JPH1124062A - Color liquid crystal display device and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily supply a color liquid crystal display device performing display with color tone demanded by market by providing a color filter between a display module and an outer packaging case. SOLUTION: This color liquid crystal display device is provided with a liquid crystal display panel 3 having a scattered liquid crystal layer and a reflecting layer provided on the back of the scattered liquid crystal layer, the display module housing a circuit block 7 and a battery 9 in a supporting frame member 4, the outer packaging case 1 having a transparent aperture part housing the display module, and the color filter 2 provided between the display module and the case 1. As to this manufacture; a display frame is put on the case 1, the filter 2 is put on the display frame, and the display module is fixed to the case 1 through a spring member, so that the color liquid crystal display device can be easily manufactured. Display with color range as wide as possible from the bright and simple color to the color rich in variation can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to ornaments, watches,
The present invention relates to a color liquid crystal display device used for calculators, radios, small portable devices, and displays. More specifically, the present invention relates to a structure capable of easily supplying a color liquid crystal display device that displays a color tone required by the market, and a structure capable of quickly responding to changing fashion, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, there is a light-scattering type liquid crystal display device utilizing light scattering by liquid crystal without using a polarizing plate as represented by a phase transition mode and a polymer dispersion mode. According to these light scattering modes, light can be effectively used without causing absorption loss of light by the polarizing plate, so that bright display can be achieved.

[0003] For example, US Pat.
688900 discloses a polymer dispersion mode having a structure in which liquid crystal droplets are arranged in a polymer.
Alternatively, JP-A-1-198725 discloses a structure in which a liquid crystal forms a continuous layer, and a polymer material is distributed in a three-dimensional network structure in the continuous layer.

On the other hand, as a means for colorizing such a light-scattering type liquid crystal display device, as disclosed in JP-A-50-49994, a colored transmission layer (ie, a color filter) is formed inside a substrate. In addition, a configuration in which a mirror layer is formed behind the scattering type liquid crystal layer is known. When the scattering type liquid crystal layer is in the scattering state, the incident white light is colored by the color filter, scattered by the scattering type liquid crystal layer, reflected by the mirror layer, and again scattered by the scattering type liquid crystal layer. . As a result, colored bright scattered light is obtained.
On the other hand, when the scattering type liquid crystal layer is in a transparent state, the incident white light is colored by the color filter, travels straight without scattering in the scattering type liquid crystal layer, and is specularly reflected in the mirror layer. At positions where the line of sight is deviated from the specularly reflected light, it is displayed as black. In this way,
A bright mono-color display was realized.

[0005]

SUMMARY OF THE INVENTION As described above,
A light scattering type liquid crystal display device using a dynamic scattering mode (DSM) used as a light scattering type liquid crystal layer disclosed in US Pat.
The current consumption is 10 to 100 times that of the N mode. Therefore, it has not been installed in small portable devices such as watches that particularly value battery life.

The phase transition mode, which is another light scattering type liquid crystal layer, sometimes uses thermal turbidity as a scattering state. The thermal turbidity significantly deteriorates due to the influence of external stress, thermal cycle, and the like. Therefore, it was not mounted on a small portable device and put to practical use.

Further, US Pat. No. 4,350,047, US Pat.
In the polymer dispersion mode having a structure in which liquid crystal droplets are arranged in a polymer disclosed in Japanese Patent No. 688900, a driving voltage of several tens of volts is required to obtain a high transparent state due to the structure. . Therefore, it was not mounted on small portable devices such as watches that emphasize battery life.

In recent years, the polymer network liquid crystal disclosed in Japanese Patent Application Laid-Open No. 1-187725 has been attracting attention because it has properties to solve the above-mentioned problems. However, when manufacturing a light-scattering type liquid crystal display element combining the polymer network liquid crystal and the color-forming means disclosed in Japanese Patent Application Laid-Open No. 50-49994, irradiation with a color filter and a mirror layer is performed in a phase separation step by irradiation with ultraviolet rays. There is a problem in manufacturing that ultraviolet rays are absorbed and ultraviolet light intensity sufficient to realize good characteristics cannot be obtained.

In recent years, in a rich era full of objects, the color needs of fashion have changed from simple colors to colors with a wide variety of colors. To meet such market needs, there is a demand for a display device that displays in as wide a variety of colors as possible.
This is particularly noticeable when mounted on small portable devices such as watches that emphasize fashion. JP-A-50-4999
The color conversion means disclosed in No. 4 has the following problems in response to the above needs.

One is that increasing the number of colors increases the manufacturing cost. The cause is due to the inner surface color filter. In other words, the colors currently in practical use as inner color filters are only three colors of red, green and blue, and when other colors are used, it becomes necessary from the development of materials including dyes, pigments and the like. . For example, it is a new resist or an electrodeposition liquid. In addition to the development cost, the scale merit effect depending on the production quantity cannot be exhibited, and the material becomes expensive.

Secondly, it is difficult to timely produce and supply in accordance with market trends. In other words, it is impossible to predict the fashionable color in advance and to proceed with the development and production because it involves risks. Eventually, it will be produced and supplied after the epidemic, which can be a time lapse.

Further, there is a risk of a manufacturer who sells a portable device equipped with a display device of a specific color.
That is, once the fashion of a particular color is over, there is a danger that the commercial value of the portable device will be lost and unsold. In order to avoid such risks, manufacturers are hesitant in planning products that require a display device to be fashionable. Therefore, Japanese Patent Laid-Open No. 50-49
The 994 colorization technology cannot be used.

Another subject is disclosed in Japanese Patent Laid-Open No. 50-49.
In the structure of 994, a backlight which is generally used for illumination when external light is dark cannot be used. The reason is that the liquid crystal display panel cannot transmit the light of the backlight even if the backlight is placed behind the liquid crystal display panel because there is a mirror layer inside the liquid crystal display panel. For this reason, it has only been used as a so-called reflection type liquid crystal display device used when external light is bright.

[0014]

In order to solve the above-mentioned problems, a color liquid crystal display device according to the present invention comprises a liquid crystal display panel having a scattering type liquid crystal layer and a reflection layer provided behind the scattering type liquid crystal layer, and a circuit. The display module includes a display module in which the block and the battery are stored in a support frame member, an outer case having a transparent opening for storing the display module, and a color filter provided between the display module and the outer case. By arranging the color filters in such a configuration, an epoch-making color liquid crystal display device that solves the above-described problem has been realized.

The scattering type liquid crystal layer used in the present invention is a polymer network liquid crystal layer having a structure in which a liquid crystal material forms a continuous layer, and a photocurable resin having a three-dimensional network structure is formed in the continuous layer. is there. In this case, the ratio of the liquid crystal material to the photocurable resin is preferably in the range of 70 to 99%. When the voltage application level is high, the light transmission state occurs, and when the voltage application level is lower, the light transmission state occurs. On the other hand, by changing the vertical alignment treatment or horizontal alignment treatment, the mixing ratio of the chiral agent, or the light irradiation conditions, conversely, when the voltage applied level is high, the state becomes a scattering state, and when the voltage applied level is lower, the state becomes a light transmitting state. Is also good.

The liquid crystal display panel used in the present invention may include a scattering type liquid crystal layer sandwiched by a substrate on which a transparent electrode is formed, and a reflection layer provided behind the scattering type liquid crystal layer. The transparent electrode may be a pattern capable of displaying a character, a seven-segment display, or a pattern capable of displaying a dot matrix, as long as it is patterned on the entire surface or a part of the substrate. Further, the reflection layer may also serve as the transparent electrode. In the pattern, an active element such as a diode or a transistor may be formed for each pixel. As the substrate, a glass or flexible plastic substrate can be used. The reflective layer should have a highly reflective mirror surface,
In particular, it is necessary that scattering is small. It is desirable to include at least one of metals such as aluminum, silver, nickel, chromium, palladium, rhodium, alloys thereof, and oxides thereof.

The display module used in the present invention contains a battery, a liquid crystal display panel, and all circuit blocks including a conductive member and an illumination light source in a support frame member integrally formed of synthetic resin. This is a module having a general function. The display in this state is a monochrome display and is not colored with a specific color.

The color filter used in the present invention comprises:
It may be a material such as a colored film, a resin substrate, or glass. In particular, a material that can minimize the decrease in transmittance and scattering by coloring is desirable. A so-called interference filter such as a dichroic mirror or a cholesteric liquid crystal polymer may be used.

The display frame used in the present invention may be used only when it is necessary for positioning when the outer case and the display module are integrated, or when it is necessary to correct the shift of the display parting. A display frame is arranged between the outer case and the color filter. Further, the color filter may be integrated with the display frame.

The color liquid crystal display device of the present invention can be easily manufactured by a manufacturing method in which a display frame is dropped into an outer case, a color filter is dropped from above, and a display module is fixed to the outer case via a spring member. .

The color filter used in the present invention may be integrated with the outer case, or may be detachably installed outside the transparent opening of the outer case. Furthermore, when a special effect is required for a color filter, a function that has either a function of changing the transmitted color with a change in temperature, a function of reproducing a hologram, or a function of changing the color by absorbing light. A color filter may be used.

Further, the liquid crystal display panel has a structure including a light source for allowing light for illumination to enter from the side surface of the substrate. A light condensing means for efficiently causing the light of the light source to enter the side surface of the substrate above the reflective layer may be provided. Further, the light source may be between the substrate and the reflective layer or in the substrate.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below. (Embodiment 1) FIG. 1 is a schematic sectional view of a color liquid crystal display device of the present invention. FIG. 2 is a schematic cross-sectional view of the liquid crystal display panel.

Hereinafter, the liquid crystal display panel 3 will be described. Hard glass having a thickness of 0.4 mm was used for the substrates 15 and 20. A reflective layer 19 is formed on a substrate 20 by depositing aluminum by a sputtering apparatus and adjusting the film thickness so that the light reflectance in the visible light region is in the range of 80 to 90%. Further, a transparent electrode 18 is formed via an insulating film 22. The insulating film 22 is made of a material having a spectral transmittance of more than 91% and having high transparency in the visible light region (V.259-PA manufactured by Nippon Steel Chemical Co., Ltd.) so as not to attenuate the spectral reflectance of the reflective layer 19. ). The thickness of the insulating film 22 was about 2 μm, and was formed by a spinner. Further, a transparent electrode 16 is formed on the substrate 15. In Example 1, a transparent conductive film made of an In2O3-SnO2 film (hereinafter, referred to as an ITO film) formed by a sputtering method or a vacuum evaporation method was used by patterning by photolithography. The pattern was designed to be able to display a character consisting of 7 segments.
Note that a SnO2 film may be used in addition to the ITO film.
After an insulating film was further formed thereon, a seal was provided to manufacture an empty cell. The cell gap was adjusted to 8 μm.

The scattering type liquid crystal layer 17 is prepared by uniformly mixing and dissolving a polymer resin such as an acrylate monomer which undergoes a cross-linking reaction and polymerization with ultraviolet (UV), a nematic liquid crystal having positive dielectric anisotropy, and an ultraviolet curing initiator. The mixed solution is injected into an empty cell, only the polymer resin is cured by exposure to ultraviolet light, and a nematic liquid crystal having a positive dielectric anisotropy is phase-separated.

The mixing ratio of the polymer resin and the nematic liquid crystal is 8: 2 to 1: 9. It should be noted that a lower voltage is easier to achieve in the liquid crystal continuous phase structure of the polymer network than in the independent liquid crystal droplet structure. Therefore, the range of 4: 6 to 1: 9 is more preferable.

More specifically, "PNM" manufactured by Roddick Co., Ltd.
-156 "was used as a liquid crystal material and vacuum-injected into an empty cell while maintaining a temperature of 30 ° C. While maintaining this at a temperature of 25.5 ° C., ultraviolet light of 75 mW / cm 2 was irradiated for 20 seconds with a metal halide lamp to scatter the liquid crystal layer 17.
Was produced. At this time, 350
Use a filter that absorbs wavelengths below nm. When starting irradiation of ultraviolet rays, it is important that irradiation can be instantaneously started using a shutter from a lamp capable of emitting 75 mW / square centimeter intensity in advance. Furthermore, the temperature during vacuum injection and the temperature during ultraviolet irradiation need to be higher than the phase transition temperature of the liquid crystal material. In particular, the temperature at the time of ultraviolet irradiation is preferably set to be 1.5 ° C. higher than the phase transition temperature.

When the scattering type liquid crystal layer 17 of the liquid crystal display panel 3 was observed using a scanning electron microscope, a three-dimensional network structure composed of a polymer was confirmed.
In addition, electro-optical characteristics were measured with a Canon photometer. The reflectance when the reflectance is saturated with the increase in the applied voltage is set to 100%, the applied voltage indicating a 90% reflectance is Vsa, and the applied voltage indicating a 10% reflectance is Vt.
h. As a result of the measurement, the current consumption at Vth 1.2 V Vsa 2.6 V Vsa was 0.5 μΑ / cm 2.

Here, the reflection layer 19 is not limited to aluminum, but may be a metal such as silver, nickel, chromium, palladium, an alloy thereof, or an oxide thereof. As an example of the alloy, there is a nichrome alloy of 80% Ni and 20% Cr. Further, a dielectric film or the like may be used.

The liquid crystal display panel 3 manufactured as described above,
The display module of the wristwatch was manufactured by storing the clock circuit block 7 and the battery 9 in the support frame member 4. The display appearance was evaluated indoors under the illumination of a ceiling fluorescent lamp. The time could be represented by a black segment display on a white background. The segment display unit reflects the incident white light 11 as the specularly reflected light 12, so that if the line of sight of the observer 14 is deviated from the specularly reflected light 12, the segment display looks black. Further, since the incident white light 11 is reflected as the scattered light 13, the background can be observed as bright white.

Next, the color filter 2
And the display module is connected to the spring member 10.
Assembled by the manufacturing method of fixing to the outer case via
Rosco made by Rasco as color filter 2
Lux sheet 100 color set can be used. For example, 1
The 19th Fire color selected from 00 colors was used.

The timepiece thus completed was evaluated under a fluorescent lamp. It was able to express the time with a black segment display on a bright red background. The driving voltage is 3
V and the current consumption is 0.32μ for the LCD panel alone
Was Α. Using CR2025 type lithium battery,
A battery life of three years or more can be realized as a wristwatch.

Next, the same type of exterior case and display module were prepared, and the color filter 2 was selected at any time from a set of 100 colors of Roscoux sheet manufactured by Rasco, and assembled similarly. The completed wristwatch was completed in a blink of an eye with 100 different display colors, and it was confirmed that the variety of colors was more abundant than that of the conventional method, and that it could be produced quickly and at low cost.

Comparative Example 1 In the configuration of Example 1, the liquid crystal display panel was replaced with a reflection type positive TN liquid crystal display panel.
Similarly, a display module of a wristwatch was manufactured by storing the clock circuit block 7 and the battery 9 in the support frame member 4. The display appearance of the display module of Example 1 and the display module of Comparative Example 1 were compared in a room under ceiling fluorescent lamp illumination. As a result, the white background portion of the display module of Example 1 was noticeably brighter. The display module of Comparative Example 1 appeared on a dark gray background. This difference in brightness is attributable to the use or non-use of the polarizing plate, and can be estimated to be theoretically about two to three times.

Further, in the display module of Comparative Example 1,
In the same manner as in Example 1, an outer case was prepared, and the color filter was a Roscoux sheet 100 manufactured by Rasco.
I chose it from the color set at any time and assembled it in the same way. The completed wristwatches are 100 kinds with different display colors. However, when observing the display part, the sample using the dark color filter is dark, the contrast between the background and the segment part is low, and the visibility is very poor. Only a small number of samples using a light color for the color filter provided a certain degree of visibility. Therefore, the comparative example 1 cannot enrich the color variations, and does not function effectively in differentiating small portable devices such as watches that emphasize fashionability in accordance with market needs.

(Embodiment 2) A liquid crystal display panel 3, a clock circuit block 7, and a light source 6 manufactured in the same manner as in Embodiment 1.
The display module of the wristwatch was manufactured by storing the battery, the conductive member 8 and the battery 9 in the support frame member 4. This display module
When the external light is dark, this is an internally illuminated display module that emits light from a built-in light source and guides the light into a substrate of a liquid crystal display panel for display.

The display state will be described with reference to FIG. Light emitted from the light source 6 is incident on the side surface between the substrate 15 and the reflective layer 19. With respect to the incident light, light having an angle exceeding the critical angle at the upper interface of the substrate 15 is confined between the reflective layer 19 and guided. The guided light is guided as it is when the scattering type liquid crystal layer is in a transparent state. Therefore, the observer 14 does not feel light but feels dark. However, in the scattering state, the light being guided is scattered, and scattered light having an angle smaller than the critical angle leaks out of the substrate 15. The leaked light becomes scattered light 13 and the observer 14 feels bright.

As the light source 6, when the display module is incorporated in the outer case as in the first embodiment, it is desirable to use a white light source because it is desired to use color filters in as many colors as possible. In Example 2, Nichia Corporation
A white light source was obtained by combining a blue chip type LED-NSCB100 manufactured by Nippon Kayaku and a yellow light-emitting phosphor NP-204 manufactured by Nichia Corporation. Further, a white light source in which a blue LED and a yellow light emitting phosphor are integrated may be used, and a krypton lamp or a filament lamp may be used. When the color of the color filter is fixed, a single-color LED may be used.

Next, a description will be given, with reference to FIG. 9, of a light incident means for inputting light between the light source 6 and the liquid crystal display panel 3. FIG. The light source 6 is mounted on a printed circuit board and emits blue light upward. This light is reflected by the reflecting surface formed by the slope of the support frame member 4 and irradiates the yellow light emitting phosphor 23. The yellow light emitting phosphor 23 is in optical contact with the side surface of the liquid crystal display panel 3. Therefore, the white light emitted by the yellow light emitting phosphor 23 is easily guided into the substrate of the liquid crystal display panel 3. In addition, when a single color LED other than blue is used, the yellow light emitting phosphor 23 is not required, so that it is not attached to the liquid crystal display panel. With the above configuration, light could be efficiently incident on the liquid crystal display panel.

The above-described display module of the internally illuminated type is used in the first embodiment.
Prepare an exterior case in the same way as
Assembled in the same manner by selecting from a set of 100 colors of Roscolux sheet manufactured by sco. The completed wristwatches are 100 kinds with different display colors. When the outside light was bright, the display appearance was the same as in Example 1. Further, when external light was dark, a built-in light source was made to emit light to evaluate display appearance. It reproduced the colors of the color filters faithfully and was the same as when the outside light was bright. The time could be represented by a black segment display on the background of the color of the bright color filter. Therefore, even in the case where external light is dark, which is impossible with the conventional method, it is possible to display a wide variety of colors, which is effective for differentiating small portable devices such as watches that emphasize fashion.

(Embodiment 3) In this embodiment, a liquid crystal display panel manufactured by the following method is used, and other configurations are the same as those of the second embodiment. The liquid crystal display panel is composed of 3 dispersed in cholesteric nematic phase transition type liquid crystal.
It has a polymer-stabilized phase-change liquid crystal layer having a structure having a planar texture or a focal conic texture stabilized by a three-dimensional network photocurable resin.
A mode having a planar texture and not taking a focal conic texture may be used.

95.7% by weight of a chlorine-based nematic liquid crystal TL215 (manufactured by Merck), 2.3% by weight of a chiral agent S811 (manufactured by Merck), 1.9% by weight of a polymer resin precursor 2.7-diacryloyloxyfluorene %, And a mixture of 0.1% by weight of a polymerization initiator benzoin methyl ether was vacuum-injected into the same empty cell as in Example 1 which was subjected to horizontal alignment treatment in an isotropic state. While maintaining the cell at 21 ° C.,
Irradiate with a metal halide lamp using a filter that transmits ultraviolet light of 400 nm to 400 nm at an irradiation intensity of 0.1 mW / cm 2 for 60 minutes, and then irradiate at an intensity of 40 mW / cm 2 for 10 seconds to obtain a polymer resin precursor. Was cured.

When the scattering type liquid crystal layer of the liquid crystal display panel thus obtained was observed using a scanning electron microscope, a three-dimensional network structure composed of a polymer was confirmed. In addition, electro-optical characteristics were measured with a Canon photometer. The absolute reflectance when no voltage is applied is T0, the relative reflectance when no voltage is applied is 100%, and the reflectance when the reflectance decreases and saturates with an increase in applied voltage is 0%.
The applied voltage indicating the% reflectance is Vsa. Also, 90
The applied voltage indicating the% reflectance is Vth. As a result of the measurement, the current consumption at Vth 4 V Vsa 5.9 V Vsa was 0.98 μ０．９ / cm 2.

The produced liquid crystal display panel was mounted on a wristwatch in the same manner as in Example 2, and the display appearance was evaluated in a room under ceiling fluorescent lamp illumination. It showed a segment display of the colors of a bright color filter on a black background. Further, when external light was dark, a built-in light source was made to emit light to evaluate display appearance. It reproduced the color of the color filter faithfully and was the same as when the external light was bright. The time could be represented by a segment display of the color of the bright color filter on a black background. The segment display was bright and similar to a direct-drive LED watch. This display was in harmony with the luxury design and could enhance the value of the watch as an ornament or craft. The driving voltage was as low as 6 V, and the current consumption was 0.64 μ４ for the liquid crystal display panel alone. Using a CR2025 type lithium battery, a battery life of two years or more was realized as a wristwatch. Therefore, it is possible to display a variety of colors, which is impossible with the conventional method, and it is effective for differentiating small portable devices such as watches that emphasize fashion.

Example 4 The display module manufactured in Example 2 was assembled in a configuration as shown in FIG. First,
The display frame 21 shown in FIG.
, The color filter 2 is dropped thereon, and the display module is fixed to the outer case 1 via the spring member 10. The display frame 21 determines the position and size of the parting-off of the liquid crystal display panel and is an important part in design. Logo marks and various marks are printed. Here, what was printed on the acrylic board which punched out the parting was used.

FIGS. 3 and 4 show the color filter 2.
A dielectric interference filter having a spectral transmittance as shown in FIG. 0.3 mm thick glass on which a dielectric multilayer thin film was vacuum-deposited was used. Materials used for the dielectric thin film include SiO2, MgF2, and Na for a low refractive index translucent dielectric thin film.
3AlF6 and the like, and TiO2, ZrO2, Ta2O5, ZnS, ZnS as high refractive index translucent dielectric thin films.
e, ZnTe, Si, Ge, Y2O3, Al2O3 and the like are used. Required reflection wavelength band, transmission wavelength band,
The dielectric material, the film thickness, and the number of layers are set according to the reflectance and the transmittance. Further, these dielectric thin films can be easily formed by a vacuum evaporation method, a sputtering method, or the like.

The digital watch assembled by the above method has the same effects as those of the first and second embodiments. Further, since the dielectric multilayer thin film is used for the color filter, the color filter is bright, and a change in hue depending on the viewing angle can be obtained. When the light source for lighting was turned on, the display frame other than the liquid crystal display panel was illuminated, and the portions other than the color filter were illuminated in white to enhance the design of the display frame.

It was also confirmed that a similar effect could be obtained by using a color acrylic plate in which a display frame and a color filter were integrated. Further, the same applies when the transparent opening of the outer case is integrated with the display frame.

Example 5 The display module manufactured in Example 2 was assembled in a configuration as shown in FIG. First,
The transparent opening of the outer case 1 has a structure in which a display frame and a color filter are integrated. The display module was assembled to the outer case 1 by a manufacturing method in which the display module was fixed to the outer case 1 via a spring member 10. The transparent opening of the outer case 1 determines the position and size of the parting-off of the liquid crystal display panel and is an important part in the design, and a logo mark and various marks are printed thereon. Here, the cover glass was printed with a parting mark, a logo mark, various marks, and the like, and processed by dyeing to transmit an arbitrary color.

The digital watch assembled by the above method has the same effects as those of the first and second embodiments. Further, when the illumination light source was turned on, the entire transparent opening of the outer case 1 other than the liquid crystal display panel was illuminated, thereby enhancing the design.

(Embodiment 6) The display module manufactured in Embodiment 2 was assembled in a configuration as shown in FIG. First,
The transparent opening of the outer case 1 has a structure integrated with the display frame. The display module was assembled to the outer case 1 by a manufacturing method in which the display module was fixed to the outer case 1 via a spring member 10. The transparent opening of the outer case 1 determines the position and size of the parting-off of the liquid crystal display panel and is an important part in the design, and a logo mark and various marks are printed thereon. Here, a cover glass in which a parting logo, a logo mark, various marks, and the like are printed is used. For the color filter 2, an adhesive sheet dyed with an arbitrary color was attached to the outside of the transparent opening of the outer case 1. Further, the color filter 2 may be configured to be detachably fitted to the outside of the transparent opening of the outer case 1 with a colored resin.

The digital watch assembled by the above method has the same effects as those of the first and second embodiments. Further, even if the color filter is manufactured in various colors in advance, the cost is small and there is no problem. Furthermore, in this method, since the color filter is detachable, the color can be changed by the user himself. Therefore, the color of the display unit can be changed according to the season and the user's mood on the day, which is effective for differentiating small portable devices such as watches that emphasize fashion.

(Example 7) The display module manufactured in Example 2 was assembled in a configuration as shown in FIG. First,
The display frame 21 shown in FIG.
, The color filter 2 is dropped thereon, and the display module is fixed to the outer case 1 via the spring member 10. The display frame 21 determines the position and size of the parting-off of the liquid crystal display panel, and is an important part in design, and is printed with a logo mark, various marks, and the like. Here, what was printed on the acrylic board which punched out the parting was used.

When a special effect is required for the color filter, the color filter may have one of a function of changing a transmitted color with a change in temperature, a function of reproducing a hologram, and a function of changing a color by absorbing light. A functional color filter having the following.

As an example of a functional color filter whose transmission color changes with a change in temperature, an inorganic thermal ink,
Organic thermometric inks, thermochromic liquid crystal inks and the like can be used. As a specific example, a heavy metal iodide compound is generally used as the inorganic thermosensitive ink. An inorganic thermosensitive ink composed of an iodide compound of Hg, Ag, and Cu reversibly changes color between orange and red at a color change temperature of 40 ° C. The organic thermosensitive ink has a dye structure at the time of color development and has a leuco form at the time of colorlessness. That is, it occurs by an electron transfer mechanism based on thermal equilibrium between a polar compound of an electron donor and an electron acceptor. Specifically, 1 g of crystal violet and dodecyl gallate 5
g and myristian alcohol 10 g are colorless below 38 ° C. and purple above 38 ° C. As the thermochromic liquid crystal ink, the temperature dependence of the selective reflection wavelength of the cholesteric liquid crystal is used. Cholesteric liquid crystal molecules have a layer structure and are spirally rotated. The pitch of one rotation expands and contracts depending on the temperature. Normally shrinks due to an increase in temperature, and the reflected light at that time is red, orange, yellow,
The color changes from green to blue to indigo to purple.

An example of a functional color filter for reproducing a hologram is a Lippmann hologram. The Lippmann hologram, also called a volume hologram, reproduces a three-dimensional image in a specific color by black reflection under irradiation of white light. In the liquid crystal display panel of this example, reproduction is performed in green, and magenta, which is a complementary color thereof, is displayed as a transparent color.

As an example of a functional color filter whose color changes due to light absorption, as an example of a function accompanied by a change in the absorption spectrum stimulated by violet light energy in the ultraviolet to visible light short wavelength region, a phtochromic mechanism Examples include photoisomerization, photodissociation, photooxidation and reduction, and transition to an excited state. A typical example of photoisomerization includes trans and cis conversion of azobenzene. The trans type is more energetically stable than the cis type. When the trans-form is irradiated with ultraviolet light in the short wavelength range from ultraviolet to visible light, it is converted to the cis-form. When the light weakens, the cis-type returns to the transformer-type due to thermal motion. The trans-type and the cis-type are observed as color changes due to the difference in absorption spectrum. The phtochromic color filter was manufactured by dispersing phtochromic powder in a transparent resin. This phtochromic color filter was reversibly discolored to white indoors and blue under direct sunlight in the outdoors.

The digital watch assembled by the above method has the same effects as those of the first and second embodiments. In addition, since this product is modulated by the various functions described above, a new display can be provided instead of a simple display as in the related art. When this is used for a display portion of a watch or a portable device, new value can be given as a decoration or a craft.

[0059]

The color liquid crystal display device of the present invention can display a wide range of colors from bright and simple colors to various colors. Especially when it is mounted on small portable devices such as watches that emphasize fashion,
Especially effective. Further, even a small amount of production does not cause an increase in manufacturing cost, and the number of types of colors can be increased.
In addition, it is possible to produce and supply in a timely manner, and to produce and supply quickly to meet the trending colors. With the above-mentioned effects, it is possible for a manufacturer selling a portable device equipped with a display device to sell a portable device equipped with a display device of a specific color while checking the sales of the product. Risks can be avoided.

Even when external light is dark, the built-in light source emits light to faithfully reproduce the color of the color filter, thereby enabling a wide variety of color displays. Furthermore, in this method, since the color filter is detachable, the color can be changed by the user himself. Therefore, it is possible to change the color of the display unit according to the season or the mood of the user himself,
It is effective in differentiating small portable devices such as watches that emphasize fashion.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of a color liquid crystal display device of the present invention.

FIG. 2 is a cross-sectional view illustrating a configuration of a liquid crystal display panel of the color liquid crystal display device of the present invention.

FIG. 3 shows a spectral transmittance of a color filter according to an embodiment of the present invention.

FIG. 4 shows the spectral transmittance of a color filter according to an embodiment of the present invention.

FIG. 5 is a sectional view of a color liquid crystal display device showing a configuration of another embodiment of the present invention.

FIG. 6 is a sectional view of a color liquid crystal display device showing a configuration of another embodiment of the present invention.

FIG. 7 is a sectional view of a color liquid crystal display device showing a configuration of another embodiment of the present invention.

FIG. 8 is a cross-sectional view illustrating a configuration of a liquid crystal display panel of a color liquid crystal display device according to an embodiment of the present invention.

FIG. 9 is a partially enlarged cross-sectional view of a color liquid crystal display device showing a configuration of another embodiment of the present invention.

FIG. 10 is a schematic diagram showing a display frame according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Exterior case 2 Color filter 3 Liquid crystal display panel 4 Support frame member 5 Transparent opening 6 Light source 7 Circuit block 8 Conductive member 9 Battery 10 Spring material 11 Incident white light 12 Specular reflection light 13 Scattered light 14 Observer 15 Substrate 16 Transparent electrode 17 Scattering type liquid crystal layer 18 Transparent electrode 19 Reflecting layer 20 Substrate 21 Display frame 22 Insulating film 23 Yellow light emitting phosphor

Continued on the front page (72) Inventor Kaoru Taniguchi 1-8-8 Nakase, Mihama-ku, Chiba-shi, Chiba Inside Seiko Instruments Inc. (72) Inventor Shigeru Chihonmatsu 1-8-1, Nakase, Mihama-ku, Chiba-shi, Chiba Seiko Instruments Inc. Inside the company (72) Shuhei Yamamoto 1-8-8 Nakase, Mihama-ku, Chiba-shi, Chiba Seiko Instruments Inc. (72) Inventor Hiroshi Sakuma 1-8-8 Nakase, Mihama-ku, Chiba-shi, Chiba Seiko Instruments Inc. (72) Inventor Kowa Fukuchi 1-8-8 Nakase, Mihama-ku, Chiba City, Chiba Prefecture Inside Seiko Instruments Inc. (72) Inventor Masafumi Hoshino 1-8-8 Nakase, Mihama-ku, Chiba City, Chiba Prefecture Inside Seiko Instruments Inc. ( 72) Inventor Naoshi Shino 1-8-8 Nakase, Mihama-ku, Chiba City, Chiba Prefecture Inside Seiko Instruments Inc. (72) Inventor Osamu Yamazaki Beauty, Chiba City, Chiba Prefecture 1-8-8 Nakase, Hama-ku Seiko Instruments Inc. (72) Inventor Masanori Fujita 4-9-1, Taihei, Sumida-ku, Tokyo Seiko Precision Co., Ltd.

Claims (9)

[Claims] 1. A display module in which a liquid crystal display panel having a scattering type liquid crystal layer and a reflection layer provided behind the scattering type liquid crystal layer, a circuit block, and a battery are accommodated in a support frame member, and the display module is accommodated. A color liquid crystal display device comprising: an outer case having a transparent opening; and a color filter provided between the display module and the outer case. 2. The color liquid crystal display device according to claim 1, wherein a display frame is disposed between said exterior case and said color filter. 3. The color liquid crystal display device according to claim 2, wherein said color filter is integrated with said display frame. 4. The color liquid crystal display device according to claim 2, wherein the display frame is integrated with the outer case. 5. A display module having a liquid crystal display panel having a scattering type liquid crystal layer and a reflection layer provided behind the scattering type liquid crystal layer, a circuit block, and a battery housed in a support frame member; A color liquid crystal display device comprising: an outer case for accommodating a module; and the outer case has an opening integrated with a color filter. 6. A display module having a liquid crystal display panel having a scattering type liquid crystal layer and a reflection layer provided behind the scattering type liquid crystal layer, a circuit block, and a battery housed in a support frame member; A color liquid crystal display device comprising: an outer case for housing a module; and a color filter detachably provided outside the transparent opening of the outer case. 7. The functional color filter according to claim 1, wherein the color filter has a function of changing a transmitted color with a change in temperature, a function of reproducing a hologram, or a function of changing coloring by absorbing light. The color liquid crystal display device according to claim 1, wherein: 8. The color liquid crystal display device according to claim 1, further comprising a light source configured to receive light for illumination from a side surface of the substrate of the liquid crystal display panel. 9. An outer case for housing a display module, a step of dropping a display frame into the outer case, a step of dropping a color filter from above, and a step of fixing the display module to the outer case via a spring member. And a method of manufacturing a color liquid crystal display device.