JP3147512B2 - Electro-optical device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
To an electro-optical device.

[0002]

2. Description of the Related Art Hitherto, several proposals have been made on a method of forming a color filter, a material of a flattening layer and the like, and a forming method. As a method of forming a transparent electrode on a color filter, Japanese Patent Application Laid-Open Nos.
233720 and JP-A-61-260224 have been proposed. Prior art and Japanese Patent Application Laid-Open No. Sho 62-12
By combining an optical display cell proposed in Japanese Patent Publication No. 1701 and an electro-optical device for large-capacity display by combining an optical anisotropic body and a large-capacity display, an electro-optical device having a large display capacity and capable of high-quality color display can be obtained. Proposed. However, when the display capacity is increased, since the electro-optical device uses time-division driving, the effective voltage decreases due to electrical resistance due to the wiring resistance of the waveform applied to the display unit and the capacitance of the liquid crystal layer and the like. It is known that the display characteristics deteriorate.
Therefore, a method as disclosed in JP-A-63-273834 has been proposed.

[0003]

However, in the former prior art described above, when the present invention is applied to an electro-optical device which performs display in a matrix arrangement of row and column electrodes, the duty at the time of dynamic driving is increased in order to increase the capacity. In order to increase the number, a display transparent electrode must be formed on the color filter to prevent the effective voltage from lowering. However, since most of the color filter and the flattening layer are formed of an organic resin, for example, when indium oxide-tin oxide (hereinafter, ITO) is formed by a vacuum deposition method or a sputtering method, the color filter and the flattening layer are formed. Due to wrinkles and other damage, the substrate temperature cannot be raised to the level of a normal glass substrate, and the specific resistance can be reduced only to about 1.5 × 10 ⁻⁴ Ω · cm. There is a limit in reducing the wiring resistance to a desired value by itself. Therefore, the latter method has been proposed, but has essentially the same problem. For this reason, a method of reducing the wiring resistance by installing a thin wiring made of metal on or below the display transparent electrode has been used.However, the aperture ratio of the display unit is reduced to improve the display quality. However, it was not enough. In addition, on the metal layer, by a color filter forming method, in particular, a method of forming by a photolithographic method using a photosensitive resin in which a pigment is dispersed, or a method in which a resin in which a pigment is dispersed is used as a resist with another photosensitive resin. In the patterning method used, a resin layer that is difficult to develop tends to remain on the metal layer, and there is a problem that it is extremely difficult in manufacturing to form an insulating layer and secure stable electrical connection with the metal layer. I was

[0004] The present invention is intended to solve such problems, and an object thereof is to provide an electro-optical device using a color filter, that is particularly improved the image quality of large electro-optical device display capacity Aim.

[0005]

According to the present invention, there is provided an electro-optical device comprising: a plurality of color filters; and a plurality of display electrodes provided at positions overlapping each of the plurality of color filters in a plane. In the optical device, one of the two adjacent color filters is also formed between the two display electrodes that overlap with each of the two color filters in a plane, and the two adjacent color filters are formed. A light-shielding layer adjacent to each of the two color filters is provided between the color filters, and the light-shielding layer is electrically connected to the display electrode overlapping the other of the two color filters in a plane. Are connected to each other and are provided so as to overlap the one color filter formed between the two display electrodes. And butterflies. Further, a flattening layer is provided between the color filter and the display electrode. Further, the flattening layer includes a film selected from an inorganic film and an organic resin film. The plurality of color filters and the plurality of display electrodes are provided in a stripe shape.

An electro-optical device according to another embodiment of the present invention includes two substrates disposed so as to face each other, and one of the two substrates has a plurality of color filters and a plurality of the plurality of color filters. In an electro-optical device having a plurality of display electrodes provided at positions overlapping with each of the color filters in a plane, and the other substrate having a plurality of counter electrodes, one of the two color filters adjacent to each other is provided. A filter is also formed between the two display electrodes overlapping the two color filters in a plane, and a light-shielding layer adjacent to each of the two color filters is provided between two adjacent color filters. Has,
The light-shielding layer is electrically connected to the display electrode that planarly overlaps the other color filter of the two color filters, and is connected to the one color filter formed between the two display electrodes. The light shielding layer is provided so as to overlap, and is electrically connected to the display electrode at a position other than a position where the display electrode and the counter electrode overlap in a plane.

[0007]

According to the present invention, as described above, one of the two adjacent color filters is
2 which overlaps each of the two color filters in a plane
And the light-shielding layer is electrically connected to the display electrode that overlaps the other color filter of the two color filters in a plane, and the light-shielding layer is formed between the two color filters. Provided so as to overlap the one color filter formed between the two display electrodes. As a result, the resistance can be reduced, so that an effect of preventing the electric drive waveform from being rounded and lowering the contrast and eliminating crosstalk is produced. Further, there is an effect that light incident between two adjacent display electrodes is absorbed by the light shielding layer. In particular, since the color filter formed between the display electrodes and the light-shielding layer overlap with each other, it is possible to prevent light leakage at a portion where the color filter is formed between the display electrodes. As a result, an electro-optical device having good contrast characteristics and good color purity during color display is realized.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to embodiments. It goes without saying that the electro-optical device and the manufacturing method of the present invention are not limited to the configurations shown in the respective embodiments below. The display portion has a color filter pitch of 100 μm on the color filter side, a transparent electrode for display on the color filter having a width of 75 μm, and a gap between the electrodes of 25 μm. 2000 angstroms film thickness of ITO, width of 275 μm with sheet resistance of 5Ω / □, gap between electrodes 2
400 lines were formed at 5 μm. The wiring resistance of the display is 4
kΩ. For the alignment treatment, a well-known conventional method of rubbing polyimide is applied, but not only the one that is twisted by the alignment treatment but also one that is aligned (not twisted) in parallel with the substrate, a ferroelectric liquid crystal Can be applied even in the case where is used, and is not limited to the embodiments described below. Further, in the case of the twist orientation, the twist angle is not limited, but from 90 ° to 3 ° in view of contrast, display characteristics and manufacturing stability.
60 ° is desirable. However, there is no limitation on the torsion angle, so that application is possible with less than 90 ° or more than 360 °. In this example, the twist angle was set to 230 ° to the left, and the thickness of the liquid crystal layer (hereinafter, cell gap) was set to 7.0 μm.
In the present invention, the color filter is a pigment based on heat resistance and uses three primary colors of red (hereinafter R), green (hereinafter G) and blue (hereinafter B) to obtain general color purity (color). Degree) and transmittance (lightness), the thickness of each color was set to 1.5 to 2.5 μm. However, when the heat resistance is not limited by the forming method of each material, it goes without saying that there is no problem even if the dye system is applied. The manufacturing method is not limited by the color filter and the flattening layer. Needless to say, there is no restriction on the method of forming the metal layer and the combination of materials.

First Embodiment A description will be given with reference to FIG. A color resist in which red, green, and blue pigments are dispersed in an ultraviolet-curable resin is applied to the glass substrate 1, and the exposure-development process is repeated three times, and the color filters 2 are adjacent to each other with a width of 95 μm. Have a film thickness of 1.
It was formed with a thickness of 2 μm. Next, the film was formed on the color filter by a low-temperature magnetron sputtering method at a film forming temperature of 180 ° C.
A transparent conductive film made of TO was formed to a thickness of 1000 angstroms, and a display transparent electrode 3 was formed on the color filter 2 by a photolithographic method. At this time, the display transparent electrode 3 was formed on one side of the color filter 2 by face contact. Next, 15 μm is applied to adjacent color filters at a position corresponding to each color filter.
A light-shielding layer 4 made of chrome-gold was formed in a stripe shape with a width. At this time, at a position that does not overlap with the counter electrode, the stripe-shaped portion protrudes from the stripe-shaped portion to a width 30 wider than the gap between the display transparent electrodes.
forming an electrical connection portion 5 μm, and forming the display transparent electrode 3
To cross each other to secure electrical connection. The light-shielding layer 4 thus formed is connected to the adjacent display transparent electrode by 10 μm.
This means that m intervals are open. However, it goes without saying that the interval can be set from the relationship between the display characteristics and the processing accuracy. Chromium and gold of the light shielding layer 4 are approximately 500 angstroms of chromium and approximately 1000
After the continuous angstrom film formation, patterning was performed using a photolithography method. Chromium is cerium ammonium nitrate,
Gold was each etched with iodine-potassium iodide. FIG. 2 is a structural diagram viewed from AA ′ in FIG. 1, and FIG.
It is the figure which showed the structure seen from B '. Next, the structure of the electro-optical device of the present invention will be described with reference to FIG. The counter electrode 7 is formed on the glass substrate 6 in the same manner as the glass substrate 1 shown in FIG. Thereafter, an alignment film 8 was formed at 300 to 400 angstroms using polyimide. After bonding the substrates 1 and 6 with the seal 9, the liquid crystal 11 was sealed through the gap material 10. In this embodiment, when the resistance of the display portion on each color as the substrate including the display transparent electrode 3 described above was measured, it was 4 kΩ. The electro-optical device and the transparent electrode on the color filter without a light-shielding layer are displayed by using the same electro-optical device except that the low-temperature magnetron sputtering method is the same as 2000 angstrom (surface resistance 20 Ω / □) and the wiring resistance of the display unit is 25 kΩ. As a result, the electro-optical device produced by the method of this embodiment was able to obtain high quality without crosstalk. Further, the electro-optical device created in this embodiment is
No change for 300 hours in a constant temperature and constant humidity test at 50 ° C-90 RH%, and no change in image quality and image corrosion for 250 hours in a constant temperature and constant temperature and humidity test at 50 ° C-90RH% to obtain good stability. I was able to do things. The display transparent electrode 3 and the light shielding layer 4
The display transparent electrode 3 may be formed after the light-shielding layer 4 is formed first, contrary to the one shown in the first embodiment.

Embodiment 2 This will be described with reference to FIG. After forming a color filter 2 on a glass substrate 1 in the same manner as in Example 1, an epoxy acrylate resin is coated with a 1.2 μm-thick film by spin-coating by imparting ultraviolet-curing photosensitivity, and then flattened by ultraviolet irradiation. Layer 12 was formed. 6 shows the structure of FIG. 5 as viewed from AA ′, and FIG. 7 shows the structure of FIG. 5 as viewed from BB ′. Next, a light-shielding layer 4 and a display transparent electrode 3 were formed in the same manner as in Example 1. Using the substrate 1 with the color filter described in the second embodiment, an electro-optical device was prepared by combining the substrate 1 with the counter substrate 6 via the seal 9 as shown in FIG. At this time, the planarizing layer 1
Reference numeral 2 denotes a seal 9 in this embodiment so that the cell thickness can be easily controlled.
However, it goes without saying that the same result can be obtained both inside and outside the seal 9. When the electro-optical device produced in this manner was evaluated for image quality such as crosstalk in the same manner as in Example 1, it was possible to obtain the same good results as in the case of crosstalk, and also to obtain good results in terms of stability. Was.

Although described through Embodiments 1 and 2, the structure of the present invention can be applied to other color filter forming methods (for example, an electrodeposition method, a method of dispersing a pigment in printing ink to form a color filter by, for example, an offset printing method, A method in which a pigment is dispersed in a substrate such as a polyimide resin and a color filter is patterned using a photoresist, etc.), and a material made of another material (eg, a thermosetting melamine resin, an epoxy resin, a silicone resin) as a flattening layer. ,
There is no restriction on the forming method.

[Embodiment 3] The light-shielding layer 4 of the substrate described in Embodiments 1 and 2 is selectively patterned by electroless plating after nickel is patterned by vacuum evaporation and gold is patterned by photolithography. A color filter and a transparent electrode for display were prepared in the same manner, except that they were deposited on nickel and formed in the same film thickness as in Example and Example 2. A glass bead was used as the gap material 10 and the cell gap was set to 2 μm. Ferroelectric liquid crystal was injected and the pulse width and refresh driving frequency were changed to confirm the display. The pulse width was about 60 μs and the refresh driving frequency was about 20 Hz.
Responded with good waveform saturation. In contrast to the electro-optical device of the present embodiment, the electro-optical device having the conventional structure in which the light-shielding layer made of a metal layer is not formed has a pulse width of about 250 μs and a refresh driving frequency of about 8 Hz, and a display with a noticeable flicker is obtained. As described above, a ferroelectric liquid crystal display device with good color display can be manufactured.

Embodiment 4 The structure of an electro-optical device according to Embodiment 4 will be described with reference to FIG. The electro-optical device described in the second embodiment was used as a display cell and an S cell for performing optical switching. In this embodiment, the same birefringence (cell gap: d and refractive index anisotropy of liquid crystal or optically anisotropic substance: Δn) as an optically anisotropic substance as the S cell: Δn × d = 0. 9, Δn = 0.129)
And a liquid crystal cell was disposed between the polarizers 14 and 15 so that the S cell could be optically compensated. In this embodiment, the liquid crystal cell is d = 8 μm, Δn = 0.
113. Here, the angle between the alignment directions of the surfaces where the S cell and the liquid crystal cell are in contact with each other is preferably in the range of 70 ° to 110 °, and more preferably 90 °. In this embodiment, 9
0 °. The angle between the polarization axis of each polarizer and the alignment direction on the side where the S cell and the liquid crystal cell are in contact with each other is 2
The value of the birefringence and the refractive index dispersion used in the present embodiment is 0 ° to 50 °, and the condition for black when not lit and white when fully lit is 45 °. However, whether the axis of change with respect to the alignment direction is right or left when viewed from above the electro-optical device is a difference between positive and negative. In this embodiment, the change is made negative.

However, as described above, the optical anisotropic material has the same effect as long as it has the same birefringence as the S cell. For example, a stretched polymer film such as polyvinyl alcohol or polycarbonate is used. No restrictions are imposed. When the image quality was evaluated by displaying the electro-optical device prepared in this manner, a high-quality color display with good black-and-white coloring was obtained.

Fifth Embodiment With respect to the structure described in the first, second, and third embodiments, it is expected that the signal input method will be further miniaturized in accordance with the future increase in display capacity. For example, a method of connecting a tape in which a drive driver is mounted on a flexible tape to a glass substrate via an anisotropic conductive adhesive is reduced, and a metal layer (for example, aluminum, Gold) and connecting it to the driver mounting substrate using wire bonding technology, or mounting the drive driver directly on the glass substrate (generally called COG) As shown in FIG. 10, the light-shielding layer 4 shown in the second embodiment is extended to a portion other than the display portion, and a portion without a color filter is used for a display portion between a normal signal input terminal portion and a display portion. The wiring portion and the signal input terminal portion 15 were connected to the transparent electrode 3 and the light-shielding layer 4 was used as it was. When wire bonding was performed on the signal input terminal portion 15 using a gold wire, a favorable eutectic bonding state could be confirmed. In addition, although COG mounting was performed, in the case of a normal electro-optical device, a molding process or a simple molding process is performed on a portion in a liquid crystal cell and a method of observing an input of a driving driver bar and an output of a substrate side. Substrate at 60 ° C-90R
A good result could be obtained without any problem for 250 hours in an H% constant temperature / humidity standing test. In the structure described above, the metal system can be selected according to the mounting method.

[0016]

As described above, according to the present invention, there is provided the present invention, wherein one of the two adjacent color filters is one of the two display electrodes overlapping the two color filters in a plane. And the light-shielding layer is electrically connected to the display electrode that planarly overlaps with the other color filter of the two color filters, and the light-shielding layer is formed between the two display electrodes. Provided so as to overlap with the one color filter formed on the substrate, thereby reducing the wiring resistance, preventing the electric drive waveform from being rounded, and lowering the contrast and eliminating crosstalk. be able to. Further, light incident between two adjacent display electrodes can be absorbed by the light shielding layer. In particular, since the color filter formed between the display electrodes and the light-shielding layer overlap with each other, it is possible to prevent light leakage at a portion where the color filter is formed between the display electrodes. As a result, an electro-optical device having good contrast characteristics and good color purity during color display is realized.

[Brief description of the drawings]

FIG. 1 is a structural diagram of a substrate with a color filter shown in Embodiment 1 of the present invention.

FIG. 2 is a structural view of the substrate with a color filter shown in Example 1 of the present invention as viewed from the AA ′ section.

FIG. 3 is a structural view of the substrate with a color filter shown in Example 1 of the present invention as viewed from a cross section BB ′.

FIG. 4 is a structural diagram of the electro-optical device shown in Embodiment 2 of the present invention.

FIG. 5 is a structural diagram of a substrate with a color filter shown in Embodiment 2 of the present invention.

FIG. 6 is a structural diagram of the substrate with a color filter shown in Example 2 of the present invention, as viewed from a cross section AA ′.

FIG. 7 is a structural diagram of the substrate with a color filter shown in Example 2 of the present invention as viewed from a cross section BB ′.

FIG. 8 is a structural view of the electro-optical device shown in Embodiment 2 of the present invention.

FIG. 9 is a configuration diagram of an electro-optical device shown in Embodiment 4 of the present invention.

FIG. 10 is a structural diagram of a substrate with a color filter shown in Embodiment 5 of the present invention.

[Explanation of symbols]

 1. Glass substrate 2. Color filter 3. 3. Transparent electrode for display Light shielding layer 5. Electrical connection part 6. Glass substrate 7. 7. Counter electrode Alignment film 9. Seal 10. Gap material 11. Liquid crystal 12. Planarization layer 13. Polarizer 14. Polarizer 15. Signal input terminal

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G02F 1/1335 G02F 1/1343

Claims (5)

(57) [Claims] 1. An electro-optical device comprising: a plurality of color filters; and a plurality of display electrodes provided at positions overlapping each of the plurality of color filters in a plane. One of the color filters is also formed between the two display electrodes overlapping the two color filters in a plane. Each of the two color filters is located between two adjacent color filters. And the light-shielding layer is electrically connected to the display electrode that planarly overlaps the other color filter of the two color filters, and the two display electrodes An electro-optical device, wherein the electro-optical device is provided so as to overlap the one color filter formed therebetween. 2. The electro-optical device according to claim 1, wherein a flattening layer is provided between the color filter and the display electrode. 3. The electro-optical device according to claim 2, wherein the flattening layer includes a film selected from an inorganic film and an organic resin film. 4. The electro-optical device according to claim 1, wherein the plurality of color filters and the plurality of display electrodes are provided in stripes. Optical device. 5. A semiconductor device comprising: two substrates disposed so as to face each other, and one of the two substrates is provided at a position overlapping a plurality of color filters and each of the plurality of color filters in a plane. An electro-optical device having a plurality of display electrodes provided thereon, and the other substrate having a plurality of counter electrodes, wherein one of the two adjacent color filters is in plane with each of the two color filters. It is also formed between two overlapping display electrodes, and between the two adjacent color filters, a light shielding layer adjacent to each of the two color filters is provided. The two color filters are electrically connected to the display electrode overlapping the other color filter in a plane, and are formed between the two display electrodes. The light-shielding layer is electrically connected to the display electrode at a position other than a position where the display electrode and the counter electrode overlap in a plane. An electro-optical device characterized by the above-mentioned.