JPH0876075A - Liquid crystal display device - Google Patents

Abstract

PURPOSE: To improve the display image quality in a large screen consisting of liquid crystal panels by decreasing steps between respective adjacent panels. CONSTITUTION: A liquid crystal panel 2 having lots of pixels arranged in a matrix state to display an image by interrupting/transmitting transmission light based on the image signal is provided while pixels are formed between glass substrates 10, 11. A large substrate 3 which supports plural liquid crystal panels 2 is provided in such a manner that the display surfaces of liquid crystal panels 2 are made flush with the surface of the substrate 3. A refractive index control material 9 having almost the same refractive index as that of the glass substrate 11 is packed between the substrate 3 and each liquid crystal panel 2. A spacer 61 to keep a distance between the substrate 3 and the respective liquid crystal panels 2 const. is mixed with the refractive index control material 9.

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 in AV (audio-vidual) equipment and OA (office automation) equipment.

[0002]

2. Description of the Related Art In recent years, home-use televisions used as AV equipment and display devices used in OA equipment have been reduced in weight,
Thinning, low power consumption, high definition and large screen are required. Therefore, the CRT, the liquid crystal display device (L
CD), plasma display device (PDP), EL (ElectroLu
minescent) display device, LED (Light Emitting Display)
Development and commercialization of a large screen are also in progress for display devices such as display devices.

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

On the other hand, in the liquid crystal display device, when the screen size is increased, the defective rate due to the disconnection of the signal line, the pixel defect and the like is rapidly increased in the manufacturing process, and the price of the liquid crystal display device is further increased. Such a problem occurs. Therefore, in order to solve this problem, a plurality of liquid crystal display devices are connected to each other to form one multi-display type liquid crystal display device to increase the size of the screen.

However, in the above-mentioned multi-display type liquid crystal display device, in which the liquid crystal panels are simply joined together, the light of the backlight leaks from the gaps formed in the connection portions of the respective liquid crystal panels, and the joints of the liquid crystal panels are leaked. Is easily noticeable.

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

(Prior Art A) Japanese Unexamined Patent Publication No. 1-213621 and Japanese Unexamined Patent Publication No. 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 No. 127605, a transparent electrode 103 is formed on a polymer dispersion type liquid crystal layer 102.
..., 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 in which a matrix array composed of a source electrode 107, a drain electrode 108, a gate electrode 109, an amorphous silicon 110 and a gate insulating film 112 and a pixel electrode portion 111 is formed on a glass substrate 113. Is provided.

The plurality of liquid crystal display elements 114 ...
By arranging and connecting each pixel electrode portion 111 of each liquid crystal display element 114 on the same plane on the glass reinforcing plate 115 so as to face each transparent electrode 103 forming a pair thereof, We are trying to enlarge the screen.

(Prior art example B) As shown in FIG. 20, in the liquid crystal display device 120 disclosed in Japanese Utility Model Publication No. 6-17178, a plurality of liquid crystal panels 121 ...
By providing the blind layer 122, which covers the gaps of the seams generated in the reinforcing substrate 123 when they are bonded together, the seams between the liquid crystal panels 121 are concealed and the deterioration of the display image quality is avoided, while the large screen size is increased. It is trying to make it.

(Conventional Example C) FIG. 21 shows an example of the configuration of a liquid crystal display device disclosed in Japanese Patent Laid-Open Nos. 5-188340 and 5-341310. That is, in the liquid crystal display device 130, a plurality of transmissive liquid crystal panels 131 ...
Is provided on the rear side of the light source 132 ...
Further, as the image enlarging means or the image parallel moving means, the gradient index lens group 133, ..., The Fresnel lens 13
4 and the screen 135 are the liquid crystal panels 131 ...
Is provided on the front surface side which is the display surface side of.

Each of the refractive index distribution lens groups 133, ..., Fresnel so that the respective display images formed by projecting on the screen 135 by the respective liquid crystal panels 131 ... Are joined together on the screen 135. The lenses 134 ... Are adjusted. As a result, in each display image on the screen 135, a good display image without conspicuous seams is obtained, and a rear projection type large screen liquid crystal display device which avoids deterioration of display image quality is realized.

(Prior Art D) FIG. 22 shows an example of the configuration of the liquid crystal display device disclosed in Japanese Patent Laid-Open Nos. 5-19346 and 5-19347. That is, this 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 ... Consisting of a concave reflecting mirror 145 and a light source lamp 146, and a screen 148 are used.

In such a plurality of projection type image display units 147, a plurality of projection images projected from them are arranged side by side in the vertical and horizontal directions so that they are adjacent to each other on the screen 148. As a result, a front projection type large screen liquid crystal display device which constitutes one large screen is realized.

In this liquid crystal display device 140, the viewing angles of the upper and lower projection type image display units 147 ... Are set upside down, and the light amount at the seam on the large screen is adjusted to the peripheral portion of the large screen. By making the projection image display units 147, ..., And the brightness unevenness of each projection type image display unit 147 ...

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

Further, since a lens optical system such as an image enlarging means and a parallel moving means is used, the light utilization efficiency is lowered and a high-luminance irradiation means is required. Therefore, there is a problem that power consumption increases.

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

Further, in the system of the conventional example D, 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 having a scattering property and a reflective property. Therefore, similar to the method of the conventional example C, there is a problem that a reduction in contrast cannot be denied, and a problem that the power consumption increases because a high-luminance projection lamp is required.

On the other hand, the systems of the conventional examples A and B are direct-view type liquid crystal display devices. That is, a backlight such as a cold cathode tube is placed on the rear surface of the liquid crystal panel. The liquid crystal panel modulates the light of the backlight according to the image information, so that the observer can observe the image information input to the liquid crystal panel. Therefore, unlike the liquid crystal display device of the rear projection type or the front projection type as in the systems of the conventional examples C and D, it is not necessary to use a screen exhibiting a scattering property, a semi-transmissive property, or a reflective property. As a result, it is possible to prevent a decrease in contrast.

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

[0022]

However, the conventional large-screen liquid crystal display devices of 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 warp of the glass substrates 113, ...
A step difference of 10 μm occurs. Therefore, the thickness of the liquid crystal layer 102 sealed in the liquid crystal panel varies.

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

Therefore, among the methods of the conventional example A, the method disclosed in Japanese Patent Laid-Open No. 5-127605 employs the polymer dispersion type liquid crystal display mode as described above, and thereby the display mode is changed. We propose a method to avoid adverse effects.

However, the direct-view polymer dispersion type liquid crystal display mode has a poor contrast in principle, that is, transmission / transmission
While there is a problem that the contrast is deteriorated due to display by switching the scattering, there is also a problem that the driving voltage becomes high and the power consumption increases due to the presence of the polymer, which is an effective solution. Don't

In the method of the conventional example B, as described above, the blind layers 122 are provided on the reinforcing substrate 123 in order to prevent light leaking from the gap when connecting a plurality of liquid crystal panels 121. However, since the glass substrate forming the liquid crystal panel 121 usually has a thickness of 1.1 mm or 0.7 mm, when the liquid crystal display device 120 is observed from an oblique direction, a liquid crystal layer for displaying an image and a blind layer 122 ... Parallax occurs depending on the glass thickness. Therefore, there is a problem that the blind layers 122 are conspicuous in the oblique direction and the joints of the liquid crystal panels 121 are conspicuous.

It is an object of the present invention to solve these problems in the multi-display system and to provide a liquid crystal display device having excellent display image quality in which the seams of the display images by each liquid crystal panel are inconspicuous even in a large screen. I am trying.

[0029]

In order to solve the above-mentioned problems, the liquid crystal display device according to claim 1 has a matrix of pixels for displaying an image by connecting / disconnecting transmitted light based on an image signal. A liquid crystal panel having a large number of liquid crystal panels is provided by forming the pixels between a transparent substrate having light transmissivity and the substrate, and a reinforcing substrate supporting a plurality of liquid crystal panels is provided on one plane of the reinforcing substrate. The display surface of the liquid crystal panel is provided so as to be 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 the space between the reinforcing substrate and each liquid crystal panel. It is characterized in that a spacer for maintaining a constant distance between the substrate and the liquid crystal panel is mixed with the refractive index adjusting material.

A liquid crystal display device according to a second aspect is a liquid crystal panel having a large number of pixels in a matrix for displaying an image by connecting / disconnecting transmitted light based on an image signal.
A reinforcing substrate, which is provided by forming the pixels between a transparent substrate having a light-transmitting property which is the display surface side of the image and the substrate, supports a plurality of liquid crystal panels, and displays the display surfaces of the respective liquid crystal panels. Two polarizing plates that are provided so as to sandwich the reinforcing substrate and each liquid crystal panel are provided such that the polarization axes of the respective polarizing plates are orthogonal to each other, and have a refractive index that is substantially equal to that of the transparent substrate. A rate adjusting material is provided so as to fill the space between the reinforcing substrate and each liquid crystal panel and between the liquid crystal panels, and a spacer for maintaining a constant distance between the reinforcing substrate and the liquid crystal panel is It is characterized by being mixed with the rate adjusting material.

A liquid crystal display device according to a third aspect is the first aspect.
Alternatively, in the liquid crystal display device according to the item 2, the outer dimension of the spacer for maintaining a constant distance between the reinforcing substrate and the liquid crystal panel is set to be smaller than the roughness of the end faces of the liquid crystal panels facing each other. It is characterized by

A liquid crystal display device according to a fourth aspect is the liquid crystal display device according to the first, second or third aspect, wherein the spacer is a plastic bead having elasticity.

A liquid crystal display device according to a fifth aspect is the liquid crystal display device according to the first, second, third or fourth aspect, wherein the light blocking layer for blocking light from a position different from a pixel in the liquid crystal panel is the transparent substrate. -0.2 x <y <, where y is the variation in the distance between the light-shielding layer and the reinforcing substrate in each liquid crystal panel, and the width of the light-shielding layer is x. Each of the liquid crystal panels described above is supported by a reinforcing substrate so as to satisfy the expression 0.2 x.

[0034]

According to the structure described in claim 1, since the refractive index adjusting material having substantially the same refractive index as that of the transparent substrate is filled between the liquid crystal panel and the reinforcing substrate, the joint between the liquid crystal panels. Can be reduced.

That is, generally, a plurality of liquid crystal panels,
When joining the display surfaces so that they are flush with each other, if the end surface of the transparent substrate at the joint of each liquid crystal panel is in contact with a medium having a different refractive index (for example, air), the refraction of light will occur there. Occurs. Further, if the end face is roughened during processing, that is, if the roughness is large, light is refracted and scattered at the end face. These cause the seams between the liquid crystal panels to be conspicuous.

However, in the above structure, as described above, since the refractive index adjusting material having substantially the same refractive index as that of the transparent substrate is filled between the liquid crystal panel and the reinforcing substrate, the light on the end face of the liquid crystal panel is not reflected. Refraction / scattering can be prevented.
As a result, with the above configuration, it is possible to obtain a natural image in which the seams of the liquid crystal panels are inconspicuous.

In addition, since the refractive index adjusting material is mixed with the spacer, each liquid crystal panel is pressed against the reinforcing substrate through the refractive index adjusting material and the spacer when supporting each liquid crystal panel on the reinforcing substrate. Then, the spacers can keep the distance between each liquid crystal panel and the reinforcing substrate more constant.

From this fact, even if the refractive index of the refractive index adjusting material and the refractive index of the transparent substrate are not completely the same, the step between adjacent liquid crystal panels with respect to the reinforcing substrate is reduced. It is possible to make the joint between the liquid crystal panels more inconspicuous.

According to the second aspect of the invention, further, the polarizing plates are provided so as to sandwich the respective liquid crystal panels and the reinforcing substrate supporting them so that their polarization axes are orthogonal to each other. Since the light leaking from the light source is blocked by the crossed Nicols state of the respective polarizing plates, the light is prevented from leaking to the outside, and the seam has a black color. Thereby, the seam can be made more inconspicuous.

According to the third aspect of the invention, the outer dimensions of the spacer are set to be smaller than the roughness of the end faces of the liquid crystal panels facing each other.
Even if the spacers are present in the joints that form the joints of the liquid crystal panels, the spacers are accommodated in the recesses of the end faces of the liquid crystal panels, so that the spacing between the joints of the liquid crystal panels is increased by the spacers. Is avoided. Thereby, even if the spacer is mixed with the refractive index adjusting material, the joint between the liquid crystal panels can be kept inconspicuous.

According to the structure described in claim 4, even if the plastic beads having elasticity have unevenness on the opposing surfaces of the reinforcing substrate and the liquid crystal panel, the deformation of the plastic beads absorbs the unevenness. Therefore, the distance between the reinforcing substrate and each liquid crystal panel can be maintained more constant. Thereby, in the above configuration, the joint between the liquid crystal panels can be made inconspicuous.

According to the structure described in claim 5, each of the liquid crystal panels is supported by the reinforcing substrate so that the position of the light shielding layer satisfies the expression of -0.2 x <y <0.2 x. Even when the image from each liquid crystal panel is observed obliquely, the joint between the liquid crystal panels can be made inconspicuous.

[0043]

【Example】

[Embodiment 1] The following will describe one embodiment of the present invention as Embodiment 1 with reference to FIGS. In the liquid crystal display device according to the present embodiment, as shown in FIG.
A composite panel 1 is provided, which has a plurality of liquid crystal panels 2 that display an image by connecting and disconnecting passing light based on an image signal and are joined together so that the display surfaces of the liquid crystal panels 2 are flush with each other. ing.

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

The composite panel 1 is a direct-viewing 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 (reinforcing substrate) so that the display surfaces of the respective liquid crystal panels 2 are flush with each other, and the rear surfaces of the liquid crystal panels 2 ... A backlight such as a cold cathode tube for supplying the transmitted light to each of the liquid crystal panels 2 is provided on the (lower side in the drawing) side.

The driver for controlling the image signal and the backlight are omitted in the figure. The liquid crystal panel 2 ... Modulates the light of the backlight according to the image signal, that is, connects / disconnects the light, so that the image signal input to the liquid crystal panel 2 can be observed by a viewer as a display image.

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

In the liquid crystal panel 2, a glass substrate 10 (substrate) and a glass substrate (transparent substrate) 11 as a counter substrate which is arranged in parallel with the glass substrate 10 at an interval for enclosing the liquid crystal 7 are provided. It is provided. The glass substrates 10 and 11 have optical transparency.

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

Therefore, on the glass substrate 10, the TFTs 1 are provided 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 a semiconductor thin film such as amorphous silicon (a-Si: H) or polycrystalline silicon (p-Si), and control the supply of image signals to the pixel electrodes 15. are doing. The pixel electrode 15 is made of ITO when used as a transmissive display device.
It is formed of a transparent conductive film such as (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 pixel electrodes 15 as a whole. ing. When performing color display, R (red), G (green), B corresponding to each pixel electrode
The (blue) color filter 4 is formed. The black matrix 5 is provided on the glass substrate 11 on the display surface side.
It may be provided not only on the side but on the glass substrate 10 side which is the back side.

The black matrix 5 is composed of the pixel electrodes 1
It is provided in order to block light from entering the gap between 5 and the TFT area, and blocks light from positions different from the pixel electrodes 15 along the signal lines 13 and 14. It is formed in a net-like manner.

By the way, when the light is transmitted to the area other than the pixel electrodes 15 ..., there arises a problem that the quality in the black display state is lowered and the contrast is lowered. In addition, the TFT 16
When light is incident on ..., Leak current is generated in the TFT channel due to photoexcitation, which causes a problem that the quality of display image quality is deteriorated. 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 the material of this light absorption film,
An organic material in which a pigment or semiconductor particles such as carbon particles or titanium oxide particles is dispersed in a resin, or a group IV semiconductor material such as silicon (Si), carbon (C), germanium (Ge), or tin (Sn) An inorganic material such as an amorphous thin film containing as a main component is used.

When the black organic material is used, it is not necessary to use a vacuum device, and the organic material can be applied by printing or spin coating to form the light absorbing film. Therefore, the black matrix 5 can be manufactured inexpensively and easily. Can be formed.

To form an amorphous thin film using a Group IV semiconductor material, CVD (Chemical Vapor Deposi) is used.
Although it is necessary to use a vacuum device such as an ionizer, there is an advantage that the black matrix 5 having a larger absorption coefficient than that of 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 resin is 10 ⁴ (cm
⁻¹ ), 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 bonding the glass substrates 10 and 11 with the sealing material 6 shown in FIG. 2 so that the pixel electrode 15 and the common electrode 12 face each other. It is performed by enclosing the liquid crystal 7 in.

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

Therefore, in the liquid crystal display device according to this embodiment, an ultraviolet curable resin or a thermosetting combined type ultraviolet curable resin is used as the sealing material 6. The UV-curable resin used here is, for example, an acrylic or epoxy-based resin that activates a polymerization initiator by UV irradiation to cure the resin. Therefore, no heat dripping occurs. Therefore, the sealing material 6 is very close to the pixel.
Can be arranged.

4 (a) and 4 (b) show a liquid crystal panel 2 obtained in this manner as a single large substrate 3 (not shown).
FIG. 6 is a layout diagram of the liquid crystal panels 2.2 when they are arranged above. As shown in FIG. 3A, each liquid crystal panel 2 has one
The side is divided along the dividing lines 17 and 17 near the edge of the image display area, and the divided portions are attached to the large-sized substrate 3 so as to join them.

As shown in FIG. 7B, the width b of the gap (connection portion) generated when the liquid crystal panels 2 are joined together is the line width a of the black matrix 5 required for one pixel.
It is connected to be smaller than. If the width b of the gap is too large as compared with 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, ... And the viewer feels uncomfortable. The pixel has an area substantially equal to that of the color filter 4.

Therefore, for the division of the liquid crystal panel 2, a high degree of positional accuracy and finishing accuracy of the divided surface are required. what if,
If the dividing lines 17, 17 of the liquid crystal panel 2 are distorted or if the liquid crystal panel 2 has unevenness of several hundreds of μm, a further gap is created when the liquid crystal panels 2 are joined together.

However, a general method of dividing the liquid crystal panel 2 by scribing cannot avoid the distortion of the cross section of several hundred μm. A cutting method using a dicing machine is suitable for obtaining high cutting position accuracy and cutting surface finishing accuracy.

Therefore, in this embodiment, the cutting position accuracy is 50 μm or less by the cutting method using the dicing device.
The precision of the sectional surface finish could be suppressed to 5 μm or less, and the joint of the liquid crystal panel 2 could be narrowed. In this way, the width b of the gap is set to the line width a of the black matrix 5, for example, 200 μm or less, so that the pixel pitch of the entire composite panel 1 can be made uniform.

Further, as shown in FIG. 2, the liquid crystal panel 2 ...
When they are spliced together, the refractive index adjusting material 9 is filled in the connection portion of the liquid crystal panels 2. In this embodiment, since the glass substrate 10 and the glass substrate 11 are glass substrates (Corning 7059) having a refractive index of 1.53, the refractive index adjusting material 9 is as follows.
It is necessary to use a material with a refractive index of 1.53.

As such a material, for example, an ultraviolet-curable type which has a double bond such as an acrylic type or an ene / thiol type and is cleaved by irradiation of ultraviolet rays to cause polymerization to proceed. As the resin, 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 attached to the large-sized substrate 3. A refractive index adjusting liquid such as silicon oil having a refractive index of 1.53 can also be used.

The liquid crystal panel 2 joined in this way
The composite panel 1 is formed by disposing the polarizing plates 8 and 8 so that the polarization axes thereof are orthogonal to each other on substantially the entire surfaces of the front and back surfaces of.

Generally, as a multi-display type liquid crystal display device, in a liquid crystal display device in which active matrix type liquid crystal panels using TFTs are simply spliced together, a gap is formed in a connection portion of each liquid crystal panel. The light from the backlight leaks out, and the seams on the LCD panel are noticeable.

However, in the liquid crystal display device of the present embodiment, the polarizing plates 8 and 8 are installed on almost the entire surface of the composite panel 1 which is constructed by joining a plurality of liquid crystal panels 2 ... Since they are installed on the front and back sides of the composite panel 1 in a direction orthogonal to each other, as shown in FIG. Because there is, it is cut off.

As a result, when viewed from an observer A located almost in front of the composite panel 1, the joints of the connection parts of the liquid crystal panels 2 ... Since it can be realized, the joint between the liquid crystal panels 2 can be made inconspicuous.

When a metal light-shielding material such as chromium (Cr) or molybdenum (Mo) is used for the black matrix 5, the surface reflection state 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 becomes weaker by comparison with (the crossed Nicols state of the polarizing plates 8 and 8).

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

For this reason, both the leakage of the backlight light 18 from the gap formed in the connection portion of the liquid crystal panels 2 and the reflected light 19 from the black matrix 5 are in a black state, and it is impossible to distinguish them. As a result, the joints of the liquid crystal panels 2 can be made even less noticeable.

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

However, in the liquid crystal display device of the present embodiment, as shown in FIG. 2, since a plurality of liquid crystal panels 2 ... When a person observes an image from the side of the large-sized substrate 3, steps and scratches due to the influence of variations in glass thickness of the liquid crystal panels 2, warpage, etc. are not exposed on the surface of the composite panel 1. Thereby, in the composite panel 1, it is possible to obtain a natural image in which the seams are less noticeable.

The large substrate 3 is the liquid crystal panel 2
Since the composite panel 1 also serves as a reinforcing plate when the composite panel 1 has a large area by joining a plurality of them, it is possible to increase the impact resistance of the composite panel 1. As a result, in the composite panel 1, it is possible to stably obtain a natural image with even less noticeable seams for a long period of time.

Further, as described above, since the thickness of the liquid crystal layer enclosed in the liquid crystal panel 2 does not vary,
The display is not adversely affected even if the twisted nematic (TN) liquid crystal display mode is used. As a result, it is possible to prevent the display quality from deteriorating in such a display mode.

At the same time, in the structure of the above-mentioned embodiment, it is not necessary to use the direct-view type polymer dispersion type liquid crystal display mode, so that the contrast is not lowered. Further, since the driving voltage can be suppressed low, it is possible to suppress an increase in power consumption.

Further, as described above, when the black matrix 5 is formed by using the 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 by using the organic material. Therefore,
The surface reflection of the black matrix 5 can be reduced more effectively. This makes it possible to make the joint between the liquid crystal panels 2 ... more inconspicuous.

In addition, as described above, in the composite panel 1, since the ultraviolet curable resin or the thermosetting combined type ultraviolet curable resin is used as the sealing material 6, no heat dripping occurs and it is very close to the pixel. It becomes possible to dispose the sealing material 6 on. As a result, it becomes possible to obtain a natural image in which the seams are less noticeable.

Further, as described above, since the width b of the gap between the liquid crystal panels 2 is less than or equal to 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. As a result, it becomes possible to obtain a natural image in which the seams are less noticeable.

Further, as described above, the connection portion of each liquid crystal panel 2 is filled with the refractive index adjusting material 9 having substantially the same refractive index as the glass substrate 10 and the glass substrate 11 which are the substrates constituting the liquid crystal panel 2. Therefore, it is possible to prevent light from being refracted / scattered due to the unevenness of the end face of the substrate in the connection portion of the liquid crystal panels 2 and 2. As a result, it becomes possible to obtain a natural image in which the seams are less noticeable.

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 attached to the large-sized substrate 3, but in this case, when light is reflected at the interface between the large-sized substrate 3 and the glass substrate 11, the display contrast is lowered. Therefore, it is preferable to use the resin having the same refractive index as that of the glass substrate 11 and the large-sized substrate 3. As a result, it becomes possible to obtain a natural image in which the seams are less noticeable.

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

[Embodiment 2] The following will describe another embodiment of the present invention as Embodiment 2 with reference to FIGS. 2 and 6. For convenience of explanation, members having the same functions as those of the members shown in the drawings of the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 6, in the liquid crystal display device of the present embodiment, each of the two bonded liquid crystal panels 2 ... Has two large substrates, that is, the large substrate 3 (substrate) and the large substrate 21.
A composite panel 20 sandwiched between (substrate) is provided. The liquid crystal panels 2 to be used have the same structure as that used in the first embodiment. The driver for controlling the image signal and the backlight are omitted in the figure.

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-sized substrate 21 is further stuck on the liquid crystal panel 2. To attach the large substrate 21, it is preferable to use the refractive index adjusting material 9 used when the liquid crystal panels 2 are joined together.

The composite panel 1 according to the first embodiment (see FIG. 2)
In the above), when the plurality of liquid crystal panels 2 are attached on the same plane of the large-sized substrate 3 with the resin which is the refractive index adjusting material 9, the resin protrudes from the connecting 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 and the polarization state changes. Therefore, the black state due to the crossed Nicols of the polarizing plates 8 cannot be maintained. Therefore, it is necessary to remove this protruding resin.

However, in the composite panel 20 according to the present embodiment, as shown in FIG. 6, since 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 liquid crystal panel. The resin does not squeeze out from the connection portion 2 ... Therefore, the liquid crystal panel 2
It is possible to eliminate light scattering elements such as steps and irregularities between the resin surface of the connection part of ... And the surface of the liquid crystal panel 2 on the glass substrate 10 side.

Therefore, since it is possible to suppress the scattering of the light passing through the connection portion of each liquid crystal panel 2 and prevent the change of the polarization state, the connection portion due to the crossed Nicols of the polarizing plates 8 and 8 looks black. The condition can be kept good. As a result, it is possible to easily obtain a more natural image display in which the seams are less noticeable than in the composite panel 1 according to the first embodiment.

Further, the liquid crystal panels 2 ...
Since it is sandwiched between the large substrate 3 and the large substrate 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 can be significantly facilitated.

Further, the step difference due to the variation of the glass thickness of the liquid crystal panel 2, ..., The warp, etc., which is generated on the back surface (backlight side) of the composite panel 20, and the exposure of the scratches such as the pitching of the edge of the liquid crystal panel 2 ,. It can be prevented by the large substrate 21.

Therefore, since the scattering of the light passing through the connecting portion of the liquid crystal panel 2 is further suppressed and the change of the polarization state is further prevented, it is possible to further prevent the connecting portion due to the crossed Nicols of the polarizing plates 8 and 8 from appearing black. You can keep good. This makes it possible to easily obtain a more natural image display with less noticeable seams.

[Embodiment 3] The following description will discuss still another embodiment of the present invention as Embodiment 3 with reference to FIGS. 7 to 10. For convenience of explanation, members having the same functions as those of the members shown in the drawings of the above-described embodiments are designated by the same reference numerals, and the 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 in the first embodiment, a black matrix is provided at the connecting portion (the end surface of the glass substrate 11) of the liquid crystal panels 2 ... LCD panel 2 vertical to 5
The composite panel 30 in which the second light-shielding films 31 and 31 extending in the surface direction of is formed is provided.

For the second light-shielding films 31 and 31, a black resin in which a pigment or semiconductor fine particles (for example, carbon fine particles or titanium oxide fine particles) are dispersed in resin can be used.

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 connecting portion of the liquid crystal panels 2 ... Since the connection part is cut off in the direct Nicol state of 8 and the connection part looks black, the black of the black matrix 5 and the black part of the connection part cannot be distinguished. As a result, the joints of the liquid crystal panels 2 are difficult to stand out. Composite panel 1 and composite panel 20
Has such characteristics.

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

However, the polarizing plate generally has a viewing angle characteristic. That is, with respect to the light 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 almost in front of the composite panel 1, the liquid crystal panel 2 ... A completely black state of the connection portion can be realized (indicated by a circle in the figure), and the joints of the liquid crystal panels 2 ... Are inconspicuous. However, from the observer B who is diagonally located on the composite panel 1, light leakage of 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 in the figure). (Indicated by a mark), the result is that the seams are slightly conspicuous.

On the other hand, in the liquid crystal display device according to the present embodiment, as shown in FIG. 8, the liquid crystal panels 2 are connected even when viewed by an observer B who is diagonally positioned on the composite panel 30. Since the leaked light generated in the portion is blocked by the second light shielding film 31, it is possible to realize a state in which the connection portion looks completely black (as indicated by a circle in the figure) as in the case of the observer A. .), The seams 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 joint between 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, when designing c≈d, the viewing angle is Is within ± 45 degrees, color filter 4
The image display light passing through is not blocked by the second light shielding film 31.

However, when designing with 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 becomes wide, resulting in a narrow viewing angle of the liquid crystal display device 30. Therefore, the liquid crystal display device 30
In order to prevent the viewing angle from being narrowed, when designing the second light shielding film 31, it is necessary to satisfy c≈d or c> d.

The formation position and shape of the second light shielding film 31 are not limited to those shown in FIGS. 6 to 8, and the observation is performed in the diagonal direction of the composite panel 30 without narrowing the viewing angle of the composite panel 30. LCD panel 2
It suffices if the leakage light of the connection part of ... is blocked.

[Fourth Embodiment] The following description will explain still another embodiment of the present invention as a fourth embodiment with reference to FIGS. 11 and 12. For convenience of explanation, members having the same functions as those of the members shown in the drawings of the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

As described above, in the liquid crystal display device shown in the first to third embodiments, the black matrix 5 is formed of the film made of the black organic material or the inorganic material, and the light reflected from the black matrix 5 is reflected. By suppressing the, the joints of the liquid crystal panels 2 are made inconspicuous.

Here, as described above, the black matrix 5 using the organic material or the inorganic material has a lower light-shielding property than the black matrix using the metal film, and therefore the thickness is sufficient to obtain a sufficient light-shielding property. Is required to be 1 μm or more. However, if the thickness is 1 μm or more, the uniformity of the cell gap of the liquid crystal panels 2 may be adversely affected.

On the other hand, in the liquid crystal display device according to the present embodiment, as shown in FIG. 11, the black matrix 5 is formed by laminating the light absorption film 41 and the metal film 42.
(First light shielding film) is formed. The metal film 42 can be made of chromium (Cr), aluminum (Al), or the like.

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

Further, as shown in FIG. 12, a composite panel 45 having two large-sized substrates 3 and 21 and employing a black matrix 5 can be used as in the composite panel 20 of the second embodiment. Also in this case, the uniformity of the cell gaps of the liquid crystal panels 2 can be improved in the same manner as described above.

In this embodiment, the black matrix 5 formed of the light absorption 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. Further, instead of the black matrix 5, only the metal film 42 is formed on the glass substrate 1.
The structure may be such that it is provided on the 0 side and only the light absorption film 41 is provided on the glass substrate 11 side.

[Fifth Embodiment] The following description will explain still another embodiment of the present invention as a fifth embodiment with reference to FIG. For convenience of explanation, members having the same functions as those of the members shown in the drawings of the above-described embodiment are designated by the same reference numerals, and the 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 a plurality of liquid crystal panels 2 are joined together. The liquid crystal display device of the present invention is not limited to the configuration in which these are provided, and may be 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 thickness of each of the liquid crystal panels 2 joined by joining the liquid crystal panels 2 without using a reinforcing substrate. A pair of polarizing plates 8 and 8 on both ends in the vertical direction
Are attached so that their polarization axes are orthogonal to each other, and the 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
Since the polarizing plates 8 serve as a reinforcing plate in the composite panel 50, the strength of the composite panel 50 can be maintained. As a result, the impact resistance of the composite panel 50 can be improved, so that a natural image in which the seams of the liquid crystal panels 2 are not conspicuous can be stably obtained for a long period of time.

[Sixth Embodiment] The following description will explain still another embodiment of the present invention as a sixth embodiment with reference to FIG. 1 and FIGS. For convenience of explanation, members having the same functions as the members shown in the drawings of the above-described respective embodiments are designated by the same reference numerals, and the description thereof will be omitted.

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

However, the above composite panel has the following problems. Normally, the glass substrates 11 and 10 used for the liquid crystal panel 2 are said to have a fairly flat surface, but the thickness thereof has a maximum thickness unevenness of about 30 μm.

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

Even if such a step is generated, the refractive index adjusting material 9 filled between the joint surfaces of the liquid crystal panels 2 ...
However, if the glass substrates 10 and 11 of the liquid crystal panel 2 have exactly the same spectral transmittance and have the same refractive index in the entire visible light region, in principle, the glass substrates 10 and 11 described above.
The step of 11 has no optical effect, and the joint at the joint should be indistinguishable.

However, in reality, it is extremely difficult to find the refractive index adjusting material 9 which satisfies the above-mentioned perfect conditions, and therefore the following mechanism causes a problem that the joint at the joint is slightly conspicuous. .

(1) The refraction angle of light passing through the step portion generated at the joint portion is different (see FIG. 15).

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

Further, each of the liquid crystal panels 2 shown in FIG.
Since the positions of the liquid crystal 7 in the left and right liquid crystal panels 2 are different, the images displayed on the respective liquid crystal panels 2 become unnatural and give the observer a feeling of strangeness.

Therefore, in the liquid crystal display device according to the present embodiment, as compared with the composite panel 20 according to the second embodiment, as shown in FIG.
Is mixed and the composite panel 60 is provided.

First, a method of manufacturing the composite panel 60 will be described. Between the large substrate 3 and the liquid crystal panel 2,
A refractive index adjusting material 9 having a refractive index of 1.54 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 each liquid crystal panel 2 ... is temporarily fixed to the large-sized substrate 3. Then, the excess refractive index adjusting material 9 is pressed against the liquid crystal panels 2 with a predetermined load in the thickness direction thereof from between the liquid crystal panels 2 and the large-sized substrate 3. Push out.

At this time, the refractive index adjusting material 9 and the spacer 61 used are the glass substrate 1 used in the liquid crystal panel 2.
The refractive index adjusting material 9 and the spacer 61 have the same refractive index as that of the glass substrate 1.
The difference in refractive index of 1 is 0 at 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 spacer 61 allows the refractive index adjusting material 9 to have a more uniform thickness.
It is possible to prevent the occurrence of a step on the glass substrate 11 in each liquid crystal panel 2. Therefore, the refraction angles of the light transmitted through the liquid crystal panels 2 are all equal, and the scattering of the light can be avoided. Further, the liquid crystal having good display image quality with no visible seams in the liquid crystal panels 2. It becomes possible to obtain a display device.

Further, the reinforcing plate 21 may be used also on the backlight side. In Example 6, an example in which an ultraviolet curable resin was used as the material of the refractive index adjusting material 9 to be filled was used. However, if the refractive index satisfies the above conditions, a thermosetting resin is used. An epoxy adhesive or the like can also be used.

Further, although the example in which the plastic beads are used as the spacer 61 has been described, silica beads or the like can be used as long as they satisfy the above conditions. However, since the plastic beads have greater elasticity than silica beads, it is possible to further absorb the variation in the thickness of the glass substrate 11 or the large-sized substrate 3, and the spacer 61 prevents the step between the glass substrates 11 from occurring. It is possible to exert an excellent effect in that it can be suppressed.

In the sixth embodiment, the steps of the liquid crystal panels 2 ... Are eliminated on the side of the glass substrate 11 forming the liquid crystal panel 2.
Although a step may occur on the 0 ... side, if the step is generated on the glass substrate 10 side, it does not adversely affect the visibility of the liquid crystal panels 2 ... The inventors have confirmed experimentally. Therefore, it is not necessary to consider the step generated on the glass substrate 10 side as much as the step generated on the glass substrate 11 on the display surface side.

Further, when a load is applied to each liquid crystal panel 2 in order to push out the excess refractive index adjusting material 9, it is necessary to apply a very large pressure when the area of each liquid crystal panel 2 becomes large. In order to perform this with a small pressure, if the viscosity of the refractive index adjusting material 9 is made small and the particle size of the spacer 61 mixed in is made large, the refractive index adjusting material 9 can be easily pushed out 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 material adjusted to various viscosities. The larger the particle diameter of the spacer 61, the more preferable, but the larger the gap 62 between the joint surfaces 2a of the liquid crystal panels 2 is unsuitable. Therefore, the waviness of the joint surface 2a, that is, the roughness is small. 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 difference when joining the plurality of liquid crystal panels 2 ... Has been described. Next, the allowable range of the step difference will be described.

FIG. 16 is an enlarged view of a joint portion (joint portion) of each liquid crystal panel 2. If there is a case where the width x of the black matrix 5 shown in the figure changes by about 20% with respect to the widths of the black matrices 5 at other locations, the observer can use each liquid crystal panel 2 at that point. The inventors of the present application have experimentally verified that the displayed image has a feeling of strangeness.

Therefore, in the case of ± 45 degrees which is a general viewing angle range in the composite panel 60, each liquid crystal panel 2 ...
The visible width of the black matrix 5 at the joint portion of 1 may be within a range of about 20% increase / decrease depending on whether there is a step or not.

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, ... 45 degrees with respect to the normal to the display surface of each liquid crystal panel 2 ,. It is the figure which showed geometrically the width x'of the black matrix which an observer actually sees from the direction.
From the figure, it can be seen that x ′ = x / (2 ^1/2 ).

On the other hand, FIG. 17B shows each liquid crystal panel 2.
FIG. 6 is a diagram geometrically showing the width x ″ of the black matrix actually observed by an observer when viewed from an oblique 45-degree direction when the black matrix at the joining portion has a step y.
From the figure, it can be seen that x ″ = (x + y) / (2 ^1/2 ).

If the relationship between x'and x "is increased or decreased by about 20%, the observer does not feel uncomfortable with 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 the range satisfying such a condition (Equation 2), it is possible to stably manufacture a liquid crystal display device having excellent display image quality.

As described above, in the structure and method of the sixth embodiment, the refractive index adjusting material 9 containing the spacer 61 is filled between the glass substrate 11 and the large-sized substrate 3 of the liquid crystal panel 2,
Further, since there is a manufacturing process for removing the excess 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 the joint portion of each liquid crystal panel 2.

As a result, as shown in FIG. 18, the refraction angles of the transmitted light are all equal and the scattering of the light is also prevented, so that a liquid crystal display device having a good display quality with no visible seams is manufactured. You can stabilize what you do.

Further, by setting the particle size of the spacer 61 to be smaller than the maximum value of the waviness generated on the bonding surface 2a of the liquid crystal panel 2, that is, the maximum roughness.
Since the spacers 61 prevent the spaces between the liquid crystal panels 2 from increasing, the spacers 61 are
Is added, the deterioration of the display image quality on the composite panel 60 is prevented.

As described above, in the structure of the sixth embodiment, when a plurality of liquid crystal panels 2 ... Are joined to each other to form the composite panel 60, the joints of the liquid crystal panels 2 ... It is possible to further improve the display image quality in a direct-viewing type liquid crystal display device having a large screen according to the method.

Further, according to the manufacturing method of Example 6, it is possible to stably manufacture a direct-viewing type liquid crystal display device having a large screen by the multi-display system, which is further excellent in display image quality, and to increase the size of the liquid crystal display device. 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 substrates for supporting a plurality of liquid crystal panels each having a transparent substrate are provided on one plane of the reinforcing substrate. The display surface is provided so as to be flush, the refractive index adjusting material having a refractive index substantially equal to the transparent substrate,
A spacer is provided so as to fill the space between the reinforcing substrate and each liquid crystal panel, and a spacer for maintaining a constant distance between the reinforcing substrate and the liquid crystal panel is mixed with the refractive index adjusting material.

Therefore, in the above structure, by mixing the refractive index adjusting material with the spacer, each liquid crystal panel is supported by the reinforcing substrate through the refractive index adjusting material and the spacer when the liquid crystal panel is supported by the reinforcing substrate. When pressed against, the spacers can keep the distance between the liquid crystal panels and the reinforcing substrate more constant.

Therefore, in the above structure, 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 difference between adjacent liquid crystal panels with respect to the reinforcing substrate is reduced. Therefore, the joint between the liquid crystal panels can be made less visible, and an excellent display image quality can be realized on a large screen.

A liquid crystal display device according to claim 2 of the present invention comprises:
Further, the two polarizing plates sandwiching the reinforcing substrate and each liquid crystal panel supported by the reinforcing substrate are provided such that the polarization axes of the respective polarizing plates are orthogonal to each other.

Therefore, in the above structure, since the light passing through the joint between the liquid crystal panels can be blocked by the polarizing plates, the joint can be made more inconspicuous.
This has the effect of achieving excellent display quality on a large screen.

A liquid crystal display device according to claim 3 of the present invention is
Further, the outer dimension of the spacer for maintaining a constant distance between the reinforcing substrate and the liquid crystal panel is set to be smaller than the roughness of the end faces of the liquid crystal panels facing each other.

Therefore, in the above structure, since the outer dimensions of the spacers are set as described above, even if the spacers are present in the joints that are the joints of the liquid crystal panels, the spacers have the same shape. Since it is accommodated in the concave portion of the end face of the panel, it is possible to prevent the spacer from increasing the bonding interval of the liquid crystal panels.

Thus, in the above structure, even if the spacer is mixed with the refractive index adjusting material, the joint between the liquid crystal panels can be kept inconspicuous, so that excellent display image quality can be realized on a large screen. Has the effect.

A liquid crystal display device according to claim 4 of the present invention is
Further, the spacer has a structure of plastic beads having elasticity.

Therefore, in the above structure, the deformation of the plastic beads having elasticity can absorb the unevenness on the respective facing surfaces of the reinforcing substrate and the liquid crystal panel, so that the interval between the reinforcing substrate and each liquid crystal panel can be made more constant. Since it can be maintained and the joint between the liquid crystal panels can be made inconspicuous, an excellent display image quality can be realized on a large screen.

A liquid crystal display device according to claim 5 of the present invention is
Further, a light blocking layer that blocks light from a position different from the pixel in the liquid crystal panel is provided so as to form a mesh between the transparent substrates, and each distance between the light blocking layer and the reinforcing substrate in each liquid crystal panel. Is defined as y and the width of the light-shielding layer is defined as x, each of the liquid crystal panels is supported by the reinforcing substrate so as to satisfy the expression −0.2 x <y <0.2 x.

Therefore, in the above structure, 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 formula of 0.2 x <y <0.2 x, even if the image from each of the liquid crystal panels is observed obliquely, Since the seams can be made inconspicuous, an excellent display quality can be achieved on a large screen.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a composite panel in Example 6 of a liquid crystal display device of the present invention.

FIG. 2 is a schematic configuration diagram of a composite panel in Example 1 of the liquid crystal display device of the present invention.

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

FIG. 4 is an explanatory view showing a step of forming the composite panel, (a) is a plan view before joining two liquid crystal panels, and (b) is joining two liquid crystal panels. FIG.

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 in Example 2 of the liquid crystal display device of the present invention.

FIG. 7 is a schematic configuration diagram of a composite panel in Example 3 of the liquid crystal display device of the present invention.

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

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

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

FIG. 11 is a schematic configuration diagram of a composite panel in Example 4 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 modification of the composite panel.

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

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

FIG. 17 is an explanatory diagram showing a permissible range of the position error of each liquid crystal panel, where (a) shows the case where the position error does not occur and (b) shows the case where the position error occurs. It is an explanatory view shown.

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

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

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

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

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

[Explanation of symbols]

 2 Liquid Crystal Panel 3 Large Substrate (Reinforcing Substrate) 9 Refractive Index Adjusting Material 10 Glass Substrate (Substrate) 11 Glass Substrate (Transparent Substrate) 61 Spacer

Claims (5)

[Claims] 1. A liquid crystal panel having a large number of pixels for displaying an image by connecting and disconnecting transmitted light based on an image signal in a matrix form, wherein the pixel is provided between a transparent substrate having a light transmitting property. A reinforcing substrate that is formed to support a 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 the space between the reinforcing substrate and each liquid crystal panel, and a spacer for maintaining a constant gap between the reinforcing substrate and the liquid crystal panel is provided on the refractive index adjusting material. A liquid crystal display device characterized by being mixed. 2. A liquid crystal panel having a large number of pixels for displaying an image by connecting and disconnecting transmitted light based on an image signal in a matrix, and a transparent substrate having a light-transmitting property on the display surface side of the image. A reinforcing substrate, which is provided by forming the pixels between the liquid crystal panel and the substrate, and which supports a plurality of liquid crystal panels, is provided so that the display surfaces of the liquid crystal panels are flush with each other, and the reinforcing substrate and the liquid crystal panels are sandwiched between them. Two polarizing plates are provided so that the polarization axes of the respective polarizing plates are orthogonal to each other, and a refractive index adjusting material having a refractive index substantially equal to that of the transparent substrate is provided between the reinforcing substrate and each liquid crystal panel. And a liquid crystal display device characterized in that a spacer provided so as to fill the space between the liquid crystal panels and for maintaining a constant distance between the reinforcing substrate and the liquid crystal panel is mixed with the refractive index adjusting material. . 3. The outer dimension of the spacer for maintaining a constant distance between the reinforcing substrate and the liquid crystal panel is set to be smaller than the roughness of the end faces of the liquid crystal panels facing each other. Claim 1 or 2 characterized
The described liquid crystal display device. 4. The liquid crystal display device according to claim 1, wherein the spacer is a plastic bead having elasticity. 5. The liquid crystal display device according to claim 1, 2, 3 or 4, wherein a light blocking layer for blocking light from a position different from a pixel in the liquid crystal panel is reticulated between the transparent substrates. And the width of the light shielding layer is x, and the variation of the distance between the light shielding layer and the reinforcing substrate in each liquid crystal panel is y,
A liquid crystal display device, wherein each of the liquid crystal panels described above is supported by a reinforcing substrate so as to satisfy the expression −0.2 x <y <0.2 x.