JP2003015146A - Liquid crystal display device - Google Patents

Liquid crystal display device

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Publication number
JP2003015146A
JP2003015146A JP2001203418A JP2001203418A JP2003015146A JP 2003015146 A JP2003015146 A JP 2003015146A JP 2001203418 A JP2001203418 A JP 2001203418A JP 2001203418 A JP2001203418 A JP 2001203418A JP 2003015146 A JP2003015146 A JP 2003015146A
Authority
JP
Japan
Prior art keywords
liquid crystal
crystal display
display device
electrode
pixel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2001203418A
Other languages
Japanese (ja)
Inventor
Katsumi Kondo
Kenji Okishiro
賢次 沖代
克己 近藤
Original Assignee
Hitachi Ltd
株式会社日立製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd, 株式会社日立製作所 filed Critical Hitachi Ltd
Priority to JP2001203418A priority Critical patent/JP2003015146A/en
Publication of JP2003015146A publication Critical patent/JP2003015146A/en
Application status is Pending legal-status Critical

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Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device wherein the strongest requirement items such as high definition, high quality, and a high opening ratio are achieved at the same time by employing a transparent conductive film as an electrode material in a fishbone IPS. SOLUTION: The liquid crystal display device, wherein both pixel electrodes and a common electrode are formed of a transparent conductive film in a chevron, the chevron form pixel electrodes and the chevron form common electrode are alternately arranged so as to divide the pixels in the longitudinal direction of the pixels in the pixels surrounded by scanning wiring and signal wiring; and also the pixel electrode in the same pixel are connected with both ends of the pixel, respectively, and the common electrodes are connected with both ends of the pixel, respectively.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an active matrix.
The present invention relates to a liquid crystal display device of the type. 2. Description of the Related Art Liquid crystals and display elements are made of, for example, glass.
Place two transparent insulating substrates such as at predetermined intervals
The liquid crystal is injected into the gap. Glass
A polymer thin film called an alignment film is placed between the substrate and the liquid crystal layer.
Orientation and alignment treatment to align the liquid crystal molecules.
ing. [0003] Further, the liquid crystal display element is driven by its driving method.
Simple matrix type and active matrix type
Are classified into one. Of these two, especially in terms of display quality
In the active matrix type is attracting attention,
In liquid crystal display devices, thin film transistors
(TFT: Thin Film Transistor)
Driving using is the mainstream. In a TFT drive type liquid crystal display device, a liquid crystal display
On one of the glass substrates constituting the element,
Scanning wiring groups which are arranged in parallel in the Y direction and
Extending in the Y direction while being insulated from the wiring group
Signal wiring groups are formed, and these scanning wiring groups
Each area surrounded by and the signal wiring group is a pixel area
In this pixel area, a TFT is formed as an active element.
ing. When a scanning signal is supplied to the scanning wiring, the TFT is turned off.
Video signal from the signal wiring via the TFT
Is supplied to the pixel electrode. This allows each pixel to be directly
Driven. Note that each scanning wiring and signal wiring are
Extending to the periphery of the plate to form external terminals,
IC for driving the IC is externally mounted around the substrate
It has become. [0005] As a mounting method of the driving IC, TCP is mainly used.
There is mounting and FCA mounting (or COG mounting). TCP
In mounting, the drive IC is a thin polyimide flexible
Tape automated bonding method (TA
B) Tape carrier package (T
CP) by using an anisotropic conductive film (ACF)
Connected to With such a mounting method,
Wiring accuracy is poor due to poor dimensional stability of
It is very unsuitable for fine pitch formation. Further, liquid crystal display data required for the driving IC
And a timing signal for liquid crystal are transmitted to each drive IC.
Wiring peripheral circuits to the printed circuit board
Package (TCP) and the tape carrier package.
Liquid crystal display by connecting to a package (TCP)
Make up the device. Therefore, the display area of the liquid crystal display
The area occupied by the outside area (so-called picture frame) has increased
U. It should be noted that in the technology currently in practical use, TCP mounting
Is limited to about 130 ppi. On the other hand, in FCA mounting, TCP components are used.
Directly mounting the drive IC on the substrate of the liquid crystal display element without using
It is a law that can respond to fine pitches,
The feature is that it can be made into a picture frame. Currently, drive ICs are displayed on a liquid crystal display using FCA mounting
When connecting directly to the device substrate, the liquid crystal display
ACF (anisotropic)
Conductive film), and then the electrode pattern of the liquid crystal display element.
And the electrode pattern of the drive IC are aligned. So
And press it from the drive IC side with a crimping tool.
Full pressure bonding under conditions of temperature and high pressure. Usually, the temperature during final compression
It is about 170 ° C. Here, the surface of the spherical polymer is made of gold and the ACF is made of gold.
Covered with an insulating film
Have been. This spherical polymer is crushed by crimping
The electrodes of the drive IC and the electrodes of the liquid crystal display element are connected via gold.
Conduct. On the other hand, the outermost surface of this spherical polymer is
Between the polymers.
And not. Such a liquid crystal display device is lightweight, thin and low.
Clocks, calculators, mobile phones, taking advantage of features such as power consumption
Used in many products such as notebook computers
You. In addition, instead of CRT, desktop PC monitor
Its use in digital cameras and even televisions is expanding. Like this
Demand for liquid crystal display devices in the future
However, three items are particularly important for future LCD devices
It is. That is, high definition (high resolution), high image quality (wide field of view)
Angle, color reproducibility, high contrast ratio) and high aperture ratio.
The necessity of these three items will be described below. (1) High definition (high resolution) Most of the liquid crystal display devices currently supplied to the market are 1
80-100 pixels per inch, ie 80-100p
pi is the definition. Where ppi is the unit of definition
Indicates the number of pixels per inch. Partially notebook type
In a liquid crystal display device for a Socon, a 15-inch UXGA (1
(600 x 1200 pixels) up to 130 ppi,
19-20 inch UXGA (100p
pi) are being developed one after another. However, art viewing displays,
In addition, radiographs can be displayed and endoscopy can be performed during surgery.
The medical industry wants to display images on a monitor,
Especially considering the display of the picture quality equivalent to that required in the printing industry
Then, higher definition is needed. However, image quality
Is determined by the distance between the screen and the human viewpoint.
The required definition depends on the size of the screen. For example, when a person looks at a screen,
If the definition that cannot recognize one pixel is the image quality, 1
A 5 inch monitor needs more than 140ppi
(Flat Panel Display 2000, Nikkei
BP). In recent years, it has been higher than IBM at 200 ppi.
A high-definition liquid crystal display (20.8 inch) has been prototyped
You. 200 ppi human eyes look at objects at a distance of 45 cm
The highest resolution in the case of (2) High image quality (wide viewing angle, color reproducibility,
The image quality is the same as for definition, for medical and art appreciation,
Need high image quality considering Internet product browsing
It is. High image quality here means high contrast ratio, color
Reproducibility, wide viewing angle, etc. Currently, Hitachi, Ltd.
In contrast, S-IPS mass-produced in
50: 1, viewing angle 170 degrees (contrast ratio 1
0: 1 or more) and high color purity of 60% or more in NTSC ratio
And is said to have the highest image quality of still images.
However, at least the same image quality is required. (3) High aperture ratio As the definition of pixels increases in the future, the pixel pitch will become narrower.
You. For example, at 140 ppi, the pixel pitch is approximately 20
0 μm. Necessary wiring in such a small area
When electrodes and electrodes are placed, the area through which light can
And the aperture ratio decreases. The decrease in aperture ratio is directly
This is a major problem related to a reduction in luminance. The decrease in luminance due to the decrease in the aperture ratio is compensated for.
Power consumption cannot be large to compensate by light
Not get. A decrease in aperture ratio has a large effect on power consumption
Is a factor. After all, considering the brightness and power consumption,
It is necessary to make a percentage. Considering the future liquid crystal display,
The three items are very important. So, these
Focusing on the items, the conventional liquid crystal display device was summarized.
Table 1 shows the achievement of each item in each conventional technology.
Was. ○ High achievement level, low achievement level or
× that cannot be achieved and those that can be achieved conditionally
Indicated as Δ. The details of each technology are described below.
However, from this table, at present, all three items are satisfied at the same time.
It turns out that there is no technology to add. [Table 1] Representative of the above-mentioned TFT driven liquid crystal display device
There is a TN type liquid crystal display device. TN liquid crystal display
In the arrangement, the pixels are almost inside the two substrates sandwiching the liquid crystal layer.
Electrodes are arranged so as to cover one surface, and these electrodes
By applying an electric field in the direction perpendicular to the plate,
Drives the liquid crystal molecules that are aligned 90 degrees twisted in the plate and emits light.
Switch. In addition, the polarizing plate is used for the liquid crystal display element.
Cross Nicols are placed on the outer surface of the upper and lower substrates and normally
-It is arranged to be open. That is, no voltage
When the voltage is applied, the display becomes white, and when the voltage is applied, the display becomes black. Such a TN type liquid crystal display device is mainly
It is used in notebook PCs and has a liquid crystal display
With light sources such as backlights and other optical elements
Reduced external dimensions of integrated LCD module
In response to the demands, the drive IC was used without using TCP parts.
FCA method directly mounted on one substrate of liquid crystal display element
(Or COG method). FCA method
If it is adopted, as described above,
Compatible with high definition liquid crystal display devices
Noh. In addition, a pixel electrode and a pixel electrode covering almost one surface of the pixel region are provided.
And its counter electrode is formed of a transparent conductive film such as ITO.
Therefore, a high aperture ratio can be achieved. However, in a TN mode liquid crystal display device,
Is caused by an electric field in the direction perpendicular to the substrate (vertical electric field).
Display the image by placing the child vertically on the board
Image quality varies depending on the viewing angle of the screen.
That is, there is a problem that the viewing angle is narrow. Also, apply voltage
The black level to display black.
Bad, contrast ratio is as high as 200
No. Solves problems of viewing angle and color reproducibility of TN system
In order to achieve this, the generated electric field is
The liquid crystal molecules have a component substantially parallel to
Rotate in a plane almost parallel to the plane to use the birefringence of the liquid crystal
The IPS system for displaying images is described in JP-B-63-21907.
No. 4,345,249, etc.
ing. In this method, liquid crystal molecules are rotated in a plane.
The angle at which the screen is viewed because the light is switched by
No inversion of gradation and color tone
The viewing angle is wider than the TN method. Also, when the voltage is off
For black display, so-called normally closed
In addition, the black level is better than the TN method,
The strike ratio can be realized. Instead of such an IPS type liquid crystal display device,
FIG. 19 shows a tabular configuration. First, on the glass substrate 8
The through electrodes 3 and the scanning lines 4 are formed. Next, the SiN etc.
An edge film 7 is formed, and the signal wiring 1 and the pixel electrode are formed on the insulating film.
2 are formed. Note that the pixel electrode is an active element TFT5.
Connected to the signal wiring. Furthermore, such as SiN
An insulating film 6 is formed to form an electrode substrate. On the other hand, light is shielded on the opposite glass substrate 9.
Black matrix 24, RGB color fill for
23, overcoat film 2 for flattening them
2 are formed to form a color filter substrate. These electrode bases
To align liquid crystal on the board and color filter substrate
Is formed. Generally, polyimide is used for the alignment film.
These are used, for example, by rubbing (rubbing with a cloth).
Then, the liquid crystal molecules are aligned in a predetermined direction. These two substrates are assembled, and a liquid crystal is
20 and the polarizing plate 25 is crossed with a cross Nicol.
-The condition of the fully closed condition (black display with no voltage applied)
A liquid crystal display element is formed by sticking together. What
The voltage is applied between the pixel electrode 2 and the common electrode 3,
The resulting electric field 26 almost parallel to the substrate causes the liquid crystal molecules
Is driven in the plane to switch light. IPS system excellent in such viewing angle characteristics
Is a new liquid crystal display device that replaces the conventional TN method
High-definition and large-screen LCD panels and LCDs expected in the future
This is an important technology for television. Hereinafter, IPS liquid
The details of the conventional technology of the crystal display device will be described. S-IPS In the conventional IPS system, when the screen is viewed from an oblique direction,
The direction in which the color changes to blue depending on the viewing angle and the yellow
There was a direction to change. So we improved these and further
A technique for widening the viewing angle is disclosed in Japanese Patent Application Laid-Open No. H11-30784.
Published in the official gazette. In fact, the V-shaped electrode structure proposed here is
The IPS-type liquid crystal display device with the structure "S-IPS"
It has been commercialized (Hitachi, Ltd.). In the S-IPS, the short axis direction of the pixel (usually,
Comb teeth arranged to divide the pixel in the scanning wiring direction)
The electrodes are formed in a U-shape to form one image.
Rotation direction of liquid crystal molecules when voltage is applied to the element
Color change is suppressed to form domains. this
In S-IPS, the contrast ratio is 350: 1,
Field angle 170 degrees (upper and lower contrast ratio 10: 1 or less
Above) and achieves high color purity of 60% or more compared to NTSC
It is said to have the highest image quality of still images. However, in S-IPS, high definition
It is difficult to achieve both a high aperture ratio and a high aperture ratio. Here's why
I will tell. When considering the high definition of S-IPS,
The pixel pitch becomes smaller. In that small pixel
Necessary electrodes and wiring are arranged with a small space between them.
There must be. However, in S-IPS, these electrodes
And the wiring is made of metal material such as chrome
The light does not pass through the electrode part and the aperture increases as the definition increases
The rate drops significantly. In other words, pixel resolution is
If the switch is small, a high aperture ratio cannot be achieved. When the definition is increased, the aperture ratio is given priority.
For example, to reduce the number of electrodes in a pixel,
The three pixel electrodes were changed to one (for example,
IPS), the drive power of the liquid crystal display
The electrode spacing that greatly affects the pressure is determined by the definition,
It greatly affects production efficiency. Details will be described later. On the other hand, the pixel pitch is reduced (comb-tooth electrode
To reduce the aperture ratio due to narrowing the gap)
In addition, in the S-IPS, an electrode material such as ITO is used.
The use of such a transparent conductive film is disclosed in JP-A-9-61842.
No. 1993. There are other similar proposals,
These are all in the short axis direction of the pixel (usually the scanning wiring direction).
For application to comb-shaped electrodes arranged to divide pixels
Limited. These suggestions are certainly
Suppress decrease in aperture ratio due to pixel pitch reduction due to thinning
It is possible. However, according to the study of the present inventors,
It has been found that side effects occur simultaneously with high definition. [0034] IT which is usually used as a transparent conductive material
O and the like have extremely poor processing accuracy compared to metal electrodes. High spirit
When electrode spacing becomes very narrow due to thinning, this processing accuracy
Will be greatly reflected in the variation of the electrode spacing.
That is, the narrower the electrode spacing, the lower the processing accuracy
In the case of a bright conductive film, the variation in the electrode spacing becomes large.
Is a cause of uneven brightness. From these things
As can be seen, in the current S-IPS, high definition
And high aperture ratio are in a trade-off relationship.
Sometimes it is difficult to achieve. In addition, the definition of the driving IC has been improved from the mounting method.
Considering this, the following can be pointed out. As mentioned above,
In the case of a high-definition liquid crystal display device, the mounting of the drive IC is TCP
FCA implementation is more suitable than implementation. However,
When FCA implementation is applied to existing S-IPS,
It has been found that luminance unevenness occurs around the child. this
Is that the drive voltage of the current S-IPS is almost 2 times lower than that of TN.
About twice as high, so a high-output drive IC is required.
is there. In a high-output driving IC, the driving IC
The heat generated is large, and this heat is transferred to the directly connected glass substrate.
Alternatively, for example, the liquid crystal has a Tni point (liquid crystal phase / isotropic phase transition).
(Temperature). Therefore,
Currently, when the drive IC of the heating part is isolated from the liquid crystal display element,
The TCP implementation is adopted based on the above idea. Current S-
In IPS, there is also a problem in the mounting method, and it is difficult to achieve high definition.
In the situation. Fishbone IPS (FB-IP)
S) An electrode structure different from S-IPS reduces color change,
Means for improving image quality is disclosed in JP-A-11-202323.
And IDRC'97L9-L12. Liquid crystal display having the electrode structure shown here
The device is Fishbone IPS (FB-IPS)
You. In fishbone IPS, the pixel electrode and its opposite
One common electrode is shaped like a square, and each square shaped electrode is
Divide in the long axis direction (usually the direction in which the signal wiring extends)
The structure is arranged in a fishbone shape. In such a structure, S-IPS and
Similarly, when a voltage is applied, liquid crystal molecules
Has two domains with different rotation directions of
Extremely good viewing angle characteristics, such as coloring from a corner or oblique view
Good and high image quality can be achieved. There is also an advantage that S-IPS does not have. It
Is different from S-IPS in fishbone IPS.
This is because pixels are divided along the long axis direction of the element.
As a result, the tolerance for selecting the electrode interval is greater than that of S-IPS.
spread. For example, the same liquid crystal material regardless of the definition
And adjust the electrode spacing to any drive voltage.
In order to make the setting, this margin is greatly effective. The liquid crystal material is used for display characteristics of a liquid crystal display device (eg,
(E.g., drive voltage, retention rate, etc.)
Considering the production efficiency, the same regardless of the definition of the LCD
Want to use a liquid crystal material. In such a case,
Fishbone IPS, which has a design margin, is suitable
You. In addition, fishbone IPS uses raw
It is very insensitive to the variation in the electrode spacing. Immediately
That is, it is difficult to see uneven brightness due to variations in electrode spacing. This
This is for the following reasons. In fishbone IPS, one pixel
It has a structure having various electrode intervals inside. This
In such a structure, when the above-mentioned electrode spacing is narrowed,
Luminance unevenness due to variations in the electrode spacing is difficult to see. Construction
It is difficult to have multiple electrode intervals in one pixel.
To have various brightness in one pixel for different voltage
Means For this reason, the electrode spacing generated in the manufacturing process
The brightness change due to the variation in
This is because it is included in the degree change. However, the above known example (Japanese Patent Laid-Open No. 11-202)
No. 323 and IDRC '97L9-L12)
In the Fishbone IPS, there is no description of the electrode material.
There is no description about aperture ratio, brightness unevenness, etc.
If the pixel electrode and the common electrode are metal materials, S-IP
Similarly to S, the narrowing of the electrodes with higher definition
The problem is that the rate drops significantly. That is,
As with the S-TFT, the high-definition shawn IPS
Thinning and high aperture ratio are in a trade-off relationship,
It cannot be done. Two-Division IPS In the conventional IPS structure, one pixel is formed by a metal comb.
By dividing into two by the tooth electrode, 200 ppi is obtained.
Liquid crystal display device (20.8 inches) with high definition
Was prototyped (IBM). However, such a split
In IPS, pixels are always divided into two at any definition.
High resolution only at a certain definition
Quality and high aperture ratio can be achieved. Greatly affects drive voltage
The electrode spacing greatly depends on the definition. That is, two-part IP
In S, the lower the definition, the wider the electrode spacing.
The dynamic voltage increases. To solve this, the dielectric of the liquid crystal material must be
Means to increase the rate anisotropy can be considered, but this is also limited
And by increasing the dielectric anisotropy,
Action (for example, easy to bring in impurity ions)
You. In addition, depending on the definition, the liquid crystal material corresponding to each
Preparing will greatly reduce production efficiency.
It goes. In the above prior art,
Higher definition and higher image quality required for future liquid crystal display devices,
Achieving all three items of high aperture ratio at the same time
Nothing (Table 1). Therefore, the purpose of the present invention is
Liquid crystal display device that can achieve all three items simultaneously
Is to provide. In addition, the remaining
Achieving even higher image quality by reducing image phenomena,
Improving production efficiency is also an important issue. The present invention solves the above problems.
The three items of high definition, high image quality, and high aperture ratio were decided.
To provide a liquid crystal display device that can be achieved all and at the same time
You. [1] A pair of groups at least one of which is transparent
Having a plate and a liquid crystal layer sandwiched between the pair of substrates.
A plurality of scanning lines are provided on one side of the substrate, and a matrix is
A plurality of signal wirings formed in a matrix, and the plurality of signal wirings
Corresponding to the respective intersections of
And a plurality of active devices connected to the active devices.
Between a plurality of pixel electrodes and each of the plurality of scanning lines.
Connected to the formed common wiring and the plurality of common wirings
A plurality of common electrodes, wherein the pixel electrode and the common electrode
A voltage is applied between the pair of substrates, and
By controlling the alignment of the liquid crystal with a strong electric field,
In the liquid crystal display device, the pixel electrode and the
The common electrodes are both formed in a square shape by the transparent conductive film.
Of a pixel surrounded by the scanning wiring and the signal wiring.
Inside the pixel so as to divide the pixel in the longitudinal direction of the pixel.
The V-shaped pixel electrodes and the U-shaped common electrodes are alternately arranged.
Pixel electrodes within the same pixel
And the common electrode is connected to each other at both ends of the pixel
The liquid crystal display device is characterized in that: [2] A pair of groups at least one of which is transparent
Having a plate and a liquid crystal layer sandwiched between the pair of substrates.
A plurality of scanning wirings and the scanning
A plurality of signal wirings formed in a matrix in the wiring,
Each of the plurality of signal wirings and the plurality of scanning wirings.
A plurality of active elements formed corresponding to the intersections and their functions
A plurality of pixel electrodes connected to a moving element;
A common wiring formed between each of the wirings;
And a plurality of common electrodes connected to the common wiring
Applying a voltage between the pixel electrode and the common electrode,
Of the liquid crystal by a parallel electric field which is predominantly generated on the other substrate.
In a liquid crystal display device for performing display by controlling the orientation,
The elementary electrode and the common electrode are both Y-shaped with a transparent conductive film.
Formed and surrounded by the scanning wiring and the signal wiring.
Pixel in the longitudinal direction of the pixel
The Y-shaped pixel electrodes and the Y-shaped common electrodes are alternately arranged.
And the pixel electrodes in the same pixel are at both ends of the pixel.
And the common electrode is connected to each other at both ends of the pixel
The liquid crystal display device is characterized in that: [3] The Y-shaped pixel electrode and the Y-shaped pixel electrode
-Shaped common electrodes are formed in different layers with an insulating film
The Y-shaped pixel electrode and the Y-shaped common electrode center line are
The substrate on which the electrode group is formed between adjacent electrodes
[2] having no area overlapping in a direction perpendicular to
Liquid crystal display device. [4] The signal wiring, the scanning wiring, and the front
The common wiring, the common electrode and the pixel electrode are formed of a liquid crystal layer.
And a glass substrate, wherein the common electrode
Has at least one layer with the other electrode groups and wiring groups.
Are formed in different layers via an insulating film of
The electrode is the most liquid among the other electrode groups and the wiring group.
The liquid according to [1] or [2], which is formed on the crystal layer side
Crystal display device. A part of the common electrode is at least one layer or more.
Formed over the signal wiring via the insulating film of
You may. Further, at least the common electrode and the signal
In the region where the wiring is superimposed, the common electrode and the signal
Low-capacity insulation between wiring and to reduce capacitive load
A membrane may be interposed. [5] The electrode group and the wiring group are shaped
On the substrate opposite to the substrate on which the
The light-shielding black matrix that extends in the direction
And a light shielding black in the signal wiring extending direction.
In the above-mentioned liquid crystal display device where no matrix is formed,
is there. [6] At least a part of the common electrode is
Overlaid on scanning wiring via one or more insulating films
In the liquid crystal display device according to [4]. [7] At least the common electrode and the scan
In the area where the scanning wiring overlaps, the common electrode and the scanning
Low-capacity insulation to reduce the capacitive load between
The liquid crystal display device according to [4], wherein an edge film is interposed.
You. Further, at least a part of the common electrode is at least one.
The scanning wiring and the signal wiring via at least one insulating film.
It may be formed so as to be superimposed on both of the wires at the same time. [8] At least the common electrode and the signal
Area where signal lines overlap, the common electrode and the scanning
In the area where the lines overlap, the common electrode and the signal
Line, and between the common electrode and the scanning line.
A low-capacity insulating film to reduce the capacitive load
The liquid crystal display device according to the above [7]. [9] The electrode group and the wiring group are shaped
Black light-shielding on the substrate facing the substrate
The liquid crystal display according to [8], wherein no matrix is formed.
In the device. [10] The layer on which the common electrode is formed
Wherein the pixel electrode is formed in the most distant layer
In a liquid crystal display. [11] The common electrode and the pixel in the pixel
The arrangement of the elementary electrodes is such that the intersection of the diagonal lines of the pixels is
To the liquid crystal display device, which is arranged in an inverted state.
is there. [12] The common electrode and the common wiring are
Formed in different layers, with at least one
The contact formed on the insulating film with the insulating film above interposed
The common electrode and the common wiring are connected through a hole.
In the above-mentioned liquid crystal display device. [13] Before the electrode group is formed
On the substrate side, just below the alignment control film for aligning the liquid crystal
Then, a step formed in the step of forming the electrode group is flattened.
Liquid crystal display in which a planarizing insulating film for disposing is provided.
In the device. [14] In the scanning wiring and the signal wiring,
In one enclosed pixel, at least one or more of the active
An element is formed, and the active element is made of polycrystalline silicon.
The above-mentioned liquid crystal display device is formed. [15] The scanning lines and the signal lines
And a driving IC for supplying a signal to the common wiring,
On the substrate that constitutes the liquid crystal display device by FCA mounting
The liquid crystal display device is directly mounted on the liquid crystal display device. Before configuring the driving IC and the liquid crystal display device
Stress buffer between the substrate and the substrate to reduce stress strain
Are disposed in contact with the drive IC and the substrate.
You may. Further, the thermal expansion of the material forming the drive IC
Tension coefficient and thermal expansion coefficient of the substrate are almost the same
preferable. Further, the drive IC uses an ultraviolet curable resin.
And is directly mounted on the substrate without heat compression
Is preferred. Further, the driving IC and the substrate
In the meantime, the heat generated by the driving IC is conducted to the substrate.
Insulation or heat absorbing material to prevent contact with the drive IC
May be provided. [16] The transparent conductive film is made of indium oxide
Mustin (ITO), Indium Germanium Oxide (IG
O) and indium zinc oxide (IZO)
In the above-mentioned liquid crystal display device. [17] Resolution of the liquid crystal display device is 140
In the above-mentioned liquid crystal display device which is not less than ppi. [18] The above-mentioned components constituting the liquid crystal display device
Which of the sides of the plate is substantially perpendicular to the rubbing direction
At least one filling port for injecting liquid crystal on one side
And a sealing material for closing the sealing port after liquid crystal injection.
The liquid crystal display device is sealed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Electrode Structure of Fishbone IPS
Structure and the use of transparent conductive material for its electrodes,
High definition and high image quality required for
All of the high aperture ratios can be achieved simultaneously. This
This is a transparent conductive material for fishbone IPS.
Higher definition and higher aperture ratio by using electrical materials
The conflicting relationship has been resolved. FIG. 1 shows a fishbone using a transparent electrode.
A typical schematic plan view of the configuration of the IPS and a cross-sectional view thereof
Indicated. In the fishbone IPS structure, “
Type "pixel electrode 102 and" U-shaped "common electrode 103
Are pixels of the pixel surrounded by the signal wiring 101 and the scanning wiring 104.
In the longitudinal direction of the pixel (in FIG.
Direction). And
Each square-shaped pixel electrode 102 in the pixel is connected at both ends of the pixel
Active element such as a thin film transistor (TFT) 105
It is connected to the signal wiring via the child. Also,
Each square-shaped common electrode in the pixel is connected at both ends of the pixel,
It is integrated with the through wiring. That is, the result at both ends of the pixel
The common electrode 103 and the pixel electrode 102 are interposed via an insulating film 107
And superimposed. In FIG. 1, a pixel electrode is superimposed on a common line.
Configuration. The voltage is common to this pixel electrode 102
It is applied between the electrode 103 and the electric field generated here.
Drive the liquid crystal. The liquid crystal molecules driven by an electric field are applied to each electrode.
The liquid crystal molecules rotate clockwise due to the U-shaped structure.
There is a region that rotates and a region that rotates counterclockwise.
As a liquid crystal material, a positive type liquid crystal (having positive dielectric anisotropy) is used.
Rubbing direction is the scanning wiring 10
4, a negative liquid crystal (having negative dielectric anisotropy).
Rubbing direction is the signal wiring 10
The direction is parallel to 1. The driving directions of the liquid crystal molecules are different in one pixel.
The liquid crystal display device is tilted due to the presence of the two regions.
Color when viewed from the front and a wide field of view
Angle and achieve high image quality as a liquid crystal display.
Can be. There are still other advantages. For high definition
Reduce the pixel pitch and narrow the electrode spacing accordingly
Line and the display area surface in the conventional IPS mode liquid crystal display device.
Within, the unevenness of the brightness due to the variation of the electrode interval occurs. Special
In addition, the processing accuracy is not as good as that of metal electrodes such as chrome.
In the case of bright conductive ITO, the narrower the electrode spacing, the more
Variations in the distance increase, and luminance unevenness is likely to occur. However, it has a fishbone structure
In other words, as can be seen from FIG.
Narrow electrode spacing due to various electrode spacing included
The problem of luminance unevenness caused by this can be solved. this thing
Is as described in the prior art. Thus, in the fishbone IPS,
Effective combination with the transparent conductive film becomes possible, and high definition and
The trade-off of a high aperture ratio can be solved. Therefore, the liquid crystal table
High definition, high aperture ratio, high image quality required for display devices
Achieving all of these requirements at the same time requires pixel electrodes and
And fishbone IP using transparent conductive film for common electrode
S made it possible for the first time. Here, the transparent conductive
Materials include indium tin oxide (ITO) and indium oxide
Zinc (IZO), Indium Germanium Oxide (I
GO) and the like. Further, in this fishbone IPS structure,
Has the advantage that there is a margin in designing the electrode spacing. Subordinate
In conventional S-TFTs and the like, pixels are short-axis
Direction (usually the scanning wiring direction),
In a fishbone structure, the pixels are oriented in the longitudinal direction (usually the signal
This is for dividing in the wiring direction). This is a liquid crystal display
This is a very great advantage for the device. This will be described. Liquid crystal display table
It is known that the display characteristics greatly depend on the liquid crystal material.
You. For example, the driving voltage is the dielectric anisotropy (Δε) of the liquid crystal.
It depends greatly on In such a liquid crystal display device
In order to stabilize display characteristics, the definition of the LCD
Regardless, it is desired to use the same liquid crystal material.
As mentioned above, this fishbone structure
Due to the latitude of the pole spacing design, the
The pole spacing can be set and the same liquid crystal material can be used
Noh. This greatly contributes to productivity improvement. Sa
Furthermore, by using a transparent conductive film, the electrode spacing can be reduced.
Lower driving voltage, that is, lower power consumption
It greatly contributes to electric power. Next, by further devising the electrode structure,
Means to increase the aperture ratio of fishbone IPS
investigated. The specific electrode structure is shown below,
Will be described in detail. (1) Uppermost layer common electrode structure FIG. 2 is an explanatory view of the present electrode structure.
Compared to the bone IPS structure, the common electrode 203 is an insulating film
With a structure formed above the pixel electrode 202 via 206
is there. On the electrode substrate side, the common electrode 203 is
Uppermost layer (closest to the liquid crystal layer) in the electrode group including wiring
The uppermost layer common electrode)
It is called structure. Note that the pixel electrode and the common electrode are transparent electrodes.
In addition, the common electrode is integrated with the common wiring. In such an electrode structure, the voltage of the liquid crystal molecules
Initial orientation direction (rubbing direction) when no voltage is applied and display area
Noise electric field (other than between the common electrode and signal wiring)
Electric field, or an electric field generated between the common electrode and the scanning wiring)
The black mat for light shielding in the signal wiring direction
Rix or black matrix for light shielding in the scanning wiring direction
Either one of the boxes can be made unnecessary. Conventionally, such a black matrix for shading
Is formed on the color filter side, which is the opposite substrate of the electrode substrate.
These substrates are formed during the manufacturing process of the liquid crystal display device.
Misalignment, the aperture ratio of the liquid crystal display
This was one of the factors that led to the decline. Therefore, the shading bra
No need for a matrix
To reduce the aperture ratio due to misalignment.
Leads to control. As a result, the aperture ratio as a liquid crystal display device
Can be improved. Hereinafter, in this electrode structure,
The reason why the black matrix for light becomes unnecessary will be described. As can be seen from the structure shown in FIG.
The electric field applied between the wiring 201 and the common electrode 203
The direction is parallel to the scanning wiring 204, and
Direction of electric field applied between line 204 and common electrode 203
Is in a direction parallel to the signal wiring 201. The polarizing plate is
Cross Nicole arrangement, normally closed mode
(Black display when no voltage is applied). At this time, a positive type liquid crystal (liquid
When the dielectric anisotropy of the crystalline molecule is positive (Δε> 0)
Is the rubbing direction (the initial arrangement of liquid crystal molecules in the state where no voltage is applied).
Direction is the direction perpendicular to the signal wiring (parallel to the scanning wiring)
Direction of the electric field generated between the signal wiring and the uppermost common electrode
Match with direction. Therefore, the liquid crystal molecules in that region are initially
There is no movement from the state, and black display is performed. Therefore, the signal
There is no light leakage near the wiring, which has a self-shading effect,
Eliminates the need for a linear light-blocking black matrix
it can. On the other hand, when a negative liquid crystal is used,
Direction (the initial alignment direction of the liquid crystal molecules when no voltage is applied)
Match) is in the direction parallel to the signal wiring (perpendicular to the scanning wiring).
This corresponds to the direction of the electric field generated between the common electrode and the scanning wiring.
Match. Therefore, the liquid crystal molecules in that region are in the initial state.
It does not move and displays black. Therefore, near the scanning wiring
There is no light leakage on the side and it has a self-shading effect, and the scanning wiring direction
Black matrix for light shielding can be eliminated
You. In particular, the scanning wiring is less likely to be displayed than the signal wiring.
Greatly affects the delay of TFT switches that cause
For this purpose, it is required to reduce the resistance as much as possible. to this
On the other hand, a material with low specific resistance such as aluminum
In addition to using
Low resistance. Therefore, in the present electrode structure, the negative type liquid
The black matrix in this wide scanning wiring direction is
That the use of positive liquid crystal
Aperture ratio rather than eliminating the need for a black matrix
It greatly contributes to improvement. In the case of the positive type liquid crystal and the negative type liquid crystal, the pixel
Since the behavior depending on the direction of the electric field generated in the region is different,
The following characteristics are produced. That is, as compared with the case where the positive type liquid crystal is used,
The final transmittance is higher when the liquid crystal is used. Special
In addition, as the resolution increases, the electrode spacing for applying voltage
It becomes narrower and uses a transparent electrode such as ITO as the electrode material
If so, the difference is large. The following is a description of this point.
I will tell. As in the present electrode structure, two different types of
Electrodes (pixel electrode and common electrode) are formed.
When a voltage is applied between the poles, it is basically flat on the board surface.
A horizontal electric field is generated. However, especially near the electrodes, the liquid crystal layer
The electric field applied to the
An electric field component also occurs. This vertical electric field component narrows the electrode spacing
Indeed, the ratio also increases. In a positive type liquid crystal, the vertical electric field component
Liquid crystal molecules rise with respect to the plate surface. This liquid crystal
Effective refraction as a liquid crystal layer due to the rise of molecules
Rate anisotropy Δn changes and the deviation from the optimal value of Δn
The transmittance decreases. On the other hand, in a negative liquid crystal, the dielectric constant is anisotropic.
Liquid crystal is not affected by the vertical component of the electric field,
The molecule never rises. Therefore, the effective refractive index
The anisotropy Δn is hard to change, and the maximum transmittance does not decrease.
No. Of course, if the aperture ratio is reduced due to higher definition,
Negative type liquid crystal is better than positive type liquid crystal for improving transmittance.
It is effective. Further, in a positive type liquid crystal, this vertical electric field component
There are two directions in which the liquid crystal molecules rise. Both ends of the electrode
The rising direction is different, and the center of the electrode is the boundary.
You. In such a case, light is transmitted at the boundary
The maximum transmission is consequently
It is lower than in the case of using a liquid crystal. In the case of a negative type liquid crystal, it depends on the vertical electric field component.
Liquid crystal molecules do not rise relative to the substrate surface.
Because it rotates only in a plane parallel to the plate surface, a positive-type liquid crystal
Does not occur. In addition, such
The area where the boundary occurs is mainly generated at the center of the comb-teeth electrode.
Use transparent electrode such as ITO as electrode material as in the invention
In such a case, there is a major problem that the transmittance is reduced.
In addition, the ratio of the vertical electric field component increases as the electrode interval decreases.
Therefore, reducing the transmittance at this boundary is a major issue.
come. In FIG. 2, the common electrode is integrated with the common wiring.
are doing. However, common wiring is also transparent due to wiring resistance problems.
When it is difficult to use a bright electrode, as shown in FIG.
In addition, the transparent common electrode 303 in the pixel formed on the uppermost layer is
Through the through hole (contact hole) 309,
Even if it is connected to the metal common wiring 310 formed in the layer.
Good. As a metal material used for wiring, if the resistance is low,
There are no restrictions on chrome, aluminum, copper, etc.
No. Further, in the structure of FIG.
And the scanning wiring 304 are formed in the same layer,
The common wiring 310 is connected to the scanning wiring 3 of the adjacent pixel as shown in FIG.
There is a possibility that a short circuit will occur due to the proximity to the 04. In order to avoid this, generally these common
Increase the distance between the wiring 310 and the scanning wiring 304 of the adjacent pixel.
design. However, this can increase the area where light cannot pass.
And leads to a decrease in the aperture ratio. Then, as shown in FIG.
Such an electrode structure is also conceivable. The common electrode 410 is arranged at the center of the pixel,
In addition, the U-shaped electrode is inverted with the pixel center as the symmetry point
It is arranged. In such a structure, the structure shown in FIG.
It is not necessary to extend the space between useless common wiring and scanning wiring.
The area where light does not pass can be minimized,
The width of the black matrix in the scanning wiring direction can be reduced.
As a result, the aperture ratio can be improved. Also, since the central common electrode portion is wide, a switch is required.
The accuracy of the lure hole is not so required and the productivity is high.
In addition, the V-shaped electrodes are arranged symmetrically with respect to the common wiring.
As a result, the liquid crystal driving method
There will be four regions with different directions. This is the field of view
Excellent in that it can reduce corner enlargement and coloring from oblique directions
Produces an effect. Note that such an electrode structure is similar to the structure shown in FIG.
It is not limited to the electrode structure, but is also suitable for the electrode structure described below.
Can be used. The electrode structure shown in FIG.
Higher aperture ratio can be achieved compared to
The image quality can be further improved. (2) Electrode with common electrode superimposed on signal wiring
Structure The present electrode structure will be described with reference to FIG. This electrode structure is
As compared with the electrode structures shown in FIGS.
The common electrode is stretched in the direction parallel to the scanning wiring.
The end is superposed on the signal wiring. In addition,
The load capacitance formed by the superposition of
To reduce as much as possible the dielectric constant between these electrodes
A low insulating film 511, for example, an organic insulating film is interposed.
You. Note that the common electrode and the pixel electrode are similar to (1) above.
Is made of transparent conductive material, and the common electrode is
Connected to a common wiring made of metal
No. In such an electrode structure, the signal wiring
In a region where the common electrode 501 and the common electrode 503 overlap, an electric field
Is hardly applied and the liquid crystal molecules do not move. That is, this
Light does not leak in the region due to the self-shielding effect. Subordinate
Therefore, the signal is also distributed to the color filter formed on the opposite substrate.
There is no need for a black matrix for light shielding in the line direction.
A reduction in aperture ratio due to misalignment of the substrate can be suppressed. Further, in such an electrode structure,
Compared with the electrode structure shown in (1), the common electrode is
Aperture in the direction parallel to the
Up. Improvement of aperture ratio can be expected by these two effects
You. (3) An electrode in which the common electrode overlaps the scanning wiring
FIG. 6 is a schematic view of the present electrode structure. Fig. 2
As compared with the electrode structure shown in FIG.
Extend the through electrode in the direction parallel to the signal wiring, and
Are superimposed on the scanning wiring. Note that the scanning arrangement
The load capacitance formed by the superposition of the wire and the common electrode
Low dielectric constant between these electrodes to minimize
Insulating film is interposed. In addition, similar to the above (1),
The through electrodes and pixel electrodes are formed of a transparent conductive material,
The pole is connected to a common wiring made of metal through a through hole.
It may be connected. In this structure, the aperture ratio is expected to be improved.
Wear. That is, the signal wiring in the above (2) becomes the scanning wiring.
Considering the replacement point, running on the color filter
The black matrix in the wiring direction is not required. Also,
For the reason explained in the above (1), the signal wiring direction
No rack matrix is required. These two black
Since a matrix is not required,
The resulting reduction in aperture ratio can be greatly suppressed. (4) The common electrode is a scanning wiring and a signal wiring
This electrode structure will be described with reference to FIG. This electrode structure is
Compared to the electrode structure shown in 2-4, the uppermost common electrode
Is extended in both the scanning wiring direction and the signal wiring direction.
The common electrode is superimposed on both the scanning wiring and the signal wiring.
It is made. According to this electrode structure, the electrodes overlap.
Have a self-shading effect in the
Filters block light in the direction of scanning lines and signal lines
Since no black matrix is required,
A higher aperture ratio can be expected than the structures of (2) and (3). Note that, similarly to the above (1), the common electrode and
The pixel electrode is formed of a transparent conductive material, and the common electrode is a through-hole.
Connected to a common wiring made of metal
You may. In the above description, the fishbone structure has pixels
The electrodes and the common electrode were shaped like a letter. However,
Liquid crystal molecules rotate near the bent part of the electrode when an electric field is applied
It is the boundary of areas with different directions. For that,
This results in a so-called reverse domain, and in such areas,
It becomes. Eliminate such domains
In order to transmit light stably in the boundary area,
The through electrodes and the pixel electrodes may have a Y-shaped structure. In FIG.
As shown, both the pixel electrode 802 and the common electrode 803 are transparent.
It is a Y-shaped structure formed of a light conductive film. Each electrode is Y-shaped
The electric field inside the pixel as shown in FIG.
The occurrence of 22 makes it difficult to generate a reverse domain. What
In addition, this Y-shaped electrode structure is described in the above (1) to (1).
Applicable to all structures of (4). The applied electrode structure
This is shown in FIGS. It should be noted that the above (1) to (4) have been described.
2 to 11, the signal wiring and the pixel electrode are the same.
Although it is shown as a case of forming a single layer, signal wiring and
The elementary electrodes may be formed in different layers via an insulating film.
If they are formed in the same layer, the pixel electrode and signal wiring are short.
May be involved. So considering this,
For example, as shown in FIG. 14, the signal wiring and the pixel electrode are on different layers.
Forming can improve production efficiency. In pursuit of improvement in image quality, afterimages and
The solution of the image sticking phenomenon is also an important issue. Say here
The afterimage / image burn-in phenomenon means that one image is displayed for a long time.
When another image is displayed after
This is a phenomenon in which the previous image is displayed at the same time. It should be noted that like fishbone IPS,
Apply voltage between different electrodes formed on one substrate surface.
Produces an electric field approximately parallel to the substrate surface,
By driving liquid crystal molecules in a plane almost parallel to the substrate,
In an IPS type liquid crystal display device that switches light by
Residual charge generated due to residual charge observed in the conventional TN method
It is clear that there are images and afterimages that do not depend on these residual charges.
I'm sorry. Afterimage and image printing independent of the accumulated electric field
The phenomenon described above is a phenomenon peculiar to the IPS system.
As shown in JP 19406,
The rotational torque generated by the in-plane torsional deformation of the liquid crystal molecules.
The alignment film surface that regulates the initial alignment direction of liquid crystal molecules
Is thought to be caused by plastic deformation
I have. About the afterimage phenomenon caused by the residual charge
Considers the liquid crystal display element as a multilayer dielectric, as shown in FIG.
Thus, the path through which the electric field between the common electrode 3 and the pixel electrode 2 passes
Consider a CR equivalent circuit model consisting of a resistor R and a capacitor C.
Then, the relaxation time constant τ (∝C × R) of the whole system is reduced,
By facilitating the discharge of the charges accumulated in the liquid crystal display element,
Can be solved. As a specific means, a voltage is applied.
A dielectric material, that is, an insulating film is formed between the pixel electrode and the common electrode.
It is to intervene as much as possible. For example, in the present invention
Fishbone with a common electrode on the proposed top layer
In the IPS, as shown in FIG.
Is preferably at the bottom layer. In this structure, the common electrode
3 and the pixel electrode 2, an alignment film, a liquid crystal, an alignment film, an insulating film 3
This means that a total of six dielectric layers are interposed. Another afterimage phenomenon independent of residual charge
In the case of, the elastic modulus of the alignment film is increased to suppress plastic deformation.
Japanese Patent Laid-Open No. 10-3194 discloses a solution to this problem.
No. 06 publication. On the other hand, from a study by the present inventors, this alignment film
An afterimage due to plastic deformation of the surface causes an extremely large electric field in the liquid crystal.
Occurs in the area where the rubbing efficiency is applied.
Low area (rubbing fuzz is difficult to hit)
I understood. Then, first, fishbone I
Considering the electrode structure in PS, it has a Y-shaped electrode
In such a structure, the Y-shaped pixel electrodes are alternately arranged in the pixel.
The pole and the central part of the common electrode are as shown in FIG.
As shown in this figure, when the adjacent electrodes overlap each other,
The distance between the electrodes is substantially the insulating film 6 interposed between them.
Equal to the thickness of In such a region, electric field concentration occurs,
An extremely large electric field is generated as compared with other regions in the pixel. This
Results in afterimages due to plastic deformation of the alignment film surface
It becomes. [0124] Also, these electrodes are overlapped.
There is a large electrode step at the part where it is located. Such a step
Rubbing efficiency is low in areas with large
Results. Therefore, in the present invention, fishbone IP
In order to suppress the afterimage phenomenon without deteriorating the features of S, FIG.
As shown in FIG. 2A, the center lines of adjacent Y-shaped electrodes overlap each other.
There was no structure. Further, as shown in FIG.
In addition, on the common electrode 3 formed on the uppermost layer,
A planarizing insulating film 12 for reducing steps due to poles and the like.
Afterimages can also be reduced by applying
Can be controlled. The effect of applying this flattening insulating film
Is the relaxation time τ given the above CR equivalent circuit model.
Is equivalent to reducing the
It is also effective in suppressing the image phenomenon. Next, the high definition of the liquid crystal display device will be described again.
Think twice. Higher definition of liquid crystal display devices requires smaller pixels.
Only the problems caused by the electrode configuration in the pixel
Even if it does not solve. Signal is sent to each pixel by high definition
We need to think about the means of supply. At present, generally, active matrix type liquid crystal
Display devices that use amorphous Si-TFTs
It is tabular. In this case, drive to drive them
IC must be placed and connected around the LCD device
Absent. At present, there are mainly two ways to mount this drive IC.
There are formulas, TCP implementation and FCA implementation. In the TCP implementation, currently about 1
The limit is up to about 30 ppi.
Thinning (for example, display on a 15-inch monitor with the same
In order to do this, about 140 ppi is required
FCA implementation is effective. On the other hand, without using an amorphous Si-TFT,
Active matrix type using polycrystalline Si-TFT
There is a liquid crystal display device. Use of polycrystalline Si-TFT
Allows the drive circuit itself to be incorporated into the pixel.
It becomes possible. By integrating the drive circuit,
For example, a high definition of 200 ppi is possible. In addition,
There are no restrictions on the mounting technology of the conventional drive circuit. Immediately
In a high-definition liquid crystal display device, signals are
Supply and drive, FCA mounting and
Crystal Si-TFT technology is effective. FCA implementation below
Will be described in detail. With higher definition, the pixel pitch will increase
Because of the small size, the interval between the electrode wirings at the time of mounting is also small. T
In CP mounting, the drive IC is made of flexible polyimide etc.
High accuracy due to the connection on the tape of
130 ppi is the limit in the technology used. On the other hand, in the FCA mounting, the driving IC is directly connected to the liquid crystal.
In order to connect on the display element substrate, a resolution of 140 ppi or more
It is possible to cope with fineness. This forms the drive IC
The material (generally Si) is also used for the liquid crystal display element substrate (usually SiO).
Two ) Is also rigid and does not require flexible tape
That's why. Furthermore, in the liquid crystal display device by FCA mounting
Does not use tape and reduces the number of connections
And the possibility of narrowing the picture frame.
There are points. However, the driving IC to be connected and the substrate
There is also a problem that arises due to being hard. FCA implementation
And the electrode pattern and drive of the liquid crystal display element as described above.
After aligning the IC electrode pattern,
Tool from the drive IC side and pressurize under high temperature and high pressure conditions.
To wear. Usually, the temperature at the time of pressure bonding is about 170 ° C. In such a case, the material for forming the driving IC
(Generally Si) and the material of the liquid crystal display element substrate (Si
O Two ) Has a different coefficient of thermal expansion.
Occurs, resulting in poor connection at the connection points, and the image cannot be displayed normally.
I can't. In order to solve this, (1) drive I
Place a stress relaxation material between C and the liquid crystal display element substrate.
And (2) the material for forming the driving IC and the liquid crystal display element substrate.
Make the thermal expansion coefficient of the material almost the same, (3) Add heat
Without connecting the drive IC with the UV curable resin
investigated. A stress relaxation material is arranged in contact with the drive IC and the substrate
Is generated between the driving IC and the liquid crystal display element substrate.
It absorbs stress strain and can solve poor connection. Also, both materials
If the thermal expansion coefficient is designed to be almost the same,
Hardly occurs. In addition, using ultraviolet curing resin
If wires are connected at room temperature without applying heat, the coefficient of thermal expansion between each material
No stress-strain occurs regardless of the difference between Another problem other than stress strain in FCA mounting
There is. Heat generated by the drive IC is directly applied to the liquid crystal display element substrate
And the heat increases the temperature of the liquid crystal, for example,
Exceeding the Tni point (liquid crystal phase / isotropic phase transition temperature)
As a result, uneven brightness occurs around the liquid crystal display element. In particular,
IPS liquid crystal display devices require high driving voltage
Therefore, a high-output drive IC must be used. But this
Such high-output drive ICs easily generate high heat, and
The luminance unevenness in the periphery is remarkable. To solve this problem, a drive IC and a liquid crystal display
Placing heat insulating material or heat absorbing material between the device substrate
It was investigated. Place the heat insulating material or heat absorbing material in this way,
Alternatively, by enclosing the drive IC with these materials,
To transfer the heat generated by the drive IC to the liquid crystal display element substrate.
Suppress. Finally, the productivity will be described. Partially described
As you can see, what definition of fishbone structure
Need not change the liquid crystal material
Showed that productivity could be improved.
The manufacturing process will be described. At present, in the manufacturing process of a liquid crystal display device,
Most of the manufacturing time is spent in the process of injecting liquid crystal into the liquid crystal display.
is there. In the liquid crystal injection process, the inside of the liquid crystal display element is generally evacuated.
State, and then fill the liquid crystal display
Liquid crystal is injected. Basically the penetration of liquid crystal is in the rubbing direction
Direction is the fastest, and the direction perpendicular to the rubbing direction is
Slowest. Therefore, as shown in FIG.
9 should be placed on the side almost perpendicular to the rubbing direction 17
No. In the fishbone IPS structure,
When di-type liquid crystal is used, the rubbing direction 17 is a liquid crystal display.
Since the direction is almost parallel to the long axis of the element,
A liquid crystal injection port 19 may be arranged on the short axis side of the device (FIG. 1).
6 (a)). When a negative liquid crystal is used, Rabin
Direction 17 is a direction substantially parallel to the short axis of the liquid crystal display element.
Therefore, the liquid crystal injection port 19 is provided on the long side of the liquid crystal display element.
It may be arranged (FIG. 16B). This results in production efficiency
Can be improved. Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Will be described. In this embodiment, a 14.1 inch liquid crystal display is particularly used.
About 141 ppi specification (UXGA equivalent) in equipment
To evaluate and inspect image quality such as aperture ratio, viewing angle, and coloring.
As discussed, the invention is not limited to this definition;
It can be applied to the above definition. [Embodiment 1] The liquid crystal display device of this embodiment
FIG. 1 shows a schematic view of the pixel portion of FIG. In addition, FIG.
The equivalent circuit of the trick part and its peripheral circuits are shown. Liquid crystal display device
Pixel IPS, and a pixel electrode formed on the same substrate.
A voltage is applied between the pole 102 and the common electrode 103,
Liquid crystal molecules caused by an electric field that is almost parallel to the substrate surface
To control the optical state and display an image. The display section of the liquid crystal display element is 14.1 inches diagonally.
And the resolution is 141 ppi (UXGA equivalent).
You. The pixel pitch is 180 micrometers (μm)
It is. The substrate on which the liquid crystal display element is formed has a thickness of 0.7.
A glass substrate whose surface was polished in mm was used. On one glass substrate 108, the signal wiring 1
01, scanning wiring 104 and common wiring 103 in a matrix
Formed. First, the scanning wiring 104 is shared with a glass substrate.
After forming the interconnect 103, the insulating layer is formed using SiN.
(First insulating film 107) was formed. In addition, the insulating layer
A signal wiring 101 and a pixel electrode 102 were formed thereon.
After that, an insulating layer (second insulating film 106) was stacked. In addition,
The through electrodes are integrated with the common wiring. The pixel electrode 102 is made of an amorphous silicon.
Via the thin film transistor 105 formed by the capacitor
It is connected to the signal wiring 101. Here, the signal wiring 10
1. The scanning wiring 104 is formed of chromium, and the pixel electrode 1
02, the common electrode 103 is formed using a transparent conductive film ITO
did. For the material of the signal wiring 101 and the scanning wiring 104
Is not a problem if the electric resistance is low.
Minium, copper or the like may be used. Further, the pixel electrode 102 and the
For the common electrode 103, a transparent conductive film such as IZO or IGO is used.
May be. Each pixel is a thin film transistor (TFT) 10
5, a pixel electrode 102 and a common electrode 103,
A pressure is generated between the pixel electrode 102 and the common electrode 103.
The liquid crystal is driven by the generated electric field. Next, the manufacturing process of the liquid crystal display device is shown in FIG.
It will be described using FIG. The opposite glass substrate 9 has a stripe shape
RGB color filter 23 and black matrix
24. Color filters and bra
Overcoat for flattening on the backing matrix
A resin 22 was formed. Epo as an overcoat resin
A xy resin was used. Next, liquid crystal molecules are arranged on the surfaces of both glass substrates.
The necessary polyimide alignment film 21 was formed.
In general, polyimide film is a precursor of polyamic
Apply acid on a glass substrate with a printing machine and bake at high temperature.
Formed by Next, align the liquid crystal molecules
Orientation treatment was performed. Orientation treatment on both glass substrates
Rubbing treatment of the surface of the formed polyimide alignment film 21
It was done by doing. Rubbing machine for rubbing
Use rubbing rolls with rayon buff cloth
Was. The rubbing direction should be parallel to the long side of the glass substrate.
Was. A sheet is formed on the periphery of the display area of one glass substrate.
(Thermosetting resin) and stack the opposing glass substrates
After matching, pressurize while heating to bond and fix both substrates.
Was. 4 microphone gaps between glass substrates (liquid crystal layer thickness)
Meters (μm). In addition, the liquid crystal is a liquid crystal display element.
The injection port for injection into the inside is formed on the short side of the glass substrate.
Done. After that, liquid crystal is injected from the injection port by vacuum encapsulation.
And the inlet was sealed with an ultraviolet curable resin. In addition, the real
In the example, a positive type liquid crystal was used. A polarizing plate 2 is provided on both sides of the combined glass substrate.
5 was completed to complete the liquid crystal display element. In addition, the polarizing plate
Has a crossed Nicols arrangement, and the liquid crystal display
Characteristics (black display at low voltage, white display at high voltage)
I stuck it. Further, as shown in FIG.
The scanning wiring drive circuit 27 for the liquid crystal display element and the signal wiring drive
Connects circuit 28, power supply circuit and control circuit 30
Supplies scanning signal voltage, signal voltage, and timing signal
Then, active matrix driving was performed. Thereafter, the liquid crystal display device shown in FIG.
Shield case 32, diffusion plate 33, light guide 34, reflection plate 3
5, backlight 36, lower case 37, inverter times
The liquid crystal display 39
Was assembled. Liquid crystal display device assembled in this way
Were evaluated for display characteristics. Assembled in this example
The liquid crystal display element has the same high definition as 141 ppi.
Sometimes high aperture ratio due to use of transparent electrode ITO
(.About.40%). In the conventional IPS, the distance between the electrodes is reduced.
Luminance due to variations in electrode spacing, which was feared to occur
I did not see any unevenness. Images such as viewing angle and contrast ratio
S-IPS is said to be the highest still image quality.
Almost the same, with a viewing angle of 170 degrees (contrast ratio of 10
Above), a contrast ratio of 350: 1, and an oblique
There was no coloring when viewing the screen from the direction. Thus, high definition, high image quality, high aperture ratio and
Liquid crystal display device which achieves all of the three items simultaneously
I was able to. [Embodiment 2] The liquid crystal display device of this embodiment
FIG. 2 shows a schematic diagram of the pixel portion. The common electrode in the pixel is the pixel
It is above the layer on which the electrodes are formed.
The top layer on the electrode substrate, and
On the color filter side substrate
This embodiment differs from the first embodiment in that no tricks are required. The size, resolution and pixels of the liquid crystal display element
The pitch is 14.1 inches, 141 pp, as in the first embodiment.
i (UXGA equivalent), pixel pitch 180 micrometers
(Μm). The substrate on which the liquid crystal display element is formed
A glass substrate having a thickness of 0.7 mm and a polished surface was used. The scanning wiring 20 is placed on one glass substrate 208.
4 and then the insulating layer 207 is formed using SiN.
Done. Furthermore, the signal wiring 201 and the
After forming the pixel electrode 202, an insulating layer 206 is laminated.
Was. Thereafter, a common electrode 203 was further formed. In addition,
The through electrodes are integrated with the common wiring. The pixel electrode 202 is made of an amorphous silicon.
Via a thin film transistor 205 formed by a capacitor
It is connected to the signal wiring 201. Here is the signal wiring, running
The scan wiring is made of chrome, and the pixel electrode and common electrode are transparent.
It was formed using bright conductive film ITO. Signal wiring and scanning
There is no particular problem if the wiring material has low electric resistance.
Alternatively, aluminum, copper or the like may be used. The pixel electrode and the common electrode have IZO
Or a transparent conductive film such as IGO. Each pixel is a thin film tiger
Transistor (TFT), pixel electrode, and common electrode
Voltage is generated between these pixel electrodes and the common electrode
The liquid crystal is driven by the electric field. In this embodiment, the common electrode and the common wiring are
Integrated and made of transparent conductive film ITO
However, if the resistance of the wiring material is a problem, for example,
Interconnects are formed of a metal material, and in a lower layer different from the common electrode
And connect the common wiring and common electrode through through holes.
You may continue. The electrode structure with this through hole
The results of this study will be described in Example 3 below. On the other hand, the opposite glass substrate has a stripe shape.
RGB color filter and black matrix
It has a combined structure. In addition, black in the signal wiring direction
No matrix is formed. The following liquid crystal display assembly
The erecting step is the same as in the first embodiment. The liquid crystal display device assembled in this manner is
Then, the display characteristics were evaluated. Liquid crystal display element of this embodiment
Has a high aperture of 141 ppi and a high aperture
Rate (-45%). In this embodiment
The main reason for the high aperture ratio is that the opposing color filter substrate
Black matrix is formed in the part (signal wiring direction)
Is caused by the conventional misalignment of the substrate.
This is because the lowering of the aperture ratio, which has been performed, can be suppressed. Further, as in the first embodiment, the variation in the electrode interval
No luminance unevenness due to sticking was observed. Viewing angle and contra
It is said to be the highest still image in terms of image quality such as strike ratio
It is almost equivalent to S-IPS, with a viewing angle of 170 degrees (control
(Last ratio 10 or more), contrast ratio 350: 1,
Also, there was no coloring when viewing the screen from an oblique direction. Thus, high definition, high image quality, high aperture ratio and
It is possible to obtain a liquid crystal display device that simultaneously achieves the three items described above.
did it. [Embodiment 3] The liquid crystal display device of this embodiment
FIG. 3 shows a schematic diagram of the pixel portion. In the second embodiment, the common electrode
Integrated with common wiring, common wiring is transparent conductive film IT
O was formed. This integration is performed as described in the second embodiment.
It wasn't a problem that would greatly degrade the quality,
For example, depending on the wiring resistance, a signal delay problem may occur.
There is a potential. Therefore, in this embodiment, the common electrode 303 and the common electrode 303 are shared.
The communication wires 310 are separately formed, and the contact holes 309 are formed.
Through the electrode structure. Here
A transparent conductive material ITO is provided on the through electrode 303 and the common wiring 310 is provided.
Chromium metal was used. The liquid prepared in this example
Crystal display element size, resolution and pixel pitch are examples
14.1 inch, 141 ppi (UXGA phase)
), With a pixel pitch of 180 micrometers (μm)
You. First, the scanning wiring 30 is placed on the glass substrate 308.
4 and the common wiring 310 were formed of metal chromium. That
After that, an insulating layer 307 is formed using SiN,
After forming the signal wiring 301 and the pixel electrode 302,
Layer 306 was laminated. Then, the connection between the common electrode and the common wiring
Forming a contact hole 309 for securing connection
Then, the common electrode 303 was formed by ITO. The pixel electrode 302 is made of an amorphous silicon.
Through the thin film transistor 305 formed by the capacitor
It is connected to the signal wiring 301. The voltage is
The liquid crystal is driven by the electric field generated between the pole and the common electrode
I do. Note that the assembly process of the liquid crystal display element is the same as that of the second embodiment.
The same is true. Display of the assembled liquid crystal display device
The properties were evaluated. The display characteristics are almost the same as those of the second embodiment.
Simultaneously, three items of high definition, high image quality, and high aperture ratio
Was obtained. These
The structure is made of chrome or aluminum with low resistance as a material for common wiring
Metal electrodes such as nickel are easy to use and problems such as signal delay
Did not occur. [Embodiment 4] The liquid crystal display device of this embodiment
FIG. 4 is a schematic diagram of the pixel portion. Electrode structure in this embodiment
The feature of the structure is that the common electrode and the common wiring are not
Common wiring connected through contact holes
It is arranged in the pixel central part in the direction parallel to the scanning wiring,
With the center of the pixel as the point of symmetry, the directions of the V-shaped electrodes are arranged symmetrically.
Is placed. The liquid crystal display device manufactured in this example was
The size, the resolution and the pixel pitch are 1 as in the first embodiment.
4.1 inch, 141 ppi (UXGA equivalent), pixel pixel
Switch 180 micrometers (μm). First, the scanning wiring 40 is placed on the glass substrate 408.
4 and the common wiring 410 were formed of chromium metal. That
After that, an insulating film 407 is formed using SiN,
After forming the signal wiring 401 and the pixel electrode 402, the second insulating
The film 406 was stacked. Thereafter, the common arrangement with the common electrode 403 is performed.
Contact hole 40 for securing connection of line 410
9 (through hole), and then the common electrode 403 is formed.
Formed by ITO. The pixel electrode 402 is made of an amorphous silicon.
Via the thin film transistor 405 formed by the capacitor
It is connected to the signal wiring 401. The voltage is
The electric field generated between the pole 402 and the common electrode 403 causes
To drive the liquid crystal. Subsequent assembly work of the liquid crystal display element
The process is the same as in the second embodiment. The liquid crystal display device assembled as described above is
Then, the display characteristics were evaluated. Example 2 for aperture ratio
And a high aperture ratio almost the same as that of Example 3 can be realized.
Was. Furthermore, the image quality, especially the color
Significant suppression was achieved. This draws a squared electrode
As a result of the opposite arrangement at the symmetric point of the elementary center,
Four regions with different directions of liquid crystal molecule rotation exist in one pixel
It is thought that there is. In the liquid crystal display device of this embodiment,
Is more productive than the liquid crystal display device of the third embodiment.
Great degree. There are two reasons, one is the central part of the pixel
There is a region of the common electrode that is almost diamond-shaped, and this region is
This is due to the fact that the contact hole is easy to form due to its large size.
Another is that the common wiring 310 is arranged in the center of the pixel.
To the scanning wiring 304 formed in the same layer.
No short circuit (FIG. 3). In the electrode structure of the third embodiment (FIG. 3), the pixel
Since the common wiring 310 is arranged at the end,
There is a possibility of short-circuit with the scanning wiring of the pixel.
In consideration of productivity, the common wiring of adjacent pixels
The design is such that the space between the wirings is widened. This does not transmit light
Area is increased, resulting in a lower aperture ratio.
There is a possibility to make it. In this embodiment, this problem is avoided in advance.
There is no problem of lowering the aperture ratio due to this reason.
An aperture ratio can be achieved. [Embodiment 5] The liquid crystal display device in this embodiment
FIG. 5 shows a schematic view of the pixel portion of FIG. In this embodiment, the following 4
This is different from the first embodiment in two points. The liquid prepared in the examples
Crystal display element size, resolution and pixel pitch are examples
14.1 inch, 141 ppi (UXGA phase)
), With a pixel pitch of 180 micrometers (μm)
You. The common electrode in the pixel is formed on the uppermost layer
So that part of the common electrode in the pixel overlaps the signal wiring
In order to reduce the capacitive load caused by the superposition.
In a color filter substrate having a low-capacity insulating film,
Has no black matrix. First, the scanning wiring 50 is placed on the glass substrate 508.
4 was formed of metallic chromium. Then, using SiN,
One insulating film 507 is formed, and the signal wiring 501 and
After forming the pixel electrode 502 and the second insulating film 506,
Layered. The pixel electrode 502 is made of amorphous silicon.
Signal distribution via a thin film transistor 505 formed by
Connected to line 501. Next, the third insulating film (low capacity
An insulating film 511 is formed, and a common electrode 503 is formed thereon.
Done. As can be seen from the cross-sectional view, the common electrode 5
03 overlaps with the signal wiring 501 via a two-layer insulating film.
Tatami. The low-capacity insulating film 511 is formed by this superposition.
To reduce the capacitance between the common electrode and the signal wiring.
It is. Note that the low-capacity insulating film 511 has a low dielectric constant.
It is desirable to use either an organic material or an inorganic material.
In this embodiment, the common electrode and the common wiring are integrated.
However, as in Examples 3 and 4, different layers and different electrodes are used.
Each made of a pole material and through a contact hole
May be connected. The voltage is applied to these pixel electrode and common electrode.
The liquid crystal is driven by the electric field generated during the period. After this
The assembling process of the liquid crystal display element is the same as in the second embodiment. The assembled liquid crystal display device
The display characteristics were evaluated. Liquid crystal table assembled in this example
The display element has a high definition of 141 ppi,
A high aperture ratio (〜50%) can be achieved. Main reason for increasing the aperture ratio in this embodiment
On a part of the opposing color filter substrate (in the signal wiring direction)
Due to the lack of a black matrix,
Of the aperture ratio caused by the misalignment of the substrate
And the common electrode was superimposed on the signal wiring.
Has increased the area without electrodes in the pixel
is there. Also, as in the first embodiment, the variation in the electrode spacing
No luminance unevenness due to sticking was observed. Viewing angle and contra
It is said to be the highest still image in terms of image quality such as strike ratio
It is almost equivalent to S-IPS, with a viewing angle of 170 degrees (control
(Last ratio 10 or more), contrast ratio 350: 1
And there is no coloring when viewing the screen from an oblique direction.
Was. Thus, high definition, high image quality, high aperture ratio and
It is possible to obtain a liquid crystal display device that simultaneously achieves the three items described above.
did it. [Embodiment 6] The liquid crystal display device in this embodiment
FIG. 6 shows a schematic diagram of the pixel portion of FIG. In this embodiment, the following 4
This is different from the first embodiment in two points. In addition, it produced in this example.
Liquid crystal display element size, resolution and pixel pitch are implemented
14.1 inch, 141 ppi (UXGA) as in Example 1.
Equivalent), with a pixel pitch of 180 micrometers (μm).
You. The common electrode in the pixel is formed on the uppermost layer.
So that part of the common electrode in the pixel overlaps the scanning wiring
In order to reduce the capacitive load caused by the superposition.
In a color filter substrate having a low-capacity insulating film, signal wiring and scanning
It does not have a black matrix in the direction in which the wiring extends. First, the scanning wiring 60 is placed on the glass substrate 608.
4 was formed of metallic chromium. Then, using SiN,
One insulating film 607 is formed, and further, the signal wiring 601 and
After forming the pixel electrode 602 and the second insulating film 606,
Layered. The pixel electrode 602 is made of amorphous silicon.
Signal distribution via a thin film transistor 605 formed by
Connected to line 601. After that, the low-capacity insulating film 61
1 and a common electrode 603 was formed thereon. What
A part of the common electrode 603 as can be seen from the cross-sectional view.
Overlap with the scanning wiring 604 via an insulating film. Low
The capacitor insulating film 611 is connected to a common electrode generated by the superposition.
This is for reducing the capacitance between the scanning lines. Low volume
It is desirable that the insulating film has a low dielectric constant,
Any of the machine materials may be used. In this embodiment, the common electrode and the common wiring are
Although they are integrated, as in Examples 3 and 4,
And contacts made of different electrode materials
You may connect via a hole. The voltage is applied to these pixel electrodes
The liquid crystal is driven by the electric field generated between
You. The subsequent steps of assembling the liquid crystal display element are the same as those of the second embodiment.
The same is true. The liquid crystal display thus assembled is described
The display characteristics were evaluated. The liquid crystal display device of this embodiment is
It has a high definition of 141 ppi and a high aperture ratio.
(~ 50%). High in this embodiment
The main reason for increasing the aperture ratio is that the color filter substrate
The lack of a matrix
Suppress reduction in aperture ratio caused by misalignment of substrate
It was possible. Also, as in the first embodiment, the electrode spacing
No unevenness in luminance due to the variation in the brightness was observed. Viewing angle
Image quality such as contrast ratio is also said to be the highest still image
170-degree viewing angle
(Contrast ratio 10 or more), contrast ratio 350:
1, and coloration when viewing the screen from an oblique direction
Did not. Thus, high definition, high image quality and high aperture ratio can be obtained.
A liquid crystal display device that can be achieved at the same time was obtained. [Embodiment 7] The liquid crystal display device of this embodiment
FIG. 7 shows a schematic view of the pixel portion of FIG. In this embodiment, the following 4
This is different from the first embodiment in two points. The liquid prepared in the examples
Crystal display element size, resolution and pixel pitch are examples
14.1 inch, 141 ppi (UXGA phase)
), With a pixel pitch of 180 micrometers (μm)
You. The common electrode in the pixel is formed on the uppermost layer
Some of the common electrodes in the pixel are used for signal wiring and scanning wiring
In order to reduce the capacitive load caused by the superposition.
In a color filter substrate having a low-capacity insulating film, signal wiring and scanning
It does not have a black matrix in the direction in which the wiring extends. First, the scanning wiring 70 is placed on the glass substrate 708.
4 was formed of metallic chromium. Then, using SiN,
One insulating film 707 is formed, and the signal wiring 701 and
After the pixel electrode 702 is formed, the second insulating film 706 is laminated.
Was. Pixel electrode 702 is formed of amorphous silicon
Wiring 701 via the thin film transistor 705
It is connected to the. Thereafter, a low-capacity insulating film 711 is formed.
Then, a common electrode 703 was formed thereon. In addition, the sectional view
As can be seen from FIG.
04 and the signal wiring 701 via an insulating film.
You. The low-capacity insulating film 711 is formed by this superposition.
To reduce the capacitance between the common electrode and the scanning line.
It is. A low-capacity insulating film with a low dielectric constant is desirable.
Alternatively, either an organic material or an inorganic material may be used. In this embodiment, the common electrode and the common wiring are
Although they are integrated, as in Examples 3 and 4,
And contacts made of different electrode materials
You may connect via a hole. The voltage is applied to these pixel electrodes
The liquid crystal is driven by the electric field generated between
You. The subsequent assembly process of the liquid crystal display element
This is the same as in the second embodiment. The liquid crystal display thus assembled is described
The display characteristics were evaluated. Liquid crystal table assembled in this example
The display element has a high definition of 141 ppi,
A high aperture ratio (〜52%) can be achieved. In this embodiment
The main reason for the high aperture ratio in the color filter
That no black matrix is formed on the plate,
The common electrode is superimposed on the signal wiring
That is, the area without electrodes has expanded. Further, as in the first embodiment, the variation in the electrode interval
No luminance unevenness due to sticking was observed. Viewing angle and contra
It is said to be the highest still image in terms of image quality such as strike ratio
It is almost equivalent to S-IPS, with a viewing angle of 170 degrees (control
(Last ratio 10 or more), contrast ratio 350: 1
Also, there was no coloring when viewing the screen from an oblique direction. Thus, high definition, high image quality, high aperture ratio and
It is possible to obtain a liquid crystal display device that simultaneously achieves the three items described above.
did it. [Embodiment 8] A liquid crystal display device according to this embodiment.
FIG. 8 shows a schematic view of the pixel portion of FIG. In this embodiment, the common
Example 2 differs from Example 1 in that the shapes of the poles and pixel electrodes are different.
You. The common electrode and the pixel electrode are Y-shaped. What
Note that the size, resolution, and
And the pixel pitch is 14.1 inches and 14 pixels as in the first embodiment.
1 ppi (UXGA equivalent), pixel pitch 180 micro
Meter (μm). First, the scanning wiring 80 is placed on the glass substrate 808.
4 and a common wiring integrated with the common electrode 803 are formed.
did. After that, a first insulating film 807 is formed using SiN.
Further, the signal wiring 801 and the pixel electrode 802 are formed.
After the formation, the second insulating film 806 was stacked. The pixel electrode 802 is made of amorphous silicon
Signal distribution via the thin film transistor 805 formed by
Connected to line 801. Signal wiring and scanning wiring
Chrome metal, Y-shaped pixel electrode and Y-shaped common electrode
It was formed with an ITO transparent electrode. In the present embodiment, the V-shaped electrode is replaced with a Y-shaped electrode.
By doing so, the reverse domain that occurred at the center of the pixel
It is a measure for in. The voltage is shared with these pixel electrodes.
The liquid crystal is driven by an electric field generated between the liquid crystal and the electrode.
The subsequent steps for assembling the liquid crystal display element are described in the examples.
Same as 1. The thus assembled liquid crystal display device is
The display characteristics were evaluated. Liquid crystal table assembled in this example
The display element has a high definition of 141 ppi,
A high aperture ratio (〜40%) can be achieved. Also implemented
As in Example 1, luminance unevenness due to variations in electrode spacing was also observed.
I couldn't. Image quality such as viewing angle and contrast ratio
Is almost equivalent to S-IPS which is said to be the highest still image
Yes, viewing angle 170 degrees (contrast ratio 10 or more),
The contrast ratio is 350: 1, and the screen is viewed from an oblique direction.
There was no coloring when I saw it. As a result, high definition, high image quality, high aperture ratio and
It is possible to obtain a liquid crystal display device that simultaneously achieves the three items described above.
did it. In addition, the results of the study conducted in Examples 2 to 7
Shows the same effect also in the Y-shaped electrode. Respectively
A typical electrode structure using a Y-shaped electrode corresponding to
9 to 11. In the Y-shaped electrode structure,
Also, the common electrode and common wiring are formed independently,
Alternatively, the connection may be made through a via hole. [Embodiment 9] A liquid crystal display device according to this embodiment.
FIG. 12A is a schematic view of the pixel portion of FIG. Do you understand from the figure
To the adjacent Y-shaped pixel electrode 2 and common electrode 3
Complete the region where the center line overlaps via the insulating film.
The structure has been completely eliminated. In addition, the liquid crystal manufactured in the example
Example 1 The size, resolution and pixel pitch of the display element
14.1 inch, 141 ppi (UXGA phase)
), With a pixel pitch of 180 micrometers (μm)
You. Also, the center line of the adjacent common electrode and the pixel electrode overlaps
Except that the assembly process of the LCD is
This is similar to the eighth embodiment. The assembled liquid crystal display device
The display characteristics were evaluated. Liquid crystal table assembled in this example
The display element has a high definition of 141 ppi,
As in Example 8, a high aperture ratio (開口 40%) can be achieved.
I have. Here, the afterimage was particularly evaluated. Quantitative evaluation of image sticking and afterimage of liquid crystal display
Oscilloscope combined with photodiode to evaluate
It was evaluated using a scope. First, the window pattern at the maximum brightness is displayed on the screen.
Display for 30 minutes, after which the afterimage is most noticeable
Display screen so that the brightness is 10% of the maximum brightness
Switching the whole surface, the pattern at the edge of the window disappears
Time until the image is
Of the luminance variation of the luminance B between the afterimage portion and the peripheral halftone portion
The magnitude ΔB / B (10%) was evaluated as the afterimage intensity. However
However, the allowable afterimage intensity is 3% or less. The liquid crystal display device of this embodiment described above is
As a result of evaluating the residual image, the residual image intensity was 1%.
Image afterimage inspection by image sticking and afterimage
High display (image quality) characteristics
Was done. An electrode structure in which electrode portions are overlapped (FIG. 1)
2 (b)) is described in Comparative Example 1 below.
Bell. [Embodiment 10] The liquid crystal display device of this embodiment
FIG. 13 shows a schematic view of the pixel portion of the device. You can see from the figure
In addition to the electrode structure in the ninth embodiment, the uppermost layer is flattened.
This is a structure in which an insulating film 120 is applied and formed. In addition, the real
The size, resolution, and image size of the liquid crystal display
The elementary pitch is 14.1 inches, 141p as in the first embodiment.
pi (UXGA equivalent), pixel pitch 180 micrometer
(Μm). In addition, the adjacent common electrode and pixel electrode
Except that the center lines do not overlap,
The assembling process is the same as in the eighth embodiment. The liquid crystal display device assembled in this manner is
The display characteristics were evaluated. The liquid crystal display device of this embodiment is
At the same time as high resolution of 141 ppi,
Similarly, a high aperture ratio (〜40%) was achieved. Here is a special
Were evaluated for afterimages. Quantitative evaluation of image sticking and afterimage of liquid crystal display
Oscilloscope combined with photodiode to evaluate
It was evaluated using a scope. First, the pattern of the window with the maximum brightness is displayed on the screen.
Display for 30 minutes, after which the afterimage is most noticeable
Display screen so that the brightness is 10% of the maximum brightness
Switching the whole surface, the pattern at the edge of the window disappears
Time until the image is
The magnitude of the luminance variation of the luminance B between the afterimage part and the peripheral halftone part
The value ΔB / B (10%) was evaluated as the afterimage intensity. However
However, the allowable afterimage intensity is 3% or less. As described above, the liquid crystal display device of this embodiment has
As a result, the residual image intensity was 0.5%.
Image burn-in even in visual image persistence inspection
No display unevenness due to afterimages
The indicated (image quality) characteristics were obtained. [Embodiment 11] As described above, for example,
The liquid crystal display device having the vertical electrode structure shown in FIGS.
In other words, the signal lines 501 and 601 and the pixel electrodes 502 and 6
02 is formed in the same layer and close to each other,
It may cause problems such as entanglement. Increase productivity
One way to do this is to form these electrodes in different layers. Different stratum
For example, as shown in FIG.
Considering the layers that can be placed, there are two types of electrode vertical structures. However, considering an afterimage caused by accumulated charges,
In this case, the image quality is influenced by the occurrence of an afterimage.
Therefore, in the present embodiment, the electric power shown in FIGS.
The afterimage was evaluated by a liquid crystal display having an extremely vertical structure.
The size and resolution of the liquid crystal display device manufactured in this example
The degree and the pixel pitch are 14.1 inches as in the first embodiment,
141 ppi (UXGA equivalent), pixel pitch 180 my
Chromator (μm). In addition, the combination of liquid crystal display
The erecting step is the same as in the fifth embodiment. For each electrode vertical structure
The liquid crystal display devices are 14 (a) and 14 (b). The assembled liquid crystal display device
Then, the afterimage characteristics were evaluated. LCD image sticking,
Combines photodiodes to quantitatively evaluate afterimages
The evaluation was performed using the oscilloscope. First, the pattern of the window with the maximum brightness is displayed on the screen.
Display for 30 minutes, after which the afterimage is most noticeable
Display screen so that the brightness is 10% of the maximum brightness
Switching the whole surface, the pattern at the edge of the window disappears
Time until the image is
The magnitude of the luminance variation of the luminance B between the afterimage part and the peripheral halftone part
The value ΔB / B (10%) was evaluated as the afterimage intensity. However
However, the allowable afterimage intensity is 3% or less. As described above, the liquid crystal display device of this embodiment has the following advantages.
As a result, the residual image intensity was 1.5% for both.
But the time until the afterimage completely disappears is 1
It was confirmed that (b) was several minutes longer than 4 (a). This
Consider a CR equivalent circuit model as shown in FIG.
If it is relaxed, there is less dielectric material between the electrodes.
This is because the number τ increases. From this, the pixel electrode
-Liquid crystal-the path of electric lines of force passing through the common electrode
It has been found that it is better to interpose as many dielectrics as possible. [Embodiment 12] The liquid crystal display element of this embodiment
The structure of the child is the same as that of the first embodiment. This liquid crystal display element
Displays an image if no signal is supplied to signal wiring and scanning wiring
I can't. The drive signal for displaying this image
The driver IC supplies the signal. The common wiring, signal wiring, and scanning wiring from each pixel
Each of the wires extends to the periphery of the substrate, and the power of the drive IC is
Configure an electrode pattern that corresponds one-to-one with the electrode pattern.
Has formed. FIG. 15A shows the conventional FCA mounting.
As described above, the driving IC 12 includes the Au bump 13 and the anisotropic conductive film.
Electrode pattern formed on substrate 8 via (ACF) 15
Connected to the power line 14. On the other hand, the structure of this embodiment is shown in FIG.
Indicated. Adhesion of drive IC 12 on substrate 8 of liquid crystal display element
Drive IC and liquid crystal display element substrate after thermocompression bonding
Buffer material 1 for alleviating stress strain generated between
6 was formed. The cushioning material used here depends on the drive IC.
Heat-resistant material that does not deteriorate due to heat generation
At the same time, the heat of the drive IC is transmitted to the liquid crystal display element substrate.
It is desirable to use a material that has the effect of heat insulation and heat absorption. Further, contact holes are formed in the stress buffering material.
The drive IC electrodes and the liquid crystal display are formed
The electrodes of the display element are connected, and necessary signals are supplied to the pixels.
You. The assembling process of this liquid crystal display element is the same as in the first embodiment.
It is. The liquid crystal display device thus obtained is made of FCA
The problem of stress-strain, which is a major issue in mounting, and the driving I
The problem of peripheral brightness unevenness caused by the heat of C was simultaneously solved.
Pixels that are not lit due to fine and poor connection (point defects,
The image quality without line defects was also good. Embodiment 13 Using Polycrystalline Si-TFT
The drive circuit itself in the pixel
Is possible. Because the drive circuit can be integrated
For example, high definition such as 200 ppi is also possible.
In addition, there are no restrictions on the mounting technology of conventional drive circuits.
You. In this embodiment, a polycrystalline Si-TFT is used as an active element.
Results of study on transparent electrode fishbone IPS
Is described. FIG. 21 shows a peripheral drive circuit and a TFT active circuit.
Liquid crystal display device with integrated matrix on the same substrate.
It shows an equivalent circuit of the body. The pixel portion 952 and the TFT 951, and the
Scanning circuit 953 for driving the video signal for one scanning line
To divide the signal into multiple blocks and supply them in a time-sharing manner
Horizontal scanning circuit 954 for supplying video signal data.
Data signal lines Vdr1, Vdg1, Vdb1,.
Switch matrix to be supplied to the pixel unit for each divided block
A circuit 955, a scanning wiring 956, and a signal wiring 957.
It is. FIG. 22 shows a TFT activator according to this embodiment.
FIG. 4 is a sectional view of a live matrix section. Glass substrate 9 from below
68, buffer layer 969, intrinsic semiconductor layer 900, low resistance
n-type semiconductor layer 902, high-resistance n-type semiconductor layer 903, gate
Insulating film 904, through-hole 905, source electrode 9
58, signal wiring 957, interlayer insulating film 906, contact
Hole 960, first gate electrode 907, second gate
It comprises an electrode 908. The driving circuit of the liquid crystal display device includes CM
An OS type thin film transistor (TFT) is used. A TFT made of such polycrystalline silicon is
High definition, high image quality and high aperture ratio
It is possible to obtain a liquid crystal display device that simultaneously achieves three items.
Was. [Comparative Example 1] Liquid crystal display device in this comparative example
FIG. 12B is a schematic view of the pixel portion of FIG. You can see from the figure
As described above, the adjacent Y-shaped pixel electrode 2 and common electrode 3
In this structure, the center lines overlap with each other via an insulating film. Ma
In addition, in this structure, because of the overlap, the step on the surface
Is big. The liquid crystal display device manufactured in this comparative example was
The size, resolution and pixel pitch are 1 as in the first embodiment.
4.1 inch, 141 ppi (UXGA equivalent), pixel pixel
Switch 180 micrometers (μm). In addition, liquid crystal
The assembly process of the display device is the same as that of the ninth embodiment. The liquid crystal display device assembled in this manner is
The display characteristics were evaluated. Liquid crystal table assembled in this comparative example
The display element has a high definition of 141 ppi,
As in Example 8, a high aperture ratio (達成 40%) was also achieved.
Here, the afterimage is particularly evaluated for comparison with the ninth embodiment.
Valued. Quantitative evaluation of image sticking and afterimage of liquid crystal display
Oscilloscope combined with photodiode to evaluate
It was evaluated using a scope. First, the window pattern with the maximum brightness is displayed on the screen.
Display for 30 minutes, after which the afterimage is most noticeable
Display screen so that the brightness is 10% of the maximum brightness
Switching the whole surface, the pattern at the edge of the window disappears
Time until the image is
The magnitude of the luminance variation of the luminance B between the afterimage part and the peripheral halftone part
The value ΔB / B (10%) was evaluated as the afterimage intensity. However
However, the allowable afterimage intensity is 3% or less. As described above, the liquid crystal display device of this comparative example is
As a result of evaluating the afterimage, the afterimage intensity was as large as 5%.
It takes about 30 minutes for the afterimage to disappear, and
Image afterimage inspection, clear image burn-in and
Display unevenness due to an afterimage was confirmed. The occurrence of this bad afterimage
Is the collection of the electric field due to the superposition of the pixel electrode and the common electrode.
Medium and large electrode steps formed.
You. According to the present invention, high definition (140 ppi)
Liquid crystal display that can simultaneously achieve high image quality and high aperture ratio
An apparatus can be provided. In addition, lower power consumption and
And increase the production efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram illustrating an electrode structure of a liquid crystal display device according to a first embodiment. FIG. 2 is a schematic diagram illustrating an electrode structure of a liquid crystal display device according to a second embodiment. FIG. 3 is a schematic diagram illustrating an electrode structure of a liquid crystal display device according to a third embodiment. FIG. 4 is a schematic diagram illustrating an electrode structure of a liquid crystal display device according to a fourth embodiment. FIG. 5 is a schematic diagram illustrating an electrode structure of a liquid crystal display device according to a fifth embodiment. FIG. 6 is a schematic diagram illustrating an electrode structure of a liquid crystal display device according to a sixth embodiment. FIG. 7 is a schematic diagram illustrating an electrode structure of a liquid crystal display device according to a seventh embodiment. FIG. 8 is a schematic diagram illustrating an electrode structure of a liquid crystal display device according to an eighth embodiment. FIG. 9 is a schematic diagram of a Y-shaped electrode structure for improving a reverse domain in the liquid crystal display device of Example 2. FIG. 10 is a schematic diagram of a Y-shaped electrode structure for improving a reverse domain in the liquid crystal display device of Example 3. FIG. 11 is a schematic diagram of a Y-shaped electrode structure for improving a reverse domain in the liquid crystal display device of Example 5. FIG. 12 is a schematic diagram illustrating an electrode structure of the liquid crystal display devices of Example 9 and Comparative Example 1. FIG. 13 is a schematic diagram illustrating an electrode structure of a pixel portion of a liquid crystal display device according to a tenth embodiment. FIG. 14 is a schematic cross-sectional view illustrating an example of the arrangement of signal lines and pixel electrodes of a liquid crystal display device. FIG. 15 is a schematic cross-sectional view of a liquid crystal display element according to the conventional FCA mounting and the mounting of the twelfth embodiment. FIG. 16 is an explanatory diagram of a positional relationship between a rubbing direction and a liquid crystal injection port in a liquid crystal display element. FIG. 17 is a diagram for explaining an equivalent circuit model when the liquid crystal display element is considered as a multilayer dielectric. FIG. 18 is a schematic explanatory view of a direction of an electric field generated in a pixel in a Y-shaped fishbone structure. FIG. 19 is an explanatory diagram of an arrangement of each electrode of the liquid crystal display element. FIG. 20 is an explanatory diagram showing an equivalent circuit of the entire liquid crystal display device in which a peripheral driving circuit of the liquid crystal display device and a TFT active matrix are integrated on the same substrate. FIG. 21 is an explanatory diagram illustrating a configuration of a drive system of a liquid crystal display device. FIG. 22 is a schematic cross-sectional view of a unit pixel of a TFT active matrix portion of a liquid crystal display device according to a thirteenth embodiment. FIG. 23 is a schematic exploded perspective view illustrating each component of the liquid crystal display device. [Description of Signs] 1,101,201,301,401,501,60
1,701,801,901,1001,1101 ... signal wiring, 2,102,202,302,402,50
2,602,702,802,902,1001,11
01 ... pixel electrode, 3,103,203,303,40
3,503,603,703,803,903,100
3, 1103 ... common electrode, 4, 104, 204, 30
4,404,504,604,704,804,90
4,1004,1104 ... scanning wiring, 5,105,20
5,305,405,505,605,705,80
5,905,1005,1105 ... Thin film transistor (TFT), 6,106,206,306,406,5
06,606,706,806,906,1006,1
106: second insulating film, 7, 107, 207, 307, 4
07,507,607,707,807,907,10
07, 1107: First insulating film, 8, 108, 208, 3
08, 408, 508, 608, 708, 808, 90
8, 1008, 1108 ... substrate, 309, 409, 10
09 ... contact hole (through hole), 310, 4
10, 1010... Common wiring, 611, 711, 111
1, a third insulating film (low-capacity insulating film), 12 drive IC,
13 Au bump, 14 Electrode pattern, 15 Anisotropic conductive film (ACF), 16 Stress buffer, 17 Rubbing direction, 18 Liquid crystal panel, 19 Liquid crystal inlet, 20 Liquid crystal, 21 Alignment Film, 22: overcoat film (color filter protective film), 23: color filter, 24: black matrix, 25: polarizing plate, 26: electric field, 27: scanning electrode drive circuit, 28: signal electrode drive circuit, 29: common Electrode drive circuit, 30 power supply circuit and control circuit,
DESCRIPTION OF SYMBOLS 31 ... Liquid crystal display element (liquid crystal display panel), 32 ... Shield case, 33 ... Diffusion plate, 34 ... Light guide plate, 35 ... Reflection plate, 36 ... Backlight, 37 ... Lower case, 38 ... Inverter circuit board, 39 ... Liquid crystal display device, 900: intrinsic semiconductor layer, 902: low-resistance n-type semiconductor layer, 903: high-resistance n-type semiconductor layer, 904: gate insulating film, 905: through-hole portion, 906: interlayer insulating film, 907: first 908, a second gate electrode, 951, a thin film transistor (TFT), 952, a pixel portion, 953, a vertical scanning circuit, 954, a horizontal scanning circuit, 954, a switch matrix circuit, 956, a scanning wiring, 957, a signal Wiring, 9
58: Source electrode, 960: Contact hole, 961
.., A pixel electrode, 968, a glass substrate, 969, a buffer layer, and 120, an upper planarization insulating film.

   ────────────────────────────────────────────────── ─── Continuation of front page    F-term (reference) 2H089 LA22 NA29                 2H092 GA14 GA20 GA43 HA03 HA04                       JB58 KA04 NA01 NA07

Claims (1)

  1. Claims: 1. A pair of substrates, at least one of which is transparent,
    Having a liquid crystal layer sandwiched between the pair of substrates, a plurality of scanning wirings on one of the substrates, a plurality of signal wirings formed in a matrix on the scanning wirings, the plurality of signal wirings and the plurality of A plurality of active elements formed corresponding to respective intersections with the scanning wiring, a plurality of pixel electrodes connected to the active elements, and a common wiring formed between each of the plurality of scanning wirings, A plurality of common electrodes connected to the plurality of common wirings, a voltage is applied between the pixel electrode and the common electrode, and the orientation of the liquid crystal is changed by a parallel electric field predominantly generated in the pair of substrates. In a liquid crystal display device that performs display by controlling, the pixel electrode and the common electrode are both formed in a V shape by a transparent conductive film, and the pixel is formed of a pixel surrounded by the scanning wiring and the signal wiring. In the longitudinal direction of The U-shaped pixel electrodes and the U-shaped common electrodes are alternately arranged so as to divide the pixel, and the pixel electrodes in the same pixel are at both ends of the pixel, and the common electrode is A liquid crystal display device characterized by being connected at both ends. 2. A pair of substrates at least one of which is transparent;
    A liquid crystal layer sandwiched between the pair of substrates, and one of the pair of substrates has a plurality of scanning wirings, a plurality of signal wirings formed in a matrix on the scanning wirings, and the plurality of signal wirings. A plurality of active elements formed corresponding to respective intersections with the plurality of scanning lines; a plurality of pixel electrodes connected to the active elements; and a common electrode formed between the plurality of scanning lines. A wiring, and a plurality of common electrodes connected to the plurality of common wirings, applying a voltage between the pixel electrode and the common electrode; In a liquid crystal display device that performs display by controlling the alignment, both the pixel electrode and the common electrode are made of a transparent conductive film, and
    The Y-shaped pixel electrodes and the Y-shaped common electrodes are alternately arranged so as to divide the pixel in the longitudinal direction of the pixel among the pixels formed in a character shape and surrounded by the scanning wiring and the signal wiring. And a pixel electrode in the same pixel is connected to both ends of the pixel, and a common electrode is connected to both ends of the pixel. 3. The Y-shaped pixel electrode and the Y-shaped common electrode are formed in different layers via an insulating film, and the Y-shaped pixel electrode and the Y-shaped common electrode center line are adjacent to each other. 3. The liquid crystal display device according to claim 2, wherein the liquid crystal display device does not have a region that overlaps in a direction perpendicular to the substrate on which the electrode group is formed. 4. The signal wiring, the scanning wiring, the common wiring, the common electrode, and the pixel electrode are formed between a liquid crystal layer and a glass substrate, wherein the common electrode is connected to the other electrode group and the glass substrate. 2. The wiring group and at least one insulating film formed on a different layer via at least one insulating film, and the common electrode is formed closest to the liquid crystal layer among the other electrode groups and the wiring group. 3. 3. The liquid crystal display device according to 2. 5. The liquid crystal display device according to claim 4, wherein a part of the common electrode is formed so as to overlap with the signal wiring via at least one insulating film. 6. A low-capacity insulating film for reducing a capacitive load is interposed between the common electrode and the signal wiring at least in a region where the common electrode and the signal wiring overlap. Item 6. A liquid crystal display device according to item 5. 7. A light-shielding black matrix extending in the scanning wiring extending direction is formed on a substrate facing the substrate on which the electrode group and the wiring group are formed, and the signal wiring 7. The liquid crystal display device according to claim 4, wherein no light-shielding black matrix is formed in the extending direction. 8. The liquid crystal display device according to claim 4, wherein a part of the common electrode is formed so as to overlap with the scanning wiring via at least one insulating film. 9. A low-capacity insulating film for reducing a capacitive load is interposed between the common electrode and the scanning line at least in a region where the common electrode and the scanning line overlap. Item 10. A liquid crystal display device according to item 8. 10. The liquid crystal display device according to claim 4, wherein a part of the common electrode is formed on at least one of the scanning wiring and the signal wiring at the same time via at least one insulating film. . 11. At least in an area where the common electrode and the signal wiring overlap, and in an area where the common electrode and the scanning wiring overlap, between the common electrode and the signal wiring, Between the common electrode and the scanning wiring,
    The liquid crystal display device according to claim 10, wherein a low capacitance insulating film for reducing a capacitance load is interposed. 12. The liquid crystal display device according to claim 8, wherein a light-shielding black matrix is not formed on a substrate facing the substrate on which the electrode group and the wiring group are formed. 13. The pixel electrode according to claim 4, wherein the pixel electrode is formed on a layer farthest from a layer on which the common electrode is formed.
    3. The liquid crystal display device according to any one of 2. 14. The liquid crystal display according to claim 1, wherein the arrangement structure of the common electrode and the pixel electrode is arranged in the pixel in a state where the intersection of the diagonal line of the pixel is inverted with respect to the center of symmetry. apparatus. 15. The common electrode and the common wiring are formed in different layers, at least one insulating film is interposed between the electrodes, and the common electrode and the common wiring are formed through contact holes formed in the insulating film. The liquid crystal display device according to claim 1, wherein is connected. 16. A flattening step for flattening a level difference generated in a step of forming the electrode group just below an alignment control film for aligning liquid crystal on the substrate side on which the electrode group is formed. The liquid crystal display device according to claim 1, wherein an insulating film is provided. 17. The semiconductor device according to claim 1, wherein at least one active element is formed in one pixel surrounded by the scanning wiring and the signal wiring, and the active element is formed of polycrystalline silicon. 16. The liquid crystal display device according to any one of items 15 to 15. 18. A driving IC for supplying a signal to the scanning wiring, the signal wiring, and the common wiring, the driving IC being an FCA
    17. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is mounted directly on the substrate constituting the liquid crystal display device by mounting. 19. A stress buffer for reducing stress and strain is provided between the drive IC and the substrate constituting the liquid crystal display device, in contact with the drive IC and the substrate. 3. The liquid crystal display device according to 1. 20. The thermal expansion coefficient of a material forming the driving IC and the thermal expansion coefficient of the substrate are substantially the same.
    9. The liquid crystal display device according to 8. 21. The liquid crystal display device according to claim 18, wherein the drive IC is mounted directly on the substrate using an ultraviolet-curable resin without being heated and pressed. 22. A heat insulating material or a heat absorbing material for preventing heat generated by the driving IC from being conducted to the substrate is provided between the driving IC and the substrate in contact with the driving IC. 3. The liquid crystal display device according to 1. 23. The liquid crystal display device according to claim 1, wherein the transparent conductive film is made of at least one of indium tin oxide (ITO), indium germanium oxide (IGO), and indium zinc oxide (IZO). . 24. A liquid crystal display device having a resolution of 140 ppi
    The liquid crystal display device according to any one of claims 1 to 23, which is as described above. 25. A liquid crystal display device comprising at least one sealing port for injecting liquid crystal into one of the sides of the substrate constituting the liquid crystal display device, the side being substantially perpendicular to the rubbing direction. 25. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is sealed with a sealing material for closing an entrance.
JP2001203418A 2001-07-04 2001-07-04 Liquid crystal display device Pending JP2003015146A (en)

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Cited By (9)

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EP1892561A2 (en) 2006-08-21 2008-02-27 Epson Imaging Devices Corporation Liquid crystal device using fringe fields and terminals for mounting components
US7339645B2 (en) 2003-12-11 2008-03-04 Lg.Philips Lcd. Co., Ltd. In-plane switching mode liquid crystal display device including field generating electrodes having a curved shape and method of fabricating the same
JP2008083395A (en) * 2006-09-27 2008-04-10 Casio Comput Co Ltd Liquid crystal display device
JP2008521064A (en) * 2004-11-23 2008-06-19 ファーガソン パテント プロパティーズ リミテッド ライアビリティ カンパニー Stereoscopic liquid crystal display (LCD) with polarization method
JP2008186006A (en) * 2007-01-29 2008-08-14 Boe Hydis Technology Co Ltd Fringe field switching (ffs) mode liquid crystal display and manufacturing method thereof
JP2008299325A (en) * 2007-06-01 2008-12-11 Toppoly Optoelectronics Corp Image display system
US7492428B2 (en) 2003-12-11 2009-02-17 Lg Display Co., Ltd. Thin film transistor array substrate and fabricating method thereof
US7719651B2 (en) 2004-05-22 2010-05-18 Lg Display Co., Ltd. In-plane switching liquid crystal display device
US10324347B1 (en) 2005-12-05 2019-06-18 Semiconductor Energy Laboratory Co., Ltd. Liquid crystal display device

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7339645B2 (en) 2003-12-11 2008-03-04 Lg.Philips Lcd. Co., Ltd. In-plane switching mode liquid crystal display device including field generating electrodes having a curved shape and method of fabricating the same
US7492428B2 (en) 2003-12-11 2009-02-17 Lg Display Co., Ltd. Thin film transistor array substrate and fabricating method thereof
US7719651B2 (en) 2004-05-22 2010-05-18 Lg Display Co., Ltd. In-plane switching liquid crystal display device
JP2008521064A (en) * 2004-11-23 2008-06-19 ファーガソン パテント プロパティーズ リミテッド ライアビリティ カンパニー Stereoscopic liquid crystal display (LCD) with polarization method
US10324347B1 (en) 2005-12-05 2019-06-18 Semiconductor Energy Laboratory Co., Ltd. Liquid crystal display device
EP1892561A2 (en) 2006-08-21 2008-02-27 Epson Imaging Devices Corporation Liquid crystal device using fringe fields and terminals for mounting components
US7671958B2 (en) 2006-08-21 2010-03-02 Epson Imaging Devices Corporation Liquid crystal device and electronic apparatus
EP1944645A2 (en) 2006-08-21 2008-07-16 Epson Imaging Devices Corporation Liquid crystal device using fringe fields and terminals for mounting components
JP2008083395A (en) * 2006-09-27 2008-04-10 Casio Comput Co Ltd Liquid crystal display device
JP2008186006A (en) * 2007-01-29 2008-08-14 Boe Hydis Technology Co Ltd Fringe field switching (ffs) mode liquid crystal display and manufacturing method thereof
JP2008299325A (en) * 2007-06-01 2008-12-11 Toppoly Optoelectronics Corp Image display system

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