JP2000284284A - Optical member with reflective and transmissive functions - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light transmission plate which exhibits excellent performances in its brightness and visibility in both transmissive and reflective modes in the case of mounting and driving it on a reflective liquid crystal display device without a transmission reflection plate by imparting a transmissive and a reflective functions with high transmissivity and reflectivity to the light transmission plate itself. SOLUTION: A base material layer with projecting shapes, of which the tips of the projecting parts are directed to the reverse direction with respect to the observer's side, is arranged inside a light transmission plate or on a light exiting face. Besides light transmissive gaps are formed within the layer and besides reflection layers are arranged on the inside and outside surfaces of the projecting parts. The light transmission plate is arranged so as to directly transmit a part of light from its inside and to reflect more than once a part of the residual light with the reflection layers on the outside surfaces of the projecting parts, transmit it through the light transmissive gaps formed within the layer and make it reach to the observer, and so as to reflect a part of light from the observer's side with the reflection layers on the inside surfaces of the projecting parts and make it reach to the observer. This kind of the light transmission plate is used in a backlight unit for a liquid crystal and for a liquid crystal display device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a light guide plate having a transmission / reflection function for realizing high transmittance and reflectance, and a transmission / reflection type liquid crystal display device equipped with the same.

[0002]

2. Description of the Related Art In recent years, liquid crystal display devices have been used in various fields such as notebooks, personal computers, electronic notebooks, portable information terminals, amusement devices, and mobile phones. Of these, transmissive and transflective liquid crystal display devices are often used for portable devices. The transflective liquid crystal display device is used as a reflection type using natural light or indoor light in the daytime or in a bright place (hereinafter referred to as a reflection state).
At night or in a dark place, it is used as a transmission type using a backlight (hereinafter referred to as a transmission state). As a transflective liquid crystal display device, a first polarizer / liquid crystal cell (TN cell, S
There is a known arrangement in which a configuration of (TN cell) / second polarizing plate / transmission / reflection plate / backlight unit is arranged. In order to achieve both a reflection function and a transmission function in these display devices, for example, inorganic particles such as pearl mica having a high refractive index are dispersed in a matrix. For example, a transflective plate having a function of transmitting light between these particles is used. Japanese Patent Application Laid-Open No. 55-103583 describes a reflection / transmission member having a pattern in which light reflecting portions and light transmitting portions are alternately arranged. JP-A-55-46707 discloses that transparent and / or translucent particles such as metal powder such as aluminum oxide, titanium oxide, aluminum powder, tin powder, gold powder and silver powder are uniformly dispersed in an adhesive material layer. Is disclosed.

[0003]

However, when the conventional transmission / reflection plate is mounted on a reflection type liquid crystal display and driven, the brightness and visibility are not always sufficient. FIG. 1 is a diagram showing the principle of a conventional semi-transmissive semi-reflective plate in which inorganic particles having a high refractive index such as pearl mica and particles having a high reflectivity such as a metal are dispersed in a matrix. The downward direction in FIG. 1 corresponds to the back side, and the upward direction corresponds to the observer side. As shown in FIG. 1, since there is a component of light coming from the back surface and reflected by inorganic particles or metal particles and returning to the back surface, when used in a transmission state, substantially only light leaking from a gap between particles is used. There is a problem that the light use efficiency is poor and the transmittance cannot be increased. That is,
In order to obtain a high transmittance, it is necessary to reduce the content of particles or increase the transmittance, and the reflectance decreases. On the other hand, in order to increase the reflectance, it is necessary to increase the content of particles or to increase the reflectance (decrease in transmittance), and there is a problem in that the transmittance decreases. An object of the present invention is to provide the light guide plate itself with a transmission / reflection function having high transmittance and reflectance, and to mount the light guide plate on a reflection type liquid crystal display device and drive the transmission / reflection plate as described above. An object of the present invention is to provide a light guide plate that exhibits excellent performance in terms of brightness and visibility in both a transmission state and a reflection state without using the light guide plate.

[0004]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and as a result, by providing a light reflecting layer having a specific shape on a light guide plate, a high transmittance is maintained in a transmission state. In addition, the present inventors have found that a high reflectivity can be obtained even in the reflection state, and a light guide plate which is bright and has excellent visibility can be obtained in either state. Thus, the present invention has been completed.

That is, the present invention provides the following (1) to
(7) is provided. (1) A layer of a base material having a convex shape such that the tip of the convex portion is directed in the opposite direction to the observer side is provided inside the light guide plate or on the light emitting surface, and a gap in a transmission state is formed between the layers. The reflection layer is formed on the inner surface of the projection and the outer surface of the projection, and a part of light from the inside of the light guide plate passes directly, and a part of the remaining light is a reflection layer on the outer surface of the projection. At least once to reach the observer through the gap in the transmission state formed between the layers, and a part of the light from the observer side is reflected by the reflective layer on the inner surface of the convex portion and the observer A light guide plate, wherein the light guide plate is arranged so as to reach the light guide plate. (2) The shape of the layer having a convex shape is a straight cone, an oblique cone,
The light guide plate according to the above (1), which is at least one kind of a structure selected from a pyramid, an oblique pyramid, a wedge shape, and a convex polygon, and a structure having a partial shape thereof. (3) The above (1), wherein the shape of the layer having a convex shape is at least one or more of a structure selected from a spherical surface, an elliptical surface, a paraboloid, and a hyperboloid, and a structure having a partial shape thereof. Light guide plate. (4) The light guide plate according to any one of (1) to (3), wherein at least one bottom surface of the shape of the layer having a convex shape is a light reflection layer. (5) The light guide plate according to any one of (1) to (3), wherein at least one or more bottom surfaces of the layers having the convex shape are layers having both a light reflection layer and a light transmission layer. (6) A liquid crystal backlight unit using the light guide plate according to (1) to (5). (7) A liquid crystal display device using the light guide plate according to (1) to (5) or the liquid crystal backlight unit according to (6).

[0006]

Next, the present invention will be described in detail. Hereinafter, with respect to the light guide plate of the present invention, an example of the structure of a layer having a convex shape such that the tip of the convex portion faces in a direction opposite to the observer side, on the light guide plate or on the light emitting surface, with reference to the drawings. Although described below, the present invention is not limited to the illustrated example. In the detailed description of the present invention, a liquid crystal display device will be described as an example, but the application of the present invention is not limited to the liquid crystal display device.

FIG. 2 shows a light guide plate in which a conical reflection layer is formed on a light exit surface, showing the principle of the present invention. In FIG. 2, the downward direction in the figure corresponds to the light source side (inside of the light guide plate) of the liquid crystal display, and the upward direction in the opposite direction corresponds to the observer side.
In the transmissive state with the backlight turned on, most of the light that enters the light guide plate from the backlight travels straight through the gap between the conical reflection layers or is reflected by the reflection layer on the conical slope, and passes through the gap between the cones. To the observer side. In the reflection state where natural light and indoor light are sufficiently obtained, most of natural light and room light from above are reflected by the reflective layer and reach the observer side except for passing through the gap between the reflective layers to the back. . In this case, the ratio of the reflected light to the irradiation light is substantially equal to the ratio of the projected area of the reflective layer in the transmission / reflection plate from the observer side. In addition, a part of the light passing through the gap between the reflection layers to the back reaches the observer side by the same ray trajectory as the light from the backlight, so that the utilization efficiency of the reflected light is further improved. Further, since the transmission / reflection plate is not used, there is no light absorption loss by the transmission / reflection plate itself. Therefore, as compared with the conventional system using a normal transmission / reflection plate, the light use efficiency is greatly improved in both the transmission state and the reflection state.

In the present invention, the shape of the layer having a convex shape is at least a structure selected from a straight cone, an oblique cone, a pyramid, an oblique pyramid, a wedge shape, and a convex polygon, and a structure having a partial shape thereof. One or more types may be mentioned. The apex angle of a right cone or oblique cone is 5 ° to 90 °, and the apex angle of a pyramid, oblique pyramid, wedge or convex polygon is 5 ° to 90 °.
In addition, at least one kind of a structure in which the shape of the layer having a convex shape is selected from a spherical surface, an elliptical surface, a paraboloid, and a hyperboloid, and a structure having a partial shape thereof is also included.

Although there is no particular limitation on the apex angle of the cone,
5 to 90 ° for efficient transmission of light from the back
Is preferred. If the angle is less than 5 °, the ratio of the height to the base becomes large, so that the reflection plate becomes too thick, which is not practically preferable. If it exceeds 90 °, the transmittance will decrease. The height of the cone is not particularly limited, and may be any range that does not hinder the layout of each member or the entire display device in practical use. The interval between the vertices of the cone is not particularly limited. The diameter of the cone is not particularly limited, except that it is geometrically defined by the apex angle and height of the cone. For example, when used for a liquid crystal display, from the viewpoint of preventing moiré and uneven brightness, several μm to several mm are used.
The degree is preferred.

The method of arranging the cones is not particularly limited, and the bottoms may be in contact with each other as shown in FIG. 4 or may be arranged with an interval between the bottoms as shown in FIG. In addition, the apexes of the cones may all be in the same direction, or may not be in the same direction. It is also possible to dispose a reflective layer having the shape described in the present invention or another shape such as a small cone in the gap between the cones. When the cones are arranged on the same plane, if the arrangement interval of the cones is too wide, the ratio of the total cone bottom area to the total plane area of the plane is too small, and the reflectance of light from the observer side decreases. On the other hand, between the cones arranged on the same plane, smaller cones are arranged so that the bottom surface is coplanar, and if the ratio of the total cone bottom area to the total plane area of the plane becomes too large, observation from inside the light guide plate The transmittance of light traveling toward the user decreases. In either case, the practical performance is impaired. In such an arrangement, the ratio of the conical bottom area to the total plane area in the same plane parallel to the light emission surface of the light guide plate is 30 to 98%, and more preferably 50 to 98%. Preferably it is in the range of 95%.

Similarly, in the case of a pyramidal reflective layer, the apex angle of the pyramid is not limited, but is preferably between 5 and 90 ° in order to transmit light efficiently. If the angle is less than 5 °, the ratio of the height to the bottom becomes large, so that the light guide plate becomes too thick, which is not practically preferable. If it exceeds 90 °, the transmittance will decrease. The height of the pyramid is not particularly limited, and may be any range that does not hinder the layout of each member or the entire display device in practical use. The interval between the vertices of the pyramid is not particularly limited. The number of sides of the pyramid is not particularly limited as long as it is three or more. There is no particular limitation on the reflective layer of other shapes as long as it has a convex shape on the back side.

[0012] The shape and arrangement of these reflective layers are ultimately determined by the transmission efficiency of light from inside the light guide plate when a backlight is used, and the natural light or indoor light in a reflective display when no backlight is used. It is determined in consideration of optimization with reflection efficiency.

On the upper surface of the light guide plate, a normal transmission / reflection plate may be arranged as necessary. Further, if necessary, a light diffusing plate for making the intensity distribution of the transmitted light and the reflected light uniform may be provided.

An example of the structure of a layer having a convex shape according to the present invention will be described below with reference to the drawings. (I) The light guide plate shown in FIG. 2 having a conical concave hole shape on the light guide plate surface portion (light emitting portion). In FIG. 2, a is an example of a locus of light transmission from the inside of the light guide plate to the observer side, and b is an example of a locus of reflection of light from the observer. (Ii) A light guide plate shown in FIG. 3 in which the light guide plate surface portion (light emitting portion) has a conical shape having a vertex on the side opposite to the observer side, and further has a light reflection layer on the bottom surface of the cone. (Iii) Surface part (light emitting part) of light guide plate surface part shown in FIG.
Is a light guide plate having an oblique cone shape having a vertex on the side opposite to the observer side, and further having a light reflecting layer on the bottom surface of the oblique cone. (Iv) Surface part of light guide plate surface (light emitting part) shown in FIG.
Is a quadrangular pyramid shape having a vertex on the side opposite to the observer side, and further having a light reflecting layer on the bottom surface of the quadrangular pyramid. As described above, at least one or more bottom surfaces of the layer having a convex shape according to the present invention can be a light reflecting layer or a layer having both a light reflecting layer and a transmitting layer. Further, a layer having both a light reflection layer and a light transmission layer may be provided on a part or all of the plane on the observer side. further,
As in the above example, it is not always necessary to make the size of the cone or the like and the positions of the vertices uniform. For example, a structure as shown in FIG. 6 is also possible. Also, a combination of different shapes or a combination of these partial shapes is possible.

The base material of the light guide plate of the present invention includes, for example,
A transparent plate such as a glass plate or a resin selected from one or more transparent or translucent resins such as an acrylic resin, a styrene resin, a polyester resin, and a polycarbonate resin. The thickness of the substrate is not particularly limited as long as the performance as the light guide plate is not impaired.
mm.

As a method for forming the surface of the base material into the above-mentioned shape, for example, the following methods are mentioned. 1) A method in which a negative mold having a desired shape is formed on a roll or a master and a shape is imparted by a transfer method. 2) A method in which a negative mold having a desired shape is formed on a roll or a master, a thermosetting resin is filled in a concave portion, and the heat-cured resin is separated from the negative mold. 3) A negative mold having the desired shape is formed on a roll or a master, and an ultraviolet or electron beam curable resin is applied and filled into the recesses. Then, the ultraviolet rays are applied while the transparent substrate film is coated on the intaglio through the resin liquid. Alternatively, a method of irradiating an electron beam and peeling the cured resin and the substrate film to which the resin is adhered from the intaglio. 4) A solvent casting method in which a negative mold having a desired shape is formed on a casting belt, and the desired shape is imparted during casting. 5) A method in which a resin that is cured by light or heating is printed on a transparent substrate and cured by light or heating to form a convex or concave shape. 6) A method of cutting the surface with a machine tool or the like.

In order to appropriately scatter the reflected light in the reflection state, the surface of the shape may be roughened, and examples thereof include the following methods. 1) A method in which the surface of a negative type plate is roughened in advance. 2) A method in which a resin in which organic / inorganic fine particles are mixed is pressed against a negative plate. 3) A method of sandblasting the surface after creating a desired shape. 4) A method of forming a target shape, forming a reflective layer, and then depositing and coating a coating liquid containing inorganic / organic fine particles on the surface.

The light emitting surface and the light reflecting surface of the light guide plate of the present invention can be roughened by the above-mentioned method to provide a diffuse reflection function, if necessary.

The light reflecting surface of the light guide plate of the present invention may be
By the same method as the above-described method of forming the surface portion of the base material, it is possible to adjust the light reflection direction by providing irregularities such as wedges, pyramids, and cones.

The method for forming the light reflection layer of the present invention will be described below. The method of forming the reflective layer is also possible by a method of forming a reflective surface by combining materials having different refractive indexes,
The layer can be formed by the following method.

1. A method of depositing metal or white pigment. Examples of the metal include aluminum and silver. In addition, as white pigments, titanium oxide, zinc white, lithopone, lead white, calcium leadate, basic lead sulfate, tin oxide, zirconium oxide, barite, carbonated lime, precipitated calcium carbonate, alumina white, silicic acid, silicate, Examples include clay. The method of depositing these substances and the thickness of the deposition are not particularly limited as long as the reflected light distribution characteristics of the substrate surface do not change due to the deposition.For example, vacuum deposition, sputtering, ion plating, etc. The method used for forming the thin film can be appropriately selected and used depending on the type of the base material. The thickness of the deposition may be in a range where a high reflectance can be obtained.
It is about 00 °. Next, in order to make a part of the base material surface in a transmission state, a mask is formed at a place where it is desired to be a transmission part before coating, and after performing vapor deposition on the entire surface, the reflection part is removed together with the mask to form a transmission part. And the like.

When deposition is performed using silver or the like as a metal having high reflectance characteristics, it is preferable to provide a protective film on the surface of the silver deposition layer in order to prevent deterioration of the deposition layer.
Although there is no particular limitation as the protective film, for example, acrylic resin, epoxy resin, polyester resin, urethane resin,
Examples thereof include a coating film of an alkyd resin, and for example, coating can be performed by a usual method such as roll coating, gravure coating, spray coating and the like. Further, a thin film of a metal such as copper or inconel, or an inorganic substance such as SiO ₂ can be used. The thickness of the protective film may be within a range that can prevent oxidation of silver, and is, for example, 5 nm to 10 μm.
Range.

2. A method of depositing a glossy inorganic and / or organic substance. The method of depositing an inorganic or organic substance and the thickness of the deposition are as follows:
There is no restriction as long as the reflected light distribution characteristic of the substrate surface does not change by vapor deposition, and for example, a method usually used to form a metal thin film such as a vacuum vapor deposition method, a sputtering method, and an ion plating method is used. It can be appropriately selected and used depending on the type of the base material. The thickness of the vapor deposition is, for example, about 50 ° to 5000 °. Also, in order to make a part of the substrate surface in a transparent state, a mask is formed at the place where it is desired to be a transparent part before coating, a vapor-deposited over the entire surface, and the reflective part is peeled off together with the mask to form a transparent part And the like.

3. A method of coating a metal powder and / or a white pigment via a resin binder. The powder is not particularly limited as long as it has a luster such as aluminum, aluminum oxide and titanium oxide. There is no particular limitation as the resin binder, for example,
Acrylic resin, urethane resin, epoxy resin, polyester resin, alkyd resin and the like can be mentioned. For example, coating can be performed by a usual method such as roll coating, gravure coating, spray coating and the like. The coating thickness is about 5 μm to 200 μm. The resin binder may have adhesive properties.
Also, in order to make a part of the base material surface in a transparent state, a mask is formed at the place where you want to be a transparent part before coating, and after coating the entire surface, the reflective part is peeled off together with the mask to form a transparent part And the like.

4. A method of coating glossy inorganic and / or organic fine particles via a resin binder. Examples of the inorganic and / or organic fine particles having glossiness include, for example, pearl pigments such as synthetic or natural mica coated with titanium dioxide, plate-like fish scale foil, and fine particles having pearl luster such as hexagonal plate-like basic lead carbonate. Yes, and is not particularly limited. The resin binder is not particularly limited as described above.

The reflection layer thus obtained may be a single layer or a multilayer by performing the above operation a plurality of times.
Further, the reflection layer can be protected by a transparent resin or the like.

In the present invention, the obtained light guide plate may be formed such that the bottom of the layer having the convex shape is flattened by filling the concave portions inside the layer having the convex shape on the surface with resin or the like. I can do it. For example, the following method can be mentioned. (A) A method of filling an ultraviolet curable resin or an electron beam curable resin, leveling the surface, and then irradiating with an ultraviolet ray or an electron beam to cure the resin. (A) A method in which a thermoplastic resin is filled in a molten state, and is smoothed by pressing with a roll. A method of fitting or bonding a sheet having a negative shape (convex shape) or a shape in which an upper portion of the negative shape is missing with a concave portion inside a layer having a convex shape. The light reflecting layer can be formed on the bottom surface of the flattened layer having the convex shape by the above-described method.

The light guide plate of the present invention may be used by laminating a semi-transmissive semi-reflective plate in which particles such as pearl mica are dispersed, a light diffusing member such as a milky white film, and a brightness enhancing member such as a prism lens.

A cold cathode tube lamp using the light guide plate of the present invention,
A transflective backlight unit can be provided in combination with a reflector or the like. By mounting such a transflective backlight unit on a liquid crystal display device, a transflective liquid crystal display device with excellent visibility can be obtained.

[0030]

The transflective liquid crystal display device using the light guide plate of the present invention has better brightness and visibility in both the transmissive state and the reflective state than the conventional transflective liquid crystal display device. In addition, when used in a battery-powered portable display device, it can be used for a long time.

[0031]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to the examples.

Example 1 A methyl methacrylate resin plate having a thickness of 4 mm was drilled to have a vertical angle of 30 ° and a diameter of 1 as shown in FIG.
A molded article having a large number of conical concave holes having a diameter of 100 mm and a distance between bottom surfaces of 100 μm was prepared. Next, 10 parts by weight of powdered titanium oxide TT051-A (manufactured by Ishihara Sangyo Co., Ltd.)
Polyvinyl butyral (manufactured by Denki Kagaku Kogyo, molecular weight about 20
00) A dispersion composed of 1.7 parts by weight of methanol and 28 parts by weight of methanol was charged, methanol was evaporated and removed by natural drying, and the conical concave hole was filled with a composition of powdered titanium oxide and polyvinyl butyral. A light guide plate was obtained. The transmittance of vertical light from the conical vertex side of the obtained light guide plate was 40%, and the reflectance of light from the opposite direction was 65%, both of which were high. A transflective liquid crystal display device is obtained by combining the obtained light guide plate with a cold cathode tube, a reflector and the like. When this liquid crystal display device is driven, it is bright and has good visibility. Also,
It is bright and has excellent visibility even when used in a reflective type where the backlight is not lit.

Example 2 Polymethyl methacrylate is embossed using a conical-convex-shaped metal roll to produce a molded body having a large number of conical concave holes on the surface. Aluminum is deposited on this surface to a thickness of about 2000 °. After the vapor deposition, only the planar portion of the vapor deposition layer on the embossing side surface except for the conical concave hole is polished and removed to obtain the light guide plate of FIG. A transflective liquid crystal display device is obtained using the obtained light guide plate. When this liquid crystal display device is driven, the visibility is excellent without turning on the backlight.

Example 3 A light guide plate as shown in FIG. 4 in the same manner as in Example 1 except that the shape of the light reflection layer is an oblique cone inclined at 30 ° from the normal to the plate toward the light source. Get. A transflective liquid crystal display device is obtained using the obtained light guide plate. When this liquid crystal display device is driven, the visibility is excellent without turning on the backlight.

[Brief description of the drawings]

FIG. 1 is a diagram showing a normal transflective plate.

FIG. 2 is a perspective view showing the principle of the present invention.

FIG. 3 is a perspective view showing a second embodiment of the present invention.

FIG. 4 is a perspective view showing a third embodiment of the present invention.

FIG. 5 is a perspective view showing an example of the present invention.

FIG. 6 is a plan / side view showing an example of the present invention.

FIG. 7 is a plan / side view showing the first embodiment of the present invention.

[Explanation of symbols]

 a: locus of light transmission from the light source side b: locus of light reflection from the observer 1: light source (cold cathode tube) 2: reflector 3: light guide plate having the structure of the present invention 4: light reflection layer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09F 9/00 332 G09F 9/00 332E (72) Inventor Koichi Fujisawa 6 Kitahara 6 Tsukuba, Ibaraki Sumitomo Chemical Co., Ltd. In-house F term (reference) 2H038 AA55 BA06 2H091 FA14Z FA23Z FA41Z FB07 FC02 LA16 LA18 5G435 AA01 AA03 BB12 BB15 BB16 EE27 FF03 FF08 GG24 HH02 KK07 LL07 LL08 LL09

Claims (11)

[Claims] 1. A layer of a base material having a convex shape such that a tip of a convex portion is directed in a direction opposite to an observer side, inside a light guide plate or on a light emitting surface from a light guide plate. Forming a gap in the transmission state, and providing a reflective layer on the inner surface of the convex portion and the outer surface of the convex portion, a part of light from inside the light guide plate directly passes,
Part of the remaining light is reflected one or more times by the reflection layer on the outer surface of the convex portion, reaches the observer through the gap in the transmission state formed between the layers, and is part of the light from the observer side. Is a light guide plate which is arranged so as to be reflected by a reflection layer on the inner surface of the convex portion and reach an observer. 2. The structure of the layer having a convex shape is at least one selected from the group consisting of a straight cone, an oblique cone, a pyramid, an oblique pyramid, a wedge shape and a convex polygon, and a structure having a partial shape thereof. The light guide plate according to claim 1, wherein 3. The vertical or oblique cone has an apex angle of 5 ° to 90 °.
The light guide plate according to claim 2, wherein 4. The light guide plate according to claim 2, wherein the apex angle of the pyramid, the oblique pyramid, the wedge shape or the convex polygon is 5 ° to 90 °. 5. The method according to claim 1, wherein the shape of the layer having a convex shape is at least one of a structure selected from a spherical surface, an elliptical surface, a paraboloid and a hyperboloid, and a structure having a partial shape thereof. Light guide plate. 6. At least one of the shapes of a layer having a convex shape
The light guide plate according to claim 1, wherein the at least one bottom surface is a light reflection layer. 7. At least one of the shapes of a layer having a convex shape
The light guide plate according to claim 1, wherein the at least one bottom surface is a layer having both a light reflection layer and a light transmission layer. 8. The light guide plate according to claim 1, wherein the base material is a transparent or translucent resin or a transparent glass plate. 9. The light guide plate according to claim 8, wherein the transparent or translucent resin is selected from at least one of an acrylic resin, a styrene resin, a polyester resin and a polycarbonate resin. 10. A liquid crystal backlight unit using the light guide plate according to claim 1. 11. A light guide plate according to claim 1 or claim 1 or claim 1.
0. A liquid crystal display device using the liquid crystal backlight unit according to 0.