JPH1184365A - Liquid crystal device and electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal device capable of making bright and distinct reflection type color display and an electronic apparatus small in electric power consumption. SOLUTION: This liquid crystal device has a pair of substrates 102, 104 which have electrodes 108, 109 on the inside surfaces facing each other and form dot groups of a matrix form, at least three colors of color filter groups 107 which are disposed between these substrates in correspondence to the dots and liquid crystals 103 which are held between the substrates. The color filters of the colors having the highest visible feel among the color filter groups 10 are so arrayed that the same color dots are not adjacent to each other and the same color dots of the color filters of the colors exclusive thereof are adjacent to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal device, and more particularly, to a reflective or transflective color liquid crystal device, and more particularly to an electronic apparatus equipped with the liquid crystal device.

[0002]

2. Description of the Related Art There are several methods for realizing a reflective or transflective color display.
The method using the TN mode has a great advantage. This is a method proposed in Japanese Patent Application No. 9-505010, filed by us earlier, and is characterized by high contrast display and high reliability. In addition, it is attractive that the conventional transmission color liquid crystal device manufacturing technology can be used as it is.

An outline of such a reflection type color liquid crystal device will be described. FIG. 13 is a diagram showing a main part of the structure of a conventional reflective color liquid crystal device. In the figure, 1301 is an upper polarizing plate, 1302 is a counter substrate, 1303 is a liquid crystal, 1304 is an element substrate, 1305 is a lower polarizing plate, 1306 is a reflection means, and a color filter group 13 is provided on the counter substrate 1302.
07, a counter electrode (scanning line) 1308, and a signal line 1309, a pixel electrode 1310,
An IM element 1311 was provided. Where 1301 and 130
2, 1304 and 1305, 1305 and 1306 are drawn apart, but this is for the sake of clarity,
Actually, they are glued together. Also, the space between the opposing substrate 1302 and the element substrate 1304 is drawn widely apart, but for the same reason, there is actually only a gap of about several μm to about several tens μm. FIG. 13 shows a part of a reflection type color liquid crystal device, and thus three scanning lines 1308 are provided.
Although only a 3 × 3 matrix, ie, 9 dots, formed by intersecting the three signal lines 1309 with each other are shown in the figure, actually, it has more dots. Color filter group 13
07 are arranged corresponding to one color for one dot.

There are various variations in the color filter arrangement. Conventionally, three types of arrangements often used are a mosaic arrangement, a delta arrangement, and a stripe arrangement. FIGS. 14, 15, and 16 are examples of a mosaic arrangement, a delta arrangement, and a stripe arrangement, respectively. “R”, “G”, and “B” in the figure indicate red, green, and blue color filters, respectively. The broken lines in the drawing indicate the boundaries of the dots.

[0005] The conventional color filter array is designed in consideration of the fact that dots of the same color are not adjacent to each other as shown in FIG. Only in the stripe arrangement, dots of the same color are adjacent in the vertical direction, but at least stripes of the same color are designed not to be adjacent.
Such a design means aims at improving color mixing and making individual dots hard to be recognized by the eyes.

[0006]

However, the conventional T
The reflective color liquid crystal device using the N mode or the STN mode has a problem that the display is dark and the display color is pale. The cause is parallax.

The problem of parallax will be described with reference to the drawings. FIGS. 17A and 17B are cross-sectional views of a reflection type color liquid crystal device using a TN mode or an STN mode. This liquid crystal device includes an upper polarizing plate 1701, an upper glass substrate 1702, a liquid crystal layer 1703, a lower glass substrate 1704, a lower polarizing plate 1705, a light reflecting plate 1706, and a three-color filter 1707 of red, green and blue. A transparent electrode, an alignment film, an insulating film and the like also exist between the upper and lower glass substrates, but they are omitted because they are not necessary for explaining the problem of parallax.

There are two problems of parallax. One of them is the cancellation of colors. In FIG. 17A, the observer 1712 has the reflected light 1 that has exited through the green filter.
Looking at 711, this light is a mixture of light 1713 that has passed through the red, green, and blue filters and is scattered and reflected by the light reflection plate. If the thickness of the lower glass substrate is sufficiently thicker than the pitch of the color filters, light that has passed through filters of any color is mixed with equal probability. However, light passing through the red → green and blue → green paths is absorbed by any of the color filters and becomes darker. The same can be said for the reflected light coming out through the blue or red filter, so that the brightness of the white display becomes significantly darker than the case where there is no parallax. If a bright color filter is used to alleviate this phenomenon, the display color will become paler.

Another problem is that the color display becomes dark. FIG. 17B shows a green display state. In addition, a hatched portion of the liquid crystal layer 1703 indicates a non-lighting state (dark state). The incident light 1713 passes through the red, green, and blue dots with equal probability, and two-thirds of the light is absorbed by the red and blue dots in the off state. Further, after being scattered and mixed by the light reflection plate, 2/3 are absorbed again by the red and blue dots in the off state, and reach the observer 1712. Therefore, the green display becomes very dark.

In order to fundamentally solve such a problem, the only way to reduce the parallax is to reduce the thickness of the lower glass substrate or increase the dot pitch. However, all of these means are difficult.

An object of the present invention is to provide a liquid crystal device capable of performing bright and vivid reflective color display without changing the thickness and dot pitch of a glass substrate by devising a color filter arrangement. . Another object of the present invention is to provide an electronic device with low power consumption.

[0012]

According to a first aspect of the present invention, there is provided a liquid crystal device comprising: a pair of substrates having electrodes formed on opposing inner surfaces to form a matrix of dot groups; A liquid crystal device having at least three color filter groups and a liquid crystal sandwiched between the substrates, wherein an arrangement of a color filter group having the highest visibility among the color filter groups is other than the above. It is characterized in that it is different from the arrangement of the color filter group of the color. More preferably, it is desirable that the arrangement of the color filter groups other than the color having the highest visibility is all the same. The same array
Refers to an array that can be overlaid by translation (except outside the drive area). In addition, the high luminosity means that the CIE 193 obtained from the spectral transmittance characteristics of the color filter.
This means that the chromaticity coordinate Y of the 1XYZ color system is large, that is, the luminous transmittance is high. With this configuration, the liquid crystal device according to the first aspect of the present invention independently designs a dot array of a color with high visibility that determines resolution and a dot array of color with low visibility that determines display color. Can be done.

A liquid crystal device according to a second aspect of the present invention is the liquid crystal device according to the first aspect, wherein the color filters having the highest luminosity in the color filter group do not have adjacent dots of the same color. The color filter of the color is characterized in that dots of the same color are arranged adjacently. However, this is not the case around and outside the drive area. It is sufficient if two dots of the same color are adjacent to each other. With this configuration, the liquid crystal device according to claim 2 can perform bright and vivid color display while maintaining high resolution.

According to a third aspect of the present invention, in the liquid crystal device according to the first aspect, all of the color filter groups are arranged in a stripe shape, and a color filter having the highest luminous efficiency is adjacent to a stripe of the same color. The color filters of other colors do not match, and the same color stripes are arranged adjacent to each other. However, this is not the case around and outside the drive area. It is sufficient if two stripes of the same color are adjacent to each other. With this configuration, the liquid crystal device according to claim 3 can perform bright and vivid color display while maintaining high resolution.

According to a fourth aspect of the present invention, there is provided the liquid crystal device according to the first aspect, wherein the color filters having the highest luminosity in the color filter group are formed in stripes, and stripes of the same color are adjacent to each other. The color filters of other colors are arranged such that dots of the same color are adjacent to each other. However, this is not the case around and outside the drive area. It is sufficient if two dots of the same color are adjacent to each other. With such a configuration, the liquid crystal device according to claim 4 can perform bright and vivid color display while maintaining high resolution.

According to a fifth aspect of the present invention, there is provided the liquid crystal device according to any one of the first to fourth aspects, wherein a color filter other than a color having the highest luminous efficiency is provided with a dot of the same color across a long side of the dot. It is characterized by being adjacent to each other. However, this is not the case around and outside the drive area. It is sufficient if two dots of the same color are adjacent to each other. With this configuration, the liquid crystal device according to claim 5 can perform brighter and more vivid color display.

The liquid crystal device according to claim 6 is the liquid crystal device according to any one of claims 2 to 5, wherein a color filter of the same color is provided also in a region between the adjacent dots or stripes of the same color. It is characterized by. However, this is not the case around and outside the drive area. With such a configuration, the liquid crystal device according to the sixth aspect facilitates the manufacture of a color filter and can perform more vivid color display.

The liquid crystal device according to claim 7 is the liquid crystal device according to any one of claims 1 to 6, wherein the color having the highest visibility is green, and the other colors are red and blue. Features. An additive color liquid crystal device is thus red,
Green and blue primary color filters are often used.
Rarely, red, green, blue, and white color filters may be used.In this case, the color with the highest visibility is white, and the other colors are red, green, and blue. is there.
With such a configuration, the liquid crystal device according to claim 7 is
A natural color or a color close to it can be displayed.

According to an eighth aspect of the present invention, in the liquid crystal device according to the seventh aspect, the arrangement of the color filter group is as follows.
Red, green, blue, blue, green, and red dots are repeatedly arranged in this order. With such a configuration, the liquid crystal device according to claim 8 can perform bright and vivid red display and blue display while maintaining high resolution.

According to a ninth aspect of the present invention, there is provided the liquid crystal device according to any one of the first to sixth aspects, wherein the color having the highest visibility is yellow, and the other colors are magenta and cyan. It is characterized by the following. This is usually the case when using the subtractive primary colors, but sometimes the color having the highest luminosity (luminous transmittance) is cyan and the other colors are magenta and yellow. is there. With such a configuration, the liquid crystal device according to claim 9 can perform brighter display.

A liquid crystal device according to a tenth aspect is the liquid crystal device according to the first aspect, wherein an area of one dot corresponding to a color filter having the highest visibility in the color filter group is: It is characterized in that it is about half the area of one dot corresponding to the color filters of other colors. With this configuration, the liquid crystal device according to the tenth aspect can perform high-resolution display with a smaller number of dots. Further, the number of driving drivers is small, which is economical.

A liquid crystal device according to an eleventh aspect is the liquid crystal device according to any one of the first to tenth aspects, further comprising a reflection means on an outer surface of the substrate. With this configuration, the liquid crystal device according to claim 11 can perform reflective color display.

A liquid crystal device according to a twelfth aspect is characterized in that the liquid crystal device according to the first to eleventh aspects is provided as a display unit. With such a configuration, the liquid crystal device according to the twelfth aspect of the invention consumes less power and can obtain a bright and vivid display.

[0024]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(Embodiment 1) FIG. 1 is a view showing a main part of the structure of a liquid crystal device according to the first, second, seventh, eighth, and eleventh aspects of the present invention. . First, the configuration will be described. In the figure, 101 is an upper polarizing plate, 102 is a counter substrate, 103 is a liquid crystal, 104 is an element substrate, 105 is a lower polarizing plate, and 106 is a reflecting means. Electrode (scanning line) 108
And a signal line 109, a pixel electrode 110, and a MIM element 111 are provided on the element substrate 104. Where 101 and 1
02, 104 and 105, and 105 and 106 are drawn apart for the sake of clarity of the drawing, and are actually glued together. Also, the opposing substrate 102 and the element substrate 1
04 is widely separated, but for the same reason, there is actually only a gap of about several μm to several tens of μm. Although FIG. 1 shows a part of the liquid crystal device, only a 3 × 3 matrix formed by crossing three scanning lines 1308 and three signal lines 1309, that is, nine dots is illustrated. Actually have more dots. The color filter group 107 is arranged corresponding to one color for each dot.

The counter electrode 108 and the pixel electrode 110 were formed of transparent ITO, and the signal line 109 was formed of metal Ta.
The MIM element has a structure in which an insulating film Ta2O5 is sandwiched between metal Ta and metal Cr. The liquid crystal 103 is a nematic liquid crystal twisted by 90 degrees, and the polarization axes of the upper and lower polarizers are orthogonal to each other. This is a general TN mode configuration. The color filters 107 are red (indicated by "R" in the figure) and green (indicated by "G" in the figure) which are three primary colors of additive color mixture.
And blue (indicated by "B" in the figure) and arranged in a mosaic pattern.

Although the MIM active matrix type liquid crystal device has been described as an example here, the effect of the present invention is not changed even if a simple matrix type liquid crystal device is adopted. In such a case, connect the signal line to a rectangular IT
O is formed, and the MIM element and the pixel electrode are not provided. Further, instead of the TN mode, an STN mode using liquid crystal twisted from 180 degrees to 270 degrees is employed. A phase difference plate may be provided for the purpose of compensating the coloring of the display in the STN mode.

As the reflection means 106, a diffuse reflection plate obtained by sputtering a metal aluminum thin film on an embossed polymer film is used, but a reflection type polarizing plate can also be used. The reflective polarizing plate has a property of reflecting light of a predetermined linearly polarized light component and reflecting other light. Therefore, a lower polarizing plate is not required. As such a reflective polarizing plate, a method utilizing a birefringent dielectric multilayer film is disclosed in an international application (international application number: WO
97/01788) and Japanese Patent Publication No. 9-506985. Such a reflective polarizing plate is commercially available from 3M Corporation in the United States as DBEF (trade name), and is generally available.

FIG. 2 is a diagram showing the spectral characteristics of the color filter 107. The horizontal axis of FIG. 2 is the light wavelength, the vertical axis is the transmittance, 201 is the spectrum of the red color filter, 20
2 indicates the spectrum of the green color filter, and 203 indicates the spectrum of the blue color filter. The spectrum is measured using a microspectrophotometer on the opposite substrate alone, and the transmittance is corrected to 100% when the glass substrate, transparent electrode, and overcoat and undercoat are provided. did. Since the color filter used in the reflective color liquid crystal device has such a very light color tone, it should be “pink” instead of “red”, “white-green” instead of “green”, and “blue”. "", Not ""
Although it is more accurate to write such as, etc., in order to avoid confusion, all expressions below are unified with pure color.

The feature of the liquid crystal device of the first embodiment resides in its color filter arrangement. Since only 3 × 3 = 9 dots could be shown in FIG. 1, FIG. 3 shows an array of 9 × 9 = 81 dots in a plan view. Of course, the actual liquid crystal device is composed of more dots, and the vertical 3 ×
An array of 6 = 18 dots in the horizontal direction constitutes one unit and is repeated in the vertical and horizontal directions. “R” and “G” in FIG.
“B” indicates a red, green, and blue color filter, respectively. Dashed lines outside the individual color filters indicate dot boundaries. Although nothing is shown in the area between the color filters, a black mask for shielding light or a transparent filter for filling holes may be provided in this area. Further, the color filters may be provided without gaps or may be overlapped.

This color filter arrangement is a kind of mosaic arrangement. Compared with FIG. 14, only the arrangement of the green filters is the same, but the arrangement of the red and blue filters is different. In the conventional mosaic arrangement, dots of the same color are not adjacent to each other, but in the mosaic arrangement of the first embodiment, a red filter and a blue filter are adjacent to each other with a pair of color filters of the same color by two dots.

When the color filters of the reflection type color liquid crystal device are arranged in this manner, the possibility that the incident light and the reflected light pass through the same color dot increases, so that the display color of red or blue system becomes bright and vivid. On the other hand, there are concerns about adverse effects such as reduced resolution, individual dots being easily recognized by the eyes, and poor color mixing, but such effects were extremely small. This is because the green filters having the highest visibility are arranged apart from each other as in the related art, and the resolution is determined by the green filters. This means, for example, that “SID International
temporalSymposium Digest of
Technical Papers, Volume
XXIV, pp. 606, 1993 ".
Here, it is reported that in a three-panel liquid crystal projector, even if the number of pixels of the blue liquid crystal light valve is reduced to half, there is almost no change in image quality.

(Embodiment 2) Embodiment 2 relates to a liquid crystal device according to the first, second, seventh, eighth and eleventh aspects of the present invention. Its structure is substantially the same as that of the liquid crystal device of the first embodiment shown in FIGS. 1 and 2, except that the dot arrangement is a delta arrangement.

FIG. 4 is a diagram showing an arrangement of color filters in a liquid crystal device according to Embodiment 2 of the present invention. "R" in the figure
“G” and “B” indicate red, green, and blue color filters, respectively, and broken lines outside the individual color filters indicate dot boundaries.

When the color filter arrangement of FIG. 4 is compared with the conventional delta arrangement shown in FIG. 15, only the arrangement of the green filters is the same, but the arrangement of the red and blue filters is different. In the conventional delta arrangement, dots of the same color are not adjacent to each other, but in the delta arrangement of the second embodiment, a red filter and a blue filter are adjacent to color filters of the same color, and are connected in an oblique direction.

When the color filters of the reflection type color liquid crystal device are arranged in this manner, the possibility that the incident light and the reflected light pass through the same color dot increases, so that the display color of red or blue system becomes bright and vivid. The adverse effects such as reduced resolution, individual dots being easily recognized by the eyes, and poor color mixing were not noticeable.

(Embodiment 3) Embodiment 3 relates to a liquid crystal device according to the first, third, fifth, seventh, eighth and eleventh aspects of the present invention. Its structure is almost the same as that of the liquid crystal device of the first embodiment shown in FIGS. 1 and 2, except that the color filter array is a stripe array.

FIG. 5 is a diagram showing an arrangement of color filters in a liquid crystal device according to Embodiment 3 of the present invention. "R" in the figure
“G” and “B” indicate red, green, and blue color filters, respectively, and the broken lines indicate dot boundaries.

When the color filter arrangement of FIG. 5 is compared with the conventional stripe arrangement shown in FIG. 16, only the arrangement of the green filters is the same, but the arrangement of the red and blue filters is different. In the conventional stripe arrangement, stripes of the same color are not adjacent to each other, and are arranged regularly by repeating “red, green, and blue”. On the other hand, the stripe arrangement of the third embodiment repeats “red green blue blue green red”, and two stripes of the red filter and two stripes of the blue filter are adjacent to each other. In the case of a stripe arrangement, a square pixel is often composed of three red, green and blue dots, and each dot is necessarily rectangular. In such a case, it is desirable that dots of the same color are adjacent to each other across the long side of the dot. This arrangement increases the possibility that the incident light and the reflected light pass through the same color dot for light incident from any direction, and makes the red or blue display color bright and vivid. In this case, too, adverse effects such as a decrease in resolution, an individual dot being easily recognized by the eyes, and poor color mixing were hardly noticeable.

(Embodiment 4) Embodiment 4 relates to a liquid crystal device according to the first, fourth, fifth, seventh, eighth and eleventh aspects of the present invention. Its structure is substantially the same as that of the liquid crystal device of the first embodiment shown in FIGS. 1 and 2, but the color filter arrangement is different.

FIG. 6 is a view showing an arrangement of color filters in a liquid crystal device according to Embodiment 4 of the present invention. "R" in the figure
“G” and “B” indicate red, green, and blue color filters, respectively, and the broken lines indicate dot boundaries.

In the color filter arrangement shown in FIG. 6, the arrangement of the green filters may be called a stripe arrangement. This is because, although discontinuous, the green filters are arranged in a line in the vertical direction. The red and blue filters are not striped. However, it is the same as FIG. 5 of the third embodiment in that two color filters of the same color are adjacent to each other across the long side of the dot. FIG. 5 is similar to FIG. 5 in that “red green blue blue green red” is repeated when viewed sequentially in the horizontal direction. Also in such a case, there is a high possibility that the incident light and the reflected light pass through the same color dot, and the display color of red or blue system becomes bright and vivid. The adverse effects such as lower resolution, individual dots being more easily recognized by the eye, and poor color mixing are very small.

(Embodiment 5) Embodiment 5 is directed to a liquid crystal device according to the first, second, third, sixth, seventh, eighth, and eleventh aspects of the present invention. About. Its structure is substantially the same as that of the liquid crystal device of the first embodiment shown in FIGS. 1 and 2, but the arrangement of the color filters is different.

FIG. 7 is a diagram showing an arrangement of color filters in a liquid crystal device according to Embodiment 5 of the present invention. "R" in the figure
“G” and “B” indicate red, green, and blue color filters, respectively, and the broken lines indicate dot boundaries.

The color filter arrangement of FIG. 7 can be said to be substantially the same as that of FIG. 3 of the first embodiment. The difference is that, when dots of the same color are adjacent to each other, a color filter of the same color is provided also in a region therebetween. This facilitates the manufacture of the color filter and enables a more vivid color display.

(Embodiment 6) Embodiment 6 relates to a liquid crystal device according to the first, second, third, fifth, ninth and ninth aspects of the present invention. Its structure is substantially the same as that of the liquid crystal device of the first embodiment shown in FIGS. 1 and 2, but instead of the color filters of red, green and blue, which are the three primary colors of the additive color mixture, the three primary colors of the subtractive color mixture, yellow, cyan, The difference is that a magenta color filter is used.

FIG. 8 is a diagram showing the spectral characteristics of the color filters used in the liquid crystal device of the sixth embodiment. 8, the horizontal axis represents the wavelength of light, and the vertical axis represents the transmittance. 801 is the spectrum of the yellow color filter, 802 is the cyan color filter, 8
03 shows the spectrum of the magenta color filter. Among them, the luminous transmittance of the yellow color filter is the highest.

FIG. 9 is a diagram showing an arrangement of color filters in a liquid crystal device according to Embodiment 6 of the present invention. "Y" in the figure
“C” and “M” indicate yellow, cyan and magenta color filters, respectively, and broken lines outside the individual color filters indicate dot boundaries. In the color filter array of FIG. 9, only the yellow filter having the highest visibility is not adjacent to the same color filter, and the cyan color filter and the magenta color filter are adjacent to each other in pairs of two color filters of the same color.

FIG. 10 is a diagram showing another arrangement of the color filters in the liquid crystal device according to the sixth embodiment of the present invention.
“Y”, “C”, and “M” in the figure are yellow, cyan,
A magenta color filter is shown, and a broken line indicates a dot boundary. In the color filter array of FIG. 10, only the stripe of the yellow filter having the highest visibility is not adjacent to the stripe of the same color, and the cyan filter and the magenta filter are each adjacent to two stripes of the same color.

When the color filters of the reflection type color liquid crystal device are arranged in this manner, the possibility that the incident light and the reflected light pass through the same color dot increases, so that the display colors of cyan and magenta colors are bright and vivid. Become. There are also very few adverse effects such as lower resolution, easier recognition of individual dots by eyes, and poor color mixing.

Although the luminous transmittance of the yellow filter is the highest here, a color filter having the highest luminous transmittance of the cyan filter may be used. In that case, the same color dots / stripe of the cyan filter are arranged so as not to be adjacent to each other.

(Embodiment 7) Embodiment 7 relates to a liquid crystal device according to the first, tenth and eleventh aspects of the present invention. Its structure is substantially the same as that of the liquid crystal device of the first embodiment shown in FIGS. 1 and 2, except that the size of each dot differs depending on the color of the corresponding color filter.

FIG. 11 is a view showing an arrangement of color filters in a liquid crystal device according to Embodiment 7 of the present invention. "R" in the figure
“G” and “B” indicate red, green, and blue color filters, respectively, and broken lines outside the individual color filters indicate dot boundaries.

The color filter arrangement of FIG. 11 is almost the same as the color filter arrangement of the third embodiment shown in FIG.
The only difference is whether adjacent same color filters are connected or not. However, not only the color filters are connected, but the dots themselves are also connected. That is, the area of the red dot and the area of the blue dot are twice as large as the area of the green dot.

This further pursues the concepts of the liquid crystal devices of the first to sixth embodiments. If the resolution is secured with green dots with high visibility, the appearance does not change even if the remaining color dots are omitted boldly. Red (blue) dots are adjacent to two pixels (one pixel = RG
A data voltage approximately equal to the average of the data voltages to be applied to red (blue) of B3 dots) may be applied. By adopting such a configuration, the number of liquid crystal driving drivers can be reduced to nearly 2/3. Further, since the number of MIM elements is reduced, an improvement in yield can be expected. Of course, the effect of making the display color of red or blue system bright and vivid is the same as in the liquid crystal devices of the first to fifth embodiments.

(Eighth Embodiment) Three examples of the electronic apparatus according to the twelfth aspect of the present invention will be described. INDUSTRIAL APPLICABILITY The liquid crystal device of the present invention is suitable for portable equipment used in various environments and requiring low power consumption.

FIG. 12A shows a mobile phone, and the main body 12
A display unit 1202 is provided in an upper part of the front surface of the display unit 01. Mobile phones are used in all environments, both indoors and outdoors.
Moreover, at least 200 hours or more in the standby state,
Batteries are required to have. Therefore, as a display device used for a mobile phone, a transflective liquid crystal device capable of performing a transmissive display using auxiliary light as necessary is mainly used for a reflective display with low power consumption. Conventionally, a liquid crystal device meeting such a demand has been only a monochrome display, but by using the liquid crystal device of the present invention, bright and vivid colors can be displayed without increasing power consumption.

FIG. 12 (b) shows a watch,
A display unit 1204 is provided at the center of the display unit 03. In watch applications, the demand for power consumption is even more stringent.
The liquid crystal device of the present invention can meet such demands.

FIG. 12C shows a portable information device. A display unit 1206 is provided above the main body 1205, and an input unit 120 is provided below the main unit 1205.
7 are provided. In addition, since touch keys are often provided on the front surface of the display unit, the display tends to be dark. Therefore, conventionally, a reflection type monochrome liquid crystal device or a transmission type color liquid crystal device has been used. However, the former has a drawback in usability (viewability), and the latter has a drawback in power consumption. The reflective color liquid crystal device of the present invention is capable of bright and vivid color display, and has the same power consumption as the reflective monochrome liquid crystal device. Therefore, the liquid crystal device of the present invention is most suitable for applications such as portable information devices.

[0060]

As described above, according to the liquid crystal device of the present invention, by devising the color filter arrangement,
A liquid crystal device capable of bright and vivid reflective color display can be provided. Further, the present invention can provide an electronic device with low power consumption.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a main part of a structure of a liquid crystal device according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating spectral characteristics of a color filter of a liquid crystal device according to Embodiments 1 to 5 and 7 of the present invention.

FIG. 3 is a diagram illustrating an arrangement of color filters of the liquid crystal device according to the first embodiment of the present invention.

FIG. 4 is a diagram illustrating an arrangement of color filters of a liquid crystal device according to a second embodiment of the present invention.

FIG. 5 is a diagram illustrating an arrangement of color filters of a liquid crystal device according to a third embodiment of the present invention.

FIG. 6 is a diagram illustrating an arrangement of color filters of a liquid crystal device according to a fourth embodiment of the present invention.

FIG. 7 is a diagram illustrating an arrangement of color filters of a liquid crystal device according to a fifth embodiment of the present invention.

FIG. 8 is a diagram illustrating spectral characteristics of a color filter of a liquid crystal device according to a sixth embodiment of the present invention.

FIG. 9 is a diagram illustrating an arrangement of color filters of a liquid crystal device according to a sixth embodiment of the present invention.

FIG. 10 is a diagram showing another arrangement of the color filters of the liquid crystal device in Embodiment 6 of the present invention.

FIG. 11 is a diagram illustrating an arrangement of color filters of a liquid crystal device according to a seventh embodiment of the present invention.

FIG. 12 is a diagram illustrating an appearance of an electronic device according to an eighth embodiment of the present invention. (A) mobile phone, (b) watch,
(C) portable information devices.

FIG. 13 is a diagram showing a main part of the structure of a conventional liquid crystal device.

FIG. 14 is a diagram showing a mosaic arrangement which is one of the color filter arrangements of a conventional liquid crystal device.

FIG. 15 is a diagram showing a delta arrangement which is one of the color filter arrangements of a conventional liquid crystal device.

FIG. 16 is a diagram showing a stripe arrangement which is one of the color filter arrangements of a conventional liquid crystal device.

FIG. 17 is a diagram illustrating a problem of parallax in a reflective color liquid crystal device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 Upper polarizing plate 102 Counter substrate 103 Liquid crystal 104 Element substrate 105 Lower polarizing plate 106 Reflecting means 107 Color filter group 108 Counter electrode (scanning line) 109 Signal line 110 Pixel electrode 111 MIM element 201 Red color filter spectrum 202 Green color filter Spectrum 203 Spectrum of blue color filter

Claims (12)

[Claims] 1. A pair of substrates each having an electrode on an opposing inner surface to form a matrix of dot groups, a color filter group of at least three colors provided between the substrates corresponding to the dots, and A liquid crystal device having a sandwiched liquid crystal, wherein an arrangement of a color filter group of a color having the highest visibility among the color filter groups is different from an arrangement of a color filter group of other colors. Liquid crystal device. 2. The liquid crystal device according to claim 1, wherein the color filters having the highest luminosity in the color filter group do not have adjacent dots of the same color, and the color filters of other colors have the same color dots. Are arranged so that they are adjacent to each other. 3. The liquid crystal device according to claim 1, wherein the color filter groups are all arranged in a stripe pattern, and the color filters having the highest luminous efficiency do not have adjacent stripes of the same color, and the other color filters have the same color. Wherein the color filters are arranged such that stripes of the same color are adjacent to each other. 4. The liquid crystal device according to claim 1, wherein the color filters having the highest luminosity in the color filter group are in the form of stripes, stripes of the same color are not adjacent to each other, and color filters of other colors are not arranged. A liquid crystal device wherein the color filters are arranged so that dots of the same color are adjacent to each other. 5. The liquid crystal device according to claim 1, wherein a color filter other than a color having the highest visibility is adjacent to a dot of the same color across a long side of the dot. Liquid crystal devices. 6. The liquid crystal device according to claim 2, wherein a color filter of the same color is provided also in a region between said adjacent dots or stripes of the same color. 7. The liquid crystal device according to claim 1, wherein the color having the highest visibility is green, and the other colors are red and blue. 8. A liquid crystal device according to claim 7, wherein said color filter group has red, green, blue, blue, green, and red dots repeatedly arranged in this order. . 9. The liquid crystal device according to claim 1, wherein the color having the highest visibility is yellow, and the other colors are magenta and cyan. . 10. The liquid crystal device according to claim 1, wherein the area of one dot corresponding to the color filter having the highest visibility in the color filter group is a color filter of another color. A liquid crystal device, wherein the area is about half the area of one dot corresponding to. 11. The liquid crystal device according to claim 1, further comprising a reflection means on an outer surface of said substrate. 12. An electronic apparatus comprising the liquid crystal device according to claim 1 as a display unit.