LIGHTING DEVICE

Abstract

Illumination device (ILD) comprising: several light guide plates (LG1u, LG1d, LG2u, LG2d) and several laser light source elements (LS11, LS12, LS21, LS22), wherein the several light guide plates (LG1u, LG1d, LG2u, LG2d) comprise several pairs of light guide plates (LG1, LG2), wherein the several pairs of light guide plates (LG1, LG2) each comprise a first light guide plate (LG1d, LG2d) and a second light guide plate (LG1u, LG2u) provided mounted above the first light guide plate (LG1d, LG2d), wherein the long sides (L1us4, L1ds4, L2us3, L2ds3) of the several pairs of light guide plates (LG1, LG2) are coupled to each other facing each other, wherein the several laser light source elements (LS11, LS12, LS21, LS22) comprise several first Light source elements (LS12,LS22) which are arranged facing a first side surface of a short side (L1ds2,L2ds2) of the first light guide plate (LG1d,LG2d) of the light guide plate pair (LG1,LG2), and include several second light source elements (LS11,LS21),which are arranged facing a second side surface (L1us1,L2us1) of the second light guide plate (LG1u,LG2u) of the light guide plate pair (LG1,LG2) opposite the first side surface (L1ds2,L2ds2) and wherein the multiple light guide plate pairs (LG1,LG2) include a first light guide plate pair (LG1) and a second light guide plate pair (LG2) that are adjacent to each other, wherein a coupling surface (L1ds4,L2ds3) of the first light guide plate (LG1d) of the first light guide plate pair (LG1) and the first light guide plate (LG2d) of the second light guide plate pair (LG2) and a coupling surface (L1us4,L2us3) of the second light guide plate (LG1u) of the first light guide plate pair (LG1) and the second light guide plate (LG2u) of the second light guide plate pair (LG2) are separated from each other.

Description

The present application claims priority over Japanese patent application No. 2021-113652, filed on July 8, 2021, the full contents of which are hereby incorporated into the present subject matter. Area One embodiment of the present invention relates to a lighting device. background Display devices, such as liquid crystal displays, comprise a display field with pixels and a lighting device, such as a backlight, that illuminates the display field. The lighting device includes a light source that emits light and a light guide plate onto which the light from the light source is directed. A lighting device with a laser light source has been developed as the light source. Patent literature US 2006 / 0022935A1 discloses a surface light source device comprising a light source control device for controlling light sources based on light emission blocks, wherein a light output area is divided into two or more light emission blocks, a light quantity detection device for detecting light quantities based on output light beams emitted from the two or more light emission blocks, and a control device for adjusting emission light quantities of the light sources according to the respective light emission blocks based on light quantities detected during illumination periods in which only one of the light emission blocks is illuminated, which is subject to light quantity detection by the light quantity detection device. Patent DE 10 2005 059 958 A1 discloses a lighting device, particularly for motor vehicles, comprising a light source and a light guide that emits light introduced into it by the light source via a light output surface, wherein light output elements are provided on the side opposite the light output surface. Patent US 2009 / 0 073 721 A1 discloses a display device comprising a light guide plate and a light source located on an edge surface of the light guide plate. The light guide plate incorporates a display area consisting of a point-like reflective area with a reflective surface for reflecting a light beam emitted by the light source onto a surface. Brief description of the characters Figure 1 shows a perspective view schematically illustrating the configuration of a display device according to one embodiment; Figure 2 shows a top view schematically illustrating the configuration of a lighting device; Figure 3 shows a sectional view of the display device along line A1-A2 from Figure 1; Figure 4 shows a perspective view of an example of a coupling section of the light guide plate; Figure 5A shows a sectional view of another example of the coupling section of the light guide plate; Figure 5B shows a sectional view of another example of the coupling section of the light guide plate; Figure 6 shows a sectional view of another example of the coupling section of the light guide plate. Detailed description The claimed subject matter is defined by the accompanying claims. In the following, parts of the description and the drawings relating to earlier embodiments, which do not necessarily include all features for implementing embodiments of the claimed subject matter, are to be understood as not representing embodiments of the claimed subject matter, but rather as examples useful for understanding the embodiments of the claimed subject matter.A lighting device according to one embodiment comprises several light guide plates and several laser light source elements, wherein the several light guide plates comprise several pairs of light guide plates, wherein the several pairs of light guide plates each comprise a first light guide plate and a second light guide plate provided mounted above the first light guide plate, wherein the long sides of the several pairs of light guide plates are coupled to each other facing each other, wherein the several laser light source elements comprise several first light source elements that are arranged facing a first side surface of a short side of the first light guide plate of the pair of light guide plates, and several second light source elements that are arranged facing a second side surface of the second light guide plate of the pair of light guide plates opposite the first side surface. The present embodiment is based on the objective of providing a large lighting device. The following describes embodiments of the present invention with reference to the figures. The disclosure is merely exemplary, and modifications made by a person skilled in the art, which are readily apparent and do not compromise the essence of the invention, are of course also included within the scope of the invention. The figures serve to clarify the description, and their individual components schematically represent width, thickness, shape, and the like in comparison to an actual embodiment. Therefore, they are merely exemplary and are not intended to limit the interpretation of the present invention. In this description and the figures, elements that are identical to those already mentioned with reference to another figure are designated with the same reference numerals, and a further detailed description of these elements is unnecessary. The following is a detailed description of a lighting device and a display device according to one embodiment, with reference to the figures. In the present embodiment, a first direction X, a second direction Y, and a third direction Z are orthogonal to each other, but may also intersect at an angle other than 90 degrees. A direction in the direction of the leading end of the arrow in the third direction Z is defined as above, and a direction opposite to the direction of the leading end of the arrow in the third direction Z is defined as below. Furthermore, when the text refers to a "second element above a first element" and a "second element below a first element," the second element can be in contact with the first element or separated from it. In the latter case, a third element can be positioned between the first and second elements. However, when it says "a second element above a first element" or "a second element below a first element," the second element is in contact with the first element. If a viewing position exists where the lighting device is viewed from the side of the leading end of the arrow in the third direction Z, then a view from this viewing position onto an XY plane defined by the first direction X and the second direction Y is called a top view. A view of the lighting device onto an XZ plane defined by the first direction X and the third direction Z, or a YZ plane defined by the second direction Y and the third direction Z, is called a sectional view. embodiment Fig. 1 shows a perspective view schematically illustrating the configuration of a display device according to one embodiment. A DSP display device comprises a display field PNL, an illumination device ILD (which is a backlight), an IC driver chip ICP (which drives the display field PNL), and a flexible printed circuit board FPC1 (which transmits a control signal to the display field PNL). For example, the flexible printed circuit board FPC1 is connected to a control module that controls the operation of the display field PNL. The display field PNL comprises a carrier SUB1 (array carrier) and a carrier SUB2 (counter-support) facing carrier SUB1. The display field PNL has a display area DA that displays images. Within display area DA, the display field PNL contains pixels PX arranged in a matrix. Although not shown, carriers SUB1 and SUB2 of the display field PNL are bonded together by a sealing element. A liquid crystal layer is enclosed between carriers SUB1 and SUB2 in an area surrounded by the sealing element. The lighting device ILD comprises several light source elements and a light guide plate LG facing the support SUB1. The light guide plate LG has several light guide plates and functions as a single light guide plate overall. In the present embodiment, the light guide plate LG has three pairs of light guide plates, with an upper and a lower pair, i.e., two light guide plates arranged as a pair. Specifically, the light guide plate LG comprises six light guide plates LG1u, LG1d, LG2u, LG2d, LG3u, and LG3d. However, the number of light guide plates is not limited to this, and there can also be two, four, or more pairs. Details of the light source element are described later. The LG1u light guide plate is positioned above the LG1d light guide plate. In other words, the LG1u light guide plate is positioned between the LG1d light guide plate and the PNL display panel. The LG2u light guide plate is positioned above the LG2d light guide plate. In other words, the LG2u light guide plate is positioned between the LG2d light guide plate and the PNL display panel. The LG3u light guide plate is positioned above the LG3d light guide plate. In other words, the LG3u light guide plate is positioned between the LG3d light guide plate and the PNL display panel. The light guide plates LG1u and LG1d, LG2u and LG2d as well as LG3u and LG3d are each stacked on top of each other in a top view. In Fig. 1, the light guide plates LG1u and LG1d, LG2u and LG2d, and LG3u and LG3d are each referred to as light guide plates LG1, LG2, and LG3, respectively. The light guide plates LG1, LG2, and LG3 are also pairs of light guide plates, as discussed above. Fig. 2 is a top view that schematically illustrates the configuration of the lighting device. The light guide plates LG1, LG2, and LG3 are arranged such that their long sides face each other. The short sides of the light guide plates LG1, LG2, and LG3 together form the long side of the light guide plate LG. As shown in Fig. 2, the supports SUB1 and SUB2 and the light guide plate LG have long sides extending in the first direction X and short sides extending in the second direction Y and are rectangular in plan view. The light guide plates LG1, LG2, and LG3 each have short sides extending in the first direction X and long sides extending in the second direction Y. Several light source elements are provided on one side surface on the short side. The light guide plate LG1u comprises side surfaces L1us1 and L1us2, which extend in the first direction X and face each other. The light guide plate LG1d comprises side surfaces L1ds1 and L1ds2, which extend in the first direction X and face each other. The light source element LS11 faces side surface L1us1 of the light guide plate LG1u, and the light source element LS12 faces side surface L1ds2 of the light guide plate LG1d. The light guide plate LG2u comprises side surfaces L2us1 and L2us2, which extend in the first direction X and face each other. The light guide plate LG2d comprises side surfaces L2ds1 and L2ds2, which extend in the first direction X and face each other. The light source element LS21 faces side surface L2us1 of the light guide plate LG2u, and the light source element LS22 faces side surface L2ds2 of the light guide plate LG2d. The light guide plate LG3u comprises side surfaces L3us1 and L3us2, which extend in the first direction X and face each other. The light guide plate LG3d comprises side surfaces L3ds1 and L3ds2, which extend in the first direction X and face each other. The light source element LS31 faces side surface L3us1 of the light guide plate LG3u, and the light source element LS32 faces side surface L3ds2 of the light guide plate LG3d. The side surfaces L1us1, L1ds2, L2us1, L2ds2, L3us1, and L3ds2 are each a side surface on the short side of the light guide plate LG1u, LG1d, LG2u, LG2d, LG3u, and LG3d, respectively. This means that the light source elements are each arranged facing a side surface on the short side of the light guide plate. The side surface L1us4 of the light guide plate LG1u and the side surface L1ds4 of the light guide plate LG1d are in contact with the side surface L2us3 of the light guide plate LG2u and the side surface L2ds3 of the light guide plate LG2d. The side surface L2us4 of the light guide plate LG2u and the side surface L2ds4 of the light guide plate LG2d are in contact with the side surface L3us3 of the light guide plate LG3u and the side surface L3ds3 of the light guide plate LG3d. These side surfaces are mirror surfaces, and side surfaces provided in contact with each other are coupled together in a close arrangement of the surfaces. In the present embodiment, the closely adjoining side surfaces described above are also referred to as coupling surfaces. Side surfaces L1us4 and L2us3 are the coupling surfaces of the light guide plates LG1u and LG2u. Side surfaces L1ds4 and L2ds3 are the coupling surfaces of the light guide plates LG1d and LG2d. Side surfaces L1us4, L2us3, L1ds4, and L2ds3 can also be referred to as the coupling surfaces of the light guide plates LG1 and LG2. The same applies to the coupling surfaces of the light guide plates LG2 and LG3. The side surfaces L1us4, L1ds4, L2us3, L2ds3, L2us4, L2ds4, L3us3, and L3ds3 are each a side surface on the long side of the light guide plate LG1u, LG1d, LG2u, LG2d, LG2u, LG2d, LG2d, LG3u, and LG3d, respectively. The light guide plates are thus coupled to each other at their side surfaces on the long side. A light source is arranged on the side surface L1us3, the side surface L1ds3, the side surface L3us4 and the side surface L3ds4 on the short side of the light guide plate LG. For a large lighting device, for example a 30-inch backlight, a large molding machine with a mold clamping force of at least 800 tons is required in an injection molding process of the light guide plate. In contrast, the mold clamping force required for a light guide plate of, for example, 17 inches, may be low during the injection molding process. However, a molding machine with low clamping force cannot produce a large light guide plate. Therefore, manufacturing a large lighting and display device is difficult. In the present embodiment, a large light guide plate can be obtained for a backlight measuring 18 inches or more by arranging several light guide plates in series without the use of a large forming machine. In this way, a large lighting device can be obtained. A large display device incorporating this large lighting device can also be obtained. Fig. 3 is a sectional view of the display device at line A1-A2 from Fig. 1. In Fig. 3 only the light guide plate LG1(LG1u and LG1d) is shown, but it also applies to the light guide plates LG2(LG2u and LG2d as well as LG3u and LG3d). The illumination device ILD of the display device DSP comprises a reflective film RFS, the light guide plate LG1d, the light guide plate LG1u and a prismatic film PRS. These are arranged in this order in the third direction Z. The light guide plate LG1d has side surfaces L1ds1 and L1ds2, as well as main surfaces L1da and L1db. As mentioned above, the light source element LS12 is positioned facing side surface L1ds2 and is not positioned facing side surface L1ds1. Main surface L1da faces the main surface L1ub of the light guide plate LG1u. Main surface L1db faces the reflective sheet RFS. The light guide plate LG1u has side surfaces L1us1 and L1us2, as well as main surfaces L1ua and L1ub. The main surface L1ub is located on the side opposite the main surface L1da. As mentioned above, the light source element LS11 faces side surface L1us1 and is not located on side surface L1us2. The main surface L1ua faces the main surface PRb of the prism film PRS. The main surface L1ub faces the main surface L1da of the light guide plate LG1d. Within the area of ​​the light guide plate LG1d, a region located away from side surface L1ds2 and close to side surface L1ds1, i.e., away from light source element LS12, is designated AR1d1. Region AR1d1 includes a central section L1dc of the light guide plate LG1d. Within the area of ​​the light guide plate LG1d, a region that is not AR1d1, i.e., close to light source element LS12, is designated AR1d2. Region AR1d2 does not include the central section L1dc of the light guide plate LG1d. Several projection sections TV1db are provided on the main surface L1db of the area AR1d1. These projection sections extend in one direction parallel to the first direction X and are arranged in one direction parallel to the second direction Y. Each of the multiple projection sections TV1db has a triangular shape, and the cross-sectional angle of their vertex at the YZ plane is 130 degrees. Light LT12 emitted by the light source element LS12 is reflected by the projection with the vertex angle of 130 degrees at a reflection angle of 15 degrees and directed to the front surface. No TV1db section is provided in the AR1d2 area. Within the area of ​​the light guide plate LG1u, a region located away from side surface L1us1 and close to side surface L1us2, i.e., away from the light source element LS11, is designated AR1u2. Region AR1u2 includes a central section L1uc of the light guide plate LG1u. Within the area of ​​the light guide plate LG1u, a region that is not AR1u2, i.e., close to the light source element LS11, is designated AR1u1. Region AR1u1 does not include the central section L1uc of the light guide plate LG1u. In area AR1u2, several projection sections TV1ub are provided, extending in one direction parallel to the first direction X and arranged in another direction parallel to the second direction Y. Each of the multiple projection sections TV1ub has a triangular shape, and the cross-sectional angle of its vertex at the YZ plane is 130 degrees. Light LT11 emitted by the light source element LS11 is reflected by the projection with the vertex angle of 130 degrees at a reflection angle of 15 degrees and directed to the front surface. No TV1ub lead section is provided in the AR1u1 area. The prism film PRS has principal surfaces PRa and PRb. Principal surface PRa faces the display field PNL. Principal surface PRb faces the principal surface L1ua of the light guide plate LG1u. Although not illustrated, several protruding sections are provided on the prism film PRS. The light source elements LS11 and LS12 can use a laser light source element, such as a semiconductor laser or similar device, that emits polarized laser light. Laser light does not spread out but is linear. The light source elements LS11, LS12, LS21, LS22, LS31, and LS32 can each comprise multiple luminaires that produce light of different colors. For example, if a light source element comprises three luminaires that each produce green, red, and blue light, light in mixed colors of these colors (e.g., white) can be obtained. Light LT12 (solid line) emitted from the light source element LS12 enters the side surface L1ds2 and propagates in one direction opposite to the second direction Y inside the light guide plate LG1d by reflection. When the light LT12 reaches the area AR1d1, the angle of reflection changes due to the protruding sections TV1db, causing it to be emitted towards the light guide plate LG1u. Light LT12 entering the light guide plate LG1u passes through the area AR1u1, in which no projection sections TV1ub are provided, and is emitted in the direction of the prism foil PRS. Light LT12 incident on the prism foil PRS changes its reflection angle again due to the projecting sections of the prism foil PRS and is emitted in a direction parallel to the third direction Z, i.e., in a direction perpendicular to the main surface PRa of the prism foil PRS. The emitted light LT12 falls into the display field PNL. Light LT11 (dotted line) emitted from the light source element LS11 enters through the side surface L1us1 and propagates in the second direction Y inside the light guide plate LG1u under reflection. When the light LT11 reaches the area AR1u2, the angle of reflection changes due to the protruding sections TV1ub, causing it to be emitted towards the prism foil PRS. Light LT11 incident on the prism foil PRS changes its reflection angle again due to the projecting sections of the prism foil PRS and is emitted in a direction parallel to the third direction Z, i.e., in a direction perpendicular to the main surface PRa of the prism foil PRS. The emitted light LT11 falls into the display field PNL. The LT11 and LT12 lights are linearly polarized. Therefore, a single polarizing plate is sufficient for the PNL display, which is a liquid crystal display. Compared to using two polarizing plates, this increases the brightness of the PNL display. Areas AR1u2 and AR1d1 are superimposed. In this superimposed area, the central section L1uc of the light guide plate LG1u and the central section L1dc of the light guide plate LG1d overlap in a top view. Areas AR1u1 and AR1d2 are not superimposed. Returning to Fig. 2, a connecting part between light guide plates will now be described. As described above, the light source element of the present embodiment emits laser light. Compared to a light source element such as a light-emitting diode (LED), the linearity of a laser light source is increased. Therefore, at coupling sections of adjacent light guide plates, for example, the coupling section of light guide plates LG1 and LG2, and more precisely at the side surfaces L1us4 and L2us3 as well as the side surfaces L1ds4 and L2ds3, the reflection from the respective side surfaces is low, resulting in the advantage that the coupling sections are not noticeable. Fig. 4 is a perspective view of an example of a coupling section of the light guide plate. The side surfaces L1us4 and L2us3, as well as the side surfaces L1ds4 and L2ds3, are closely adjacent to each other and each form the coupling surface of the light guide plates LG1u and LG2u and the coupling surface of the light guide plates LG1d and LG2d, respectively. As described above, the coupling surfaces are reflective surfaces. The side surfaces L1us4 and L2us3, as well as the side surfaces L1ds4 and L2ds3, overlap in a top view. These side surfaces also form the coupling surfaces of the light guide plates LG1 and LG2, which constitute a light guide plate pair. According to the present embodiment, the reflection from the side surface of the light guide plate is low, the coupling sections are inconspicuous, and it is possible to obtain a large illumination device. Furthermore, a large display device incorporating this illumination device can be provided. Figures 5A and 5B are sectional views of another example of the coupling section of the light guide plate. The example shown in Figures 5A and 5B differs from the example shown in Figure 4 in that the coupling sections are not in close contact with each other. Fig. 5A is a sectional view of a region of the coupling section of the light guide plates LG1 and LG2. The light guide plate LG1u has end sections E1ua and E1ub on its main surfaces L1ua and L1ub, respectively. The light guide plate LG2u has end sections E2ua and E2ub on its main surfaces L2ua and L2ub, respectively. The terminal sections E1ua and E2ua are adjacent. In contrast, the terminal sections E1ub and E2ub are arranged close to each other, facing each other, but are not in contact. The terminal segments E1ua and E2ua are located close to each other but are not in contact. The distance between terminal segments E1ua and E2ua is greater than that between terminal segments E1ub and E2ub. A cross-sectional shape on the XZ plane in the area of ​​the coupling section of the light guide plates LG1u and LG2u is wedge-shaped. The side surface L1us4 of the light guide plate LG1u and the side surface L2us3 of the light guide plate LG2u are not in close proximity. Like the LG1u and LG2u light guide plates, the LG1d light guide plate also has end sections E1da and E1db on its main surfaces L1da and L1db, respectively. Similarly, the LG2d light guide plate has end sections E2da and E2db on its main surfaces L2da and L2db, respectively. The end sections E1da and E2da are adjacent. In contrast, the end sections E1db and E2db are arranged close to each other, facing each other, but are not in contact. The end sections E1da and E2da are located close to each other but are not in contact. The distance between the end sections E1da and E2da is greater than the distance between the end sections E1db and E2db. A cross-sectional shape on the XZ plane in the area of ​​the coupling section of the light guide plates LG1d and LG2d is wedge-shaped. The side surface L1ds4 of the light guide plate LG1d and the side surface L2ds3 of the light guide plate LG2d are not in close proximity. As shown in Fig. 5A, the configuration of the arrangement of the light guide plates LG1 and LG2 has the advantage compared to Fig. 4 that the coupling sections are even less noticeable. Fig. 5B is a sectional view of a region of the coupling section of the light guide plates LG1 and LG2. The example shown in Fig. 5B differs from the example shown in Fig. 5A in that the sectional shape of the coupling section of the light guide plate pair is wedge-shaped. In Fig. 5B, the distance between the end sections E1ua and E2ua, the end sections E1ub and E2ub, the end sections E1da and E2da, and the end sections E1db and E2db increases in this order. The light guide plate LG1, which contains the light guide plates LG1u and LG1d, and the light guide plate LG2, which contains the light guide plates LG2u and LG2d, are each a light guide plate pair, as mentioned above. A cross-sectional shape at the XZ plane of the coupling section of the light guide plates LG1 and LG2 is wedge-shaped. A lighting device can also be obtained according to Fig. 5B, the coupling sections of which are not noticeable. Fig. 6 shows a sectional view of another example of the coupling section of the light guide plate. The example shown in Fig. 6 differs from the example shown in Fig. 4 in that the coupling surfaces on the upper and lower light guide plates are separated from each other. In the example from Fig. 6, the side surfaces L1us4 and L2us3, as well as L1ds4 and L2ds3, do not overlap with respect to the third direction Z. The end sections E1ub and E2ub, as well as the end sections E1da and E2da, lie in the same XY plane and are separated from each other. As shown in Fig. 6, the coupling surfaces are even less noticeable when the coupling surface of the light guide plates LG1u and LG2u on the upper side and the coupling surface of the light guide plates LG1d and LG2d on the lower side are separated from each other. This allows for a lighting device whose coupling sections are even less conspicuous. In the present disclosure, in a pair of light guide plates comprising a pair of light guide plates, the lower light guide plate is referred to as the first light guide plate and the upper light guide plate is also referred to as the second light guide plate. The long sides and the short sides of the light guide plates in a pair of light guide plates are also referred to as the long sides and short sides of the light guide plate pair. The central section L1dc of the light guide plate LG1d is considered the first central section, and the central section L1uc of the light guide plate LG1u is considered the second central section. The regions AR1d1, AR1d2, AR1u1, and AR1u1 are also referred to as the first region, second region, third region, and fourth region, respectively. The lead section TV1db and the lead section TV1ub are also referred to as the first lead section and second lead section, respectively. The principal surfaces L1ua and L2ua shown in Fig. 5A and Fig. 5B are designated as the first principal surfaces. The principal surfaces L1ub and L2ub are designated as the second principal surfaces. The principal surfaces L1da and L2da are designated as the third principal surfaces. The principal surfaces L1db and L2db are designated as the fourth principal surfaces. The end segments E1ua and E2ua are referred to as the first end segments, and E1ub and E2ub as the second end segments. E1da and E2da are referred to as the third end segments, and E1db and E2db as the fourth end segments. Several embodiments of the present invention have been described, but these embodiments are purely illustrative and are not intended to limit the scope of the invention. These novel embodiments can be carried out in other ways, and various omissions, substitutions, and modifications can be made to them without departing from the scope of the invention. These embodiments and their variations are part of the scope and teachings of the invention and are also included in the scope of the inventions set forth in the claims and their equivalents.

Claims

Illumination device (ILD) comprising: several light guide plates (LG1u, LG1d, LG2u, LG2d) and several laser light source elements (LS11, LS12, LS21, LS22), wherein the several light guide plates (LG1u, LG1d, LG2u, LG2d) comprise several pairs of light guide plates (LG1, LG2), wherein the several pairs of light guide plates (LG1, LG2) each comprise a first light guide plate (LG1d, LG2d) and a second light guide plate (LG1u, LG2u) provided mounted above the first light guide plate (LG1d, LG2d), wherein the long sides (L1us4, L1ds4, L2us3, L2ds3) of the several pairs of light guide plates (LG1, LG2) are coupled to each other facing each other, wherein the several laser light source elements (LS11, LS12, LS21, LS22) comprise several first Light source elements (LS12,LS22) which are arranged facing a first side surface of a short side (L1ds2,L2ds2) of the first light guide plate (LG1d,LG2d) of the light guide plate pair (LG1,LG2), and include several second light source elements (LS11,LS21),which are arranged facing a second side surface (L1us1,L2us1) of the second light guide plate (LG1u,LG2u) of the light guide plate pair (LG1,LG2) opposite the first side surface (L1ds2,L2ds2) and wherein the multiple light guide plate pairs (LG1,LG2) include a first light guide plate pair (LG1) and a second light guide plate pair (LG2) that are adjacent to each other, wherein a coupling surface (L1ds4,L2ds3) of the first light guide plate (LG1d) of the first light guide plate pair (LG1) and the first light guide plate (LG2d) of the second light guide plate pair (LG2) and a coupling surface (L1us4,L2us3) of the second light guide plate (LG1u) of the first light guide plate pair (LG1) and the second light guide plate (LG2u) of the second light guide plate pair (LG2) are separated from each other. Lighting device (ILD) according to claim 1, wherein the first light guide plate (LG1d) further comprises a first region (AR1d1) including a first central section (L1dc) and a second region (AR1d2) not including the first central section (L1dc), and the second light guide plate (LG1u) comprises a third region (AR1u1) not including a second central section (L1uc), a fourth region (AR1u2) including the second central section (L1uc), several first projection sections (TV1db) provided in the first region (AR1d1), and several second projection sections (TV1ub) provided in the fourth region (AR1u2), wherein the first region (AR1d1) is located further away from the first light source element (LS12) than the second region (AR1d2), and the fourth region (AR1u2) is located further away from the second light source element (LS11) than the third region (AR1u1). is. Lighting device (ILD) according to claim 2, wherein the second area (AR1d2) and the third area (AR1u1) do not overlap in plan view. Lighting device (ILD) according to claim 2, wherein the multiple first projection sections (TV1db) and the multiple second projection sections (TV1ub) each have the shape of an isosceles triangle in their cut form. Lighting device (ILD) according to claim 4, wherein the multiple first projection sections (TV1db) and the multiple second projection sections (TV1ub) each have the shape of an equilateral triangle in their cut shape. Illumination device (ILD) comprising: several light guide plates (LG1u, LG1d, LG2u, LG2d) and several laser light source elements (LS11, LS12, LS21, LS22), wherein the several light guide plates (LG1u, LG1d, LG2u, LG2d) comprise several pairs of light guide plates (LG1, LG2), wherein the several pairs of light guide plates (LG1, LG2) each comprise a first light guide plate (LG1d, LG2d) and a second light guide plate (LG1u, LG2u) provided mounted above the first light guide plate (LG1d, LG2d), wherein the long sides (L1us4, L1ds4, L2us3, L2ds3) of the several pairs of light guide plates (LG1, LG2) are coupled to each other facing each other, wherein the several laser light source elements (LS11, LS12, LS21, LS22) comprise several first Light source elements (LS12,LS22) which are arranged facing a first side surface of a short side (L1ds2,L2ds2) of the first light guide plate (LG1d,LG2d) of the light guide plate pair (LG1,LG2), and include several second light source elements (LS11,LS21),which are arranged facing a second side surface (L1us1,L2us1) of the second light guide plate (LG1u,LG2u) of the light guide plate pair (LG1,LG2) opposite the first side surface (L1ds2,L2ds2) and wherein the multiple light guide plate pairs (LG1,LG2) include a first light guide plate pair (LG1) and a second light guide plate pair (LG2) that are adjacent to each other, wherein the second light guide plate (LG1u) of the first light guide plate pair (LG1) and the second light guide plate (LG2u) of the second light guide plate pair (LG2) each have a first main surface (L1ua,L2ua) and a second main surface (L1ub,L2ub) on a side opposite the first main surface (L1ua,L2ua),wherein a first end section (E1ua) of the first main surface (L1ua) of the second light guide plate (LG1u) of the first light guide plate pair (LG1) and a first end section (E2ua) of the first main surface (L2ua) of the second light guide plate (LG2u) of the second light guide plate pair (LG2) are in contact and a second end section (E1ub) of the second main surface (L1ub) of the second light guide plate (LG1u) of the first light guide plate pair (LG1) and a second end section (E2ub) of the second main surface (L1ub) of the second light guide plate (LG2u) of the second light guide plate pair (LG2) are separated from each other. Lighting device (ILD) according to claim 6, wherein the first light guide plate (LG1d) of the first light guide plate pair (LG1) and the first light guide plate (LG2d) of the second light guide plate pair (LG2) each have a third main surface (L1a, L2da) and a fourth main surface (L1db, L2db) on the opposite side of the third main surface (L1da, L2da), wherein a third end section (E1da) of the third main surface (L1da) of the first light guide plate (LG1d) of the first light guide plate pair (LG1) and a third end section (E2da) of the third main surface (L2da) of the first light guide plate (LG2d) of the second light guide plate pair (LG2) are in contact, and a fourth end section (E1db) of the fourth main surface (L1db) of the first light guide plate (LG1d) of the first light guide plate pair (LG1) and a fourth end section (E2db) of the fourth main surface (L2db) of the first light guide plate (LG2d) of the second light guide plate pair (LG2) are apart.

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