JPH11202308A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device with excellent display quality by avoiding the conspicuousness of the joint of liquid crystal panels with each other or substrates with each other in the liquid crystal display device for enlarging a screen by connecting the plural liquid crystal panels or substrates on the side face. SOLUTION: At the connections 12 of the two liquid crystal panels 11a with each other for constituting a large-sized panel 11, supposing that the refractive index of a TFT substrate 13 and a CF substrate 14 is defined as (n), the width of an adjacent BM 14c formed on the CF substrate 14 as A and the thickness of the TFT substrate 13 and the CF substrate 14 as B, |A|>Btan sin<-1> (1/ 2n)} is realized. Thus, since light is transmitted through the connection part 12 and interrupted at the adjacent BM 14c, the joint of the connection part 12 is prevented from becoming conspicuous.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to audio-visual (AV) equipment and office automation (OA).
Regarding a direct-view type liquid crystal display device that can be used for equipment,
The present invention relates to a liquid crystal display device having a large screen and high display quality, in which a plurality of liquid crystal panels are connected at their side surfaces.

[0002]

2. Description of the Related Art In recent years, for display devices used in audiovisual equipment and office automation equipment, weight reduction, thinning, low power consumption, high definition, and large display screen (hereinafter referred to as "large") have been proposed. , Large screen)
Is required. Among them, especially for large screens, liquid crystal display (LCD), plasma display (PDP), CRT (Cathode Ray Tube) system, etc.
Various display devices such as an electroluminescence (EL) display device and a light emitting diode (LED) display device are being developed and put to practical use.

[0003] Among them, liquid crystal display devices have the advantages of being significantly thinner (depth) than other display devices, low power consumption, and being easy to be full-colored. It is used in the field, and there is great expectation for a large screen.

However, when the size of the liquid crystal display device is increased, a defective rate caused by a disconnection of a signal line or the like or a defect of a pixel rapidly increases in a manufacturing process. In addition to this, the large screen makes the manufacturing process complicated, and as a result,
There is a problem that the price of the liquid crystal display increases.

Therefore, in order to solve the above problems,
A plurality of liquid crystal panels are arranged side by side so as to be connected on the same plane, or at least one of a pair of light-transmitting substrates constituting the liquid crystal panel, and a plurality of small substrates are placed on their side surfaces. 2. Description of the Related Art A liquid crystal display device for realizing a large screen by using a connection substrate formed by connection is known.

In the above-described method for increasing the size of the screen, a technique is required for making the joints at the connection portions between the liquid crystal panels and between the small substrates inconspicuous on the display screen of the liquid crystal display device. As a liquid crystal display device using such a technique, for example, a liquid crystal display device with less noticeable joints proposed in Japanese Utility Model Application Laid-Open No. 60-191029 and Japanese Patent Application Laid-Open No. H08-122767 is known.

[0007]

However, in the liquid crystal display device disclosed in the above-mentioned Japanese Patent Application Laid-Open No. Hei 8-122770, it is difficult to completely prevent the joints of the connecting portions from being noticeable. . This is the refractive index of the resin serving as the refractive index adjusting material filling the gap of the connection portion,
This is because it is difficult to make the refractive index of the glass substrate used as the substrate substantially the same.

If the refractive index of the refractive index adjusting material and the refractive index of the glass substrate cannot be made substantially the same, the color balance of the light transmitted through the joint will be lost when the joint of the connecting portion is viewed from an oblique direction, and the display screen will not be displayed. This makes the joint stand out. Further, of the light transmitted through the joint, the light transmitted through the edge of the liquid crystal panel or the substrate is scattered by the edge, and also makes the joint stand out on the display screen. As a result, there is a problem that the display quality of the obtained liquid crystal display device is reduced.

More specifically, in a conventional liquid crystal display device, as shown in FIGS.
Is filled with a refractive index adjusting material 53 in the connecting portion 52 of the substrate 61 or the connecting portion 62 of the substrates 61. The light 54 transmitted through the refractive index adjusting material 53 is transmitted to the connection portion 52 or the connection portion 6.
2 without being blocked by the black matrix 55 or the black matrix 65 adjacent to the color filter 5.
6 is transmitted. Further, the light 57 transmitted through the edge of the liquid crystal panel 51 or the substrate 61 is not blocked by the black matrix 55 or the black matrix 65.

Here, when the refractive index of the refractive index adjusting material 53 is not substantially the same as the refractive index of the substrate 51a or the substrate 61, the light 54 breaks the color balance of the entire display screen and the connection portion 52 or the connection The joint of the portion 62 is made to stand out. On the other hand, since the light 57 is scattered when passing through the edge portion, the color balance of the entire display screen is also lost, and the joint of the connection portion 52 or the connection portion 62 is also made to stand out.

As described above, in the conventional liquid crystal display device, it is still insufficient to increase the screen size of the liquid crystal display device while maintaining high display quality due to the above-mentioned problems.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a liquid crystal display device that enlarges a screen by connecting a plurality of liquid crystal panels and substrates on the side surfaces thereof.
An object of the present invention is to provide a liquid crystal display device having excellent display quality by avoiding noticeable joints between connection portions between liquid crystal panels or between substrates.

[0012]

According to a first aspect of the present invention, there is provided a liquid crystal display device comprising: one large panel formed by connecting a plurality of liquid crystal panels on a side surface thereof; In a liquid crystal display device comprising: a pair of light-transmitting substrates constituting the liquid crystal panel, the refractive index of n,
The width of the adjacent light-shielding portion existing at a position adjacent to the connection portion among the light-shielding portions formed on one surface of the substrate is A.
Further, assuming that the thickness of the substrate is B, the following relational expression, | A |> Btan {sin ^-1 (1 / {2n)}, is established at the connection portion between the liquid crystal panels. It is characterized by having.

According to the configuration of the first aspect, since the above-mentioned relational expression is satisfied at the connection part between the liquid crystal panels, the distance between the pixel adjacent to the connection part and the connection part, That is, the width A of the adjacent light shielding portion can be optimized. Therefore, of the light incident on the large panel, most of the light transmitted through the connection portion is blocked by the adjacent light shielding portion. Therefore, for example, even when the refractive index adjusting material filled in the connection portion is different from the refractive index of the substrate, light transmitted through the connection portion does not reach the display screen. The joints at the connection portions can be made inconspicuous. As a result, a large-screen liquid crystal display device having high display quality can be obtained.

According to a second aspect of the present invention, there is provided a liquid crystal display device comprising:
In order to solve the above problems, at least one of a pair of light-transmitting substrates forming a liquid crystal panel is a single connection substrate formed by connecting a plurality of small substrates on their side surfaces. A liquid crystal display device having a liquid crystal panel, wherein a refractive index of the small substrate is n, and a light shielding portion formed on one surface of the pair of substrates is located at a position adjacent to the connection portion. When the width between the end portion of the adjacent light-shielding portion and the contact portion that is in contact with the connection portion at a position close to the end portion is C, and the thickness of the small substrate is D, The following relational expression, | C |> Dtan {sin ^-1 (1 / {2n)}, is established at the connection between the small substrates.

According to the second aspect of the present invention, since the above-mentioned relational expression is satisfied at the connection between the small substrates, the interval between the pixel adjacent to the connection and the connection, that is, , The width C can be optimized. Therefore, of the light incident on the liquid crystal panel, most of the light transmitted through the connection portion is blocked by the adjacent light shielding portion. Therefore, for example, even when the refractive index adjusting material filled in the connection portion is different from the refractive index of the substrate, light transmitted through the connection portion does not reach the display screen. The joints at the connection portions can be made inconspicuous. As a result, a large-screen liquid crystal display device having high display quality can be obtained.

According to a third aspect of the present invention, there is provided a liquid crystal display device comprising:
In order to solve the above-described problem, in addition to the configuration described in claim 2, the small substrate is a film-shaped substrate.

According to the third aspect of the present invention, the thickness of the liquid crystal panel can be further reduced since the thickness of the film-shaped substrate is smaller than that of the normal substrate. Further, since the thickness of the liquid crystal panel is reduced, it is possible to further reduce the range in which light transmitted through the connection portion reaches the display screen. Therefore, the width of the light-shielding portion can be made narrower than in the related art, so that the aperture ratio of the pixel can be improved. Therefore, the displayed image can be made higher definition.

A liquid crystal display device according to a fourth aspect of the present invention comprises:
In order to solve the above-mentioned problem, in addition to the configuration according to claim 1, 2 or 3, the pair of substrates is provided in a region to be a liquid crystal layer sealed between the pair of substrates in the liquid crystal panel. It is characterized in that an adhesive spacer for bonding the substrates and maintaining a constant gap between the substrates is formed.

According to the structure of the fourth aspect, the structure of the liquid crystal panel formed by bonding the substrates is strengthened by the spacer having the adhesive property. Therefore, the deformation of the liquid crystal panel is suppressed in the vicinity of the connection portion between the liquid crystal panels or between the small substrates, and the above relational expression is more accurately established at the connection portion, and the joint of the connection portion does not stand out. . Moreover, even if the display screen of the liquid crystal display device becomes large, the cell gap of the liquid crystal layer can be maintained uniformly over the entire display screen. As a result, the display quality can be further improved as compared with the related art.

According to a fifth aspect of the present invention, there is provided a liquid crystal display device comprising:
In order to solve the above-mentioned problem, in addition to the configuration described in claim 4, a sealing material for enclosing a liquid crystal material in a liquid crystal layer is made of the same material as the spacer.

According to the structure of the fifth aspect, the spacer and the sealing material can be formed in one step. Therefore, the manufacturing process of the liquid crystal display device can be further simplified.

[0022]

[Embodiment 1] One embodiment of the present invention will be described below with reference to FIGS. Note that the present invention is not limited by this. The liquid crystal display device according to the present invention includes:
In a liquid crystal display device in which two liquid crystal panels are connected on their side surfaces, in order to prevent light transmitted through the connection portion between the liquid crystal panels from reaching the display screen, a pixel adjacent to the connection portion and the connection portion are connected to each other. And the width of the light-shielding portion existing between them is optimized.

The liquid crystal display device 10 according to the present embodiment has the structure shown in FIG.
As shown in FIG. 2, two liquid crystal panels 11a are connected on the side surface to form one large panel 11.
The reinforcing substrates 17 and 17 are respectively bonded to the front and back surfaces with an adhesive 19a, and a polarizing plate (polarizer) 18 is disposed on almost the entire surface of each of the front and back surfaces in a direction in which the respective polarization axes are orthogonal to each other. I have. The reinforcing substrate 17
Reference numeral 17 does not need to be bonded to the front and back surfaces of the large panel 11, and may be either one. In other words, it is only necessary to bond the liquid crystal panels 11a so that the structure of the large panel 11 formed by connecting the liquid crystal panels 11a can be reinforced.

In the liquid crystal panel 11a, a pair of light-transmitting substrates 13 and 14 are opposed to each other and bonded together with a sealing material 15, and a liquid crystal layer 16 is formed between the substrates 13 and 14. One of the pair of substrates 13 and 14 is an active matrix substrate 13, and the other is a color filter substrate 14.

The active matrix substrate 13 has active elements and pixel electrodes (not shown), wirings such as scanning lines and signal lines, etc. formed on the opposite surface thereof. As the active element, MIM (Metal Insulator Metal) is used.
) Or TFT (thin film transistor). In the present embodiment, this active element is TF
T, the active matrix substrate 1
3 is abbreviated as TFT substrate 13. On the other hand, the color filter substrate 14 includes a color filter (hereinafter abbreviated as CF) 14a,
Black matrix (hereinafter abbreviated as BM) which is a light shielding portion
14b, an adjacent BM 14c which is an adjacent light-shielding portion, an opposing electrode (not shown), and the like are formed on the opposing surface. In addition,
Hereinafter, the color filter substrate 14 is abbreviated as the CF substrate 14.

The joint 12 between the liquid crystal panels 11a is filled with a refractive index adjusting material 19b. That is,
The liquid crystal panels 11a and 11a are connected on their side surfaces by a refractive index adjusting material 19b, thereby forming the large panel 11. Here, among the BMs 14b on the CF substrate 14, the BM 14b formed adjacent to the layer of the refractive index adjusting material 19b is the above-described adjacent BM 14c.

As the substrates 13 and 14, glass substrates are preferably used. In this embodiment, Asahi Glass Co., Ltd .: trade name AN is used as the glass substrate.
As the adhesive 19a and the refractive index adjusting material 19b, it is preferable to use a transparent resin having substantially the same refractive index as that of the glass substrate, but it is not particularly limited. Since it is difficult to make the refractive index of the resin substantially equal to the refractive index of the glass substrate, in the liquid crystal display device 10 according to the present invention, the connection unit 12 satisfies the following relational expression. . This makes it possible to avoid a decrease in display quality due to a difference in refractive index. Therefore, the resin is not particularly limited. The adhesive 19a and the refractive index adjusting material 19b may be made of the same resin. In addition,
In this embodiment, it is assumed that the refractive index of the liquid crystal material in the liquid crystal layer 16 and the refractive index of the CF 14a are the same as the refractive index of the glass substrate.

The liquid crystal display device 10 according to the present invention is configured such that light transmitted through the layer of the refractive index adjusting material 19b in the connection portion 12 does not reach the display screen through the CF 14a. In other words, the refractive index adjusting material 1
The light transmitted through 9b is blocked by the adjacent BM 14c. Therefore, the width of the adjacent BM 14c, that is,
It is necessary to optimize the distance between the pixel (CF 14 a in FIG. 1) adjacent to the connection portion 12 and the connection portion 12.

In order to optimize the distance, the connection 1
2, the width of the adjacent BM 14c is A,
When the thickness of the FT substrate 13 and the thickness of the CF substrate 14 are B, and the refractive indices of the TFT substrate 13 and the CF substrate 14 are n, the following relational expression (1) holds. Note that TF
It is assumed that both the T substrate 13 and the CF substrate 14 have the same thickness.

| A |> Btan {sin ^-1 (1 / {2n)} (1) Generally, when observing the display screen of a liquid crystal display device, if there is a visual sense of ± 45 ° on the left and right sides It is enough. Therefore, if the above relational expression (1) is satisfied, the liquid crystal panel 11a
Even when the connecting portions of the connecting portions are observed from a viewing angle of ± 45 ° on the left and right, it is possible to avoid the joints of the connecting portions 12 from being conspicuous.

The above-mentioned relational expression (1) will be described in more detail. As shown in FIG. 2, light 32 incident from the back of the liquid crystal display device 10 at an incident angle θ ₁ passes through the liquid crystal display device 10. The light is transmitted at an angle θ ₂ (transmission angle) and thereafter emitted at an emission angle θ ₁ . At this time, between the incident angle (emission angle) θ ₁ and the transmission angle θ ₂ , the TFT substrate 13 and the CF substrate 1
When the refractive index of 4 is n and the refractive index of air is 1,
The following relational expression (2) holds according to Snell's law.

Sin θ ₁ = nsin θ ₂ (2) As described above, when observing the display screen of the liquid crystal display device, it is sufficient to have a visual sense of ± 45 ° in the left and right directions. In other words, it is sufficient that the light emission angle falls within the range of ± 45 ° left and right. Therefore, when the transmission angle θ ₂ is calculated so that the incident angle (emission angle) θ ₁ = 45 °, θ ₂ = sin
^-1 (1 / √2n).

In order to make the joint of the connecting portion 12 inconspicuous when observing the liquid crystal display device 10 from an oblique direction, the light transmitted through the refractive index adjusting material 19b is cut off by the adjacent BM 14c to display the same on the display screen. What is necessary is just to prevent light from reaching. Therefore, as is clear from FIG.
The following relational expression (3) is established between the thickness B (B ₁ and B _{2 in} FIG. 2) of the TFT substrate 13 or the CF substrate 14 and the width A of the adjacent BM 14c. by this,
Of the light incident near the connection portion 12, the refractive index adjusting material 19
b through the adjacent BM 14c
Can be shut off.

A / B> tan θ ₂ (3) In the above relational expression (3), the sum of the thickness of the TFT substrate 13 and the thickness of the liquid crystal layer 16 is calculated as shown in FIG. B ₁ and the thickness of the CF substrate 14 (CF14a or BM14
when b of the included) thick and B _2, the B ₁ and B ₂
Are considered to be B having almost the same value (B ₁
= B ₂ = B). This is because the thickness of the liquid crystal layer 16 is almost negligibly small compared to the thickness of the glass substrate used for the TFT substrate 13 and the CF substrate 14.

Specifically, in the present embodiment, the TFT substrate 1
The glass substrate (AN made by Asahi Glass) used as 3 and the CF substrate 14 has a thickness of 700 μm. On the other hand, the thickness of the liquid crystal layer 16 is about 5 μm. Therefore, compared to the thickness of the glass substrate, the liquid crystal layer 1
The thickness of 6 can be almost neglected. Note that CF
The thickness of the CF 14a, BM 14b, and adjacent BM 14c formed on the substrate 14 is also several μm, and the thickness of the wiring and the pixel electrode formed on the TFT substrate 13 (not shown) is about the same. It can be almost ignored compared to the thickness of the glass substrate.

In the liquid crystal display device 10 according to the present embodiment, the relational expression (1) derived from the above relational expressions (2) and (3) is established at the connection portion 12 between the liquid crystal panels 11a. . Therefore, as shown in FIG.
The light (arrow 31 in the figure) transmitted through the refractive index adjusting material 19b is almost blocked by the adjacent BM 14c and does not transmit through the CF 14a.

Therefore, on the display screen of the liquid crystal display device 10, the connecting portion 12 is formed by the light transmitted through the refractive index adjusting member 19b.
Prevents the occurrence of color balance collapse in the vicinity. FIG.
As shown in (1), the light 32 transmitted through the refractive index adjusting member 19b is also prevented from being scattered at the edge portions (the TFT substrate 13 in FIG. 3) of the pair of substrates constituting the liquid crystal panel 11a. As a result, when an observer observes the display screen of the liquid crystal display device 10, the joint between the liquid crystal panels 11a can be made less noticeable.

In the above relational expression (1), the adjacent B
The upper limit of the width A of M14c is not particularly limited. However, on the display screen of the liquid crystal display device 10, if the interval (pixel pitch) between the pixels adjacent to the joint of the connection portion 12 is not substantially the same as the pixel pitch of the liquid crystal panel 11a, the joint will be conspicuous. Therefore, as shown in FIG. 2, in the connection portion 12, the sum 2A + P of the two adjacent BMs 14c and the width P of the layer of the refractive index adjusting material 19b is substantially the same as the width Q of the BM 14b in other regions. Is preferred. That is, 2A + P = Q
It is particularly preferable to set the upper limit of the width A such that the following relationship is established.

In the present embodiment, as described above, Asahi Glass AN is used as the glass substrate to be the TFT substrate 13 and the CF substrate 14. The thickness of this glass substrate is B = 0.7 mm (700 μm), and the refractive index is n = 1.54. Therefore, in order to satisfy the above relational expression (1), the width of the adjacent BM 14c must be A>
It is in the range of 0.326 mm.

As described above, in the liquid crystal display device 10 according to the present embodiment, the above-mentioned relational expression (1) is satisfied at the connection portion 12 between the liquid crystal panels 11a. for that reason,
The width of the adjacent BM 14c is optimized, and the refractive index adjusting material 19b
Is not transmitted through the CF 14a and reaches the display screen. Therefore, even if the refractive index of the refractive index adjusting material 19b is not substantially the same as the refractive index of the glass substrate used for the TFT substrate 13 or the like, the joint of the connection portion 12 can be made inconspicuous. As a result, a large-screen liquid crystal display device having high display quality can be obtained.

In the connection between the liquid crystal panels,
Even when the conditions such as the thickness and the refractive index of the substrate constituting the liquid crystal panel are different, the width of the adjacent BM is optimized by appropriately correcting the relational expression (1). It goes without saying that the seams can be made inconspicuous.

Second Embodiment Another embodiment of the present invention will be described below with reference to FIGS. For the sake of convenience, the same reference numerals are given to components having the same functions as those described in the first embodiment, and description thereof will be omitted.

According to the liquid crystal display device of the present invention, one of the pair of translucent substrates is a connection substrate formed by connecting a plurality of small substrates on their side surfaces. In order to prevent light transmitted through the connection portion between the small substrates from reaching the display screen, the width of the light-shielding portion existing between the pixel adjacent to the connection portion and the connection portion is optimized. ing.

The liquid crystal display device 20 of the present embodiment is similar to that of FIG.
As shown in FIG. 7, a reinforcing substrate 17 is bonded to the display surface side of a large-sized liquid crystal panel 21 with an adhesive 19a, and a polarizing plate (polarizer) 18 is provided on almost the entire surface in a direction in which the respective polarizing axes are orthogonal to each other. It has been arranged.

The liquid crystal panel 21 has one large color filter substrate (hereinafter referred to as CF substrate) 24 and an active matrix substrate (hereinafter referred to as TFT substrate) as a small substrate using TFTs as active elements. 23
a · 23a, one connection board 2 having two side faces connected to each other
3 are pasted together with a sealing material 25.

Each of the TFT substrates 23a and 23a and the CF substrate 24 are bonded together along a peripheral portion of each of the TFT substrates 23a and 23a with a sealing material 25. Therefore, the sealing material 25 is obtained by independently bonding the TFT substrates 23a and 23a to the CF substrate 24. Therefore, the liquid crystal layer 26
Is, as shown in FIG. 4, the TFT substrates 23a
It is individually clamped by the F substrate 24.

On the surface of the CF substrate 24 facing the connection substrate 23, the CF 24a and the BM (light shielding portion) 24b and the adjacent B
An M (adjacent light shield) 24c is formed. Adjacent BM2
Reference numeral 4c is formed at a position adjacent to the refractive index adjusting material 29 filled in the gap in the connection portion 22 between the TFT substrates 23a.

The TFT substrate 23a and the CF substrate 24
Basically, it has almost the same configuration as the TFT substrate 13 and the CF substrate 14 in the first embodiment, and therefore detailed description is omitted.

The liquid crystal display device 20 according to the present invention is configured such that light transmitted through the layer of the refractive index adjusting material 29 in the connection portion 22 does not reach the display screen through the CF 24a. In other words, the refractive index adjusting material 2
9 is blocked by the adjacent BM 24c. Therefore, in the adjacent BM 24c, the connection 2
It is necessary to optimize the interval between the pixel 22 adjacent to the pixel 2 (corresponding to the CF 24a in FIG. 4) and the connection portion 22. This interval is
The width from the end of the adjacent BM 24c on the side in contact with the CF 24a to the contact portion in contact with the refractive index adjusting material 29 (that is, the connecting portion 22) can be said. This width is hereinafter referred to as a light blocking width.

At this time, as shown in FIG. 5, the width of the adjacent BM 24c can be represented by 2C + P. That is, as in the first embodiment, assuming that the thickness of the layer of the refractive index adjusting member 29 is P and the light blocking width is C, the adjacent BM2
The width of 4c is 2C + P. Here, in addition to the light-shielding width C, the thickness of the TFT substrate 23a is D, and
Assuming that 3a and the refractive index of the CF substrate 24 are n, a relational expression (4) similar to the relational expression (1) in the first embodiment.
Holds.

| C |> Dtan {sin ^-1 (1 / {2n)} (4) By satisfying the relational expression (4), the liquid crystal display device according to the first embodiment is obtained. As shown in FIG. 10, the joints can be made inconspicuous even when the connecting portions 22 of the TFT substrates 23a are observed from a viewing angle of ± 45 ° left and right.

The above-mentioned relational expression (4) will be described in more detail. As shown in FIG. 5, as in the first embodiment, the relational expression (2) is established by Snell's law. At this time, the incident angle of light incident from the back surface of the liquid crystal display device 20 and the emission angle from the display surface of the liquid crystal display device 20 are θ ₁ , the transmission angle is θ ₂ , and the refractive indices of the TFT substrate 23a and the CF substrate 24 are n. And the refractive index of air is 1. Then, when the transmission angle θ ₂ is calculated so that the light emission angle θ ₁ falls within the range of ± 45 ° left and right, θ ₂ = sin ⁻¹ (1
/ √2n).

In order to make the joint of the connecting portion 22 inconspicuous when observing the liquid crystal display device 20 from an oblique direction, the light transmitted through the CF 24a is blocked by the adjacent BM 24c as in the first embodiment. . therefore,
As is clear from FIG. 5, the relational expression (5) similar to the relational expression (3) is established between the thickness D and the light-shielding width C of the TFT substrate 23a.
The light that passes through and enters the CF 24a can be blocked by the adjacent BM 24c.

C / D> tan θ ₂ (5) The CF substrate 24 is different from the TFT substrate 23a.
One substrate constituting the liquid crystal panel 21 corresponds to the entire display screen. Therefore, different from the first embodiment, the thickness of the TFT substrate 23a and the thickness of the CF substrate 24 may be different.

As described above, the relational expression (4) can be derived from the relational expressions (2) and (5). In the liquid crystal display device 20 according to the present embodiment, the above-mentioned relational expression (4) is established at the connection portion 22 between the TFT substrates 23a. Therefore, as shown in FIG. 6, the light (arrow 41 in the figure) transmitted through the refractive index adjusting material 29 is adjacent to the adjacent BM 24.
c and is hardly transmitted through the CF 24a.

Therefore, on the display screen of the liquid crystal display device 20, it is possible to prevent the color balance near the connecting portion 22 from being broken by the light transmitted through the refractive index adjusting member 29. Further, as shown in FIG. 6, the light 42 transmitted through the refractive index adjusting member 29 is also prevented from being scattered, for example, at the edge of the TFT substrate 23a. As a result, when an observer observes the display screen of the liquid crystal display device 20, the joint between the TFT substrates 23a can be made less noticeable.

The upper limit in the above relational expression (4) is the same as in the first embodiment. That is, if the width of the adjacent BM 24c is different from the width of the BM 24b, the interval (pixel pitch) between the pixels adjacent to the joint of the connection portion 22
Are not the same on the display screen, and the seams become conspicuous. Therefore, as shown in FIG.
It is preferable to set the upper limit of the width C such that the width 2C + P of the BM 24b is substantially the same as the width Q of the BM 24b in the other region.

Further, the liquid crystal display device according to the present embodiment is not limited to the above-described liquid crystal display device 20, and as shown in FIG. The liquid crystal display device 20a may have a configuration of a film substrate 23b.
The configuration of the liquid crystal display device 20a is the same as that of the liquid crystal display device except that the TFT substrate 23a is a film substrate 23b and that the reinforcing substrate 17 is bonded to the front and back surfaces of the liquid crystal panel 21a by an adhesive 19a. 20, the description is omitted.

Since the thickness of the film substrate 23b used in the liquid crystal display device 20a is about 100 μm, the thickness of the liquid crystal panel 21a can be further reduced. Further, the range in which light transmitted through the refractive index adjusting member 29 reaches the display screen can be reduced as compared with the case of the liquid crystal display device 20. for that reason,
The width of the adjacent BM 24c can be reduced. Adjacent BM
If the width of the liquid crystal display device 20c can be reduced,
The width of the BM 24b in the entire display screen a can be reduced, and the aperture ratio of the pixels can be improved. Therefore, the displayed image can be made higher definition.

As described above, in the liquid crystal display device 20 or 20a according to the present embodiment, the above-mentioned relational expression (4) is satisfied at the connection portion 22 between the TFT substrate 23a or the film substrate 23b. Therefore, the adjacent BM24c
Is optimized, so that the light transmitted through the refractive index adjusting member 29 does not reach the display screen through the CF 24a. Therefore, even if the refractive index of the refractive index adjusting member 29 is not substantially the same as the refractive index used for the TFT substrate 23a or the like, the joint of the connecting portion 22 can be made inconspicuous. As a result, a large-screen liquid crystal display device having high display quality can be obtained.

In the connection between the liquid crystal panels,
Even in the case where the conditions such as the thickness and the refractive index of the substrate constituting the liquid crystal panel are different, the width of the adjacent BM is optimized by appropriately correcting the relational expression (4). It goes without saying that the seams can be made inconspicuous.

Embodiment 3 Another embodiment of the present invention will be described below with reference to FIGS. 8 to 10. For convenience of explanation, the first embodiment is described.
Or, components having the same functions as the components described in 2 are denoted by the same reference numerals, and description thereof will be omitted.

The liquid crystal display according to the present invention is different from the liquid crystal display according to the first or second embodiment in that an adhesive spacer is further provided between a pair of substrates constituting a liquid crystal panel. It has a configuration of being arranged.

As shown in FIG. 8, the liquid crystal display device of the present embodiment is the same as the liquid crystal display device 10 of the first embodiment.
Of the TFT substrate 13 and the CF substrate 1
4 is provided with an adhesive spacer 30. Also,
As shown in FIG. 9, a spacer 30 may be provided in the liquid crystal display device 20 according to the second embodiment. The liquid crystal display device 10 and the liquid crystal display device 2
The description of the configuration of 0 is the same as that of the first and second embodiments, and will not be repeated.

The adhesive spacer 30 is formed in a non-display area on a pair of translucent substrates constituting a liquid crystal panel in the liquid crystal display device 10 or the liquid crystal display device 20.

Specifically, for example, the liquid crystal display device 10
In the case of TF, as shown in FIG.
On the T substrate 13, three CFs 14a of red (R), green (G), and blue (B) formed on a CF substrate 14 (not shown in FIG. 10) opposed to the TFT substrate 13. A plurality of pixels 6 composed of the pixel electrodes 7 corresponding to are formed.
The region between the pixels 6 is a region corresponding to the BM 14b formed on the CF substrate 14, that is, a non-display region. The non-display area does not participate in displaying an image on the liquid crystal display device 10.

Therefore, in this non-display area, for example, a plurality of spacers 30 are formed as columnar islands as shown in FIG. The spacer 30 has an adhesive property, and the TFT substrate 13 and the CF substrate 14 constituting the liquid crystal panel 11a are bonded together with the sealing material 15. By forming such a spacer 30, the structure of the liquid crystal panel 11a formed by laminating the TFT substrate 13 and the CF substrate 14 can be strengthened.

A certain space (cell) is formed between the TFT substrate 13 and the CF substrate 14 by the spacer 30 and the sealing material 15, and the cell is filled with a liquid crystal material to form a liquid crystal layer 16. Thereby, the liquid crystal panel 11a is obtained. Therefore, as described above, as shown in FIG. 8, when the structure of the liquid crystal panel 11a is strengthened, the cell gap, which is the thickness of the liquid crystal layer 16, can be maintained more uniformly.

Here, in the liquid crystal display device 10, the liquid crystal panels 11a are connected to each other by a refractive index adjusting member 19b to increase the screen size.
The relational expression (1) is established at the connection part 12 between the two. If the structure of the liquid crystal panel 11a is unstable, deformation such as a change in the cell gap of the liquid crystal layer 16 is likely to occur. In particular, if such deformation occurs near the connection portion 12, the relational expression (1) will not hold. As a result, the effect of making the joints of the connection portions 12 inconspicuous cannot be obtained, and the display quality of the liquid crystal display device 10 deteriorates.

However, if the structure of the liquid crystal panel 11a is strengthened by the spacer 30, the deformation of the liquid crystal panel 11a near the connection portion 12 is suppressed, and the joint of the connection portion 12 is not noticeable. Moreover, even if the display screen of the liquid crystal display device 10 becomes large, the cell gap of the liquid crystal layer 16 can be maintained uniformly over the entire display screen. Further, since the spacer 30 is formed in the non-display area, the spacer 3 is displayed on the display screen.
0 does not stand out. Therefore, the display quality can be further improved as compared with the related art.

In particular, in the liquid crystal display device 10 or the liquid crystal display device 20 shown in FIG. 8 or FIG.
1a or the TFT substrates 23a are connected by side surfaces having only a small area. For this reason, it is preferable to attach the reinforcing substrate 17 to at least one of the front and back surfaces of the large panel 11 and the liquid crystal panel 21 with an adhesive 19a, but the adhesive 19a may shrink as it is hardened depending on the material. The contraction of the adhesive 19a pulls the pair of substrates (the TFT substrate 13 and the CF substrate 14, or the TFT substrate 23a and the CF substrate 24) that are bonded to each other in a direction to separate them. When the substrate is pulled in this manner, the liquid crystal panel 11
a or the cell gap of the liquid crystal panel 21 is increased.

On the other hand, if the spacer 30 having the adhesive property is formed, the bonding structure between the substrates constituting the liquid crystal panel 11a or the liquid crystal panel 21 is further strengthened. It is possible to prevent a change in cell gap due to shrinkage. As a result, in the connection part 12 or the connection part 22, the relational expression (1)
Or, prevent that (4) does not hold,
The liquid crystal display device 10 or the liquid crystal display device 20 with further improved display quality can be provided.

The spacer 30 and the sealing material 1
5 may be made of the same material. For example, examples of the material used for the spacer 30 and the sealing material 15 include a resist having pressure resistance and adhesiveness. This resist can provide the spacer 30 and the sealing material 15 with adhesiveness by forming an adhesive layer on the resist even if the resist itself does not have adhesiveness.

When the spacer 30 and the sealing material 15 are made of a resist, the spacer 30 and the sealing material 15 can be formed collectively in one process using a photomask. The pattern of the spacer 30 at this time is not particularly limited as long as it fits within the area of the BM 14b and does not affect the display, but the occupied area of the spacer 30 per unit area is substantially the same. It is preferable that it is formed as follows. By forming the spacers 30 in this manner, the cell gap can be maintained more uniformly as a whole.

The pattern of the spacer 30 may be an island-shaped pattern as shown in FIG. 10, but the line width of the BM 14b must be within the area of the BM 14b.
It may be a linear pattern along 14b.

As described above, the spacer 30 and the sealing material 15
Since the spacers 30 and the sealing material 15 can be formed in one step if are made of the same material, the manufacturing process of the liquid crystal display device 10 or the liquid crystal display device 20 can be further simplified.

As shown in FIG. 10, the width of the sealing material 15 and the width of the refractive index adjusting material 19b formed at the connection portion 12 are formed to be smaller than the width of the adjacent BM 14c. Since the width of the adjacent BM 14c is preferably substantially the same as the width of the BM 14b in other areas,
It is preferable that the sealing material 15 and the refractive index adjusting material 19b formed in the connection portion 12 are formed so as to be contained in the region of the BM 14b. The configuration of the connection unit 12 is the same for the connection unit 22 in the above-described liquid crystal display device 20 and the like.

As described above, the liquid crystal display device 10 or the liquid crystal display device 20 according to the present embodiment is different from the liquid crystal display device according to the first or second embodiment in that the liquid crystal panel 11a or the liquid crystal panel In this configuration, an adhesive spacer 30 capable of adhering a pair of substrates constituting the substrate 21 is provided. Therefore, since the structure of the liquid crystal panel 11a or the liquid crystal panel 21 can be strengthened, deformation such as a change in the cell gap of the liquid crystal layer 16 does not occur near the connection portion 12 or the connection portion 22. Therefore, it is possible to prevent the relational expression (1) or the relational expression (4) from being satisfied in the connection part 12 or the connection part 22, thereby further improving the display quality of the liquid crystal display device 10 or the liquid crystal display device 20. it can.

[0079]

As described above, the liquid crystal display device according to the first aspect of the present invention is a liquid crystal display device having one large panel formed by connecting a plurality of liquid crystal panels on the side surfaces thereof. An adjacent light-shielding portion existing at a position adjacent to the connection portion among light-shielding portions formed on one surface of the substrate, where n is a refractive index of a pair of light-transmitting substrates constituting the liquid crystal panel; When the width of A is set to A and the thickness of the substrate is set to B, at the connection portion between the liquid crystal panels,
The following relational expression, | A |> Btan {sin ^-1 (1 / {2n)}, is satisfied.

Therefore, in the above configuration, the light transmitted through the connection portion is blocked by the adjacent light shielding portion,
Light transmitted through the connection does not reach the display screen. As a result, the joints of the connection portions can be made inconspicuous, so that a large-sized liquid crystal display device having high display quality can be obtained.

The liquid crystal display device according to claim 2 of the present invention
As described above, a liquid crystal panel in which at least one of a pair of translucent substrates constituting a liquid crystal panel is a single connection substrate formed by connecting a plurality of small substrates on their side surfaces. In the liquid crystal display device provided, the small substrate has a refractive index of n, and an adjacent light-shielding portion located at a position adjacent to the connection portion among light-shielding portions formed on one surface of the pair of substrates. And the width between the end portion and the contact portion that is in contact with the connection portion at a position close to the end portion is C
Further, assuming that the thickness of the small substrates is D, the following relational expression, | C |> Dtan {sin ^-1 (1 / {2n)}, is established at the connection between the small substrates. Configuration.

Therefore, in the above configuration, the light transmitted through the connection portion is blocked by the adjacent light shielding portion,
Light transmitted through the connection does not reach the display screen. As a result, the joints of the connection portions can be made inconspicuous, so that a large-sized liquid crystal display device having high display quality can be obtained.

The liquid crystal display device according to the third aspect of the present invention comprises:
As described above, in addition to the configuration described in claim 2, the small substrate is a film-shaped substrate.

Therefore, in the above configuration, the thickness of the liquid crystal panel can be made smaller than before. for that reason,
Since it is possible to further reduce the range in which the light transmitted through the connection portion reaches the display screen, it is possible to make the width of the light shielding portion smaller than before. As a result, there is an effect that the aperture ratio of the pixel is improved and the displayed image can be made higher definition.

A liquid crystal display device according to a fourth aspect of the present invention comprises:
As described above, in addition to the configuration according to the first, second, or third aspect, the pair of substrates is bonded to each other in a region to be a liquid crystal layer sealed between the pair of substrates in the liquid crystal panel. In addition, an adhesive spacer for maintaining the gap between the substrates at a constant value is formed.

Therefore, in the above configuration, since the structure of the liquid crystal panel is strengthened, the occurrence of deformation of the liquid crystal panel near the connection portion is suppressed. Therefore, the above relational expression is more accurately established at the connection portion, and the joint between the connection portions does not stand out. Moreover, the cell gap of the liquid crystal layer can be maintained uniform over the entire display screen. As a result, there is an effect that the display quality can be further improved as compared with the related art.

The liquid crystal display device according to claim 5 of the present invention is
As described above, in addition to the configuration described in claim 4, the sealing material for enclosing the liquid crystal material in the liquid crystal layer is made of the same material as the spacer.

Therefore, in the above configuration, since the spacer and the sealing material can be formed in one step, there is an effect that the manufacturing process of the liquid crystal display device can be further simplified.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram describing in more detail a configuration near a connection portion in the liquid crystal display device shown in FIG.

FIG. 3 is a schematic diagram showing a state of light incidence on the vicinity of a connection portion in the liquid crystal display device shown in FIG.

FIG. 4 is a cross-sectional view illustrating a configuration of a liquid crystal display device according to another embodiment of the present invention.

FIG. 5 is an explanatory diagram describing in more detail the configuration near a connection portion in the liquid crystal display device shown in FIG.

6 is a schematic diagram showing a state of light incidence on the vicinity of a connection portion in the liquid crystal display device shown in FIG.

FIG. 7 is a cross-sectional view showing another example of the configuration of the liquid crystal display device shown in FIG.

8 is an example of a configuration of a liquid crystal display device according to still another embodiment of the present invention, and is a cross-sectional view showing a state where spacers are formed on the liquid crystal display device shown in FIG.

9 is a cross-sectional view illustrating another example of the configuration of the liquid crystal display device illustrated in FIG. 8, in which a spacer is formed in the liquid crystal display device illustrated in FIG. 4;

10 is an explanatory diagram showing a configuration of a connection portion between liquid crystal panels in the liquid crystal display device shown in FIG.

FIG. 11 is a schematic diagram showing a state of light incidence on the vicinity of a connection portion in a conventional liquid crystal display device.

FIG. 12 is a schematic diagram showing a state of incidence of light on the vicinity of a connection portion in another conventional liquid crystal display device.

[Explanation of symbols]

 Reference Signs List 10 liquid crystal display device 11 large panel 12 connection part 13 TFT substrate (substrate) 14 CF substrate (substrate) 14a color filter 14b black matrix (light shielding part) 14c adjacent black matrix (adjacent light shielding part) 19b refractive index adjusting material 20 liquid crystal display 20a Liquid crystal display device 22 Connection portion 23 Connection substrate 23a TFT substrate (small substrate) 23b Film substrate (film-like substrate) 24 CF substrate (large substrate) 24a Color filter 24b Black matrix (light shielding portion) 24c Adjacent black matrix (adjacent light shielding) Part) 29 refractive index adjusting material 30 spacer

Claims (5)

[Claims] 1. A liquid crystal display device comprising one large panel in which a plurality of liquid crystal panels are connected at their side surfaces, wherein the refractive index of a pair of translucent substrates constituting said liquid crystal panel is determined. n, and the width of an adjacent light-shielding portion existing at a position adjacent to the connection portion among the light-shielding portions formed on one surface of the substrate is A.
Further, when the thickness of the substrate is B, the following relational expression, | A |> Btan {sin ^-1 (1 / {2n)}, is established at the connection between the liquid crystal panels. A liquid crystal display device comprising: 2. A liquid crystal panel in which at least one of a pair of translucent substrates constituting a liquid crystal panel is a single connection substrate formed by connecting a plurality of small substrates on their side surfaces. In the liquid crystal display device provided, the small substrate has a refractive index of n, and an adjacent light-shielding portion existing at a position adjacent to the connection portion among light-shielding portions formed on one surface of the pair of substrates. When the width between the end of the small substrate and the contact portion in contact with the connection portion at a position close to the end is C, and the thickness of the small substrate is D, A liquid crystal display device characterized in that the following relational expression is established at the connection section of | C |> Dtan {sin ^-1 (1 / {2n)}. 3. The liquid crystal display device according to claim 2, wherein said small substrate is a film-shaped substrate. 4. An adhesive for adhering the pair of substrates to each other in a region of the liquid crystal panel to be a liquid crystal layer sealed between the pair of substrates and maintaining a gap between the substrates at a constant value. 4. The liquid crystal display device according to claim 1, wherein said spacer is formed. 5. The liquid crystal display device according to claim 4, wherein a sealing material for enclosing the liquid crystal material in the liquid crystal layer is made of the same material as the spacer.