JPH0455825A - Color liquid crystal display device - Google Patents

Abstract

PURPOSE:To allow the selection of 3 kinds of display modes by including plural color selecting members and 1st display electrodes in a 1st liquid crystal element and including 2nd display electrodes in a 2nd liquid crystal element. CONSTITUTION:The liquid crystal element 22 for color display have a pair of transparent substrates 24a, 24b and a color filter layer 25 is provided over nearly the entire part of one surface of the transparent substrate 24a. Plural segment electrodes 26 having light transparency are formed on the color filter layer 25. Further, an oriented film 27a is formed on the color filter layer 25 formed with the segment electrodes 26. The liquid crystal element 23 for black and white display has a pair of transparent substrates 31a, 31b and the plural segment electrodes 37 having light transparency are formed on one surface of the transparent substrate 31a over the range corresponding to the predetermined shape to be displayed in a display region. Further, an oriented film 32a is formed on the transparent substrate 31a formed with the segment electrodes 37. The displaying is diversified in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a color liquid crystal display device capable of performing color display and monochrome display.

Conventional technology JP-A-60-260921, JP-A-61-239220
, Japanese Patent Laid-Open No. 62-091917 discloses a segment type color liquid crystal display device in which stripe-shaped color filters are formed over almost the entire display screen.

In this color liquid crystal display device, it is possible to select either normally white display or normally black display by changing the arrangement of the polarizing plate, but in the case of normally black display, the incident light is The optical rotation dispersion phenomenon inside the liquid crystal layer causes elliptically polarized light, which causes leakage light that passes through the liquid crystal layer even when no voltage is applied, reducing the contrast of the display screen.

A two-layer liquid crystal display device has been developed as a solution to the above-mentioned decrease in contrast (Japanese Patent Publication No. 63-535
28, JP 63-234225>.

The two-layer liquid crystal display device disclosed herein is constructed by stacking two liquid crystal elements in which liquid crystal molecules are aligned in a twisted nematic manner.One liquid crystal display element is a display liquid crystal element, and the other liquid crystal element is a display liquid crystal element. The element is a compensating liquid crystal element for returning the elliptically polarized light to linearly polarized light.

FIG. 14 is a cross-sectional view of a conventional two-layer liquid crystal display device 1. As shown in FIG. The liquid crystal display device 1 includes a display liquid crystal element 2 and a compensation liquid crystal element 3.The display liquid crystal element 2 includes a pair of transparent substrates 4a and 4b made of glass, acrylic, or the like.
A color filter 5 is provided on one surface of the transparent substrate 4a.
is provided over almost the entire surface, and the color filter 5
A plurality of segment electrodes 6 having translucency are formed thereon. Furthermore, an orientation j[7a is formed on the segment electrode 6 and the color filter 5. The color filter 5 is composed of, for example, band-shaped three-color filters extending parallel to the plane of FIG. 14, such as a red filter, a green filter, and a blue filter.

A plurality of light-transmitting common electrodes 8 are formed on one surface of the transparent substrate 4b, and an orientation M7b is formed on the transparent substrate 4b on which the common electrodes 8 are formed.

The transparent substrates 4a and 4b are arranged so that the surfaces on which the alignment films 7a and 7b are formed face each other, and the twisted liquid crystal 9 is interposed between the transparent substrates 4a and 4b and sealed with a sealing resin 10. will be stopped.

The compensation liquid crystal element 3 has transparent substrates 11a and llb made of glass, acrylic, etc.
Alignment films 12a and 12b are formed on one surface of the substrate, respectively. The transparent substrates 11a and 11b have alignment films 12a and 12
The surfaces formed with b are arranged so as to face each other,
The twisted nematic liquid crystal 13 has a transparent substrate 11a,
11b, and is sealed with a sealing resin 14.

The display liquid crystal element 2 and the compensation liquid crystal element 3 are connected to a transparent substrate 4.
a and a transparent substrate 11b are stacked so as to overlap, a polarizing plate 15 is arranged on the surface of the transparent substrate 4b opposite to the liquid crystal layer 9, and a polarizing plate 15 is arranged on the surface of the transparent substrate 11a opposite to the liquid crystal layer 13. A polarizing plate 16 is arranged.

The liquid crystal layers 9 and 13 are arranged so that the orientation directions of the liquid crystal molecules closest to each other are perpendicular to each other, and the twist directions of the liquid crystal molecules in the respective liquid crystal layers are opposite to each other. The polarizing plates 15 and 16 are arranged so as to form crossed Nicols.

Problems to be Solved by the Invention Since segment type color liquid crystal display devices display segments, they can display only predetermined colors and display screens (shapes), and lack diversity in display.

Furthermore, even in the two-layer type liquid crystal display device shown in FIG. It was scarce.

Furthermore, the color filter 5 is formed by band-shaped three-color filters (a red filter, a green filter, and a blue filter) with widths that cannot be discerned with the naked eye, and the segment tai
6 corresponding to each filter, it is possible to display the same display image in different colors; There is a problem that the display quality is deteriorated.

An object of the present invention is to provide a color liquid crystal display device with improved display diversity and display quality in color display.

Means for Solving the Problems The present invention provides a color liquid crystal display device in which first and second liquid crystal elements are laminated, each having a pair of transparent substrates sandwiching a liquid crystal layer therebetween, in which the first liquid crystal element has a transparent substrate. Provided over the entire surface of one side in the thickness direction of the optical substrate,
A plurality of color selection members each selecting one of a plurality of predetermined colors for transmitted light, and a predetermined color selection member provided within a display area on the liquid crystal layer side of the translucent substrate to be displayed in the display area. A first color selection member formed in a range corresponding to the plurality of color selection members selected corresponding to the color.
The color liquid crystal display device is characterized in that the second liquid crystal element includes a second display electrode formed in a range corresponding to a predetermined shape to be displayed in the display area.

According to the present invention, by stacking the first and second liquid crystal elements so that no light passes through the color liquid crystal display device when the voltage is cut off, the alignment directions of the liquid crystal molecules closest to each other are perpendicular to each other. By stacking them in such a manner, normally black display with a black background can be performed. Here, in the first liquid crystal element, a first display electrode is formed corresponding to a desired color selection member, and by applying a voltage, the amount of light transmitted through the liquid crystal layer is determined in advance by the color selection member. One color is selected, and the predetermined color is thereby displayed in the display area. At this time, by individually forming display electrodes corresponding to multiple types of color selection members and combining multiple types of colors selected by the color selection members, further different colors can be displayed in the display area. . This allows color display to be performed in a color liquid crystal display device.

Furthermore, in the second liquid crystal element, the second display electrode is formed in a range corresponding to a predetermined shape to be displayed in the display area, so light can be transmitted by applying a voltage to the second display electrode. , the predetermined shape can be displayed in white.

As a result, black and white display can be performed on a color liquid crystal display device.

Therefore, in the liquid crystal display device according to the present invention, three types of display modes can be selected: color display, black and white display, and a combination of color display and black and white display, thereby providing display diversity.

Further, for example, the first and second liquid crystal elements may be stacked such that the liquid crystal molecules of the liquid crystal layers of the first and second liquid crystal elements are twisted in opposite directions, and the orientation directions of the liquid crystal molecules closest to each other are orthogonal to each other. As a result, the transmitted light, which becomes elliptically polarized light by passing through the liquid crystal layer of the first liquid crystal element, is oriented in the opposite direction to the liquid crystal molecules of the first liquid crystal element when passing through the liquid crystal layer of the second liquid crystal element. Because of the liquid crystal molecules,
In addition, the extraordinary light component and the normal light component of the incident polarized light from the first liquid crystal element to the second liquid crystal element are arranged so that the closest liquid crystal molecules are orthogonal to each other. , the elliptically polarized light cancels out and returns to linearly polarized light.

Therefore, the light transmitted through the area where the first display electrode is not formed in the first liquid crystal element and the area corresponding to the first display electrode to which no voltage is applied is completely blocked by the second liquid crystal element, and the light is completely blocked by the second liquid crystal element. leakage can be prevented. As a result, it is possible to display complete black without coloring, and it is possible to improve the contrast in so-called normally black display in which the background color is black.

Embodiment FIG. 1 is a sectional view of a liquid crystal display device 21 which is an embodiment of the present invention. The liquid crystal display device 21 has two twisted nematic mode liquid crystal elements, a liquid crystal element 22 for color display and a liquid crystal element 23 for black and white display.

The color display liquid crystal element 22 has a pair of transparent substrates 24a and 24b made of glass, plastic, etc., and a color filter layer 25 is provided on one surface of the transparent substrate 24a over almost the entire surface. A plurality of light-transmitting segment electrodes 26 are formed on the layer 25, and an alignment film 27a is further formed on the color filter layer 25 on which the segment electrodes 26 are formed. On one surface of the transparent substrate 24b, a common electrode 28 having translucency is provided over a region including at least the segment electrodes 26.
is formed, and an alignment film 27b is further formed thereon. The transparent substrates 24a, 24b have alignment films 27a, 2
7b are arranged so that the surfaces on which they are respectively formed face each other. The twisted nematic liquid crystal layer 29 is
A sealing material 30 is interposed between the transparent substrates 24a and 24b.
is sealed by.

Polyimide resin was used for the orientation wI27a, 27b. The alignment films 27a and 27b are formed to have a layer thickness of, for example, 600 mm, and are rubbed with a woven nylon cloth so that the alignment direction of liquid crystal molecules is twisted by 90° between the transparent substrates 24a and 24b, forming a left-handed liquid crystal layer. being processed.

In order to keep the distance between the transparent substrates 24a and 24b constant,
A plastic spacer (not shown) is sandwiched between these substrates. With this spacer, the distance between the substrates is set to, for example, 5 μm. A sealing material 30 for sealing the liquid crystal layer 29 is an epoxy resin.

For the liquid crystal layer 29, for example, a phenylcyclohexane mixed liquid crystal is selected. Furthermore, cholesteric nonenate is added to this liquid crystal, giving it levorotatory properties.

The black-and-white display liquid crystal element 23 has a pair of transparent substrates 31a and 31b made of glass, plastic, etc., and one surface of the transparent substrate 31a is transparent over a range corresponding to a predetermined shape to be displayed in the display area. A plurality of segment electrodes 37 having optical properties are formed, and the segment electrodes 3
An orientation B52a is formed on the transparent substrate 31a on which 7 is formed. A common electrode 38 having translucency is formed on one surface of the transparent substrate 31b over an area including at least the segment electrode 37, and the transparent substrate 31. An alignment film 27b is formed on b. The transparent substrates 31a, 31b have alignment films 32a, 3
2b are arranged such that the surfaces on which they are respectively formed face each other. The twisted nematic liquid crystal layer 33 is
A sealing material 34 is interposed between the transparent substrates 31a and 31b.
is sealed by.

Polyimide resin is used for the alignment films 32a and 32b,
The transparent substrates 31a and 31b are subjected to rubbing treatment so that the orientation direction of the liquid crystal molecules is twisted by 90'' to form a dextrorotatory liquid crystal layer.

For the liquid crystal layer 33, phenylcyclohexane-based mixed liquid crystal was used as in the color display liquid crystal element 22 described above. This liquid crystal layer contains, for example, CB as a dextrorotatory chiral substance.
-15 (manufactured by Merck & Co.) is added. Transparent substrate 31
In order to keep the distance between a and 31b constant, a plastic spacer was sandwiched between these substrates, as in the case of the color display liquid crystal element 22, and the substrates were stacked one on top of the other.

The distance between the transparent substrates 31a and 31b is selected to be, for example, 5 μm.

Polarizing plates 35 and 36 are provided on the opposite side of the transparent substrates 24b and 31a from the liquid crystal layer 29 and 30, respectively.

Segment electrode 26.37 and common electrode 4I! 28.
38 is formed by ITOT. The sheet resistance value of ITO is 2
A medium resistance value of 0 to 50 Ω/mouth is generally used, but a low resistance value or 100 Ω/mouth or more may also be used.

FIG. 2 shows segment electrodes 2 of a color liquid crystal display device 21.
In this embodiment, a case where a bar graph is displayed on the liquid crystal display device 21 will be described. Segment electrode 2 of liquid crystal element 22 for color display
6 is formed into a rectangular shape for displaying a bar graph, and six segment electrodes 26 are arranged.

The segment electrodes 37 of the liquid crystal element 23 for black and white display are connected to the frame line of the graph and the characters r□J and "1" as memory of the graph.
0'', ``20J'', ``a'' to ``f'', and the text rLCD-12345J for explaining the graph.

FIG. 3 is an enlarged plan view showing the structure of the color filter layer 25, and FIG. 4 is an enlarged sectional view of the vicinity of the color filter layer 25. The color filter layer 25 has red, green,
It is formed by arranging blue filters in a matrix or mosaic pattern. In FIGS. 3 and 4, the red filter is designated by reference numeral R, the green filter is designated by reference numeral G, and the blue filter is designated by reference numeral B. The size of each filter R, G, and B is fine. , so large that it cannot be seen with the naked eye.

- As an example, length L1 = 330 μm and width L2 - 80
Rectangular filters R, G, and B of μm are used, and the interval L3 between the filters is selected to be 30 μm. Therefore, three types of filters R, G, and B are lined up in the width direction A2 of the filter.
The area formed by this is a square of 330 μm×330 μm.

The spacing L3 between the filters is determined by the manufacturing accuracy of color filters such as photoprocessing, and is generally 15 μm to 15 μm.
It is 40 μm.

The filter arrangement is R-G- in the width direction A2 of the filter.
The permutation of B is repeated, and in the longitudinal direction A1 of the filter, R-
The BG permutation is repeated. The shapes of the filters R, G, and B may be square or other shapes.

Moreover, between each filter R, G, and B, a black light shielding layer 40 is provided.
is formed. The light shielding layer 40 is made of chromium (Cr), black pigment, or the like.

In this embodiment, the color filter layer 25 is formed by filters R and GB of three colors, red, green, and blue, but the color filter layer 25 is formed after selecting two desired colors from the three colors. It's okay. Furthermore, the filters are not limited to the three colors of red, green, and blue, but may be filters of yellow, magenta, cyan, or the like. In this case as well, a two-color filter may be used as described above. Furthermore, the color filter layer 25 may be formed using filters of four or more colors.6 FIG. 5 shows the segment t! This is an enlarged plan view of 26.
The segment electrode 26 is composed of a red electrode Sr, a green electrode Sg, and a blue electrode sb. Electrode Sr, S
g, Sb are formed in respective regions corresponding to the filters R, G, B in the display area, and each electrode Sr, Sg, Sb
are transparent electrodes 41r, 41. as signal lines. g, 41
They are connected by b. In this way, by sequentially connecting the electrodes Sr, Sg, and Sb corresponding to filters of the same color and arbitrarily selecting the electrode to which voltage is applied, red, yellow, green, light blue (cyan), blue, white,
Seven colors including pink (magenta) can be displayed within the target display area.

FIG. 6 shows polarizing plates 35 and 36 in the liquid crystal display device 21.
continuous light direction and twisted nematic liquid crystal layer 29
．． 33 is a diagram for explaining the orientation direction of liquid crystal molecules of No. 33. FIG. FIG. 6(1) shows the absorption axis R1 of the polarizing plate 36. FIG. 6(2) shows the orientation direction and twist direction of the liquid crystal molecules in the liquid crystal layer 33 of the liquid crystal element 23 for black and white display. There is. The alignment direction of the liquid crystal molecules closest to the transparent substrate 31a is indicated by an arrow R2, and this alignment direction R2 is indicated by the polarizing plate 36.
is parallel to the absorption axis R1 of Further, the alignment direction of the liquid crystal molecules closest to the transparent substrate 31b is indicated by an arrow R3.
Therefore, the liquid crystal molecules of the liquid crystal layer 33 are twisted 90 degrees to the right.

FIG. 6(3) shows the orientation direction and twist direction of liquid crystal molecules in the liquid crystal layer 29 of the liquid crystal display element 22 for color display. The alignment direction of the liquid crystal molecules closest to the transparent substrate 24a is indicated by an arrow R4, and the alignment direction of the liquid crystal molecules closest to the transparent substrate 24b is indicated by an arrow R5. Therefore, the liquid crystal molecules of the liquid crystal layer 29 are twisted 90° to the left. FIG. 6(4) shows an absorption axis R6 of the polarizing plate 35, and this absorption axis R6 is parallel to the alignment direction R5 of the liquid crystal molecules closest to the transparent substrate 24b.

As shown in FIG. 6, the twist angles of the liquid crystal molecules in the liquid crystal layer 29 of the liquid crystal element 22 for color display and the liquid crystal layer 33 of the liquid crystal element 23 for monochrome display are both 90 degrees. In addition, the liquid crystal layer 2
The liquid crystal molecules in the liquid crystal layer 33 are oriented in a levorotatory manner, and the liquid crystal molecules in the liquid crystal layer 33 are oriented in a dextrorotatory manner. That is, two liquid crystal elements 2
In 2.23, the twist directions of the liquid crystal molecules are set to be opposite to each other. Furthermore, the orientation direction of the liquid crystal molecules closest to the transparent substrate 24a of the liquid crystal layer 29 and the orientation direction of the liquid crystal molecules closest to the transparent substrate 31b of the liquid crystal layer 33 are arranged to be orthogonal to each other. Furthermore, the polarizing plates 35 and 36 are arranged so as to form crossed Nicols.

In a two-layer liquid crystal display device, optical compensation can be performed depending on the twist direction of the liquid crystal molecules in each liquid crystal layer and the positional relationship between the orientation directions of the liquid crystal molecules closest to each other.

Table 1 below shows the positional relationship between the twist direction and the alignment direction, and the effects associated therewith.

In this example, in order to give priority to optical compensation,
A state is used in which the twist directions of the liquid crystal molecules are opposite, and the alignment directions of the liquid crystal molecules closest to each other are perpendicular to each other.

FIG. 7 is a block diagram showing the configuration of the color liquid crystal display device 21. As shown in FIG. A backlight 43 is arranged on the opposite side of the polarizing plate 35 from the color display liquid crystal element 22, and the light from the backlight 43 is transmitted/blocked using the color display liquid crystal element 22 and the monochrome display liquid crystal element 23. As a result, a display screen as described later is displayed on the liquid crystal display device 21. The color display liquid crystal element 22 is controlled by a color display liquid crystal element drive circuit 45. The color display liquid crystal element drive circuit 45 applies a voltage to the common electrode 28 via the signal line p1 based on the display control signal from the 5 display control circuit 47, and applies a voltage to the selected segment electrode via the signal line group I2. A voltage is applied to 26. This allows the color display liquid crystal element 22 to perform color display. The liquid crystal element 23 for black and white display is shown in the liquid crystal element drive diagram for black and white display N! 46. The liquid crystal element driving diagram l@46 for black and white display applies a voltage to the common electrode 38 via the signal line 13 based on the l1lI control signal from the display control circuit 47, and selects the liquid crystal element via the signal line group 14. A voltage is applied to the segment electrodes 37. As a result, black and white display can be performed on the black and white display liquid crystal element 23.

(The following is a blank space) Table 2 Table 2 shows an example of a combination of liquid crystal display elements and their display states when displaying using two liquid crystal display elements. In the case of combination C, the use of two liquid crystal elements for color display is effective in terms of display diversity, but the stacking of two color filters causes moiré, making it impractical. , What is moire?
In the case of 6 combination B, which is a rough pattern created by overlapping two regular patterns, two liquid crystal elements for black and white display are used.
It is not very effective in terms of display diversity, and although it is possible to display it, it is not usually used.

In the case of combination A, color display and white display can be performed with the background color being black.

The twisted nematic mode display method includes:
Positive display method (the ON area before coining becomes a light-blocking display,
There are two display methods: normally white display (display method in which the area where no voltage is applied, that is, the OFF region is the transmitted light display), and a negative display method (the ON region before coining is the transmitted light display,
There is a display method in which a region to which no voltage is applied, that is, an OFF region is a light-shielding display, that is, a normally black display.

In the case of a normally black display, the black display can be made darker by using a two-layer liquid crystal display device, whereas the black display cannot be made darker with a normally white display in a two-layer liquid crystal display device. That is, this is because the upper element cannot completely optically compensate for the distortion of light from the lower element. Therefore, the present invention uses normally black display.

In the case of a general twisted nematic liquid crystal display device,
The driving conditions are a frequency of 30Hz to 200H2 and a threshold voltage of 5V to 7V. In normally black display,
The area receiving an applied voltage exceeding the threshold voltage, i.e. OF
Area F becomes a light-blocking display.

FIG. 8 is a timing chart for explaining the driving method of the color liquid crystal display device 21, and FIG. 9 is a plan view showing a display example of the color liquid crystal display device 21. Figure 8 (1
) shows the driving state of the liquid crystal element 22 for color display, in which high level indicates when voltage is applied, and low level indicates when no voltage is applied. The driving state of the circuit is shown, with a high level when voltage is applied and a low level when no voltage is applied.

In the period T1, the display is performed only by the black and white display liquid crystal element 23, so the frame line of the bar graph and various characters are displayed in the 6th period T2, as shown in the 9th [J (1)].
Since the display is performed only on the color display liquid crystal element 22, only the bar graph is displayed as shown in FIG. 9(2).

During period T3, display is performed on both the color display liquid crystal element 22 and the black and white display liquid crystal element 23, so that the frame lines of the bar graph and various characters, as shown in FIG. 9(3),
Table 6, in which the bar graph is displayed, shows the color display liquid crystal element 22 (lower cell) and the monochrome display liquid crystal element 23 (lower cell).
The correspondence relationship between the driving state of the upper cell) and the display state of the display screen is shown. As shown in FIG. 5, the segment electrodes 26 include a red electrode Sr, a green electrode Sg, and a blue electrode sb corresponding to the three color filters R, G, and B, respectively.
It is made up of. Therefore, the desired electrodes Sr, S
By applying voltage to g and Sb, it is possible to display seven colors.

In FIG. 9, in the segment electrode 26a, voltage is applied only to the red electrode Sr, so that red is displayed. In the segment electrode 26b, a voltage is applied only to the green voltage (iSg), so green is displayed.

The segment electrodes 26c can display three different colors. That is, in the region C1, a voltage is applied only to the red electrode Sr, so red is displayed; in the region C2, a voltage is applied only to the blue electrode sb, so blue is displayed; and in the region C3, a red color is displayed. Since a voltage is simultaneously applied to Sr and the green electrode Sg, yellow is displayed.

Since a voltage is simultaneously applied to the green electrode Sg and the blue electrode sb in the segment electrode 26d, light blue is displayed. Since a voltage is simultaneously applied to the red electrode Sr and the blue electrode sb in the segment electrode 26e, pink (magenta) is displayed.

In the segment electrode 26f, three electrodes Sr, Sg, s
Since a voltage is simultaneously applied to b, white is displayed.

10 and 11 are graphs showing viewing angle characteristics of the color liquid crystal display device 21. FIG. FIG. 10 (1) shows viewing angle characteristics in normally black display when the liquid crystal element 23 for monochrome display is turned off. In FIG. 10 (1), the area surrounded by line flo is an area where the contrast ratio CO is 10 or more, the area surrounded by line 111 is an area where the contrast ratio Co is 40 or more, and the area surrounded by line 112 is an area where the contrast ratio Co is 40 or more. The contrast ratio CO is a region of 100 or more. The contrast ratio near the center was 162.

FIG. 10(2) shows viewing angle characteristics in normally white display when the black and white display liquid crystal element 23 is turned on. In FIG. 10(2), the area surrounded by line 11B is an area where the contrast ratio CO is 10 or more, and the area surrounded by line p14 is an area where the contrast ratio Co is 40 or more. The contrast ratio near the center was 50. This indicates that normally black display is superior to normally white display in liquid crystal display device 21.

FIG. 11 (1) is a diagram showing the viewing angle range when displaying using only the monochrome display liquid crystal element 23 in normally black display, and FIG. 11 (2) is a diagram showing a color display in normally black display. The viewing angle characteristics are shown when display is performed using only the liquid crystal element 22. Figure 11 (1)
and in FIG. 11(2), line 115. Z16
The area respectively enclosed by is the contrast ratio CO
indicates an area of 10 or more. As shown in FIG. 11, the viewing angle characteristics are almost the same regardless of which display element, the liquid crystal element 22 for color display or the liquid crystal element 23 for monochrome display, is used.

Table 4 Table 4 shows the contrast in each display state. Sufficient contrast can be obtained in all cases of color display, black and white display, and color and black and white simultaneous display.

As described above, according to this embodiment, two types of display screens, a color display screen and a black and white display screen, can be displayed.
Provides display diversity.

Furthermore, since the color filter layer 25 is composed of rectangular filters R, G, and H arranged in a matrix, it is possible to control the mixing degree of colors when displaying different colors by combining filters of different color types. The clarity of displayed colors is improved, allowing you to display beautiful colors.

In this embodiment, the liquid crystal element 23 for black and white display is laminated on the liquid crystal element 22 for color display, but the liquid crystal element 22 for color display may be laminated on the liquid crystal element 23 for black and white display. The present invention is not limited to a segment type liquid crystal display device, but may also be applied to a simple matrix type or active matrix type liquid crystal display device.

12 and 13 are cross-sectional views for explaining another embodiment of the present invention. This embodiment is similar to the previously described embodiment, and corresponding components are designated by the same reference numerals. Attached 1
The feature of this embodiment is that the color filter layer 25 is formed on the transparent electrode fi 24a on which the segment electrodes 26 are formed.This embodiment also has the same effect as described above.

Effects of the Invention As described above, according to the present invention, it is possible to select three types of display mode in a color liquid crystal display device: color display, black and white display, and display by a combination of color display and black and white display. You get variety.

Furthermore, the light that passes through the area where the first display electrode is not formed in the first liquid crystal element and the area corresponding to the first display electrode to which no voltage is applied is completely blocked by the second liquid crystal element, and the light is completely blocked by the second liquid crystal element. leakage can be prevented. As a result, it is possible to display a completely black color without coloring, and it is possible to improve the contrast in so-called normally black display where the background color is black.

[Brief explanation of the drawing]

FIG. 1 shows a color liquid crystal display device 2 which is an embodiment of the present invention.
1 is a cross-sectional view of the color filter layer 25, FIG. 2 is a plan view of the color liquid crystal display device 21, FIG. 3 is an enlarged plan view of the color filter layer 25, FIG. 4 is a cross-sectional view of the color filter layer 25, and FIG. 6 is a diagram showing the relationship between the orientation direction and the twist direction of liquid crystal molecules of the color liquid crystal display device 21, and FIG. 7 is a block diagram showing the electrical structure of the color liquid crystal display device 21. FIG. 8 is a timing chart for explaining the driving state of the color liquid crystal display bag w21, FIG. 9 is a plan view showing a display example of the color liquid crystal display device 21, and FIG.
11 are graphs showing viewing angle characteristics in the color liquid crystal display device 21, FIGS. 12 and 13 are cross-sectional views for explaining other embodiments of the present invention, and FIG. 14 is a conventional liquid crystal display device. FIG. 1 is a sectional view showing the configuration of FIG. 21... Color liquid crystal display device, 22... Liquid crystal element for color display, 23... Liquid crystal element for monochrome display, 24a. 24b, 31a, 3lb-transparent substrate, 25...
・Color filter layer, 26.37...Segment electrode, 2838...Common electrode, 29.33...Liquid crystal layer, R1, red filter, G...green filter, B...
・Blue filter, Sr...electrode for red color, Sg...electrode for green color, sb...electrode for blue color Patent attorney Keiichi Saikyo Figure 4 Figure 12 Figure 13

Claims (1)

[Claims] In a color liquid crystal display device in which first and second liquid crystal elements are stacked, each having a pair of transparent substrates sandwiching a liquid crystal layer therebetween, the thickness of the first liquid crystal element is determined by the thickness of the transparent substrate. Provided over the entire surface on one side of the direction,
A plurality of color selection members each selecting one of a plurality of predetermined colors for transmitted light, and a predetermined color selection member provided within a display area on the liquid crystal layer side of the translucent substrate to be displayed in the display area. A first color selection member formed in a range corresponding to the plurality of color selection members selected corresponding to the color.
A color liquid crystal display device comprising: a display electrode, wherein the second liquid crystal element includes a second display electrode formed in a range corresponding to a predetermined shape to be displayed in the display area.