JP3254421B2 - Liquid crystal display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display having no thin film active element .

[0002]

2. Description of the Related Art In a conventional liquid crystal display device, a liquid crystal cell in which liquid crystal is sandwiched between two substrates on which electrodes are formed is provided.
There are a liquid crystal display device having a thin film active element such as a TFT and an MIM in each pixel of the liquid crystal cell, and a liquid crystal display device having no thin film active element in each pixel of the liquid crystal cell.

In a liquid crystal display device having thin-film active elements such as TFTs and MIMs, multi-layer wirings having different patterns are provided, electrode surfaces and between the patterns are covered with protective films, and thin-film active elements such as TFTs and MIMs are formed of sodium. Since the characteristics are easily deteriorated by the influence of ions and the like, a non-alkali glass substrate is used to prevent the influence. As described above, in a liquid crystal display device having a thin film active element, a process for forming the thin film active element is important, and a high-cost neutral borosilicate glass or non-alkali glass substrate must be used. Expensive.

On the other hand, in a liquid crystal display device having no thin film active element, since there is an STN mode of simple matrix drive, there is no need for a process for forming a thin film active element, and in order to prevent elution of alkali ions into the liquid crystal. SiO ₂
A soda-lime glass substrate on which a film is formed can be used, and the cost is low.

In recent years, it has been required to reduce the resistance of the electrodes in order to increase the size of the display unit. As such electrodes, for example, Ag-based metal electrodes such as Japanese Patent Laid-Open Publication No. 09-230806 are disclosed. An electrode having the same has been proposed.

Further, as a portable display device, in order to brighten the display, in a configuration using one polarizing plate or a reflection type liquid crystal display device not using a polarizing plate, a metal electrode serving as both a reflecting plate and an electrode is placed below. A configuration in which a reflection plate is disposed in a liquid crystal cell formed on a side substrate has been proposed. As a material for the metal electrode, the wiring has a low resistance, and
There are Al-based and Ag-based materials which are metals having high reflectivity (for example, Japanese Patent Application Laid-Open No. 07-134300, and Japanese Patent Application Laid-Open No. 08-179252).

[0007]

However, in the electrode portion, electromigration may occur between adjacent electrode patterns on the same substrate. The electromigration is a disconnection of the thin film wiring caused by electrophoresis, and is a phenomenon mainly caused by energization (especially energization in a high temperature and high humidity environment). That is, it can be said that electromigration is a phenomenon that occurs due to the presence of three things, that is, a voltage difference, ions due to dirt and the like, and moisture between adjacent electrode patterns.
In the liquid crystal display device, in order to display various things,
It is necessary to provide a voltage difference between adjacent electrode patterns,
Also, dirt may adhere to the exposed portions of the electrodes of the liquid crystal cell. For this reason, in order to suppress electromigration, it is necessary to suppress the presence of moisture between adjacent electrode patterns.

In a liquid crystal display device having a thin-film active element such as a TFT or MIM, after the electrode pattern is formed, a barrier effect against moisture between the electrode patterns is large.
By providing an insulating protective film such as N, the presence of moisture between adjacent electrode patterns can be suppressed, and electromigration can be suppressed.

However, in a liquid crystal display device having no thin film active element, an S electrode is required to prevent the elution of alkali ions into the liquid crystal.
Since the soda lime glass substrate on which the iO ₂ film is formed is used, the SiO ₂ film is exposed between the adjacent electrode patterns, and since the SiO ₂ film easily absorbs water, electromigration is prevented. There is a problem that it easily occurs.

In order to improve the problem of the liquid crystal display device having no thin-film active element, there is a configuration in which the exposed portions of the electrodes are covered with a resin. There is a problem that the electromigration resistance is still insufficient with respect to the infiltrated moisture or the moisture permeated from the resin.

An object of the present invention is to provide a liquid crystal display device having a highly reliable electromigration resistant electrode pattern formed on a substrate without a thin film active element.

[0012]

In order to solve the above-mentioned problems, a first invention (corresponding to claim 1 ) comprises an upper substrate on which an electrode pattern having no thin-film active element is formed by a transparent electrode; The lower substrate on which an electrode pattern having no thin-film active element is formed by the reflective electrode, and the alignment films formed on the respective electrodes of the upper substrate and the lower substrate face each other, and the upper substrate and the lower substrate are opposed to each other. A liquid crystal cell having a liquid crystal sandwiched between the substrate and a resin covering an exposed part of an electrode of the liquid crystal cell connecting the electronic component for driving the liquid crystal cell and the liquid crystal cell; of the lower substrate, the material of at least the lower substrate Sodarai
Glass, and a SiN film is formed on its surface.
And the electrode pattern is formed on the SiN film.
And the material of the reflective electrode of the electrode pattern is
Al alloy, and alloy components other than Al of the Al alloy are
Zr, Ti and Ta, all or a part thereof;
When the content of alloy components other than l is 0.1 at% to 5 at%
There is provided a liquid crystal display device.

[0013]

[0014] The second of the present invention (Claim 2 corresponds), the resin of the first <br/> liquid crystal display device of the present invention is a liquid crystal display device, characterized in that an acrylic resin.

In the liquid crystal display device of the present invention having the above-described structure, the presence of water between adjacent electrode patterns is achieved by providing the electrode pattern on the SiN insulating protective film having a large barrier effect against water. , The electromigration resistance can be improved.

Further, in the liquid crystal display device of the present invention, since the exposed portion of the electrode of the liquid crystal cell for connecting to the electronic component is covered with the resin, the electromigration resistance between the electrode surface and the electrode pattern of the exposed electrode portion is obtained. Sex is further improved.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention and
A reference example will be described with reference to FIGS.

( Reference Example ) FIG. 1 is a sectional view of a liquid crystal display device of a reference example . The liquid crystal display device of the reference example is a transmission type liquid crystal display device. In FIG. 1, 1 is a polarizing plate, 2 is a polymer film, 3 is an upper substrate, 14 is an alignment film, 5 is a transparent electrode, 17 is a liquid crystal, 18 is a seal, 6 is a lower substrate, 7 is a SiN film, 22 Denotes an acrylic resin, 23 denotes an anisotropic conductive adhesive, 24 denotes a TAB tape carrier, 25 denotes an LSI chip, and 26 denotes a printed circuit board.

FIG. 2 shows a transparent electrode 5 on the upper substrate 3 of FIG.
FIG. 4 is a cross-sectional view of a state where a is formed. The material of the upper substrate 3 is soda lime glass. The SiN film 7 is formed on the upper substrate 3 and prevents elution of the alkaline substance from the soda lime glass of the upper substrate 3 into the liquid crystal. 31 is an ITO film, 32 is an Ag alloy film, 33 is an ITO film,
These ITO film 31, Ag alloy film 32 and ITO film 3
Reference numeral 3 denotes a three-layer film transparent electrode 5 as shown in the transparent electrodes 5a to 5e in FIG. The three-layer transparent electrode 5
Is an ITO on the upper substrate 3 on which the SiN film 7 is formed.
A film, an Ag alloy film and an ITO film 33 are sequentially stacked,
After a transparent multilayer film having a layer structure is formed, it is formed by patterning an electrode.

A lower substrate 6 is formed in the same manner as the upper substrate 3 described with reference to FIG.

As described above, the transparent electrode 5 is formed on each of the upper substrate 3 and the lower substrate 6, and a 5 wt% solution of N-methyl-2-pyrrolidinone of polyimide is printed thereon.
After curing at 0 ° C., an alignment film 14 was formed by performing an alignment treatment by a rotary rubbing method using rayon cloth so as to realize a 250 ° twist STN mode liquid crystal.

The peripheral portion on the upper substrate 3 is 5.5
A thermosetting sealing resin mixed with 1.0 wt% of glass fiber having a diameter of μm is printed, and 5.0 μm is formed on the lower substrate 6.
m beads are sprayed at a rate of 200 beads / mm ² , and the upper substrate 3 and the lower substrate 6 are bonded to each other.
After the sealing resin is cured at 50 ° C., a liquid crystal 17 in which a predetermined amount of chiral liquid crystal is mixed into an ester-based nematic liquid crystal of ΔnLC = 0.16 is vacuum-injected, sealed with an ultraviolet curable resin, and then irradiated with ultraviolet light. Cured.

The upper substrate 3 of the liquid crystal cell thus formed
Outside, a polymer film 2 made of polycarbonate
Was pasted, and the polarizing plate 1 was further pasted. Further, the polarizing plate 1 was attached to the outside of the lower substrate 6.

Next, as the electronic components for driving the liquid crystal cell, a printed board 26 on which the electronic components are mounted and a TAB tape carrier 24 on which an LSI chip 25 is mounted are used. Connect the transparent electrode 5 of the liquid crystal cell and the TAB tape carrier 2
4 were connected via an anisotropic conductive adhesive 23.

Further, an exposed portion of the transparent electrode 5 to which an electronic component for driving the liquid crystal cell is connected via an anisotropic conductive adhesive 23 is connected to a TUFFY (TF11) manufactured by Hitachi Chemical Co., Ltd.
41) was coated with the acrylic resin 22.

In this way, a transmissive liquid crystal display device capable of changing and displaying achromatic colors from black to white by a simple matrix drive with a duty ratio of 1/240 was obtained.

The transparent electrode 5 of such a liquid crystal display device
In order to examine the electromigration resistance and the corrosion resistance, as a comparative example, two substrates on which the SiN film of the liquid crystal display device of the first embodiment was formed were made of SiO ₂
A liquid crystal display device was prepared in place of the soda lime glass substrate on which the film was formed.

The liquid crystal display device having the transparent electrode 5 formed on the SiN film 7 of the reference example and the liquid crystal display device having the transparent electrode formed on the SiO ₂ film of the comparative example have a temperature of 60.
Under an environment of a temperature of 90 ° C. and a humidity of 90% RH, the liquid crystal display device was subjected to a power-on test of 500 h to evaluate the electromigration resistance of the transparent electrode. That is, for example, the electromigration resistance between the transparent electrode 5a and the transparent electrode 5b and between the transparent electrode 5c and the transparent electrode 5d in FIG. 2 was evaluated. As a result, in the liquid crystal display device in which the transparent electrode was formed on the SiO ₂ film, the disconnection occurred in the transparent electrode.
In the liquid crystal display device in which the transparent electrode 5 was formed on the N film, no disconnection occurred in the transparent electrode 5, and no other abnormality was observed. Therefore, the transparent electrode 5 on the SiN film 7
It was found that the electromigration resistance was improved as compared with the transparent electrode on the iO ₂ film.

In the above-mentioned reference example , a transparent multilayer film having a three-layer structure of an ITO film 31, an Ag alloy film 32, and an ITO film 33 was used as the transparent electrode 5, but a single-layer ITO film, Other transparent conductive films may be used.

In the above embodiment , the upper substrate 3 and the lower substrate 6 are made of soda-lime glass, but non-alkali glass or a liquid crystal film may be used instead of the soda-lime glass.

In the above-mentioned reference example , the exposed portion of the transparent electrode 5 between the electrode portion to which the electronic component for driving the liquid crystal cell is connected and the display portion is covered with the acrylic resin 22.
The exposed portion of the transparent electrode 5 may be covered with another resin such as a silicon resin. However, as a resin to be coated, an acrylic resin having an effect of suppressing water penetration is desirable from the viewpoint of improving electromigration resistance.

Further, in the above reference example , a reflection type liquid crystal display device for monochrome display is used as an example of the liquid crystal display device. However, a reflection type liquid crystal display device for color display using a color filter is used as the liquid crystal display device. You may. Also,
In the above reference example , an STN mode liquid crystal was used. However, as a substitute for the STN mode liquid crystal, a TN mode or PCGH
A liquid crystal display device having a configuration in which a polarizing plate, a polymer film, or the like is adjusted to the liquid crystal mode using another liquid crystal mode such as a mode may be used.

Further, in Embodiment 2 below,
The components having the same configuration as the reference example are denoted by the same reference numerals.

Embodiment 1 FIG. 3 is a sectional view of a liquid crystal display device according to Embodiment 1 .
The liquid crystal display of the first embodiment is a reflection type liquid crystal display. In FIG. 3, 10 is a polarizing plate, 11 is a polymer film, 12 is a scattering film, 13 is an upper substrate, 14 is an alignment film, 8 is a SiO ₂ film, 7 is a SiN film, 15 is a color filter, and 21 is an acrylic type. A flat layer of resin, 16 is a transparent electrode, 17 is a liquid crystal, 18 is a seal, 19 is a lower substrate, 2
0 is an Al alloy electrode, 22 is an acrylic resin, 23 is an anisotropic conductive adhesive, 24 is a TAB tape carrier, and 25 is L
The SI chip 26 indicates a printed circuit board.

FIG. 4 is a sectional view showing a state in which an Al alloy electrode 20 is formed as a metal reflective electrode on the lower substrate 19 of FIG. The material of the lower substrate 19 is soda lime glass. The SiN film 7 is formed on the lower substrate 19 and prevents elution of the alkali substance from the soda lime glass of the lower substrate 19 into the liquid crystal. Then, an aluminum alloy film was laminated on the lower substrate 19 by 2000 ° to form an electrode pattern, and as shown in FIGS. 4A to 4E, a single-layer film mirror-reflection type metal reflective electrode was obtained. Note that no thin-film active elements such as transistors are formed on the lower substrate 19.

The upper substrate 13 is made of soda-lime glass.
_{The two} films, the color filter 15 and the acrylic resin 22 were laminated, and the transparent electrode 16 was formed on the flat layer 21 of the acrylic resin using indium tin oxide (ITO). Note that no thin-film active elements such as transistors are formed on the upper substrate 13.

As described above, the upper substrate 13 and the lower substrate 19
And N-methyl-2-polyimide
After printing a 5 wt% solution of pyrrolidinone and curing it at 200 ° C., an orientation film 14 was formed by performing an orientation treatment by a rotary rubbing method using rayon cloth so as to realize a 250 ° twist STN mode liquid crystal. Then, a thermosetting sealing resin containing 1.0 wt% of glass fiber having a diameter of 6.0 μm is printed on a peripheral portion of the upper substrate 13, and resin beads having a diameter of 5.0 μm are printed on the lower substrate 19. Are sprayed at a rate of 200 / mm ² , the upper substrate 13 and the lower substrate 19 are adhered to each other, the sealing resin is cured at 150 ° C., and then a predetermined amount is applied to an ester-based nematic liquid crystal having ΔnLC = 0.16. Liquid crystal 17 mixed with an amount of chiral liquid crystal was vacuum injected, sealed with an ultraviolet curable resin, and then cured with ultraviolet light.

The upper substrate 1 of the liquid crystal cell thus formed
On top of 3, No. 3, a scattering film 12 having a scattering direction of 0 ° to 50 ° as measured from the film normal was bonded, which is a forward scattering film (trade name: Lumisty) manufactured by Sumitomo Chemical Co., Ltd. Polycarbonate was adhered thereon as the polymer film 11. The polymer film 11 is composed of two polymer films having different slow axes, the polymer film on the liquid crystal cell side has a retardation of 0.3 μm, and the slow axis is oriented with respect to the orientation direction of the upper substrate 13. 90 °, and the upper polymer film has a retardation of 0.5μ.
m, the slow axis is at 45 ° to the orientation direction of the upper substrate 13. Further, a neutral gray polarizing plate (SQ-1852 manufactured by Sumitomo Chemical Co., Ltd.) is used as the polarizing plate 10.
AP) that had been subjected to anti-glare (AG) treatment was attached such that the absorption axis coincided with the lower slow axis of the polymer film 11.

Next, as the electronic components for driving the liquid crystal cell, a printed board 26 on which the electronic components are mounted and a TAB tape carrier 24 on which an LSI chip 25 is mounted are used. The electrodes of the liquid crystal cell were connected to the TAB tape carrier 24 via the anisotropic conductive adhesive 23.

Further, the exposed part of the electrode between the electrode part and the display part where the electronic parts for driving the liquid crystal cell are connected via the anisotropic conductive adhesive 23 is made by a TU manufactured by Hitachi Chemical Co., Ltd.
It was coated with FFY (TF1141) acrylic resin 22.

As described above, in the simple matrix drive with a duty ratio of 1/240, an achromatic black display with a low reflectance, an achromatic white display with a high reflectance, and an achromatic black display from black to white. A color reflective liquid crystal display device in a normally black mode capable of changing display was obtained.

In order to examine the electromigration resistance and corrosion resistance of the Al alloy electrode 20 as the metal reflective electrode of such a liquid crystal display device, as a comparative example, the SiN film 7 of the liquid crystal display device of the second embodiment was used. A liquid crystal display device was prepared using a soda lime glass substrate on which an SiO ₂ film was formed instead of the formed lower substrate 19.

Then, A is formed on the SiN film 7 of this embodiment.
The reflection type liquid crystal display device having the l-alloy electrode 20 formed thereon and the reflection type liquid crystal display device having the Al alloy film electrode formed on the SiO ₂ film of the comparative example were subjected to reflection at a temperature of 60 ° C. and a humidity of 90% RH. An electric conduction test of the liquid crystal display device was performed for 500 hours, and the electromigration resistance of the Al alloy electrode was evaluated. That is, for example, the Al alloy electrode 2 shown in FIG.
0a and the Al alloy electrode 20b,
The electromigration resistance between d and the Al alloy electrode 20e was evaluated. As a result, Al on the SiO ₂ film
In the reflective liquid crystal display device in which the alloy electrode was formed, disconnection occurred in the Al alloy electrode. However, in the reflective liquid crystal display device in which the Al alloy electrode 20 was formed on the SiN film 7, the disconnection occurred in the Al alloy electrode 20. No occurrence and no other abnormalities were observed. Therefore, the Al alloy electrode 20 on the SiN film 7
Was found to have improved electromigration resistance over the Al alloy electrode on the SiO ₂ film.

Next, as components other than Al of the metal reflective electrode of the reflective liquid crystal display device according to the first embodiment of the present invention, Z
For an Al alloy containing one of each of r, Ti, and Ta from 0 at% to a content exceeding 5 at%,
Electromigration resistance and corrosion resistance as metal reflective electrodes, reflectance, and specific resistance were examined.

The metal reflective electrode of such an Al alloy has 0
An Al alloy target containing at least one of Zr, Ti, and Ta from at% to more than 5 at% was applied to a soda lime glass substrate on which a SiN film 7 was formed by DC magnetron sputtering to form an Al alloy film at a thickness of 2000 mm. It was created by stacking and forming an electrode pattern. The sample thus prepared was used as a sample of a metal reflection electrode of a specular reflection type of an Al single layer film. Then, PCT (Pressure Cooke
r Test: temperature 105 ° C, pressure 1.2atm, humidity 100
% RH) to evaluate the corrosion resistance of the film. As a result, P
In the surface observation after 60 hours of CT, the content of the alloy other than Al was 0 at%, that is, the surface of the metal reflective electrode made of pure Al was discolored, but the content of the alloy other than Al was 0.1 a.
Above 5 at% from t%, no abnormalities on the surface were observed. Therefore, Zr, Ti, Ta
It has been found that the metal reflective electrode prepared by adding 0.1 at% or more has improved corrosion resistance.

Further, in the configuration of the reflection type liquid crystal display device shown in FIG. 3 using the above-mentioned metal reflection electrode, an energization test 500 h of the reflection type liquid crystal display device was carried out in an environment of a temperature of 60 ° C. and a humidity of 90% RH. Then, the electromigration resistance of the metal reflective electrode was evaluated. As a result, the alloy content is 0a
In the case of the metal reflective electrode of t%, that is, pure Al, the metal reflective electrode was disconnected, but the content of the alloy was 0.1 at%.
In cases where the ratio exceeds 5 at%, no disconnection occurred in the metal reflective electrode, and no other abnormalities were observed. Therefore, it was found that a metal reflective electrode formed by adding Zr, Ti, and Ta to Al at 0.1 at% or more has improved electromigration resistance.

As described above, Zr, Ti,
A metal reflective electrode formed by adding 0.1 at% or more of Ta improves electromigration resistance and corrosion resistance. Therefore, a reflective liquid crystal display device including such a metal reflective electrode has high reliability. It will be. The effect of improving the electromigration resistance and corrosion resistance is such that Zr, Ti,
Two or more of Ta are added simultaneously, and the total amount is 0.1a.
It can be obtained even in the case of a metal reflective electrode made by using a material exceeding 5 at% from t%.

Next, with respect to the above-mentioned sample of the above-mentioned metal reflective electrode, the reflectance of light at a wavelength of 555 nm with high visibility and the specific resistance were measured by a four-probe method. FIG. 5 shows the measurement result of the reflectance, and FIG. 6 shows the measurement result of the specific resistance.

As shown in FIG. 5, as the content of Zr, Ti, and Ta increases, the reflectance decreases.
As shown in the figure, it was found that the specific resistance increased with an increase in the content of Zr, Ti, and Ta. In particular, Z
It was found that when the content of r, Ti, and Ta exceeded 5 at%, the reflectance decreased sharply and the specific resistance increased sharply. Therefore, in order to obtain a reflective liquid crystal display device having a metal reflective electrode (display electrode portion) having a low resistance and a small resistance variation and having a high reflectance, Zr,
It is understood that the content of Ti and Ta is preferably up to 5 at%. This effect can be obtained even when two or more of Zr, Ti and Ta are simultaneously contained and the total amount thereof is up to 5 at%.

Therefore, from the results described above, it can be seen that Al
The alloy preferably contains at least one of Zr, Ti and Ta as an alloy component in an amount of 0.1 at% to 5 at%. A reflection type liquid crystal display device provided with a metal reflective electrode made of such an alloy is In addition, the electromigration resistance and the corrosion resistance are improved, the resistance as a wiring is low, and the reflectance of the metal reflective electrode (display electrode portion) is high.

In the first embodiment, a single-layer film made of an Al alloy is used as the metal reflective electrode. However, a metal reflective electrode made of a multilayer film such as an Ag alloy film may be used.

In the first embodiment, the upper substrate 1
3 as the transparent electrode 16, a flat layer 21 of an acrylic resin
An indium-tin-oxide ITO film was formed on the upper layer, but an SiN film was formed on an acrylic resin flat layer 21 instead of a transparent electrode, and a transparent conductive film was further formed thereon. May be used.

In the first embodiment, the lower substrate 1
Although the case where the SiN film 7 is formed only on the substrate 9 has been described, both the upper substrate 13 and the lower substrate 19 on which the SiN film is formed may be used. In that case, the SiN
An electrode pattern will be formed on the film.

In the first embodiment, the upper substrate 1
Although the third substrate 19 and the lower substrate 19 are made of soda-lime glass, non-alkali glass or a liquid crystal film may be used instead of the soda-lime glass.

In the first embodiment, the acrylic resin 22 covers the exposed portion of the electrode between the electrode portion to which the electronic component for driving the liquid crystal cell is connected and the display portion.
The exposed portion of the electrode may be covered with another resin such as a silicon-based resin. However, as a resin to be coated, an acrylic resin having an effect of suppressing water penetration is desirable from the viewpoint of improving electromigration resistance.

In the first embodiment, the reflection type liquid crystal display device for color display is used. However, a reflection type liquid crystal display device for monochrome display may be used.

Further, the liquid crystal display device of the first embodiment can use the TN mode or the PC even if the STN mode liquid crystal is used.
Other liquid crystal modes such as a GH mode may be used, and a structure in which a polarizing plate, a polymer film, or the like is adjusted to the liquid crystal mode may be employed.

[0058]

As is apparent from the above description, according to the liquid crystal display device of the present invention, by providing an electrode pattern on a SiN insulating protective film having a large barrier effect against moisture, an adjacent electrode is provided. The presence of moisture between the patterns can be suppressed, and the electromigration resistance can be improved.

Further, in the electrode of the liquid crystal cell having the above-mentioned structure according to the present invention, the exposed portion of the electrode to which the electronic component is connected is covered with a resin, so that the exposed surface of the electrode exposed portion and the resistance between the electrode patterns can be improved. A liquid crystal display device with improved electromigration properties can be obtained. It is preferable to use an acrylic resin as a resin for covering the exposed portions of the electrodes to which such electronic components are connected.

The metal reflective electrode of the reflective liquid crystal display device is preferably an Al alloy single-layer film, and at least one of Zr, Ti, and Ta is used as an alloy component at 0.1 at.
% To 5 at%, the electro-migration resistance and corrosion resistance of the Al alloy material itself of the metal reflective electrode are improved, and a reflective liquid crystal display device having a low resistance as a wiring and a high reflectance of a display electrode portion is provided. Obtainable.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a liquid crystal display device of a reference example .

FIG. 2 is a cross-sectional view of a liquid crystal display device of a reference example in a state where a transparent electrode is formed on an upper substrate.

FIG. 3 is a cross-sectional view of the liquid crystal display device of Embodiment 1 .

FIG. 4 is a cross-sectional view showing a state where a metal reflective electrode is formed on a lower substrate of the liquid crystal display device of Embodiment 1 .

FIG. 5 is a diagram showing the relationship between the content of Zr, Ti, and Ta contained in the Al alloy of the metal reflective electrode used in the first embodiment and the reflectance.

FIG. 6 is a view showing the relationship between the specific resistance and the contents of Zr, Ti, and Ta contained in the Al alloy of the metal reflective electrode used in the first embodiment.

[Explanation of symbols]

1, 10 Polarizing plate 2, 11 Polymer film 3, 13 Upper substrate 5, 5a to 5e, 16 Transparent electrode 6, 19 Lower substrate 7 SiN film 8 SiO ₂ film 12 Scattering film 14 Alignment film 15 Color filter 17 Liquid crystal 18 Seal 20, 20a-20e Al alloy electrode 21 Flat layer of acrylic resin 22 Acrylic resin 23 Anisotropic conductive adhesive 24 TAB tape carrier 25 LSI chip 26 Printed circuit board 31, 33 ITO film 32 Ag alloy film

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-9-146080 (JP, A) JP-A-7-261186 (JP, A) JP-A-54-143246 (JP, A) JP-A 8- 304843 (JP, A) JP-A-1-267517 (JP, A) International Publication 96/8746 (WO, A1) (58) Fields investigated (Int. Cl. ⁷ , DB name) G02F 1/1333 G02F 1 / 1343 G02F 1/1345 G02F 1/1335

Claims (2)

(57) [Claims] An upper substrate on which an electrode pattern having no thin-film active element is formed by a transparent electrode; a lower substrate on which an electrode pattern having no thin-film active element is formed by a metal reflective electrode; A liquid crystal cell in which liquid crystal is sandwiched between the upper substrate and the lower substrate, with an alignment film formed on each electrode of the lower substrate facing each other, an electronic component for driving the liquid crystal cell, and the liquid crystal cell wherein a resin for covering the exposed portion of the electrode of the liquid crystal cell, one of the upper substrate and the lower substrate, the material of at least the lower substrate is a soda lime glass, and SiN on its surface to connect the door film is formed, and further the electrode pattern formed on the SiN film, its
The material of the reflective electrode of the electrode pattern is an Al alloy
And alloy components other than Al of the Al alloy are Zr, T
i or Ta in whole or in part, other than Al
A liquid crystal display device, wherein the content of the alloy component is 0.1 at% to 5 at% . Wherein said resin is a liquid crystal display device according to claim 1 Symbol mounting, characterized in that an acrylic resin.