JP2006003638A - Light guide plate and light source device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light guide plate that can reduce time, cost, labor, etc., in the manufacturing process and that is intended to efficiently emit light outgoing from a light source on a liquid crystal display surface, and also to provide a light source device. <P>SOLUTION: In the light guide plate 10, a light guide surface 10B is arranged along the display face of a display panel 30, display light L1 emitted from an external light source 21 is guided to the entire light guide surface 10B and radiated to the display face. The display light beam L1 is made incident on the light guide plate 10 from its side face 10A. In the light guide plate 10, the side face 10A is formed in a rugged shape for preventing the reflection of the display light beam L1. The problem is also solved by the light source device 20 equipped with this light guide plate 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present application relates to a light guide plate used in a liquid crystal display device or the like and a light source device provided with the light guide plate.

  Conventionally, development of liquid crystal display devices has been promoted. As one form of this liquid crystal display device, a point or linear light source, a light guide plate that guides light emitted from the light source in the direction of the liquid crystal display surface, and the light emission direction of light from the light guide plate are sequentially corrected to obtain liquid crystal There is known a diffusing plate and a prism plate that allow the entire display surface to shine, and a liquid crystal display panel.

In such a liquid crystal display device, various devices have been devised in order to irradiate the entire liquid crystal display surface by effectively using light emitted from the light source. As an example of such a device, as shown in FIG. 1 of Patent Document 1, a liquid crystal display device in which an antireflection film is separately formed on at least a light incident surface of a light guide plate is known.
JP-A-8-106010

  However, in the light guide plate in which the antireflection film is separately formed on the light incident surface, since the antireflection film is formed after the light guide plate is molded, there is an inconvenience that time, cost, labor, etc. in the manufacturing process increase. there were.

  In this liquid crystal display device, the present application can reduce the time, cost, labor, and the like in the manufacturing process, and in order to effectively emit light emitted from the light source from the liquid crystal display surface, a novel light guide plate and light source An example of a problem is to provide a device.

  In order to solve the above problems, the invention according to claim 1 is arranged such that the light guide surface is aligned with the display surface of the display panel, and the display light emitted from an external light source is transmitted to the entire light guide surface. In the light guide plate that guides the light to the display surface and emits the light to the display surface, the display light is incident on the light guide plate from the side surface of the light guide plate, and the side surface reflects the display light on the side surface. It is the light guide plate characterized by being formed in the uneven | corrugated shape to prevent.

  In order to solve the above problems, the invention according to claim 6 is arranged such that the light guide surface is arranged along the display surface of the display panel, and the display light emitted from the external light source is transmitted to the entire light guide surface. In the light source device including the light guide plate that guides the light to the display surface and radiates to the display surface, the display light is incident on the light guide plate from the side surface of the light guide plate, and the side surface of the light guide plate is It is a light source device characterized in that it is formed in a concavo-convex shape for preventing reflection of the display light on the side surface.

  Below, with reference to drawings, the light-guide plate of this embodiment and a light source device provided with the same are demonstrated concretely.

  FIG. 1 is a schematic side view showing a side surface of a liquid crystal display device including the light guide plate and the light source device of the present embodiment. FIGS. 2 to 6 show display light incident on the light guide plate of the present embodiment. It is a figure which shows each aspect of the side surface to do.

(I) Embodiment First, as shown in FIG. 1, the light source device 20 of this embodiment has the light source 21 in the side surface 10A side in the light-guide plate 10 of this embodiment. Reflective sheets 24, 25, and 26 are provided around the side 10 </ b> D of the light guide plate 10 of the present embodiment that does not have the display panel 30, the facing surface side 10 </ b> C of the light source 21, and the periphery of the light source 21. The emitted display light L1 is reflected by dots, prisms, or pattern printing 12 provided on the surface 10D of the light guide plate 10 that does not have the display panel 30, and is emitted in the direction having the display panel 30. (See arrows L1 and L2 in FIG. 1). In addition, as shown in FIG. 1, the dot, prism, or pattern printing 12 may be provided on the inner surface side of the light guide plate 10 or may be provided on the outer surface side. The light guide surface 10B on which the display panel 30 of the light guide plate 10 of the present embodiment is provided is usually provided with a diffusion plate 22 and a prism plate 23, and the display light L1 emitted from the light source 21 is displayed. Light is emitted in a direction perpendicular to the panel 30 (see arrows L1, L2, and L3 in FIG. 1).

  As shown in FIG. 1, the light guide plate 10 of the present embodiment is arranged so that the light guide surface 10 </ b> B is along the display surface of the display panel 30, and displays the display light L <b> 1 emitted from the external light source 21. The light guide plate 10 is guided to the entire light guide surface 10 </ b> B and radiates to the display surface of the display panel 30, and the display light L <b> 1 enters the light guide plate 10 from the side surface 10 </ b> A of the light guide plate 10. Then, the side surface 10A of the light guide plate 10 on which the display light L1 is incident is characterized by being formed in an uneven shape that prevents reflection of the display light L1 on the side surface 10A. In particular, the position through which the display light L1 passes on the side surface 10A is formed in an uneven shape that prevents reflection of the display light L1 on the side surface 10A.

(Uneven shape)
The uneven shape formed on the side surface 10A on which the display light L1 of the light guide plate 10 is incident will be described with reference to FIGS.

  The uneven shape on the side surface 10A of the light guide plate 10 is a shape in which at least one of a pyramid, a cone, a prism, or a cylinder is arranged, or a pyramid, a cone, a prism, as described in (1) to (5) below. Or it can be set as the shape where at least any one of the cylinders was lined up as a concave shape.

  The uneven shape of the side surface 10 </ b> A of the light guide plate 10 will be described as a convex shape with respect to the light source 21 and a concave shape with respect to the light source 21. Further, each drawing referred to as a top view is a view of the side surface 10A of the light guide plate 10 as viewed from the light source 21 side in FIG.

  (1) When the concavo-convex shape is constituted by a shape in which pyramids are arranged, as shown in FIG. 2A, a schematic top view of the side surface 10A, and FIG. The concavo-convex shape can be configured by a shape in which the lines are arranged without gaps. At this time, a U-U enlarged sectional view passing through the apexes of adjacent pyramids in FIG. 2B is as shown in FIG.

  Further, when the concave and convex shape is constituted by a shape in which pyramids are arranged, a quadrangular pyramid is placed at the position shown in black in each figure as shown in the top reference diagram of the side surface 10A in FIGS. 3 (a) and 3 (b). The concavo-convex shape can also be configured by providing and a shape in which square pyramids are arranged at intervals on the reference plane. At this time, the VV enlarged sectional view passing through the apex of the adjacent pyramid in FIG. 3A and the XX enlarged sectional view passing through the apex of the adjacent pyramid in FIG. 3B are shown in FIG. As shown. When providing the quadrangular pyramids at intervals, the quadrangular pyramids can be provided in a checkered pattern as shown in FIG. 3A, or the width W2 of the quadrangular pyramids as shown in FIG. A quadrangular pyramid can also be provided at the same length interval.

  The interval between the quadrangular pyramids varies depending on the pitch and the maximum width of the quadrangular pyramids, and is not particularly limited as long as it has a function of preventing reflection, as will be described later.

  The shape in which the pyramids are arranged can be a shape in which pyramids such as a triangular pyramid and a hexagonal pyramid are arranged in addition to the quadrangular pyramids.

  (2) When the concavo-convex shape is constituted by a shape in which square columns are arranged, the concavo-convex shape can be constituted by a shape in which square columns are arranged on the reference plane. 3A and 3B, as shown in the top view of the side surface 10A, a rectangular column is provided at the position shown in black in each figure, and the rectangular columns are arranged at intervals on the reference plane. It can be. 4 shows a VV enlarged cross-sectional view passing through the center of the prism in FIG. 3A and an XX enlarged cross-sectional view passing through the center of the prism in FIG. As shown in FIG. 3 (a), the square pillars can be provided in a checkered pattern, or as shown in FIG. 3 (b), the square pillars are spaced at the same length as the width W3 of the square pillars. It can also be provided.

  The interval between the rectangular columns varies depending on the pitch and the maximum width of the rectangular columns and is not particularly limited as long as it has a function of preventing reflection, as will be described later.

  The shape in which the prisms are arranged can be a shape in which prisms such as a triangular prism and a hexagonal prism are arranged in addition to the quadrangular prism.

  (3) When the concavo-convex shape is constituted by a shape in which cones are arranged, the concavo-convex shape is constituted by a shape in which cones are continuously arranged on the reference surface as shown in a top view of the side surface 10A in FIG. can do. At this time, the YY enlarged sectional view passing through the apex of the adjacent cone is the same as the UU enlarged sectional view passing through the apex of the pyramid shown in FIG.

  Further, the shape in which the cones are arranged can be a shape in which the cones are arranged at intervals on the reference surface, as shown in another top view of the side surface 10A in FIG. At this time, the ZZ enlarged sectional view passing through the apex of the adjacent cone is the same as the VV enlarged sectional view passing through the apex of the pyramid or the XX enlarged sectional view shown in FIG. .

  The interval between the cones varies depending on the pitch and the maximum width of the cones, and is not particularly limited as long as it has a function of preventing reflection as described later.

  (4) When the concavo-convex shape is constituted by a shape in which cylinders are arranged, the concavo-convex shape can be constituted by a shape in which the cylinders are arranged on the reference surface. 5 (a) and 5 (b), as shown in a top reference view of the side surface 10A, a cylinder is provided at a position indicated by a circle in each figure, and a shape in which the cylinders are continuously arranged on the reference plane, or It can be made into the shape where it arranged at intervals. The ZZ enlarged sectional view passing through the center of the cylinder in FIG. 5B is the same as the VV enlarged sectional view or the XX enlarged sectional view passing through the center of the prism shown in FIG.

  The interval between the cylinders varies depending on the pitch and the maximum width of the cylinders and is not particularly limited as long as it has a function of preventing reflection, as will be described later.

  (5) When the concavo-convex shape is constituted by a shape in which at least one of a pyramid, a cone, a prism, or a cylinder is arranged as a concave shape, each shape described in the above (1) to (4) is separated from the reference plane. The concavo-convex shape can be constituted by the shape inverted up and down.

  Specifically, the shape in which the pyramids are arranged in a concave shape is a shape obtained by inverting the shape in which the pyramids described in the above (1) are arranged upside down with respect to the reference plane. The shape in which the prisms are arranged in a concave shape is a shape obtained by inverting the shape in which the prisms described in (2) above are inverted up and down with a reference plane as a boundary. The shape in which the cones are arranged in a concave shape is a shape obtained by inverting the shape in which the cones described in (3) above are inverted up and down with respect to the reference plane. The shape in which the cylinders are arranged in a concave shape is a shape in which the shape described in (4) above is inverted up and down with the reference plane as a boundary. For reference, FIG. 6 shows an enlarged cross-sectional view of a shape obtained by inverting the shape in which the pyramids described with reference to FIG. 2 are reversed and in which the pyramids are arranged in a concave shape.

  Note that the shape of the side surface 10A of the light guide plate 10 may be a combination of these in addition to the shapes described in the above (1) to (5). The shape of the side surface 10A of the light guide plate 10 is, for example, a combination of a convex shape and a concave shape with respect to the reference surface in the enlarged cross-sectional views shown in FIGS. 2 (c), 3 (c), 4 and 6. It may be a shape. Further, the shape of the side surface 10A of the light guide plate 10 is not limited to the shape in which the shapes described in the above (1) to (5) are regularly arranged, and each shape is provided by selecting a random position. May be.

(Pitch, height, maximum width of uneven shape)
The values of the pitch, height, and width of the concavo-convex shape on the side surface 10A of the light guide plate 10 described in (1) to (5) above are appropriately determined within a range having a function of preventing reflection.

  Specifically, the concavo-convex shape on the side surface 10A of the light guide plate 10 preferably has a pitch that is ½ or less the wavelength of visible light. Specifically, the pitch of the concavo-convex shape is preferably 100 to 500 nm. The wavelength of visible light is generally about 360 to 830 nm (from JIS Z 8120 visible light).

  Here, the pitch of the concavo-convex shape is a pyramid, a cone, and when these concave shapes are provided, as shown in FIG. 2 (c), FIG. 3 (c), and FIG. The distances between the vertices are defined as P1, P2, and P4. In addition, when the concave and convex shapes are provided with prisms, cylinders, or concave shapes thereof, as shown in FIG. 4, in the enlarged cross-sectional view passing through the centers of the adjacent prisms or cylinders, It is defined as the distance P3 between the centers.

  Moreover, although the uneven | corrugated shape in 10 A of side surfaces of the light-guide plate 10 is not specifically limited about the value of the height, Usually, it becomes smaller than the value of twice the above-mentioned pitch.

  Here, in the case where each shape is arranged as a convex shape, the height of the concavo-convex shape is the maximum of each shape from the reference plane as shown in FIG. 2 (c), FIG. 3 (c), and FIG. The distances H1, H2, and H3 to the upper position are defined. In the case where the shapes are arranged in a concave shape, the height of the uneven shape is defined as a distance H4 from the reference plane to the lowest position of each shape as shown in FIG.

  Furthermore, the uneven shape on the side surface 10A of the light guide plate 10 is preferably in a state in which the unevenness is arranged without a gap, as shown in FIG. 2 (b) or FIG. 5 (a). Therefore, the maximum width of each shape of the unevenness is not particularly limited, but is often equal to the above pitch.

  Here, the maximum width of the pyramid or prism is a straight line passing through the center when the pyramid or prism is an enlarged sectional view passing through the center of the pyramid or prism as shown in FIGS. 2 (c), 3 (c), 4 and 6. Are defined as the distances W1, W2, W3, and W4 between both ends of the pyramid or prism. The maximum width of the cone or cylinder is the length indicated by the distances W1, W2, W3, W4 between the ends of a straight line passing through the center of the circle in the same enlarged cross-sectional view, and is defined as the diameter of the circle.

  The uneven pitches P1, P2, P3, P4, heights H1, H2, H3, H4, maximum widths W1, W2, W3, W4 formed on the side surface 10A of the light guide plate 10 are not constant, and are not constant. It may be changed.

  Since the side surface 10A of the light guide plate 10 is formed in an uneven shape, reflection of the display light L1 incident from the light source 21 is prevented.

  Moreover, the position where the display light L1 passes through the side surface 10A of the light guide plate 10 is formed in an uneven shape that prevents the reflection of the display light L1. The side surface 10A of the light guide plate 10 may be formed not only in a position where the display light L1 passes, but also on the entire surface of the side surface 10A in an uneven shape that prevents the reflection of the display light L1.

(Material, size, manufacturing method of light guide plate)
Here, the material of the light guide plate 10 is not particularly limited, but plastic resin is usually used, and acrylic resin or polycarbonate resin is preferably used.

  The size and thickness of the light guide plate 10 (the distance between the light emission surface (light guide surface) 10B on the display panel 30 side in FIG. 1 and the facing surface 10D) are also determined appropriately by the provided device, and are particularly limited. Not.

  The manufacturing method of the light-guide plate 10 is not specifically limited, Usually, it can manufacture in the way which shape | molds a plastic material, For example, it can manufacture as follows. First, a master plate having a concavo-convex shape as described above is formed using nickel or silicon at a position corresponding to the side surface 10A of the light guide plate 10, and a plurality of molds are manufactured using the master plate. A plastic material for producing the light guide plate 10 is heated and poured into the mold, cooled and cured, and the cured light guide plate 10 is peeled from the mold to manufacture the light guide plate 10. It is also possible to manufacture the light guide plate 10 by using a photocurable resin as the material of the light guide plate 10 and curing the molded resin by irradiation with light (including ultraviolet rays and electron beams).

(Ii) Modifications In the light source device 20 in FIG. 1, the position of the light source 21 is provided on one side of the light guide plate 10. However, the present invention is not limited to this, and light sources are provided on both sides of the light guide plate 10. It is good also as a various form. Further, the light source 21 may be a point light source provided in a spot shape at several places, or may be a linear light source provided in a straight line next to the light guide plate 10. When a point light source is used, processing for improving the luminance uniformity of surface light emission from the light guide plate 10 may be performed on the side surface 10A of the light guide plate 10 in addition to the above-described uneven shape.

  The type of the light source 21 is not particularly limited, but a cathode fluorescent lamp (CFL) or a light emitting diode (LED) is generally used.

  When the position of the light source 21 is only on one side of the light guide plate 10 as in the light source device 20 in FIG. 1, the light source 21 is not included in the thickness of the light guide plate 10 on the side having the light source 21. The side thickness may be reduced. In addition, as long as the above-described uneven shape is formed on the side surface 10A of the light guide plate 10, other processing may be performed on the side surface 10A and the other surfaces 10B, 10C, and 10D.

  Further, the diffusion plate 22 and the prism plate 23 in FIG. 1 can be formed from a plurality of layers as required.

  The display panel 30 in FIG. 1 is a conventionally known display panel in which a liquid crystal display element composed of various components such as a color filter, a black matrix, a liquid crystal, an alignment film, and an electrode is provided on a base material. A liquid crystal display device 40 is formed from the display panel 30 and the light source device 20 of the present embodiment described above.

  The light guide plate 10 and the light source device 20 of the present embodiment are mainly provided in the liquid crystal display device 40. The use of the liquid crystal display device 40 is not particularly limited, and the liquid crystal display device 40 is used for various devices such as a television receiver, a personal computer display device, a mobile phone, and a digital camera.

  In FIG. 1, the light guide plate 10 is on the back side of the display surface of the display panel 30 and represents a so-called transmissive liquid crystal display device 40, but the light guide plate is on the display surface side of the display panel and is a so-called reflective type. Alternatively, a front light type liquid crystal display device may be used.

  The light guide plate 10 of the present embodiment described above is arranged so that the light guide surface 10B is along the display surface of the display panel 30, and the display light L1 emitted from the external light source 21 is applied to the entire light guide surface 10B. In the light guide plate 10 that guides and radiates to the display surface, the display light L1 enters the light guide plate 10 from the side surface 10A of the light guide plate 10, and the side surface 10A reflects the display light L1 on the side surface 10A. It is formed in the uneven | corrugated shape which prevents this.

  Therefore, the uneven shape formed on the side surface 10A of the light guide plate 10 can suppress the reflection of the display light L1 incident on the light guide plate 10 from the light source 21 and provide a novel light guide plate 10. Therefore, the light emitted from the light source 21 can be effectively emitted from the light guide surface 10B, and the light emission efficiency in the display panel 30 can be improved.

  The light guide plate 10 can provide a liquid crystal display device 40 or the like having a brighter panel display surface if the other conditions are the same as those of the prior art. Also, from another point of view, it is possible to obtain the same brightness of the panel display surface as in the prior art with lower power consumption than in the past, and even if other members for improving the luminous efficiency are omitted, the same as in the past The brightness of the panel display surface can be obtained.

  Furthermore, in manufacturing the light guide plate 10, the manufacturing process can be omitted as compared with a conventional light guide plate provided with an antireflection film, which is advantageous in terms of time, cost, labor, and the like.

  The light guide plate 10 of this embodiment is characterized in that the position where the display light L1 passes on the side surface 10A is formed in a concavo-convex shape that prevents reflection of the display light L1 on the side surface 10A.

  Therefore, since the position through which the display light L1 passes on the side surface 10A is formed in an uneven shape that prevents reflection of the display light L1, reflection of light incident on the light guide plate 10 from the light source 21 is surely suppressed. be able to.

  In the light guide plate 10 of this embodiment, the pitches P1, P2, P3, and P4 of the concavo-convex shape on the side surface 10A have a length that is 1/2 or less of the wavelength of visible light. The pitches P1, P2, P3, and P4 of the concavo-convex shape in 10A are 100 to 500 nm.

  Therefore, by setting the uneven pitches P1, P2, P3, and P4 of the side surface 10A within such a range, reflection of the display light L1 incident from the light source 21 can be efficiently prevented.

  In the light guide plate 10 of this embodiment, the uneven shape on the side surface 10A is a shape in which at least one of a pyramid, a cone, a prism, or a cylinder is arranged, or at least one of a pyramid, a cone, a prism, or a cylinder. It is characterized by the shape in which the ridges are arranged as concave shapes.

  Therefore, by making the uneven shape formed on the side surface 10A specifically the above-described shape, reflection of the display light L1 incident from the light source 21 can be efficiently prevented.

  Furthermore, the light source device 20 of the present embodiment described above is arranged so that the light guide surface 10B is along the display surface of the display panel 30, and the display light L1 emitted from the external light source 21 is transmitted to the light guide surface 10B. In the light source device 20 including the light guide plate 10 that is guided to the whole and radiates to the display surface, the display light L1 enters the light guide plate 10 from the side surface 10A of the light guide plate 10, and the side surface 10A of the light guide plate 10 is provided. However, it is formed in the uneven | corrugated shape which prevents reflection of the display light L1 in 10 A of side surfaces.

  Therefore, the uneven shape formed on the side surface 10A of the light guide plate 10 can suppress the reflection of the display light L1 incident on the light guide plate 10 from the light source 21, and provide a novel light source device 20. Therefore, the light emitted from the light source 21 can be effectively emitted from the light guide surface 10B, and the light emission efficiency in the display panel 30 can be improved.

  The light source device 20 including the light guide plate 10 can provide the liquid crystal display device 40 and the like having a brighter panel display surface if the other conditions are the same as those in the related art. Also, from another point of view, it is possible to obtain the same brightness of the panel display surface as in the prior art with lower power consumption than in the past, and even if other members for improving the luminous efficiency are omitted, the same as in the past The brightness of the panel display surface can be obtained.

  Furthermore, in manufacturing the light source device 20 including the light guide plate 10, the manufacturing process can be omitted as compared with a light source device including a light guide plate provided with a conventional antireflection film, and time, cost, and labor are reduced. Etc. are advantageous.

It is a side surface schematic diagram showing the side of a liquid crystal display provided with the light guide plate and light source device of this embodiment. It is a figure explaining a side surface in the case of making the uneven | corrugated shape of the side surface in which the display light in the light-guide plate of this embodiment enters into the aspect with which the quadrangular pyramid was located in a line. It is a figure explaining a side surface when the uneven | corrugated shape of the side surface in which the display light in the light-guide plate of this embodiment enters into another aspect with which the square pyramid arranged. It is an expanded sectional view at the time of making the uneven | corrugated shape of the side surface in which the display light in the light-guide plate of this embodiment enters into the aspect with which the square pillar was located in a line. It is a top view at the time of setting the uneven | corrugated shape of the side surface in which the light for a display in the light guide plate of this embodiment enters as the aspect with which the cone or the cylinder was located in a line. It is an expanded sectional view at the time of making the uneven | corrugated shape of the side surface in which the display light in the light-guide plate of this embodiment injects into the aspect in which the pyramid was arranged as a concave shape.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Light guide plate 10A ... Side surface where the display light of a light guide plate injects 10B ... Light guide surface of a light guide plate 10C ... Opposite surface of the light source in a light guide plate 10D ... Surface which does not have a display panel in a light guide plate 12 ... Dot, prism or Pattern printing 20 ... Light source device 21 ... Light source 22 ... Diffusion plate 23 ... Prism plate 24, 25, 26 ... Reflection sheet 30 ... Display panel 40 ... Liquid crystal display device L1, L2, L3 ... Display light P1, P2, P3, P4 ... Uneven shape pitch H1, H2, H3, H4 ... Uneven shape height W1, W2, W3, W4 ... Maximum width of pyramids, cones, prisms, and cylinders that make up the uneven shape (circle is the diameter)

Claims (6)

In the light guide plate that is arranged so that the light guide surface is along the display surface in the display panel, guides the display light emitted from the external light source to the entire light guide surface, and radiates it to the display surface,
The display light is incident on the light guide plate from the side surface of the light guide plate,
The light guide plate, wherein the side surface is formed in a concavo-convex shape that prevents reflection of the display light on the side surface.   The light guide plate according to claim 1, wherein a position where the display light passes on the side surface is formed in an uneven shape that prevents reflection of the display light on the side surface.   3. The light guide plate according to claim 1, wherein a pitch of the concavo-convex shape on the side surface is ½ or less of a wavelength of visible light.   The light guide plate according to any one of claims 1 to 3, wherein the pitch of the concavo-convex shape on the side surface is 100 to 500 nm.   The uneven shape on the side surface is a shape in which at least one of a pyramid, a cone, a prism, or a cylinder is arranged, or a shape in which at least one of a pyramid, a cone, a prism, or a cylinder is arranged as a concave shape. The light guide plate according to any one of claims 1 to 4, wherein the light guide plate is characterized by the following. In a light source device including a light guide plate that is arranged so that a light guide surface is along a display surface in a display panel, guides display light emitted from an external light source to the entire light guide surface, and emits the light to the display surface.
The display light is incident on the light guide plate from the side surface of the light guide plate,
The light source device, wherein the side surface of the light guide plate is formed in an uneven shape that prevents reflection of the display light on the side surface.

Images