JP2002328385A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device which can avoid disturbance in an electric field owing to a color filter. SOLUTION: Of two mutually opposing substrates holding liquid crystal therebetween, in a pixel region on the liquid crystal side surface of one substrate, a laminated structure comprising a pixel electrode, an insulating film, and a counter electrode laminated in this order is formed on the liquid crystal. The counter electrode comprises a transparent conductive layer which covers nearly the whole pixel electrode. The pixel electrode comprises a plurality of electrodes, which are superimposed on the counter electrode, extend in one direction, and are disposed side by side in the direction crossing the one direction. The color filter is formed on the side of the one substrate relative to the laminated structure.

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 device, and more particularly to an active matrix type liquid crystal display device called a lateral electric field type.

[0002]

2. Description of the Related Art An active matrix type liquid crystal display device is arranged on a liquid crystal side surface of one of transparent substrates opposed to each other via a liquid crystal, extending in the x direction and juxtaposed in the y direction. A gate signal line to be formed and a drain signal line extending in the y direction and juxtaposed in the x direction are formed, and a region surrounded by each of the signal lines is a pixel region. In each pixel region, a thin film transistor activated by a scanning signal from one gate signal line and a pixel electrode to which a video signal from a drain signal line is supplied via the thin film transistor are formed. And what is called a transverse electric field type is such that a counter electrode for generating an electric field between the pixel electrode and the pixel electrode is formed on the transparent substrate side on which the pixel electrode is formed. The light transmittance of the liquid crystal is controlled by an electric field having a parallel component. On the other hand, on the liquid crystal side surface of the other transparent substrate among the transparent substrates opposed to each other via the liquid crystal, for example, a color filter of a common color is formed in each pixel region juxtaposed in the y direction. The filter is formed by sequentially repeating, for example, red (G), green (G), and blue (B) in the pixel regions arranged in the x direction.

[0003]

However, in such a configuration, in a liquid crystal display device, it has been attempted to form the color filter on the one of the transparent substrates on which the pixel electrodes or the counter electrodes are formed. I have. This is because, when the color filter is formed on the other substrate side, the margin becomes narrower at the time of alignment with one substrate. However, it has been found that when a color filter is formed on one substrate side, if the color filter is not a perfect insulator, it causes disturbance of the electric field applied to the liquid crystal. The lateral electric field type liquid crystal display device uses a small electric field of a component substantially parallel to the transparent substrate in the electric field generated between the pixel electrode and the counter electrode in order to drive the liquid crystal. Then, the electric field is formed stronger on one substrate side where the pixel electrode and the counter electrode are formed. Therefore, when the color filter is formed on the one substrate, the presence of the color filter that causes disturbance of the electric field is relatively larger than when the color filter is provided on the other substrate, and cannot be ignored. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a liquid crystal display device that can avoid disturbance of an electric field due to a color filter.

[0004]

SUMMARY OF THE INVENTION Among the inventions disclosed in the present application, the outline of a representative one will be briefly described.
It is as follows.

[0005] Means 1. According to the liquid crystal display device of the present invention, for example, a pixel electrode, an insulating film, and a counter electrode are laminated from the liquid crystal side to a pixel region on a liquid crystal side surface of one of the substrates arranged to face each other with the liquid crystal interposed therebetween. A body is formed, and the counter electrode is formed of a light-transmitting conductive layer that covers substantially the entire area of the pixel region, and the pixel electrode overlaps with the counter electrode and extends in one direction to extend in the direction. It is composed of a plurality of electrode groups arranged side by side in a direction intersecting with each other, and a color filter is formed on the one substrate side with respect to the laminate.

Means 2. According to the liquid crystal display device of the present invention, for example, a pixel electrode, an insulating film, and a counter electrode are laminated from the liquid crystal side to a pixel region on a liquid crystal side surface of one of the substrates arranged to face each other with the liquid crystal interposed therebetween. And the opposing electrode is formed of a light-transmitting conductive layer that covers substantially the entire pixel area over another adjacent pixel area, and the pixel electrode overlaps the opposing electrode. A plurality of electrode groups extending in one direction and juxtaposed in a direction intersecting the direction, wherein a color filter is formed on the one substrate side with respect to the laminate. It is.

Means 3. According to the liquid crystal display device of the present invention, for example, a pixel electrode, an insulating film, and a counter electrode are laminated from the liquid crystal side to a pixel region on a liquid crystal side surface of one of the substrates arranged to face each other with the liquid crystal interposed therebetween. And the opposing electrode is formed of a light-transmitting conductive layer that covers substantially the entire pixel area over another adjacent pixel area, and the pixel electrode overlaps the opposing electrode. It is composed of a plurality of electrode groups extending in one direction and arranged in a direction intersecting the direction, and a color filter is formed on the one substrate side with respect to the laminate, and the insulating film is The thickness of the region where the pixel electrode is formed is large, and the thickness of the region where the pixel electrode is not formed is small.

Means 4. According to the liquid crystal display device of the present invention, for example, a counter electrode, an insulating film, and a pixel electrode are laminated from the liquid crystal side to the pixel region on the liquid crystal side of one of the substrates arranged to face each other with the liquid crystal interposed therebetween. And the pixel electrode is formed of a light-transmitting conductive layer covering almost the entire pixel region, and the counter electrode extends in one direction so as to overlap the pixel electrode. It is composed of a plurality of electrode groups arranged side by side in a direction intersecting with each other, and a color filter is formed on the one substrate side with respect to the laminate.

Means 5 According to the liquid crystal display device of the present invention, for example, a pixel region surrounded by a pair of gate signal lines and a pair of drain signal lines on a liquid crystal side surface of one of the substrates disposed to face each other with liquid crystal interposed therebetween. From the one substrate side, at least a part of one gate signal line of the pair of gate signal lines is used as a gate electrode, and a drain electrode is connected to one drain signal line of the pair of drain signal lines. A thin film transistor, a protective film formed over the thin film transistor, a color filter, a counter electrode, an interlayer insulating film, and a pixel electrode connected to a source electrode of the thin film transistor through a through hole,
The counter electrode is formed of a light-transmitting conductive layer that covers substantially the entire area of the pixel region, and the pixel electrode overlaps with the counter electrode and extends in one direction and is arranged in a direction intersecting the direction. It is characterized by comprising a plurality of electrode groups provided.

Means 6 According to the liquid crystal display device according to the present invention, for example, a pixel region surrounded by a pair of gate signal lines and a pair of drain signal lines on a liquid crystal side surface of one of the substrates disposed to face each other with liquid crystal interposed therebetween. From the one substrate side, at least a part of one gate signal line of the pair of gate signal lines is used as a gate electrode, and a drain electrode is connected to one drain signal line of the pair of drain signal lines. A thin film transistor, a protective film formed over the thin film transistor, a color filter, a counter electrode, an interlayer insulating film, and a pixel electrode connected to a source electrode of the thin film transistor through a through hole,
The counter electrode is formed of a light-transmitting conductive layer that covers substantially the entire pixel region over another adjacent pixel region, and the pixel electrode extends in one direction so as to overlap the counter electrode. And a plurality of electrode groups arranged in parallel in a direction intersecting the direction.

Means 7. According to the liquid crystal display device of the present invention, for example, a pixel region surrounded by a pair of gate signal lines and a pair of drain signal lines on a liquid crystal side surface of one of the substrates disposed to face each other with liquid crystal interposed therebetween. From the one substrate side, at least a part of one gate signal line of the pair of gate signal lines is used as a gate electrode, and a drain electrode is connected to one drain signal line of the pair of drain signal lines. A thin film transistor, a protective film formed over the thin film transistor, a color filter, a counter electrode, an interlayer insulating film, and a pixel electrode connected to a source electrode of the thin film transistor through a through hole,
The counter electrode is formed of a light-transmitting conductive layer that covers substantially the entire pixel region over another adjacent pixel region, and the pixel electrode extends in one direction so as to overlap the counter electrode. And a plurality of electrode groups arranged in parallel in a direction intersecting the direction, wherein the interlayer insulating film has a large film thickness in a region where the pixel electrode is formed and a film thickness in a region where the pixel electrode is not formed. Is characterized by being formed small.

Means 8. According to the liquid crystal display device of the present invention, for example, a pixel region surrounded by a pair of gate signal lines and a pair of drain signal lines on a liquid crystal side surface of one of the substrates disposed to face each other with liquid crystal interposed therebetween. From the one substrate side, at least a part of one gate signal line of the pair of gate signal lines is used as a gate electrode, and a drain electrode is connected to one drain signal line of the pair of drain signal lines. A thin film transistor, a protective film formed over the thin film transistor, a color filter, a pixel electrode connected to a source electrode of the thin film transistor through a through hole, an interlayer insulating film, and a counter electrode are stacked;
The pixel electrode is formed of a light-transmitting conductive layer that covers substantially the entire area of the pixel region, and the counter electrode overlaps with the pixel electrode and extends in one direction and is arranged in a direction intersecting the direction. It is characterized by comprising a plurality of electrode groups provided.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the liquid crystal display device according to the present invention will be described below with reference to the drawings. Embodiment 1 FIG. << Overall Configuration of Liquid Crystal Display >> FIG. 2 is an equivalent circuit diagram showing one embodiment of the entire liquid crystal display according to the present invention. A pair of transparent substrates SUB arranged to face each other via a liquid crystal
1 and SUB2, and the liquid crystal is on one transparent substrate SUB1.
Is sealed by a sealing material SL which also serves to fix the other transparent substrate SUB2 to the substrate.

A liquid crystal side surface of the one transparent substrate SUB1 surrounded by the sealing material SL has a gate signal line GL extending in the x direction and juxtaposed in the y direction and y extending in the y direction. And drain signal lines DL arranged side by side in the direction.

Each gate signal line GL and each drain signal line D
L constitute a pixel region, and a matrix-like aggregate of these pixel regions is a liquid crystal display unit A.
R.

In each of the pixel regions arranged in parallel in the x direction, a common counter voltage signal line CL running in each of the pixel regions is formed. The counter voltage signal line CL is a signal line for supplying a reference voltage for a video signal to a later-described counter electrode CT of each pixel region.

Each pixel region has a thin film transistor TFT activated by a scanning signal from one of the gate signal lines GL and a pixel electrode to which a video signal from one of the drain signal lines DL is supplied via the thin film transistor TFT. PX is formed.

The pixel electrode PX generates an electric field between the pixel electrode PX and the counter electrode CT to which a reference voltage is supplied, and rotates the liquid crystal molecules by the electric field having a component substantially parallel to the transparent substrate SUB1 of the electric field. And the light transmittance thereof is controlled.

One end of each of the gate signal lines GL extends beyond the sealing material SL, and the extending end forms a terminal to which an output terminal of the vertical scanning drive circuit V is connected. . The input terminal of the vertical scanning drive circuit V is adapted to receive a signal from a printed circuit board arranged outside the liquid crystal display device.

The vertical scanning drive circuit V is composed of a plurality of semiconductor devices. A plurality of gate signal lines adjacent to each other are grouped, and one semiconductor device is assigned to each group.

Similarly, one end of each of the drain signal lines DL extends beyond the sealing material SL, and the extending end forms a terminal to which an output terminal of the video signal driving circuit He is connected. Has become. The input terminal of the video signal drive circuit He is adapted to receive a signal from a printed circuit board arranged outside the liquid crystal display device.

The video signal driving circuit He also includes a plurality of semiconductor devices, and a plurality of drain signal lines DL adjacent to each other are grouped, and one semiconductor device is assigned to each group. I have.

The counter voltage signal line CL common to the pixel regions arranged in parallel in the x direction is commonly connected at the right end in the drawing, and the connection line extends beyond the sealing material SL. , And constitute a terminal at its extending end. From this terminal, a reference voltage for the video signal is supplied.

One of the gate signal lines is sequentially selected by a scanning signal from the vertical scanning circuit V. Further, each of the drain signal lines DL is
The video signal drive circuit He supplies a video signal in accordance with the timing of selection of the gate signal line GL.

<< Pixel Configuration >> FIG. 1 is a plan view showing an embodiment of the pixel region, and corresponds to a portion shown by a circle in FIG. In FIG. 1, a cross section taken along line III-III is shown in FIG. 3, and a cross section taken along line IV-IV is shown in FIG.

In FIG. 1, a pair of gate signal lines GL extending in the x direction and juxtaposed in the y direction are formed on the surface of the transparent substrate SUB1 on the liquid crystal side. These gate signal lines GL surround a rectangular area together with a pair of drain signal lines DL described later, and this area is configured as a pixel area.

On the surface of the transparent substrate SUB1 on which the gate signal lines GL are formed, an insulating film GI made of, for example, SiN is formed so as to cover the gate signal lines GL. The insulating film GI functions as an interlayer insulating film for the gate signal line GL in a region where a drain signal line DL described later is formed, and functions as a gate insulating film in a region where a thin film transistor TFT described later is formed.
In a region where a capacitive element Cstg described later is formed, it functions as a dielectric film.

Then, on the surface of the insulating film GI,
A semiconductor layer AS made of, for example, amorphous Si is formed so as to overlap a part of the gate signal line GL. This semiconductor layer AS is a thin film transistor TFT
By forming the drain electrode SD1 and the source electrode SD2 on the upper surface, an inverted staggered MIS transistor using a part of the gate signal line GL as a gate electrode can be formed.

In this embodiment, the semiconductor layer AS
Are formed so as to extend not only to the formation region of the thin film transistor TFT but also to the intersection of the neighboring gate signal line GL and drain signal line DL. This is because the function as an interlayer insulating film at the intersection of the gate signal line GL and the drain signal line DL is enhanced.

The drain electrode SD1 and the source electrode SD2 of the thin film transistor TFT are formed at the same time, for example, when the drain signal line DL is formed. That is, a drain signal line DL is formed extending in the y direction and juxtaposed in the x direction, and a part thereof is extended to the upper surface of the semiconductor layer AS of the thin film transistor TFT to form a drain electrode SD1. The source electrode SD2 is formed so as to be separated from the drain electrode SD1 by the channel length of the thin film transistor TFT.

The source electrode SD2 slightly extends from the surface of the semiconductor layer AS to the upper surface of the insulating film GI on the pixel region side, and forms a contact portion for connection with a pixel electrode PX described later.

The semiconductor layer AS and the drain electrode SD1
At the interface with the source electrode SD2, a thin layer doped with a high concentration of impurity (for example, phosphorus) is formed, and this layer functions as a contact layer (not shown).

This contact layer is, for example, a semiconductor layer A
At the time of forming S, a high concentration impurity layer is already formed on the surface thereof, and the drain electrode SD1 formed on the upper surface thereof is formed.
And by etching the impurity layer exposed therefrom using the pattern of the source electrode SD2 as a mask.

A protective film PSV made of, for example, SiN is formed on the surface of the transparent substrate SUB1 on which the thin film transistor TFT, the drain signal line DL, the drain electrode SD1, and the source electrode SD2 are formed. This protective film PSV is the liquid crystal L of the thin film transistor TFT.
This film avoids direct contact with C, and prevents the deterioration of the characteristics of the thin film transistor TFT.

The protective film PSV is a channel protect type, that is, a structure in which an inorganic protective film such as SiN is formed on the channel portion of the thin film transistor TFT, or a p-type.
If Si is used as the semiconductor layer, it may be omitted.

The color filter FIL is formed on the upper surface of the protective film PSV. The color filter FIL is formed of, for example, a filter of any one of red, green, and blue in the pixel area, and is formed of, for example, a resin film containing a pigment of the color.

The color filters FIL in the pixel region are common to the color filters FIL in the pixel region group including the pixel region and arranged in the y direction (the colors are the same). The band-shaped color filter FIL formed in this manner is, for example, red in the x direction.
Green, blue, red,... Are sequentially repeated.

Each band-shaped color filter FIL is connected to another adjacent color filter FIL and the drain signal line DL.
It is formed by partially overlapping the above. On the upper surface of the color filter FIL, for example, an ITO film or I
Counter electrode CT made of a light-transmitting conductive film made of a ZO film or the like
Are formed (see FIGS. 3 and 4). This counter electrode C
T is commonly formed not only in the pixel area but also in other adjacent pixel areas in the vertical and horizontal directions.

In other words, it is formed at least over the entire area of the liquid crystal display part AR (excluding the opening described later) of the liquid crystal display device shown in FIG. 2, so that the gate signal line GL, the drain signal line DL, the thin film transistor It is formed to cover the TFT and the like.

In the equivalent circuit shown in FIG.
Is to be supplied with a reference voltage via the counter voltage signal line CL. In this manner, the counter electrode CT formed substantially over the entire area of the liquid crystal display part AR is connected to the counter voltage signal line CL.
Is included without any distinction between the boundaries, and the overall resistance can be reduced.

Of course, the counter voltage signal line CL may be separately provided in any layer below the counter electrode CT, and the counter electrode CT and the counter voltage signal line CL may be electrically connected by lamination or through holes. Good.

The counter electrode CT formed in almost the entire area of the liquid crystal display part AR can supply a reference voltage from outside the sealing material SL at several points, thereby reducing signal waveform distortion. Can be.

An interlayer insulating film LI made of, for example, an acrylic organic resin material is formed on the upper surface of the counter electrode CT. The interlayer insulating film LI serves as an insulating film for insulating the pixel electrode PX formed on the upper surface from the counter electrode CT.

A pixel electrode PX is formed on the upper surface of the interlayer insulating film LI. The pixel electrode PX overlaps with the counter electrode CT, and extends in the y direction in FIG. It is composed of a group (two in the figure for simplicity).

Each of the plurality of pixel electrodes PX has a pattern connected to each other at one end thereof.
At least one of the other ends is electrically connected to the source electrode SD2 of the thin film transistor TFT through the interlayer insulating film LI, the color filter FIL, and the contact hole CH formed in the protective film PSV positioned below.

In this case, the contact hole C
An opening is formed in the counter electrode CT in the portion where H is formed, so that electrical contact between the counter electrode CT and the pixel electrode PX is avoided.

Further, in a portion where the pixel electrode PX overlaps with the counter electrode CT, a capacitive element Cstg having an interlayer insulating film LI between them as a dielectric film is formed.
The tg has a function of, for example, accumulating a video signal supplied to the pixel electrode PX for a relatively long time. At this time, the pixel electrode PX can be formed of metal, but is preferably formed of a transparent conductor such as an ITO film or an IZO film in order to improve the transmittance.

An alignment film ORI1 is formed on the main surface of the transparent substrate SUB1 on which the pixel electrodes PX are formed as described above so as to cover the pixel electrodes PX. This alignment film O
RI1 is a film directly in contact with the liquid crystal LC, and determines the initial alignment direction of the molecules of the liquid crystal LC by rubbing formed on the surface thereof. A polarizing plate POL1 is attached to the surface of the transparent substrate SUB1 opposite to the liquid crystal.

An alignment film ORI2 is formed on a liquid crystal side surface of the transparent substrate SUB2 which is disposed to face the transparent substrate SUB1 via the liquid crystal LC, and the alignment film ORI2 is a film directly in contact with the liquid crystal LC. The rubbing formed on the surface determines the initial alignment direction of the molecules of the liquid crystal LC. The transparent substrate SUB2
A polarizing plate POL2 is attached to the surface opposite to the liquid crystal.

The alignment film ORI1 and the polarizing plate POL1 formed on the transparent substrate SUB1 and the alignment film ORI2 and the polarizing plate POL2 formed on the transparent substrate SUB2 are optical means for visualizing the behavior of the liquid crystal. In the case of the example, for example, it is set as shown in FIG.

The rubbing directions RDR of the respective alignment films ORI1 and ORI2 are parallel to each other (the same direction). For example, the direction ED of the electric field between the pixel electrode PX and the counter electrode CT is ED.
The angle with respect to R is 75 °.

In this case, the angle between the rubbing direction RDR and the applied electric field direction EDR may be 45 ° or more and less than 90 ° as long as the liquid crystal has a positive electric anisotropy Δε. If Δε is negative, it may be more than 0 ° and 45 ° or less.

By setting the rubbing directions RDR of the respective alignment films to be parallel to each other (to the same direction), the initial pretilt angle of liquid crystal molecules at the upper and lower interfaces (with the substrate) of the liquid crystal contributing to display between electrodes and on the electrodes. Are in a splay state, and the liquid crystal molecules compensate each other for optical characteristics, thereby obtaining a wide viewing angle characteristic.

The polarizing plates POL1 and POL2 have one polarized light transmission axis coincident with the rubbing direction and the other polarized light transmission axis perpendicular to the rubbing direction. Thereby, it is possible to obtain a normally closed characteristic in which the transmittance increases as the voltage applied to each electrode increases. Further, when no voltage is applied, a high quality black display can be obtained.

Between the counter electrode CT and the pixel electrode CT,
As shown in FIG. 4, an electric field E is generated, and the electric field of a component substantially parallel to the transparent substrate SUB1 causes the molecules LCM of the liquid crystal to rotate at an angle corresponding to the intensity of the electric field.

In this case, the counter electrode CT is formed over almost the entire area of the pixel region, and serves as a shield, so that the electric field below it does not affect the liquid crystal side at all. For this reason, the color filter FIL has an effect of not adversely affecting the distribution of the electric field generated between the pixel electrode PX and the counter electrode CT.

<< Manufacturing Method >> FIGS. 6 (a) to 6 (j)
FIG. 4 is a process chart showing one embodiment of a method for manufacturing a liquid crystal display device according to the present invention, and particularly shows a method for manufacturing a transparent substrate SUB1.

Step 1. (FIG. 6A) A transparent substrate SUB1 is prepared, and Cr and C are formed on the main surface thereof.
A gate signal line GL is formed by forming a laminated film of an r-Mo alloy and performing selective etching by a photolithography technique. Needless to say, a stacked structure of Al or an alloy containing Al, or Al or an alloy containing Al and another metal or alloy may be used.

Step 2. (FIG. 6B) Gate signal line GL
The insulating film GI made of a SiN film and the semiconductor layer made of Si are sequentially laminated on the main surface of the transparent substrate SUB1 on which the semiconductor layer is formed. After the formation of d0, the semiconductor layer is selectively etched by photolithography to form a semiconductor layer AS.

Step 3. (FIG. 6C) A laminated film of Cr and a Cr—Mo alloy is formed on the main surface of the transparent substrate SUB1 on which the semiconductor layer AS has been formed, and this is selectively etched by photolithography technology to form a drain signal line. DL, thin film transistor TF
A drain electrode SD1 and a source electrode SD2 of T are formed. Then, the drain electrode SD1 and the source electrode SD
2 as a mask, and the semiconductor layer AS
The upper high concentration layer d0 is removed by etching.

Step 4. (FIG. 6D) On the main surface of the transparent substrate SUB1 on which the drain signal line DL, the drain electrode SD1, and the source electrode SD2 are formed,
For example, a protective film PSV made of SiN is formed, and is selectively etched by photolithography to form a contact hole CH1 exposing a part of the source electrode SD2. In this case, a hole for exposing each terminal of the drain signal line DL and each terminal of the gate signal line is simultaneously formed.

Step 5. (FIG. 6E) A resin film containing a pigment is formed on the main surface of the transparent substrate SUB1 on which the protective film PSV is formed, and the color film FIL is formed by subjecting the resin film to selective etching by photolithography. I do. At the time of etching in this case, a contact hole CH2 exposing a part of the source electrode SD2 is also formed at the same time. The color filter FIL is composed of each color of red, green, and blue, and is selectively etched by photolithography for each of those colors.

Step 6. (FIG. 6F) On the main surface of the transparent substrate SUB1 on which the color filter FIL is formed, for example, ITO (Indium Tin Oxide), IZO
(Indium Zinc Oxide) or the like, a contact hole CH3 exposing a part of the source electrode SD2 is formed, and selective etching is performed by photolithography to form a counter electrode CT. To form In this case, the counter electrode CT is formed also over the adjacent pixel region, and is formed in common with the counter electrode CT of the adjacent pixel region.

Step 7. (FIG. 6G) On the main surface of the transparent substrate SUB1 on which the counter electrode CT is formed, an interlayer insulating film L made of, for example, an acrylic organic resin is formed.
I is formed, and selective etching by photolithography is performed so as to form a contact hole CH4 exposing a part of the source electrode SD2.

Step 8. (FIG. 6H) A light-transmitting conductive film made of, for example, ITO (Indium Tin Oxide) is formed on the main surface of the transparent substrate SUB1 on which the interlayer insulating film LI is formed, and this is selected by a photolithography technique. The pixel electrode PX is formed by etching. The pixel electrode PX includes, for example, a plurality of electrode groups extending in the y direction and arranged in parallel in the x direction, and is formed in a so-called comb-like pattern. In this case, a part of the pixel electrode PX is part of the source electrode SD.
2 are formed on the contact holes exposing them, thereby electrically connecting to the source electrode SD2.

Step 9. (FIG. 6 (i)) A resin film is formed on the main surface of the transparent substrate SUB1 on which the pixel electrodes PX are formed, and the surface is rubbed to form an alignment film ORI1.

Step 10. (FIG. 6 (j)) A polarizing plate POL is provided on the surface of the transparent substrate SUB1 opposite to the liquid crystal.
1. A light-transmitting conductive film TI1 is formed.

Embodiment 2 FIG. 7 and 8 are configuration diagrams showing another embodiment of the liquid crystal display device according to the present invention, and correspond to FIGS. 3 and 4, respectively. 3 and 4 is different from the interlayer insulating film L on which the pixel electrode PX is formed.
I, the interlayer insulating film LI has a large thickness in a region where the pixel electrode PX is formed, and has a small thickness in a region where the pixel electrode PX is not formed. . Such a configuration is formed, for example, by etching the surface of the interlayer insulating film LI using the patterned pixel electrode PX as a mask. In the liquid crystal display device configured as described above, the voltage between the pixel electrode PX and the counter electrode CT required for driving the liquid crystal can be reduced. In a region where the pixel electrode PX is not formed, the interlayer insulating film LI is formed.
Of the pixel electrode PX and the counter electrode CT
This is because the intensity of the electric field generated during the period decreases.
Therefore, in this embodiment, a liquid crystal display device with low power consumption can be obtained.

Embodiment 3 FIG. 9 and 10 are configuration diagrams showing another embodiment of the liquid crystal display device according to the present invention, and correspond to FIGS. 3 and 4, respectively. 3 and 4 is in the color filter FIL, and the interlayer insulating film LI is formed on the side wall surface of the contact hole CH formed therein.
Is not covered by

That is, the connection between the pixel electrode PX formed in the contact hole CH and the source electrode SD2 of the thin film transistor TFT is in direct contact with the color filter FIL. Color filter FI
Since L is composed of a resin film containing a pigment, it is substantially an insulating film itself, and does not cause a short circuit between the pixel electrode PX and the counter electrode CT.

FIG. 11 is a process diagram showing an embodiment of a method of manufacturing a liquid crystal display device having such a configuration, and corresponds to FIG. The portion different from FIG. 6 is the portion shown in FIG. 6 (g). When the contact hole CH4 in the interlayer insulating film LI is formed, the diameter thereof is substantially equal to or larger than that of the contact hole formed in the color filter FIL. Is to do.

In each of the embodiments described above, the electrode formed in the lower layer of the interlayer insulating film LI is used as the counter electrode, and the electrode formed in the upper layer is used as the pixel electrode. However, in the above-described configuration, it goes without saying that an electrode formed in the lower layer of the interlayer insulating film LI may be used as a pixel electrode and an electrode formed in an upper layer may be used as a counter electrode.

In this case, since the pixel electrode must be electrically separated from the pixel electrodes in the other adjacent pixel regions, for example, the slits are formed on the drain signal line DL and the gate signal line GL, respectively. It is configured to be physically separated.

Even in such a configuration, since the pixel electrode is formed over the color filter FIL in substantially the entire area above the color filter FIL in each pixel region, the color filter FIL is generated between the pixel electrode and the counter electrode. It does not adversely affect the applied electric field.

[0075]

As is apparent from the above description, according to the liquid crystal display device of the present invention, the disturbance of the electric field due to the color filter can be avoided.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a pixel of a liquid crystal display device according to the present invention.

FIG. 2 is an equivalent circuit diagram showing one embodiment of a liquid crystal display device according to the present invention.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is an explanatory diagram showing a relationship between a direction of an electric field of the liquid crystal display device according to the present invention and an alignment film and a polarizing plate.

FIG. 6 is a process chart showing one embodiment of a method for manufacturing a liquid crystal display device according to the present invention.

FIG. 7 is a sectional view showing another embodiment of the liquid crystal display device according to the present invention, corresponding to FIG.

8 is a cross-sectional view showing another embodiment of the liquid crystal display device according to the present invention, and is a view corresponding to FIG.

FIG. 9 is a sectional view showing another embodiment of the liquid crystal display device according to the present invention, corresponding to FIG.

FIG. 10 is a sectional view showing another embodiment of the liquid crystal display device according to the present invention, and is a view corresponding to FIG.

FIG. 11 is a process chart showing another embodiment of the method of manufacturing the liquid crystal display device according to the present invention.

[Explanation of symbols]

SUB: transparent substrate, GL: gate signal line, DL: drain signal line, TFT: thin film transistor, AS: semiconductor layer, SD1: drain electrode, SD2: source electrode, PX
... pixel electrode, CT ... counter electrode.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09F 9/30 349 G09F 9/30 349B 9/35 9/35 (72) Inventor Ryutaro Oke Mobara-shi, Chiba 3300 Hayano F-term in Hitachi Display Group (reference) 2H091 FA02Y FD06 GA02 GA03 GA06 GA13 LA17 LA19 2H092 GA24 JA24 JB05 JB16 NA01 NA07 NA19 PA02 PA08 5C094 AA08 AA53 BA03 BA43 CA19 DA15 EA04 EA07 ED03

Claims (8)

[Claims] A liquid crystal side surface of one of the substrates opposed to each other with a liquid crystal interposed therebetween, wherein a laminated body of a pixel electrode, an insulating film, and a counter electrode is formed from the liquid crystal side; The electrode is formed of a light-transmitting conductive layer that covers substantially the entire region of the pixel region, and the pixel electrode overlaps with the counter electrode, extends in one direction, and is juxtaposed in a direction intersecting the direction. A liquid crystal display device comprising: a plurality of electrode groups; and a color filter formed on the one substrate side with respect to the laminate. 2. A laminated body of a pixel electrode, an insulating film, and a counter electrode is formed from a liquid crystal side in a pixel region on a liquid crystal side surface of one of the substrates opposed to each other with a liquid crystal interposed therebetween. The electrode is formed of a light-transmitting conductive layer that covers substantially the entire pixel region over another adjacent pixel region, and the pixel electrode overlaps with the counter electrode and extends in one direction. A liquid crystal display device, comprising: a plurality of electrode groups arranged in parallel in a direction intersecting a direction, wherein a color filter is formed on the one substrate side with respect to the laminate. 3. A laminate of a pixel electrode, an insulating film, and a counter electrode is formed in a pixel region on a liquid crystal side surface of one of the substrates opposed to each other with a liquid crystal interposed therebetween. The electrode is formed of a light-transmitting conductive layer that covers substantially the entire pixel region over another adjacent pixel region, and the pixel electrode overlaps with the counter electrode and extends in one direction. A plurality of electrode groups arranged side by side in a direction intersecting a direction, a color filter is formed on the one substrate side with respect to the laminate, and the insulating film is a region where a pixel electrode is formed. The liquid crystal display device is characterized in that the film thickness is formed large and the film thickness in a region where the pixel electrode is not formed is small. 4. A laminated body of a counter electrode, an insulating film, and a pixel electrode is formed from a liquid crystal side in a pixel region on a liquid crystal side surface of one of the substrates opposed to each other with a liquid crystal interposed therebetween. The electrode is formed of a light-transmitting conductive layer that covers substantially the entire pixel region, and the counter electrode is overlapped with the pixel electrode, extends in one direction, and is juxtaposed in a direction intersecting the direction. A liquid crystal display device comprising: a plurality of electrode groups; and a color filter formed on the one substrate side with respect to the laminate. 5. A pixel region surrounded by a pair of gate signal lines and a pair of drain signal lines on a liquid crystal side surface of one of the substrates opposed to each other with a liquid crystal interposed therebetween. A thin film transistor in which at least a part of one of the pair of gate signal lines is used as a gate electrode and a drain electrode is connected to one of the pair of drain signal lines and the drain electrode is connected to the thin film transistor; A pixel electrode connected to a source electrode of the thin film transistor via a protective film, a color filter, a counter electrode, an interlayer insulating film, and a through hole to be formed is laminated, and the counter electrode covers substantially the entire pixel region. And a plurality of the pixel electrodes, which overlap with the counter electrode and extend in one direction and are arranged in a direction intersecting with the pixel electrode. The liquid crystal display device, characterized in that is composed of the electrode group. 6. A pixel region surrounded by a pair of gate signal lines and a pair of drain signal lines on a liquid crystal side surface of one of the substrates opposed to each other with a liquid crystal interposed therebetween. A thin film transistor in which at least a part of one of the pair of gate signal lines is used as a gate electrode and a drain electrode is connected to one of the pair of drain signal lines and the drain electrode is connected to the thin film transistor; A pixel electrode connected to the source electrode of the thin film transistor via a protective film, a color filter, a counter electrode, an interlayer insulating film, and a through hole to be formed is laminated, and the counter electrode extends to another adjacent pixel region. The pixel electrode is formed of a light-transmitting conductive layer that covers substantially the entire region, and the pixel electrode overlaps with the counter electrode and extends in one direction. The liquid crystal display apparatus characterized by being composed of a plurality of electrode groups are arranged in parallel in the direction in which the difference. 7. A pixel region surrounded by a pair of gate signal lines and a pair of drain signal lines on a liquid crystal side surface of one of the substrates opposed to each other with a liquid crystal interposed therebetween. A thin film transistor in which at least a part of one of the pair of gate signal lines is used as a gate electrode and a drain electrode is connected to one of the pair of drain signal lines and the drain electrode is connected to the thin film transistor; A pixel electrode connected to the source electrode of the thin film transistor via a protective film, a color filter, a counter electrode, an interlayer insulating film, and a through hole to be formed is laminated, and the counter electrode extends to another adjacent pixel region. The pixel electrode is formed of a light-transmitting conductive layer covering substantially the entire region, and the pixel electrode overlaps with the counter electrode and extends in one direction to extend in the direction. The interlayer insulating film has a large thickness in a region where the pixel electrode is formed and a small thickness in a region where the pixel electrode is not formed. A liquid crystal display device comprising: 8. A pixel region surrounded by a pair of gate signal lines and a pair of drain signal lines on a liquid crystal side surface of one of the substrates opposed to each other with a liquid crystal interposed therebetween. A thin film transistor in which at least a part of one of the pair of gate signal lines is used as a gate electrode and a drain electrode is connected to one of the pair of drain signal lines and the drain electrode is connected to the thin film transistor; A pixel electrode, an interlayer insulating film, and a counter electrode connected to the source electrode of the thin film transistor via a formed protective film, a color filter, and a through hole are laminated, and the pixel electrode covers substantially the entire pixel region. And a plurality of the counter electrodes overlap with the pixel electrodes, extend in one direction, and are arranged in a direction intersecting the direction. The liquid crystal display device, characterized in that is composed of the electrode group.