JPS63228131A - Liquid crystal display device for color display - Google Patents

Abstract

PURPOSE:To improve the opening rate of a color display image by alternately disposing color filters of respective colors above and below respective lower electrodes. CONSTITUTION:The plural upper, lower electrodes 3, 4 are formed in a band shape respectively orthogonally with each other on the opposite surfaces of light transmittable upper and lower substrates 1, 2 which are disposed to face each other. The color filters 6R, 6G, 6B of the respective colors are alternately disposed above and below the lower electrodes 4. Then, the picture elements, each one of which is constituted of one lower electrode 4 and color filter 6 on the lower substrate 2, can be disposed in tight contact with each other without forming spacings for insulation with each other. The opening rate of the display in the vertical direction of the display image is thereby improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color display liquid crystal display device having a color filter within a liquid crystal display element.

[Conventional technology]

FIG. 3 is a diagram showing an example of a color display liquid crystal display device of this woodcutter; FIG. 3(a) is a plan view of the main part, and FIG. , the same figure (c) is the same figure (a)
FIG. In the figure, a plurality of upper electrodes 3 and a plurality of lower electrodes 4 made of transparent conductive films are respectively deposited in a band shape orthogonal to each other on the opposing surfaces of an upper substrate 1 and a lower substrate 2 made of transparent glass plates. A liquid crystal alignment film 5 whose surface has been subjected to a rubbing treatment is formed on the surfaces on which the upper electrode 3 and the lower electrode 4 are formed, and furthermore, the lower electrode 4 is formed.
Above, for example, there are three color filters 6R, 6G, red, green, and back.
, 6B are sequentially and repeatedly formed and arranged, and
The upper substrate 1 and the lower substrate 2 are separated by a predetermined distance and their peripheries are sealed with a sealing material 7 containing a spacer to form an envelope. (Tw
A liquid crystal display element 9 is constructed by enclosing a liquid crystal 8. Further, an upper polarizing plate 10 is provided on the outer surface of the liquid crystal display element 9, and on the outer surfaces of the upper substrate 1 and the lower substrate 2, with polarization axes or absorption axes parallel to each other.
and a lower polarizing plate 11 are adhesively arranged to form a color liquid crystal display device.

In the color display liquid crystal display device configured in this way, for example, in the case of red display, by applying a predetermined voltage between the signal electrode on which the red filter 6R is formed and the scanning electrode, the optical display of the TN liquid crystal 8 is controlled. By changing the optical properties, that is, by transmitting the light incident on the liquid crystal portion corresponding to the red filter 6R, it can be recognized as a red display pattern from the upper substrate 1 side. Furthermore, a green display pattern and a blue display pattern can be displayed in the same manner. Furthermore, for white display, red color filter 6R, green color filter 6
This is possible by simultaneously applying a predetermined voltage between the signal electrodes and scanning electrodes corresponding to the G and blue color filters 68. In this way, many colors can be displayed by combining each color.

[Problem that the invention seeks to solve]

However, in a color display liquid crystal display device constructed in this manner, in order to electrically insulate adjacent lower electrodes 4 formed on the lower substrate 2, the electrodes are separated by means such as an etching method. Since there is an insulating gap with a portion removed, there is a problem in that when viewing a color display image from the front side, the area ratio (aperture ratio) of the so-called effective display image area that is displayed in color becomes small. .

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide a color display liquid crystal display device that can improve the aperture ratio of color display images.

[Means for solving problems]

In the color liquid crystal display device according to the present invention, lower electrodes are alternately arranged above and below a color filter.

[For production]

In the present invention, by alternately arranging color filters of each color above and below each lower electrode, an insulating gap between each lower electrode becomes unnecessary.

〔Example〕

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

FIG. 1 is a diagram showing an embodiment of a color display liquid crystal display device according to the present invention.
BB@ cross-sectional view of ), the same figure (e) is C-C of the same figure value)
It is a cross-sectional view of ff1, and parts that are the same as or correspond to those in the previous figure are given the same reference numerals. In the figure, a plurality of upper electrodes 3 are formed on an upper substrate 1 in one direction (lateral direction).
A transparent insulating film 12 made of, for example, 5ins is formed on top to protect these upper electrodes 3.
On the lower substrate 2 facing the lower substrate 2, a plurality of lower electrodes 4 are formed in the other direction (vertical direction) in a band shape with predetermined intervals, and these lower electrodes 4 have a constant repetition period. Color filters SR, 6G, and 6B of each color are alternately formed and arranged at the upper and lower portions. That is, lower electrodes 4 corresponding to the lower layers of the red color filter 6R and blue color filter 6B are formed and arranged, and lower electrodes 4 corresponding to the upper layer thereof are formed and arranged to the green color filter 6G. Further, the upper and lower portions of each lower electrode 4 are arranged as red color filters 6R.

The blue color filter 6B and the green color filter 6G may be reversed. Incidentally, such a lower electrode 4 can be easily formed by a vapor deposition method or a sputtering method used in the formation of a normal transparent conductive film. Further, the color filters 51 SR, 60, and 68 of each color can be easily formed by a screen printing method, a vapor deposition method, a dyeing method, etc., which are used for forming ordinary color filters. In addition, this kind of color filter 6R of various colors
, 6G, and 6B may be organic or inorganic, but at least the material of the green color filter 6G in the portion on which the lower electrode 4 is formed as shown in FIG. It is preferable to use an inorganic material that can withstand heat.

According to such a configuration, the color filters 6R of each color,
By forming and arranging the lower electrodes 4 alternately at the upper and lower parts of 60 and 6B, one pixel each composed of one lower electrode 4 and one color filter 6 on the lower substrate 2 forms an insulating gap with each other. Since they are arranged closely together without being overlapping, it is possible to improve the aperture ratio of the vertical display of the displayed image.

FIG. 2 is a diagram showing another embodiment of the color liquid crystal display device according to the present invention, in which (a) is a plan view and ('b) is a cross-sectional view taken along line B-B in (a). , the same figure (c) is the same figure (a)
It is a cross-sectional view taken along the line CC of FIG. In the same figure, different color filters 6 are placed on the lower substrate 2, different from those in FIG. 1.
On the upper substrate 1 facing each of the lower electrodes 4 formed alternately on the upper and lower parts of R, 6G, and 6B, each upper electrode 3 has a transparent insulating film 12 interposed between each of the lower electrodes 4 facing each other. They are arranged at positions where the distances are approximately the same. In other words, the upper electrodes 3 are also alternately formed on the upper and lower parts of the transparent insulating film 12.

According to such a configuration, the upper electrodes 3 formed in the lateral direction of the upper substrate 1 do not form an insulating interval with each other.
Since they are closely arranged, the aperture ratio of the display image in the horizontal direction is improved, and together with the improvement of the aperture ratio of the vertical display by the lower electrode 4, the aperture ratio of the combined display image can be increased to approximately 100%. It is possible to obtain high-quality color display images of each color. Furthermore, in addition to the lower electrode, the upper electrode may also have a structure in which electrodes are alternately arranged above and below the color filter in the same way as the lower electrode.

〔Effect of the invention〕

As explained above, according to the present invention, a plurality of upper and lower electrodes are formed in a strip shape perpendicularly to each other on the opposing surfaces of the light-transmitting upper and lower substrates arranged oppositely, and above and below the lower electrodes. By arranging the color filters of each color alternately, there is no need for an insulating gap between the lower electrodes, so the aperture ratio is increased and a bright and clear color image can be obtained, which is an extremely excellent effect.

[Brief explanation of drawings]

FIGS. 1(a), 1(b), and 1(c) are plan views of essential parts of an embodiment of a color liquid crystal display device according to the present invention. A cross-sectional view taken along line B-B in FIG. 2(a), a cross-sectional view taken along line C-C in FIG. 2(a), and FIGS. A plan view of main parts showing other embodiments of the device, a sectional view taken along line B-B in FIG.
Cross-sectional view taken along line C-C in figure (a), Figure 3 values), (b
) and (c) are plan views of essential parts of a conventional color liquid crystal display device. They are a cross-sectional view taken along the line BB in FIG. 3(a), and a cross-sectional view taken along the line CC in FIG. 1... Φ upper substrate, 2... e lower substrate, 3... upper electrode, 4... lower electrode, 5... liquid crystal alignment film, 6R...
...Red color filter, 6G...Green color filter, 6B...me Blue color filter, 71111
@@Sealing material, 8-φ...TN liquid crystal, 9...-1 liquid crystal display element, 10...upper polarizing plate, 11... lower polarizing plate, 12...-fist transparent insulating film. Patent applicant: Koito Seisakusho Co., Ltd. Representative: Masaki Yamakawa (and 2 others) Figure 3 (b) Owner (c)

Claims (1)

[Claims] an upper substrate having a plurality of upper electrodes formed in a strip shape; a lower substrate having a plurality of lower electrodes arranged in a strip shape and facing the upper substrate and perpendicular to the upper electrodes; Alternatively, in a color display liquid crystal display device comprising at least color filters of each color formed and arranged in a repeating manner on the bottom, and a liquid crystal sealed between the upper and lower substrates, each of the lower electrodes has a color filter of each color. A color display liquid crystal display device characterized in that color filters are alternately arranged above and below.