JP2002258020A - Reflecting sheet and reflecting film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reflecting sheet having high heat resistance, excellent in heat releasing property and ensuring low peelability or scrapability of a reflective coating material layer. SOLUTION: The reflecting sheet is obtained by laminating a reflective coating material containing a white pigment and a binder resin on a base and the binder resin contains a silicone resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a reflection sheet and a reflection film, and more particularly to a reflection sheet and a reflection film for a backlight device for a liquid crystal display.

[0002]

2. Description of the Related Art A reflection sheet is conventionally used as a reflector and a back reflector used in a backlight device for a liquid crystal display, a reflector used in a printer and a facsimile device, a strobe reflector, and the like. In particular, in recent years, there has been a demand for a reflective sheet for a backlight device for a liquid crystal display that provides high reflectance. An edge-type backlight device for a liquid crystal display generally has a straight tube lamp (for example, a cold cathode tube) arranged along the edge of the light guide plate. Part of the light emitted from the lamp is directly guided to the light guide plate, while the remaining light is reflected by a reflection sheet (ie, a reflector) arranged so as to partially surround the lamp and enters the light guide plate. . The light introduced into the light guide plate is reflected by a light diffusion element printed on the back surface of the light guide plate in a halftone dot form, and exits from the surface (illumination surface) of the light guide plate. on the other hand,
Light passing through the back of the light guide plate passing between the light diffusing elements arranged in a halftone dot shape is reflected by the reflection sheet (that is, the reflection plate) arranged on the back side of the light guide plate, and is reflected from the light guide plate. The light is directed toward the liquid crystal cell through the illuminating surface.

At present, as a reflection sheet for a light source of a backlight device for a liquid crystal display, a reflection sheet made of a silver-deposited polymer film and a reflection sheet made of a white film are generally used.

[0004] Reflection sheets made of silver-deposited polymer films are disclosed, for example, in JP-A-2000-180615, JP-A-6-47870 and JP-A-6-157.
It is disclosed in many patent documents such as Japanese Patent No. 75. However, in such a reflection sheet, since silver as a conductor is close to the light source, high frequency current leaks from the lamp of the backlight device, current consumption increases, and lighting failure occurs. Further, since the reflector is a metal film, the light diffusivity is low, so that there is a problem that a bright line is easily generated on the display. Furthermore, silver-deposited films have the disadvantage of being expensive.

A reflection sheet made of a white film is disclosed in, for example, JP-A-7-222337 and Japanese Patent No. 28487.
No. 13 and JP-A-2000-66012. JP-A-7-222337 discloses a reflective sheet in which a reflective coating obtained by mixing hollow particles such as a styrene resin in a resin binder composed of a (meth) acrylate copolymer is laminated on the surface of a film-like support. Is disclosed. In such a reflective sheet, initially,
High reflectivity can be provided. However, since the styrene resin or the like is contained as hollow particles, when used in a high-temperature environment for a long time, the reflective sheet yellows, which causes a problem that the reflectance is reduced. Furthermore, since such a reflection sheet has inferior heat radiation characteristics, the temperature of the cold-cathode tube becomes high, the luminous efficiency is reduced, and the deterioration of the cathode tube is promoted.

Japanese Patent No. 2848713 discloses a reflection sheet using a reflection paint containing titanium white as an inorganic pigment as a reflection agent and an acrylic resin as a binder resin. Since an acrylic resin is used as the binder resin, there is a problem that heat resistance is insufficient.

Japanese Patent Application Laid-Open No. 2000-66012 discloses a reflection sheet containing an inorganic white pigment as a main component and a fluorine resin as a binder resin. But,
Generally, a fluorine-based resin may release hydrogen fluoride, which is a strong acid, in an environment such as a high temperature, and may cause corrosion.

In addition, some of the above-mentioned reflection sheets have a problem that the silver deposition layer or the reflection paint layer is scraped or peeled off when incorporated in a backlight device.

[0009]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a reflection sheet and a reflection film having high heat resistance, excellent heat dissipation characteristics, and low peeling or scraping properties of a reflection paint layer.

[0010]

According to the present invention, there is provided a reflection sheet in which a reflection paint containing a white pigment and a binder resin is laminated on a support, wherein the binder resin contains a silicone resin. , Are provided. Such a reflective sheet has high heat resistance, excellent heat dissipation properties, and low peeling or scraping properties of the reflective paint layer. The reflection sheet is a reflection sheet for reflecting light from a light source of a backlight device for a liquid crystal display, particularly,
(1) In a backlight device for an edge type liquid crystal display, it is particularly useful as a reflector arranged so as to partially surround a straight tubular lamp or (2) a reflecting plate arranged on the back side of a light guide plate. . Such a reflective sheet provides a high reflectivity, maintains its initial high reflectivity for a long period of time, keeps the luminous efficiency of the lamp good, and makes it possible to extend the life of the lamp. Also, when incorporating the reflection sheet into the backlight device,
No peeling or scraping problem occurs. Further, according to the present invention, there is provided a reflective film obtained from a reflective paint containing a white pigment and a binder resin, wherein the binder resin contains a silicone resin.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The reflection sheet of the present invention can be used particularly effectively as a reflection sheet for a backlight device for a liquid crystal display. Hereinafter, a backlight device will be described as an example. FIG. 1 shows an edge type backlight device 1 used for a liquid crystal display.
0 is shown. A straight tube lamp (for example, a cold cathode tube) 1 is a light guide plate 2 as a light source of the backlight device.
Are arranged along one side edge of. A part of the light emitted from the lamp 1 is directly guided to the light guide plate 2, while the remaining light is reflected by a reflector 3 arranged so as to partially surround the lamp 1 and enters the light guide plate 2. The light introduced into the light guide plate 2 is reflected by a light diffusing element (not shown in the drawing) printed in a halftone dot pattern on the back side of the light guide plate 2 and the surface (illumination surface) of the light guide plate 2 Get out of 4. On the other hand, light passing between the light diffusing elements arranged in a halftone dot and passing through the back surface of the light guide plate 2 is reflected by the reflection plate 5 arranged on the back side of the light guide plate 2, and from the light guide plate 2. The light is directed toward the liquid crystal cell 8 through the illumination surface 4. Light exiting from the illuminating surface 4 of the light guide plate 2 passes through the diffusion sheet 6 where the light is diffused to prevent unevenness in luminance on the liquid crystal cell 8. Next, the light that has passed through the diffusion sheet 6 is refracted by a brightness enhancement film (for example, a prism lens sheet) 7, and the light is incident on the cell 8 in the vertical direction, so that the brightness of the display is improved. ing. In FIG. 1, the reflector and the reflection plate are drawn as separate elements, but an integrated one of these can also be used. Also, the reflector may conveniently be incorporated into a metal holder for use. Further, the reflection film is not in the form of a reflection sheet laminated on a film support, but, for example, a housing for a backlight device for a reflection plate or a holder as a support for a reflector, and the reflection film is formed on the support. It can also be arranged directly.

The reflective coating used in the present invention contains a white pigment as a reflective agent and a silicone resin as a binder resin. As the white pigment, preferably an inorganic white pigment,
For example, titanium dioxide, barium sulfate, magnesium sulfate, magnesium carbonate, calcium carbonate, and the like can be used. Titanium dioxide is particularly preferred because it can give the reflective sheet a high reflectance. The content ratio of the white pigment to the binder resin affects the reflectance.
White pigment is 75% by volume of binder resin in solid content ratio
To the white pigment in an amount of 25% by volume or more. 2
If the amount is less than 5% by volume, the reflection sheet may not be able to obtain a sufficient reflectance. In order to obtain good reflectance, the white pigment is preferably a binder resin 60
The white pigment is blended in an amount of 40% by volume or more with respect to% by volume. On the other hand, if the amount of the white pigment is too large, the bonding property of the reflective paint layer becomes insufficient, and the reflective paint layer may be easily peeled or scraped. Therefore, the white pigment is usually blended in an amount of 70% by volume or less of the white pigment with respect to 30% by volume of the binder resin.

[0013] The binder resin includes a silicone resin.
As the silicone resin used in the present invention, silicone
Polymers, such as partially crosslinked silicone polymers
(That is, a silicone resin, a silicone resin in a narrow sense,
) And linear silicone polymers (ie, silicone
Rubber). Silicone resin contains methyl
There are silicone type and methylphenyl silicone type. Me
Chill silicone resin is CH_ThreeSiO_3/2, (CH_Three)_Two
SiO, SiO_Two, (CH_Three)_ThreeSiO_1/2Various units
It is a copolymer that can be combined. Methylphenylsi
The silicone resin is, in addition to the above methyl units, C₆
H_FiveSiO_3/2, (C₆H_Five)_TwoSiO, (CH _Three) (C
₆H_Five) Combination of SiO units. Silicon
Resin catalysts include zinc, tin, cobalt, and iron.
Which organic acid salt, triethanolamine, tetramethyla
Uses amine compounds such as ammonium hydroxide
Wear.

The silicone rubber includes a thermosetting silicone rubber and a liquid silicone rubber. The thermosetting silicone rubber is based on a linear polymer (base polymer) with about 10,000 R ₂ SiO units connected, fine powder silica as a reinforcing material, and an auxiliary agent for dispersing the silica (silane, low molecular siloxane). As an ingredient. The base polymer mainly has the following formula:

[0015]

Embedded image

Wherein X is a reactive functional group, for example a hydroxyl group in the condensation type and a vinyl group in the addition type, and n is usually from 1500 to 4000. There are (formula 1), methyl vinyl (formula 2), methylphenyl vinyl (formula 3) and methylfluoroalkyl (fluorosilicone) (formula 4). Curing of the thermosetting silicone rubber is mainly performed by an organic peroxide. As such a curing agent, benzoyl peroxide (BP
O), bis-2,4-dichlorobenzoyl peroxide (2,
4DCB), dicumyl peroxide (DCP), and 2,5-dimethyl-2,5-bis (tert-butylperoxy) hexane.

The liquid silicone rubber basically comprises a base polymer, a curing agent and a catalyst. The base polymer is a linear diorganosiloxane having a reactive functional group at the terminal as shown below.

[0018]

Embedded image (In the formula, R is mainly a methyl group, and may be a phenyl group, a vinyl group, or a trifluoropropyl group, if necessary. X is a reactive functional group, and is, for example, a hydroxyl group in a condensed form. , The addition type can be a vinyl group, and n is usually 100 to 1000).

As a curing agent for the liquid silicone rubber, silane or siloxane having three or more reactive functional groups in one molecule can be used. In detail, the following equation

[0020]

Embedded image (Wherein, R ′ is a methyl group or hydrogen, Y is a reactive functional group, m is usually about 10 to 1000, n is
Is 3 or more) silane-based curing agents and siloxane-based curing agents. As the catalyst, an organometallic compound, an amine compound, a platinum compound, or the like is used, but depending on the curing agent, it may not be necessary.

[0021] The silicone resin may contain additional additives to improve various properties. Examples of such additives include calcium oxide, zinc oxide, boron compounds, Teflon (registered trademark) powder, rare earth metal compounds, iron oxide, metal silicon, zinc compounds, phthalocyanine,
Examples include magnesium oxide, barium oxide, platinum compounds, titanium oxide, carbon black, azobisisobutyronitrile, fatty acids, fatty acid metal salts, and azodicarbonamide.

The mixing ratio of the silicone resin / curing agent / additive is not limited, but may be 50-100 / 0-1% by weight.
0/0 to 50. If the amount of the curing agent is too small, the composition will not be cured, and if it is too large, it may cause bleed-out, yellowing, and the like. If the amount of the additive is too large, the white pigment may not be sufficiently filled.

Further, the binder resin may include other binder resins which are compatible with the silicone resin or do not macroscopically phase-separate, as long as the effects of the present invention are not impaired. As such a resin, a silicone-modified resin, for example, a silicone-modified alkyd resin, a polyester resin, an epoxy resin, an acrylic resin,
Examples include urethane resins, alkyd resins not modified with silicone, polyester resins, acrylic resins, and urethane resins. However, a binder resin composed of only a silicone resin having excellent properties such as heat resistance and heat dissipation is particularly preferable.

The reflective paint containing the white pigment and the binder resin may contain additives as necessary. Such additives include dispersants, surfactants, antioxidants, UV absorbers, UV stabilizers, and the like.

FIG. 2 shows a reflective paint layer 21 and a support 22.
A cross-sectional view of the reflection sheet 20 of the present invention having the following is shown. The reflective sheet 20 is coated with a reflective paint layer 21 on a support 22 by a known coating method such as application by a reverse roll coater, a gravure coater, a bar coater, a die coater, or the like, spray coating, drying, and curing. It can be manufactured by doing. The thickness of the coating film after drying and curing is usually 10 to 100 μm.
If the thickness is less than 10 μm, a sufficient reflectance cannot be obtained. On the other hand, if the thickness exceeds 100 μm, problems in the application process such as cracks on the surface and reduction in the application speed may occur. Drying is usually performed at elevated temperature,
Preferably, the reaction is performed at a temperature of 90 ° C. or higher to a temperature lower than the melting point or softening point of the support. For example, when the support is a polyester film, drying and curing can be performed at a temperature of 120 ° C. for several minutes.

As the support on which the reflective paint is laminated, polyester, drawn polypropylene, nylon, polycarbonate, polysulfone, polyethersulfone, polyetheretherketone, polyphenylsulfide, polyarylate, polyethylenenaphthalate, polyesterether, polyvinyl chloride And the like, an acrylic film, a polymethyl terpene resin film, and the like. The above film may be subjected to metal deposition, printing, or the like, or may be a composite film of the above film and another film. Furthermore, a metal coil, a metal plate, and a metal foil can also be used as the support. Examples of these metals include aluminum, an aluminum alloy,
Copper alloys such as copper, phosphor bronze, brass, white bronze, stainless steel,
It is possible to use iron, iron alloy, nickel, nickel alloy titanium and the like. Further, it is also possible to apply the reflective paint directly to a plastic molded body without laminating it on a support. Examples of such a plastic molded body include polyester resins such as acrylonitrile-butadiene-styrene (ABS), polystyrene, polycarbonate, polyacrylonitrile, and polyethylene terephthalate, and acrylic resins such as polymethyl methacrylate.

When a reflective sheet including a reflective film laminated on a film support is used as a reflector, the reflective sheet is arranged so as to surround a lamp having a small diameter, so that the support is flexible. Preferably, there is. In order to obtain sufficient flexibility, a support having a thickness of about 75 μm or less is preferred. On the other hand, when used as a reflector, there is no such restriction, and the thickness of the support can be determined from the viewpoint of practicality such as handleability and cost.

The reflection sheet or the reflection film may be, if necessary,
A protective layer can be further provided on the reflective paint layer. This protective layer acts to improve the abrasion and peelability of the reflective paint layer. The protective layer is not particularly limited as long as it can adhere to the reflective paint layer and can improve the sharpness and the like of the reflective paint layer.

The reflection sheet or the reflection film of the present invention is particularly useful as a reflection sheet or a reflection film for reflecting light from a light source of a backlight device for a liquid crystal display. It can be used as any other reflecting sheet, such as a mirror, a strobe reflector, and the like.

Further, the reflective film of the present invention is usually formed by laminating a reflective paint on a support. However, in some cases, it can be formed as a free-standing film having no support.

[0031]

Example 1 A glass bottle was filled with 100 g of titanium dioxide (CR-90 manufactured by Ishihara Techno Co., Ltd.), 120 g of ethyl acetate, 1 g of a phosphate ester-based dispersant, and 80 g of glass beads having an outer diameter of 1.5 mm as white pigment powder. Then, the white pigment powder is dispersed in the fine particles by a paint shaker. Next, the glass beads were filtered with coarse gauze to obtain 200 g of a dispersion. This dispersion was used as a binder resin as an addition reaction type silicone adhesive (SD4570, manufactured by Dow Corning Toray Silicone Co., Ltd.) 35.9
g and a catalyst (SRX212, manufactured by Dow Corning Toray Silicone Co., Ltd.) were added, and the mixture was stirred for 15 minutes. The reflective paint obtained in this manner was applied to a white polyester film (W400-38 μm, manufactured by Mitsubishi Chemical Polyester Film Co., Ltd.) as a support so that the thickness after drying was 25 μm, and 120 ° C. And cured for 2 minutes. The obtained reflective coating layer had a solid content ratio of 50% by volume of white pigment / 50% by volume of binder resin. Further, as a protective layer on the reflective paint layer, a silicone release agent (Dow Corning Toray Co., Ltd.) was used for 100 parts by weight of an aqueous emulsion of acrylic ester copolymer (Movinyl 8020 manufactured by Clariant Polymer Co., Ltd.). Silicone Co., Ltd.
Co., Ltd., 1 part by weight of SM7025) was applied by a bar coater and dried at 120 ° C. for 2 minutes to form a film having a thickness of 10 μm, thereby completing a reflection sheet.

Example 2 A condensation reaction type silicone pressure-sensitive adhesive (SH4280 manufactured by Dow Corning Toray Silicone Co., Ltd.) was used as a binder resin.
And peroxide curing agent (NIPPER BM manufactured by NOF Corporation)
A reflection sheet was formed in the same manner as in Example 1 except that TK-40) was used.

Example 3 Silicone rubber (CY038-51 manufactured by Dow Corning Toray Silicone Co., Ltd.) and catalyst (CY038-51 catalyst manufactured by Dow Corning Toray Silicone Co., Ltd.) were used as binder resins. Except for this, a reflection sheet was formed in the same manner as in Example 1.

Example 4 A reflection sheet was formed in the same manner as in Example 1 except that the mixing ratio of white pigment powder / binder resin was 30% by volume / 70% by volume.

Example 5 A reflection sheet was formed in the same manner as in Example 1 except that the mixing ratio of white pigment powder / binder resin was 63% by volume / 37% by volume.

Comparative Example A Reflective sheet using an acrylic resin as a binder resin (Sumitomo 3M Ltd., product number # 4596W)
Was used as a reflection sheet of this comparative example.

Comparative Example B The binder resin was UMB-200 which is an acrylic / urethane resin.
Reflective sheet was formed in the same manner as in Example 1 except that 100 parts by weight of 5B (acrylic polyol) / 63 parts by weight of TPA-100 (isocyanate curing agent) / 4 parts by weight of A-5 (catalyst) (manufactured by Soken Chemical Co., Ltd.) did.

Comparative Example C A reflective sheet was formed in the same manner as in Example 1 except that the binder resin was replaced with a fluorocarbon resin, THV-220P (manufactured by Sumitomo 3M Limited).

Test Items 1. Reflectance Using a U-4000 type automatic spectrophotometer (manufactured by Hitachi, Ltd.), barium sulfate was used as a standard plate, and the measurement wavelength range was 300 to 800.
The reflectance was measured in nm. The spectrum in this measurement range was calculated with visible light. 2. Aging test (heat resistance) The reflectance after aging the reflection sheet for a predetermined time in an environment of 130 ° C. was measured. 3.Temperature difference (heat dissipation characteristics) A reflective sheet is sandwiched between a semiconductor chip (CPU) and an aluminum plate, a constant pressure is applied to the reflective sheet, and then a 7.0V voltage is applied to the chip for heating. did. After a lapse of 5 minutes, the temperature difference between the chip and the aluminum was measured to evaluate the heat radiation characteristics. The lower the temperature difference, the better the heat dissipation characteristics of the reflection sheet. 4. Abrasion resistance The acrylic resin plate was pressed against the surface of the reflective sheet on the reflective paint layer side with a certain force, and the sensitivity was evaluated. The state where the surface was not damaged was recorded as ○, and the state where the surface layer was scratched and the powder fell was recorded as ×.

Table 1 and FIG. 3 show the results of the initial reflectance and the reflectance obtained by the aging test performed on the above Examples and Comparative Examples. Table 2 shows the results of the initial reflectance, temperature difference, and abrasion resistance test. Table 1 Example Aging temperature Reflectance (%) after predetermined aging time (%) (° C) 0 38 70 110 180 (hours) 1 130 96.35 96.33 96.14 96.05 95.97 A 130 96.64 92.83 91.53 90.03 87.41 B 130 94.91 94.81 94.51 93.79 92.75 C 130 96.45 94.33 93.57 92.81 92.20

Table 2 Examples Binder Pigment / Binder Initial temperature difference Scuff resistance (v / v) Reflectivity (%) (° C) 1 Addition-reaction type silicone adhesive 50/50 96.3 18 ○ 2 Condensation-reaction type silicone adhesive 50 / 50 97.2 ○ 3 Condensation reaction type silicone rubber 50/50 96.3 ○ 4 Addition reaction type silicone adhesive 30/70 94.5 ○ 5 Addition reaction type silicone adhesive 63/37 97.5 ○ A Acrylic styrene type 96.6 36 × Use hollow particles B Acrylic / urethane 50/50 94.1 ○ C Fluoropolymer 50/50 96.4 ○

From the results shown in Table 1, it can be seen that the reflectance of the reflective sheet of the present invention decreased by 0.38 even after aging at 130 ° C. for 180 hours.
%, Which could be kept almost constant. From the results shown in Table 1 and FIG. 3, it can be seen that the reflective sheet of the present invention has significantly higher heat resistance than the conventional reflective sheet, and maintains an initial high reflectance even after long-term use.

Looking at the initial reflectance of each example in Table 2 above,
It can be seen that the reflection sheet using the silicone resin as the binder resin of the present invention provides a reflectance equal to or higher than that of the conventional reflection sheet. Further, in the temperature difference test, the reflection sheet of the present invention shows a considerably lower temperature difference than the conventional reflection sheet, which means that the reflection sheet of the present invention has extremely excellent heat radiation characteristics. Due to the excellent heat dissipation characteristics, when the reflection sheet of the present invention is used as a reflection sheet for a backlight device of a liquid crystal display, particularly, as a reflector, light from a straight tube lamp (cold cathode tube) can be used efficiently. ,further,
The life of the lamp can be extended. Furthermore, according to the result of the example of the present invention, the chipping resistance is shown to be acceptable, and it is evaluated that there is no problem in workability when the light emitting element is incorporated into the backlight device.

[0044]

The reflection sheet of the present invention has high heat resistance,
It has excellent heat dissipation properties and the peeling or scraping of the reflective paint layer is low enough to be acceptable. Due to the high heat resistance, the initial high reflectance can be maintained for a long period of time. Due to the excellent heat dissipation, the light of the lamp (cold-cathode tube) of the backlight device for a liquid crystal display can be used efficiently, and the life of the lamp can be prolonged. Due to the low peeling or scraping property, there is no problem in workability at the time of assembling into a backlight device.

[Brief description of the drawings]

FIG. 1 is a perspective view of an edge type backlight device used for a liquid crystal display.

FIG. 2 shows a cross-sectional view of one embodiment of the reflection sheet of the present invention.

FIG. 3 is a graph showing reflectance versus aging time in an aging test of a reflection sheet.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 backlight device 1 tubular lamp 2 light guide plate 3 reflector 4 illuminating surface 5 reflector 6 diffusion sheet 7 brightness enhancement film 8 liquid crystal cell 20 reflection sheet 21 reflective paint layer 22 support body

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme court ゛ (Reference) // F21Y 103: 00 F21Y 103: 00 (72) Inventor Yasuhiro Koyama 3-8-8 Minamihashimoto, Sagamihara City, Kanagawa Prefecture Within Sumitomo 3M Limited (72) Inventor Takaaki Namba 3-8-8 Minamihashimoto, Sagamihara City, Kanagawa Prefecture F-term within Sumitomo 3M Limited (Reference) 2H042 DA01 DA10 DA11 DA16 DA21 DC04 DE00 2H091 FA14Z FA32Z FA41Z FB06 LA02 LA12

Claims (6)

[The claims] 1. A reflective sheet comprising a support and a reflective paint containing a white pigment and a binder resin laminated thereon, wherein the binder resin contains a silicone resin. 2. The reflection sheet according to claim 1, for reflecting light from a light source of a backlight device for a liquid crystal display. 3. The backlight device for a liquid crystal display according to claim 2, wherein the light source is an edge-type straight tubular lamp, and the reflecting sheet is a reflector disposed so as to partially surround the straight tubular lamp. Reflection sheet as described. 4. A light source of the backlight device for a liquid crystal display is an edge type straight tube lamp, and a light guide plate for illuminating light from the straight tube lamp to the entire surface of the liquid crystal cell is provided on the back side of the liquid crystal cell. And it is arranged adjacent to the straight tubular lamp, the reflection sheet is a reflection plate arranged on the opposite side of the liquid crystal cell with respect to the light guide plate,
The reflection sheet according to claim 2. 5. The reflective paint according to claim 1, wherein the white pigment is contained in an amount of 25% by volume or more with respect to 75% by volume of the binder resin in a solid content ratio. Reflection sheet as described. 6. A reflective film obtained from a reflective paint containing a white pigment and a binder resin, wherein the binder resin contains a silicone resin.