JPH11142834A - Color liquid crystal display device and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain fine color display capable of optimizing assembly between a color filter and a liquid crystal(LC) element by a simple process even in the case of using a film substrate having small rigidity. SOLUTION: An LC element L including upper and lower film substrates 6, 7 sealing an LC layer between them, transparent electrodes 2, 3 for applying orientation to the LC layer 1 and an upper polarizing plate 10 for controlling transmitted light is faced to a filter layer F including at least a color filter 8 and a lower polarizing plate 11 arranged under the filter 8 to control transmitted light and unitedly joined with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color liquid crystal display comprising a liquid crystal element and a color filter, and more particularly to a color liquid crystal display having a film substrate for reducing the thickness and a method of manufacturing the same.

[0002]

2. Description of the Related Art As a liquid crystal display device that colorizes light emitted by a liquid crystal element, a transmission type using a backlight as a light source,
A reflection type that receives and reflects external light and a semi-transmission type that includes a light-transmitting reflection plate are conventionally known. Each of these liquid crystal display devices is provided with a color filter for colorizing the liquid crystal display device together with a liquid crystal element, and this color filter is disposed on the liquid crystal side of a substrate using glass or film, for example. In the case of a transmissive liquid crystal display device, it has a function of separating light from the backlight side and passing only a certain color. Also, in the case of a reflection type liquid crystal display device, the liquid crystal display device is similarly arranged on the liquid crystal side of the glass substrate, and the reflection light from the reflection plate is colored by a color separation function to color the liquid crystal display device.

[0003] As a substrate, a glass substrate has conventionally been the mainstream, but in recent years, a film substrate using a polymer film has been spreading. In the case of a liquid crystal display device using this film substrate, the thickness and weight can be reduced as compared with the case where a glass substrate is used, and the display device is particularly suitable for portable equipment.

FIG. 6 is a longitudinal sectional view showing a main part of a conventional color liquid crystal display device. In this specification, the side from which light is emitted, that is, the side on which the display is viewed is referred to as “upper side”,
The light source side that supplies light is defined as “lower side”.

In FIG. 6, a transparent upper film substrate 36 is provided.
A liquid crystal material is injected between the lower film substrate 37 and the lower film substrate 37 to form a liquid crystal layer 31. Further, an outer polarizer 40 and a lower polarizer 41, each of which can transmit only light of a certain polarization direction, are transparently bonded to the outside thereof. The layers are stacked via the layers 42 and 43. The liquid crystal layer 31 is, for example, a twisted nematic liquid crystal or a super twisted nematic liquid crystal. Upper film substrate 3
The upper transparent electrode 32 and the lower transparent electrode 33 made of transparent conductive ITO are formed in stripes on the surfaces of the lower and upper film substrates 37 and 37 which are in contact with the liquid crystal layer 31. Transparent electrodes 32 above and below
33. A color filter 38 protected by a transparent protective layer 39 is formed between the upper transparent electrode 32 and the upper film substrate 36. Also,
On the lower surface of the lower polarizing plate 41, a reflecting plate 44 is provided with a transparent adhesive layer 45.
Adhered by

[0006] Upper film substrate 36 and lower film substrate 3
Numeral 7 is made of a transparent plastic material such as polycarbonate or polyether sulfone, and has a thickness of about 100 μm.

The reflecting plate 44 uses a thin film of aluminum or the like. Instead of this reflecting plate 44, a semi-transmissive plate may be used.
It is conventionally well known that a light emitting element such as an L element is provided as a light source. That is, the illustrated reflection plate 44
In this case, a reflection-type liquid crystal display that reflects and reflects external light is possible, and when a light source is provided, a transmissive liquid-crystal display that transmits light emitted from the light source and displays the light is used. In the case of using a plate, liquid crystal display by both the reflection type and the transmission type functions is possible.

The color filter 38 has three primary colors, R,
(Red), G (Green), and B (Blue) are uniformly arranged according to a certain pattern. Color filter manufacturing methods include a pigment dispersion method of finely dispersing a color pigment in a photoresist, an electrodeposition method of electrodepositing an electrodeposition resin containing a color pigment on a transparent conductive electrode, and a dyeing method. And a printing method are conventionally known. Among such production methods, a pigment dispersion method that can obtain a high pattern accuracy of R, G, and B in particular has conventionally been the mainstream.

In this pigment dispersion method, since a fine pattern is formed by a photolithography method often used in a semiconductor process, a very high quality product can be obtained. On the other hand, since the application, baking and exposure steps of a photoresist are required for each color, the manufacturing process is very complicated, and an exposure apparatus for exposing the photoresist can form a high-resolution fine pattern. However, since it is extremely expensive, it is said that the cost of the final product is greatly affected.

The operation of the conventional liquid crystal display device thus configured is as follows. In the reflection type color liquid crystal display device having the illustrated reflection plate 44, only the linearly polarized light component parallel to the polarization direction of the lower polarizing plate 41 of the light reflected from the reflection plate 44 by the externally incident light is transmitted. To reach the liquid crystal layer 31. In the liquid crystal layer 31, upper and lower transparent electrodes 32, 33
The alignment state of the liquid crystal changes due to the electric field generated between them, and the polarization direction of light passing through the liquid crystal layer 31 is selectively rotated by 90 °. Then, the transmitted light is colored by the color filter 38, and only the transmitted light having a polarization component parallel to the upper polarizing plate 40 of the colored light is transmitted, and a color display is obtained on the display device by the transmitted light.

[0011]

In the conventional color liquid crystal display device shown in FIG. 6, a step of forming a color filter 38 on a film substrate 36 and further forming a protective film 39 and an upper transparent electrode 32 thereon. Step on. In this case, when the substrate is made of glass, the thickness is 0.7 to 1
mm, which has sufficient rigidity.
6 has a thickness of about 100 μm and thus has a lower rigidity than a glass substrate. When the rigidity of the film substrate 36 is low, it is difficult to hold the film substrate with good flatness, and the accuracy of the thickness and shape of the color filter 38 decreases. For this reason, the color separation characteristics of the color filter 38 become non-uniform, resulting in a problem that good color display cannot be performed.

The problem to be solved in the present invention is to obtain a good color display by optimizing the assembly of a color filter and a liquid crystal element by a simple process even if a film substrate having a small rigidity is used.

[0013]

The color liquid crystal display device of the present invention comprises a pair of upper and lower film substrates enclosing a liquid crystal layer, a transparent electrode for imparting orientation to the liquid crystal layer by an electric field generated, and a pair of upper and lower film substrates. A liquid crystal element including a first polarizing plate that is disposed along one of the light transmitting surfaces of the film substrate and controls transmitted light; a second polarizing plate that controls at least transmitted light; A filter layer in which a color filter is arranged along one of the light transmitting surfaces, and a surface of the second polarizing plate on which the color filter is arranged and a film substrate are opposed to each other to form a liquid crystal element and a film layer. It is characterized by being integrally joined.

The method for manufacturing a color liquid crystal display device according to the present invention comprises a pair of upper and lower film substrates enclosing a liquid crystal layer, a transparent electrode for imparting orientation to the liquid crystal layer by an electric field generated, and a pair of upper and lower films. A liquid crystal element including a first polarizing plate arranged along one of the light transmitting surfaces of the substrate and controlling transmitted light; a second polarizing plate controlling at least transmitted light; and a second polarizing plate The liquid crystal element and the film layer are integrated by fabricating a separate filter layer with a color filter along one of the light transmission surfaces, and facing the color filter to one of the upper and lower film substrates. It is characterized by being joined to.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 comprises a pair of upper and lower film substrates enclosing a liquid crystal layer, a transparent electrode for imparting an orientation to the liquid crystal layer by an electric field generated, and a pair of upper and lower film substrates. A liquid crystal element including a first polarizing plate arranged along one of the light transmitting surfaces and controlling transmitted light, a second polarizing plate controlling at least transmitted light, and one of the second polarizing plate A filter layer in which a color filter is arranged along one light transmission surface, and the surface of the second polarizing plate on which the color filter is arranged and the film substrate face each other, and these liquid crystal elements and the film layer are integrated. Since the color filters are not directly formed on the film substrate, they have an effect of suppressing a defect loss of the film substrate.

According to a second aspect of the present invention, a color filter is formed on the upper surface of the second polarizing plate, covered with the protective layer having an adhesive property including the color filter, and the protective layer is bonded to the lower film substrate. By adhering the filter layer to the filter substrate with a protective layer having adhesiveness, the step of forming an adhesive layer on the protective layer can be omitted, thereby improving productivity. Having.

According to a third aspect of the present invention, a color filter is formed as an electrodeposition film on the upper surface of the second polarizing plate, and the color filter and the lower film substrate are joined by heating and pressing. When the filter layer is bonded to the film substrate, the productivity can be improved because an adhesive is not used and the step of applying the adhesive can be omitted, and further, the adhesive layer between the filter layer and the film substrate is eliminated. This has the effect that the problem of parallax can also be improved.

According to a fourth aspect of the present invention, a light-shielding film is formed as an electrodeposition film around a color filter, and the light-shielding film including the light-shielding film is heated and pressed to a lower film substrate to form the color filter and the light-shielding film. The entire structure is bonded to the lower film substrate, and has a function of increasing the bonding force between the lower film substrate and the film layer because the bonding force of the light shielding film is added.

According to a fifth aspect of the present invention, a single color filter formed on the second polarizing plate has a shape occupying an area larger than a display pixel such as a character or a graphic created inside the liquid crystal element. By making the shape of the color filter slightly larger than that of the display pixel, the display pixel is colored over the entire surface even when viewed obliquely, and has the effect of eliminating the problem of parallax.

According to a sixth aspect of the present invention, the interval between the respective patterns of the display pixels and the color filters is set to 100 μm.
The film substrate is 100 μm
Since the distance can be made as small as possible, setting the interval larger than this value has an effect of suppressing color shift due to parallax.

According to a seventh aspect of the present invention, there is provided a pair of upper and lower film substrates for enclosing a liquid crystal layer, and one of a transparent electrode and a pair of upper and lower film substrates for imparting orientation to the liquid crystal layer by a generated electric field. A liquid crystal element including a first polarizing plate arranged along the light transmitting surface for controlling transmitted light, a second polarizing plate for controlling at least transmitted light, and light transmission of any one of the second polarizing plate A filter layer in which color filters are arranged along the surface is manufactured separately, and the liquid crystal element and the film layer are integrally joined by facing the color filter to one of a pair of upper and lower film substrates. Yes, since color filters are not formed directly on the film substrate, loss of defects on the film substrate can be suppressed, and high-definition patterns can be produced even on a film substrate with low rigidity. An effect that allows for.

According to an eighth aspect of the present invention, a color filter is formed as a predetermined pattern on a transfer substrate as an electrodeposition film, and the color filter on the transfer substrate is used as a second polarizing plate. The color filter can be formed on the lower polarizing plate with high accuracy by a simple process as compared with the case where a conventional pigment dispersion method or the like is applied.

According to a ninth aspect of the present invention, a color filter is formed as a predetermined pattern on a transfer substrate, and a color filter between the color filter and the second polarizer on the transfer substrate is formed. This is a method in which pressure bonding is transferred to the upper surface of the second polarizing plate by heating and pressure bonding. When a filter layer is bonded to a film substrate, an adhesive is not used and a step of applying the adhesive can be omitted, so that productivity can be improved. It has the action of:

According to a tenth aspect of the present invention, the color filter is bonded to the lower film substrate together with the lower polarizing plate by bonding with an adhesive layer, and has the effect that only the step of coating with the adhesive layer is required. Have.

According to an eleventh aspect of the present invention, the color filter is bonded to the lower film substrate together with the second polarizing plate by heating and pressure bonding to the lower film substrate, and the filter layer is bonded to the film substrate. In this case, the step of applying the adhesive can be omitted without using an adhesive, so that there is an effect that productivity can be improved.

According to a twelfth aspect of the present invention, a light-shielding film of an electrodeposition film is formed between patterns of a color filter, and the light-shielding film including the light-shielding film is bonded to a lower film substrate by thermocompression bonding. Has the effect of enabling stable bonding to the lower film substrate by applying the bonding force of the lower film substrate.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a main part of a color liquid crystal display device of the present invention.

In FIG. 1, the color liquid crystal display device comprises a liquid crystal element L and a film layer F. The liquid crystal element L and the film layer F are manufactured in advance, and these are integrally joined. It is an assembly.

The liquid crystal element L comprises an upper film substrate 6 and a lower film substrate 7 on which an upper transparent electrode 2 and a lower transparent electrode 3 are formed and covered with protective layers 4 and 5, respectively.
The liquid crystal layer 1 is formed by sealing the liquid crystal between the surfaces on which are formed. Then, an upper polarizing plate 10 as a first polarizing plate is laminated on the upper film substrate 6 by an adhesive layer 12. That is, the difference from the conventional example of FIG. 6 is that no color filter is laminated on the upper film substrate 6.

The filter layer F is formed on a lower polarizing plate 11 provided as a second polarizing plate, with a transparent adhesive layer 13 interposed between R and R.
A color filter 8 having a fixed pattern of G and B is laminated. The color filter 8 is adhered to the lower film substrate 7 by a protective layer 9 having adhesiveness, and is integrated with the liquid crystal element L.

In the illustrated example, a reflection type liquid crystal display device is used as in the conventional example. A reflection plate 14 is fixed to the lower surface of the lower polarizing plate 11 by a transparent adhesive layer 15.

The material of each member is the same as in the conventional example. The liquid crystal layer 1 is a twisted nematic liquid crystal or a super twisted nematic liquid crystal, and the upper and lower film substrates 6, 7 are made of polycarbonate, polyether sulfone, or the like. The thickness is about 100 μm.

Here, in the manufacturing process, the liquid crystal element L and the filter layer F are separately prepared as described above. In this case, the liquid crystal element L can be manufactured by a conventionally well-known manufacturing method in accordance with the above-described process order.

On the other hand, the filter layer F is formed by a manufacturing method shown in FIG. 2 instead of the conventional pigment dispersion method. This manufacturing method is disclosed in Japanese Patent Application No. 8-31034 by the present applicant.
No. 9 is applied, and the outline is described here.

In FIG. 2A, a pattern formed with electrodes 20, 21, 22, 23 on the surface of an insulating substrate 19 made of glass or the like is prepared as a master plate 25 which can be used repeatedly. A release layer 24 is formed on the surface of each of the electrodes 20 to 23 of the master plate 25. First, as a first step, as shown in FIG. 2B, a black matrix 26 made of an electrodeposited resin is used.
Is formed by an electrodeposition method, and then, FIG.
In the order of (d), red, blue, and green colored patterns 27, 28, and 29 made of an electrodeposition resin are sequentially formed in the same manner by the electrodeposition method.

That is, in the formation of the black matrix 26 and the red, blue and green coloring patterns 27, 28 and 29 on the master plate 25 by the electrodeposition method, first, the release layer 24 formed on the surface of the electrode 23 is formed. Then, a black matrix 26 made of an electrodeposited resin having a thickness of 2 μm is formed using an acrylic anion-type electrodeposited resin bath to which a carbon black-based black pigment is added at a concentration of 30 ml / l (FIG. 2).
(B)).

Then, an electrodeposition resin having a thickness of 2 μm was formed on an exfoliation layer 24 formed on the surface of the electrode 20 for forming a red light emission pattern by using an acrylic anion electrodeposition resin bath to which an anthraquinone red pigment was added. Is formed (FIG. 3C). Similarly, on the release layer 24 on the surface of the electrode 21 for forming a blue colored pattern, a 2 μm-thick acrylic-based anion-type electrodeposited resin bath containing a phthalocyanine blue-based blue pigment was added.
An acrylic anion type in which a phthalocyanine green-based green pigment is added on the release layer 24 on the surface of the electrode layer 22 for forming a green-colored pattern, as a final step, is formed. A green colored pattern 29 made of an electrodeposited resin having a thickness of 2 μm is formed using an electrodeposited resin bath ((d) in the same figure).

Next, the master plate 25 is obtained by the above steps.
The electrodeposits of the black matrix 26 and the red, blue, and green coloring patterns 27, 28, and 29 formed thereon are separated and transferred to the upper surface of the lower polarizing plate 11 shown in FIG. Before this step, the master plate 25 is immersed in warm water to impregnate the black matrix 26 and each of the coloring patterns 27, 28, 29 with warm water.
An acrylic adhesive layer 13 is formed on the upper surface of the substrate.

That is, in this peeling transfer step, the black matrix 26 and the colored patterns 27 and 2 of each color are used.
The master plate 25 formed with 8, 29 is immersed in warm water at 50 ° C. for 1 minute, and the black matrix 26 and the colored patterns 27, 28, 29 of each color are sufficiently impregnated with warm water.

Thereafter, the master plate 25 is taken out of the warm water, and water is evaporated from the surfaces of the colored patterns 27, 28, and 29 of the respective colors, and this surface is adhered to the acrylic adhesive layer 13 of the lower polarizing plate 11. And hold until the adhesive strength is obtained. On the other hand, the inside of the coloring patterns 27, 28, and 29 of the respective colors on the side in contact with the master plate 25 is made to maintain a state in which water is still contained throughout the hold period, so that the surface of the master plate 25 Due to the water repellency of the release layer 24, the adhesive force can be made weak.

The black matrix 26 and the coloring patterns 27, 28, 29 of the respective colors, which have weakened adhesion to the master plate 25, are adhered to the acrylic adhesive layer 13 on the lower polarizing plate 11. When the film is peeled off after being pressed, it can be easily transferred to the lower polarizing plate 11, as shown in FIG. When the black matrix 26 and the colored patterns 27, 28, and 29 transferred to the surface of the lower polarizing plate 11 are heated and dried at 140 ° C. for 30 minutes, the black matrix 26 and the colored patterns 27, 28, and 29 are dried. Can have smooth surfaces with substantially the same plane, and can obtain a high-precision and high-density color pattern.

The lower polarizing plate 11 of such a color filter
In the electrodeposition film transfer to the master plate 25 after the release transfer,
Black matrix 26 and colored pattern 2 of each color
After forming 7, 28 and 29, returning to FIG. 2A, it can be repeatedly used for transferring a colored pattern,
Since photolithography is not required, it can be manufactured easily and inexpensively as compared with the conventional manufacturing method, and the productivity can be improved. Further, since the electrodes 20 to 23 of the master plate 25 can be formed with high precision in advance by a method such as patterning, the dimensional accuracy of the color filter 8 formed on the lower polarizing plate 11 can be increased, and the high-quality filter layer F can be formed. Can be obtained.

The filter layer F manufactured in the above steps is
The process proceeds to a step of integrally joining the reflection plate 14 to the liquid crystal element L on the assumption that the reflection plate 14 is adhered to the lower surface of the lower polarizing plate 11 by the transparent adhesive layer 15. In this bonding step, after the upper surface of the filter layer F is previously coated with the adhesive protective layer 9, the liquid crystal element L and the filter layer F are positioned, and the filter layer F is fixed by the protective layer 9 to the lower film substrate of the liquid crystal element L. Adhere to 7. Such a protective layer 9 for bonding the liquid crystal element L to the filter layer F fulfills both functions of protecting and bonding the color filter 8 and its pattern.
Use a curable resin or the like.

The black matrix 26 is a light-shielding film for tightening an image, and is not always necessary. Accordingly, it is possible to manufacture the electrode 24 without forming the black matrix 26 on the electrode 24 in the process of FIG. 2, and the example of FIG. 1 shows one without the black matrix 26.

Here, in the step of FIG. 2, instead of transferring the color filter 8 to the lower polarizing plate 11 side in FIGS. 7E and 7F, a black matrix 26 and coloring patterns 27, 28, 29 of each color are used. Is an electrodeposition film containing an acrylic resin as a main component, and can be bonded to the lower polarizing plate 11 by utilizing its adhesiveness. In this case, the black matrix 26 obtained in the steps up to (d) of FIG.
After heating the colored patterns 27, 28, and 29 of each color to about 70 ° C., as shown in FIG.
The master plate 25 and the lower polarizing plate 1
And 1 are pressed together. As a result, the black matrix 26, which is an electrodeposit, and the colored patterns 27, 2 of each color.
By virtue of the adhesiveness of 8, 29, the pattern of the light-shielding film 16 of the black matrix 26 and the pattern of the color filter 8 of the colored patterns 27, 28, 29 of each color can be formed on the lower polarizing plate 11, as shown in FIG. . And
Since the light-shielding film 16 is formed around the entire periphery of the color filter 8, a gap can be eliminated from the entire bonding surface with respect to the lower polarizing plate 11, thereby enabling a strong bonding with improved adhesiveness.

The lower polarizing plate 11
1 can be adhered to the lower film substrate 7 by the adhesive protective layer 9 similarly to the one shown in FIG. 1, and the liquid crystal element L and the filter element F are integrated. Thus, a color liquid crystal display device can be obtained.

In the example of FIG. 4, the filter layer F in which the color filter 8 is formed on the lower polarizing plate 11 by the process of FIG. 2 is replaced by the adhesion of the color filter 8 and the black matrix 16 instead of the adhesion by the adhesive protective layer 9. The liquid crystal layer L is joined to the lower film substrate 7 by utilizing the property.

Since the pattern of the color filter 8 is formed by the electrodeposition film of the black matrix 16 and the colored patterns 27, 28 and 29 of each color shown in FIG. 2, it is heated to about 70 ° C. similarly to the example of FIG. Then, when the color filter 8 is pressed against the lower film substrate 7, the color filter 8 can be bonded by the adhesiveness of the electrodeposited film. In this joining, the color filter 8 comes into contact with the film substrate 7 directly below as shown in the figure.

As described above, in each of the configurations shown in FIGS. 1, 3 and 4, the color filter 8 formed on the lower polarizing plate 11 in advance is used as the filter layer F, and the liquid crystal element including the liquid crystal layer 1 is formed. The liquid crystal display device can be manufactured by integrating the film layer F and the liquid crystal element L separately from the liquid crystal element L. For this reason, compared with the conventional complicated method of forming the color filter 8 by directly laminating it on one of the upper and lower film substrates 6 and 7, the production becomes much simpler.

Here, in comparison with the distance between the color filter 8 of the conventional structure and the liquid crystal layer 1 shown in FIG. 6, the distance between the color filter 8 and the liquid crystal layer 1 in each of FIGS. The distance is slightly increased. When the distance is increased, the color filter 8 and the pixels of the liquid crystal layer 1 are also separated from each other, so that a so-called parallax problem occurs in which a color shift occurs when viewed from an oblique direction in a normal case. However, since the lower film substrate 7 interposed between the color filter 8 and the liquid crystal layer 1 is much thinner than a glass substrate, the increase in distance can be suppressed, and such a problem of parallax does not occur.

FIG. 5 is a schematic plan view of a main part showing a configuration in which a color filter is made larger than a pixel.

For example, in a mobile phone or the like, not only display by small pixels but also characters and symbols representing various functions are included in the liquid crystal element as relatively large pixels.

Therefore, if the color filter 8 formed on the lower polarizing plate 11 is made larger than the pixel 18 of the character representing the number "1" as shown in FIG. It can be displayed as colored light by the color filter 8 as “1”. If the other various pixels are made larger than these pixels by associating with the color filters 8 of appropriate colors for each display, each pixel can be illuminated and displayed in an individual color. it can.

If the color filter 8 is formed on the lower polarizing plate 11 so as to occupy an area larger than the pixel 18, the display of characters, figures, and the like can be easily colored and displayed.

In FIG. 5, the interval between the respective arrangement patterns of the pixels 18 and the color filters 8 is 100 μm.
It is preferable to set m or more to prevent occurrence of color shift due to parallax.

That is, in each of the configurations shown in FIGS. 1, 3 and 4, the lower film substrate 7 interposed between the color filter 8 and the liquid crystal layer 1 can be thinned to at least about 100 μm. On the other hand, when the angle with respect to the normal line of the upper film substrate 6 is defined as the viewing angle, if a good color display is obtained in a range where the viewing angle is within 45 degrees, there is a problem in the actual use of the color liquid crystal display device. It is not. However, the distance between the color filter 8 and the liquid crystal layer 1 is 100 μm.
m, the interval between the color filters 8 is 10
When the thickness is 0 μm or less, a pixel viewed from a position at a viewing angle of 45 degrees causes color mixture with an adjacent pattern, and does not provide good color display.

On the other hand, if the distance between the respective arrangement patterns of the pixels 18 and the color filters 8 is set to 100 μm or more, even if the thickness of the lower filter substrate 7 is about 100 μm, the influence of parallax can be avoided. Color shift can be prevented.

[0058]

According to the first aspect of the present invention, since the color filter is not formed directly on the film substrate, it is possible to suppress the loss of the film substrate due to the defective production of the color filter. In addition, it is possible to provide a color liquid crystal display device with high definition and high productivity.

According to the second aspect of the present invention, the step of forming the adhesive layer on the protective layer can be omitted, and the productivity can be improved, so that a color liquid crystal display device can be provided at low cost.

According to the third aspect of the present invention, when the filter layer is bonded to the film substrate, the step of applying the filter layer can be omitted without using an adhesive. Since the problem of parallax can be solved by eliminating the adhesive layer between them, a color liquid crystal display device which is inexpensive and has good display performance can be provided.

According to the fourth aspect of the present invention, since the joining force by the light shielding film is added, the joining force between the lower film substrate and the film layer can be increased, and the joining between the liquid crystal element and the filter layer becomes more reliable. A highly reliable color liquid crystal display device can be provided.

According to the fifth aspect of the present invention, by making the shape of the color filter slightly larger than the display pixel, the display pixel is colored over the entire surface even when viewed obliquely, and the problem of parallax is eliminated. A color liquid crystal display device colored with a color can be easily provided.

According to the sixth aspect of the present invention, color shift due to parallax can be suppressed, so that a color liquid crystal display device having good display performance can be provided.

According to the seventh aspect of the present invention, since the color filter is not formed directly on the film substrate, it is possible to suppress the loss of defects of the film substrate, etc., and to achieve high definition and high mass productivity even if the film substrate has low rigidity. A color liquid crystal display device can be provided.

According to the eighth aspect of the present invention, a color filter can be formed on a lower polarizing plate with high accuracy by a simple process as compared with a case where a conventional pigment dispersion method or the like is applied. A display device can be provided at low cost.

According to the ninth aspect of the present invention, when the filter layer is adhered to the film substrate, the step of applying the adhesive without using an adhesive can be omitted, and the productivity can be improved. Can be provided.

According to the tenth aspect of the present invention, it is only necessary to add only the step of coating with an adhesive layer, so that the manufacturing process can be further simplified, and a color liquid crystal display device can be provided easily and inexpensively.

According to the eleventh aspect of the present invention, when the filter layer is bonded to the film substrate, the step of applying the filter layer can be omitted without using an adhesive, and productivity can be improved. Can be provided.

According to the twelfth aspect of the present invention, the liquid crystal layer and the filter layer can be assembled more reliably because the bonding strength of the light-shielding film is applied to the lower film substrate so that the liquid crystal layer and the filter layer can be more reliably assembled. A color liquid crystal display device can be provided.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a main part of a color liquid crystal display device of the present invention.

FIG. 2 is a diagram illustrating a process of forming a color filter on a lower polarizing plate by transfer.

FIG. 3 is a longitudinal sectional view of a main part showing another example of the color liquid crystal display device of the present invention.

FIG. 4 is a longitudinal sectional view of a main part showing still another example of the color liquid crystal display device of the present invention.

FIG. 5 is a schematic plan view of a main part showing a configuration in which a color filter is larger than a pixel;

FIG. 6 is a longitudinal sectional view showing a main part of a conventional color liquid crystal display device.

[Description of Signs] 1 Liquid crystal layer 2 Upper transparent electrode 3 Lower transparent electrode 4 Protective layer 5 Protective layer 6 Upper film substrate 7 Lower film substrate 8 Color filter 9 Protective layer 10 Upper polarizing plate (first polarizing plate) 11 Lower polarized light Plate (second polarizing plate) 12 Adhesive layer 13 Adhesive layer 14 Reflector 15 Adhesive layer 16 Light shielding film 17 Liquid crystal display element 18 Pixel 19 Insulating substrate 20, 21, 22, 23 Electrode 24 Peeling layer 25 Master plate 26 Black matrix 27 Red coloring pattern 28 Blue coloring pattern 29 Green coloring pattern

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toyoichi Yoshino 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (12)

[Claims] 1. A liquid crystal display device comprising: a pair of upper and lower film substrates enclosing a liquid crystal layer, and a transparent electrode for imparting orientation to the liquid crystal layer by an electric field generated, and a light transmitting surface of one of the upper and lower pair of film substrates. A liquid crystal element that includes a first polarizing plate that controls the transmitted light, a second polarizing plate that controls at least the transmitted light, and a color filter that is arranged along one of the light transmitting surfaces of the second polarizing plate. A color liquid crystal comprising a filter layer disposed thereon, and a liquid crystal element and a film layer which are integrally joined with the surface of the second polarizing plate on which the color filter is disposed and the film substrate facing each other. Display device. 2. A color filter is formed on an upper surface of a second polarizing plate, covered with a protective layer having adhesiveness including a color filter, and the protective layer is adhered to a lower film substrate. The color liquid crystal display device according to claim 1. 3. A color filter is formed as an electrodeposition film on the upper surface of the second polarizing plate, and the color filter and the lower film substrate are bonded by heating and pressure bonding. 2. The color liquid crystal display device according to 1. 4. A light-shielding film is formed as an electrodeposition film around the color filter, and the entirety of the color filter and the light-shielding film is bonded to the lower film substrate by heating and pressing between the lower film substrate and the lower film substrate including the light-shielding film. 4. The color liquid crystal display device according to claim 3, wherein: 5. The liquid crystal device according to claim 1, wherein the single color filter formed on the second polarizing plate has a shape occupying an area larger than a display pixel such as a character or a graphic created inside the liquid crystal element. 5. The color liquid crystal display device according to any one of items 1 to 4. 6. The color liquid crystal display device according to claim 5, wherein an interval between each pattern of the display pixel and the color filter is set to 100 μm or more. 7. A liquid crystal display device comprising a pair of upper and lower film substrates enclosing a liquid crystal layer, and a transparent electrode for imparting orientation to the liquid crystal layer by an electric field generated and a light transmitting surface of one of the upper and lower film substrates. A liquid crystal element that includes a first polarizing plate that controls the transmitted light, a second polarizing plate that controls at least the transmitted light, and a color filter that is arranged along one of the light transmitting surfaces of the second polarizing plate. A color liquid crystal display device characterized in that the arranged filter layer is manufactured separately, and the color filter is opposed to one of the pair of upper and lower film substrates, and these liquid crystal elements and the film layer are integrally joined. Manufacturing method. 8. A color filter is formed as an electrodeposition film on a transfer substrate in a predetermined pattern, and the color filter on the transfer substrate is adhered to the upper surface of the second polarizing plate for transfer. 8. The method for manufacturing a color liquid crystal display device according to claim 7, wherein: 9. A color filter is formed as a predetermined pattern on a substrate for transfer, and the second polarized light is heated and pressed between the color filter on the substrate for transfer and the second polarizing plate. 8. The method for manufacturing a color liquid crystal display device according to claim 7, wherein the color liquid crystal display device is pressure-transferred onto the upper surface of the plate. 10. The method according to claim 8, wherein the color filter is bonded to the lower film substrate together with the second polarizing plate by bonding with an adhesive layer. 11. The method for manufacturing a color liquid crystal display device according to claim 9, wherein the color filter is bonded to the lower film substrate together with the second polarizing plate by heat compression bonding with the lower film substrate. 12. A light-shielding film of an electrodeposition film is formed between patterns of a color filter, and the light-shielding film including the light-shielding film is bonded to a lower film substrate by heat compression.
2. A method for manufacturing a color liquid crystal display device according to item 1.