JPH10170922A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the display defect, which occurs near the injection port of a liquid crystal display device. SOLUTION: This liquid crystal display device has a pair of oriented films 6 which exist in a display region 3 and are arranged to face each other via liquid crystals in order to orient the liquid crystals injected from the injection port 4. The plane shape of at least one oriented film 6 is so formed that ionic impurities may be captured at a projecting part by providing the film with a projecting part 12 made of polyimide projecting toward the injection port 4 from the display region 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a liquid crystal display device, and more particularly to improvement of alignment failure of an injection port.

[0002]

2. Description of the Related Art In general, a liquid crystal display device sandwiches a liquid crystal by using a polymer film called an alignment film in order to align the liquid crystal in a certain direction. FIG. 10 is a plan view showing a main part of a conventional liquid crystal display device. As shown in FIG. 10, in the liquid crystal display device, a main seal 2 made of resin is formed around an insulating substrate 1 so as to surround a display area 3.

An injection port 4 is provided at a position where the main seal 2 is interrupted. After the liquid crystal is spread from the injection port to the inner peripheral portion of the main seal 2, an end seal 5 made of resin prevents the liquid crystal from contacting the outside air. Seal. The shape of the alignment film 6 is square or rectangular so as to cover the entire display area 3 irrespective of the type and shape of a resin (main seal) for bonding two substrates such as glass called a main seal. I have.

FIG. 11 is a cross-sectional view of a portion from a filling port to a display area of a conventional liquid crystal display device. As shown in FIG. 11, an end seal 5 is formed at an end of the substrate 1, while polycrystalline Si7 for transmitting an external voltage to a display electrode is deposited at the center of the substrate 1 corresponding to a display area.

The surface of the polycrystalline Si 7 is covered with an oxide film 8 in order to generate an electric field effect on the polycrystalline Si 7 from a scanning line. The oxide film 8 and the substrate 1 are covered with an interlayer insulating film 9 made of BPSG to separate a scanning line and a signal line, which are wirings in a display area. In addition, Al 10 serving as a signal line is connected to polycrystalline Si 7 through a hole penetrating oxide film 8 and interlayer insulating film 9.

As shown in FIG. 11, since Al10 is relatively thick, a flattening layer 11 made of SOG is formed on the Al10 and the interlayer insulating film 9 up to below the end seal 5. Further, an alignment film 6 made of polyimide is formed on the flattening layer 11 to a position slightly beyond a display region where the polycrystalline Si 7 exists.

[0007]

Among such liquid crystal display devices having an injection port for injecting liquid crystal, there is a problem that ionic impurities enter the liquid crystal display device from the injection port during liquid crystal injection. is there. The infiltrated ionic impurities are sequentially captured by the alignment film exposed on the surface, so that the ion density particularly on the alignment film near the injection port is increased.

[0008] As a result, the voltage holding ratio of the liquid crystal is lowered, and there is a problem that a display failure occurs in a pixel near the injection port. FIG. 12 is a distribution diagram of the voltage holding ratio on the liquid crystal display device, showing a state of a drop in the voltage holding ratio occurring in the alignment film 6 after 820 hours from the injection of the liquid crystal in FIG.

[0009] The voltage holding ratio is a numerical value indicating the percentage of the voltage drop at 60 Hz, that is, 1/60 = 16.7 ms while rewriting one screen, as a percentage. When the voltage holding ratio is low, in other words, when the resistance of the liquid crystal is low, the sharpness of the liquid crystal display device is lost. In addition, when the voltage holding ratio is partially low, a mottled pattern is generated on the screen, and the display becomes unsightly.

[0010] As shown in FIG.
The voltage holding ratio is 88% and 90% or less at the temperature of 30 ° C. in the region of the third row, the second column, and the third row, the third column. Conventionally, as means for avoiding these, there has been a configuration in which an SiO2 alignment film from the injection port to the display region is extended in a corridor shape, and ionic impurities are adsorbed on the inorganic insulating film by enlarging a liquid crystal introduction portion ( JP-A-58-115417).

However, in this configuration, since the liquid crystal is injected through a long and narrow corridor, there is a concern that the injection time of the liquid crystal display device becomes long. In addition, the publication discloses a configuration in which an irregular structure made of a seal resin (a columnar structure when it reaches the counter electrode substrate) is formed by applying a spot-like application near the injection port when applying the main seal resin. .

However, in this configuration, a failure that the injection port is blocked occurs, and the main seal resin itself can also be a source of contamination. As a result, display failure due to elution of impurities from the seal closer to the display area into the liquid crystal occurs. There is a fear that it will occur. The present invention has been made to solve such a problem, and an object of the present invention is to provide a liquid crystal display device capable of performing a uniform display on the entire screen.

[0013]

According to a first aspect of the present invention, there is provided a liquid crystal display device comprising: a pair of liquid crystal display devices disposed in a display area, the liquid crystal display devices being arranged to face each other with a liquid crystal interposed therebetween so as to orient the liquid crystal injected from an injection port. In a liquid crystal display device having a film, at least one of the alignment films has a projecting portion projecting from the display region toward the injection port.

According to a second aspect of the present invention, in the liquid crystal display device, the alignment film is separated into a display region and a projection. According to a third aspect of the present invention, in the liquid crystal display device, the protrusion is made of polyimide. Further, in the liquid crystal display device according to the fourth aspect, the surface of the protruding portion is formed in an uneven shape.

According to a fifth aspect of the present invention, in the liquid crystal display device, the surface of the protrusion is formed in an uneven shape by the shape of the lower layer of the protrusion, and the lower layer of the protrusion is formed of the same material as the wiring in the display area. Is what is being done. That is, as described above, in addition to the conventional alignment film shape (square or rectangular), an organic polymer film is newly formed in a projecting or island shape toward the injection port.

It is desirable that these shapes are square, rectangular, or circular as large as possible, and that they do not get caught on the main seal. In this way, the ionic impurities that enter can be captured by the organic polymer projecting portion before reaching the display region. In addition, if an alignment film is applied on a single or a plurality of concavo-convex structures, the surface area from the injection port to the display area becomes larger, and the protrusions act as obstacles for diffusion of ionic impurities. I do.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Here, in order to confirm in advance what kind of display failure occurs near the injection port, a 3 ″ liquid crystal display device having a polyimide alignment film on the entire surface is used. It was investigated how the voltage holding ratio changes with the elapsed time depending on the distance from the entrance.

FIG. 9 is a distribution diagram of the voltage holding ratio showing a state of display failure near the injection port when liquid crystal is injected from the corner of the 3 ″ liquid crystal display device. In FIG. Each area of the square of the matrix of 5 rows and 5 columns has a length of 3 mm on each side and a distance of 1 mm between the areas.
Have the following intervals. Note that the temperature was 60
A sealed liquid crystal display device was placed under environmental conditions of 90 ° C. and 90% humidity.

As shown in FIG. 9A, the voltage holding ratio hardly decreases 110 hours after the injection (110H). Also, as shown in FIG. 9b, after 490 hours, the voltage holding ratio near the injection port at a temperature of 30 ° C. has dropped to 88%. Further, as shown in FIG. 9c, after 820 hours, the voltage holding ratio at a temperature of 30 ° C. in the lower left area near the injection port is 83%.
Down to

However, as shown in FIG. 9D, after 980 hours, the distribution of the voltage holding ratio at a temperature of 30 ° C. after 820 hours has not changed. From the results shown in FIG. 9, it is found that the ionic impurities penetrating into the flat liquid crystal display device have a temperature of 60.degree.
At 0%, it was found that diffusion was limited to a limited distance from the inlet. This phenomenon is presumed to be because the ionic impurities are captured on the alignment film, and thereafter are continuously captured without being diffused under the above conditions.

(First Embodiment) In view of these results, a liquid crystal display according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a plan view showing a main part of the liquid crystal display device of the first embodiment in which an alignment film protrudes from a display region toward an injection port.

On a substrate 1 made of insulating transparent glass or the like, a two-part epoxy resin main seal 2 composed of a main agent and a curing agent is formed so as to surround the substrate 1. The display area 3 located inside the main seal 2 and at the center of the substrate 1 receives signals from outside by two kinds of wirings, ie, scanning lines made of WSi2 and signal lines made of Al.

The conduction or cutoff of a thin film transistor (TFT) at a specific position is controlled by a scanning signal on a scanning line, and the voltage of a display electrode is rewritten at a frequency of 60 Hz by a video signal on a signal line. Near the intersection of the scanning line and the signal line, a polycrystalline Si T
FT is formed.

The ends of the scanning lines and signal lines receive signals from external circuits outside the main seal. Since the signal line made of Al is as thick as several μm, it is flattened by SOG and then ITO
Is connected to the TFT. The distance between the opposing substrate (not shown) and the substrate is 4 μm to 12 μm.

In such a liquid crystal display device, the alignment film 6
It is formed in a shape that not only covers the display area 3 but also forms a protrusion 12 that projects from the rectangular display area 3 to the injection port 4. Further, as described with reference to FIG. 9 described above, the diffusion distance from the injection port in which ionic impurities that can cause display defects are present is 10 mm or less, so that the distance between the main seal 2 and the end seal 5 is small. , The length of the protruding portion 12 in the direction of the injection port was designed to be 10 mm.

The alignment film 6 is a low-temperature curable polyimide film formed at 120 ° C. to 180 ° C., and is classified into two types, a main chain type and a side chain type, depending on the position where the imide group exists. When the same polyimide is used for the display region and the protrusion extending in the direction of the injection port, when different materials are used, a transition line generated between the two does not enter the display region and the display is not divided.

Polyimide is used as a solvent for adjusting the viscosity of N.
MP (N-methylpyrrolidone), monobutyl ether as an additive for smoothing, etc. are added, printed on the substrate 1, cured, and rubbed. The rubbing conditions were as follows: 400 r. p. m. The alignment film was rubbed while being rotated.

The protrusion 12 made of polyimide in FIG. 1 is formed in a rectangular shape and is designed so as not to reach the main seal 2. This is because when the alignment film 6 is formed below the main seal 2, the main seal 2 made of epoxy resin is formed.
This is because the adhesion between the film and the alignment film 6 becomes weak, and a problem occurs in reliability.

A new 10 mm projection is formed with a substrate spacing of 4 μm.
, The voltage holding ratio of the display area near the injection port became 96% or more at a temperature of 30 ° C. even after an acceleration test of 820 hours. Here, the voltage holding ratio usually decreases as the temperature increases, but even at 70 ° C., in the case of the present embodiment, a voltage holding ratio of 94% can be obtained.

The protrusion 12 may be not only the rectangle shown in FIG. 1, but also a polygon. (Second Embodiment) For example, FIG. 2 is a plan view showing a main part of a liquid crystal display device of a second embodiment in which a trapezoidal projection is provided on an alignment film. As shown in FIG. 2, the protrusion 12 is set to have the same width as that of FIG. 1 on the side of the injection port 4 and to be wider than that of FIG. 1 on the side of the rectangular display area 3.

This embodiment is useful when the injection port is small and ionic impurities are concerned about diffusion in the lateral direction. For a liquid crystal display device with an inlet width of 6 mm, the inlet side is 4 m
m, the display area side is set to 12 mm, and the depth is set to 10 mm. By providing the projection 12, the voltage holding ratio at a temperature of 30 ° C. of the display area close to the injection port is 96% after 820 hours.
That is all.

In the first and second embodiments, the display area and the protruding portion are connected, but they need not necessarily be connected. Third Embodiment A liquid crystal display device according to a third embodiment in which a protruding portion is separated from a display area will be described with reference to FIG.

FIG. 3 is a plan view showing a main part of the liquid crystal display device according to the third embodiment. As shown in FIG.
An alignment film 6 made of polyimide having a width slightly exceeding the display region 3 and an island-shaped polyimide protrusion 12 extending from the display region 3 to the injection port 4 are formed by printing. ing. If the alignment film is formed apart from the display area and the protruding portion, the hydrophobicity of the film underlying the alignment film is high, and even when the polyimide solution after printing is easily repelled,
Compared to the case where the display area and the projection are formed together,
The protrusion is less likely to be deformed, and the pattern accuracy is improved.

For example, when the SOG formed from the organic silicon compound is the lower layer of the alignment film, the SOG may be a starting material containing a large amount of aromatic components, or a case where the proportion of Si—O terminated with an organic substance is large. In addition to the fact that the voltage holding ratio at a temperature of 30 ° C. becomes 96% or more, the dimensional change of the alignment film after printing and after rubbing falls within 5%, and the area of the projection portion sufficient to capture ionic impurities is reduced. Can be secured.

Although the surface of the polyimide alignment film is smooth and the surface of the protrusion made of polyimide is also smooth, the surface of the protrusion is not necessarily required to be flat. (Fourth Embodiment) A liquid crystal display device according to a fourth embodiment having uneven projections will be described with reference to FIGS.

FIG. 4 is a plan view showing a main part of a liquid crystal display device according to the fourth embodiment. As shown in FIG.
The polyimide alignment film 6 covering the upper display region 3 has a polyimide protrusion 12 protruding toward the injection port 4 side. In addition, irregularities made of Al10 are provided in a direction perpendicular to the direction in which the projecting portion 12 connects the injection port 4.

Al in the layer under the protrusion 12 made of polyimide
Reference numeral 10 is formed by the same material at the same time as the signal line 13 penetrating the display area 3 by photolithography and etching. As described above, when the signal line 13 is formed of the same material, the ionic impurities do not diffuse from the lower layer of the protrusion to the protrusion 12 made of polyimide.

If the projections and depressions are formed by photolithography at the same time as the signal lines, the projections and depressions can be formed when the signal lines are processed, and the voltage holding ratio at a temperature of 30 ° C. can be increased without increasing the number of steps. Is 96% or more, so that poor alignment is eliminated. In FIG. 4, three pieces of Al 10 are formed in a rectangular shape having a larger width than the protrusion 12 made of polyimide.

FIG. 4 omits an opposing substrate as in the previous figures, and also omits an end seal for explanation.
FIG. 5 is a cross-sectional view of the liquid crystal display taken along the line VV in FIG. In FIG. 5, the left side is the display area side, and the right side is the injection port side. As shown in FIG. 5, a quartz glass substrate 1
Polycrystalline Si7 having a mobility of 120 cm 2 / Vs or more and subjected to hydrogen annealing at 450 ° C. is formed to a thickness of 1000 °.

A 1000.degree.-thick SiO.sub.2 on polycrystalline Si7
An oxide film 8 made of two is formed as a gate oxide film of the TFT. After depositing BPSG (boron, phosphorus silicate glass) on the oxide film 8 and the substrate 1, an interlayer insulating film 9 having a thickness of 5000 mm formed by flowing by heating is laminated.
The Al 10 on the polycrystalline Si 7 operates as a signal line, but through a contact hole formed in the oxide film 8 and the interlayer insulating film 9 to transmit a video signal to the TFT.
It is electrically connected to polycrystalline Si7.

Al2 having a thickness of 2 μm is deposited on the interlayer insulating film by sputtering, and its length and width are 4 mm and 1 mm, respectively. The left display area is thick A
In order to eliminate the step of 1, it is covered with a flattening layer 11 made of SOG (Spin-On-Glass), which is a kind of silicon resin obtained by applying and curing an organosiloxane oligomer liquid.

The 2 μm-thick planarizing layer having a relative dielectric constant of 2.9 on the way from the left side to the right side of FIG. 5 is removed at the same time as exposing the ends of the signal lines. On the interlayer insulating film 9 that has appeared on the surface due to the removal of the planarization layer 11, strip-shaped Al2 having a thickness of 2 μm and containing almost no ionic impurities is formed simultaneously with the signal lines.

The polyimide alignment film 6 extends from the top of the flattening layer 11 on the left side corresponding to the display area, over the three Al10 peaks interspersed between the valleys without the flattening layer, and at the injection port. Is formed by printing with a thickness of at least about 500 ° to 4000 ° thinner than at least Al10 in the valley up to the upper surface of the flattening layer 11 on the right side. By forming an alignment film thinner than the underlying protrusions, the alignment film faithfully reflects the unevenness of the base to form 2 μm unevenness, thereby increasing the surface area for capturing ionic impurities.

By this, for example, the length of the protruding portion is set to 5
Even if it is shortened to mm, poor alignment will be reduced. Alignment film 6
End seal 5 on flattening layer 11 at the right end of substrate 1
Are formed, and serve to bond the opposing substrate (not shown) to the substrate 1. Alternatively, when forming a peripheral circuit or a contact hole of a TFT on a substrate, unevenness may be formed in a layer below the protruding portion.

If the projection does not protrude toward the liquid crystal as shown in FIG. 5, the flow of the liquid crystal is not blocked, so that the time required for injecting the liquid crystal is shortened. FIG. 5 illustrates strip-shaped protrusions, but the layer located under the alignment film is larger than the unevenness of less than 1 nm at a depth formed by rubbing.
The polygon may be a visible polygon, or may be an uneven surface formed by etching or the like.

(Fifth Embodiment) FIG. 6 is a plan view of a liquid crystal display device in which a lower layer having irregularities is formed in an arrowhead-shaped polygon. As shown in FIG. 6, an alignment film 6 covering the display area 3 of the substrate 1 extends to the injection port 4 to form a protrusion 12.

The layer below the protrusion 12 is an arrowhead-shaped MoW 14 having six sides. MoW14 is Mo 70
This is a layer having a thickness of 0.2 μm and containing almost no ionic impurities formed at the same time as the scanning line 15 having a specific resistance of 15 μm or less, in which the atomic% and the W are 30 atomic%. Since it is formed of a high melting point metal, the MoW 14 does not deform even when the interlayer insulating film is reflowed.

MoW 14 is an interlayer insulating film made of BPSG,
Since the flattening layer made of SOG is used as the upper layer, it acts as a weir for the liquid crystal, and suppresses the phenomenon that occurs when the liquid crystal is rapidly injected and the direction of alignment changes in the inflow direction of the liquid crystal. The arrowhead-shaped MoW 14 has a narrow width at the center and wide at both ends. Further, the MoW 14 collects the flow of the liquid crystal, which tends to spread from the injection port to the left and right, at the center of the protrusion from the shape of the arrowhead, so that the ionic impurities are easily trapped by the polyimide of the protrusion 12.

Alternatively, the layer below the alignment film may be a laminated film of the scanning lines and the signal lines, and the height of the projections may be made larger to serve as a weir for the flow of the liquid crystal. As a result, the MoW protrusion acts as an obstacle to the diffusion of the ionic impurities, and the voltage holding ratio at a temperature of 30 ° C. becomes 96% or more. As shown in FIG. 6, when the interlayer insulating film and the flattening layer are overlapped on the protrusion, the injection time is slightly longer, but is extremely shorter than the conventional corridor-like injection port configuration.

Since the longitudinal direction of the convex portion in FIG. 6 is in the same direction as the wiring, the arrangement of the scanning line for supplying the scanning signal to the display area is not restricted at all. In FIG. 6, the injection port is arranged on the lower left side and the convex portion is arranged so as to be aligned with the scanning line. However, the same effect can be obtained even if the injection port is arranged on the left side and the convex portion is arranged so as to be aligned with the signal line. 4 or 6, the surface area of the alignment film is increased by the same material as the wiring for supplying an external signal to the display region. Unevenness may be formed in the layer.

(Sixth Embodiment) FIG. 7 is a plan view of a liquid crystal display device in which unevenness is formed in a layer below an alignment film by etching before printing the alignment film. In FIG. 7, the main seal 2 is shown to make it easy to see where the irregularities are formed.

As shown in FIG. 7, an uneven portion 16 roughened by etching is formed in an area of 10 mm × 10 mm from the display area 3 to the injection port 4. For example, S
Since the planarization layer made of OG is easily etched by O2 plasma, the high frequency power is 30 W and the plasma excitation frequency is 10
An uneven portion 16 having a surface roughness of 0.2 μm at 0 MHz is formed.

It is preferable to assist-etch the flattening layer with plasma or the like in a vacuum, since water and ions adsorbed on the flattening layer can be removed while leaving fine undulations.
Further, when the flattening layer near the injection port is irradiated with an electron beam at an accelerating voltage of 100 V in O2, uneven portions 16 having a surface roughness of 0.3 μm are selectively formed. When etching is performed using an electron beam, it is possible to form a groove of an arbitrary shape by selecting a place in the planarization layer by scanning with the beam.

By forming a thin protrusion on the uneven portion, unevenness is formed on the surface of the protrusion. According to the configuration of FIG. 7, a pattern such as a fine undulation or a Bezier curve is formed as an unevenness under the alignment film. As shown in FIG.
The display area 3 is divided into 3 rows and 9 columns, with the lower side as the X axis and the tangent to the main seal 2 on the left side of the injection port as the Y axis.

FIG. 8 is a plan view of a liquid crystal display device showing how the voltage holding ratio is distributed depending on the positional relationship between the divided display area and the injection port in all the embodiments. As shown in FIG. 8, the voltage holding ratio in the region of the third row, the first column, the third row, the second column, and the third row, the third column close to the injection port is 88% of the conventional value even after 820 hours under the accelerated test. In comparison, in the present embodiment, the temperature is increased to 96% at a temperature of 30 ° C.

Then, the voltage holding ratio of the white portion is
It becomes 97% at a temperature of 30 ° C., and the difference from the voltage holding ratio with the vicinity of the injection port is only about 1%. Therefore, the expression of 260,000 colors (= 64 × 64 × 64) expressed by 64 gradations of three primary colors. 1/64 = 1.56% or less, which is necessary for the liquid crystal display device. Further, according to the present invention, the voltage holding ratio at a temperature of 20 ° C. is 98% or more even in the display region near the injection port.

As described above, in the liquid crystal display device of the present invention, there is almost no decrease in the voltage holding ratio in the display area near the injection port, and local display defects are eliminated. Therefore, in a liquid crystal display device in which liquid crystal is injected, uniform display is performed on the entire screen. In the above embodiments, the active matrix type liquid crystal display device has been described. However, a simple matrix type liquid crystal display device can be easily implemented.

For example, a transparent glass paste is printed on the layer below the alignment film at room temperature and dried at 150 ° C. for 15 minutes.
After baking at 580 ° C. for 15 minutes to form a dielectric layer having a thickness of 1 to 2 μm, assist etching is performed in the vicinity of the injection port.
Further, as the alignment film, an organic polymer such as polyurethane having a thickness of 50 nm, which is obtained by printing a polyurethane oligomer diluted to 4% by weight with γ-butyrolactone and then polymerizing it, may be used.

Furthermore, although only the configuration of the alignment film on one substrate has been described, it is also possible to provide a projection on the alignment film on the other substrate.

[0060]

According to the present invention, since the planar shape of at least one of the alignment films protrudes from the display region toward the injection port, the ionic impurities are formed on the protruding portion before reaching the display region from the injection port. Since it is adsorbed and does not diffuse to the display area, it can be displayed vividly as a whole. Further, since the alignment film is separated into the display region and the protrusion, the protrusion is less likely to be repelled by surface tension, and a sufficient area for adsorbing ionic impurities can be secured.

Further, since both the display area and the protruding portion are made of polyimide, no transition line is generated and the display can be made uniform. In addition, since the surface of the protrusion is formed in an uneven shape, ionic impurities can be captured by the surface enlarged by the unevenness without increasing the linear distance from the injection port to the display area.

Further, the surface of the projection is formed unevenly by the shape of the lower layer of the projection, and the lower layer of the projection is formed of the same material as the wiring such as the scanning line or the signal line in the display area. Therefore, the unevenness can be formed below the protruding portion without increasing the number of steps.

[Brief description of the drawings]

FIG. 1 is a plan view of a liquid crystal display device according to a first embodiment.

FIG. 2 is a plan view of a liquid crystal display device according to a second embodiment.

FIG. 3 is a plan view of a liquid crystal display device according to a third embodiment.

FIG. 4 is a plan view of a liquid crystal display device according to a fourth embodiment.

FIG. 5 is a sectional view of a liquid crystal display device according to a fourth embodiment.

FIG. 6 is a plan view of a liquid crystal display device according to a fifth embodiment.

FIG. 7 is a plan view of a liquid crystal display device according to a sixth embodiment.

FIG. 8 is a distribution diagram of a voltage holding ratio in a display area according to the embodiment.

FIG. 9 is a graph showing a change over time in a voltage holding ratio in a display area.

FIG. 10 is a plan view of a conventional liquid crystal display device.

FIG. 11 is a sectional view of a conventional liquid crystal display device.

FIG. 12 is a distribution diagram of a voltage holding ratio in a display region in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 2 Main seal 3 Display area 4 Injection port 5 End seal 6 Alignment film 7 Polycrystalline Si 8 Oxide film 9 Interlayer insulating film 10 Al 11 Flattening layer 12 Projecting part 13 Signal line 14 MoW 15 Scanning line 16 Uneven part

Claims (5)

[Claims] 1. A liquid crystal display device having a pair of alignment films disposed in a display region and opposed to each other with a liquid crystal interposed therebetween for aligning liquid crystal injected from an injection port. A liquid crystal display device, wherein the film has a protrusion protruding from the display area toward the injection port. 2. The liquid crystal display device according to claim 1, wherein the projection is separated from the display area. 3. The liquid crystal display device according to claim 1, wherein the projection is made of polyimide. 4. The liquid crystal display device according to claim 1, wherein the surface of the projection is formed in an uneven shape. 5. The projection according to claim 1, wherein the surface of the projection is formed in an uneven shape by the shape of the lower layer of the projection, and the lower layer of the projection is formed of the same material as the wiring in the display area. The liquid crystal display device according to claim 1.