JP5741121B2 - A mold for manufacturing an optical lens sheet for controlling an illumination optical path, the sheet manufactured using the mold, a method of manufacturing the sheet using the mold, a liquid crystal display device, and a display - Google Patents

Description

  The present invention relates to a mold for an optical lens sheet, and more specifically, used for illumination light path control, and in particular, has a condensing diffusion function used for illumination light path control in an image display device typified by a flat panel display. The present invention relates to an optical lens sheet, a manufacturing method, a display device, and a display.

  In recent large-sized liquid crystal televisions, flat display panels and the like, a direct type illumination device and an edge light illumination device are mainly used. In the direct type illumination device, a plurality of cold cathode fluorescent lamps (CCFLs) and LEDs (Light Emitting Diodes) are regularly arranged as light sources on the back surface of the panel. A light diffusing plate is used between the image display element such as a liquid crystal panel and the light source so that a cold cathode tube or LED as a light source is not visually recognized.

  On the other hand, in an edge light type lighting device, a plurality of light sources such as cold cathode tubes and LEDs are arranged on an end face of a light-transmitting plate called a light guide plate. In general, a light deflection surface that efficiently guides incident light incident from the end surface of the light guide plate to the exit surface is formed on the surface opposite to the exit surface of the light guide plate (the surface facing the image display element). The light deflecting elements formed on the light deflecting surface include various light deflecting elements for efficiently leading to the exit surface, such as those printed with a white dot pattern or those provided with a lens shape. Proposed.

  However, since the edge light system has a structure in which the light source is disposed only on the end face of a light-transmitting plate called a light guide plate, the number of light sources installed is limited. Therefore, as the liquid crystal display device becomes larger, it becomes difficult to brighten the entire display, and the role of the optical lens sheet for improving the brightness becomes important.

  As a means for improving the brightness of a liquid crystal display screen, a brightness enhancement film (Brightness, Enhancement, Film: BEF), which is a registered trademark of 3M USA, is widely used as an optical lens sheet.

  12 and 13 show the brightness enhancement optical lens sheets described in Patent Documents 1 and 2 below. FIG. 12 schematically shows a surface light source 21, a BEF 23 serving as a brightness-enhancing optical lens sheet on which light emitted from the surface light source 21 is incident, and a liquid crystal panel 22. As shown in FIG. 13, the BEF 23 is an optical lens sheet in which unit prisms 25 having a triangular cross section are periodically arranged in one direction on a transparent substrate 24. The unit prism 25 has a size (pitch) larger than the wavelength of light.

  The BEF 23 collects light from “off-axis” and redirects this light “on-axis” or “recycle” toward the viewer. Can be made. That is, the BEF 23 can increase the on-axis brightness by reducing the off-axis brightness when using the liquid crystal display device (when observing). The “on-axis” mentioned here is a direction that coincides with the visual direction F of the observer in FIGS. 12 and 13, and is generally on the normal direction side with respect to the display screen of the liquid crystal panel 22.

As shown in FIG. 14, when using an optical lens sheet 27 typified by BEF 23, a diffusion sheet 26 in which a diffusion filler is applied on a transparent substrate is interposed between the light guide plate 16 and the optical lens sheet 27. By arranging, luminance unevenness of the light emitted from the light guide plate 16 can be suppressed.

  Furthermore, when the diffusion sheet 26 is arranged between the optical lens sheet 27 and the liquid crystal panel 22, the side lobe of the emitted light caused by the prism sheet can be reduced, and the lenses arranged regularly. Moire interference fringes generated between the liquid crystal pixels and the liquid crystal pixels can be prevented.

  By the way, as described above, the light guide plate 16 used in the edge light system includes the light deflection surface 18 at a position facing the exit surface, and the light deflection surface 18 has a white dot pattern or a microlens (concave or convex). ), And other lens-shaped light deflection elements 20 are formed.

  However, any optical deflection element 20 is formed of a reflective layer or a structure that is regularly or regularly arranged in a pseudo-random manner, so that the optical element represented by the BEF 23 described above is used. There are problems such as interference with the lens sheet 27 (moire fringes) and unevenness of the light deflection surface 18 being visually recognized. As a means for solving the problem, there is a patent between the light guide plate 16 and the optical lens sheet 27. A method using a diffusion sheet 26 as shown in Document 4 is common.

  The BEF 23 is one of the most efficient optical lens sheets for improving the brightness in the front direction. However, in a medium or large-sized liquid crystal display device exceeding 20 inches, the display becomes dark only by the light condensing action of the BEF 23. End up. One method for further improving the front luminance is, for example, a method in which two BEFs 23 are arranged in a cross, but there is a problem that the viewing angle of the liquid crystal display device becomes extremely narrow. Compared to a notebook personal computer, a portable information terminal, or the like, a liquid crystal display device for television use requires a sufficient viewing angle, and particularly requires a sufficient viewing angle in the horizontal direction.

  Therefore, in order to conceal the light deflection element 20 formed on the light deflection surface 18, the diffusion sheet 26 having almost no light collecting action must be disposed, and the front luminance necessary for the liquid crystal display device is obtained. Therefore, there is a problem that it is not sufficient to use only one BEF23.

  As a technique for improving the front luminance of an edge light type illumination device, Patent Document 5 discloses that an optical lens sheet having a triangular prism shape and an optical lens sheet having an elliptical cross section are arranged substantially orthogonally. Means for doing so are disclosed.

  However, in order to conceal the light deflection element 20 formed on the light guide plate 16, it is necessary to dispose the diffusion sheet 26 between the light guide plate 16 and the elliptical optical lens sheet, and the luminance improvement effect is most obtained. As the triangular prism optical lens sheet, for example, although the above-described BEF 23 can improve the front luminance, sidelobe light is generated. Therefore, a diffusion sheet is provided between the triangular prism optical lens sheet and the liquid crystal display element. 26 need to be arranged.

  Therefore, in the configuration shown in Patent Document 5, two diffusion sheets, an elliptical optical lens sheet, a triangular prism optical lens sheet, and four optical films are required, which increases costs.

In addition, examples of methods for mass-producing optical lens sheets include extrusion molding methods and UV molding methods, which are representative examples, and both are important factors for scratch resistance of optical lens sheet molds during molding. In addition, if the optical lens sheet mold is not excellent in scratch resistance, the optical lens sheet mold itself is defective due to scratches and the like, resulting in a significant production cost.

  Furthermore, the shape that easily obtains the high luminance required for the optical lens sheet is prism shape> cylindrical shape, but in order to have desired optical characteristics, the cylindrical shape may be desirable depending on the configuration of the backlight unit. Therefore, the demand for increasing the brightness of the cylindrical shape is increasing.

Japanese Patent Publication No. 1-378001 JP-A-6-102506 Japanese National Patent Publication No. 10-506500 JP 2004-295080 A JP-A-8-146225

On the other hand, in order to prevent cold cathode fluorescent lamps and LEDs as a light source from being visually recognized, moiré (interference fringes) easily occurs not only in the light source, pixels, etc., but also in the films, thereby reducing this. In order to do so, a diffusion sheet or the like is required. For this reason, there is a problem that the number of members used increases, leading to an increase in cost.
Also, when the unit shape is a prism shape, it is effective for improving the brightness but is inferior in scratch resistance. On the other hand, in the case of a cylindrical shape, although it is excellent in scratch resistance, it is difficult to improve luminance.

As means for solving the above-mentioned problems, the invention of claim 1 is a mold for manufacturing an optical lens sheet for controlling an illumination optical path from a light source of a display, and the surface of the mold has an uneven unit shape. and repeating pattern of a, the entire surface of the unit shape a, along its surface, in which are formed so as repeating pattern of units shape B fine fine uneven portions than the width of the unit shape a covers There is provided a mold for manufacturing an optical lens sheet for controlling an illumination optical path.

  According to a second aspect of the present invention, the width of the unit shape B of the fine concavo-convex portion is a fine concavo-convex portion having a width of 0.2 μm or more and 5 μm or less. This is a lens sheet manufacturing mold.

  In the invention of claim 3, the maximum difference between the vertices of the convex portions of the unit shape B of the fine unevenness portion or the maximum difference between the lower ends of the concave portions of the unit shape B is 0.2 μm or more and 2 μm or less. 3. A mold for manufacturing an optical lens sheet for controlling an illumination optical path according to claim 1 or 2.

  According to a fourth aspect of the present invention, an illumination optical path control optical lens sheet is manufactured using the illumination optical path control optical lens sheet manufacturing mold according to any one of the first to third aspects. It is a manufacturing method of a control optical lens sheet.

  A fifth aspect of the present invention is an illumination optical path controlling optical lens sheet manufactured using the illumination optical path controlling optical lens sheet manufacturing mold according to any one of the first to third aspects.

  A sixth aspect of the present invention is a liquid crystal display device on which the illumination optical path controlling optical lens sheet according to the fourth or fifth aspect is mounted.

  A seventh aspect of the present invention is a display including the liquid crystal display device according to the sixth aspect.

  According to the invention described in the present invention, the surface of the mold for the optical lens sheet has fine irregularities finer than the width of the unit shape on the surface, so that the pixel of the panel and the optical lens sheet interfere with each other. Moire (interference fringes) is less likely to occur, and a diffusion sheet or the like is not required, so that the number of members used is reduced, resulting in cost reduction.

  Further, when the unit shape is a prism shape, the scratch resistance is improved, and when the unit lens is a cylindrical shape, the luminance can be improved.

  Furthermore, the optical lens sheet mold of the present invention can be formed only by a mold processing machine (lens shape forming machine), which reduces the cost.

It is a perspective view which shows the metal mold | die for optical lens sheets. It is a perspective view of the optical lens sheet of the one-dimensional arrangement whose unit shape makes a prism shape. It is a perspective view of the optical lens sheet of the one-dimensional arrangement | positioning whose unit shape makes a cylindrical shape. It is a perspective view of the optical lens sheet of the two-dimensional arrangement whose unit shape makes a prism shape. It is a perspective view of the optical lens sheet of the two-dimensional arrangement whose unit shape makes a cylindrical shape. It is sectional drawing of the optical lens sheet of the two-dimensional arrangement | positioning which a unit shape consists of a prism shape and a cylindrical shape. It is sectional drawing of a unit shape in which a unit shape makes a prism shape. It is sectional drawing of a unit shape in which a unit shape makes a cylindrical shape. It is sectional drawing which linearized the shape tangent of the unit shape. It is sectional drawing which linearized the shape tangent of the unit shape. It is explanatory drawing of the extrusion method. It is principal part sectional drawing which shows the arrangement configuration of the liquid crystal display device containing BEF by a prior art. It is a perspective view of BEF shown in FIG. This is a conventional liquid crystal display device comprising a combination of a diffusion sheet and BEF. It is the figure which showed the optical lens sheet formation method to the circumference direction. It is the figure which showed the optical lens sheet formation method to an axial direction.

  First, the sectional shape of the unit shape will be described.

  The unit shape A (1) referred to in the present invention is a general term for the prism shape (2) or the cylindrical shape (4) as shown in FIG.

  Optical Lens Sheet FIGS. 2 to 6 show the optical lens sheet (15) formed by arranging the unit shape A (1), which is composed of a prism shape (2) or a cylindrical shape (4).

  When the unit shape A (1) forms a prism shape (2), in order to improve the scratch resistance, the unit shape B (3) of the fine irregularities is formed with a desired cylindrical shape (4) cutting tool. The unit shape B (3) of the fine irregularities is arranged so as to be along the shape tangent line (14) of the unit shape (2).

  In particular, as shown in FIG. 7, when the shape of the fine concavo-convex portion is rounded at the apex portion, the apex of the unit shape B (3) is not cut, so that the scratch resistance is improved. In addition, when using such a rounded fine uneven part, even if it is the structure which attaches a fine uneven part only to the prism-shaped surface of FIG. 6, scratch resistance is good.

  On the other hand, when the unit shape A (1) has a cylindrical shape (4), in order to improve the brightness, the unit shape B (5) of the fine concavo-convex part is formed with a cutting tool having a desired prism shape (2). Then, the unit shape B (5) of the fine uneven portion is arranged so as to follow the shape tangent 14 of the unit shape A (4).

  The shape tangent (14) refers to the shape tangent of the unit shape A1, and FIG. 9 or 10 is a diagram obtained by linearizing the shape tangent (14) of the unit shape A (1), and will be described later. It is explanatory drawing about (12) or depth (13).

Next, the width (12) of the unit shape B (3) or (5) of the fine uneven portion will be described.
The width (12) refers to a part generally called a pitch. When the width (12) of the unit shape B (3) or (5) of the fine uneven portion is 6 μm or more, moire is likely to occur. Therefore, the width of the unit shape B (3) or (5) of the fine uneven portion ( 12) is preferably 5 μm or less.

The depth (13) of the unit shape B (3) or (5) of the fine irregularities will be described.
The depth difference (13) of the fine irregularity unit shape B (3) or (5) is such that the maximum depth difference from the shape tangent (14) of the unit shape A (1) is ± 1 μm or more. The depth (13) of the fine uneven portion unit shape B (3) or (5) is larger than the shape tangent (14) of the unit shape A (1) because it can be visually recognized as a streak-like defect. It is desirable that the difference in depth is within ± 1 μm.

The optical lens sheet mold will be described.
As shown in FIG. 1, the optical lens sheet mold (6) has a substantially cylindrical shape, and an optical structure forming portion 7 for forming an optical structure is formed on the surface thereof.

A method of forming a lens on the optical lens sheet mold (6) will be described.
Attaching the optical lens sheet mold (6) to a mold processing machine (lens shape forming machine), attaching a cutting tool (8), and processing under desired conditions, the optical lens sheet mold An intaglio to be an optical lens sheet (15) is formed in (6).

  Subsequently, a method for producing the optical lens sheet (15) transferred from the optical lens sheet mold (6) will be described. First, the material of the optical lens sheet (15) will be described.

  As a material for molding the optical lens sheet (15), a material having optical transparency with respect to the wavelength of light emitted from the light source unit is used. For example, a plastic material that can be used for the optical member can be used.

  Examples of this material include polyester resins, acrylic resins, polycarbonate resins, polystyrene resins, MS (acrylic and styrene copolymer) resins, polymethylpentene resins, thermoplastic resins such as cycloolefin polymers, or polyester acrylates and urethanes. Examples thereof include transparent resins such as radiation curable resins made of oligomers such as acrylates and epoxy acrylates, or acrylates.

  The optical lens sheet (15) may have a single layer structure or a multilayer structure, and may include a transparent layer. The optical lens sheet (15) is molded by pouring the material as described above into a mold and solidifying it.

  The optical lens sheet (15) may be manufactured by a UV curing method. When producing by the UV curing method, a UV curable resin is applied onto the base which is a sheet-like base material, a mold having a desired shape is pressed, and then UV irradiation is performed to irradiate the base, the optical protrusion, and the optical An optical lens sheet (15) comprising the elements is obtained. As the sheet-like substrate, PET (polyethylene terephthalate), polycarbonate, acrylic, polypropylene films and the like well known in the art can be used.

  In addition, although the typical preparation example about an optical lens sheet | seat (15) has been demonstrated, if the optical characteristic of this embodiment can be achieved, it can also produce using materials, structures, processes other than the above. Is possible.

  Specific examples of the present invention will be described below.

  (Example 1) In the case of processing the optical lens sheet mold (6) in the circumferential direction, as shown in FIG. 15, the cutting tool 8 is attached to a mold processing machine (lens shape forming machine), Processing is performed while rotating the optical lens sheet mold (6). On the other hand, in the case of machining in the axial direction, as shown in FIG. 16, a cutting tool 8 is attached to a die machining machine (lens shape forming machine), and the optical lens sheet die 6 is machined without rotation. Thus, the prism shape having one or two dimensions shown in FIG. 2 or 4, the cylindrical shape having one or two dimensions shown in FIG. 3 or 5, and the prism shape and cylindrical shape (2 ) The optical lens sheet mold (6) composed of a two-dimensional unit shape A (1) constituted by a pattern was formed. As the setting value, the width (12) of the unit shape B (3) or (5) of the fine uneven portion is set to 0.2 μm so that the width of the unit shape A (2) or (4) is 50 μm, respectively. The maximum depth difference (13) from the shape tangent (14) was 0.2 μm.

  (Example 2) The width (12) of the unit shape B (3) or (5) of the fine concavo-convex part is set to 2.5 μm so that the width of the unit shape A (2) or (4) is 50 μm. The optical lens sheet mold (6) was formed in the same manner as in Example 1 except that the maximum depth difference (13) from the shape tangent (14) was 0.2 μm.

  (Example 3) The width (12) of the unit shape B (3) or (5) of the fine concavo-convex part is 5.0 μm so that the width of the unit shape A (2) or (4) is 50 μm, The optical lens sheet mold (6) was formed in the same manner as in Example 1 except that the maximum depth difference (13) from the shape tangent (14) was 0.2 μm.

  (Example 4) The width (12) of the unit shape B (3) or (5) of the fine concavo-convex portion is 5.0 μm so that the width of the unit shape A (2) or (4) is 50 μm, The optical lens sheet mold (6) was formed in the same manner as in Example 1 except that the maximum depth difference (13) from the shape tangent (14) was 0.2 μm.

(Example 5) The width 12 of the unit shape B (3) or (5) of the fine concavo-convex part is set to 2.5 μm so that the width of the unit shape A (2) or (4) is 50 μm, and the shape tangent (14) The optical lens sheet mold (6) was formed in the same manner as in Example 1 except that the maximum depth difference (13) was 1.0 μm.

  (Example 6) The width 12 of the unit shape B (3) or (5) of the fine irregularities is set to 2.5 μm so that the width of the unit shape A (2) or (4) is 100 μm, and the shape tangent The optical lens sheet mold (6) was formed in the same manner as in Example 1 except that the maximum depth difference (13) from (14) was 1.0 μm.

  (Example 7) The width (12) of the unit shape B (3) or (5) of the fine concavo-convex part is 5.0 μm so that the width of the unit shape A (2) or (4) is 100 μm, The optical lens sheet mold 6 was formed in the same manner as in Example 1 except that the maximum depth difference (13) from the shape tangent (14) was 1.0 μm.

  (Example 8) The width (12) of the unit shape B (3) or (5) of the fine concavo-convex portion is set to 2.5 μm so that the width of the unit shape A (2) or (4) is 200 μm. The optical lens sheet mold (6) was formed in the same manner as in Example 1 except that the maximum depth difference (13) from the shape tangent line (14) was 1.0 μm.

  (Example 9) The width (12) of the unit shape B (3) or (5) of the fine concavo-convex portion is 5.0 μm so that the width of the unit shape A (2) or (4) is 200 μm, The optical lens sheet mold (6) was formed in the same manner as in Example 1 except that the maximum depth difference (13) from the shape tangent (14) was 2.0 μm.

  (Comparative example 1) The width | variety (12) of the unit shape B (3) or (5) of the said fine uneven part shall be 6.0 micrometers so that the width | variety of unit shape A (2) or (4) may be 50 micrometers. The optical lens sheet mold 6 was formed in the same manner as in Example 1 except that the maximum depth difference (13) from the shape tangent (14) was 0.2 μm.

  (Comparative Example 2) As Comparative Example 2, the width (12) of the unit shape B (3) or (5) of the fine concavo-convex part is set so that the width of the unit shape A (2) or (4) is 50 μm. The optical lens sheet mold (6) was formed in the same manner as in Example 1 except that the thickness difference was 2.5 μm and the maximum depth difference (13) from the shape tangent line (14) was 4.0 μm.

  (Comparative Example 3) As Comparative Example 3, the width (12) of the unit shape B (3) or (5) of the fine concavo-convex part is set so that the width of the unit shape A (2) or (4) is 50 μm. The optical lens sheet mold (6) was formed in the same manner as in Example 1 except that the thickness difference was 6.0 μm and the maximum depth difference (13) from the shape tangent line (14) was 4.0 μm.

  Next, a method for producing the optical lens sheet (15) will be described. In this experiment, it was produced by the extrusion method. FIG. 11 shows a schematic diagram of the extruder. The formed optical lens sheet mold (6) was placed in the vicinity of the extruder (9) as a forming roll (10). The thermoplastic polycarbonate resin is melted, molded by an extruder (9), and molded by a forming roll (11) before the thermoplastic polycarbonate optical lens sheet (15) is cooled and cured to have a desired shape. Optical lens sheets (15) were obtained. The thickness of the optical lens sheet (15) was all 320 μm.

  All the optical lens sheets (15) are produced by an extrusion method using a thermoplastic polycarbonate resin. The thermoplastic polycarbonate resin used in the present invention has an elastic modulus E of 2400 MPa and a specific gravity of 1.2 g / cm 3. This optical lens sheet (15) has a very good transfer rate from the optical lens sheet mold (6), and the shaping rate is 99% or more.

  Then, each evaluation method of the obtained optical lens sheet (15) is demonstrated.

  (Evaluation of scratch resistance) In order to confirm the scratch resistance, the scratch resistance was evaluated with a Gakushin type wear fastness tester. The obtained optical lens sheet (15) composed of the unit shape B (3) or (5) of the fine uneven portion is attached to the Gakushin-type wear fastness tester stage, and the optical lens sheet is one-dimensionally or two-dimensionally. A comparative verification experiment was performed by applying a load to steel wool (Bonster) against the convex portion of (15) and rubbing it. The evaluation method by the Gakushin-type wear fastness test is (○) if the optical lens sheet (15) is more excellent in scratch resistance than the conventional optical lens sheet, and (x) if it is inferior. It was. The evaluation results are shown in Table 1.

  (Brightness measurement evaluation) The obtained optical lens sheet (15) having the shape of the fine irregularities 4 was mounted on an LED edge light type liquid crystal television and evaluated by a brightness measuring machine. The liquid crystal television used was a Sony 40-inch liquid crystal television. The light guide plate that is actually mounted is used as it is. On the light guide plate, an optical lens sheet according to an embodiment of the present invention, a prism sheet BEFIII manufactured by Sumitomo 3M, and a retroreflective sheet DBEF manufactured by Sumitomo 3M were sequentially installed. The evaluation method based on the luminance measurement was (◯) when the luminance value of the optical lens sheet (15) was higher than that of the conventional optical lens sheet, and (×) when the luminance value was low. The evaluation results are shown in Table 1.

  (Moire appearance visual inspection) The optical lens sheet (15) composed of the obtained unit shape B (3) or (5) of the fine uneven portion is mounted on an LED edge light type liquid crystal television, and the presence or absence of moire is visually observed. Evaluated by inspection. Since the evaluation method is the presence or absence of moire, it was set as (◯) when it was not visible, and (X) when it was visible. The evaluation results are shown in Table 1.

  In addition, the comprehensive evaluation (◯) evaluation shown in Table 1 shows that the optical lens sheet (15) according to the present invention is superior in scratch resistance and high brightness than the conventional optical lens sheet. In addition, this indicates a state where moire cannot be visually recognized. That is, the range in which the effect of the present invention is obtained is shown.

  It is a list of results of scratch resistance evaluation, luminance evaluation, and moire appearance visual evaluation. Therefore, since the evaluation result shown in Table 1 is (○) is an effective value of the present invention, the claimed value was determined.

  In the embodiment, the width (12) or the depth (13) of the fine irregularity unit shape B (3) or (5) 3 is formed at a constant interval, but the present invention needs to have a constant arrangement. Absent. Specific examples include unequal arrangement and randomness.

1 Unit shape A
2 Prism shape 3 Fine uneven portion 4 Cylindrical shape 5 Unit shape B of fine uneven portion
6 Optical Lens Sheet Mold 7 Optical Structure Forming Section 8 Cutting Tool 9 Extruder 10 Forming Roll 11 Forming Roll 12 Width 13 Depth 14 Shape Tangent 15 Optical Lens Sheet 16 Light Guide Plate 17 Ejection Surface 18 Light Deflection Surface 19 Light Source 20 Light deflection element 21 Light source 22 Liquid crystal panel 23 BEF
24 Base material 25 Prism 26 Diffusion sheet 27 Optical lens sheet

Claims (7)

A mold for manufacturing an optical lens sheet for controlling an illumination optical path from a light source of a display,
The surface of the mold has a repeating pattern of uneven unit shapes A,
The entire surface of the unit shape A, along its surface, characterized in that those are formed so as repeating pattern of units shape B fine fine uneven portions than the width of the unit shape A covers Mold for manufacturing optical lens sheet for illumination light path control.   2. The mold for manufacturing an optical lens sheet for controlling an illumination optical path according to claim 1, wherein the width of the unit shape B of the fine uneven portion is a fine uneven portion having a size of 0.2 μm or more and 5 μm or less. Claim 1, wherein the maximum difference of apexes of the convex portions of the unit shape B of the fine concave-convex portion, or the maximum difference between the lower ends of the recess of the unit shape B is, 0.2 [mu] m or more, and wherein the at 2μm or less Or the metal mold | die for manufacture of the optical lens sheet for illumination optical path control of 2.   An optical lens sheet for controlling an illumination optical path is manufactured using the mold for manufacturing an optical lens sheet for controlling an optical path of illumination according to any one of claims 1 to 3. Method.   An optical lens sheet for illumination light path control manufactured using the mold for producing an optical lens sheet for illumination light path control according to any one of claims 1 to 3.   A liquid crystal display device on which the illumination optical path controlling optical lens sheet according to claim 4 is mounted. A display comprising the liquid crystal display device according to claim 6.