JPH0784275A - Color liquid crystal display device - Google Patents

Abstract

PURPOSE:To obtain a color liquid crystal display device with high picture quality though the power consumption thereof is low by constituting a picture element electrode of two layers of a metallic thin film and a layer including a day-light fluorescent material. CONSTITUTION:This device is constituted of a glass substrate (1) 101, a transparent electrode 102, a liquid crystal layer 103, a day-light fluorescent coloring matter(red fluorescent color) 104, a day-light fluorescent coloring matter(green fluorescent color) 105, a day-light fluorescent coloring matter(blue fluorescent color) 106, the reflecting picture element electrode 107, a switch element 108, a scanning line 109, an interlayer insulating film 110 and a glass sbustrate (2) 111. Then, the coloring matters 104-106 or day-light fluorescent pigments are used for a means executing color display and arranged on the electrode 107. That means, the coloring matters 104-106 are arranged on the reflecting surface of the respective elements 107. Then, many kinds of colors can be produced by an additive color mixture method by arranging three kinds of coloring matters 104-106 such as the red fluorescent color 104, the green fluorescent color 105 and the blue fluorescent color 106.

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 device.

[0002]

2. Description of the Related Art In recent years, color liquid crystal display devices have been attracting attention as displays replacing CRTs. In particular, the color liquid crystal display device has features such as thinness, light weight, and low power consumption, and along with the recent development of information equipment, it has been actively used for personal information equipment such as a notebook personal computer. Further, with the progress of mobile communication technology, portability of personal information devices has come to be emphasized, and further reduction in power consumption has been required for color liquid crystal display devices.

Unlike a CRT, a color liquid crystal display device is a non-emissive display and requires some kind of light source. Usually, there are two types, that is, the backlight is used together or the reflected light of the light in the environment is used.

An example of a sectional structure of a color liquid crystal display device using a backlight is shown in FIG. In the figure, 601 is a polarizing plate (1), 602 is a glass substrate (1), 603 is a color filter, 604 is a red filter, 605 is a green filter, 606 is a blue filter, 607 is a black filter, 60
8 is a transparent electrode, 609 is a liquid crystal layer, 610 is a scanning line, 611 is a switch element, 612 is a pixel electrode, 613 is a glass substrate (2), 614 is a polarizing plate (2), 615 is a backlight, and 616 is a diffuser. A plate, 617 is a fluorescent tube, and 618 is a reflecting plate.

In the case of a color liquid crystal display device using a backlight, a bright backlight can be used to create a bright screen, and it is currently used as a color display device for notebook personal computers, pocket televisions, etc., but in terms of power consumption. From the viewpoint, there is a drawback that the backlight consumes more than twice as much power as the color liquid crystal display device. For example, in the case of a color liquid crystal display device for a notebook computer,
The power consumption of the entire color liquid crystal display device (including the backlight and the IC for driving the liquid crystal panel) is about 6 W, but the backlight occupies 4 W.

On the other hand, an example of a sectional structure of a liquid crystal display device utilizing reflected light of light in the environment is shown in FIG. In the figure, 701 is a polarizing plate (1), 702 is a glass substrate (1), 703 is a transparent electrode, 704 is a light-shielding film, 705 is a liquid crystal layer, 706 is a scanning line, 707 is a switching element, and 708 is a pixel electrode. , 709 is a glass substrate (2), 710
Is a polarizing plate (2), and 711 is a reflecting plate.

In the case of a liquid crystal display device which uses reflected light of light in the environment, the backlight is not required as compared with the case where the above-mentioned backlight is used, so that power consumption is reduced and low power consumption is achieved. A liquid crystal display device that utilizes reflected light of light in this environment, that is, a reflection type liquid crystal display device is used as an important device. For example, at present, a portable personal computer using a reflective liquid crystal display device, which is a black and white display, is also on the market, which has significantly reduced the power consumption and greatly increased the continuous use time by the battery.

Further, a color reflection type color liquid crystal display device capable of displaying four colors of white, black, green and magenta while being a reflection type has also been developed (for example, S-ADI GIEST 92, 437-440 (1992). SID Digest 92,437-440 (199
2).)). An example of a sectional structure of this color liquid crystal display device is shown in FIG. In the figure, 801 is a glass substrate (1), 80
2 is a color filter, 803 is a magenta color filter, 80
4 is a green filter, 805 is a black filter, 806 is a transparent electrode, 807 is a liquid crystal layer, 808 is a reflective pixel electrode, 809 is a switching element, 810 is a scanning line, 811 is an interlayer insulating film, 812 is a glass substrate (2) Is.

This is because a thin film transistor having a reflective structure is used and the aperture ratio (of the entire display area of the color liquid crystal display device,
Ratio of area where light can be effectively controlled (contribution to display)
By using the guest-host mode as the liquid crystal operation mode, the polarizing plate is not used.

[0010]

At the present time, the portability of personal information equipment has come to be emphasized, and further lower power consumption is required for color liquid crystal display devices at present.
The above structure has a problem that a bright color liquid crystal display device with low power consumption cannot be obtained.

The structure shown in FIG. 6 enables bright and high-quality color display, but requires a strong backlight. For example, in the case of a color liquid crystal display device for a notebook type personal computer, the light transmittance of the liquid crystal panel is about 4%, and 96% of the light of the backlight is absorbed or reflected on the way. Examining the light transmittance of the liquid crystal panel in detail, the aperture ratio is about 40%, the transmittance of the polarizing plate is about 40%,
The transmittance of the color filter is about 30%, and the other elements such as pixel electrodes and liquid crystals are about 80%. (40% (aperture ratio) x 4
0% (polarizing plate) x 30% (color filter) x 80%
(Other) = about 4%) There are theoretical limitations such as aperture ratio, transmittance of polarizing plate, transmittance of color filter, etc., and we cannot expect a dramatic improvement, and we cannot expect a significant reduction in power consumption.

Here, the transmittance of the color filter will be particularly discussed. Currently, color filters are essential for color display. As shown in (FIG. 6), the color filter often uses a set of three color filters of a red filter, a green filter and a blue filter. In FIG. 6, there is another black filter, but this is for shielding the switch element on the opposite glass substrate (2) and for improving the contrast, and does not contribute to the creation of color for color display. One pixel electrode is arranged on the glass substrate (2) facing each of the red filter, the green filter and the blue filter. These three picture element electrodes form a set to create each color. Since red, green, and blue are the three primary colors in additive color mixing, if there are these three primary colors, all colors can be created by the method of mixing these. For example, a mixture of red, green, and blue creates white.

On the other hand, the blue filter is 40% of visible light.
Only light with a wavelength of about 0 nm to 500 nm is transmitted, and the rest is absorbed or reflected. There are several methods depending on the manufacturing method, but in many cases, the filter contains a dye or pigment, which absorbs light other than the wavelength of about 400 nm to 500 nm and consumes it as heat energy.
Similarly, the green and red filters are from 500 nm to 6
It transmits only light of about 00 nm or about 600 nm to 700 nm, absorbs light of other wavelengths, and consumes it as heat energy. In other words, each filter
Of the light in the region of 400 nm to 700 nm, only about 1/3 of the light is transmitted, and the remaining about 2/3 of the light is consumed by the filter itself and is not utilized as light.

As mentioned above, the creation of white is a mixture of red, green and blue, which is about 2 / by the filter.
Since 3 is consumed and light is added in each region of about 1/3, the transmittance of the color filter is theoretically limited to about 30% in this method.

Further, in the structure shown in FIG. 7, since no backlight is used, the power consumption can be significantly reduced as compared with the case of FIG. 6, but there is a problem in terms of brightness. In the case of a reflective liquid crystal display device, the reflectance of the panel is used as an index as a parameter related to brightness. The reflectance required for practical use is at least 15% or more. If possible, a reflectance of 45 to obtain the same display quality as that of printed matter such as newspaper.
60% is desired. For example, in the case of a liquid crystal display device for a notebook computer at present, the reflectance of light on a liquid crystal panel is about 25% in the case of monochrome display, and the reflectance necessary for practical use is temporarily cleared. However, even if an attempt is made to display a color by using a color filter, the reflectance of the color filter becomes about 7% because the transmittance of the color filter is about 30% as described above (25% (reflectance of a monochrome panel). ) × 30% (transmittance of color filter) = 7%), which is not practical.

Further, in the structure shown in FIG. 8, a reflective thin film transistor is used to increase the aperture ratio to 85%, and a phase transition guest-host mode is used as the operation mode of the liquid crystal to form a polarizing plate. Since it was not used, it was able to display four colors of white, black, green and magenta while being a reflective type, and realized a reflective color liquid crystal display device with a reflectance of about 30%, but it is the same as a desired printed matter such as newspaper. The reflectivity of 45 to 60%, which is a display quality, is not reached.

In view of the above problems, the present invention provides a structure of a color liquid crystal display device which has a high image quality while having low power consumption.

[0018]

In order to solve the above problems, the color liquid crystal display device of the present invention uses a daytime fluorescent dye or a daytime fluorescent pigment as a means for creating a color display, and this is used on a pixel electrode. It is characterized by being placed in.

[0019]

[Operation] The features of daytime fluorescent dyes or daytime fluorescent pigments (hereinafter simply referred to as daytime fluorescent dyes) will be discussed below.

Dyes and pigments used in conventional color filters create color based on absorption and transmission (or reflection) as described above. The absorbed light is consumed as heat energy.

On the other hand, the daytime fluorescent dye produces a color based on absorption and transmission (or reflection) as in the conventional case, and the absorbed light energy is emitted not as heat energy but as fluorescence. , Exactly the wavelength of the fluorescence matches the color based on transmission (or reflection).

FIG. 9 shows the reflection spectral characteristics of red / orange daytime fluorescent pigments. In the figure, 901 is the total reflectance, 902 is the fluorescence component, and 903 is the reflection component. When white light is incident, the reflected light is spectroscopically measured to be 620 nm
It has a peak in the vicinity and its total reflectance exceeds 200%. With conventional dyes, the reflectance cannot exceed 100%, but in the case of daytime fluorescent pigments, the normal reflection component and the fluorescence component shown in (Fig. 9) are added, and the apparent total reflectance is 200%. Will exceed.

In this case, the light that was conventionally absorbed and consumed as heat energy is emitted as light called fluorescence, and the incident light is effectively converted into colored light together with the light that is not absorbed and reflected. As a result, in the conventional color filter (using a dye based on the conventional principle of only absorption and transmission), the transmittance of about 30% was the limit in principle. In (), it is possible to use light more than twice as efficiently as before.

Therefore, the present invention can provide a high-quality color liquid crystal display device with low power consumption by using a daytime fluorescent dye as a means for creating a color display and arranging it on a pixel electrode. it can.

In particular, in the case of a reflective color liquid crystal display device, it is possible to realize color display with display quality comparable to that of printed matter such as newspaper, while having extremely low power consumption.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A color liquid crystal display device according to a first embodiment of the present invention will be described below with reference to the drawings. In the figure, 101 is a glass substrate (1), 102 is a transparent electrode, 103 is a liquid crystal layer, 104 is a daytime fluorescent dye (red fluorescent color), 105 is a daytime fluorescent dye (green fluorescent color), and 106 is a daytime fluorescent dye ( (Blue fluorescent color), 107 is a reflective pixel electrode, 108 is a switching element, 109 is a scanning line, 110 is an interlayer insulating film, and 111 is a glass substrate (2).

FIG. 1 is a sectional structural view of a reflective color liquid crystal display device according to the first embodiment of the present invention. By arranging daytime fluorescent dyes on the reflective surface of each reflective pixel electrode and by arranging three types of daytime fluorescent dyes of red fluorescent color, green fluorescent color, and blue fluorescent color, multiple colors can be created by additive color mixing. . It is desirable to use a material having a high reflectance such as aluminum for the pixel electrode, and it is desirable that the reflecting surface has irregularities and fine irregularities so that incident light is scattered.

A reflective thin film transistor or a thin film diode can be used as the switch element. As the liquid crystal operation mode, a guest host mode using a black dye as a guest, a phase transition guest host mode, or a liquid crystal operation mode using a polymer dispersed liquid crystal is desirable, but depending on the combination with a polarizer, a twist nematic mode or a super twist nematic mode. Alternatively, an electric field control birefringence mode may be used.

Daytime fluorescent dyes include thioflavin, brilliant sulfoflavin, acridine orange, eosin, rhodamine B, rhodamine 6B, fluorescein,
A pigment such as Lumogen Yellow may be used as it is, or may be dissolved in a synthetic resin such as acryl together with an ultraviolet absorber and cured, and then pulverized into fine powder to obtain a pigment.

By using the daytime fluorescent dye, the reflectance was improved more than twice as much as the conventional one. A color liquid crystal display device according to a second embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a sectional structural view of a reflective type color liquid crystal display device according to a second embodiment of the present invention. In the figure, 201
Is a glass substrate (1), 202 is a transparent electrode, 203 is a phase change guest-host liquid crystal layer, 204 is a daytime fluorescent dye (red fluorescent color), 205 is a daytime fluorescent dye (green fluorescent color), and 206 is a daytime fluorescent dye (blue). Fluorescent color), 207 is a reflective pixel electrode, 208 is amorphous silicon, 209 is a signal line, 210 is an interlayer insulating film, 211 is a gate insulating film, 212 is a scanning line, and 213 is a glass substrate (2).

A phase transition guest-host mode using a black dye as a guest was used as a liquid crystal operation mode, a reflective thin film transistor was used as a switch element, and aluminum having a reflective surface with irregularities and fine irregularities was used. As the daytime fluorescent dye, three types of red fluorescent color, green fluorescent color, and blue fluorescent color were used, and a pigment having an acrylic resin as a carrier was used. When a reflection type color liquid crystal display device having this structure was produced, the reflectance was 50%, and a color display having a display quality comparable to that of a printed matter such as newspaper was realized.

A color liquid crystal display device according to a third embodiment of the present invention will be described below with reference to the drawings. FIG. 3 is a sectional structural view of a reflective type color liquid crystal display device according to a third embodiment of the present invention. In the figure, 301 is a glass substrate.
(1), 302 is a transparent electrode, 303 is a light-shielding film, 304 is a daytime fluorescent dye (red fluorescent color), 305 is a daytime fluorescent dye (green fluorescent color), 3
06 is a daytime fluorescent dye (blue fluorescent color), 307 is a liquid crystal layer, 308 is a reflective pixel electrode, 309 is a switch element, 310 is a scanning line, 311
Is an interlayer insulating film, and 312 is a glass substrate (2).

The third embodiment differs from the first embodiment in that a light-shielding film is provided on the glass substrate (1). This light-shielding film is arranged so as to shield light between the opposing reflective pixel electrodes. Others are the same as those in the first embodiment.

It is desirable that the light shielding film looks black when viewed through the glass substrate (1). As a result, the contrast of the display image is improved as compared with the first embodiment.

In the drawing, the position of the light-shielding film is between the transparent electrode and the liquid crystal layer, but it may be between the glass substrate (1) and the transparent electrode.

A color liquid crystal display device according to a fourth embodiment of the present invention will be described below with reference to the drawings. FIG. 4 is a sectional structural view of a reflective type color liquid crystal display device according to a fourth embodiment of the present invention. In the figure, 401 is a polarizing plate.
(1), 402 is a glass substrate (1), 403 is a transparent electrode, 404 is a light-shielding film, 405 is a liquid crystal layer, 406 is a daytime fluorescent dye (red fluorescent color),
407 is a daytime fluorescent dye (green fluorescent color), 408 is a daytime fluorescent dye (blue fluorescent color), 409 is a scanning line, 410 is a switch element, 41
1 is a pixel electrode, 412 is a glass substrate (2), 413 is a polarizing plate (2), 414
Is a reflector.

In the case of the present embodiment, it is desirable that the pixel electrode is transparent to visible light and, for example, ITO or the like is used. A thin film transistor or a thin film diode can be used for the switch element. As the liquid crystal operation mode, a twist nematic mode, a super twist nematic mode, or an electric field control birefringence mode can be used. A guest-host mode using a black dye as a guest, a phase-transition guest-host mode, or a liquid crystal operation mode using a polymer-dispersed liquid crystal can also be used. In that case, the polarizing plate (1) and the polarizing plate (2) shown in FIG. 4 are used. Either or both can be omitted.

The daytime fluorescent dye has a reflectance of 15% when three types of red fluorescent color, green fluorescent color and blue fluorescent color are used.
Therefore, the reflectance that can be practically used was obtained.

In the drawing, the light shielding film is located between the transparent electrode and the liquid crystal layer, but it may be located between the glass substrate (1) and the transparent electrode.

A color liquid crystal display device according to a fifth embodiment of the present invention will be described below with reference to the drawings. FIG. 5 is a sectional structural view of a color liquid crystal display device according to a fifth embodiment of the present invention. In the figure, 501 is a polarizing plate (1), 502
Is a glass substrate (1), 503 is a transparent electrode, 504 is a light-shielding film, 505 is a liquid crystal layer, 506 is a daytime fluorescent dye (red fluorescent color), 507 is a daytime fluorescent dye (green fluorescent color), and 508 is a daytime fluorescent dye ( (Blue fluorescent color), 509 scanning line, 510 switching element, 511 pixel electrode, 512 glass substrate (2), 513 polarizing plate (2), 514 backlight, 515 diffuser plate, 516 fluorescent The tube and 517 are reflectors.

The present embodiment is a color liquid crystal display device using a backlight. The pixel electrode is preferably transparent to visible light, and ITO, for example, is used. A thin film transistor or a thin film diode can be used for the switch element. As the liquid crystal operation mode, a twist nematic mode, a super twist nematic mode, or an electric field control birefringence mode can be used. A guest-host mode using a black dye as a guest, a phase-transition guest-host mode, or a liquid crystal operation mode using a polymer-dispersed liquid crystal can also be used. In that case, the polarizing plate (1) and the polarizing plate (2) shown in FIG. 4 are used. Either or both can be omitted. Three types of red fluorescent color, green fluorescent color, and blue fluorescent color were used as daytime fluorescent dyes. As a result, the power consumption of the backlight required to obtain the same brightness screen as when using the conventional color filter was halved.

In the drawing, the position of the light-shielding film is between the transparent electrode and the liquid crystal layer, but it may be between the glass substrate (1) and the transparent electrode.

In the first to fifth embodiments described above,
A set of three colors of red fluorescent color, green fluorescent color, and blue fluorescent color is set so that full color is possible by using additive color mixture, but if the display colors are limited, it is not necessary to stick to these three colors, for example red fluorescent color. Two colors of color and green fluorescent color may be set as one set, or two colors of magenta fluorescent color and green fluorescent color may be set as one set. Further, it is most desirable to combine only the fluorescent colors, but in some cases, it is possible to combine the fluorescent colors with general dyes and pigments.

Further, in FIGS. 1 to 8, the description of the alignment film for aligning the liquid crystal is omitted. When a polymer liquid crystal is used, an alignment film is not required, but when liquid crystal molecules need to be regularly aligned.For example, when a nematic mode is used, both ends of the liquid crystal layer (glass substrate (1) side and glass substrate (2))
An alignment film is required on the side). For the alignment film, for example, a rubbing-treated polyimide or the like is used.

[0045]

As described above, the color liquid crystal display device of the present invention provides a color liquid crystal display device of low power consumption and high image quality due to the structure in which the daytime fluorescent dye is used and arranged on the pixel electrode. can do.

Particularly, in the case of the reflective color liquid crystal display device, it is possible to realize color display with display quality comparable to that of printed matter such as newspaper, while having ultra-low power consumption.

[Brief description of drawings]

FIG. 1 is a sectional structural view of a color liquid crystal display device according to a first embodiment of the present invention.

FIG. 2 is a sectional structural view of a color liquid crystal display device according to a second embodiment of the present invention.

FIG. 3 is a sectional structural view of a color liquid crystal display device according to a third embodiment of the present invention.

FIG. 4 is a sectional structural view of a color liquid crystal display device according to a fourth embodiment of the present invention.

FIG. 5 is a sectional structural view of a color liquid crystal display device according to a fifth embodiment of the present invention.

FIG. 6 is a sectional structural view of a conventional color liquid crystal display device using a backlight.

FIG. 7 is a cross-sectional structural diagram of a conventional reflective liquid crystal display device for monochrome display.

FIG. 8 is a sectional structural view of a conventional reflective color liquid crystal display device.

FIG. 9: Reflection spectral characteristic diagram of daytime fluorescent pigment

[Explanation of symbols]

 101 Glass substrate (1) 102 Transparent electrode 103 Liquid crystal layer 104 Daytime fluorescent dye (red fluorescent color) 105 Daytime fluorescent dye (green fluorescent color) 106 Daytime fluorescent dye (blue fluorescent color) 107 Reflective pixel electrode 108 Switch element 109 Scan line 110 Interlayer insulation film 111 Glass substrate (2) 201 Glass substrate (1) 202 Transparent electrode 203 Phase transition guest-host liquid crystal layer 204 Daytime fluorescent dye (red fluorescent color) 205 Daytime fluorescent dye (green fluorescent color) 206 Daytime fluorescent dye (blue) (Fluorescent color) 207 Reflective pixel electrode 208 Amorphous silicon 209 Signal line 210 Interlayer insulating film 211 Gate insulating film 212 Scan line 213 Glass substrate (2) 301 Glass substrate (1) 302 Transparent electrode 303 Light-shielding film 304 Daytime fluorescent dye (red fluorescence) Color) 305 Daytime fluorescent dye (green fluorescent color) 306 Daytime fluorescent dye (blue fluorescent color) 307 Liquid crystal layer 308 Reflective pixel electrode 309 Switch element 310 Scan line 311 Interlayer insulating film 312 Glass substrate (2) 401 Polarizing plate (1) 402 Glass substrate (1) 403 Transparent electrode 404 Shield Light film 405 Liquid crystal layer 406 Daytime fluorescent dye (red fluorescent color) 407 Daytime fluorescent dye (green fluorescent color) 408 Daytime fluorescent dye (blue fluorescent color) 409 Scan line 410 Switch element 411 Picture element electrode 412 Glass substrate (2) 413 Polarized light Plate (2) 414 Reflector 501 Polarizer (1) 502 Glass substrate (1) 503 Transparent electrode 504 Light-shielding film 505 Liquid crystal layer 506 Daytime fluorescent dye (red fluorescent color) 507 Daytime fluorescent dye (green fluorescent color) 508 Daytime fluorescent dye (Blue fluorescent color) 509 Scan line 510 Switch element 511 Pixel electrode 512 Glass substrate (2) 513 Polarizing plate (2) 514 Backlight 515 Diffusing plate 516 Fluorescent tube 517 Reflecting plate 601 Polarizing plate (1) 602 Glass substrate (1 ) 603 Color filter 604 Red filter 605 Green filter 606 Blue filter 607 Black filter 608 Transparent electrode 609 Liquid crystal layer 610 Scan line 611 Switch element 612 Picture element electrode 613 Glass substrate (2) 614 Polarizing plate (2) 615 Backlight 616 Diffuser 617 Fluorescent tube 618 Reflector 701 Polarizer (1 ) 702 Glass substrate (1) 703 Transparent electrode 704 Light-shielding film 705 Liquid crystal layer 706 Scan line 707 Switch element 708 Picture element electrode 709 Glass substrate (2) 710 Polarizing plate (2) 711 Reflector 801 Glass substrate (1) 802 Color filter 803 Magenta color filter 804 Green filter 805 Black filter 806 Transparent electrode 807 Liquid crystal layer 808 Reflective pixel electrode 809 Switch element 810 Scan line 811 Interlayer insulating film 812 Glass substrate (2) 901 Total reflectance 902 Fluorescent component 903 Reflective component

Claims (5)

[Claims] 1. An active matrix including a first substrate including a transparent substrate that transmits visible light and a transparent electrode, a switch element, a scanning line, and picture element electrodes arranged in a matrix driven by the switch element. An array and a second formed
And a liquid crystal layer sealed in a facing gap between the first substrate and the second substrate, wherein the pixel electrode is a metal thin film and a daytime fluorescent material. A color liquid crystal display device characterized by comprising two layers including a layer containing. 2. A transparent substrate which transmits visible light, a first substrate including a transparent electrode and a light shielding film, a switch element, a scanning line, and pixel electrodes arranged in a matrix which are driven by the switch element. A color liquid crystal display device comprising: a second substrate on which an active matrix array including the second substrate is formed; and a liquid crystal layer sealed in a facing gap between the first substrate and the second substrate, The pixel electrode is composed of two layers, a metal thin film and a layer containing a daytime fluorescent material.
2. The color liquid crystal display device, wherein the light-shielding layer in the substrate is arranged so as to cover gaps between the picture element electrodes arranged in a matrix in the opposing second substrate. 3. The picture element electrode has a reflection surface for reflecting visible light incident through the liquid crystal layer, and the picture element electrode is configured to block the visible light by a switch element. The color liquid crystal display device according to claim 1 or 2. 4. The liquid crystal operation mode of the liquid crystal layer is a guest host mode, a phase transition guest host mode, a twist nematic mode, a super twist nematic mode, or an electric field control birefringence mode. 3. The color liquid crystal display device according to item 3. 5. The color liquid crystal display device according to claim 1, wherein a polymer dispersed liquid crystal is used for the liquid crystal layer.