JP2001154005A - Light-diffusing plate with high relative refractive index difference and guide device for illumination - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-diffusing plate having high relative refractive index difference in a simple structure which shows high illumination efficiency for a screen and enables uniform diffusion of light, and to provide a guide device for illumination. SOLUTION: A large number of sol fixed parts 3, having metal oxides in a desired pattern, are distributed with specified pitches in a polysilane film 2 on a light guide plate 1. When the light from a light source enters the light guide plate 1 and transmits the light guide plate 1, the light is diffused by the sol fixed parts 3. Thus, the whole screen to be illuminated can be illuminated brightly and uniformly by the light-diffusing plate having a simple structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high relative refractive index difference type light diffusion plate and a light illumination guide device.

[0002]

2. Description of the Related Art In recent years, liquid crystal display devices have been frequently used in personal computers, portable telephones, portable information terminals, car navigation devices and the like. Also, a plasma display device is being put to practical use as a large-screen display device. In such a display device, a light diffusing plate is provided between the light source and the light guide plate for uniformly and brightly illuminating the screen with light from one or two light sources for screen illumination.

FIG. 11 is a schematic view of a conventional light diffusing plate.

As the light diffusing plate, a glass plate (or plastic plate) 10 having good light transmittance and having irregularities on the order of microns on the surface is used.

[0005] When incident light enters from the back surface of such a light diffusion plate, the incident light is radiated to the surroundings as diffused light in a wide angle region on the uneven surface 11.

[0006]

However, the above-mentioned conventional light diffusing plate has the following problems.

(1) In FIG. 11, the light diffused on the uneven surface 11 is reflected by the back surface direction 14, the side surface directions 15-1 and 15-2 and the oblique direction 16-
1, 16-2. Therefore, the amount of light in the direction of arrow 13 decreases, and the screen irradiation efficiency of the display device described above is low. For this reason, at present, the light power of the light source is increased and used, and the power consumption is large.

(2) An etching process is used to form the uneven surface of the light diffusion plate, but the process is complicated and expensive equipment and cost are required.

(3) Since the uneven surface is formed by using the etching technique, it is not suitable for a large size, and discontinuous bright spots are easily generated, and it is difficult to improve the yield.

Accordingly, an object of the present invention is to solve the above-mentioned problems, to provide a high-refractive-index-difference-type light diffusion plate and a light-illumination guide device which have high screen irradiation efficiency, can perform uniform light diffusion, and have a simple structure. Is to provide.

[0011]

In order to achieve the above object, a high relative refractive index difference type light diffusion plate of the present invention is formed on a light guide plate which transmits light and on one main surface of the light guide plate. And a sol-fixed portion having a large number of metal oxides distributed at predetermined intervals in the polysilane film.

In addition to the above structure, the high relative refractive index difference type light diffusion plate of the present invention may have at least two layers of a polysilane film in which a sol fixing portion is distributed on a light guide plate.

In addition to the above configuration, the polysilane film in which the sol-fixed portions of the high relative refractive index difference type light diffusion plate of the present invention are distributed is preferably laminated so that the sol-fixed portions do not overlap in the laminating direction.

In addition to the above structure, the high relative refractive index difference type light diffusion plate of the present invention absorbs ultraviolet light on the polysilane film, on the other main surface of the light guide plate, or on both main surfaces of the light guide plate. An ultraviolet absorbing layer that reflects ultraviolet light or an ultraviolet reflecting layer that reflects ultraviolet light may be formed.

In addition to the above structure, in the high relative refractive index difference type light diffusion plate of the present invention, the sol fixing portion may include a fluorescent material or a luminous material.

In addition to the above-mentioned structure, the high relative refractive index difference type light diffusion plate of the present invention may be formed of a polysilane film, an ultraviolet absorbing layer formed on the polysilane film, or an ultraviolet reflecting layer formed on the polysilane film. Irregularities may be formed on the surface.

In addition to the above structure, it is preferable that the sol fixing portion of the high relative refractive index difference type light diffusion plate of the present invention is formed to a desired depth in the thickness direction from the surface of the polysilane film.

According to the present invention, there is provided a light illumination guide device comprising: a light guide plate which transmits light; a polysilane film formed on one main surface of the light guide plate; A sol fixing portion having a metal oxide of, a light source for illumination arranged on one side or both sides of the light guide plate, and a light reflection plate arranged on the other main surface of the light guide plate. It is provided with.

The light illuminating guide device of the present invention comprises a light guide plate which transmits light, a polysilane film formed on one main surface of the light guide plate, and a plurality of light guide plates distributed at a predetermined interval in the polysilane film. A sol-fixed portion having a metal oxide, another polysilane film formed on the other main surface of the light guide plate, and a plurality of metal oxides distributed at predetermined intervals in the other polysilane film. And a light source for illumination arranged on one side or both sides of the light guide plate, and a light reflection plate provided on another polysilane film.

The light illuminating guide device of the present invention comprises a light guide plate that transmits light, a polysilane film formed on one main surface of the light guide plate, and a plurality of light guide plates distributed at predetermined intervals in the polysilane film. A sol-fixed portion having a metal oxide, another polysilane film formed on the other main surface of the light guide plate, and a plurality of metal oxides distributed at predetermined intervals in the other polysilane film. A light source for illumination is disposed on the sol-fixed portion of the above and on the other polysilane film side.

In addition to the above configuration, the light illumination guide device of the present invention may have a light reflector disposed behind the light source.

In addition to the above configuration, the light illumination guide device of the present invention may be provided with a light guide plate for guiding light from the light guide plate on one main surface side of the light guide plate.

In addition to the above configuration, in the light illumination guide device of the present invention, it is preferable that the sol fixing portion having the metal oxide is formed at a desired depth in the thickness direction from the surface of the polysilane film.

According to the present invention, since a large number of sol-fixed portions of a desired pattern having a metal oxide in a polysilane film on a light guide plate are distributed at predetermined intervals, light from a light source can be transmitted to the light guide plate. Incident on the sol, the light transmitted through the light guide plate is diffused at the sol fixing portion. Therefore, the entire screen illuminated by the light diffusion plate can be illuminated uniformly and brightly with a simple configuration.

When two or more polysilane films of the light guide plate are laminated, when an ultraviolet absorbing layer or an ultraviolet reflecting layer is formed, a fluorescent material or a luminous material is contained in the sol fixing portion. If the surface is uneven on the surface of the polysilane film, the ultraviolet absorbing layer formed on the polysilane film, or the ultraviolet reflecting layer formed on the polysilane film, the screen irradiation efficiency becomes higher. , Uniform light diffusion can be performed.

[0026]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1A is a front view showing an embodiment of the high relative refractive index difference type light diffusion plate of the present invention, and FIG.
FIG. 3A is a sectional view taken along line AA of FIG.

A polysilane film 2 is formed on one main surface (an upper surface in FIG. 1B, hereinafter referred to as “front surface”) of the light guide plate 1 that transmits light. Polysilane film 2
Are exposed to ultraviolet light in a number of desired patterns at predetermined intervals S, and a sol-fixed portion having a metal oxide in the ultraviolet-ray exposed portion (in the figure, a columnar shape, a diameter D, an exposed area M) 3 Are formed. Light for illumination (light having a wavelength of 420 nm or more, for example, light of a white light emitting diode is preferable. The light guide plate 1 is obtained by applying a yttrium / aluminum / garnet phosphor on the surface of a blue light emitting diode chip. A material that efficiently transmits white light-emitting diodes), such as glass, plastic, sapphire, and transparent ceramics, is used.

Next, a method for manufacturing the polysilane film 2 on the surface of the light guide plate 1 and the sol fixing portion 3 having a metal oxide will be described.

(1) Polysilane is applied on the surface of the light guide plate 1 to form a polysilane film 2.

(2) A photomask (not shown) in which a desired pattern is drawn is placed on the polysilane film 2, and ultraviolet light (wavelength: 250 nm to 35 nm) is placed on the photomask.
(0 nm).

(3) The light guide plate 1 on which the polysilane film 2 is formed is immersed in an aqueous sol solution containing metal oxide fine particles.

(4) The light guide plate 1 is taken out from the aqueous sol solution and washed with water.

(5) The light guide plate 1 is heated and dried (about 12
0 ° C).

(6) The dried light guide plate 1 is baked (about 250 ° C. to 300 ° C.) to form the polysilane film 2 and the sol fixing portion 3 having a metal oxide.

Here, the polysilane used is represented by Formula 1.

[0037]

Embedded image

Wherein R ¹ , R ² , R ³ and R
⁴ is each independently hydrogen, a substituted or unsubstituted aliphatic hydrocarbon group, a group selected from the group consisting of a substituted or unsubstituted alicyclic hydrocarbon group and an alkoxyl group, m and n are Represents an integer of 0 or more, and m + n is an integer of 1 or more.

A chain polysilane represented by the formula (1) or Si having 3 or 4 bonds to adjacent Si atoms
It is a network-like polysilane containing atoms. These compounds may be used alone dissolved in an organic solvent,
Photo-radical generators and oxidizers described in JP-A-7-114188 for improving photosensitivity and
The silicone compound described in JP-A-262728 may be appropriately blended and used. In addition, when irradiating ultraviolet rays through a photomask, the method described in JP-A-11-65124 is disclosed in Japanese Patent Application Laid-Open No. H11-65124 so that oxygen necessary for converting a Si-Si bond, which is a main chain of polysilane, into silanol is sufficiently supplied. A method in which a gap is provided between the photomask and the surface of the polysilane and irradiation is performed may be employed.

Here, the metal oxide sol solution used is:
It is obtained by forming a solution of a metal alkoxide, acetylacetonate, acetate or the like in a solvent such as an alcohol and subjecting it to a condensation polymerization reaction using a catalyst such as an acid or a base.

In the present invention, since the metal oxide sol solution is desirably colorless, Si, Zr, Ti, G
A metal oxide sol such as e or Al is most suitable. These elements may be used alone or may be used after preparing a sol in which two or more metal oxides are present. further,
Fine particles for controlling the refractive index containing B or P (the particle size is several hundred nm or less) or a cationic water-soluble composition may be added to the above-mentioned sol. As an example, when polymethylphenylsilane is used as the polysilane and alumina sol is used for the sol-fixed portion having the metal oxide, the refractive index of about 1.74 can be realized, and the refractive index of the polysilane film 2 is about 1.74. .
Thus, a high relative refractive index difference type light diffusion plate having a relative refractive index difference Δ of about 7% as compared with that of No. 62 was obtained. This relative refractive index difference Δ can be adjusted in the range of 1% to 10% by the amount of alumina added.

Here, the sol fixing portion 3 having a metal oxide
Is preferably in the range of several μmφ to tens of μmφ, and the interval S between the sol fixing portions 3 is preferably in the range of 1 μm to tens of μm. The pattern shape of the sol fixing portion 3 may be a circle, an ellipse, a polygon, a star, a triangle, a mesh, or the like, as described later.

FIG. 2A is a front view showing another embodiment of the high relative refractive index difference type light diffusion plate of the present invention, and FIG.
It is a BB sectional view taken on the line of (a).

The difference from the embodiment shown in FIG. 1 is that the sol fixing portion 3 having a metal oxide on the surface of the light guide plate 1 is provided.
2-1 (2-2) containing poly-1 (3-2)
Is formed in two layers.

The sol fixing portions 3-1 and 3- having a metal oxide in the laminating direction of the laminated polysilane films 2-1 and 2-2.
2 are configured not to overlap. With this two-layer structure, the illumination light that has propagated inside the light guide plate 1 is more uniformly diffused, and the polysilane film 2-1 (2
2) is radiated as diffused light 13 to the front (upward in FIG. 2B). Further, by increasing the number of layers to three layers, four layers,..., More uniform diffused light can be obtained.

FIG. 3A is a side sectional view showing another embodiment of the high relative refractive index difference type light diffusion plate of the present invention, and FIG. 3B is a sectional view taken along line CC of FIG. 3A. FIG.

The difference from the embodiment shown in FIGS. 1A and 1B is that the surface of the polysilane film 2 has ultraviolet rays (UV).
This is the point that an ultraviolet absorbing layer (or ultraviolet reflecting layer) 4 that absorbs (or reflects) the above light is formed.

By forming the ultraviolet absorbing layer 4 on the polysilane film 2, the polysilane film 2 and the sol fixing portion 3 containing the metal oxide can be used even if ultraviolet light is applied for a long time to the use of the light diffusion plate. Characteristic degradation can be suppressed.

The ultraviolet absorbing layer 4 is made of, for example, ZnO
₂ (or Ta ₂ O ₅₎ and several tens of layers alternately and SiO ₂ at a temperature of about 100 ° C., benzophenone in multiple layers or polymer material deposited on the multilayered, adding salicylate, benzotriazole additives Or a material obtained by adding a metal oxide pigment such as titanium dioxide, iron oxide, or zinc oxide to a polymer material.

As the thickness of the ultraviolet absorbing layer 4 increases, the effect of reflecting (or absorbing) ultraviolet light can be enhanced. Its film thickness is 0. It is preferable to select from several μm to several tens μm. In the figure, S ₁ indicates the diameter of the sol fixing portion 3,
S ₂ indicates the distance between the sol fixing portions 3. Sol fixing part 3
Is M.

FIG. 4A is a front view showing another embodiment of the high relative refractive index difference type light diffusion plate of the present invention, and FIG.
It is DD sectional drawing of (a).

The difference from the embodiment shown in FIGS. 1A and 1B is that the positions of the polysilane film 2 and the sol fixing portion having the metal oxide are reversed.

In this high relative refractive index difference type light diffusion plate, a columnar portion is a polysilane film 2a which is not irradiated with ultraviolet rays.
a is a portion in which a sol having a metal oxide is impregnated into a polysilane film irradiated with ultraviolet rays.

Even when such a high relative refractive index difference type light diffusion plate is used for a light illumination guide device, high uniformity can be obtained.

FIG. 5 (a) is a side sectional view showing another embodiment of the high relative refractive index difference type light diffusion plate of the present invention, and FIG. 5 (b) is a sectional view taken along line EE of FIG. 5 (a). FIG.

The difference from the embodiment shown in FIGS. 1A and 1B is that the polysilane film on which the sol-fixed portion having the metal oxide is formed has two layers, and the surface has an ultraviolet absorbing layer ( (Ultraviolet reflective layer) 4.

Even when such a high relative refractive index difference type light diffusion plate is used for a light illumination guide device, high uniformity can be obtained.

FIG. 6 is a sectional view showing another embodiment of the high relative refractive index difference type light diffusion plate of the present invention.

The difference from the embodiment shown in FIGS. 1A and 1B is that a polysilane film including a sol fixing portion having two layers of metal oxide is laminated on the surface of the light guide plate 1. The point that an ultraviolet absorbing layer (ultraviolet reflecting layer) 4a having irregularities on the surface is formed on the polysilane film and the other main surface of the light guide plate 1 (the lower side in FIG. )) Also in that a polysilane film 2-3 including a sol fixing portion 3-3 having a metal oxide is formed thereon, and a light reflecting plate 6 is provided on the polysilane film 2-3. is there.

The high relative refractive index difference type light diffusing plate allows light for illumination to enter from both sides 15-1 and 15-2 of the light guide plate 1 and efficiently and uniformly diffuses light in the direction of arrow 13. It is designed to extract light.

Here, FIGS. 7A to 7D correspond to FIG.
(A), (b) to FIG. 5 (a), the shape of the sol-fixed portion having the metal oxide used for the high relative index difference type light diffusion plate shown in FIGS. Things.

The sol fixing portion or the polysilane film may be circular, star-shaped, triangular, square, elliptical, polygonal, or mesh. The area of this shape is preferably selected from the range of 10 μm ² to several tens μm ² .

FIG. 8 is a conceptual diagram showing one embodiment of the light illumination guide device of the present invention.

In this light illumination guide device, light sources 5-1 and 5-2 are arranged on both side surfaces of the light guide plate 1 of the light diffusion plate, and the light guide plate 7 is provided in front of the light diffusion plate (upper side in the figure). It is arranged.

Light for illumination from the light sources 5-1 and 5-2 propagates in the light guide plate 1, is reflected by the light reflection plate 6, and includes a polysilane film including a sol fixing portion 3-1 containing a metal oxide. 2-
1 is diffused, enters the polysilane film 2-2 including the sol-fixed portion 3-2 having a metal oxide, is diffused again, and is further diffused therein.
3 enters the polysilane film 2-3 and is uniformly diffused over a wider area. The diffused light propagates substantially uniformly in the light guide plate 7.

FIG. 9 is a conceptual diagram showing another embodiment of the light illumination guide device of the present invention.

The difference from the embodiment shown in FIG. 8 is that a light diffusing portion and a light reflecting plate 6 are also provided on the back surface of the light guide plate as a light diffusing plate, and the back surface side diffuses and reflects light more efficiently. The point is to make it happen.

Light is evenly applied to such a light illumination guide device.

FIG. 10 is a conceptual view showing another embodiment of the light illumination guide device of the present invention.

The difference from the embodiment shown in FIG. 8 is that a light source 5 for illumination is arranged on the back side of the light diffusing plate,
(A backlight type) in which the light reflecting plate 6 is disposed behind (in the figure, lower side).

Light is evenly emitted in such a light illumination guide device.

The present invention is not limited to the above embodiment.
First, a fluorescent material is applied to the sol fixing portion 3 having a metal oxide,
Alternatively, a luminous material may be included. For example, Al
Er (NO ₃ ) ₃ .5 is added to the aqueous sol solution of (OC ₃ H ₇ ) _3.
Using a solution of H ₂ O, a light guide plate with a polysilane film irradiated with ultraviolet rays is immersed in this aqueous solution. As a fluorescent material, besides erbium Er, holmium H
o, Samarium Sm, Neodymium Nd, Praseodymium P
R, rare earth elements such as dysprosium Dy and thulium Tm can be used.

The unevenness 11 of the high relative refractive index difference type light diffusion plate shown in FIG. 6 has a transparent protective layer on the ultraviolet absorbing layer (ultraviolet reflecting layer) 4 in addition to the surface of the ultraviolet absorbing layer (ultraviolet reflecting layer) 4. A layer (for example, a polymer layer or a glass layer) may be provided, and irregularities (including irregularities such as triangles and polygons) may be formed on the surface of the protective layer.

In the high relative refractive index difference type light diffusion plate shown in FIGS. 1 to 6 and the light illumination guide device shown in FIGS. 8 to 10, the sol fixing portion 3 having a metal oxide is formed of a polysilane film. A desired depth may be formed in the thickness direction from the surface. With such a configuration, the light incident on the polysilane film 2 through the light guide plate 1 is reflected and diffused at the bottom of the sol fixing portion, and can be diffused at a wider angle. The minimum value of the depth of the sol fixing portion may be about 程度 of the thickness of the polysilane film 2.

[0075]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the high relative refractive index difference type light diffusion plate of the present invention will be described below.

First, the synthesis of polysilane used for the high relative refractive index difference type light diffusion plate was performed as follows.

A 1000 ml flask equipped with a stirrer was charged with 400 ml of toluene and 13.3 g of sodium. The contents of the flask were heated to 111 ° C. in a yellow room in which ultraviolet rays were shielded, and stirred at a high speed to disperse sodium finely in toluene. Here, 51.6 g of phenylmethyldichlorosilane was added, and 3
Polymerization was performed by stirring for hours. Thereafter, excess sodium was quenched by adding ethanol to the resulting reaction mixture. After washing with water, the separated organic layer was poured into ethanol to precipitate polysilane. The resulting crude polysilane was converted from ethanol to 3
By performing reprecipitation twice, the weight average molecular weight is 23,000.
Was obtained.

Next, the adjustment of the alumina sol liquid used for the high relative refractive index difference type light diffusion plate was performed as follows.

Aluminum triisopropoxide 14
g and 66 g of ion-exchanged water were placed in a flask and heated to 80 ° C. 6 g of a stirred 10% aqueous nitric acid solution was added to the flask, and the mixture was stirred at 80 ° C. for 5 hours.
g was added to prepare an alumina sol solution.

Next, the process of the high relative refractive index difference type light diffusion plate will be described.

A 10% toluene solution of polysilane was applied to a glass plate using a spin coater so that the dry film thickness was 2.5 μm. A photomask made of quartz is arranged on the polysilane thin film of the obtained laminate, and an ultrahigh-pressure mercury lamp parallel exposure device (CL-50 manufactured by Nihon Battery Co., Ltd.)
-200 A) was used to irradiate ultraviolet rays with a light amount of 4 J / cm ² . After removing the photomask, the laminate on which the latent image was formed was immersed in the alumina sol liquid prepared as described above for 5 minutes. Then take out from the sol, wash with water
After drying at 20 ° C. for 10 minutes, the resultant was heated at 300 ° C. for 2 hours to obtain a light diffusing plate having a high relative refractive index difference Δ.

As described above, the high relative refractive index difference type light diffusion plate and the light illumination guide device of the present invention have the following effects.

(1) Light for illumination incident from the light guide plate side of the light diffusion plate can be diffused uniformly and efficiently in front of the light diffusion plate.

(2) Since light diffusion is caused by a large number of refractive index modulated films having a high refractive index in the polysilane film formed on the surface of the light guide plate,
There is little reflected return light to the incident side and light diffusion to the side direction,
Light can be more uniformly diffused in front of the polysilane film. In other words, the entire screen to be illuminated can be illuminated brighter and more uniformly by transmitting the light for illumination with lower loss.

(3) By laminating a polysilane film having a modulated refractive index in a multilayer shape on the surface of the light guide plate, light can be diffused more uniformly.

(4) The refractive index of the sol-fixed portion having the metal oxide containing the refractive index control additive can be changed over a wide range by adjusting the refractive index control additive and the concentration thereof. The relative refractive index difference Δ is 1% or more,
It can be changed to about 0%. By forming the refractive index modulation type polysilane film having a high relative refractive index difference Δ in this manner, light can be diffused more uniformly.

(5) In the sol fixing portion having the metal oxide,
Since a fluorescent material, a phosphorescent material, a pigment, and the like can be added, a screen such as a liquid crystal can be further brightened or a colorful screen can be obtained.

(6) Since it can be manufactured with simple equipment and a large-sized light diffusion plate can be manufactured, cost reduction can be expected.

(7) It is possible to provide a light illumination guide device capable of brightly illuminating a screen of a liquid crystal display device or the like, and to reduce the cost of the device.

[0090]

In summary, according to the present invention, the following excellent effects are exhibited.

It is possible to provide a high-refractive-index-difference-type light diffusion plate and a light-illumination guide device which have high screen irradiation efficiency, can perform uniform light diffusion, and have a simple structure.

[Brief description of the drawings]

FIG. 1A is a front view showing an embodiment of a high relative refractive index difference type light diffusion plate of the present invention, and FIG. 1B is a cross-sectional view taken along line AA of FIG.

2A is a front view showing another embodiment of the high relative refractive index difference type light diffusion plate of the present invention, and FIG. 2B is a sectional view taken along line BB of FIG.

FIG. 3A is a side sectional view showing another embodiment of the high relative refractive index difference type light diffusion plate of the present invention, and FIG.
It is a C line sectional view.

FIG. 4A is a front view showing another embodiment of the high relative refractive index difference type light diffusion plate of the present invention, and FIG. 4B is a sectional view taken along line DD of FIG.

FIG. 5A is a side sectional view showing another embodiment of the high relative refractive index difference type light diffusion plate of the present invention, and FIG.
It is E sectional drawing.

FIG. 6 is a sectional view showing another embodiment of the high relative refractive index difference type light diffusion plate of the present invention.

7 (a) to (d) are FIGS. 1 (a), (b) to 5
(A), (b) a sol-fixed portion having a metal oxide used in the high relative refractive index difference type light diffusion plate, or a shape of a polysilane film.

FIG. 8 is a conceptual diagram showing an embodiment of the light illumination guide device of the present invention.

FIG. 9 is a conceptual diagram showing another embodiment of the light illumination guide device of the present invention.

FIG. 10 is a conceptual diagram showing another embodiment of the light illumination guide device of the present invention.

FIG. 11 is a schematic view of a conventional light diffusion plate.

[Explanation of symbols]

 Reference Signs List 1 light guide plate 2 polysilane film 3 sol fixing part

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Iwao Sumiyoshi 19-17 Ikedanakacho, Neyagawa-shi, Osaka Inside Nippon Paint Co., Ltd. (72) Inventor Hiroshi Tsushima 19-17 Ikedananakacho, Neyagawa-shi, Osaka Nippon Paint F term (reference) in the company 2H038 AA55 BA06 2H042 BA04 BA12 BA20 5G435 AA02 AA03 EE26 EE27 FF03 FF06 FF08 GG16 GG23 GG24 KK07

Claims (13)

[Claims] 1. A light guide plate for transmitting light, a polysilane film formed on one main surface of the light guide plate, and a plurality of metal oxides distributed at predetermined intervals in the polysilane film. A light diffusing plate having a high relative refractive index difference, comprising a sol fixing portion. 2. The high relative refractive index difference type light diffusion plate according to claim 1, wherein at least two polysilane films in which the sol fixing portions are distributed are laminated on the light guide plate. 3. The high relative refractive index difference type light diffusion plate according to claim 2, wherein the polysilane film in which the sol-fixed portions are distributed is stacked so that the sol-fixed portions do not overlap in the stacking direction. 4. An ultraviolet-absorbing layer that absorbs ultraviolet light, or an ultraviolet-reflection layer that reflects ultraviolet light, on the polysilane film, on the other main surface of the light guide plate, or on both main surfaces of the light guide plate. 4. The method according to claim 1, wherein a layer is formed.
The light diffusing plate with high relative refractive index difference according to any one of the above. 5. The high relative refractive index difference type light diffusion plate according to claim 1, wherein the sol fixing portion contains a fluorescent material or a luminous material. 6. An unevenness is formed on the surface of the polysilane film, the ultraviolet absorbing layer formed on the polysilane film, or the surface of the ultraviolet reflective layer formed on the polysilane film. The light diffusing plate with high relative refractive index difference according to any one of the above. 7. The sol fixing portion is formed to a desired depth in a thickness direction from a surface of the polysilane film.
7. The high relative refractive index difference type light diffusion plate according to any one of items 1 to 6. 8. A light guide plate transmitting light, a polysilane film formed on one main surface of the light guide plate, and a plurality of metal oxides distributed at predetermined intervals in the polysilane film. A sol fixing portion, a light source for illumination arranged on one side or both sides of the light guide plate, and a light reflection plate arranged on the other main surface of the light guide plate. A light illumination guide device characterized by the above-mentioned. 9. A light guide plate for transmitting light, a polysilane film formed on one main surface of the light guide plate, and a plurality of metal oxides distributed at predetermined intervals in the polysilane film. A sol fixing portion, another polysilane film formed on the other main surface of the light guide plate, and another sol fixing portion distributed at a predetermined interval in the other polysilane film and having a large number of metal oxides. And a light source for illumination arranged on one side or both sides of the light guide plate, and a light reflector provided on the other polysilane film, for light illumination. Guide device. 10. A light guide plate that transmits light, a polysilane film formed on one main surface of the light guide plate, and a plurality of metal oxides distributed at predetermined intervals in the polysilane film. A sol fixing portion, another polysilane film formed on the other main surface of the light guide plate, and another sol fixing portion distributed at a predetermined interval in the other polysilane film and having a large number of metal oxides. A light source for illumination is arranged on the other polysilane film side. 11. The light illumination guide device according to claim 10, wherein a light reflection plate is disposed behind the light source. 12. The light illumination guide device according to claim 8, wherein a light guide plate through which light from the light guide plate is guided is provided on one main surface side of the light guide plate. 13. The light illumination guide device according to claim 8, wherein the sol-fixed portion having the metal oxide is formed to a desired depth in a thickness direction from a surface of the polysilane film.