JPH09113888A - Liquid crystal display device and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the reflection factor and total transmissivity and to improve the contrast, black deepness and color purity by forming a film which has wavelength selective absorptivity on an upper glass substrate. SOLUTION: The liquid crystal 3 is sandwiched between a couple of glass substrates 1 and 2 and the wavelength selecting light absorptive film 8 is formed as the base layer of a functional film group 4 formed on the liquid-crystal side surface of the upper glass substrate 1 by using at least one kind of oxide selected among silicon, zinc, and titanium as a principal component and adding a coloring component giving wavelength selective absorptivity thereto. Further, a wavelength selecting light absorptive film 9 is formed of similar materials on the top surface of an upper polarizing plate 6. Outside the lower glass substrate 2, i.e., on the reverse surface of a liquid crystal display device, what is called a backlight is arranged to lighten up the entire display surface of the liquid crystal display device. The films 8 and 9 are both provided to improve the contrast, black deposition, and color purity more.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device excellent in co-trust, black sunk and color purity and a method for manufacturing the same.

[0002]

2. Description of the Related Art In a liquid crystal display device, since the upper polarizing plate surface (outer surface), which is the image display surface, is generally in a glossy state, it is easy to reflect external light, and the contrast is lowered to display a picture. There is a problem that it is difficult to read images such as letters and letters.

This problem has been taken up as a problem of the working environment of the operator when the information device is used as a terminal, and under these circumstances, antireflection measures for liquid crystal display devices are strongly required.

Further, yellowish light having a wavelength in the range of 575 nm to 580 nm is mixed to cause a decrease in color purity.

As anti-reflection measures, there are methods such as so-called silica spray coating on the surface of the upper polarizing plate and non-glare treatment, or forming a multilayer film by sputtering or the like to provide an anti-reflection film due to light interference. Proposed.

As a disclosure of the prior art relating to this type of antireflection film, for example, Japanese Patent Laid-Open No. 61-120.
No. 121, and JP-A-60-21874, in which a layer of silica particles is formed on the panel surface of a cathode ray tube.
No. 7 can be cited.

[0007]

As described above, the problems to be solved in the liquid crystal non-device are (1) improvement of contrast by antireflection, (2) improvement of black depression in non-lighted portion, and (3) color. There is an improvement in purity.

An example of applying the above-mentioned silica spray coat, which has been proposed as a means for preventing reflection on the display surface of a liquid crystal display device, will be described.

FIG. 8 is a sectional view schematically showing the structure of a conventional liquid crystal display device. 1 is an upper glass substrate, 2 is a lower glass substrate, 3 is a liquid crystal, 4 is an upper functional film group, and 5 is an upper functional film group. A lower functional film group, 6 is an upper polarizing plate, and 7 is a lower polarizing plate.

The upper functional film group 4 is mainly composed of a color filter, a scanning electrode and an alignment film, and the lower functional film group 5 is mainly composed of a thin film transistor, a signal electrode and an alignment film.

Further, E is the intensity of external light, R ₁ is the reflectance of the upper polarizing plate 6, R ₂ is the reflectance of the upper glass substrate 1, B is the brightness (luminance) of the light source (backlight), T Is the total transmittance.

In the case of the liquid crystal display device having the structure shown in FIG.
The contrast C is defined by the following equation (1).

[0013]

(Equation 1)

A polarizing plate on the outer surface of the liquid crystal display device,
Here, the reflectance of the upper polarizing plate 6 with respect to air is R ₁ , the reflectance at the internal interface of the upper glass substrate 1 is R ₂ , the total transmittance is T, the brightness of the liquid crystal display device is B (cd / m ² ), When the brightness of extraneous light is E (cd / m ² ), the contrast C is calculated by the following equation (2).

[0015]

(Equation 2)

From the equation (2), the reflection "ER ₁ " of the upper polarizing plate 6 and the reflection "E (1-R ₁ ) of the upper glass substrate 1 are obtained.
It can be seen that the contrast C can be increased by providing a means for reducing “ ² R ₂ T ² ”.

Further, in the non-lighted portion, due to the color tone of the reflection color and slight transmission color of the color filter and the body color of the liquid crystal or the glass substrate (body color), the originally black portion looks like a greenish color, There was a problem that the so-called black sunken state did not occur.

Further, the lighting portion has a problem that the yellowish transmitted color which is an intermediate color between the red filter and the blue filter is emphasized in the emission spectrum of the color tone of the backlight, so that the purity is deteriorated. It was

Further, conventionally, there is also a method of attaching a film having an antireflection film of a light interference multilayer film formed by sputtering or the like. Although this has excellent characteristics, it requires large-scale manufacturing equipment such as a sputtering device and is very expensive.

An object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a liquid crystal display device having a novel structure and a manufacturing method thereof which simultaneously satisfy antireflection performance, high contrast, high color purity and low manufacturing cost. To provide.

[0021]

In order to achieve the above object, the first invention according to claim 1 is provided as a constituent material between a pair of upper and lower glass substrates and the pair of glass substrates. In a liquid crystal display device having at least a color filter, a switching element, a liquid crystal, an alignment film, and an upper polarizing plate and a lower polarizing plate respectively laminated on the pair of glass substrates, at least a display surface of the pair of glass substrates is formed. On the liquid crystal side surface of the glass substrate, or on the liquid crystal side surface of the glass substrate and the display surface side surface of the upper polarizing plate, at least one oxide selected from silicon, zinc, and titanium is used as a main component, And a wavelength-selective light-absorptive coating formed by adding a coloring component exhibiting wavelength-selective absorptivity.

A second invention according to claim 2 is, as constituent materials, a pair of upper and lower glass substrates, and a color filter, a switching element, a liquid crystal, an alignment film provided between the pair of glass substrates, and In the method for manufacturing a liquid crystal display device having at least an upper polarizing plate and a lower polarizing plate, which are laminated on the pair of glass substrates, an alcohol solution of at least one alkoxide selected from silicon, zinc, and titanium is added to water. , A sol liquid that is hydrolyzed and polycondensed in the presence of an acid catalyst to prepare a sol liquid, and a liquid crystal-side surface of the upper glass substrate or a liquid crystal-side surface of the glass substrate and the upper polarized light. It is characterized in that a wavelength-selective light-absorptive film is formed by applying it to the surface of the plate on the display surface side and polymerizing it by heating to form a gel.

[0023] Further, the third invention according to claim 3 provides:
The colorant in the second invention is selected from xanthene dyes, anthraquinone dyes, phthalocyanine dyes, triphenolmethane dyes, azo dyes, indigoid dyes, carbonium ion dyes, and pigments. It is characterized in that it is at least one kind.

[0024]

1 is a schematic cross-sectional view for explaining the basic structure of a liquid crystal display device according to the present invention, in which 1 is an upper glass substrate, 2 is a lower glass substrate, 3 is a liquid crystal, and 4 is an upper functional film. Group 5, 5 is a lower functional film group, 6 is an upper polarizing plate, 7 is a lower polarizing plate, 8 is a wavelength selective light absorbing film formed on the upper functional film group 4 side of the upper glass substrate 1, and 9 is an upper polarizing film. It is a wavelength selective light absorbing film formed on the surface of the plate 6.

The upper functional film group 4, the lower functional film group 5,
And E, R ₁ , R ₂ , B, and T are the same as those in FIG.

In the figure, a liquid crystal 3 is sandwiched between a pair of glass substrates, and silicon, zinc, or silicon is used as a base layer of the functional film group 4 formed on the liquid crystal side surface of the upper glass substrate 1.
A wavelength-selective light-absorptive coating 8 is formed by using at least one kind of oxide selected from titanium as a main component and adding a coloring component exhibiting wavelength-selective absorption thereto.

A wavelength-selective light-absorptive coating 9 made of the same material is also formed on the surface of the upper polarizing plate 6.

A so-called backlight (not shown) is arranged on the outer surface of the lower glass substrate 2, that is, on the back surface of the liquid crystal display device so as to illuminate the entire display surface of the liquid crystal display device. .

The wavelength selective light absorbing coatings 8 and 9 described above are
It may be formed on only one of them, especially on the upper glass substrate 1, but by providing both of them, contrast, blackening, and color purity can be further improved.

The colorant (wavelength selective light absorbing colorant) for forming the wavelength selective light absorbing coating is a xanthene dye, anthraquinone dye, phthalocyanine dye, triphenolmethane dye, azo. At least one selected from the group consisting of dyes, indigoid dyes, carbonium ion dyes, and pigments is used.

The manufacturing method in the case of providing the wavelength selective light absorbing coating 8 only on the upper glass substrate 1 is as follows.

That is, an alcohol solution of at least one metal alkoxide selected from silicon, zinc, and titanium is hydrolyzed in the presence of water and an acid (for example, nitric acid) catalyst, and polycondensed to obtain a sol liquid. Then, the one to which the above-mentioned coloring agent is added is applied to the surface of the upper glass substrate by a spin coating method, a spray coating method, a dip coating method, or another coating method.

After coating, heat polymerization proceeds to cause gelation to obtain the wavelength-selective light-absorbing coating 8.

The wavelength-selective light-absorptive coloring material includes neodymium (Na ₂ O ₃ ) in addition to the above-mentioned organic dyes and pigments.
Inorganic oxides such as the above can also be used, but an organic dye, which is very effective when added in a small amount, is most suitable.

As silicon, zinc and titanium alkoxides, it is desirable to use ethyl silicate, zinc butoxide, titanium tetra-isopropoxide and the like, respectively. The film coated with at least one alcohol solution selected from alkoxides of silicon, zinc, and titanium may be smooth or may have slight irregularities that do not impair the contrast. .

As the organic dye to be added, xanthene dyes, anthraquinone dyes, phthalocyanine dyes, triphenolmethane dyes, azo dyes, indigoid dyes and carbonium ion dyes are suitable. Moreover, a pigment can also be used.

Coloring materials such as organic dyes, that is, light absorbing materials, have different light resistance (coloring life) depending on the type and molecular structure thereof, but in general, there are those that cause fading or discoloration with respect to ultraviolet rays or sunlight. In order to prevent this, a base coated with a sol solution containing an organic dye is formed, and an organic dye is not added or a small amount thereof is added, and a component that absorbs more ultraviolet light (for example, TiO ₂ , ZnO
It is also possible to have a two-layer structure in which a film added with (1) or the like is formed.

In the case of a multilayer film, the antireflection property due to the interference of light can be obtained by appropriately setting the optical film thickness (refractive index × physical film thickness). Of course, even with a single-layer film, antireflection property can be obtained by making the refractive index smaller than that of the glass substrate.

By thus forming the coating 8 having wavelength selective absorption on the upper glass substrate, the reflectance R ₂ and the total transmittance T shown in the formula (2) can be reduced, Improves contrast, blackout, and color purity.

Further, by forming a film 9 having a wavelength-selective absorptivity having the same composition as the above on the surface of the upper polarizing plate 6, the reflectances R ₁ and R ₂ and the total transmittance T are obtained.
As shown in FIG. 1, the reflection amount ER ₁ of the upper polarizing plate 6 and the reflection amount E (1-R ₁ ) ² R ₂ T ^{2 of the} upper glass substrate 1 with respect to the incident external light E are reduced. However, it is possible to significantly improve the contrast, the blackening, and the color purity.

The present invention is not limited to the one using a glass substrate as the substrate of the liquid crystal display device, but is similarly applied to the one using a plastic material such as a plastic plate or a plastic film in place of the glass substrate. It is possible.

[0042]

EXAMPLE An example of the liquid crystal display device according to the present invention will be described below.

The substrate for forming the wavelength selective absorptive film according to the present invention is the above-mentioned glass substrate and polarizing plate,
When the object is a plastic material, those using polyethylene, polypropylene, urethane, acrylic, phenol, epoxy, melanin, nylon, polyimide, polycarbonate, butyl, epoxyphenol, vinyl chloride, polyester, etc. as the main component. Can be mentioned.

When a glass substrate is used, it is desirable to perform a pretreatment such as an alkali treatment or a fluorine treatment if the wettability with the substrate is taken into consideration.

In the case of targeting a plastic material, the above-mentioned pretreatment is preferably washing with a neutral detergent, and it is desirable to use a coupling material having a functional group for the plastic material together. .

When the substrate for forming the wavelength selective absorptive film is a glass substrate, a coating liquid prepared by adding a predetermined amount of an organic dye and / or pigment to a sol liquid containing alcohol in which Si (OR) ₄ is dissolved. In the case where the substrate for forming the wavelength-selective absorptive film is a plastic plate, Si (OR) _X (where X is 2 to 4 is used) and a functional group that easily reacts with the polymer constituting the plastic. , Preferably 3)
A silane coupling agent containing
A coating solution is prepared by adding a predetermined amount of organic dye and / or pigment to a sol solution containing alcohol in which a mixed solution of (OR) ₄ and a silane coupling agent is dissolved.

By adding a small amount of H ₂ O and an acidic catalyst to the above solution, the decomposition of the metal alkoxide is promoted and the film-forming property and the caking property are improved.

As the organic dyes used in this embodiment, many dyes such as xanthene dyes, anthraquinone dyes, phthalocyanine dyes, triphenolmethane dyes, azo dyes, indigo dyes, carbonium ion dyes, etc. Can be used. Inorganic dyes can also be used.

The pigments may be used alone or in combination with the above dyes. The pigment is an inorganic pigment such as an oxide,
Hydroxides, carbon black, chromic acid, carbonates, silicates, phosphates, ferrocyanides, metal powders, etc. can be used, and as organic pigments, azo pigments, phthalocyanines,
A condensed polycyclic pigment, etc. can be used.

The kind and addition amount of these coloring materials (light absorbing materials) are determined according to the intended color tone and light absorbing performance.

The coating film-forming solution having the wavelength-selective light-absorbing property thus prepared is applied to the film-forming substrate (glass substrate or polarizing plate) at room temperature or at a temperature of 60 ° C. or lower.

This coating is performed by a spin coating method, a spraying method, a dipping method or a combination thereof.

After coating on the surface of the film-forming substrate, in order to cure the coating film, the coating surface is heated to 100 ° C to 200 ° C.
It is desirable to heat at C. However, since the decomposition of the components gradually progresses even at room temperature, the heat treatment may be performed within the allowable temperature range of each member constituting the liquid crystal display device.

When the wavelength-selective light-absorbing coating has the above-mentioned two-layer structure, the first layer is heated before applying the second layer, or the first layer is applied together with the first layer after applying the second layer. Simultaneous heating may be applied.

FIG. 2 is an explanatory view of the spectral transmittance of the wavelength selective light absorbing film and the color filter and the spectral spectrum of the backlight which constitute the liquid crystal display device in one embodiment of the liquid crystal display device according to the present invention. Wavelength (n
m) is shown by taking the transmittance and the emission intensity (relative value) on the vertical axis.

In the figure, is the spectral transmittance curve of the wavelength selective light absorbing film formed on the upper glass substrate ,.
Shows the spectral transmittance curves of the red filter, the green filter and the blue filter, respectively, and shows the emission spectrum distribution curve of the backlight.

In the lit part, the light of the wavelength near point B where the spectral transmittance curve of the red filter and the spectral transmittance curve of the green filter intersect shows a transmitted color of a yellow color tone which is an intermediate color between them, and this is the backlight. Is emphasized by light having a wavelength in the vicinity of point C, which is one of the peaks of the emission intensity of.
Therefore, black sinking is insufficient and the color purity is impaired. However, since the wavelength-selective light-absorbing coating according to the present invention has a light-absorbing region in the vicinity of point A in the figure, the intensity of the yellowish transmitted light described above is suppressed, and as a result, black depression is sufficient,
Color purity is improved.

The above-mentioned effect can be obtained even if the above-mentioned wavelength-selective light-absorptive film is provided only on the liquid crystal side of the upper glass substrate, but a similar wavelength-selective light-absorptive film is further formed on the surface of the upper polarizing plate. As a result, sufficient black sinking and improvement in color purity are achieved.

FIG. 3 is an explanatory diagram comparing a concrete configuration example of the wavelength-selective light-absorptive film according to the present invention and its effect with the prior art. In FIG. 3, reference numeral 1 indicates a conventional structure having no wavelength-selective light-absorptive film. Liquid crystal display devices 2 to 7 are various specific examples of the present invention.

The contrast of the conventional liquid crystal display device was as low as about 10 (9.6 in the figure), the black sinking was incomplete, and the color purity was mixed with yellow.

On the other hand, in Examples 2 to 7 of the present invention, since the wavelength-selective light-absorbing coating film has the wavelength-selective light-absorbing property and the antireflection property, the contrast is 11 at the minimum and 51 at the maximum. Has become.

Also, good results were obtained in terms of black sinking and color purity. In particular, in Examples 5 and 6 and 7, since the wavelength-selective light-absorbing coating has a two-layer structure and the film thickness is accurately controlled, antireflection manufacturing utilizing the interference of light is also provided, the reflectance R ₁ Is extremely small, and since Example 7 has a wavelength-selective light-absorbing thin film having a two-layer structure on both the glass substrate and the polarizing plate, the reflectance R ₂ is also small (the total transmittance T prevents a decrease in brightness). Therefore, it is understood that the contrast is improved by 2 to 5.0 times as compared with Example 1 by adjusting so that both films have 80%.

As described above, by providing the wavelength-selective light-absorbing coating of the present invention, the contrast, the black sunkenness, and the color purity are all good, and a liquid crystal display device capable of displaying high-quality images can be provided.

FIG. 4 is an exploded perspective view illustrating a structural example of a TFT type liquid crystal display module assembled using the liquid crystal display device according to the present invention.

In the figure, MDL is a liquid crystal display module, SHD is a metal shield case which is an upper frame, WD is a display window which defines the effective screen of the liquid crystal display module, PNL is a liquid crystal display panel consisting of liquid crystal display elements,
PCB1 is a drain side circuit board, PCB2 is a gate side circuit board, PCB3 is an interface circuit board, PRS is a prism sheet, SPS is a diffusion sheet, GLB is a light guide plate, RFS is a reflection sheet, and LP is a backlight BL lamp. Fluorescent tube, LS reflection sheet, GC rubber bush, LPC lamp cable, MCA light guide plate G
Lower case with opening MO for installing LB, JN1,
2 and 3 are joiners for connecting circuit boards, TCP 1 and 2,
Is a tape carrier package, INS1, 2 and 3 are insulating sheets, GC is a rubber cushion, BAT is a double-sided adhesive tape, and ILS is a light-shielding spacer.

The above-mentioned components are laminated between the metal shield case SHD and the lower case MCA and sandwiched and fixed to form the liquid crystal display module MDL.

The liquid crystal display panel PNL is provided with an upper glass substrate and / or an upper polarizing plate on which a wavelength-selective light-absorptive film treated according to the present invention is formed, and various circuit substrates are attached to the periphery of the upper glass substrate to display images. Is driven for.

Further, on the back surface of the liquid crystal display panel PNL, a back light BL composed of a back lighting structure in which various optical sheets are laminated on the light guide plate GLB and a fluorescent tube LP is installed and formed on the liquid crystal display panel PNL. The displayed image is illuminated and displayed on the display window WD.

FIG. 5 is a plan view showing one pixel and its periphery of an active matrix type color liquid crystal display device to which the present invention is applied.

As shown in the figure, each pixel has two adjacent scanning signal lines (gate signal lines or horizontal signal lines) GL.
(Gate line) and two adjacent video signal lines (drain signal lines or vertical signal lines) DL (data lines) are arranged in an intersecting region (in a region surrounded by four signal lines). There is.

Each pixel is a thin film transistor TFT (TFT
1, TFT2), a transparent pixel electrode ITO1 and a storage capacitor element Cadd (additional capacitor). The scanning signal lines GL extend in the left-right direction in the figure, and a plurality of scanning signal lines GL are arranged in the up-down direction. Further, the video signal lines DL extend in the vertical direction and a plurality of video signal lines DL are arranged in the horizontal direction.

SD1 is a source electrode, SD2 is a drain electrode, BM is a black matrix, and FIL is a color filter.

FIG. 6 is a sectional view taken along line L1-L1 of FIG. 5, in which the lower glass substrate 2 with the liquid crystal 3 as a reference.
On the side, a thin film transistor TFT and a transparent pixel electrode IT
A lower functional film group 5 such as O1 is formed, and an upper functional film group 4 such as a color filter FIL and a light shielding film, that is, a black matrix BM is formed on the upper glass substrate 1 side. The upper glass substrate 1 is generally called a scanning side substrate (or a color filter substrate).

On both surfaces of the upper glass substrate 1 and the lower glass substrate 2, a silicon oxide film S formed by dip processing or the like.
IO is provided.

A wavelength-selective light-absorbing coating 8 is provided on the inner surface (on the side of the liquid crystal layer LC) of the upper glass substrate 1, on which a black matrix BM, a color filter FIL,
Protective film PSV2, common transparent pixel electrode ITO2 (COM)
And an upper functional film group 4 including an upper alignment film ORI2 are sequentially stacked.

The wavelength-selective light absorbing coating 9 is also formed on the upper surface of the upper polarizing plate 6. The film formation and patterning of the above-mentioned thin film including various electrodes are mainly performed by mask exposure using ultraviolet rays and wet development such as etching treatment.

FIG. 7 is an external view of a portable personal computer for explaining an example of an electronic apparatus incorporating a liquid crystal display module using the liquid crystal display element according to the present invention, and the same reference numerals as those in FIG. 4 correspond to the same portions.

This portable personal computer is composed of a main body part having a keyboard and a host CPU built-in, and a display part having a liquid crystal display module MDL and an inverter power supply IV built therein, both of which are connected by a cable connecting a hinge. Has been done.

Also, various adjustment buttons CT,
TCON, CR, etc. are provided, and signals from the keyboard and the host flow as indicated by the arrows and are displayed on the display unit.

By using the liquid crystal display element manufactured by applying the present invention, high quality image display can be performed.

[0081]

As described above, according to the present invention,
Reflection of extraneous light can be effectively suppressed, and the intensity of transmitted light of a specific wavelength can be selectively reduced, making it easier to see the displayed image, displaying contrast, blackout, and vividness of colors. It is possible to provide a liquid crystal display device which can improve quality and can be manufactured at low cost, and a manufacturing method thereof.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view illustrating a basic configuration of a liquid crystal display device according to the present invention.

FIG. 2 is an explanatory diagram of a spectral transmittance of a wavelength-selective light-absorptive coating and a color filter and a spectral spectrum of a backlight which constitute the liquid crystal display device according to an embodiment of the liquid crystal display device of the present invention.

FIG. 3 is an explanatory diagram comparing a specific configuration example of the wavelength-selective light-absorptive coating according to the present invention and its effect with the prior art.

FIG. 4 is an exploded perspective view illustrating a structural example of a TFT type liquid crystal display module assembled using the liquid crystal display device according to the present invention.

FIG. 5 is a plan view showing one pixel and its periphery of an active matrix type color liquid crystal display device to which the present invention is applied.

6 is a cross-sectional view taken along the line L1-L1 of FIG.

FIG. 7 is an external view of a portable personal computer illustrating an example of an electronic device incorporating a liquid crystal display module using a liquid crystal display element according to the present invention.

FIG. 8 is a sectional view schematically showing a configuration of a conventional liquid crystal display device.

[Explanation of symbols]

 1 Upper Glass Substrate 2 Lower Glass Substrate 3 Liquid Crystal 4 Upper Functional Film Group 5 Lower Functional Film Group 6 Upper Polarizing Plate 7 Lower Polarizing Plate 8 Wavelength Selective Light Absorbing Film Formed on Upper Glass Substrate 9 Formed on Upper Polarizing Plate Wavelength selective light absorbing film.

Claims (3)

[Claims] 1. A pair of upper and lower glass substrates as constituent materials,
A color filter provided between the pair of glass substrates, a switching element, a liquid crystal, an alignment film, and a liquid crystal display device having at least an upper polarizing plate and a lower polarizing plate respectively laminated on the pair of glass substrates. Silicon, zinc, on the liquid crystal side surface of the upper glass substrate constituting at least the display surface of the glass substrate, or on the liquid crystal side surface of the glass substrate and the display surface side surface of the upper polarizing plate,
A liquid crystal display device comprising a wavelength-selective light-absorptive film containing, as a main component, at least one kind of oxide selected from titanium and a coloring component exhibiting wavelength-selective absorptivity added thereto. . 2. A pair of upper and lower glass substrates as constituent members,
In a method of manufacturing a liquid crystal display device having at least a color filter provided between the pair of glass substrates, a switching element, a liquid crystal, an alignment film, and an upper polarizing plate and a lower polarizing plate respectively laminated on the pair of glass substrates, A sol liquid obtained by hydrolyzing and polycondensing an alcohol solution of at least one alkoxide selected from silicon, zinc, and titanium in the presence of water and an acid catalyst, and adding a coloring agent to the sol liquid. Is applied to the liquid crystal side surface of the upper glass substrate, or the liquid crystal side surface of the glass substrate and the display surface side surface of the upper polarizing plate to form a wavelength selective light absorbing film by heat polymerization and gelation. A method for manufacturing a liquid crystal display device, comprising: 3. The colorant according to claim 2, wherein the coloring material is a xanthene dye, an anthraquinone dye, a phthalocyanine dye, a triphenolmethane dye, an azo dye, an indigoid dye, a carbonium ion dye, and a pigment. A method for manufacturing a liquid crystal display device, which is at least one selected from the above.