross-sectional shape of the uneven portion 30, and may be arbitrarily used as the top shown in Fig. 37(a), or as the top of the figure shown in Fig. (b). The shape, or the inclined surface forming one or both of the top cross sections as shown in Fig. (c), forming a convex curved surface or a concave curved surface or the like. In other words, in the case shown in Figs. 20 to 37, the light emitted from the unit convex portion 20 is also caused by the deviation from the arrangement conditions specified by the above formulas (1) to (4). Since the difference in light extraction amount is generated from the difference in light emitted from the region 12ba other than the unit convex portion 2A, it is preferable to satisfy the above-described arrangement conditions. -35- 201043081 Next, the material for forming the optical sheet 12 described above will be described. PET (poly-p-ethyl formate), pc (polycarbonate), PMMA (polymethyl methacrylate), c〇p (cycloolefin polymer), acrylonitrile, styrene copolymer, propylene A nitrile polystyrene copolymer, a melamine resin, a thiourethane resin, an epismude resin, or the like is used as a material for forming the optical sheet 12. Further, as the base material layer 19 provided on the optical sheet 12, a resin having low brittleness is preferably used. Examples of the material of the base material layer 19 include (a—) pET, polyfluorene carbonate, (poly)urethane resin, epoxy resin, (poly)ethylene resin, acrylic resin, and acrylonitrile (poly). Styrene resin, ABS resin, and the like. The thickness of the base material layer 19 is also related to the rigidity of the base material layer 9 but it is preferably 50 to 3 gm from the viewpoint of the processing property such as workability. Further, when the unit convex portion 20 and the uneven portion 30 are not firmly adhered to the base material layer 19, or when the force is lowered by the influence of cold heat, moisture absorption, or the like, the bottom material may be adhered to the bottom of the material. The primer layer is provided between the unit convex portion 20 or the uneven portion 30 and the base material layer 19, and may also function as a primer layer for the unit convex portion Q20 or the uneven portion 30. Alternatively, an easy subsequent treatment such as a corona discharge treatment may be applied. As the unit convex portion 20, an ultraviolet curable resin can also be used. When the optical sheet 12 is produced, the ultraviolet curable resin is attached to the mold at a linear velocity of from lm/miη to 3 Om/mi η at the substrate layer 19, and the unit convex portion 20 is formed. Here, when the ultraviolet curable resin is attached to the mold at a lower speed than the linear velocity lm/min, the acrylic resin reacts with the oxygen or moisture in the air before being attached to the mold, and the molding cannot be smoothly performed. On the other hand, when the ultraviolet curable resin is attached to the mold -36 to 201043081 at a higher speed than the linear velocity of 30 m/min, a problem of occurrence of bubble biting occurs. After the unit convex portion 20 made of the ultraviolet curable resin is attached to the base material layer 19 and molded, it is cured by irradiation with ultraviolet rays of from 500 mJ/m 2 to 3000 mJ/m 2 to produce the optical sheet 12 . As the acrylic resin for molding the unit convex portion 20, the effect of the surface strengthening property and the light extraction function can be achieved by mixing a monofunctional acrylic resin and a polyfunctional acrylic resin in a timely manner. Further, as the charging preventing agent, ultrafine particles such as cerium oxide (hereinafter referred to as cerium) containing 锑 0 or cerium-containing indium oxide (ITO) may be dispersed in the conductive fine particles. The antifouling property of the optical sheet 12 can be improved by dispersing the charge preventing agent. As a method of producing the above-mentioned mold, first, about 5 gm of a mold to which copper plating has been applied is sprayed, and the carbon black is dispersed in a lacquer of a resin, and then irradiated with an infrared laser having a wavelength of 1060 nm to sublimate the paint. . Then, the mold was immersed in a ferric chloride chromic acid solution, and copper was etched in the depth direction and the width direction in the same direction to form a portion Q corresponding to the unit convex portion 20. Next, a diamond cutter having various lens shapes is used for this mold, and the cross-sectional shape is cut into a triangle shape to produce a portion corresponding to the uneven portion 30. Such a mold can be used for molding by extrusion molding, injection molding, UV molding, or the like. At this time, the unit convex portion 20, the uneven portion 30, and the base layer 19 may be molded as different elements, or may be molded as an integral element. Further, when the unit convex portion 20, the uneven portion 30, and the base material layer 19 are formed into a 'type, a diffusing agent such as a filler may be dispersed and molded. -37- 201043081 The unit convex portion 20 can be produced by embossing a resin film. In this case, the shaping rate may be 70% or more, and when it is preferably 85% or more, it is often the case where the optical* characteristic hardly differs. The pressure conditions of the embossing at this time are generally 5 to 500 kg/cm, preferably 5 to 300 kg/cm, more preferably 10 to 150 kg/cm. When the linear pressure is smaller than 5 kg/cm, the forming ratio is less than 70%, and the fine unit convex portion 20 cannot be sufficiently shaped. When the linear pressure is larger than 10 kg/cm, it is more preferable because a forming ratio of 85% or more can be obtained. On the other hand, at a line pressure of 500 kg/cm, the load on the machine is too large to be practical. Further, if the line pressure is 300 kg/cra or less, even if the film width exceeds 1 ro, the mechanical load is not too large. If the line pressure is 150 kg/cm, the forming rate can be 99% to 100%, and the forming rate cannot be further improved. Further, in the case where the aspect ratio ARi of the unit convex portion 20 is larger than 0.6, a notch is formed in the unit convex portion 20 when the optical sheet 12 is peeled off from the mold. Therefore, as shown in the above formula (1), the width and height of the unit convex portion 20 are preferably 0.6 or less. Next, the material of the constituent elements other than the optical recording sheet 12 will be specifically described for the EL panel 10 shown in Fig. 1 . The substrate 15A of the EL element 11 is made of a plate of glass, metal, or resin. Next, the cathode 15B is disposed on the surface of the substrate 15A on the side of the light-emitting medium layer 18. The cathode 15B is a layer having conductivity, and is a voltage applied to the light-emitting medium layer 18. The material constituting the cathode 15B is an aluminum plate or an aluminum plate is deposited on the substrate 15A. Further, the material having conductivity for the cathode 15B is not limited to the above-described aluminum, and various metals such as gold, silver, and copper, or carbon having conductivity may be used. -38- 201043081 Next, the 'transparent substrate 15B' has a function of transmitting light emitted from the light-emitting medium layer 18. As the material of the transparent substrate 15B, in addition to various glass materials, plastic materials such as PMMA, polycarbonate, and polystyrene can be used. Here, a cycloolefin-based polymer is preferable, and the polymer material-based resin is excellent in properties such as processability, heat resistance, water resistance, and optical light transmittance. Further, since the transparent substrate 15 5 can transmit the light emitted from the optical medium layer 18 as much as possible, it is preferably formed of a material having a total light transmittance of 50% or more. The adhesive layer 13 is provided on the light exit surface side of the transparent substrate 15B, and fixes the optical sheet 12 and the transparent substrate 15B. Here, examples of the adhesive for forming the adhesive layer 13 include a propionate-based, urethane-based, rubber-based, and anthrone-based adhesive. Since either case is used in a high-temperature backlight, the elastic modulus G is preferably stored at 1 〇〇 t, preferably l. 〇 E + 04 (Pa) or more. Further, in order to emit light of uniform Q, transparent particles such as beads may be mixed into the adhesive layer 13. Further, as the adhesive/adhesive agent, a double-sided tape can also be used. The light-emitting medium layer 18 has the configuration shown in Fig. 2, and preferably includes a light-emitting layer 21 and a hole transport layer 22 between the cathode 16 and the anode 17. Further, a layer which functions as an electron injection layer 'charge blocking layer and an electron transport layer (not shown) may be provided on the light-emitting medium layer 18 as needed. Laminated between the light-emitting layer 21 and the anode 17 is a hole injection layer, an electron blocking layer, and a hole transport layer 22 (not shown). Formed between the light-emitting layer 21 and the cathode 16 is a hole barrier layer (not shown), an electron injection layer, and an electron transport layer of -39-201043081. Further, as the hole transporting material constituting the hole transporting layer 22, polyaniline derivatives, polythiophene derivatives, polyvinylcarbazole (PVK) derivatives, and poly(3,4-ethylenedioxythiophene) may be mentioned. (1^〇〇1), etc., but the invention is not limited thereto. These materials can be dissolved or dispersed in a solvent, and can be applied once by a spin coating method, a protrusion coating method, or a dip coating method. Further, by using the relief printing method, a line pattern having uniform film formation without film formation can be obtained in accordance with the pixel pitch. Further, in the case where an inorganic material is used as the hole transporting material, as the inorganic material, chromium (Cr), tungsten (W), vanadium (V), niobium (Nb), molybdenum (Ta) may be formed by vacuum deposition. Molybdenum (Mo), titanium (Ti), chromium (Zr), (Hf), strontium (Sc), strontium (Y), manganese (Mn), iron (Fe), strontium (Ru), hungry (Os), Oxides, nitrides, and oxynitrides such as cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), and cadmium (Cd). At this time, a one-time formation or line pattern can be obtained by using an arbitrary shadow mask. A more stable EL element 11 having excellent thermal stability and resistance can be obtained by providing a hole transport layer made of an inorganic material. Further, an intermediate layer (not shown) having a hole injection function and an electron blocking function can be formed between the anode 17 and the light-emitting layer 21 after the hole transport layer 22 is formed. As a material for the intermediate layer, polyethylene azole or a derivative thereof, a polyaryl derivative having an aromatic amine in a side chain or a main chain, an arylamine derivative, and a triphenyldiamine may be mentioned. A polymer or the like containing an aromatic amine such as a derivative, but the present invention is not limited thereto. The material of the intermediate layer described above can be dissolved or dispersed in a solvent, and formed by various coating methods of a spin coater, a printing method such as a relief printing method, a gravure printing method, or a screen printing method. -40- 201043081 In addition, when an inorganic material is used as the intermediate layer material, as the inorganic material, chromium (Cr), tungsten (W), vanadium (V), 铌' (Nb), yttrium can be formed by vacuum deposition. (Ta), molybdenum (Mo), titanium (Ti), pin (Zr), bell (Hf), strontium (Sc), strontium (Y), manganese (Μη), iron (Fe), strontium (Ru), hungry Oxides, nitrides, nitrogen oxides, such as cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), and cadmium (Cd). At this time, a formation or line pattern can be obtained by using an arbitrary shadow mask. By providing an intermediate layer composed of an inorganic material, a more stable EL element 11 having excellent heat stability and resistance can be obtained. The light-emitting layer 21 may also be a white light-emitting layer or a monochromatic light-emitting layer of blue, red, yellow, green or the like. Here, in the case where the light-emitting layer 21 is a white light-emitting layer, the configuration of the anode π/light-emitting medium layer 18/cathode 16 may be, for example. ITO/CuPc (copper indigo) / 1% red fluorene is doped to α - NPD / 1% phenanthrene is doped to naphthoquinone / Alq3 / lithium fluoride / as a cathode Α1. The light-emitting layer 21 is formed after the intermediate layer is formed. The light-emitting layer 21 is an organic light-emitting material that forms a light-emitting layer 21 by a layer that emits light by flowing a current, and examples thereof include a coumarin, a phenanthrene, an anthraquinone, an onionone, and a porphyrin. '(porphyrin), sputum ketone, oxime, Ν'-dialkyl substituted sulfonyl ketone, naphthyl quinone imine, Ν, Ν '-diaryl substituted pyrrolopyridinium, ruthenium complex A luminescent pigment such as a polystyrene, a polymethyl methacrylate methyl methacrylate or a polyvinyl carbazole, and a polycondensation aryl group, a poly aryl vinyl group, and a polyfluorene system. The polymer material, but the invention is not limited to these materials. 'These organic light-emitting materials are dissolved or stably dispersed in a solvent to become an organic light-emitting ink. Examples of the solvent-41-201043081 which dissolves or disperses the organic light-emitting material include toluene, xylene, acetone, anisole (&1115〇16), methyl ethyl ketone, and methyl isobutyl ketone. A mixed solvent of cyclohexanone or the like, alone or in combination. Among them, aromatic organic solvents such as toluene, xylene and anisole are suitable for solubility in organic 'luminescent materials. Further, an interface activator, an antioxidant, a viscosity adjuster, an ultraviolet absorber, or the like may be added to the organic light-emitting ink as needed. In addition to the above polymer materials, a 9,10-diarylfluorene derivative, ruthenium, coronene, anthracene, ruthenium, 1,1,4,4,4-tetraphenylbutadiene, Reference (8-quinoline) aluminum complex, ginseng (4-methyl-8-quinoline) aluminum complex, bis(8-quinoline) zinc complex, ginseng (4-methyl-5-) Trifluoromethyl-8-quinoline) aluminum complex, ginseng (4-methyl-5-cyano-8-quinoline) aluminum complex, bis(2-methyl-5-trifluoromethyl- 8-quinolinic acid group [4-(4-cyanophenyl) phenolate] aluminum complex, bis((2-methyl-5-cyano-8-quinolinyl)[4_ (4 Monocyanophenyl) phenate]) aluminum complex, bis(8-quinolinyl) ruthenium complex, bis[8-(p-toluenesulfonyl)aminoquinoline] zinc And a low molecular weight luminescent material such as a cadmium complex, 1,2,3,4-tetraphenylcyclopentadiene or a poly-2,5-dioxanyloxy group. As a method of forming the light-emitting medium layer 18, a dry coating method such as a vacuum deposition method or a CVD method, or a wet coating method such as an inkjet printing method, a relief printing method, a gravure printing method, or a screen printing method may be used depending on the material. Existing film formation methods such as the law. [Examples] (Method of Producing Optical Sheet 12) Next, Comparative Examples 1 to 3 and Examples 1 to 3 will be described with respect to a method of producing the optical sheet 12. -42-201043081 (Comparative Example 1) The base layer 19 formed in the optical sheet 12 was coated on the base material layer 19 which was formed by optically extending the 2-axis optical film (film thickness: 125/m). An ultraviolet curable resin containing a urethane acrylate as a main component (a urethane acrylate resin (refractive index n = 1.51) manufactured by Nippon Kayaku Co., Ltd.). Then, using a micro-lens having an aspect ratio of ARa = 0.3 and a diameter Di of the bottom portion 20c of 100 as a unitary convex portion 20, a PET film coated with an ultraviolet curable resin is conveyed while being PET 0 film side. UV exposure. Thereby, the ultraviolet curable resin is cured. After the hardening, the optical sheet 12 having a unit convex portion 20 having a diameter of 100/zm was produced by demolding the mold from the PET film. However, when the EL element 11 of the EL panel 10 is bonded to the optical sheet 12 and measured, a sufficient amount of light extraction cannot be obtained. (Comparative Example 2) An amine which is formed by patterning the unit convex portion Q 20 in the optical sheet 12 is applied onto the base material layer 19 which is formed by optically extending the 2-axis optical film (film thickness 125 #m). An ultraviolet curable resin containing a urethane acrylate as a main component (a urethane acrylate resin (refractive index n = 1.51) manufactured by Nippon Kayaku Co., Ltd.). Then, using a cylindrical mold in which the microlens having an aspect ratio ARa = 0.7 and a diameter of 100 gm is formed as the unit convex portion 20, the PET film coated with the ultraviolet curable resin is conveyed while being exposed to ultraviolet rays from the PET film side. Thereby, the ultraviolet curable resin is cured into the unit convex portion 20. After the hardening, although the mold was released from the PET film, the 稜鏡 lens constituting the single-position convex portion 20 was notched, and the mold could not be released. (Comparative Example 3) -43- 201043081 A polycarbonate resin of a thermoplastic resin was heated to about 300 ° C, and a film having a thickness of 〇.3 mm was formed as a base material layer 19 on one side of the roll. In the film made of a polycarbonate resin, the apex 20a of the unit convex portion 20 formed by the concave unit projection shape having the aspect ratio ARa = 0.6', and the other adjacent molding 2 are formed in the same manner. When the shortest side of the acute triangle formed by the apex 20 a of the unit convex portion 20 is the short side E1 and the longest side is the long side E2, the long side E2 is used as the arrangement of the short side E1 15 times. The cylindrical mold which is processed by the uranium engraving cylinder is cooled while being pressed against the heated film (the cylindrical mold temperature is 12 (TC), and a film in which a plurality of unit convex portions 20 are formed is obtained as the optical sheet 12. Thereby, although the optical sheet 12 having the unit convex portion 20 having a diameter of 50/zm can be produced, a sufficient amount of light extraction cannot be obtained. (Example 1) It is easy to follow the PET film by extending from the optical axis. On the base material layer 19 composed of a film thickness of 125 / zm), an ultraviolet ray-curable resin containing urethane acrylate as a main component for forming a pattern of the unit convex portion 20 in the optical sheet 12 is applied. (Nippon Chemical Co., Ltd. made urethane acrylate resin ( The firing rate n = 1.5 1)), and the cylindrical mold of the unit convex portion 20 formed by the microlens having the aspect ratio ARa = 0.5 and the diameter Di of 10 〇 Am formed by the shape of the optical sheet 12 is conveyed and coated. The film of the ultraviolet curable resin is exposed to ultraviolet rays from the PET film side, whereby the ultraviolet curable resin is cured into the unit convex portion 20. After the curing, the mold can be released from the PET film. An optical sheet 12 having a group of unit projections 20 having a diameter of 100/m. (Example 2) -44- 201043081 The polycarbonate resin of the thermoplastic resin is heated to about 300 ° C, and stretched along the roll on one side. A film having a thickness of 0.3 mm is formed on one side as a base material layer 19, and a heated film is used on a cylindrical mold having a concave shape of a unit having an aspect ratio of ARa = 〇.6 by etching. The film was cooled while being pressurized (the temperature of the cylindrical mold was 120 ° C), and a film in which the pattern of the unit convex portion 20 was formed was obtained as the optical sheet 12. Thereby, the optical unit having the unit convex portion 20 having a diameter of 50 / zm was produced. Sheet 12. Q (Example 3) will be thermoplastic The polycarbonate resin of the resin is heated to about 300 ° C, and a film having a thickness of 〇.3 mm is formed along one side of the roll. As the substrate layer 19, a unit of a concave shape having an aspect ratio of ARa = 0.4 is used. The shape of the convex portion. The apex U1 of the formed unit convex portion 20 and the shortest side of the acute-angled triangle formed by the apex 20a of the other two adjacent unit convex portions 20 which are formed in the same manner are set as the short side E1 and the longest When the side is set to the long side E2, a cylindrical mold in which the cylinder is Q-processed by etching with a long side E2 of 1.5 times the short side E1 is used, and the surface is cooled while being pressed against the heated film (the cylinder mold temperature is 1). At 20 ° C), a film in which the pattern of the unit convex portion 20 is formed is obtained as the optical sheet 12. Thereby, the optical sheet 12 having the unit convex portion 20 having a diameter Di of 100 / zm can be produced, and a sufficient amount of light extraction can be obtained. _ As described above, the EL panel 1 〇 ' according to the present embodiment can be used by using an area having the formulas U(2), (2), (3), and (4) The optical sheet 12 is intended to improve light extraction efficiency. Again

The EL panel 1 of the present embodiment is driven by a pixel, in other words, the light-emitting structure of the EL-45-201043081 panel ίο has a pixel structure, and can constitute a display device. The display device configured in this manner is also included in the present invention. The scope of the invention. Further, the optical sheet 12 of the present invention does not necessarily satisfy all of the formulas (1) to (4), and a high light extraction amount can be obtained as long as at least the formulas (1) and (2) are satisfied. And high brightness. Moreover, since the EL panel 10 of the present invention has excellent light extraction efficiency, it can be suitably used for various other applications than display devices. For example, the EL panel 10 of the present invention can also be suitably used as a display device, a lighting device, a liquid crystal display device, and a liquid crystal backlight required for a liquid crystal display device, and is included in the scope of the present invention. The liquid crystal display device may be configured to include a liquid crystal display element in the backlight for liquid crystal. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a longitudinal cross-sectional view showing a configuration of an EL panel according to a first embodiment of the present invention. Fig. 2 is a view showing the configuration of a light-emitting medium layer in the EL element shown in Fig. 1. q Fig. 3 is an optical sheet used in the EL panel shown in Fig. 1, and U) is a main part perspective view showing a first reference example of a unit convex portion of the optical sheet, and (b) is a diagram showing (a) The brightness profile of the unit convex portion shown. Fig. 4(a) is a perspective view showing a main portion of a unit convex portion in a second reference example of the optical sheet, and Fig. 4(b) is a view showing a luminance distribution thereof. Fig. 5(a) is a perspective view of a main portion of a unit convex portion in a third reference example of the optical sheet, and (b) shows a luminance distribution map thereof. Fig. 6(a) is a perspective view of a main portion of a unit convex portion of a fourth reference example of the optical sheet, and (b) shows a luminance distribution map thereof. -46- 201043081 Fig. 7(a) is a perspective view of a main portion of the unit convex portion of the fifth reference example of the optical sheet, and Fig. 7(b) shows a luminance distribution map thereof. Fig. 8(a) is a perspective view of a main portion of a unit convex portion of a sixth reference example of the optical sheet, and (b) shows a luminance distribution map thereof. Fig. 9(a) is a perspective view of a unit convex portion in an optical sheet according to an embodiment of the present invention, and Fig. 9(b) is a graph showing a luminance distribution thereof. Fig. 10 is a view showing the ratio of the light extraction amount in accordance with the aspect ratio of the unit convex portion when the refractive index is changed in the optical sheet of the embodiment of the present invention. Fig. 11 is a view showing the relative luminance of the optical sheet according to the embodiment of the present invention in response to the aspect ratio of the unit convex portion when the refractive index is changed. Fig. 1 (a), (b), (c), and (d) are plan views showing the arrangement of the unit convex portions in the optical sheet of the embodiment. Fig. 13 (a), (b) and (c) are views showing an example of the arrangement of the unit convex portions in the optical sheet of the embodiment. Fig. 14 is a view showing a comparison example of the arrangement ratio of the unit convex portions in the optical sheet. Fig. 15 is a view showing a comparative example of the arrangement of the unit convex portions. Fig. 16 is a view showing an example of the arrangement of the unit convex portions of the optical sheet of the embodiment, and the shortest side and the longest side of the acute-angled triangle between the tops of the three unit convex portions which are close to each other. Fig. 17(a) is a view showing a change in the amount of light taken out when the ratio of the shortest side and the longest side of the acute triangular triangle connecting the top of the adjacent three unit convex portions is E2/E1, and (b) is the relative A graph of brightness. Fig. 18(a) is a view showing a unit of the optical sheet of the embodiment of the present invention -47-201043081, and (b) is a view showing a unit convex portion shown by (a) by a laser microscope. Fig. 19 is a plan view showing a first example of the shape and arrangement of the unit convex portions of the optical sheet of the embodiment. Figure 20 is a view showing an example of an optical sheet according to a second embodiment of the present invention. Figure 21 is a view showing another example of the optical sheet of the second embodiment of the present invention. Fig. 22 is a view showing another example of the optical sheet of the second embodiment of the present invention. Figure 23 is a view showing another example of the optical sheet of the second embodiment of the present invention. - Fig. 24 is a view showing another example of the optical sheet of the second embodiment of the present invention. Fig. 25 is a view showing an example of the uneven portion of the present invention. Fig. 26 is a view showing another example of the uneven portion of the present invention. Fig. 27 is an explanatory view showing another embodiment of the light control creative sheet of the present invention. Fig. 28 is an explanatory view showing another embodiment of the light control creative sheet of the present invention. Fig. 29 is an explanatory view showing another embodiment of the light control creative sheet of the present invention. Fig. 30 is an explanatory view showing another embodiment of the creative pattern constituting the unit convex portion of the present invention. Fig. 31 is a view showing another embodiment of the creative pattern constituting the unit convex portion of the present invention - 48 - 201043081. Fig. 32 is an explanatory view showing another embodiment of the creative pattern constituting the unit convex portion of the present invention. Fig. 33 is an explanatory view showing another embodiment of the creative pattern constituting the unit convex portion of the present invention. Fig. 34 is an explanatory view showing another embodiment of the creative pattern constituting the unit convex portion of the present invention. Fig. 3 is a diagram showing the creative illustration of the light control creative film of the present invention. Fig. 36 is an explanatory view showing the light distribution of the light control creative sheet of the present invention. Fig. 37 (a), (b), and (c) are longitudinal cross-sectional views showing a modified example of the optical sheet of the embodiment. Fig. 38 is a view showing a microlens element in a conventional optical sheet. [Main component symbol description] 10 EL panel 11 EL component 12 Optical sheet 15A Substrate 15B Transparent substrate 16 Cathode 17 Anode 18 Light-emitting medium layer 20 Unit convex portion 20a Vertex (top) -49- 201043081 20c Bottom surface 21 Light-emitting layer hi, h1 a Emitting light hlb reflected light

Claims (1)

201043081 VII. Patent application scope: 1. An EL panel having a light-transmitting substrate; an EL element having a light-emitting medium layer disposed on one side of the light-transmitting substrate and sandwiched by the anode and the cathode; and optical The sheet is provided on a surface opposite to the EL element on the light-transmitting substrate; and the EL panel is characterized in that the optical sheet is provided with a plurality of unit convex portions having a refractive index η on a surface opposite to the EL element. The unit convex portion has a cross-sectional area of a cross section parallel to the bottom surface of the unit convex portion from the bottom surface of the unit convex portion to the top portion, and a cross section farthest from the bottom surface is used as the top portion, and the unit convex portion will be The diameter of the bottom surface of the portion is set to Di, the length from the bottom surface to the top portion is set to the height Ti of the unit convex portion, and the aspect ratio of the unit convex portion is defined as ARi = Ti/Di, and the width and height of the plurality of unit convex portions are defined. In the case where the average 値 of ARi is set to ARa, the relationship of the following formulas (1) and (2) is satisfied, 0.4S ARaS 0.6 (1) and 1.44^ 1.7 (2). 2. The EL panel of claim 1, wherein the distance between the tops of the two adjacent unit convex portions is B12, and the diameters of the bottom surfaces of the adjacent two unit convex portions are respectively set. When Di, D(i+l), the following formula (3) is satisfied, Di/2 + D(i + l)/2 ^ B12 (3) Meanwhile, when the unit convex portion is to be connected The top of the acute triangle formed by the top of the two other convex parts of the other than the other top of the top is set to E1, and the longest side is set to E2 to 'satisfy' as follows ( 4) The relationship of the formula, • 1 ^ E2/E1 ^ 2 ... (4). 3. The EL panel of claim 1 or 2, wherein the bottom surface of the unit convex portion is circular or square. 4. An EL panel comprising a light-transmitting substrate; 0 EL element comprising a light-emitting medium layer disposed on one side of the light-transmitting substrate and sandwiched by an anode and a cathode; and an optical sheet The optical substrate is disposed on a surface opposite to the EL element; _ the EL panel is characterized in that: the optical sheet is a light control creative sheet; the light control creative sheet has: a plurality of unit convex portions separated by a space a surface disposed on a side opposite to the ELS member; and a plurality of concave and convex portions arranged in a gap without being interposed between the unit convex portions, and each having a lens having a height lower than the unit convex portion. The arrangement of the unit convex portions forms a creative pattern, and the arrangement of the concave and convex portions forms a substantially regular regular arrangement pattern. 5. An EL panel having a light-transmitting substrate; 'EL element having a light-emitting medium layer disposed on one side of the light-transmitting substrate and sandwiched by an anode and a cathode; and -52-201043081 optical sheet The light-transmitting substrate is disposed on the EL element surface; the EL panel is characterized by: 'The optical sheet light control creative sheet; the light control creative film system has: a plurality of unit convex portions, which are separated from each other And a plurality of concave and convex portions arranged at intervals on the opposite side of the member; and the plurality of concave and convex portions are arranged so as to be buried in the unit convex portions without gaps, and each of the constituent heights is lower than the unit convex portion from the light-emitting medium layer The emitted light is compared with the first and second emitted light when the first emitted light emitted by the unit is controlled by the light uneven portion emitted from the light-emitting layer, and the first light is emitted. The light is different from at least one of the second emission direction and the luminance distribution. 6. The EL panel of claim 4 or 5, wherein the inclined angle formed by the inclined surface of the portion and the bottom surface, the inclination angle of the end portion of the unit Q square and the inclination of the other of the unit convex portions The angles are different. 7. The EL panel of claim 4, wherein the cross section forms a convex lens or a prism shape, and is in the form of a strip in the presence of the strip, the convex lens or dome shape. The convex portions are arranged in parallel with each other. 8. The EL panel of claim 4, wherein the cross section forms a convex lens or a dome shape, and is in the form of a strip in the presence of the strip or the convex lens or dome. a lens on the opposite side of the EL element; the convex portion control is extended in the direction of the concavo-convex portion as the end portion of the one of the unit convex and convex portions emitted by the light emitted from the first light in the direction of the single concave and convex portion The extensions are arranged to cross each other between the single-53-201043081-position convex portions. 9. The EL panel of claim 4, wherein the concave-convex portion has a polyhedral lens portion having a polygonal bottom portion or a polygonal concave lens portion having a polygonal shape at the bottom without a gap. A lighting device characterized by using the EL panel of any one of claims 1 to 9. A liquid crystal display device characterized by comprising the illumination device of claim 10 and the liquid crystal display element. A display device characterized in that the EL panel of any one of claims 1 to 3 is pixel-driven. -54-