JPH10282338A - Semi-transmissive reflecting plate and liquid crystal display device using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To show color tones different between when using outside light and when using an inside light source by having a substrate containing light scattering titanium oxide coated mica powder for which the surface of mica is coated with a titanium oxide layer containing low-order titanium oxide. SOLUTION: Light scattering powder 48 is diffused in a transparent resin substrate 46, and the powder 48 has mica 49 coated with titanium oxide. The titanium oxide layer is obtained by reducing part of titanium dioxide 50 into low-order titanium oxide 52. When white light is injected therein, part of the light is reflected on the boundaries of resin-titanium oxide layer and of titanium oxide-mica. There is an optical path difference between the reflected lights 56, 58, depending on the layer thickness of the titanium oxide layer. As a result, interference occurs between both reflected lights 56, 58 to reinforce specified tone of light only. On the other hand, light from a light source has transmissive interference light 60 radiated directly to a liquid crystal panel in an additive complementary color relationship to a reflected interference light 62.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transflective reflector and a liquid crystal display using the same, and more particularly to an improvement in a light diffusing powder.

[0002]

2. Description of the Related Art In recent years, demand for liquid crystal display devices has been rapidly increasing in response to a demand for reduction in size and weight of various display devices. In particular, there is a further demand for notebook computers, portable televisions, and car navigation systems. Is expected. By the way, the liquid crystal panel used in this liquid crystal display device controls the transmission and blocking of light by controlling the arrangement of liquid crystal molecules in the panel, and basically does not emit light by itself. Is required.
As this light source, there are those using external light and those using a light source provided inside the device, but the former usually needs to provide a reflector on the back surface of the liquid crystal panel in order to collect external light from the display surface, The latter requires a diffusion plate to uniformly guide the light from the light source over the entire surface of the liquid crystal panel.

On the other hand, a liquid crystal display device that uses external light when the external light is abundant and uses an internal light source when the external light is insufficient has been developed. It has been evaluated as a liquid crystal display device that can ensure good visibility. Conventionally, such a light source switching type liquid crystal display device often employs a semi-transmissive reflection plate having both functions of the reflection plate or the diffusion plate. For example, Japanese Patent Application Laid-Open No. 8-179125 discloses an example of a semi-transmissive reflection plate used for a liquid crystal display device. In the same technology, a polarizing film provided with a layer containing a pearl pigment is shown.

[0004]

However, in a conventional general semi-transmissive reflection plate, regardless of the external light or the built-in light source, any of the light from the light source is diffusely reflected or diffused as it is. And try to
The design was not specifically considered. SUMMARY OF THE INVENTION The present invention has been made in view of the problems of the related art, and has as its object to provide a semi-transmissive reflector that exhibits different colors when using external light and when using an internal light source, and a liquid crystal display device using the same. It is in.

[0005]

According to the present invention, there is provided a semi-transmissive reflector according to the present invention, wherein a mica surface is coated with a titanium oxide layer containing low titanium oxide. The coated mica powder is contained in the substrate. Further, in the present invention, the mica surface of the titanium oxide-coated mica powder is preferably coated with titanium dioxide and low-order titanium oxide, or low-order titanium oxide. In the present invention, it is preferable that the mica surface of the mica powder coated with titanium oxide is coated with low-order titanium oxide or a titanium compound containing low-order titanium oxide, and the surface is further coated with titanium dioxide. is there.

In the present invention, it is preferable that the titanium oxide-coated mica powder is contained in the substrate in an amount of 1 to 70% by weight. Furthermore, the light source switching type liquid crystal display device according to the present invention includes a liquid crystal panel whose light transmission and non-transmission states can be controlled by an electric signal, an internal light source disposed on the back side of the liquid crystal panel, and the internal light source. And a transflective reflector disposed between the liquid crystal panels, wherein the transflective reflector is the transflective reflector described above.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a conceptual diagram of a liquid crystal display device according to one embodiment of the present invention. A liquid crystal display device 10 shown in FIG. 1 includes a liquid crystal panel 12 and a semi-transmissive reflection plate 14 disposed on the back side of the liquid crystal panel 12.
And an internal light source 16. When the internal light source 16 is used, the light from the light source 16 passes through the transflective reflector 14 and the polarizer 22 via the reflector 18 and the light guide plate 20, and is irradiated on the back surface of the liquid crystal panel 12.

Further, the light transmitted through the liquid crystal panel 12 is
The light passes through the polarizing plate 24 and exits from the LCD case 26.
On the other hand, when using external light, the case 26, the polarizing plate 2
4. The light transmitted through the liquid crystal panel 12 and the polarizing plate 22 is reflected by the semi-transmissive reflecting plate 14, and is emitted again through the polarizing plate 22, the liquid crystal panel 12 and the polarizing plate 24, and can be observed from the outside. Here, the liquid crystal panel 12 includes the outermost glass substrates 30 and 32 and the transparent electrodes 3 arranged inside the glass substrates 30 and 32.
4, 36, and a liquid crystal layer 42 sandwiched between alignment films 38, 40.
And.

That is, the light passing through the polarizing plates 22 to 24 becomes a predetermined linearly polarized light, which is incident on the liquid crystal panel 12. Here, the transparent electrodes 34 and 36 are made of, for example, an ITO film mainly containing indium oxide, and are patterned according to the purpose. The transparent electrodes 34 and 36 are attached to the glass substrates 30 and 32, respectively. When a voltage is applied to the transparent electrodes 34 and 36 by a power source 44, the molecules of the liquid crystal layer 42 between the alignment films 38 and 40 are reduced. They can be arranged in a certain form. The liquid crystal layer 44 is provided with, for example, a nematic liquid crystal with a layer thickness of about 6 μm, and uses bead-like fine particles (not shown) made of, for example, silicon dioxide as a spacer in order to keep this interval constant.

The liquid crystal display device 10 configured as described above
According to FIG. 2, when no voltage is applied, the liquid crystal molecules are gradually twisted by the grooves of the alignment films 38 and 40 as shown in FIG. In this case, the light beam changes its vibration direction along the twist of the liquid crystal molecules and passes through the polarizing plate 24, so that this portion looks bright to an observer. When a voltage is applied to the transparent electrodes 34 and 36 before and after the alignment films 38 and 40 by the power supply 44, the liquid crystal molecules are aligned in the long axis direction as shown in FIG. In this case, since the vibration direction of the light beam passing through the liquid crystal layer 42 does not change, the light beam is
And this part appears dark to the observer.

[0011] In this manner, the liquid crystal display device of the illustrated example can display a predetermined character.
What is characteristic in the present invention is that the color of the character observed when using external light and when using the internal light source is different.For this reason, in the present embodiment, the low titanium oxide-coated mica powder is used. Used. That is, as shown in FIG. 3, a light diffusing powder 48 is dispersed in a transparent resin substrate 46, and the powder 48 is formed by coating mica 49 with titanium oxide. The titanium oxide layer is obtained by reducing a part of the titanium dioxide 50 to lower titanium oxide 52. When the white light 54 is incident, a part of the light is reflected at the boundary between the resin and the titanium oxide layer and at the boundary between the titanium oxide and the mica. Therefore, the respective reflected lights 56, 58
Has an optical path difference depending on the thickness of the titanium oxide layer. As a result, interference occurs between the two reflected lights 56 and 58, and only light of a specific color tone is enhanced.

Here, when only titanium dioxide is present on the surface of mica, most of the light is transmitted interference light because titanium dioxide and mica have high light transmittance. It is generally said that the transmitted interference light 60 has a complementary color relationship with the reflected interference light 62.
Returns from the reflection plate 18, for example, the reflected light 6
2 and the return light 64 are neutralized, resulting in a color close to white light. However, in this embodiment,
As described above, since the surface of titanium dioxide is reduced by low-order titanium oxide, when white light is incident, reflected light 56.
58 is the same as that described above, but the transmitted interference light 60 passes through the dark low-order titanium oxide layer twice, and further reflects on the reflector and passes through the titanium-based powder again, so that the transmitted interference light 60 is darkened over 4 degrees. It will pass through the lower titanium oxide layer. For this reason, the influence of the feedback light 64 is reduced, and the interference light of the reflected lights 56 and 58 is relatively significantly enhanced.

On the other hand, when the internal light source 16 is used, the light from the light source 16 is guided to the light guide plate 20 and passes through the transflective reflector 14. That is, the transmitted interference light 6 shown in FIG.
0 is directly radiated to the liquid crystal panel 12, which has a complementary color relationship with the reflected interference light 62. Therefore,
According to the liquid crystal display device using the transflective reflector according to the present embodiment, when using external light, reflected interference light is used, and when using an internal light source, transmitted interference light having a complementary color relationship with it is used. It is possible to obtain a display excellent in the design of different colors depending on the light source used.

FIG. 4 shows the spectrum of the transmitted interference light and the spectrum of the reflected interference light when the light diffusing mica powder having the interference color is used. In the test shown in the figure, 1 g of powder was applied to nitrocellulose lacquer 15
g and dispersed on a polycarbonate film using a bar coater. The layer thickness was 200 μm. As is clear from the figure, the transmitted interference light and the reflected interference light
Each shows a different spectral waveform. For example, referring to FIG. 4, the transmitted interference light has a peak near 540 nm (yellow-green region), while the reflected interference light has a peak of 510 nm.
It shows a dip at ５520 nm and has a peak after 600 nm (red region).

Therefore, when external light is used, the character is displayed in a red-based color, whereas when the internal light source is used, the character is displayed in a yellow-green color. As described above, according to the liquid crystal display device using the transflective reflector according to the present invention, different color tones can be obtained in the external light use mode and the internal light source use mode. Each of these colors can be defined by the thickness of the titanium oxide layer. Next, the relationship between the color tone of the reflection interference color and the geometric thickness (mμ) of the titanium oxide layer will be described.

[0016]

[Table 1] Reflection interference color Geometric layer thickness of titanium oxide (mμ)銀 Silver 20-40 Light gold 40-90 Gold 40-90 Red 90-110 Tin 110-120 Blue 120-135 Green 135-155 Second Order Gold 155-175 Second Order Antique 175-200 $

Accordingly, each of the above colors can be displayed when using external light, and a substantially complementary color can be displayed when using an internal light source. Note that the relationship between the layer thickness and the reflection interference color described in Table 1 above is a rough guide. For example, when the powder is kneaded into a transparent substrate to form a transflective reflector,
The color tone changes slightly depending on the refractive index of the resin or the like constituting the transparent substrate. The mica in the case of forming the low titanium oxide-coated mica powder having the light diffusing property can be generally muscovite-based mica. The definition of the interference color can be further improved. The particle size is about 1 to 50 μm. Among them, those having a small particle size and as flat as possible the particle shape are preferable in order to exhibit more beautiful color tone and pearl luster.

Here, the synthetic mica is represented by the following general formula. X _1/3 to ₁ Y ₂ to ₃ (Z ₄ O ₁₀ ) F ₂ (where X is Na ⁺ , K ⁺ , Li ⁺ , Ca ²⁺ , Rb ²⁺ , Sr
²⁺ represents one or more ions selected from the group consisting of
Are Mg ²⁺ , Fe ²⁺ , Ni ²⁺ , Mn ²⁺ , Al ³⁺ , Fe ³⁺ ,
Represents one or more ions selected from the group consisting of li ^+, Z is ^{Al 3+, Si 4 +, Ge} 4+, Fe 3+, represents one or more ions selected from the group consisting of B ^3+. A general method for producing synthetic mica powder is, for example, in the case of synthetic fluorophlogopite, after mixing about 40 parts of silicic anhydride, about 30 parts of magnesium oxide, about 13 parts of aluminum oxide and about 17 parts of potassium silicofluoride, It is melted at 1400-1500 ° C. and crystallized at 1300-1400 ° C. to obtain synthetic fluorophlogopite (KMg (AlSi ₃ O ₁₀ ) F ₂ ). The obtained ore of synthetic fluorophlogopite is crushed and classified to obtain a synthetic fluorophlogopite powder.

The low-order titanium oxide-coated mica powder used in the present invention is a powder in which the surface of mica particles is coated with titanium dioxide and low-order titanium oxide, or low-order titanium oxide.
Various methods can be employed to manufacture this. For example, a commercially available titanium dioxide-coated mica
A gas having a reducing power such as hydrogen gas and ammonia gas at a temperature of 0 to 1000 ° C., preferably 700 to 900 ° C., or a gas having such a reducing power and a helium gas, an argon gas or a nitrogen gas A method of heating and reducing by a mixed gas with an inert gas such as, a method of mixing titanium dioxide with commercially available titanium dioxide-coated mica, and a method of heating and reducing the mixture by the above method;
Alternatively, metallic titanium, silicon, aluminum and the like are added to and mixed with titanium dioxide-coated mica, and the mixture is dried under vacuum.
A method of reducing by heating at 0 to 1000 ° C., preferably 700 to 900 ° C. can be mentioned. Further, an aqueous solution of an inorganic acid salt of titanium (for example, titanyl sulfate) is hydrolyzed in the presence of the above-mentioned mica to precipitate hydrous titanium dioxide on the surface of the mica particles. A gas having a reducing power such as hydrogen gas and ammonia gas at a temperature of ℃ and helium gas,
Argon gas, reduction by heating with a mixed gas with an inert gas such as nitrogen gas, or precipitation of hydrous titanium dioxide on the surface of mica particles, followed by heating to produce titanium dioxide-coated mica, which is then subjected to the same method as described above. May be reduced. Further, the method of reduction, for example, a method of reducing titanium dioxide using a reducing flame such as hydrogen, mica titanium salt,
For example, a method of suspending the suspension in a titanium tetrachloride solution and subjecting the suspension to oxidative decomposition in a flame of a mixed gas of air and hydrogen may be employed.

The amount of titanium dioxide and the lower titanium oxide or the lower titanium oxide which coats the mica can be varied in a wide range. Usually, 0 to 60 parts by weight of the titanium dioxide is added to 100 parts by weight of the mica. 0.01-60 titanium oxide
It can be coated in parts by weight. When the amount of the lower titanium oxide is less than 0.01 part by weight based on 100 parts by weight of mica, an appropriate color tone may not be exhibited. On the other hand, if it exceeds 60 parts by weight, the properties of the mica are remarkably deteriorated, and the aggregation of particles tends to occur. The same applies to the case where the amount of titanium dioxide exceeds 60 parts by weight with respect to 100 parts by weight of mica.

The low order titanium oxide in the present invention is a compound of titanium having a lower valence than tetravalent titanium. The general formula is represented by Ti _n O _2n-1 (n is a positive integer),
It is a general term for titanium oxide such as Ti ₂ O, TiO, Ti ₂ O ₃ , Ti ₃ O ₅ , and Ti ₄ O ₇ or titanium oxynitride in which titanium oxide contains nitrogen. In the present invention,
It is also possible to use a powder in which the low-order titanium oxide-coated mica described above is further coated with titanium dioxide.

In this case, in the mica coated with lower titanium oxide, which is an intermediate, the total amount of the titanium compound coated on the mica is preferably 200 mm or more in thickness, and more excellent appearance color and interference color When it is intended to obtain a material having the following, it is preferable that the angle is 900 ° or more. In the present embodiment, the amount of titanium dioxide in the outermost layer is preferably about 50 to 5000 in terms of the thickness of the layer.

Here, as a method of further coating the surface of the low order titanium oxide-coated mica powder with titanium dioxide,
A method of heating and oxidizing low-order titanium oxide-coated mica in the atmosphere at a temperature of 140 to 400 ° C., by hydrolyzing an aqueous solution of an inorganic acid salt of titanium (for example, titanyl sulfate) in the presence of the low-order titanium oxide-coated mica. A method of precipitating hydrous titanium dioxide on the surface of low-order titanium oxide-coated mica, and then heating the same in the atmosphere is exemplified.

The transflective reflector according to the present invention comprises a resin and titanium oxide-coated mica powder. As the resin, an organic solvent-soluble resin, a water-soluble resin, a thermoplastic resin, a thermosetting resin, an ultraviolet curable resin, an electron beam curable resin, or the like can be used. Then, there is a method of mixing the powder in the molten resin and solidifying and molding it into a reflection plate, or a method of adhesively applying the powder on a resin plate. In this case, the compounding amount of the powder is preferably 1 to 70% by weight, and if it is less than 1% by weight, a sufficient color tone cannot be obtained, and the reflection efficiency also decreases. On the other hand, when the content exceeds 70% by weight, the light utilization efficiency tends to decrease and the strength of the substrate tends to deteriorate.

When the powder is applied on the substrate, the powder is dispersed or mixed in a resin binder such as polyacryl, polyurethane, polycarbonate, polyester or the like, and is printed or coated on the substrate. Examples of the printing method include screen printing, roll coat printing, and offset printing, and examples of the coating method include a method using a knife coater and a comma coater.

A transparent, translucent, white resin sheet is used for the substrate, and the thickness is about 10 to 1000 μm. If necessary, a plasticizer may be added to the resin in an amount of 20 to 100% by weight. Further, a surface treatment such as embossing may be performed on the substrate as necessary. On the other hand, when the powder is kneaded into the substrate, it is similarly molded to a thickness of about 10 to 1000 μm. If necessary, a plasticizer may be added to the resin in an amount of 20 to 100% by weight.

Examples of the organic solvent-soluble resin include olefin resins such as polyethylene, polypropylene, polybutylene and polybutadiene, acrylic resins such as polymethyl methacrylate and ethylene-ethyl acrylate copolymer, polystyrene, AS resin and BS resin. , And ABS
Styrene resin such as resin, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, ethylene vinyl acetate copolymer, polyvinyl butyral, vinylidene chloride / acrylonitrile copolymer, vinyl chloride / vinyl acetate copolymer, vinyl chloride Vinyl resins such as vinylidene chloride copolymer and propylene / vinyl chloride copolymer, polyamide resins such as nylon 6, nylon 66 and nylon 12, saturated polyester resins, polycarbonate resins, polyacetal resins, polyphenylene oxide resins, and polyphenylene sulfide resins , Polysulfone resin, polyurethane resin, tetrafluoroethylene resin, trifluoroethylene resin, fluorine resin such as polyvinylidene fluoride, fiber such as ethylene cellulose, cellulose acetate and nitrocellulose. Motokei resins, epoxy resins, ionomer resins, and rosin derivative resins.

Examples of the water-soluble resin include gelatin, glue, hydroxyethyl cellulose, carboxymethyl cellulose, methyl cellulose, carboxymethyl hydroxyethyl cellulose, hydroxyethyl starch,
Gum arabic, saccharose octaacetate, ammonium alginate, sodium alginate, polyvinyl alcohol, polyvinyl butyral, polyvinyl pyrrolidone, polyvinyl amine, polyethylene oxide, polystyrene sulfonic acid, polyacrylic acid, polyamide and isobutylene / maleic anhydride copolymer are exemplified. You.

As the thermosetting resin, natural rubber,
Isoprene rubber, styrene-butadiene rubber (SB
R), rubbers such as acrylonitrile / butadiene rubber, butyl rubber, ethylene / propylene rubber, chloroprene rubber, acrylic rubber, chlorosulfonated polyethylene rubber, hydrin rubber, urethane rubber, polysulfide rubber, silicone rubber and fluorine rubber, and rubbers of these rubbers mixture,
Mixtures of the above rubbers and organic or inorganic substances, unsaturated polyesters, epoxy resins, xylene resins, polyamide-imide resins, polyurethane resins, olefin resins, allyl resins, melamine resins, furan resins, urea resins, phenol resins, phenol Examples include a formaldehyde resin, a polyester / amino resin, and an alkyd resin. In addition, examples of the ultraviolet curable resin and the electron beam curable resin include acrylic and epoxy resins.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below. [Production Example 1] Production of mica 40 parts by weight of silicic anhydride, 30 parts by weight of magnesium oxide, 13 parts of aluminum oxide and 17 parts of potassium silicofluoride were mixed, then melted at 1500 ° C and crystallized at 1350 ° C. The mica was coarsely and finely pulverized to obtain 100 parts by weight of a synthetic fluorophlogopite powder having a particle size of 2.5 μm.

Production of low-order titanium oxide-coated mica 50 parts of the above mica was added to 500 parts of ion-exchanged water, sufficiently stirred and uniformly dispersed. The obtained dispersion has a concentration of 40.
208.5 parts of a weight% aqueous solution of titanyl sulfate was added, and the mixture was heated with stirring and boiled for 6 hours. After allowing to cool, the mixture was filtered, washed with water, and calcined at 900 ° C. to obtain 90 parts of mica coated with titanium dioxide. Next, the obtained titanium dioxide-coated mica was flowed at a flow rate of 3 l / mi.
The reduction treatment was performed at 800 ° C. for 4 hours under a flow of ammonia gas of n, and after cooling, the powder was recovered. The resulting powder exhibited blue pearl luster in both appearance color and reflection interference color.

Production of semi-transmissive reflection plate The above-mentioned powder was added to an acrylic resin lacquer and dispersed and mixed with a homogenizer, and screen-printed on a polyethylene terephthalate sheet to a thickness of 50 μm. This is heated and cured at 60 ° C. to produce a transflective reflector. The obtained transflective reflector is attached to the back surface of a normally white mode TN type liquid crystal panel (a polarizing plate is arranged orthogonally) with the powder layer facing upward. A backlight unit composed of a white cold-cathode tube and an aluminum reflector was attached below the transflective reflector to produce a liquid crystal display device.

In the case of powder mixing, a powder / resin mixture having the following composition is formed, formed into a desired thickness, formed into a plate shape, and then dried by heating to form a semi-transmissive reflection plate. Obtained. Polyester resin 60 parts by weight Titanium oxide-coated mica (reflection interference color: blue) 40 parts by weight Cyclohexanone 50 parts by weight Methyl ethyl ketone 50 parts by weight Toluene 50 parts by weight

[Production Example 2] Production of Powder The powder obtained in Production Example 1 was further coated with titanium dioxide. That is, the low-order titanium oxide-coated mica 50
The parts by weight were further added to 500 parts of ion-exchanged water, sufficiently stirred, and uniformly dispersed. 300 parts of an aqueous solution of titanyl sulfate having a concentration of 40% by weight was added to the obtained dispersion, and the mixture was heated with stirring and boiled for 6 hours. After standing to cool, filter and wash with water 200
C. at 110.degree. C. to obtain 110 parts of low-grade titanium oxide-coated mica coated with titanium dioxide. The resulting powder had a bright green appearance color and a matching reflection interference color.

Production of transflective reflector A powder / resin mixture having the following composition was formed, formed into a desired thickness, formed into a plate shape, and dried by heating to obtain a transflective reflector. Polyester resin 70 parts by weight Titanium oxide-coated mica (reflection interference color: green) 30 parts by weight Cyclohexanone 50 parts by weight Methyl ethyl ketone 50 parts by weight Toluene 50 parts by weight

[0036]

As described above, according to the transflective reflector or the liquid crystal display device of the present invention, since the transflective reflector contains the mica powder containing low-order titanium oxide, it is possible to utilize external light. Character display of different colors can be performed when using the time and the internal light source.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a general liquid crystal display device.

FIG. 2 is an explanatory diagram of a character display mechanism of a liquid crystal panel.

FIG. 3 is an explanatory diagram of a two-color display mechanism characteristic of the present invention.

FIG. 4 is an explanatory diagram showing an example of the spectrum of the transmission interference light and the reflection interference light of the transflective reflector used in the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 liquid crystal display device 12 liquid crystal panel 14 semi-transmissive reflector 48 light diffusing powder 49 mica 50 titanium dioxide 52 low order titanium oxide 60 transmission interference light 62 reflection interference light

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[Procedure amendment]

[Submission date] April 9, 1997

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG. 2

FIG. 3

FIG.

FIG. 4

Claims (5)

[Claims] 1. A semi-transmissive reflection plate comprising a light-diffusible titanium oxide-coated mica powder having a mica surface coated with a titanium oxide layer containing low-order titanium oxide in a substrate. 2. The transflective reflector according to claim 1, wherein the mica surface of the mica powder coated with titanium oxide is coated with titanium dioxide and low titanium oxide, or low titanium oxide. Transflective reflector. 3. The transflective reflector according to claim 1, wherein the mica surface of the titanium oxide-coated mica powder is coated with low-order titanium oxide or a titanium compound containing low-order titanium oxide, and further has a surface thereof. A transflective reflector, characterized by being coated with titanium dioxide. 4. The semi-transmissive reflection plate according to claim 1, wherein the titanium oxide-coated mica powder is contained in the substrate in an amount of 1 to 70% by weight. Type reflector. 5. A liquid crystal panel whose light transmission and non-transmission states can be controlled by an electric signal, an internal light source disposed on the back side of the liquid crystal panel, and a half disposed between the internal light source and the liquid crystal panel. And a transmissive reflector, wherein the transflective reflector is the transflective reflector according to any one of claims 1 to 4.