JPH03223716A - Color liquid crystal display device - Google Patents

Abstract

PURPOSE:To improve the display quality by including a transparent display electrode formed in a range corresponding to plural color selection members selected corresponding to a predetermined color. CONSTITUTION:On a glass substrate 21a, rectangular color filters 1 of three colors, i.e. red, green, and blue are arrayed zigzag. When segment electrodes S are formed only in areas corresponding to the red filters among the color filters 11, red is displayed in the display area. Segment electrodes S are formed in areas corresponding to the green or blue filters and then green or blue is displayed in the display area. Thus, display electrodes are formed corresponding to one kind of color selecting members and when the display electrode is applied with a voltage, light is transmitted through a liquid crystal layer 23; and the color selecting members select one predetermined color for the transmitted light and the predetermined color is displayed in the display area. Consequently, the display quality is improved.

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.

BACKGROUND ART FIG. 9 is a plan view of a conventional segment type liquid crystal display element 30. A plurality of segment electrodes 33 are arranged on the liquid crystal display element 30 so as to form Japanese characters. Further, a color filter colored red, for example, is provided in the area A1, a green color filter is provided in the area A2, and a blue color filter is provided in the areas A3 to A5.

FIG. 10 is a cross-sectional view of the liquid crystal display element 30.

The liquid crystal layer 37 is interposed between the glass substrates 31a and 31b, and is sealed with a sealing resin 38. A plurality of segment electrodes 33 are formed on the surface of the liquid crystal layer 37flil of the glass substrate 31a, and an alignment film 3 is further formed on the segment electrodes 33.
4a is formed. Liquid crystal layer 37 on glass substrate 3Ib
A plurality of common electrodes 32 are formed on the side surface, and an alignment film 34b is further formed thereon. Glass substrate 31a.

Polarizing plates 35a and 35b are provided on the surface of 31b opposite to the liquid crystal layer 37, respectively. The aforementioned red, green, and blue color filters 36 are formed on the polarizing plate 35a in a region including the segment electrodes 33 by a printing method or the like.

FIG. 11 is a sectional view showing another configuration of the liquid crystal display element 30. Here, in order to eliminate color shift due to parallax in the display area, the color filter 36 is formed on the common electrode 32 by an electrodeposition method, a printing method, or the like.

In such a liquid crystal display element 30, the segment voltage [! 33, by applying a voltage between the electrode corresponding to the display area to be displayed and the common electrode 32, light is transmitted through the liquid crystal layer corresponding to the segment electrode to which the voltage is applied, and a red display is displayed. It can be carried out. In other areas 7-2-A5, green display and blue display can be performed using the same method.

Further, in the liquid crystal display device disclosed in US Pat. No. 3,840,695, color filters are arranged on the front and rear surfaces of the liquid crystal display element, and only one color can be displayed in one unit display area.

In general, since liquid crystals have wavelength dependence, the light-shielding property of the liquid crystal display element 30 is not perfect, and light cannot be blocked over the entire visible wavelength range. When displaying (the background color is white and the display color is black), light passes through the liquid crystal layer 37 even when no voltage is applied to the liquid crystal layer 37, and the area A1 in FIG. 7 described above turns red. Since it is colored and appears to be distinguished from other parts, there is a problem in that the display quality of the liquid crystal display element 30 deteriorates. In addition, in the case of negative display (background color is black and display color is white), the light-shielding property of the liquid crystal layer 37 is not perfect, so even when no voltage is applied, the shape of the color filter 36 can be seen through, resulting in poor display quality. There is a problem of deterioration.

In addition, the display color of the display area is determined by the color type of the color filter during manufacturing of the liquid crystal display device, so
It is not possible to display the same display area in different colors, resulting in poor display diversity and versatility.

A liquid crystal display device to solve the above-mentioned problems was developed in Japanese Patent Application Laid-open No. 6
0-260921, JP-A-61-239220, and JP-A-62-091917.

■Unexamined Japanese Patent Publication No. 60-260921 By setting the stripe direction of each stripe filter formed on the segment electrode in one direction and arranging them, a color display pattern with a uniform pattern width can be observed from any direction. do.

A set of segment electrodes formed on the upper substrate is divided into segment electrodes with a large pattern width and segment electrodes with a small pattern width. Blue and green stripe filters are formed on the top, and a red stripe filter is formed on the segment electrode with a small pattern width, and the blue filter, green filter, and red filter are arranged in the same vertical direction over all the segments. Form by repeating in order. On the lower substrate, a common electrode with a small pattern width is formed opposite to the blue filter, and a common electrode with a wide pattern width is formed opposite to the green filter and red filter, and these electrodes are appropriately combined to apply a predetermined voltage. By applying this voltage, a display having a uniform pattern width can be obtained.

(1) JP-A-61-239220 One transparent electrode is formed in the shape of a stripe, red, green, and blue color filters are alternately arranged thereon, and the other transparent electrode is formed in the shape of lit characters. The display color of the non-lit segment portion becomes the same color as the display area other than the segment portion. This improves the contrast and improves visibility. Japanese Patent Application Laid-Open No. 62-091917 By disposing color filters of multiple colors on the entire surface including the electrodes on the electrode substrate on which the pattern display electrodes are formed, the background color can be almost changed. Use the same color to make the display pattern easier to see.

On the surface of the upper substrate on which the segment electrodes are formed, a color filter is arranged on the entire surface including the segment electrodes, which is formed by sequentially repeating stripe filters of three colors of blue, green, and red in the vertical direction. . That is, color filters similar to those on the segment electrodes are formed also on the glass plate on which no segment electrodes are present on the inner surface of the upper substrate.

According to such a configuration, the non-lit segment portions of the segment electrodes on the display surface have substantially the same color, making it difficult to distinguish between them, so that display patterns such as numbers can be easily seen.

Problems to be Solved by the Invention In a color liquid crystal display device in which color filters are arranged in a stripe (band-like) arrangement as described above, the degree of mixing of the colors of the displayed image and the clarity of the displayed colors of the image decrease. There is a problem that display quality deteriorates.

An object of the present invention is to provide a color liquid crystal display device that can perform color display without deteriorating display quality.

Means for Solving the Problems The present invention comprises a pair of light-transmitting substrates provided with a liquid crystal layer in between, and a plurality of light-transmitting substrates provided over the entire surface of one side in the thickness direction of the light-transmitting substrates to predetermine transmitted light. a plurality of color selection members each selecting one of the types of colors; and a plurality of color selection members provided in a display area on the liquid crystal layer side of the transparent substrate, each of which corresponds to a predetermined color to be displayed in the display area. The color liquid crystal display device is characterized in that it includes a display electrode having translucency formed in a range corresponding to the plurality of color selection members to be selected.

Further, the present invention is characterized in that the color selection members have a rectangular shape and are arranged in a mosaic pattern, and the display electrodes corresponding to the color selection members that select the same color are sequentially connected.

According to the present invention, on one side in the thickness direction of a pair of light-transmitting substrates provided with a liquid crystal layer in between, a plurality of colors are provided on one side in the thickness direction of the pair of transparent substrates, each of which selects one of a plurality of predetermined colors for transmitting light. A color selection member is provided over the entire surface, and a display electrode having translucency is provided in a display area on the liquid crystal layer side of the translucent substrate in a manner corresponding to a predetermined color to be displayed in the display area. It is formed in a range corresponding to the plurality of color selection members to be selected.

Further, the color selection members have a rectangular shape and are arranged in a mosaic pattern, and display electrodes corresponding to color selection members that select the same color are sequentially connected.

Therefore, by forming the display with poles corresponding to one type of color selection member and applying a voltage to the display electrodes, light can be transmitted through the liquid crystal layer.

This transmitted light is selected as one predetermined color by a color selection member, and thereby the predetermined color is displayed in the display area. At this time, further different colors can be displayed in the display area by forming display electrodes individually corresponding to multiple types of color selection members and combining multiple types of colors selected by the color selection members.

In addition, since the color selection member is provided over the entire surface of the transparent substrate, even if there is light leakage from the liquid crystal layer when no voltage is applied to the display electrodes, the color liquid crystal display device The color is the same over the entire surface, that is, the color is a combination of colors selected by each color selection member, and it is prevented that only a portion has a different color, thereby improving display quality.

Further, since the color connecting members are arranged in a mosaic pattern, when a plurality of types of colors are combined, the degree of mixing of the displayed colors when viewed visually is greatly improved.

Embodiment FIG. 1 is a plan view of a liquid crystal display device 10 which is an embodiment of the present invention. In the liquid crystal display device 10, a color filter 11, which is a color selection member, is provided over the entire surface of a glass substrate 21a, which will be described later. The color filter 11 is
It is formed by arranging red, green, and blue filters in a mosaic pattern.

In FIG. 1, the red filter is designated with the reference number R, the green filter is designated with the reference number G, and the blue filter is designated with the reference number B. The sizes of filters R, G, and H are so minute that they cannot be discerned with the naked eye.

- As an example, rectangular filters R, G, B with a length in the longitudinal direction L1 = 330 μm and a length in the width direction L2 = 80 μm are used, and the spacing L3 between the filters is chosen to be 30 μm. Therefore, the area formed by the three types of filters R, G, and B lined up in the width direction A2 of the filter is 330 μm.
It will be a square of m x 330 μm.

The spacing L3 between filters is determined by the manufacturing accuracy of color filters such as photo process, and is generally 15μ.
m to 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.

The liquid crystal display device 10 also includes segment electrodes S, which will be described later.
and a common electrode 12 are provided.

FIG. 2 is a cross-sectional view of the liquid crystal display device 10.

The liquid crystal layer 23 is a transparent glass substrate 21a.

21b, and is sealed with a sealing resin 24. The thickness of the liquid crystal layer 23 is selected to be 4 μm to 30 μm, and 5 μm to 10 μm for boat fishing. Liquid crystals include T.N. (Twisted Nematic) liquid crystals and S.N.
(Super Twisted Neportic;
Super-7 Isted Nematic) liquid crystal is used.

On the surface of the liquid crystal layer 23fQl of the glass substrate 21a, the color filter 11 described above is provided over almost the entire surface by a printing method or an electrode coloring method.
A plurality of segment electrodes S are formed on l. The color filter 11 may be formed either inside the liquid crystal display device 10 or outside (for example, polarizing plates 25a and 25b described later).
(above), but in order to eliminate color shift due to parallax in the display area, it is preferable to use the inner part.Furthermore, an alignment film 22a is formed on the segment electrode S.

In addition, in FIG. 2, the color filter 11 is a glass substrate 21.
Although the color filter 11 is interposed between the glass substrate 21b and the segment electrode S, the color filter 11 may be interposed between the glass substrate 21b and the common electrode 12.

Further, the color filter 11 is placed between the segment electrode S and the alignment film 22a, or between the common electrode 12 and the alignment film 22b.
It may be interposed between.

As one of the present embodiments, the segment electrode S is shown in FIG.
), the segment electrodes Sr are formed only in the area corresponding to the red filter R of the color filter 11 in the display area, and each segment electrode Sr is connected to each other by a transparent electrode 26r as a signal line. A plurality of common electrodes 12 are formed on the surface of the glass substrate 21b on the liquid crystal layer 23 side over an area including the display area corresponding to the segment electrodes S, and an alignment film 22b is formed thereon. Further, on the surface of the glass substrates 21a and 21b opposite to the liquid crystal layer 23,
Polarizing plates 25a and 25b are provided, respectively.

In FIG. 3<1), for example, the segment electrode Sr formed in the region corresponding to the red filter R is connected to the transparent electrode 2.
Although it is stated that it is electrically connected by 6r,
On the glass substrate 21a, a plurality of quadrilateral color filters R, G, and B of three colors, red, green, and blue, are arranged in a mosaic pattern. tf! This is a color liquid crystal display device in which transparent electrodes are arranged so that they are connected in sequence.

An example of this is shown in FIG. 3(2). In FIG. 3(2), segment electrodes Sr, Sb, and Sg correspond to the red filter R, blue filter B, and green filter G of the color filter 11 in the display area. The segment electrodes Sr, Sb, and Sg are transparent electrodes 26r as signal lines.

26b and 26g, respectively.

Using this connection method, red, yellow, green,
Seven colors, turquoise, blue, white, and violet, can be displayed within the target display area.6 FIG. 4 is a block diagram showing the electrical configuration of the liquid crystal display device 10. In the liquid crystal display device 10, segment electrodes 81 to S7, which are a plurality of display electrodes, are arranged to form Japanese characters. Here, segment electrodes S1 to S7
A case will be explained in which the red filter R is formed only in the area corresponding to the red filter R as shown in FIG. 3(1). Further, the common electrode 12 is arranged in an area including the display area corresponding to the segment electrodes 81 to s7. Segment electrodes 81 to S7 are connected to segment electrode drive circuit 14 via signal lines 11 to 17, respectively, and common electrode 12 is connected to common electrode drive circuit 15 via line 18. The signal lines 11 to 18 are provided so as not to affect the display. Segment tIXfi drive circuit 14 and common electrode drive circuit 15 are connected to display control circuit 16 and apply voltages to segment electrodes 81 to S7 and common electrode 12 based on image information provided from display control circuit 16.

The liquid crystal layer 23 to which a voltage is applied transmits light in the case of normally black display, so the segment voltages 8isl~
Of S7, the display area corresponding to the electrode to which the voltage is applied transmits light. Here, as described above, since the segment electrodes S are formed only in the area corresponding to the red filter R of the color filter 11, red is displayed in the display area. At this time, although the light shielding property of the liquid crystal display device 10 is not perfect in areas other than the display area to which the voltage is applied, and light may leak, the color filter 11 covers the entire surface of the glass substrate 21a. Because of this, the shape of the color filter 11 does not show through or only the part where the color filter 11 is provided does not appear colored, unlike in the conventional case, and the light transmitted through the liquid crystal layer 23 does not Since white light is produced by mixing the three colors of red, green, and blue light, areas other than the display area are prevented from being colored.

As described above, according to this embodiment, the shape of the color filter 11 is not seen through, and areas other than the display area are prevented from being colored due to light leakage. This significantly improves the display quality of the liquid crystal display device 10.

In this embodiment, the segment electrodes S are formed in the area corresponding to the red filter R, but by forming the segment electrodes S in the area corresponding to the green filter G or the blue filter B, the display area is filled with green or Blue color is displayed.

Further, the segment electrodes S may be provided individually corresponding to the two color filters.

In this case, for example, if segment electrodes S are individually provided in regions corresponding to the red filter R and the green filter B, a yellow display can be performed by mixing red light and green light. In addition, when segment electrodes S are provided on the red filter R and blue filter B, magenta color display can be performed, and when segment electrodes S are provided on the green filter G and blue filter B, cyan color display can be performed. It can be carried out. Furthermore, white display can also be performed by providing electrodes for all three color filters.

Furthermore, by adjusting the electrode width of the transparent electrode 26 connecting the segment electrodes S, the resistance value of the transparent electrode 26 can be changed, and by changing the voltage applied to the liquid crystal layer 23, two intermediate colors can be displayed.

In this embodiment, the color filter 11 is formed by filters of three colors, red, green, and blue, but the color filter 11 may be formed by selecting two desired colors from the three colors. In addition, the filters are red, green,
The filters are not limited to the three colors of 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, 4
The color filter 11 may be formed using more than one color filter.

FIG. 5 is a diagram showing another arrangement order of color filters R, G, and B and a connection order of segment electrodes. In FIG. 5, for the sake of clarity, only the connection method of the segment electrodes related to the red filter R is illustrated.
Of course, the connection methods for the green filter G and the blue filter B are also the same. The above-mentioned FIG. 3 shows the case where the red filters R are connected diagonally and linearly,
FIGS. 5(1) to 5(3) show cases in which segment electrodes corresponding to respective common colors, for example, red color filters R, are connected in a zigzag pattern. In the case of Figure 3 (2), the connection is diagonal, whereas in the case of Figure 5 (1)
) to FIG. 5(3), the connection is generally in a straight line direction, and the connection between the electrodes is easier. In the cases of Fig. 5 (2) and Fig. 5 (3), unlike the case of Fig. 5 (1), the arrangement order of the color filters R, G, and B is slightly different, but overall is a straight line connection.

In FIG. 5(1), filters R, G, and B have a 3×6 matrix M1 as a basic unit, and this matrix M1 is arranged in a matrix. In FIG. 5(2), filters R, G, and B have a 3×4 matrix M2 as a basic unit, and this matrix M2 is arranged in a matrix. In FIG. 5(3), filters R, G, and B use a 3×6 matrix M3 as a basic unit, and this matrix M3 is arranged in a matrix.

FIG. 6 is a diagram showing still another arrangement order of color filters R, G, and B and a connection order of segment electrodes;
The color filters R, G, and B are arranged in a delta arrangement. In the case of Fig. 6 (1), the connection is diagonal, but
In the case of FIG. 6(2), the connection is generally in a straight line.

FIG. 7 is a diagram showing another example of electrode arrangement within the display screen of the liquid crystal display device 10. In FIG. 7, four dot matrix arrays (for example, LCD display @),
Examples are shown of a 4 m Japanese-shaped array, a one-layer geometric pattern, and two design figure arrays.

At the upper part of the display screen 17, square electrodes 41 are arranged in an 8×8
Four electrode groups 42 are arranged in a matrix. In the center of the display screen 17, an electrode group 43 having a length of 4 m is arranged in which rectangular segment electrodes S as described above are arranged to form a Japanese character. An electrode 44 formed in a shape corresponding to a geometric pattern is arranged at the lower part of the display screen 17, and electrodes 45 and 46 formed in a shape corresponding to a design figure representing a plant leaf are arranged. has been done.

A plurality of quadrilateral color filters R, G, and B arranged in a fine mosaic of red, green, and blue are arranged in the display area and the background area, and segment electrodes corresponding to common colors are sequentially connected. Transparent electrodes are arranged so as to

A plurality of quadrilateral color filters R, G, and B are arranged in the arrangement order shown in FIGS. 5 and 6. The driving method will be explained using one of the Japanese-shaped segment electrodes as an example. (This corresponds to the 1-segment electrode surrounded by the dotted circle in FIG. 7.) FIG. 8 is a schematic diagram for explaining the electrode driving method. The color filter arrangement shown in FIG. 5(1) is used. The segment electrode S includes segment electrode portions Sa and Sb.
, Sc.

It is divided into several display areas as shown in FIG.
101r, 1101b, and 1101g are arranged. Connecting line groups 1101r, 11 of these segment electrodes
01b, 1101g: 1102r, 1102b, 110
2g; 1103r, l 103b, 1103g;- is
M is electrically controlled by a segment electrode drive circuit 14. These connection line groups 1101r, 1102r,
R103r, . . . are driven with a display color corresponding to a preset electrode arrangement. For example, the display area corresponding to the segment electrode portion Sa may be displayed in red, the display area corresponding to the segment electrode portion sb may be displayed in blue, and the display area corresponding to the segment electrode portion Sc may be displayed in green, or the above three colors may be displayed. The display color may be a mixed color.

Effects of the Invention As described above, according to the present invention, a plurality of color selection members are provided over the entire surface of the transparent substrate, so that the display electrodes formed within the display area can be matched to the desired color selection members. In other words, by separately providing display ti corresponding to multiple types of color selection members, it is possible to display a display area in a desired color.6 In other words, by providing individual display ti corresponding to multiple types of color selection members, it is possible to combine multiple types of colors. This also makes it possible to display a color in the display area that is different from the color selected in advance by the color selection member.

In addition, since the color selection member is provided over the entire surface of the transparent substrate, even if light leaks from the liquid crystal layer in an area other than the display area to which voltage is applied, the color selection member is provided over the entire surface of the transparent substrate. Since the area is colored by a combination of colors selected by each color selection member, it is prevented that only a specific area is colored as in the past, and the display quality of the color liquid crystal display device is significantly improved.

Furthermore, since the color selection members are arranged in a mosaic pattern, when a plurality of colors are combined, the degree of mixing of the displayed colors when viewed visually is greatly improved.

[Brief explanation of drawings]

FIG. 1 is a plan view of a liquid crystal display device 10 which is an embodiment of the present invention, FIG. 2 is a cross-sectional view of the liquid crystal display device 10, FIG. 3 is a plan view of a segment electrode S, and FIG. 4 is a plan view of the liquid crystal display device 5 is a diagram showing the arrangement order of color filters R, G, B and the connection order of segment electrodes. FIG. 6 is a block diagram showing the electrical configuration of color filters R1G, B and the segment electrodes. Diagram showing the connection order of electrodes, No. 7
8 is a diagram for explaining a method for driving the electrodes shown in FIG. 7, and FIG. 9 is a plan view of a conventional liquid crystal display element 30. , 10th
This figure and FIG. 11 are cross-sectional views of a conventional liquid crystal display element 30. 10...Liquid crystal display device, 11 - Color filter, 1
2 Common electrode, 21a, 21b...Glass substrate, 23
・Liquid crystal layer, 81-S7... segment electrode, R red filter, G... green filter, B... blue filter

Claims (1)

[Scope of Claims] A pair of light-transmitting substrates provided with a liquid crystal layer in between, and one of a plurality of colors provided over the entire surface of one side in the thickness direction of the light-transmitting substrates to predetermine transmitted light. a plurality of color selection members each selecting one color; and a plurality of color selection members provided in a display area on the liquid crystal layer side of the transparent substrate and selected corresponding to a predetermined color to be displayed in the display area. 1. A color liquid crystal display device comprising: a display electrode having translucency formed in a range corresponding to the color selection member;