JP3095955B2 - Liquid crystal display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device used for AV (Audio Vidual) equipment and OA (Office Automation) equipment.

[0002]

2. Description of the Related Art In recent years, home televisions used as AV equipment and display devices used for OA equipment have been reduced in weight.
There is a demand for thinner, lower power consumption, higher definition, and larger screens. For this reason, CRTs and liquid crystal displays (L
CD), plasma display (PDP), EL (ElectroLu)
minescent) Display device, LED (Light Emitting Display)
The development and commercialization of a large-screen display device such as a display device has been promoted.

[0003] Among them, the liquid crystal display device has the advantages that the thickness (depth) can be remarkably reduced, the power consumption is small, and the full color display is easy, compared with other display devices. It is being used in various fields, and there is great expectation for larger screens.

On the other hand, when the size of the screen of the liquid crystal display device is increased, a defective rate due to disconnection of a signal line, a pixel defect, or the like in a manufacturing process sharply increases, and further, the price of the liquid crystal display device increases. Such a problem arises. In order to solve this problem, a plurality of liquid crystal display devices are connected to form a single multi-display type liquid crystal display device as a whole, and the screen size is increased.

However, in the above-described multi-display type liquid crystal display device, in a display device in which liquid crystal panels are simply joined together, light from the backlight leaks from a gap formed at a connection portion between the respective liquid crystal panels, and the joints of the liquid crystal panels are leaked. Is noticeable.

Therefore, in order to obtain a natural large-screen image, it is necessary to make joints between display screens inconspicuous. Specifically, the following multi-display method has been proposed.

(Conventional example A) Japanese Patent Application Laid-Open Nos. 1-213621 and 5-127605 disclose a direct-view large-screen liquid crystal display device. As shown in FIG.
In the liquid crystal display device 101 disclosed in Japanese Patent Laid-Open No. 127605, a transparent electrode 103 is formed on a liquid crystal layer 102 of a polymer dispersion type.
, Color filter 104 and glass substrate 105
Is provided.

On the other hand, a thin film transistor (TFT) 106
A liquid crystal display element 114 is formed by forming a matrix array including a source electrode 107, a drain electrode 108, a gate electrode 109, amorphous silicon 110, and a gate insulating film 112 and a pixel electrode portion 111 on a glass substrate 113. Is provided.

Then, a plurality of liquid crystal display elements 114.
By arranging and connecting the pixel electrode portions 111 of the liquid crystal display elements 114 and the transparent electrodes 103 forming a pair with each other on the same plane on the glass reinforcing plate 115, The screen is being enlarged.

(Conventional Example B) As shown in FIG. 20, in a liquid crystal display device 120 disclosed in Japanese Utility Model Publication No. Hei 6-17178, a plurality of liquid crystal panels 121.
By providing the blind layers 122 covering the gaps of the seams formed in the reinforcing substrate 123 when joining them on the upper side, the seams between the liquid crystal panels 121 are concealed, and the screen size is increased while avoiding the deterioration of the display image quality. It is trying to make it.

(Conventional Example C) FIG. 21 shows a configuration example of a liquid crystal display device disclosed in JP-A-5-188340 and JP-A-5-341310. That is, in the liquid crystal display device 130, a plurality of transmissive liquid crystal panels 131 ...
Light sources 132 are provided as irradiation means on the back side of
Further, as an image enlarging unit or an image parallel moving unit, a refractive index distribution lens group 133.
4 and the screen 135 are the respective liquid crystal panels 131.
Are provided on the surface side which is the display surface side.

The respective refractive index distribution lens groups 133,..., Fresnel, so that the respective display images projected and formed on the screen 135 by the respective liquid crystal panels 131 are joined on the screen 135. The lenses 134 are adjusted. As a result, in each display image on the screen 135, a good display image with no noticeable seams can be obtained, and a large-screen rear-projection liquid crystal display device that avoids deterioration of display image quality is realized.

(Conventional Example D) FIG. 22 shows a configuration example of a liquid crystal display device disclosed in JP-A-5-19346 and JP-A-5-19347. That is, the liquid crystal display device 1
In 40, the projection lens 1 having the variable diaphragm 141
42, liquid crystal light valve 143, field lens 14
4, a projection type image display unit 147 composed of a concave reflecting mirror 145 and a light source lamp 146, and a screen 148 are used.

The plurality of projection image display units 147 are arranged such that projection images projected from the projection image display units 147 are arranged adjacent to each other on the screen 148 in the vertical and horizontal directions. As a result, a front-projection large-screen liquid crystal display device constituting one large screen is realized.

In the liquid crystal display device 140, the viewing angles of the upper and lower two-stage projection type image display units 147 are set to be vertically opposite to each other, and the light amount at the seam on the large screen is reduced. , Or by adjusting the uneven brightness of each of the projection image display units 147... To form an image with less noticeable seams.

However, the system of the conventional example C has the following problems. That is, it is basically a type of rear projection type display device (rear projector) that projects an image on the back of the screen, and it is necessary to use a screen that exhibits scattering and semi-transmission. Therefore, there is a problem that a decrease in contrast in a display image cannot be denied.

In addition, since a lens optical system such as an image enlarging unit and a parallel moving unit is used, light use efficiency is reduced, and a high-luminance irradiating unit is required. Therefore, there is a problem that power consumption increases.

Further, there is a problem that the cost is increased due to the presence of the lens optical system, and the thickness (depth) of the device is increased as compared with a direct-view type liquid crystal display device.

The method of the prior art D is the same as the screen 14
8 is a type of a front projection type display device (front projector) that projects an image on the front surface of the display device 8, and it is necessary to use a screen that exhibits scattering and reflection. Therefore, similarly to the method of the above-mentioned conventional example C, there is a problem that the reduction of contrast cannot be denied and a problem that power consumption increases due to the necessity of a high-brightness projection lamp.

On the other hand, the systems of the conventional examples A and B are liquid crystal display devices of a direct-view type. That is, a backlight such as a cold-cathode tube is placed behind the liquid crystal panel. Then, the liquid crystal panel modulates the light of the backlight in accordance with the image information, so that the observer can observe the image information input to the liquid crystal panel. Therefore, unlike a rear projection type or front projection type liquid crystal display device as in the above-mentioned conventional examples C and D, it is not necessary to use a screen showing scattering, translucency or reflection. Thereby, a decrease in contrast can be prevented.

Further, since a lens optical system such as an image enlarging means and a parallel moving means is not required, the light use efficiency is not reduced and a high-luminance irradiating means is not required. Thereby, an increase in power consumption can be prevented. Further, since a lens optical system is unnecessary, the cost can be reduced, and the increase in the thickness (depth) of the device can be suppressed.

[0022]

However, the conventional large-screen liquid crystal display devices using the multi-display system as shown in the above-mentioned conventional examples A and B have the following problems, respectively.

In the method of the conventional example A, the seam of the glass substrates 113 on which the TFTs 106 are formed is affected by the warpage of the glass substrates 113 and the variation of the glass thickness.
A step of 10 μm occurs. Therefore, the thickness of the liquid crystal layer 102 sealed in the liquid crystal panel varies.

In a twisted nematic (TN) liquid crystal display mode generally used in a TFT-LCD or the like, if the liquid crystal layer thickness has such a degree of variation, display is adversely affected and display quality is lowered.

For this reason, among the systems of the conventional example A, the system disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 5-127605 employs the polymer dispersion type liquid crystal display mode as described above, and this A method to avoid the adverse effects is proposed.

However, the direct-view polymer-dispersed liquid crystal display mode has low contrast in principle, that is, transmission / transmission.
While there is a problem that the contrast is deteriorated in order to perform display by switching the scattering, there is also a problem that the driving voltage is increased due to the presence of the polymer, and the power consumption is increased. Not be.

In the system of the prior art B, as described above, when connecting the plurality of liquid crystal panels 121, the blindfold layers 122 are provided on the reinforcing substrate 123 in order to prevent light leakage from the gap. However, since the glass substrates constituting the liquid crystal panels 121 have a thickness of usually 1.1 mm or 0.7 mm, when observing the liquid crystal display device 120 from an oblique direction, a liquid crystal layer for displaying an image and a blindfold layer 122. Parallax occurs according to the glass thickness. For this reason, there is a problem that the blind layers 122 are conspicuous from the oblique direction and the joints of the liquid crystal panels 121 are conspicuous.

It is an object of the present invention to provide a liquid crystal display device which solves these problems in the multi-display system and has excellent display image quality in which seams of display images by each liquid crystal panel are not conspicuous even on a large screen. And

[0029]

According to a first aspect of the present invention, there is provided a liquid crystal display device in which pixels for displaying an image by connecting and disconnecting transmitted light based on an image signal are arranged in a matrix. A plurality of liquid crystal panels, the pixels are formed between a transparent substrate having a light transmitting property and a substrate, and a reinforcing substrate supporting a plurality of liquid crystal panels is provided on one plane of the reinforcing substrate. Provided so that the display surface of the liquid crystal panel is flush, and a refractive index adjusting material having a refractive index substantially equal to that of the transparent substrate is provided so as to fill between the reinforcing substrate and each liquid crystal panel. If the thickness of the refractive index adjusting material between the substrate and the liquid crystal panel is made more uniform
They are almost equal to the above transparent substrate to keep them both constant.
A spacer having a high refractive index is mixed with the refractive index adjusting material.

[0030]

According to a second aspect of the present invention, in the liquid crystal display device, the image signal
Display images by connecting and disconnecting transmitted light based on
Liquid crystal panel having a large number of pixels in a matrix for
The above pixel is formed between a transparent substrate having light transmittance and the substrate.
Reinforcement substrate provided to support multiple liquid crystal panels
However, the display of each liquid crystal panel on one plane of the reinforcing substrate
Provided to be flush with the transparent substrate
The refractive index adjusting material having a new refractive index is
Provided to fill the space between the LCD panel and the reinforcing substrate
Spacer to keep the distance between the LCD and the LCD panel constant
Is mixed with the refractive index adjusting material, and the outer dimensions of the spacer for maintaining a constant distance between the reinforcing substrate and the liquid crystal panel are smaller than the roughness of the end faces of the liquid crystal panels facing each other. Is set as follows.

[0032]

According to a third aspect of the present invention, in the liquid crystal display device, the image signal
Display images by connecting and disconnecting transmitted light based on
Liquid crystal panel having a large number of pixels in a matrix for
The above pixel is formed between a transparent substrate having light transmittance and the substrate.
Reinforcement substrate provided to support multiple liquid crystal panels
However, the display of each liquid crystal panel on one plane of the reinforcing substrate
Provided to be flush with the transparent substrate
The refractive index adjusting material having a new refractive index is
Provided to fill the space between the LCD panel and the reinforcing substrate
Spacer to keep the distance between the LCD and the LCD panel constant
Is mixed with the refractive index adjusting material, and a light shielding layer that blocks light from a position different from a pixel in the liquid crystal panel,
It is provided so as to form a mesh between the transparent substrate and the substrate, and when the variation in each distance between the light shielding layer and the reinforcing substrate in each of the liquid crystal panels is y, and the width of the light shielding layer is x, -0.2 Each of the liquid crystal panels is supported by a reinforcing substrate so as to satisfy the expression x <y <0.2x. The liquid crystal display device according to claim 4 is a contractor.
4. The liquid crystal display according to claim 1, 2 or 3, wherein
The refractive index adjusting material fills the space between the liquid crystal panels.
It is characterized by being provided in.

[0034]

According to the structure of the first aspect of the present invention, the liquid crystal panel and the reinforcing substrate are filled with the refractive index adjusting material having substantially the same refractive index as that of the transparent substrate. Can be reduced.

That is, in general, a plurality of liquid crystal panels are provided.
When the display surfaces are joined so as to be flush with each other, if the end face of the transparent substrate at the junction of the liquid crystal panels is in contact with a medium having a different refractive index (for example, air), the refraction of light there is reduced. Occurs. In addition, when the end face is roughened during processing, that is, when the roughness becomes large, refraction and scattering of light occur at the end face. These cause the seams between the liquid crystal panels to stand out.

However, in the above configuration, as described above, the space between the liquid crystal panel and the reinforcing substrate is filled with the refractive index adjusting material having substantially the same refractive index as that of the transparent substrate. Refraction and scattering can be prevented.
Thus, in the above configuration, it is possible to obtain a natural image in which the seams of the liquid crystal panels are not noticeable.

In addition, by mixing the spacer with the refractive index adjusting material, each liquid crystal panel is pressed against the reinforcing substrate via the refractive index adjusting material and the spacer when each liquid crystal panel is supported on the reinforcing substrate. Then, the spacing between each of the liquid crystal panels and the reinforcing substrate can be maintained more constant by the spacer.

Accordingly, even if the refractive index of the refractive index adjusting material does not completely match the refractive index of the transparent substrate, the step between the liquid crystal panels adjacent to the reinforcing substrate is reduced. The joint between the liquid crystal panels can be made less noticeable.

[0039]

[0040] According to the arrangement according to claim 2, the dimensions of the outer shape of the spacer, because I set smaller than the roughness of the end face facing each other of the respective liquid crystal panels,
Even if the spacer is present in a joint serving as a joint portion between the liquid crystal panels, the spacer is fitted in the concave portion on the end face of the liquid crystal panel. Is avoided. Thereby, even if the spacer is mixed with the refractive index adjusting material, a state in which seams between the liquid crystal panels are inconspicuous can be maintained.

[0041]

According to the third aspect of the present invention , each of the liquid crystal panels is supported by the reinforcing substrate such that the position of the light-shielding layer satisfies the expression of -0.2x <y <0.2x. Even if the image from each liquid crystal panel is observed obliquely, the seam between the liquid crystal panels can be made inconspicuous.

[0043]

【Example】

[Embodiment 1] An embodiment of the present invention will be described below with reference to FIGS. In the liquid crystal display device according to the present embodiment, as shown in FIG.
There is provided a composite panel 1 having a plurality of liquid crystal panels 2 for displaying an image by connecting / disconnecting passing light based on an image signal and bonding them to each other such that the display surfaces of the liquid crystal panels 2 are flush with each other. ing.

As a result, in the liquid crystal display device, it is easy to manufacture the large-screen composite panel 1 by using a plurality of small liquid crystal display elements of about 10 inches which can be manufactured with high yield as the liquid crystal panel 2. And can be stabilized.

The composite panel 1 is a direct-view type liquid crystal display device having a large screen, and is manufactured as follows.
First, the active matrix type liquid crystal panels 2 are arranged on the same plane of one large substrate 3 (reinforcement substrate) so that the display surfaces of the respective liquid crystal panels 2 are flush with each other. On the (lower side in the figure) side, a backlight such as a cold cathode tube for supplying the transmitted light to each of the liquid crystal panels 2 is provided.

The driver for controlling the image signal and the above-mentioned backlight are omitted in the figure. The liquid crystal panel 2 modulates the light of the backlight in accordance with the image signal, that is, connects and disconnects, so that the observer can observe the image signal input to the liquid crystal panel 2 as a display image.

As shown in FIG. 3, the configuration of the liquid crystal panel 2 has a well-known active matrix type liquid crystal panel structure using active elements arranged in a matrix.

In the liquid crystal panel 2, a glass substrate (substrate) 11 and a glass substrate (transparent substrate) 11 as a counter substrate arranged in parallel with the glass substrate 10 at an interval for sealing the liquid crystal 7 are provided. Is provided. Each of the glass substrates 10 and 11 has light transmittance.

On the glass substrate 10, a pixel electrode 15
A large number of thin film transistors (TFTs) 16 for driving the pixel electrodes 15 are formed on a matrix, and a scanning signal line 14 for transmitting a control signal based on an image signal to each of the TFTs 16 and a data signal. A large number of lines 13 are formed like a ruled line of a go board crossing each other.

Therefore, on the glass substrate 10, the TFTs 1 are located at the intersections of the signal lines 13 and 14 so that the control signals from the signal lines 13 and 14 can be easily transmitted.
6 and each pixel electrode 15 are arranged.

The TFTs 16 are field-effect transistors using semiconductor thin films such as amorphous silicon (a-Si: H) and polycrystalline silicon (p-Si), and control the supply of image signals to the pixel electrodes 15. doing. The pixel electrode 15 is made of ITO when used as a transmissive display device.
(Indium Tin Oxide) or a reflective conductive film such as Al when used as a reflective display device.

A common electrode 12 for forming an electric field and a black matrix 5 for separating each pixel are formed on the glass substrate 11 so as to face the whole of the pixel electrodes 15. ing. When performing color display, R (red), G (green), and B (red) correspond to each pixel electrode.
(Blue) color filters 4 are formed. The black matrix 5 is provided on the glass substrate 11 on the display surface side.
Not only on the side but also on the glass substrate 10 side which is the back side.

The black matrix 5 includes the pixel electrode 1
5 are provided to block light from entering the gaps between the TFTs and the TFT area, and block light along the signal lines 13 and 14 and from positions different from the pixel electrodes 15. It is formed in a net-like shape.

When light passes through areas other than the pixel electrodes 15, there is a problem that the quality of the black display state is reduced and the contrast is reduced. In addition, TFT16
.. Incident on the TFT channel, a leakage current occurs due to light excitation, which causes a problem of deteriorating display image quality. Therefore, the black matrix 5 is provided to avoid the above problems.

In this embodiment, the black matrix 5 is formed of a light absorbing film made of a material that absorbs light and exhibits a black color. As a material of this light absorbing film,
Organic materials in which pigments and semiconductor fine particles such as carbon fine particles and titanium oxide fine particles are dispersed in a resin, or Group IV semiconductor materials such as silicon (Si), carbon (C), germanium (Ge), and tin (Sn) An inorganic material such as an amorphous thin film mainly composed of is used.

When the above-mentioned black organic material is used, it is not necessary to use a vacuum apparatus, and the organic material can be applied by printing or spin coating to form a light absorbing film. There is an advantage that can be formed.

In order to form an amorphous thin film using a group IV semiconductor material, a CVD (Chemical Vapor Deposi
Although it is necessary to use a vacuum device such as an option, there is an advantage that a black matrix 5 having a larger absorption coefficient than an organic material can be formed.

For example, a typical absorption coefficient of a black organic material in which carbon fine particles are dispersed in a resin is 10 ⁴ (cm)
^-1 ), whereas the absorption coefficient of an amorphous thin film (a-SiGe: H) using Si and Ge is 10 ⁵ (cm).
^-1 ). However, both are absorption coefficients for light having a wavelength of 650 nm.

The liquid crystal panel 2 is formed by laminating the glass substrates 10 and 11 via the sealing material 6 shown in FIG. 2 so that the pixel electrode 15 and the common electrode 12 face each other. This is performed by enclosing the liquid crystal 7 in the liquid crystal display.

Here, the sealing material 6 in the vicinity of the connection portion of the liquid crystal panel 2 must be arranged precisely in the vicinity of the pixel. However, when a thermosetting resin such as an epoxy resin is used for the sealing material 6, poor alignment of the liquid crystal occurs in a region of several hundred μm near the seal due to heat dripping of the sealing material 6 during thermosetting.

Therefore, in the liquid crystal display device according to the present embodiment, an ultraviolet-curable resin or a thermosetting and ultraviolet-curable resin is used as the sealing material 6. The ultraviolet-curable resin used here is, for example, an acrylic or epoxy resin that activates a polymerization initiator by irradiating ultraviolet rays to cure the resin. Thus, no heat droop occurs. Therefore, the sealing material 6 is located very close to the pixel.
Can be arranged.

FIGS. 4A and 4B show the liquid crystal panel 2 obtained in this way, as one large substrate 3 (not shown).
FIG. 4 is a layout diagram of the liquid crystal panels 2 when the liquid crystal panels 2 are arranged above. As shown in FIG. 1A, each liquid crystal panel 2 has one
The sides are cut along the cutting lines 17 and 17 near the end of the image display area, and the cut portions are stuck on the large substrate 3 so as to be joined.

As shown in FIG. 6B, the width b of the gap (connection portion) generated when the liquid crystal panels 2 are joined is determined by the line width a of the black matrix 5 required for one pixel.
It is connected so as to be smaller than. If the width b of the gap is too large compared to the line width a of the black matrix 5,
This is because the pixel pitch of the entire display screen collapses at the connection portion of the liquid crystal panels 2 to give an uncomfortable feeling to the observer. The pixel has an area approximately equal to that of the color filter 4.

Therefore, the division of the liquid crystal panel 2 requires a high degree of positional accuracy and finishing accuracy of the divided section. what if,
If the dividing lines 17 of the liquid crystal panel 2 are distorted or if there are irregularities of several hundred μm in the divided section of the liquid crystal panel 2, a larger gap is generated when the liquid crystal panels 2 are joined.

However, in a general method of dividing the liquid crystal panel 2 by scribing, it is not possible to avoid a distortion of a cross section of several hundred μm. A cutting method using a dicing device is suitable for obtaining high cutting position accuracy and cutting section finishing accuracy.

Therefore, in the present embodiment, the dividing position accuracy is set to 50 μm or less by the dividing method using the dicing device.
The cross-section finishing accuracy could be suppressed to 5 μm or less, and the seam of the liquid crystal panel 2 could be narrowed. Since the width b of the gap is equal to or less than the line width a of the black matrix 5, for example, 200 μm, the pixel pitch of the entire composite panel 1 can be made uniform.

Further, as shown in FIG.
Are joined with a refractive index adjusting material 9 at the connection portions of the liquid crystal panels 2. In this embodiment, a glass substrate having a refractive index of 1.53 (Corning 7059) is used for the glass substrates 10 and 11.
It is necessary to use a material having a refractive index of 1.53.

As such a material, for example, an ultraviolet curable type having an acrylic or ene / thiol double bond, which is irradiated with an ultraviolet ray so that the double bond is cleaved and the polymerization proceeds. It is preferable to use a resin whose refractive index after curing is adjusted to 1.53. The refractive index adjusting material 9 can also be used as an adhesive when the liquid crystal panel 2 is bonded to the large substrate 3. In addition, a refractive index adjusting liquid such as silicone oil having a refractive index of 1.53 can be used.

The liquid crystal panel 2 thus spliced
The composite panel 1 is formed by arranging the polarizing plates 8 and 8 on substantially the entire front and back surfaces respectively so that the polarization axes thereof are orthogonal to each other.

Here, in general, in a liquid crystal display device in which an active matrix type liquid crystal panel using TFTs is simply joined as a multi-display type liquid crystal display device, a gap formed at a connection portion of each liquid crystal panel is taken into consideration. Light from the backlight leaks, and the seams of the liquid crystal panel are conspicuous.

However, in the liquid crystal display device of this embodiment, the polarizing plates 8 are provided on almost the entire surface of the composite panel 1 formed by joining a plurality of liquid crystal panels 2. Are installed on the front and back of the composite panel 1 in a direction orthogonal to each other, as shown in FIG. 5, light leakage 18 from the connection portion of each liquid crystal panel 2 causes the polarizing plates 8.8 in a crossed Nicols state. Because there is, it is cut off.

As a result, when viewed from the observer A located substantially in front of the composite panel 1, the seams at the connection portions of the liquid crystal panels 2 are in the crossed Nicols state of the polarizing plates 8, and have a completely black state. Since it can be realized, the seams of the liquid crystal panels 2 can be made less noticeable.

When a metal light-shielding material such as chromium (Cr) or molybdenum (Mo) is used for the black matrix 5, the state of surface reflection by the black matrix 5 and the black state of the connection portion of each liquid crystal panel 2. The effect of making the seams inconspicuous is weakened by comparison with (the crossed Nicols state of the polarizing plates 8).

However, in the liquid crystal display device of this embodiment, since the light absorbing film made of a black material and absorbing light is used for the black matrix 5, the reflected light 19 from the black matrix 5 is absorbed by the light absorption. It takes on a black color.
That is, surface reflection on the black matrix 5 can be reduced.

As a result, both the leakage 18 of the backlight from the gap generated at the connection between the liquid crystal panels 2 and the reflected light 19 from the black matrix 5 are in a black state, and cannot be identified. Thereby, the seams of the liquid crystal panels 2 can be made less noticeable.

In general, when joining a plurality of liquid crystal panels, it is very difficult to join the plurality of liquid crystal panels without a step due to the influence of variations in the glass thickness of the liquid crystal panels and warpage. Further, when processing the liquid crystal panel, scratches such as pitching are generated on the edge of the liquid crystal panel. If there is such a step at the joint portion of the liquid crystal panel or a scratch at the edge of the liquid crystal panel, light is scattered there, which causes the joint to stand out.

However, in the liquid crystal display device of the present embodiment, as shown in FIG. 2, the composite panel 1 is provided by bonding a plurality of liquid crystal panels 2 on a single large-sized substrate 3. When a user observes an image from the large substrate 3 side, no step or flaw is exposed on the surface of the composite panel 1 due to the influence of the variation in the glass thickness of the liquid crystal panels 2 or the warpage. Thereby, in the composite panel 1, it is possible to obtain a natural image in which the seams are less noticeable.

The large-sized substrate 3 is a liquid crystal panel 2
When the composite panel 1 has a large area by joining a plurality of pieces, it also serves as a reinforcing plate, so that the impact resistance of the composite panel 1 can be increased. Thereby, in the composite panel 1, a natural image with less noticeable seams can be stably obtained over a long period of time.

Furthermore, as described above, since the thickness of the liquid crystal layer sealed in the liquid crystal panel 2 does not vary,
The display is not adversely affected by using the twisted nematic (TN) liquid crystal display mode. Thereby, it is possible to prevent a decrease in display quality in such a display mode.

At the same time, in the configuration of the above embodiment, there is no need to use the direct-view type polymer dispersed liquid crystal display mode, so that the contrast does not decrease. Further, since the driving voltage can be kept low, an increase in power consumption can be suppressed.

As described above, when the black matrix 5 is formed using a group IV semiconductor material, the absorption coefficient of the black matrix 5 can be further increased as compared with the case where the black matrix 5 is formed using an organic material. Therefore,
The surface reflection of the black matrix 5 can be reduced more effectively. This makes it possible to make the joints between the liquid crystal panels 2 less noticeable.

Further, as described above, in the composite panel 1, since the ultraviolet curable resin or the thermosetting ultraviolet curable resin is used as the seal material 6, no heat dripping occurs and the pixel is extremely close to the pixel. It is possible to dispose the sealing material 6 on the surface. This makes it possible to obtain a natural image with less noticeable seams.

As described above, since the width b of the gap between the liquid crystal panels 2 is smaller than the line width a of the black matrix 5 (see FIG. 4), the pixel pitch of the entire composite panel 1 is made uniform. be able to. This makes it possible to obtain a natural image in which the seams are less noticeable.

As described above, the connection portions of the liquid crystal panels 2 are filled with the refractive index adjusting material 9 having substantially the same refractive index as the glass substrate 10 and the glass substrate 11 constituting the liquid crystal panel 2. Therefore, light is prevented from being refracted and scattered due to unevenness of the end face of the substrate at the connection portion between the liquid crystal panels 2. This makes it possible to obtain a natural image with less noticeable seams.

As described above, the refractive index adjusting material 9 is
It can also be used as an adhesive when the liquid crystal panel 2 is bonded to the large substrate 3. In this case, if light is reflected at the interface between the large substrate 3 and the glass substrate 11, the display contrast is reduced. Therefore, it is preferable to use a resin having the same refractive index as the glass substrate 11 and the large-sized substrate 3. This makes it possible to obtain a natural image with less noticeable seams.

As described above, in this embodiment, an active matrix type liquid crystal panel using TFTs 16 is used as the liquid crystal panel 2. However, as the active matrix type liquid crystal panel, a diode (MI
M, Metal Insulator Metal) is also effective. Further, the present invention is also effective for a liquid crystal panel of a duty drive type as a liquid crystal panel other than the active matrix type.
However, it is desirable to use an active-matrix liquid crystal panel because crosstalk between pixels is small and an image with higher display quality can be obtained.

Embodiment 2 Another embodiment of the present invention will be described as Embodiment 2 with reference to FIGS. 2 and 6. For the sake of convenience of explanation, members having the same functions as those shown in the drawings of the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 6, in the liquid crystal display device of this embodiment, two joined liquid crystal panels 2 are composed of two large substrates, that is, a large substrate 3 (substrate) and a large substrate 21.
A composite panel 20 sandwiched between (a substrate) is provided. The liquid crystal panels 2 used have the same structure as that used in the first embodiment. Note that a driver for controlling an image signal and a backlight are omitted in the drawing.

The composite panel 20 is the composite panel 1 of the first embodiment.
Is different from the liquid crystal panel 2 on the same plane of the large substrate 3.
After that, the large substrate 21 is further pasted on the liquid crystal panel 2. In order to attach the large-sized substrate 21, it is preferable to use the refractive index adjusting material 9 used when joining the liquid crystal panels 2.

The composite panel 1 according to the first embodiment (FIG. 2)
), When the plurality of liquid crystal panels 2 are pasted on the same plane of the large substrate 3 with the resin as the refractive index adjusting material 9, the resin protrudes from the connection portion of the liquid crystal panel 2 onto the glass substrate 10. Steps and irregularities are formed.

The steps and irregularities are light scattering elements, and the light passing therethrough is scattered to change the polarization state. Therefore, the black state of the polarizing plates 8.8 due to crossed Nicols cannot be maintained. Therefore, it is necessary to remove the protruding resin.

However, in the composite panel 20 according to the present embodiment, as shown in FIG. 6, the large substrate 21 is provided on the back surface (backlight side) of the composite panel 20, that is, on the glass substrate 10 side. The resin does not protrude from the connection portion 2. Therefore, the liquid crystal panel 2
The light scattering elements such as steps and irregularities between the resin surface of the connection portion of... And the surface of the liquid crystal panel 2 on the glass substrate 10 side can be eliminated.

Therefore, the scattering of the light passing through the connecting portions of the liquid crystal panels 2 can be suppressed, and the change in the polarization state can be prevented, so that the connecting portions look black due to the crossed Nicols of the polarizing plates 8. The state can be kept good. Thereby, compared to the composite panel 1 according to the first embodiment, a more natural image display with less noticeable seams can be easily obtained.

Further, the joined liquid crystal panels 2.
Since the composite panel 20 is sandwiched between the large substrates 3 and 21, the strength of the composite panel 20 can be further increased. In particular, when the composite panel 20 is a large screen display device having a size of 20 inches or more, the handling thereof can be remarkably facilitated.

Further, the exposure of the liquid crystal panel 2 on the rear surface (backlight side) of the composite panel 20 due to the unevenness of the glass thickness or the influence of the warp or the like and the damage such as the pitching of the edge of the liquid crystal panel 2. , Can be prevented by the large-sized substrate 21.

Therefore, the scattering of light passing through the connecting portions of the liquid crystal panels 2 is further suppressed, and the change of the polarization state is further prevented. Can be kept good. This makes it easier to obtain a more natural image display with less noticeable seams.

Third Embodiment A third embodiment of the present invention will be described below with reference to FIGS. 7 to 10 as a third embodiment. For the sake of convenience, members having the same functions as those shown in the drawings of the above-described embodiment will be denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 7, in the liquid crystal display device according to the present embodiment, in addition to the composite panel 1 of the first embodiment, a black matrix is provided at a connection portion of the liquid crystal panels 2 (end face of the glass substrate 11). LCD panel 2 perpendicular to 5
Are provided with a second light-shielding film 31 extending in the surface direction of the composite panel 30.

The second light-shielding films 31 may be made of a black resin in which a pigment or semiconductor fine particles (for example, carbon fine particles or titanium oxide fine particles) are dispersed in a resin.

As described above, in the composite panel 1 and the composite panel 20 shown in the first and second embodiments, the backlight light leaked from the gap generated at the connection portion of the liquid crystal panels 2 is transmitted to the polarizing plate 8. (8) The connection portion is cut off in the direct Nicol state, and the connection portion looks black. Therefore, the black of the black matrix 5 cannot be distinguished from the blackness of the connection portion. Thereby, the seams of the liquid crystal panels 2 are less noticeable. Composite panel 1 and composite panel 20
Has such a feature.

The above-described features are the same in the composite panel 30 of the liquid crystal display according to the third embodiment. That is, as shown in FIG. 8, when viewed from an observer A located substantially in front of the composite panel 30, the joints of the connection portions of the liquid crystal panels 2 are completely black in the crossed Nicols state of the polarizing plates 8.8. Since the state can be realized (indicated by a circle in the figure), the seams of the liquid crystal panels 2 are inconspicuous.

However, a polarizing plate generally has a viewing angle characteristic. That is, for light that is obliquely incident on the polarizing plate, perfect black cannot be realized even in the crossed Nicols state. As shown in FIG. 10, in the composite panel 1 of the first embodiment, when viewed from an observer A located substantially in front of the composite panel 1, the crossed Nicols state of the polarizing plates 8, 8 causes the liquid crystal panels 2. A completely black state of the connection part can be realized (indicated by a circle in the figure), and the seams of the liquid crystal panels 2 are not noticeable. However, from the observer B located in the oblique direction of the composite panel 1, the leakage of the backlight light occurs at the connection portion of the liquid crystal panels 2 depending on the viewing angle characteristics of the polarizing plates 8.8 (x in the figure). ), Resulting in a slightly more noticeable seam.

On the other hand, in the liquid crystal display device according to the present embodiment, as shown in FIG. 8, even when viewed from the observer B located in the oblique direction of the composite panel 30, the connection of the liquid crystal panels 2. Since the leaked light generated in the portion is shielded by the second light-shielding film 31, it is possible to realize a state in which the connection portion looks completely black as in the case of the observer A (in FIG. ), The joints of the liquid crystal panels 2 can be made inconspicuous. That is, the liquid crystal display device according to the present embodiment can make the seams of the liquid crystal panels 2 inconspicuous in a wide viewing angle range regardless of the viewing angle of the observer.

Here, as shown in FIG. 9, when the line width at the end of the glass substrate 11 of the black matrix 5 is c and the width of the second light-shielding film 31 is d, if c 角 d, the viewing angle is Is within ± 45 degrees, color filter 4
Is not blocked by the second light shielding film 31.

However, if c <d, the angle at which the image display light passing through the color filter 4 is blocked by the second light-shielding film 31 is increased, and the viewing angle of the liquid crystal display device 30 is reduced. Therefore, the liquid crystal display device 30
In order to prevent the viewing angle from being narrowed, it is necessary to satisfy c ≒ d or c> d when designing the second light shielding film 31.

The formation position and the shape of the second light-shielding film 31 are not limited to those shown in FIGS. 6 to 8, and the observation position of the composite panel 30 in the oblique direction is not reduced without reducing the viewing angle of the composite panel 30. LCD panel 2
.. May be shielded from light leaking from the connecting portions.

Fourth Embodiment A fourth embodiment of the present invention will be described below with reference to FIGS. 11 and 12. For the sake of convenience of explanation, members having the same functions as those shown in the drawings of the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As described above, the liquid crystal display devices shown in Embodiments 1 to 3 use a film formed of a black organic material or an inorganic material for the black matrix 5 and reflect light from the black matrix 5. , Makes the seams of the liquid crystal panels 2... Less noticeable.

As described above, the black matrix 5 using an organic material or an inorganic material has a lower light-shielding property than a black matrix using a metal film. Is required to be 1 μm or more. However, if the thickness is 1 μm or more, there is a possibility that the uniformity of the cell gap of the liquid crystal panels 2 is adversely affected.

On the other hand, in the liquid crystal display device according to this embodiment, as shown in FIG. 11, the light absorbing film 41 and the metal film 42 are laminated to form the black matrix 5.
(First light-shielding film). Note that chromium (Cr), aluminum (Al), or the like can be used for the metal film 42.

Due to the excellent light-shielding properties of the metal film 42,
The light shielding properties of the black matrix 5 can be improved while the thickness of the black matrix 5 is suppressed to 0.5 μm or less. Therefore, the uniformity of the cell gap of the liquid crystal panels 2 can be improved.

As shown in FIG. 12, similarly to the composite panel 20 of the second embodiment, a composite panel 45 having two large substrates 3 and 21 and employing the black matrix 5 can be provided. Also in this case, the uniformity of the cell gap of the liquid crystal panels 2 can be improved as described above.

In this embodiment, the black matrix 5 formed by the light absorbing film 41 and the metal film 42 is provided on the glass substrate 11 side, but the black matrix 5 may be provided on the glass substrate 10 side. Instead of the black matrix 5, only the metal film 42 is
A structure in which only the light absorbing film 41 is provided on the glass substrate 11 side may be provided on the 0 side.

Fifth Embodiment Still another embodiment of the present invention will be described as a fifth embodiment with reference to FIG. For the sake of convenience of explanation, members having the same functions as those shown in the drawings of the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the first to fourth embodiments, one or two substrates (large substrates 3 and 21) are used as reinforcing substrates when joining a plurality of liquid crystal panels 2. The liquid crystal display device of the present invention is not limited to the configuration in which these are provided, and may have a configuration in which these reinforcing substrates are omitted.

That is, as shown in FIG. 13, in the liquid crystal display device of the present embodiment, the liquid crystal panels 2 are joined together without using a reinforcing substrate, and the thickness of each of the joined liquid crystal panels 2. A pair of polarizing plates 8.8
Are attached so that their polarization axes are orthogonal to each other, and a composite panel 50 is provided.

When an acrylic plate having a thickness of about 1 to 2 mm is used as the polarizing plate 8.8,
Since the polarizing plates 8.8 serve as reinforcing plates in the composite panel 50, the strength of the composite panel 50 can be maintained. Thereby, the impact resistance of the composite panel 50 can be improved, and a natural image with no noticeable seams of the liquid crystal panels 2 can be stably obtained over a long period of time.

[Embodiment 6] A still further embodiment of the present invention will be described as a sixth embodiment with reference to FIGS. 1 and 14 to 18 as follows. For convenience of explanation, members having the same functions as the members shown in the drawings of the above-described embodiments are denoted by the same reference numerals, and description thereof will be omitted.

In the composite panel in each of the above embodiments, when a plurality of liquid crystal panels 2 are bonded to the large-sized substrate 3 by using a refractive index adjusting material (for example, an ultraviolet curing resin) 9, the glass substrate 11 of the liquid crystal panel 2 Refractive index and refractive index adjusting material 9
Index adjusting material 9 so that the refractive index of
By setting the refractive index of each of the liquid crystal panels 2.
The seams between them are less noticeable.

However, the composite panel has the following problems. Usually, the glass substrates 11 and 10 used for the liquid crystal panel 2 are said to have considerable flatness, but have a thickness unevenness of up to about 30 μm.

Therefore, as shown in FIG. 14, when the liquid crystal panels 2 using different glass substrates 10 and the like are joined to each other, there is a possibility that a maximum step of about 30 μm may occur between the liquid crystal panels 2. There is. Further, even when the thickness of the glass substrates 10 and 11 of the liquid crystal panel 2 is very small, if the thickness of the refractive index adjusting material 9 is uneven, a step is generated at the joint of the liquid crystal panels 2. .

Even if such a step occurs, the refractive index adjusting material 9 filled between the joining surfaces of the liquid crystal panels 2.
Is, in principle, the same as each of the glass substrates 10 and 11 of the liquid crystal panel 2 and the same refractive index in the entire visible light region.
The step 11 has no effect optically, and the joint at the joint should not be identified.

However, since it is actually very difficult to find the refractive index adjusting material 9 satisfying the above-mentioned perfect conditions, the following mechanism causes a problem that the joint at the joining portion is slightly noticeable. .

(1) The refraction angles of the light transmitted through the step formed at the junction are different (see FIG. 15).

(2) The transmitted light is scattered by the step formed at the junction, and the polarization of the light transmitted through the junction is eliminated.

The liquid crystal panels 2 shown in FIG.
Are different between the left and right liquid crystal panels 2, the images displayed on the respective liquid crystal panels 2 are unnatural, giving the viewer a sense of discomfort.

Therefore, in the liquid crystal display device of the present embodiment, as shown in FIG. 1, the spacer 61 is used as the refractive index adjusting material 9 for the composite panel 20 of the second embodiment.
And the composite panel 60 is provided.

First, a method of manufacturing the composite panel 60 will be described.
A 1.54 refractive index adjusting material 9 mixed with a spacer 61 made of plastic beads having a refractive index of 1.54 and a particle diameter of 10 μm is filled.

Next, the plurality of liquid crystal panels 2 are aligned so that their display surfaces are flush with each other, and the respective liquid crystal panels 2 are temporarily fixed to the large substrate 3. After that, the liquid crystal panels 2 are pressed with a predetermined load in the thickness direction of the liquid crystal panels 2, and an extra refractive index adjusting material 9 is removed from between the liquid crystal panels 2 and the large substrate 3. Extrude.

At this time, the used refractive index adjusting material 9 and spacer 61 are used for the glass substrate 1 used for the liquid crystal panel 2.
The refractive index of the glass substrate 1 is adjusted so as to be substantially the same as that of the glass substrate 1.
The difference in the refractive index of 1 is 0 at the D line (wavelength: about 590 nm).
03 or less, more preferably 0.03 or less in the visible light region (400 nm to 700 nm).

As a result, the refractive index adjusting member 9 having a more uniform thickness can be obtained by the spacer 61.
The occurrence of steps on the glass substrate 11 in each of the liquid crystal panels 2 can be prevented. Therefore, the refraction angles of the light transmitted through the liquid crystal panels 2 are all equal, and the scattering of the light can also be avoided. A display device can be obtained.

Further, the reinforcing plate 21 may be used on the backlight side. In the sixth embodiment, an example is described in which an ultraviolet curable resin is used as the material of the refractive index adjusting material 9 to be filled. However, if the refractive index satisfies the above-described conditions, the thermosetting resin may be used. Also, an epoxy-based adhesive or the like can be used.

Further, although an example using plastic beads as the spacer 61 has been described, silica beads or the like can be used as long as the above conditions are satisfied. However, since the plastic beads have higher elasticity than the silica beads, the variation in the thickness of the glass substrate 11 or the large substrate 3 can be more absorbed, and the step generated between the glass substrates 11 can be reduced by the spacer 61. An excellent effect can be exhibited in that it can be suppressed.

In the sixth embodiment, since the steps of the liquid crystal panels 2 are eliminated on the glass substrate 11 side constituting the liquid crystal panel 2, each of the glass substrates 1 on the backlight side is eliminated.
There is a possibility that a level difference may occur on the 0... Side. However, if a level difference occurs on each of the glass substrates 10..., This application does not adversely affect the visibility of the liquid crystal panels 2. inventors have experimentally confirmed. Therefore, it is not necessary to consider the steps generated on the glass substrates 10... As much as the steps generated on the glass substrates 11.

When a load is applied to each of the liquid crystal panels 2 to push out the excess refractive index adjusting material 9, if the area of each of the liquid crystal panels 2 becomes large, it is necessary to apply a very large pressure. In order to perform this under a small pressure, if the viscosity of the refractive index adjusting material 9 is small, and if the particle diameter of the mixed spacer 61 is large, the refractive index adjusting material 9 can be easily extruded even with a small load. .

Therefore, the viscosity of the refractive index adjusting material 9 is preferably 3000 cp or less as a result of producing the composite panel 60 using the refractive index adjusting materials adjusted to various viscosities. The larger the particle size of the spacer 61 is, the more preferable it is. However, the larger the gap 62 between the bonding surfaces 2a of the liquid crystal panels 2 is, the more inappropriate it is. Therefore, the undulation of the bonding surface 2a, that is, the roughness It is desirable to set the size to be equal to or smaller than the size.

As described above, in the sixth embodiment, the method of reducing the step when joining the plurality of liquid crystal panels 2... Has been described. Next, the allowable range of the step will be described.

FIG. 16 is an enlarged view of a joint portion (joined portion) of each liquid crystal panel 2. In any case where the width x of the black matrix 5 shown in the drawing changes by about 20% with respect to the width of the black matrix 5 in other places, the observer can use each liquid crystal panel 2 at that point. The present inventors have experimentally verified that the displayed image has a strange feeling.

Therefore, when the general viewing angle range of the composite panel 60 is ± 45 degrees, each of the liquid crystal panels 2.
It is sufficient that the visible width of the black matrix 5 at the joint portion of the above is within a range of about 20% increase or decrease between when there is a step and when there is no step.

FIG. 17 (a) shows that, when there is no step in the black matrix 5 at the joint portion of each liquid crystal panel 2,..., Ie, 45 degrees with respect to the normal line on the display surface of each liquid crystal panel 2. FIG. 7 is a diagram geometrically showing a width x ′ of a black matrix that is actually felt by an observer viewed from a direction.
It can be seen from the figure that x ′ = x / (2 ^1/2 ).

On the other hand, FIG. 17B shows each liquid crystal panel 2.
FIG. 7B is a diagram geometrically showing a width x ″ of the black matrix that the observer actually feels when viewed from a 45-degree oblique direction when there is a step y in the black matrix at the joint portion of FIG.
From the figure, it can be seen that x ″ = (x + y) / (2 ^1/2 ).

If the relationship between x ′ and x ″ increases or decreases by about 20%, the observer does not have a sense of discomfort in the image.

[0143]

(Equation 1)

Since (Equation 1), -0.2 x <
y <0.2 x (Equation 2).

By setting the displacement in the thickness direction of each liquid crystal panel 2 within a range satisfying such a condition (Equation 2), it is possible to stably produce a liquid crystal display device having excellent display image quality.

As described above, according to the configuration and method of the sixth embodiment, the refractive index adjusting material 9 mixed with the spacer 61 is filled between the glass substrate 11 and the large substrate 3 of the liquid crystal panel 2.
Further, since there is a manufacturing process for removing the extra refractive index adjusting material 9 by applying a load, it is possible to prevent a step from being formed in each glass substrate 11 at a joint portion between the liquid crystal panels 2.

As a result, as shown in FIG. 18, since the refraction angles of the transmitted light are all equal and the scattering of the light is prevented, a liquid crystal display device having good display quality with no noticeable seams is manufactured. Can be stabilized.

Further, by setting the particle size of the spacer 61 to be smaller than the undulation generated on the bonding surface 2a of the liquid crystal panel 2, that is, the maximum value of the roughness,
Since the space between the liquid crystal panels 2 is prevented from being increased by the spacer 61, the spacer 61
The deterioration of the display image quality in the composite panel 60 is prevented by adding.

As described above, in the configuration of the sixth embodiment, when a plurality of liquid crystal panels 2 are joined to each other to form a composite panel 60, the seams of the liquid crystal panels 2 can be made inconspicuous, so that multi-display is possible. In a direct-view type liquid crystal display device having a large screen according to the method, it is possible to further improve the display image quality.

Further, according to the manufacturing method of the sixth embodiment, a direct-view type liquid crystal display device having a large screen by a multi-display system with further improved display image quality can be stably manufactured, and the size of the liquid crystal display device can be increased. Can be manufactured with higher yield.

[0151]

As described above, in the liquid crystal display device according to the first aspect of the present invention, the reinforcing substrate supporting a plurality of liquid crystal panels having a transparent substrate is provided on one plane of the reinforcing substrate. Provided so that the display surface is flush, a refractive index adjusting material having a refractive index substantially equal to the transparent substrate,
Between the reinforcing substrate and each liquid crystal panel , and each of the liquid crystals
It is provided so as to fill the space between the panels, and if the thickness of the refractive index adjusting material between the reinforcing substrate and the liquid crystal panel is made more uniform,
Further, a spacer for maintaining a constant is mixed with the refractive index adjusting material, and the spacer is substantially
This is a configuration having the same refractive index .

Therefore, in the above configuration, the spacer is mixed with the refractive index adjusting material, so that when each liquid crystal panel is supported by the reinforcing substrate, each liquid crystal panel is supported by the reinforcing substrate via the refractive index adjusting material and the spacer. , The distance between each of the liquid crystal panels and the reinforcing substrate can be maintained more constant by the spacer.

Therefore, in the above configuration, even if the refractive index of the refractive index adjusting material and the refractive index of the transparent substrate do not completely match, the step between the liquid crystal panels adjacent to the reinforcing substrate is reduced. This makes it possible to make the seams between the liquid crystal panels less noticeable, so that an excellent display image quality can be realized on a large screen.

[0154]

[0155]

A liquid crystal display device according to a second aspect of the present invention is
Reinforcing substrate supporting multiple liquid crystal panels with transparent substrate
However, the display of each liquid crystal panel on one plane of the reinforcing substrate
Provided to be flush with the transparent substrate
The refractive index adjusting material having a new refractive index is
Provided to fill the space between the LCD panel and the reinforcing substrate
Spacer to keep the distance between the LCD and the LCD panel constant
Is mixed with the refractive index adjusting material, and the outer dimensions of the spacer for maintaining a constant distance between the reinforcing substrate and the liquid crystal panel are smaller than the roughness of the end faces of the liquid crystal panels facing each other. The configuration is set as follows.

Therefore, in the above configuration, since the dimensions of the outer shape of the spacer are set as described above, even if the spacer is present in the joint which is the joint portion of each of the liquid crystal panels, the spacer is formed of the liquid crystal. Since the liquid crystal panel is accommodated in the concave portion on the end face of the panel, it is possible to prevent the space between the liquid crystal panels from being increased by the spacer.

Thus, in the above-described configuration, even when the spacer is mixed with the refractive index adjusting material, a state in which the seams between the liquid crystal panels are inconspicuous can be maintained, so that excellent display image quality can be realized on a large screen. This has the effect.

[0159]

[0160]

A liquid crystal display device according to a third aspect of the present invention comprises:
Reinforcing substrate supporting multiple liquid crystal panels with transparent substrate
However, the display of each liquid crystal panel on one plane of the reinforcing substrate
Provided to be flush with the transparent substrate
The refractive index adjusting material having a new refractive index is
Provided to fill the space between the LCD panel and the reinforcing substrate
Spacer to keep the distance between the LCD and the LCD panel constant
Is mixed with the refractive index adjusting material, and a light shielding layer that blocks light from a position different from a pixel in the liquid crystal panel,
It is provided so as to form a mesh between the transparent substrate and the substrate, and when the variation in each distance between the light shielding layer and the reinforcing substrate in each of the liquid crystal panels is y, and the width of the light shielding layer is x, -0.2 Each of the liquid crystal panels is supported on a reinforcing substrate so as to satisfy the expression x <y <0.2x.

Therefore, in the above configuration, the position of the light shielding layer is-
Since each of the liquid crystal panels is supported by the reinforcing substrate so as to satisfy the equation of 0.2x <y <0.2x, even if the image from each of the liquid crystal panels is obliquely observed, the liquid crystal panels between Since the seams can be made inconspicuous, there is an effect that excellent display image quality can be realized on a large screen.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a composite panel according to a sixth embodiment of the liquid crystal display device of the present invention.

FIG. 2 is a schematic configuration diagram of a composite panel according to a first embodiment of the liquid crystal display device of the present invention.

FIG. 3 is a perspective view showing the internal structure of the liquid crystal panel of the composite panel.

4A and 4B are explanatory views showing a process of forming the composite panel, wherein FIG. 4A is a plan view before two liquid crystal panels are bonded, and FIG. It is a top view after.

FIG. 5 is an explanatory diagram showing a difference in visibility between a seam and a black matrix in the composite panel.

FIG. 6 is a schematic configuration diagram of a composite panel according to a second embodiment of the liquid crystal display device of the present invention.

FIG. 7 is a schematic configuration diagram of a composite panel according to a third embodiment of the liquid crystal display device of the present invention.

FIG. 8 is an explanatory diagram showing that a difference in visibility due to parallax at a joint of the composite panel is corrected.

FIG. 9 is an enlarged sectional view of a main part of the composite panel.

FIG. 10 is an explanatory diagram showing a difference in visibility of a seam due to parallax in the composite panel of FIG. 2;

FIG. 11 is a schematic configuration diagram of a composite panel according to a fourth embodiment of the liquid crystal display device of the present invention.

FIG. 12 is a schematic configuration diagram showing a modified example of the composite panel.

FIG. 13 is a schematic configuration diagram showing another modified example of the composite panel.

14 is a schematic configuration diagram of a composite panel as a comparative example with respect to the composite panel in FIG.

FIG. 15 is an enlarged configuration diagram of a main part of a composite panel as a comparative example with respect to the composite panel in FIG. 1;

16 is a main part configuration diagram showing an allowable range of a position error of each liquid crystal panel in the composite panel in FIG. 1;

17A and 17B are explanatory diagrams showing an allowable range of a position error of each of the liquid crystal panels, wherein FIG. 17A shows a case where the position error does not occur, and FIG. 17B shows a case where the position error occurs. FIG.

FIG. 18 is a main part configuration diagram of the composite panel when there is no step in each liquid crystal panel.

FIG. 19 is a sectional view of a main part of a conventional liquid crystal display device.

FIG. 20 is a sectional view of a main part of another conventional liquid crystal display device.

FIG. 21 is a sectional view of a main part of still another conventional liquid crystal display device.

FIG. 22 is a sectional view of a main part of still another conventional liquid crystal display device.

[Explanation of symbols]

 2 liquid crystal panel 3 large substrate (reinforcement substrate) 9 refractive index adjusting material 10 glass substrate (substrate) 11 glass substrate (transparent substrate) 61 spacer

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-241317 (JP, A) JP-A-5-289110 (JP, A) JP-A-4-3089 (JP, A) JP-A-60-1985 75818 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G02F 1/1333 G02F 1/13 101 G02F 1/1339 G09F 9/00-9/46

Claims (4)

(57) [Claims] A liquid crystal panel having a large number of pixels for displaying an image in a matrix by connecting and disconnecting transmitted light based on an image signal, comprising: A reinforcing substrate for supporting the plurality of liquid crystal panels is provided on one plane of the reinforcing substrate so that the display surfaces of the liquid crystal panels are flush with each other, and has a refractive index substantially equal to that of the transparent substrate. Is provided so as to fill between the reinforcing substrate and each of the liquid crystal panels, and the thickness of the refractive index adjusting material between the reinforcing substrate and the liquid crystal panel is reduced.
A liquid crystal display device, characterized in that a spacer for making the film uniform and constant is mixed with the refractive index adjusting material, and the spacer has a refractive index substantially equal to that of the transparent substrate . 2. A liquid crystal panel having a large number of pixels for displaying an image in a matrix by connecting and disconnecting transmitted light based on an image signal, wherein the pixel is disposed between a transparent substrate having light transmittance. A reinforcing substrate for supporting the plurality of liquid crystal panels, the reinforcing substrate
Provided the display surface of the liquid crystal panels on one plane so as to flush, the refractive index adjusting material having a refractive index substantially equal to that of the upper Symbol transparent substrate, between the reinforcing substrate and the liquid crystal panel A spacer that is provided so as to be filled and that keeps the distance between the reinforcing substrate and the liquid crystal panel constant is mixed with the refractive index adjusting material, so that the distance between the reinforcing substrate and the liquid crystal panel in the spacer is constant.
The dimensions of the outer shape to maintain the
Is set to be less than the roughness of the facing end face.
The liquid crystal display device, characterized by that. 3. Disconnecting and connecting transmitted light based on an image signal.
Pixels for displaying images in a matrix
Liquid crystal panel having a light-transmitting transparent substrate and substrate
And a reinforcing substrate for supporting the plurality of liquid crystal panels, the reinforcing substrate supporting the plurality of liquid crystal panels is provided.
The display surface of each of the above liquid crystal panels is flush with one plane.
Refractive index adjusting material having a refractive index substantially equal to that of the transparent substrate.
To fill the space between the reinforcing substrate and each liquid crystal panel.
To maintain a constant spacing between the reinforcing substrate and the liquid crystal panel.
A spacer is mixed with the refractive index adjusting material, and blocks light from a position different from a pixel in the liquid crystal panel.
The light-shielding layer is formed in a mesh between the transparent substrate and the substrate.
Provided cormorants, the distances between the reinforcing substrate and the light-shielding layer in each of the liquid crystal panel
Where y is the variation of x and the width of the light-shielding layer is x,
-0.2x <y <0.2x
Liquid crystal display device LCD panels are you characterized by being supported respectively on the reinforcing substrate. 4. The liquid crystal panel according to claim 1, wherein said refractive index adjusting material is provided between said liquid crystal panels.
Characterized in that also provided so as to fill the 請
4. The liquid crystal display device according to claim 1, 2 or 3 .