Lighting device

Abstract

The illumination device includes a light emitting module; and an optical element in which a first liquid crystal cell and a second liquid crystal cell are stacked to transmit light from the light emitting module, the first liquid crystal cell and the second liquid crystal cell including a first substrate in which a first transparent electrode and a second transparent electrode are alternately arranged in a first direction, and a second substrate in which a third transparent electrode and a fourth transparent electrode are alternately arranged in a second direction intersecting the first direction, the light emitting module including a light source, a light guide plate including an end surface on which light from the light source is incident and a first surface from which the incident light is emitted, and a prism sheet arranged opposite the first surface, the second substrate of the first liquid crystal cell being adjacent to the first substrate of the second liquid crystal cell, the first surface including a plurality of first grooves extending in a third direction intersecting the first direction and the second direction.

Description

Technical Field

[0001] One embodiment of the present invention relates to a lighting device. Background Technology

[0002] Previously, optical elements that utilize changes in the refractive index of a liquid crystal to adjust the voltage applied to it, known as liquid crystal lenses (see, for example, Patent Document 1, Patent Document 2, or Patent Document 3). For example, the illumination devices described in Patent Document 1 and Patent Document 2 use liquid crystal lenses to distribute light from a light source into a circular shape. Furthermore, in the beam shaping device described in Patent Document 3, the light distribution shape is changed by altering the pattern of the electrodes applied to the liquid crystal.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2005-317879

[0006] Patent Document 2: Japanese Patent Application Publication No. 2010-230887

[0007] Patent Document 3: Japanese Patent Application Publication No. 2014-160277 Summary of the Invention

[0008] The technical problem that the invention aims to solve

[0009] The light distribution pattern of light passing through the liquid crystal lens also varies depending on the structure of the light-emitting module, including the light source. Therefore, an illumination device including optical elements is needed that is compatible with all light-emitting modules.

[0010] In view of the above-mentioned problems, one of the objectives of this invention is to provide an illumination device capable of correcting the light distribution shape according to the structure of the light-emitting module.

[0011] Technical solutions for solving technical problems

[0012] An embodiment of the present invention relates to a lighting device comprising: an optical element having a first liquid crystal cell and a second liquid crystal cell stacked thereon, and allowing light irradiated from a light-emitting module to pass through; the first liquid crystal cell and the second liquid crystal cell each comprising: a first substrate having a first transparent electrode and a second transparent electrode alternately arranged in a first direction; and a second substrate having a third transparent electrode and a fourth transparent electrode alternately arranged in a second direction intersecting the first direction; the light-emitting module comprising: a light source; a light guide plate having an end face into which light irradiated from the light source is incident and a first surface out which the incident light is emitted; and a prism sheet disposed opposite to the first surface; the second substrate of the first liquid crystal cell being adjacent to the first substrate of the second liquid crystal cell; the first surface including a plurality of first grooves extending upward in a third direction intersecting the first and second directions.

[0013] In addition, one embodiment of the present invention relates to a lighting device including: a light-emitting module; and an optical element having a first liquid crystal unit and a second liquid crystal unit stacked thereon, and allowing light irradiated from the light-emitting module to pass through. The first liquid crystal unit and the second liquid crystal unit each include: a first substrate having a first transparent electrode and a second transparent electrode alternately arranged in a first direction; and a second substrate having a third transparent electrode and a fourth transparent electrode alternately arranged in a second direction intersecting the first direction. The light-emitting module includes: a light source; and a reflector disposed around the light source and reflecting light irradiated from the light source. The second substrate of the first liquid crystal unit is adjacent to the first substrate of the second liquid crystal unit. Attached Figure Description

[0014] Figure 1A This is a schematic exploded perspective view of a lighting device according to one embodiment of the present invention.

[0015] Figure 1B This is a partially enlarged view illustrating the light-emitting module of a lighting device according to one embodiment of the present invention.

[0016] Figure 1C This is a block diagram illustrating a lighting device according to one embodiment of the present invention.

[0017] Figure 2A This is a schematic perspective view of the optical elements of a lighting device according to one embodiment of the present invention.

[0018] Figure 2B This is a schematic cross-sectional view of the optical element of a lighting device according to one embodiment of the present invention.

[0019] Figure 2C This is a schematic cross-sectional view of the optical element of a lighting device according to one embodiment of the present invention.

[0020] Figure 3AThis is a schematic cross-sectional view illustrating the light distribution control of an optical element of an illumination device according to one embodiment of the present invention.

[0021] Figure 3B This is a schematic cross-sectional view illustrating the light distribution control of an optical element of an illumination device according to one embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram illustrating the relationship between the optical elements and the light-emitting module of a lighting device according to one embodiment of the present invention.

[0023] Figure 5 This is a schematic diagram illustrating the light distribution shape before and after correction in a lighting device according to one embodiment of the present invention.

[0024] Figure 6 This is a schematic diagram illustrating the relationship between the optical elements and the light-emitting module of a lighting device according to one embodiment of the present invention.

[0025] Figure 7A This is a schematic diagram illustrating the light distribution shape before and after correction in a lighting device according to one embodiment of the present invention.

[0026] Figure 7B This is a schematic diagram illustrating the light distribution shape before and after correction in a lighting device according to one embodiment of the present invention.

[0027] Figure 7C This is a schematic diagram illustrating the light distribution shape before and after correction in a lighting device according to one embodiment of the present invention.

[0028] Figure 8 This is a schematic exploded perspective view of a lighting device according to one embodiment of the present invention.

[0029] Figure 9A It is a measurement result of the light distribution shape of the light emitted from the lighting device 10B according to one embodiment of the present invention.

[0030] Figure 9B It is a measurement result of the light distribution shape of the light emitted from the lighting device 10B according to one embodiment of the present invention.

[0031] Figure 9C It is a measurement result of the light distribution shape of the light emitted from the lighting device 10B according to one embodiment of the present invention. Detailed Implementation

[0032] Hereinafter, various embodiments of the present invention will be described with reference to the accompanying drawings, etc. However, the present invention can be implemented in various ways without departing from its technical spirit and is not limited to the description of the embodiments illustrated below.

[0033] To make the description clearer, the accompanying drawings sometimes schematically represent the width, thickness, shape, etc. of various parts compared to the actual representation. However, these are merely examples, and the shapes shown in the drawings do not limit the interpretation of the invention. Furthermore, in the accompanying drawings, elements having the same function as those described in the figures already presented in the specification are also labeled with the same reference numerals in other figures, sometimes omitting repeated descriptions.

[0034] When processing a single membrane to form multiple structures, these structures may have different functions and roles. Furthermore, the substrates forming these structures may differ. However, these multiple structures originate from a membrane formed as the same layer in the same process and are made of the same material. Therefore, they are defined as existing within the same layer.

[0035] When describing the way in which other structures are placed on top of a certain structure, if only described as "above", unless otherwise specified, it is assumed to include two cases: the case where other structures are placed directly above a certain structure, and the case where other structures are placed above a certain structure, separated by other structures.

[0036] Reference Figures 1A to 5 The lighting device 10 according to one embodiment of the present invention will be described.

[0037] [1. Structure of the lighting device 10]

[0038] Figure 1A This is a schematic exploded perspective view of a lighting device 10 according to one embodiment of the present invention. Figure 1A As shown, the lighting device 10 includes an optical element 100, a light-emitting module 200, and a control unit 300. The light-emitting module 200 includes a metal frame 210, a reflector 220, a resin frame 230, a light source substrate 240, a light guide plate 250, a prism sheet 260, a pad 270, and light-shielding double-sided adhesive tape 280. The reflector 220, resin frame 230, light source substrate 240, light guide plate 250, and prism sheet 260 are disposed within a space surrounded by the metal frame 210 and the pad 270. The pad 270 has an opening for light transmission. Furthermore, light-shielding double-sided adhesive tape 280 is provided on the pad 270, and the pad 270 and the optical element 100 are bonded together via the light-shielding double-sided adhesive tape 280. The control unit 300 can be disposed outside or inside the light-emitting module 200.

[0039] Figure 1B This is a partially enlarged view illustrating the light-emitting module 200 of a lighting device 10 according to one embodiment of the present invention. A plurality of first grooves 252 extending in the x-axis direction are provided on a first surface of a light guide plate 250. A plurality of second grooves 254 extending in the y-axis direction are formed on a second surface opposite to the first surface of the light guide plate 250. The cross-sectional shape of each of the first grooves 252 and the second grooves 254 is an isosceles triangle. In other words, a convex portion with an isosceles triangular cross-sectional shape is provided on both the first and second surfaces of the light guide plate 250. The apex angle of the convex portion on the first surface is, for example, 98°, and the apex angle of the convex portion on the second surface is, for example, 177°. However, the angle of the apex angle is not limited to these values. Furthermore, the cross-sectional shape of the convex portion is not limited to an isosceles triangle; it can also be a semi-circular shape.

[0040] A prism sheet 260 is disposed opposite to the first surface of the light guide plate 250. A reflector sheet 220 is disposed opposite to the second surface of the light guide plate 250. Furthermore, a light source substrate 240 is disposed at the end face of the light guide plate 250. An LED (Light Emitting Diode) element 242 is mounted on the light source substrate 240 as a light source. Light emitted from the LED element 242 enters from the end face of the light guide plate 250, and after reflection based on the reflector sheet 220 and refraction based on the light guide plate 250, exits from the first surface of the light guide plate 250.

[0041] A plurality of grooves 262 extending in the y-axis direction are provided on the surface of the prism sheet 260 opposite to the first surface of the light guide plate 250. The cross-sectional shape of the grooves 262 is an isosceles triangle. In other words, a triangular prism (prism) extending in the y-axis direction is provided on the surface of the prism sheet 260. The vertex angle of the isosceles triangle of the cross-sectional shape of the triangular prism is, for example, 68°. Light emitted from the first surface of the light guide plate 250 enters from the surface of the prism sheet 260 where the triangular prism is formed and exits as collimated light from the opposite surface.

[0042] The light-emitting module 200 is a so-called edge light source. That is, the light-emitting module 200 can convert the light emitted from the LED element 242 into collimated light and illuminate the optical element 100 with collimated light. It should be noted that the light distribution of this collimated light can be appropriately adjusted by the shape or combination of the slots of the light guide plate and the prism sheet. Specifically, it is also possible to use a method of illuminating light in a planar manner throughout the light-emitting area divided by the light-shielding double-sided tape 280. Alternatively, it is also possible to use a method of illuminating only the center of the light-emitting area. With this light-emitting module, the light source can be made thinner.

[0043] Figure 1C This is a block diagram illustrating a lighting device 10 according to one embodiment of the present invention. Figure 1CAs shown, in the lighting device 10, the control unit 300 is electrically connected to the optical element 100 and the light-emitting module 200, and is capable of controlling the optical element 100 and the light-emitting module 200. In addition, the control unit 300 includes a signal processing unit 310 and a storage unit 320.

[0044] The signal processing unit 310 is a computer capable of performing calculations and processing using data or information. The signal processing unit 310 may include, for example, a central processing unit (CPU), a microprocessor (MPU), or random access memory (RAM). Specifically, the signal processing unit 310 can execute predetermined functions by loading a program.

[0045] Storage unit 320 is a memory capable of storing data or information. As storage unit 320, for example, a hard disk drive (HDD), a solid-state drive (SSD), a read-only memory (ROM), random access memory (RAM), or flash memory can be used. Furthermore, storage unit 320 includes a list 322 that stores the values ​​of the potentials supplied to the optical element 100 to correct the light distribution pattern of the light irradiated from the light-emitting module 200. It should be noted that the correction of the light distribution pattern will be described later.

[0046] The control unit 300 can communicate with the user's information terminal 900 via a network NW. The network NW can be wired or wireless. For example, the network NW is a LAN (Local Area Network) or the Internet, but is not limited to these. In addition, the information terminal 900 is, for example, a mobile phone, a smartphone, a tablet, or a personal computer, but is not limited to these.

[0047] The lighting device 10 can be controlled via the operation of the information terminal 900. Specifically, if the lighting device 10 receives a request signal from the information terminal 900, the signal processing unit 310 of the control unit 300 controls the optical element 100 or the light-emitting module 200 based on the received request signal. The request signal may be, for example, a signal related to adjusting the brightness of the lighting device 10 (the brightness of the light-emitting module 200), or a signal related to the light distribution pattern of the light emitted from the lighting device 10. When a request signal related to adjusting the brightness of the lighting device 10 is received, the signal processing unit 310 adjusts the current supplied to the LED element 242. When a request signal related to the light distribution pattern of the light emitted from the lighting device is received, the signal processing unit 310 controls the potential supplied to the optical element 100.

[0048] In the lighting device 10, light emanating from the light-emitting module 200 is emitted to the outside via the optical element 100. Therefore, the optical element 100 will be described below.

[0049] [2. Structure of optical element 100]

[0050] Figure 2A This is a schematic perspective view of the optical element 100 of a lighting device 10 according to one embodiment of the present invention. Figure 2A As shown, the optical element 100 includes a first liquid crystal unit 110-1, a second liquid crystal unit 110-2, a third liquid crystal unit 110-3, and a fourth liquid crystal unit 110-4. The first liquid crystal unit 110-1, the second liquid crystal unit 110-2, the third liquid crystal unit 110-3, and the fourth liquid crystal unit 110-4 are stacked along the z-axis. The second liquid crystal unit 110-2 is disposed on the first liquid crystal unit 110-1. The third liquid crystal unit 110-3 is disposed on the second liquid crystal unit 110-2. The fourth liquid crystal unit 110-4 is disposed on the third liquid crystal unit 110-3. Light emitted from the light-emitting module 200 passes sequentially through the first liquid crystal unit 110-1, the second liquid crystal unit 110-2, the third liquid crystal unit 110-3, and the fourth liquid crystal unit 110-4.

[0051] The first optically elastic resin layer 170-1 bonds and fixes the first liquid crystal unit 110-1 and the second liquid crystal unit 110-2. The second optically elastic resin layer 170-2 bonds and fixes the second liquid crystal unit 110-2 and the third liquid crystal unit 110-3. The third optically elastic resin layer 170-3 bonds and fixes the third liquid crystal unit 110-3 and the fourth liquid crystal unit 110-4. Each of the first optically elastic resin layer 170-1, the second optically elastic resin layer 170-2, and the third optically elastic resin layer 170-3 can be bonded with an adhesive including a light-transmitting acrylic resin or epoxy resin.

[0052] Figure 2B as well as Figure 2C This is a schematic cross-sectional view of the optical element 100 of the lighting device 10 according to one embodiment of the present invention. Specifically, Figure 2B It is along Figure 2A A schematic cross-sectional view of the optical element 100 cut off along line A1-A2, as shown. Figure 2C It is along Figure 2AThe diagram shows a schematic cross-sectional view of the optical element 100 cut off along line B1-B2. It should be noted that, for convenience, the direction parallel to line A1-A2 will be designated as the first direction, and the direction parallel to line B1-B2 will be designated as the second direction. The first and second directions intersect each other at 90°, and intersect the x-axis and y-axis directions at 45° and 135° respectively. It should also be noted that, for convenience, the x-axis and y-axis directions will be designated as the third and fourth directions, respectively. That is, the third and fourth directions intersect each other at 90°.

[0053] The angle between the first and second directions is not limited to 90°; it can also be approximately 90°. For example, approximately 90° means 90° ± 10°. Furthermore, the angles between the first and third or fourth directions, and between the second and third or fourth directions, are not limited to 45° or 135°; they can also be approximately 45° or approximately 135°. For example, approximately 45° means 45° ± 10°, and approximately 135° means 135° ± 10°.

[0054] The first liquid crystal unit 110-1 includes a first substrate 120-1 having a first transparent electrode 130-1 and a second transparent electrode 130-2, and a second substrate 120-2 having a third transparent electrode 130-3 and a fourth transparent electrode 130-4. A first alignment film 140-1 covering the first transparent electrode 130-1 and the second transparent electrode 130-2 is formed on the first substrate 120-1. A second alignment film 140-2 covering the third transparent electrode 130-3 and the fourth transparent electrode 130-4 is formed on the second substrate 120-2. The first substrate 120-1 and the second substrate 120-2 are configured such that the first transparent electrode 130-1 and the second transparent electrode 130-2 on the first substrate 120-1 face the third transparent electrode 130-3 and the fourth transparent electrode 130-4 on the second substrate 120-2. A first sealing material 150-1 is formed at the periphery of each of the first substrate 120-1 and the second substrate 120-2. That is, the first substrate 120-1 and the second substrate 120-2 are bonded together via the first sealing material 150-1. In addition, liquid crystal is sealed in the space surrounded by the first substrate 120-1 (more specifically, the first alignment film 140-1), the second substrate 120-2 (more specifically, the second alignment film 140-2), and the first sealing material 150-1 to form a first liquid crystal layer 160-1.

[0055] The second liquid crystal unit 110-2 includes a third substrate 120-3 on which a fifth transparent electrode 130-5 and a sixth transparent electrode 130-6 are formed, and a fourth substrate 120-4 on which a seventh transparent electrode 130-7 and an eighth transparent electrode 130-8 are formed. A third alignment film 140-3 covering the fifth transparent electrode 130-5 and the sixth transparent electrode 130-6 is formed on the third substrate 120-3. A fourth alignment film 140-4 covering the seventh transparent electrode 130-7 and the eighth transparent electrode 130-8 is formed on the fourth substrate 120-4. The third substrate 120-3 and the fourth substrate 120-4 are configured such that the fifth transparent electrode 130-5 and the sixth transparent electrode 130-6 on the third substrate 120-3 face the seventh transparent electrode 130-7 and the eighth transparent electrode 130-8 on the fourth substrate 120-4. Furthermore, a second sealing material 150-2 is formed on the periphery of both the third substrate 120-3 and the fourth substrate 120-4. That is, the third substrate 120-3 and the fourth substrate 120-4 are bonded together via the second sealing material 150-2. In addition, liquid crystal is sealed into the space surrounded by the third substrate 120-3 (more specifically, the third alignment film 140-3), the fourth substrate 120-4 (more specifically, the fourth alignment film 140-4), and the second sealing material 150-2 to form a second liquid crystal layer 160-2.

[0056] The third liquid crystal unit 110-3 includes a fifth substrate 120-5 on which a ninth transparent electrode 130-9 and a tenth transparent electrode 130-10 are formed, and a sixth substrate 120-6 on which an eleventh transparent electrode 130-11 and a twelfth transparent electrode 130-12 are formed. A fifth alignment film 140-5 covering the ninth transparent electrode 130-9 and the tenth transparent electrode 130-10 is formed on the fifth substrate 120-5. A sixth alignment film 140-6 covering the eleventh transparent electrode 130-11 and the twelfth transparent electrode 130-12 is formed on the sixth substrate 120-6. The fifth substrate 120-5 and the sixth substrate 120-6 are configured such that the ninth transparent electrode 130-9 and the tenth transparent electrode 130-10 on the fifth substrate 120-5 face the eleventh transparent electrode 130-11 and the twelfth transparent electrode 130-12 on the sixth substrate 120-6. Furthermore, a third sealing material 150-3 is formed on the periphery of both the fifth substrate 120-5 and the sixth substrate 120-6. That is, the fifth substrate 120-5 and the sixth substrate 120-6 are bonded together via the third sealing material 150-3. In addition, liquid crystal is sealed into the space surrounded by the fifth substrate 120-5 (more specifically, the fifth alignment film 140-5), the sixth substrate 120-6 (more specifically, the sixth alignment film 140-6), and the third sealing material 150-3 to form a third liquid crystal layer 160-3.

[0057] The fourth liquid crystal cell 110-4 includes a seventh substrate 120-7 having a thirteenth transparent electrode 130-13 and a fourteenth transparent electrode 130-14, and an eighth substrate 120-8 having a fifteenth transparent electrode 130-15 and a sixteenth transparent electrode 130-16. A seventh alignment film 140-7 covering the thirteenth transparent electrode 130-13 and the fourteenth transparent electrode 130-14 is formed on the seventh substrate 120-7. An eighth alignment film 140-8 covering the fifteenth transparent electrode 130-15 and the sixteenth transparent electrode 130-16 is formed on the eighth substrate 120-8. The seventh substrate 120-7 and the eighth substrate 120-8 are configured such that the thirteenth transparent electrode 130-13 and the fourteenth transparent electrode 130-14 on the seventh substrate 120-7 face the fifteenth transparent electrode 130-15 and the sixteenth transparent electrode 130-16 on the eighth substrate 120-8. Furthermore, a fourth sealing material 150-4 is formed on the periphery of both the seventh substrate 120-7 and the eighth substrate 120-8. That is, the seventh substrate 120-7 and the eighth substrate 120-8 are bonded together via the fourth sealing material 150-4. In addition, liquid crystal is sealed into the space surrounded by the seventh substrate 120-7 (more specifically, the seventh alignment film 140-7), the eighth substrate 120-8 (more specifically, the eighth alignment film 140-8), and the fourth sealing material 150-4 to form a fourth liquid crystal layer 160-4.

[0058] The basic structures of the first liquid crystal unit 110-1, the second liquid crystal unit 110-2, the third liquid crystal unit 110-3, and the fourth liquid crystal unit 110-4 are the same. However, the configuration of the transparent electrode 130 is different.

[0059] In the first liquid crystal cell 110-1, a first transparent electrode 130-1 and a second transparent electrode 130-2 extend in a second direction, while a third transparent electrode 130-3 and a fourth transparent electrode 130-4 extend in the first direction. Furthermore, the first transparent electrode 130-1 and the second transparent electrode 130-2 are alternately arranged in a comb-like pattern in the first direction, and the third transparent electrode 130-3 and the fourth transparent electrode 130-4 are alternately arranged in a comb-like pattern in the second direction. When viewed from above, the extending directions (second direction) of the first transparent electrode 130-1 and the second transparent electrode 130-2 are orthogonal to the extending directions (first direction) of the third transparent electrode 130-3 and the fourth transparent electrode 130-4, but they may also be slightly offset (approximately 90°).

[0060] In the second liquid crystal cell 110-2, the fifth transparent electrode 130-5 and the sixth transparent electrode 130-6 extend in the second direction, while the seventh transparent electrode 130-7 and the eighth transparent electrode 130-8 extend in the first direction. Furthermore, the fifth transparent electrode 130-5 and the sixth transparent electrode 130-6 are alternately arranged in a comb-like shape in the first direction, and the seventh transparent electrode 130-7 and the eighth transparent electrode 130-8 are alternately arranged in a comb-like shape in the second direction. When viewed from above, the extending directions (second direction) of the fifth transparent electrode 130-5 and the sixth transparent electrode 130-6 are orthogonal to the extending directions (first direction) of the seventh transparent electrode 130-7 and the eighth transparent electrode 130-8, but they may also be slightly offset (approximately 90°).

[0061] In the third liquid crystal cell 110-3, the ninth transparent electrode 130-9 and the tenth transparent electrode 130-10 extend in a first direction, while the eleventh transparent electrode 130-11 and the twelfth transparent electrode 130-12 extend in a second direction. Furthermore, the ninth transparent electrode 130-9 and the tenth transparent electrode 130-10 are alternately arranged in a comb-like pattern in the second direction, while the eleventh transparent electrode 130-11 and the twelfth transparent electrode 130-12 are alternately arranged in a comb-like pattern in the first direction. When viewed from above, the extending directions (first direction) of the ninth transparent electrode 130-9 and the tenth transparent electrode 130-10 are orthogonal to the extending directions (second direction) of the eleventh transparent electrode 130-11 and the twelfth transparent electrode 130-12, but they may also be slightly offset (approximately 90°).

[0062] In the fourth liquid crystal cell 110-4, the thirteenth transparent electrode 130-13 and the fourteenth transparent electrode 130-14 extend in a first direction, and the fifteenth transparent electrode 130-15 and the sixteenth transparent electrode 130-16 extend in a second direction. Furthermore, the thirteenth and fourteenth transparent electrodes 130-13 and 130-14 are alternately arranged in a comb-like pattern in the second direction, while the fifteenth and sixteenth transparent electrodes 130-15 and 130-16 are alternately arranged in a comb-like pattern in the first direction. When viewed from above, the extending directions (first direction) of the thirteenth and fourteenth transparent electrodes 130-13 and 130-14 are orthogonal to the extending directions (second direction) of the fifteenth and sixteenth transparent electrodes 130-15 and 130-16, but they may also be slightly offset (approximately 90°).

[0063] Viewed from above, the first transparent electrode 130-1, the fifth transparent electrode 130-5, the eleventh transparent electrode 130-11, and the fifteenth transparent electrode 130-15 overlap in a manner that is generally consistent with each other in the extending direction (second direction). The other transparent electrodes 130 are also arranged in the same way. However, the first liquid crystal unit 110-1 to the fourth liquid crystal unit 110-4 can also be arranged in a manner that slightly offsets the first transparent electrode 130-1, the fifth transparent electrode 130-5, the eleventh transparent electrode 130-11, and the fifteenth transparent electrode 130-15.

[0064] Each of the first substrate 120-1 to the eighth substrate 120-8 is a rigid substrate that is transparent to light, such as a glass substrate, a quartz substrate, or a sapphire substrate. Alternatively, each of the first substrate 120-1 to the eighth substrate 120-8 may be a flexible substrate that is transparent to light, such as a polyimide resin substrate, an acrylic resin substrate, a silicone resin substrate, or a fluoropolymer substrate.

[0065] The first transparent electrode 130-1 to the sixteenth transparent electrode 130-16 function as electrodes for forming an electric field in the liquid crystal layer 160. Each of the first transparent electrode 130-1 to the sixteenth transparent electrode 130-16 is made of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO).

[0066] The first liquid crystal layer 160-1 to the fourth liquid crystal layer 160-4 can refract transmitted light or change the polarization state of transmitted light according to the orientation state of the liquid crystal molecules. Nematic liquid crystals or the like are used as the liquid crystals for each of the first liquid crystal layer 160-1 to the fourth liquid crystal layer 160-4. The liquid crystal described in this embodiment is positive, but a negative structure can also be applied by changing the initial orientation direction of the liquid crystal molecules. Furthermore, it is preferable to contain a chiral agent that imparts twisting to the liquid crystal molecules in the liquid crystal.

[0067] The first alignment film 140-1 to the eighth alignment film 140-8 align liquid crystal molecules within the liquid crystal layer 160 in a predetermined direction. Each of the first alignment film 140-1 to the eighth alignment film 140-8 uses a polyimide resin or the like. It should be noted that the first alignment film 140-1 to the eighth alignment film 140-8 may also be given alignment characteristics through alignment treatments such as rubbing or photoalignment. Rubbing is a method of rubbing the surface of the alignment film in one direction. Photoalignment involves irradiating the alignment film with linearly polarized ultraviolet light.

[0068] Each of the first sealing material 150-1 to the fourth sealing material 150-4 uses an adhesive material including epoxy resin or acrylic resin. It should be noted that the adhesive material can be either UV-curable or thermosetting.

[0069] The optical element 100 includes at least two liquid crystal units (e.g., a first liquid crystal unit 110-1 and a second liquid crystal unit 110-2), thereby enabling control over the distribution of unpolarized light. Therefore, it is not necessary to provide, for example, a pair of polarizing plates disposed on the back surface of the liquid crystal display element, on the surfaces of the first substrate 120-1 of the first liquid crystal unit 110-1 and the eighth substrate 120-8 of the fourth liquid crystal unit 110-4.

[0070] [3. Control of light distribution based on optical element 100]

[0071] Figure 3A as well as Figure 3B This is a schematic cross-sectional view illustrating the control of light distribution of the optical element 100 of the lighting device 10 according to one embodiment of the present invention. Figure 3A as well as Figure 3B It shows Figure 2B A portion of the cross-sectional view of the first liquid crystal unit 110-1 and the second liquid crystal unit 110-2 shown. Figure 3A The optical element 100 is shown in a state where no potential is supplied to the transparent electrode 130. Figure 3B An optical element 100 is shown in a state where a potential is supplied to a transparent electrode 130.

[0072] The first orientation film 140-1 is oriented in a first direction. Therefore, as... Figure 3A As shown, the long axis of the liquid crystal molecules on the first substrate 120-1 side of the first liquid crystal layer 160-1 is aligned along a first direction. That is, the alignment direction of the liquid crystal molecules on the first substrate 120-1 side intersects the extending direction (second direction) of the first transparent electrode 130-1 and the second transparent electrode 130-2. Furthermore, the second alignment film 140-2 is aligned in the second direction. Therefore, as... Figure 3A As shown, the long axis of the liquid crystal molecules on the second substrate 120-2 side of the first liquid crystal layer 160-1 is oriented along a second direction. That is, the orientation direction of the liquid crystal molecules on the second substrate 120-2 side intersects the extending direction (first direction) of the third transparent electrode 130-3 and the fourth transparent electrode 130-4. Therefore, as the liquid crystal molecules of the first liquid crystal layer 160-1 move from the first substrate 120-1 toward the second substrate 120-2, the orientation of their long axis gradually changes from the first direction to the second direction, oriented in a state of 90-degree twist.

[0073] The liquid crystal molecules in the second liquid crystal layer 160-2 are the same as those in the first liquid crystal layer 160-1, so the description is omitted here.

[0074] If a potential is supplied to the transparent electrode 130, then as Figure 3B As shown, the orientation of the liquid crystal molecules changes. Here, we will describe the case where a Low potential is supplied to the first transparent electrode 130-1, the third transparent electrode 130-3, the fifth transparent electrode 130-5, and the seventh transparent electrode 130-7, and a High potential is supplied to the second transparent electrode 130-2, the fourth transparent electrode 130-4, the sixth transparent electrode 130-6, and the eighth transparent electrode 130-8. It should be noted that... Figure 3B For convenience, the Low potential and High potential are illustrated using "-" and "+" symbols, respectively. It should be noted that the electric field generated between adjacent transparent electrodes is sometimes referred to as the transverse electric field.

[0075] like Figure 3B As shown, due to the influence of the lateral electric field between the first transparent electrode 130-1 and the second transparent electrode 130-2, the liquid crystal molecules on the first substrate 120-1 side are oriented in an arc shape convex in the first direction relative to the first substrate 120-1. Similarly, due to the influence of the lateral electric field between the third transparent electrode 130-3 and the fourth transparent electrode 130-4, the liquid crystal molecules on the second substrate 120-2 side are oriented in an arc shape convex in the second direction relative to the second substrate 120-2. The orientation of the liquid crystal molecules located approximately in the center between the first transparent electrode 130-1 and the second transparent electrode 130-2 hardly changes due to any lateral electric field. Therefore, light incident on the first liquid crystal layer 160-1 diffuses in the first direction according to the refractive index distribution of the liquid crystal molecules oriented in an arc shape convex in the first direction on the first substrate 120-1 side, and diffuses in the second direction according to the refractive index distribution of the liquid crystal molecules oriented in an arc shape convex in the second direction on the second substrate 120-2 side.

[0076] It should be noted that, since the first substrate 120-1 and the second substrate 120-2 have a sufficiently separated inter-substrate distance, the lateral electric field between the first transparent electrode 130-1 and the second transparent electrode 130-2 of the first substrate 120-1 will not affect the orientation of the liquid crystal molecules on the second substrate 120-2 side, or its effect is negligible. Similarly, the lateral electric field between the third transparent electrode 130-3 and the fourth transparent electrode 130-4 of the second substrate 120-2 will not affect the orientation of the liquid crystal molecules on the first substrate 120-1 side, or its effect is negligible.

[0077] When a potential is supplied to the fifth transparent electrode 130-5 to the eighth transparent electrode 130-8, the liquid crystal molecules of the second liquid crystal layer 160-2 are the same as those of the first liquid crystal layer 160-1, so the description is omitted here.

[0078] Next, the light distribution of the light transmitted through the optical element 100 will be explained. The light emitted from the light source has a first-direction polarized component (P-polarized component) and a second-direction polarized component (S-polarized component), but for convenience, the light will be described below as having both P-polarized and S-polarized components. That is, the light emitted from the light source (refer to...) Figure 3A as well as Figure 3B (1) includes first polarized light 510 with P-polarized light component and second polarized light 520 with S-polarized light component. It should be noted that... Figure 3A as well as Figure 3B The arrows and crosses in the circles represent the P-polarized and S-polarized light components, respectively.

[0079] After the first polarized light 510 is incident on the first substrate 120-1, as it moves toward the second substrate 120-2, its polarized composition changes from P-polarized to S-polarized due to the twisting of the liquid crystal molecules' orientation (see reference). Figure 3A as well as Figure 3B (2) to (4)). More specifically, the first polarized light 510 has a polarization axis in the x-axis direction on the first substrate 120-1 side, but its polarization axis gradually changes as it passes through the thickness direction of the first liquid crystal layer 160-1, and has a polarization axis in the y-axis direction on the second substrate 120-2 side, and then exits from the second substrate 120-2 side (refer to...). Figure 3A as well as Figure 3B (5) in the middle.

[0080] Here, if a transverse electric field is generated between the first transparent electrode 130-1 and the second transparent electrode 130-2, the liquid crystal molecules on the first substrate 120-1 side will be oriented into an arc shape convex in the first direction due to the influence of this transverse electric field, and the refractive index distribution will change. Therefore, the first polarized light 510 will diffuse in the first direction according to the refractive index distribution of the liquid crystal molecules. Furthermore, if a transverse electric field is generated between the third transparent electrode 130-3 and the fourth transparent electrode 130-4, the liquid crystal molecules on the second substrate 120-2 side will be oriented into an arc shape convex in the second direction due to the influence of this transverse electric field, and the refractive index distribution will change. Therefore, the first polarized light 510 will diffuse in the second direction according to the change in the refractive index distribution of the liquid crystal molecules.

[0081] Therefore, in the absence of a transverse electric field (refer to...) Figure 3AThe polarization composition of the first polarized light 510 transmitted through the first liquid crystal cell 110-1 changes from P-polarized to S-polarized. On the other hand, in the case of generating a transverse electric field (see...), Figure 3B The polarization component of the first polarized light 510 transmitted through the first liquid crystal unit changes from P polarization component to S polarization component and diffuses in the first direction and the second direction.

[0082] After the second polarized light 520 is incident on the first substrate 120-1, as it moves toward the second substrate 120-2, its polarized composition changes from S-polarized to P-polarized due to the twisting of the liquid crystal molecules' orientation (see reference). Figure 3A as well as Figure 3B (2) to (4)). More specifically, the second polarized light 520 has a polarization axis in the second direction on the first substrate 120-1 side, but its polarization axis gradually changes as it passes through the thickness direction of the first liquid crystal layer 160-1, and has a polarization axis in the first direction on the second substrate 120-2 side, and then exits from the second substrate 120-2 side (refer to...). Figure 3A as well as Figure 3B (5) in the middle.

[0083] Here, if a transverse electric field is generated between the first transparent electrode 130-1 and the second transparent electrode 130-2, the liquid crystal molecules on the first substrate 120-1 side will be oriented into an arc shape convex in the first direction due to the influence of this transverse electric field, and the refractive index distribution will change. However, since the polarization axis of the second polarized light 520 is orthogonal to the orientation of the liquid crystal molecules on the first substrate 120-1 side, it is not affected by the refractive index distribution of the liquid crystal molecules and passes directly without diffusion. Similarly, if a transverse electric field is generated between the third transparent electrode 130-3 and the fourth transparent electrode 130-4, the liquid crystal molecules on the second substrate 120-2 side will be oriented into an arc shape convex in the second direction due to the influence of this transverse electric field, and the refractive index distribution will change. However, since the polarization axis of the second polarized light 520 is orthogonal to the orientation of the liquid crystal molecules on the second substrate 120-2 side, it is not affected by the refractive index distribution of the liquid crystal molecules and passes directly without diffusion.

[0084] Therefore, except in the case where no transverse electric field is generated (refer to...) Figure 3A In addition to the above, in the case of generating a transverse electric field (refer to...) Figure 3B The polarization composition of the second polarized light 520 transmitted through the first liquid crystal unit 110-1 also changes from the S polarization composition to the P polarization composition, but does not diffuse.

[0085] The liquid crystal molecules of the second liquid crystal layer 160-2 of the second liquid crystal cell 110-2 also have the same refractive index distribution as the liquid crystal molecules of the first liquid crystal layer 160-1 of the first liquid crystal cell 110-1. However, since the first polarized light 510 and the second polarized light 520 pass through the first liquid crystal cell 110-1, the polarization axis changes, and therefore the polarized light affected by the refractive index distribution of the liquid crystal molecules of the second liquid crystal layer 160-2 is opposite. That is, except in the case where no transverse electric field is generated (refer to...). Figure 3A In addition to the above, in the case of generating a transverse electric field (refer to...) Figure 3B The polarization composition of the first polarized light 510 transmitted through the second liquid crystal cell 110-2 also changes from S-polarized light composition to P-polarized light composition, but does not diffuse (see reference). Figure 3A as well as Figure 3B (6) to (8)). On the other hand, in the case where no transverse electric field is generated (see (6) to (8)). Figure 3A The polarization composition of the second polarized light 520 transmitted through the second liquid crystal cell 110-2 changes only from the P-polarized light composition to the S-polarized light composition, but when a transverse electric field is generated (refer to...). Figure 3B The polarization composition of the second polarized light 520 transmitted through the second liquid crystal unit 110-2 changes from P polarization to S polarization and diffuses in the first and second directions.

[0086] As can be seen from the above, in the optical element 100, by stacking two liquid crystal units 110 with the same structure, the polarization composition of the light incident on the optical element 100 undergoes two changes. As a result, the polarization composition before and after incident remains unchanged (refer to...). Figure 3A as well as Figure 3B (1) and (9) in the above). On the other hand, the optical element 100 can supply a potential to the transparent electrode 130, causing a change in the refractive index distribution of the liquid crystal molecules in the liquid crystal layer 160 of the liquid crystal unit 110, thereby refracting the light transmitted through the liquid crystal unit 110. More specifically, the first liquid crystal unit 110-1 can diffuse the light of the first polarized light 510 (P-polarized light component) in the first direction, the second direction, or the first direction and the second direction, and the second liquid crystal unit 110-2 can diffuse the light of the second polarized light 520 (S-polarized light component) in the first direction, the second direction, or the first direction and the second direction.

[0087] exist Figure 3A as well as Figure 3BOnly the first liquid crystal cell 110-1 and the second liquid crystal cell 110-2 are shown in the figure, and the light distribution of light transmitted through the first liquid crystal cell 110-1 and the second liquid crystal cell 110-2 is explained. The light distribution of light transmitted through the third liquid crystal cell 110-3 and the fourth liquid crystal cell 110-4 is also the same. Since the third liquid crystal cell 110-3 and the fourth liquid crystal cell 110-4 are arranged in a state rotated 90° relative to the first liquid crystal cell 110-1 and the second liquid crystal cell 110-2, the polarized light component that produces the effect is interchanged with that of the first liquid crystal cell 110-1 and the second liquid crystal cell 110-2. That is, the third liquid crystal cell 110-3 can diffuse the second polarized light 520 (S-polarized light component) in the first direction, the second direction, or both the first and second directions, and the fourth liquid crystal cell 110-4 can diffuse the first polarized light 510 (P-polarized light component) in the first direction, the second direction, or both the first and second directions.

[0088] As described above, in the optical element 100, by supplying a potential to the predetermined transparent electrode 130, the transmitted light can be diffused in a predetermined direction. On the other hand, in the illumination device 10, the light irradiated from the light-emitting module 200 is collimated light, and when no potential is supplied to the transparent electrode 130, there is a case where the light distribution pattern of the light transmitted through the optical element 100 is anisotropic. Even in such a case, correction can be performed using the optical element 100. Hereinafter, the correction of the light distribution pattern based on the optical element 100 will be explained.

[0089] [4. Correction of light distribution shape based on optical element 100]

[0090] Figure 4 This is a schematic diagram illustrating the relationship between the optical element 100 and the light-emitting module 200 of the lighting device 10 according to one embodiment of the present invention. It should be noted that... Figure 4 The diagram schematically shows the transparent electrode 130 of the liquid crystal unit 110 of the optical element 100, the light guide plate 250 of the light-emitting module 200, and the prism sheet 260.

[0091] In the optical element 100, the first transparent electrode 130-1, the second transparent electrode 130-2, the fifth transparent electrode 130-5, the sixth transparent electrode 130-6, the eleventh transparent electrode 130-11, the twelfth transparent electrode 130-12, the fifteenth transparent electrode 130-15, and the sixteenth transparent electrode 130-16 extend in the second direction. Additionally, the third transparent electrode 130-3, the fourth transparent electrode 130-4, the seventh transparent electrode 130-7, the eighth transparent electrode 130-8, the ninth transparent electrode 130-9, the tenth transparent electrode 130-10, the thirteenth transparent electrode 130-13, and the fourteenth transparent electrode 130-14 extend in the first direction. On the other hand, in the light-emitting module 200, the first groove 252 of the light guide plate 250 extends in the third direction. Furthermore, the second groove 254 of the light guide plate 250 and the groove 262 of the prism sheet 260 extend in the fourth direction. That is, the extension direction of the transparent electrode 130 intersects the extension direction of the first groove 252 or the second groove 254 of the light guide plate 250 or the groove 262 of the prism sheet 260 at 45° or 135°.

[0092] Figure 5 This is a schematic diagram illustrating the light distribution shape before and after correction in a lighting device 10 according to one embodiment of the present invention. Figure 5 The dashed lines represent the light distribution shape when no potential is supplied to the transparent electrode 130. In this embodiment, the light-emitting module 200 emits light from the center of its emission region. In the illumination device 10, the first groove 252 and the second groove 254 of the light guide plate 250 of the light-emitting module 200, and the groove 262 of the prism sheet 260 extend in a third or fourth direction. Therefore, the light distribution shape of the light irradiated from the light-emitting module 200 and transmitted through the optical element 100 sometimes differs in length in the third and fourth directions. For example, as shown... Figure 5 As shown by the dashed lines, it is sometimes depicted as a cross shape where the length of the fourth direction is smaller than the length of the third direction. In other words, Figure 5 The cross shape shown by the dashed line has indentations in both the first and second directions. In this case, by adjusting the potential supplied to the transparent electrode 130 extending in the first or second direction, light can be diffused in the first or second direction by the optical element 100, thus correcting the optical path. Figure 5 The light distribution shape is shown by the solid line in the diagram. For example, a potential can be supplied to the transparent electrode 130 such that the potential difference between adjacent transparent electrodes 130 on the substrate 120 is 2V. The potential value required for such correction can be stored in advance in the table 322. That is, in the illumination device 10, the control unit 300 reads the table 322 of the storage unit 320 and can easily correct the light distribution shape.

[0093] It should be noted that, in the above description, the lighting device 10 is illustrated as an example in which the extending direction of the transparent electrode 130 intersects the extending direction of the first groove 252 or the second groove 254 of the light guide plate 250, or the groove 262 of the prism sheet 260, at a 45° or 135° angle. However, the angle formed is not limited to this. The angle formed is only required to be within the range of approximately 45° or approximately 135°.

[0094] According to the above, the lighting device 10 according to one embodiment of the present invention can correct the light distribution shape of the light irradiated from the light-emitting module 200 by means of the optical element 100. That is, in the lighting device 10, since the extension direction of the transparent electrode 130 is different from the extension direction of the first groove 252 or the second groove 254 of the light guide plate 250 or the groove 262 of the prism sheet 260, the light distribution shape of the light transmitted through the optical element 100 before control can be corrected.

[0095] <Second Implementation>

[0096] Reference Figures 6-7C The lighting device 10A will be described below. It should be noted that, in the following description, when the structure of the lighting device 10A is the same as that of the lighting device 10, its description may be omitted.

[0097] Figure 6 This is a schematic diagram illustrating the relationship between the optical element 100A and the light-emitting module 200A of the lighting device 10A according to one embodiment of the present invention. It should be noted that... Figure 6 The diagram schematically shows the transparent electrode 130A of the liquid crystal cell 110A of the optical element 100A, the light guide plate 250A of the light-emitting module 200A, and the prism sheet 260A.

[0098] In optical element 100A, the first transparent electrode 130A-1, the second transparent electrode 130A-2, the fifth transparent electrode 130A-5, the sixth transparent electrode 130A-6, the eleventh transparent electrode 130A-11, the twelfth transparent electrode 130A-12, the fifteenth transparent electrode 130A-15, and the sixteenth transparent electrode 130A-16 extend in a fourth direction. Furthermore, the third transparent electrode 130A-3, the fourth transparent electrode 130A-4, the seventh transparent electrode 130A-7, the eighth transparent electrode 130A-8, the ninth transparent electrode 130A-9, the tenth transparent electrode 130A-10, the thirteenth transparent electrode 130A-13, and the fourteenth transparent electrode 130A-14 extend in a third direction. On the other hand, in light-emitting module 200A, the first groove 252A of light guide plate 250A extends in a first direction. Furthermore, the second groove 254A of the light guide plate 250A and the groove 262A of the prism sheet 260A extend in the second direction. That is, the extension direction of the transparent electrode 130A intersects the extension direction of the first groove 252A or the second groove 254A of the light guide plate 250A, or the groove 262A of the prism sheet 260A, at 45° or 135°.

[0099] Figures 7A to 7C This is a schematic diagram illustrating the light distribution shape before and after correction in a lighting device 10A according to one embodiment of the present invention. Figures 7A to 7C The dashed lines represent the light distribution shape when no potential is supplied to the transparent electrode 130A. In the illumination device 10A, the first slot 252A and the second slot 254A of the light guide plate 250A of the light-emitting module 200A, and the slot 262A of the prism sheet 260A extend in either a first or second direction. Therefore, the light distribution shape of the light irradiated from the light-emitting module 200A and transmitted through the optical element 100A sometimes differs in length in the first and second directions. For example, as... Figures 7A to 7C As shown by the dashed lines, it is sometimes depicted as a cross shape where the length of the second direction is smaller than the length of the first direction. In other words, Figures 7A to 7C The cross shape shown by the dashed line has indentations in the third and fourth directions. In this case, by adjusting the potential supplied to the transparent electrode 130A extending in the third or fourth direction, light can be diffused in the third or fourth direction by the optical element 100A, thereby correcting the situation. Figures 7A to 7C The solid lines in the table show the light distribution pattern. For example, the potential difference between adjacent transparent electrodes 130 is shown in Table 1, and a potential is supplied to each transparent electrode 130.

[0100] [Table 1]

[0101]

[0102] Figures 7A to 7CThe solid lines in the table show the light distribution patterns, which supply potential to each transparent electrode 130 in the manner of potential differences (1), (2), and (3) as shown in Table 1. From Table 1 and... Figures 7A to 7C It can be seen that by adjusting the potential supplied to the transparent electrode 130, the light distribution shape can be corrected not only to a circle but also to an ellipse. In addition, when the difference between the length in the first direction and the length in the second direction is large, the light distribution shape can be further corrected by increasing the potential difference between adjacent transparent electrodes 130.

[0103] According to the above, the lighting device 10A according to one embodiment of the present invention can correct the light distribution shape of the light irradiated from the light-emitting module 200A by means of the optical element 100A. That is, in the lighting device 10A, since the extension direction of the transparent electrode 130A is different from the extension direction of the first groove 252A or the second groove 254A of the light guide plate 250A, or the groove 262A of the prism sheet 260, the light distribution shape of the light transmitted through the optical element 100A before control can be corrected.

[0104] <Third Implementation Method>

[0105] Reference Figures 8-9C The lighting device 10B will be described below. It should be noted that, in the following description, when the structure of the lighting device 10B is the same as that of the lighting device 10, its description may be omitted.

[0106] Figure 8 This is a schematic exploded perspective view of a lighting device 10B according to one embodiment of the present invention. Figure 8 As shown, the lighting device 10B includes an optical element 100A and a light-emitting module 200B. The light-emitting module 200B includes an LED element 242 and a reflector 290B.

[0107] The reflector 290B is roughly conical trapezoidal in shape with an internal cavity. An LED element 242 is disposed within the reflector 290B. That is, the LED element 242 is positioned on the bottom surface of the reflector 290B and surrounded by its sides. Light emitted from the LED element 242 is reflected by the bottom or side surfaces of the reflector 290B and incident on the optical element 100. It should be noted that the shape of the reflector 290B is not limited to a roughly conical trapezoidal shape. The shape of the reflector 290B can be, for example, a polygonal prism, and the bottom or side surfaces of the reflector 290B can be either flat or curved.

[0108] Depending on the shape of the reflector 290B or the mounting deviation of the LED element 242, the light distribution pattern of the light irradiated from the light-emitting module 200B may sometimes become anisotropic. In this case, the light distribution pattern of the light emitted from the optical element 100A, which does not apply a potential to each transparent electrode 130A, also becomes anisotropic. For example, when the light distribution pattern of the light emitted from the optical element 100A is an ellipse with a length in the y-axis direction smaller than its length in the x-axis direction, the light distribution pattern can be corrected to isotropic by using the optical element 100A, which includes transparent electrodes 130A extending in both the x-axis and y-axis directions, to diffuse the light in the y-axis direction. Furthermore, by storing the value of the potential supplied to the transparent electrodes 130A in advance in the list 322, a potential capable of correcting the light distribution pattern can be supplied at all times.

[0109] It should be noted that when the major or minor axis direction of the light distribution shape before correction is inconsistent with the extension direction of the transparent electrode 130A of the optical element 100A, the configuration of the optical element 100A relative to the light-emitting module 200B can be adjusted so that the extension direction of the transparent electrode 130A is consistent with the major or minor axis direction before correction. Alternatively, the optical element 100 can be used instead of the optical element 100A.

[0110] In addition, the use of optical element 100A in the lighting device 10B not only enables correction of the light distribution shape, but also enables control of the light distribution shape.

[0111] Figures 9A to 9C It is a measurement result of the light distribution shape of the light emitted from the lighting device 10B according to one embodiment of the present invention. Specifically, Figures 9A to 9C The measurements are obtained by measuring the azimuth angle of the light irradiated from the lighting device 10B when the potential difference (4) to potential difference (6) shown in Table 2 is supplied to the manufactured lighting device 10B.

[0112] [Table 2]

[0113]

[0114] As shown in potential difference (4), if a potential is supplied to each transparent electrode 130 such that the potential difference between adjacent transparent electrodes 130 becomes 30V, a light distribution shape in which light diffuses along the x-axis and y-axis directions is obtained, as shown in FIG9. Furthermore, as shown in potential difference (5), if a potential is supplied to the transparent electrode 130 such that each liquid crystal cell 110 diffuses light along the y-axis direction, a light distribution shape in which light diffuses along the y-axis direction is obtained. Furthermore, as shown in potential difference (6), if a potential is supplied to the transparent electrode 130 such that each liquid crystal cell 110 diffuses light along the x-axis direction, a light distribution shape in which light diffuses along the x-axis direction is obtained.

[0115] As described above, the lighting device 10B according to one embodiment of the present invention can correct the light distribution shape of the light emitted from the light-emitting module 200B by means of optical element 100 or optical element 100A, thereby expanding the design freedom of the light-emitting module 200B, and in particular the reflector 290B, in the lighting device 10B. In other words, various light-emitting modules 200B can be used as the lighting device 10B.

[0116] It should be understood that various modifications and corrections can be conceived by those skilled in the art within the scope of this invention, and these modifications and corrections also fall within the scope of this invention. For example, any additions, deletions, or design changes made by those skilled in the art to the above embodiments, or any additions, omissions, or changes to processes or conditions, are also included within the scope of this invention as long as they possess the spirit of this invention.

[0117] Furthermore, regarding other effects brought about by the implementation method in this embodiment, the contents that are clearly defined according to the description in this specification, or the contents that can be appropriately conceived by those skilled in the art, can of course be understood as being brought about by the present invention.

[0118] Explanation of reference numerals in the attached figures

[0119] 10, 10A, 10B: Illumination device; 100, 100A: Optical element; 110, 110A: Liquid crystal unit; 120: Substrate; 130, 130A: Transparent electrode; 140: Alignment film; 150: Sealing material; 160: Liquid crystal layer; 170: Optical elastic resin layer; 200, 200A, 200B: Light-emitting module; 210: Metal frame; 220: Reflector; 230: Resin frame; 240: Light source substrate; 242 : LED component; 250, 250A: Light guide plate; 252, 252A: First slot; 254, 254A: Second slot; 260, 260A: Prism sheet; 262, 262A: Slot; 270: Gasket; 280: Light-shielding double-sided tape; 290B: Reflector; 300: Control unit; 310: Signal processing unit; 320: Storage unit; 322: List; 510: First polarized light; 520: Second polarized light; 900: Information terminal.

Claims

1. A lighting device, comprising: Light-emitting module; as well as An optical element, comprising a first liquid crystal unit and a second liquid crystal unit stacked together, allows light incident from the light-emitting module to pass through. The first liquid crystal unit and the second liquid crystal unit each include: A first substrate, wherein a first transparent electrode and a second transparent electrode are alternately disposed in a first direction; and The second substrate has a third transparent electrode and a fourth transparent electrode alternately arranged in a second direction intersecting the first direction. The light-emitting module includes: light source; A light guide plate includes an incident end face for light irradiated from the light source and an exit end face for emitting the incident light; and The prism sheet is positioned opposite the first face. The second substrate of the first liquid crystal cell is adjacent to the first substrate of the second liquid crystal cell. The first surface includes a plurality of first grooves extending upward on a third party intersecting the first direction and the second direction.

2. The lighting device according to claim 1, wherein, The light-emitting module illuminates collimated light.

3. The lighting device according to claim 1 or 2, wherein, The second side of the light guide plate, opposite to the first side, includes a plurality of second grooves extending in a fourth direction intersecting the third direction.

4. The lighting device according to claim 3, wherein, The optical element also has a third liquid crystal unit and a fourth liquid crystal unit stacked on top of it. The third liquid crystal unit and the fourth liquid crystal unit respectively include: A third substrate, wherein a fifth transparent electrode and a sixth transparent electrode are alternately arranged in a comb-like pattern in the second direction; and The fourth substrate has a seventh transparent electrode and an eighth transparent electrode alternately arranged in a comb-like pattern in the first direction. The second substrate of the second liquid crystal unit is adjacent to the third substrate of the third liquid crystal unit. The fourth substrate of the third liquid crystal unit is adjacent to the third substrate of the fourth liquid crystal unit.

5. The lighting device according to claim 4, wherein, The first direction intersects the second direction at a 90°±10° angle. The third direction intersects the fourth direction at 90°±10°.

6. The lighting device according to claim 5, wherein, The angle between the first direction and the third direction is 45°±10°.

7. The lighting device according to claim 6, wherein, The lighting device also includes a list storing potential values ​​for correcting the light distribution shape when the potential difference between the first transparent electrode and the second transparent electrode, the potential difference between the third transparent electrode and the fourth transparent electrode, the potential difference between the fifth transparent electrode and the sixth transparent electrode, and the potential difference between the seventh transparent electrode and the eighth transparent electrode are all 0V.

8. A lighting device, comprising: Light-emitting module; as well as An optical element, comprising a first liquid crystal unit and a second liquid crystal unit stacked together, allows light incident from the light-emitting module to pass through. The first liquid crystal unit and the second liquid crystal unit each include: A first substrate, wherein a first transparent electrode and a second transparent electrode are alternately disposed in a first direction; and The second substrate has a third transparent electrode and a fourth transparent electrode alternately arranged in a second direction intersecting the first direction. The light-emitting module includes: Light source; and A reflector is disposed around the light source and reflects light irradiated from the light source, wherein the second substrate of the first liquid crystal cell is adjacent to the first substrate of the second liquid crystal cell.

9. The lighting device according to claim 8, wherein, The optical element also has a third liquid crystal unit and a fourth liquid crystal unit stacked on top of it. The third liquid crystal unit and the fourth liquid crystal unit respectively include: A third substrate, wherein a fifth transparent electrode and a sixth transparent electrode are alternately arranged in a comb-like pattern in the second direction; and The fourth substrate has a seventh transparent electrode and an eighth transparent electrode alternately arranged in a comb-like pattern in the first direction. The second substrate of the second liquid crystal unit is adjacent to the third substrate of the third liquid crystal unit. The fourth substrate of the third liquid crystal unit is adjacent to the third substrate of the fourth liquid crystal unit.

10. The lighting device according to claim 9, wherein, The first direction intersects the second direction at 90°±10°.

11. The lighting device according to claim 10, wherein, The lighting device also includes a list storing potential values ​​for correcting the light distribution shape when the potential difference between the first transparent electrode and the second transparent electrode, the potential difference between the third transparent electrode and the fourth transparent electrode, the potential difference between the fifth transparent electrode and the sixth transparent electrode, and the potential difference between the seventh transparent electrode and the eighth transparent electrode are all 0V.

12. The lighting device according to any one of claims 1 to 11, wherein, The lighting device also includes a control unit that is communicatively connected to an information terminal. The signal processing unit of the control unit controls the brightness of the light-emitting module based on the request signal from the information terminal.

13. The lighting device according to any one of claims 1 to 11, wherein The lighting device also includes a control unit that is communicatively connected to an information terminal. The signal processing unit of the control unit controls the potential supplied to the optical element based on the request signal from the information terminal.

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