JPH11287978A - Manufacture of liquid crystal display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture the liquid crystal display panel of excellent quality without cap irregularity or display irregularity and driving voltage irregularity due to them even at the time of a large-sized panel by performing a process of sealing an injection port between substrates and the process of irradiating a substrate surface with light, etc., at a temperature at which a display medium material holds an isotropic state. SOLUTION: The display medium material 5 is sealed between the substrates 1 and 2 provided with electrodes 3 and 4 and a sealing agent 6 is provided on the injection port. The sealing agent 6 is irradiated from a light source 7 through a filter 8 for interrupting the light matched with the light adsorption characteristics of a photopolymerization initiating agent inside the display medium material and the sealing agent 6 is hardened. In the injection process of the display medium material 5, the temperature at which the display medium material 5 becomes the isotropic state and workability during the injection process are taken into consideration and the display medium material 5, the inside of an injector chamber and an empty liquid crystal display panel are held at 30 deg.C of about 5 deg.C higher than a phase transition point. Then, finally, the material 5 is irradiated with the ultraviolet rays from which the ultraviolet rays of a harmful wavelength area are cut and the liquid crystal display panel is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a polymer-dispersed liquid crystal display panel in which a liquid crystal material and a polymer are mixed.

[0002]

2. Description of the Related Art A liquid crystal display panel having an advantage of being light, thin and small is an excellent display element to be mounted on various products. In recent years, the development of reflective liquid crystal display panels has been actively pursued in pursuit of low power consumption and thinning, and among them, polymer dispersed liquid crystal display panels have been attracting attention because they can obtain extremely bright display surfaces. .

In a polymer dispersed liquid crystal display panel, a display medium material containing a liquid crystal material, a photopolymerizable polymer, a photopolymerization initiator, and the like is placed between a substrate having a pair of upper and lower electrodes. Inject at a constant temperature to maintain, and irradiate the substrate surface with light, generally ultraviolet light, that matches the light absorption characteristics of the photopolymerization initiator at a constant temperature at which they also maintain an isotropic state. It is manufactured by dispersing and fixing a liquid crystal material and a polymer to the substrate. Since the dispersion state of the liquid crystal material and the polymer is fixed by ultraviolet rays, external light to the substrate is generally blocked during manufacturing. In addition, the reason why the liquid crystal material and the polymer are kept at a constant temperature during the production is to uniformly disperse the liquid crystal material and the polymer in the substrate.

The display mode of the polymer-dispersed liquid crystal display panel manufactured as described above is generally called a scattering mode, and the scattering state and the transmission state are controlled by the presence or absence of an electric field. The basic display principle is as follows. First, when no voltage is applied, the liquid crystal material exists in a random direction in the substrate, and a difference occurs between the refractive index of the liquid crystal material and that of the polymer. As a result, light incident on the substrate is scattered at the liquid crystal material-polymer interface (scattered state). On the other hand, when a voltage is applied, since the molecular axes of the liquid crystal material are aligned in the direction of the electric field, the refractive indices of the liquid crystal material and the polymer substantially match, and light incident on the substrate is transmitted through the substrate (transmission state).

From the above basic principle, the polymer-dispersed liquid crystal display panel does not require an alignment process, unlike the TN liquid crystal utilizing the optical rotation of light and the STN liquid crystal utilizing the birefringence of liquid crystal molecules. Since no plate is required, a bright display surface can be obtained. In addition, in the scattering state, the light incident on the substrate is diffused while being scattered in the substrate, so that the influence of the uneven gap on the scattering state is small, and therefore, the strictness of the gap accuracy is not so required.

[0006]

As described above, since the polymer dispersion type liquid crystal display panel does not require much strictness in gap accuracy, it is suitable for a liquid crystal display panel of medium / small size, low duty, or static drive. Does not have a problem even if the step of equalizing the gap between the substrates, that is, the step of applying the pressure from the outside of the substrate to equalize the gap between the substrates (generally, the pressing process) is not performed. However, when the pressing process is not performed, the gap difference between the center and the end of the panel increases as the size of the panel increases. In particular, when duty driving is performed on a large panel, the driving voltage unevenness due to the gap unevenness increases, and the driving margin decreases as the duty number increases. As a result, display unevenness easily occurs. Although the gap unevenness can be solved by performing the pressing process, a problem also occurs in the subsequent sealing step of the injection port.

That is, in the production of a general liquid crystal panel, a light-curing type sealing agent is applied to an injection port and its vicinity after a pressing process in a liquid crystal display panel. In this state, the press pressure is slightly reduced to draw an appropriate amount of the sealing agent into the injection port, and then the sealing agent is fixed by irradiating light suitable for the light absorbing characteristics of the sealing agent. As the sealant used here, an ultraviolet curable type is often selected from the viewpoint of reliability and handleability. On the other hand, the light absorption characteristics of the photopolymerization initiator of the polymer-dispersed liquid crystal are generally in the ultraviolet region. For this reason, if the injection port and the vicinity thereof are sealed after the press treatment by the above method, strong ultraviolet rays will be incident from the injection port before the light irradiation step for dispersing and fixing the liquid crystal material and the polymer, It is unavoidable that the dispersion and fixation of the liquid crystal material and the polymer in the substrate due to this progress. In addition, when the dispersion and fixation of the liquid crystal material and polymer begin in the substrate due to the incident light, that part is in a “scattered state”, so that the incident light is scattered and diffused in the substrate, and hence the substrate. Dispersion and immobilization of the liquid crystal material and the polymer proceed relatively deep into the substrate and with gradation. The substrate in such a state has no commercial value in terms of display quality.

[0008]

In order to solve such problems, the present invention provides a method for manufacturing a liquid crystal display panel having the following steps. That is, a step of injecting a display medium material containing a liquid crystal material, a photopolymerizable polymer, and a photopolymerization initiator between a pair of substrates, and a photocuring type sealing having an absorption characteristic in a wavelength region different from that of the photopolymerization initiator. Liquid crystal display panel, wherein the step of sealing the injection port with an agent and the step of irradiating the substrate surface with light that matches the light absorption characteristics of the photopolymerization initiator are performed at a temperature at which the display medium material maintains an isotropic state. Manufacturing method.

Before the sealing step, a step of pressing both surfaces of the substrate to uniform the gap between the substrates (press processing step) may be provided. Specifically, after the injection step, after performing a press processing step to achieve a uniform gap between the substrates, a light-curable sealing agent having an absorption characteristic in a wavelength region different from the photopolymerization initiator is injected into the injection port and the injection port. It is a step of applying the light to the vicinity, applying a suitable amount of the light-curing sealing agent into the injection port by slightly lowering the pressing pressure, and irradiating light suitable for the light absorption characteristics of the light-curing sealing agent. At this time, since a photopolymerization initiator having a property different from the light absorption property in the display medium material is used as the photocurable sealant, light corresponding to the light absorption property of the photocurable sealant is irradiated. Even so, light suitable for the light absorption characteristics of the photopolymerization initiator is not incident on the substrate, so that dispersion and fixation of the liquid crystal material and the polymer can be reduced. Further, if the light source is provided with a cut filter that blocks light that matches the light absorption characteristics of the photopolymerization initiator in the display medium material, the dispersion and immobilization of the liquid crystal material and the polymer can be reliably suppressed.

[0010] Alternatively, a photo-curing type sealing agent having an absorption characteristic in the wavelength region of the absorption characteristic of the photopolymerization initiator is disposed at the injection port and in the vicinity thereof, and a light suitable for the absorption characteristic of the photopolymerization initiator is provided on the substrate. To cure the photocurable sealant and simultaneously disperse and fix the liquid crystal material and the photopolymerizable polymer. Specifically, after performing a pressing process as a process for equalizing the gap between the substrates, an appropriate amount of a photocurable sealing agent having an absorption characteristic substantially equal to that of the photopolymerization initiator is applied to the injection port and the vicinity thereof. In a state where the press pressure is slightly lowered and an appropriate amount of the photo-curing type sealing agent is drawn into the injection port (in a state where a slight pressure is applied), the substrate surface is irradiated with light matching the light absorption characteristics of the photopolymerization initiator. Process. In this case, since the pressing process to the light irradiation process can be performed consistently, extra handling of the panel between the processes is not required, and the workability is very good.

Further, a sealant disposed at an injection port between the substrates includes
Has light absorption characteristics almost equal to the light absorption characteristics of the photopolymerization initiator,
By using a photocurable sealant having a viscosity of 40,000 cp or more, the pressing pressure can be released before the sealant is cured. Since the photocurable sealant used here has a high viscosity, the uniformity of the gap between the substrates is maintained for a while even if the pressing pressure is released after applying the sealant to the injection port and the vicinity thereof. Therefore, even if any stress is applied to the panel while handling the panel between processes, the uniformity of the gap between the substrates is not affected. Further, since the dispersion and fixation of the liquid crystal material and the polymer in the substrate and the curing of the sealant can be performed by one light irradiation, the workability is good.

Further, after a press treatment step is performed to make the gap between the substrates uniform, an appropriate amount of a sealing agent which cures in a short time is applied to the injection port and the vicinity thereof, and after the sealing agent is cured, a pressing pressure is applied. May be solved. In this case, since light is not required for curing the sealant, there is no need to consider an increase in equipment such as providing a light source for curing the sealant in the manufacturing process,
A very simple liquid crystal panel can be manufactured.

[0013]

Embodiments of the present invention will be specifically described below. (Embodiment 1) FIG. 1 is a schematic view showing a sealing step in Embodiment 1. A display medium material 5 is sealed between substrates 1 and 2 provided with electrodes 3 and 4, respectively, and a sealant 6 is provided at an injection port. The sealant is irradiated from a light source 7 through a filter 8 that blocks light that matches the light absorption characteristics of the photopolymerization initiator in the display medium material, and the sealant is cured.
Here, the press processing spacer 9a is provided on the liquid crystal display panel.
, A pressing pressure is applied by the support for press processing 10a.

The manufacturing process of the liquid crystal display panel will be described. Transparent glass substrates were used as the upper and lower substrates 1 and 2, and electrodes were formed on one surface of each. The upper electrode 3 on the observer side needs to be a transparent electrode, and the lower electrode 4 may be a reflective electrode when used as a reflective liquid crystal display panel. Here, the upper and lower electrodes were both transparent electrodes made of ITO, and were formed on the substrate by sputtering and then patterned by photolithography. The upper and lower substrates are bonded together with a bead-shaped spacer (not shown) facing the electrode side,
An empty liquid crystal display panel was manufactured.

Next, the step of injecting the display medium material will be described.
As the display medium material 5, "PNM-1" manufactured by Rodick Co., Ltd., in which a photopolymerization initiator having an ultraviolet absorption property is mixed.
56 "was used. This is a kind of polymer dispersed liquid crystal,
A polymer network liquid crystal having advantages such as low voltage driving and high scattering intensity is called. The injection is performed using a vacuum injection method, taking into consideration the temperature at which the display medium material 5 is brought into an isotropic state (about 25 ° C. in the above-mentioned material; this temperature is hereinafter referred to as a phase transition point) and the workability during the injection step. , Display medium material 5, in the injector chamber, and empty liquid crystal display panel,
The test was performed while maintaining the temperature at 30 ° C. higher than the phase transition point by about 5 ° C.
After this, until the irradiation of the liquid crystal display panel with ultraviolet rays is completed, in order to prevent the polymer from starting to cure during the production,
As external light (for example, a fluorescent lamp), a light whose ultraviolet rays were blocked was used.

Next, the pressing and sealing steps shown in FIG. 1 will be described. When the display medium material 5 used is irradiated with ultraviolet light at a temperature generally higher than the phase transition point by 1 to 2 ° C., a liquid crystal display panel having a high scattering intensity can be obtained. Therefore, the external atmosphere in the pressing and sealing steps was set to about 27 ° C. In the pressing process, a plurality of liquid crystal display panels 11 (only one of the plurality of liquid crystal display panels is shown in FIG. 1) are overlapped with a spacer 9a interposed therebetween, and the whole of them is
a (only one of the pair is shown in FIG. 1),
This was performed by applying pressure to the support 10a. Specifically, a smooth SUS plate is used for the support 10a so that a uniform pressure can be applied to the liquid crystal display panel 11, and a pressure of 0.3 kg / square cm is applied from above the support 10a.
Pressure was applied for about 0 minutes. After that, 420 n as the sealant 6
A sealing agent (Luxtrak LCR0242D) manufactured by Toa Gosei Kagaku having an absorption characteristic at m to 450 nm is applied to the injection port of the liquid crystal display panel and the vicinity thereof, and the press pressure is returned to 0.2 kg / cm 2 for 5 minutes. After leaving the sealant to the inside of the injection port for about 30 minutes, light irradiation was performed toward the sealant 6 for 30 seconds. The light source 7 used at this time was 300
This is a light source for irradiating visible light that can provide an output of about 0 mJ / square cm. Since the spectrum of the light source 7 may include ultraviolet rays, an ultraviolet cut filter 8 is disposed in front of the light source 7. After the sealing step was completed, the pressing pressure was completely released, and the display surface of the liquid crystal display panel was confirmed. However, dispersion and immobilization of the liquid crystal material and the polymer near the injection port did not occur.

Finally, the liquid crystal display panel was irradiated with ultraviolet rays in which ultraviolet rays in a wavelength range harmful to the liquid crystal material were cut, thereby completing the liquid crystal display panel. The liquid crystal display panel manufactured in this way had no scattering intensity unevenness in the panel plane, and the driving voltage was equal at the center and the end of the panel even when driven. Here, in the sealing step, if a light source that does not include light having the wavelength of the light absorption characteristic of the photopolymerization initiator in the display medium material is used as the light source, the ultraviolet cut filter 8 is not disposed on the front of the light source. The same configuration can be realized by performing light irradiation. That is, there is no scattering intensity unevenness in the panel surface, and the driving voltage is equal at the center and at the end of the panel even when driven.

(Embodiment 2) FIG. 2 is a schematic view showing a pressing step, a sealing step, and a light irradiation step in this embodiment 2. The second embodiment is the same as the first embodiment up to the injection step in the process of manufacturing the liquid crystal display panel. Therefore, the description up to the injection step is omitted. Also, the members forming the liquid crystal display panel are the same except for the sealant, and the same applies to temperature control during manufacture and shielding of external light.

In the jig used in the press processing in FIG. 2, 9a and 9b are both press processing spacers, and particularly 9b is made of a transparent material that transmits ultraviolet rays. Also, reference numerals 10a and 10b denote supports for press processing, and particularly, 10b is made of a transparent material that transmits ultraviolet light. Light source 7 is transparent 10b, 9
It shall be arranged on the side with b.

After the injection step, the pressing is performed by using a transparent pressing support 10b and a transparent pressing spacer 9b.
b, liquid crystal display panel 11, spacer 9a for press processing,
This was carried out by superposing the supports for press processing 10a in this order, and applying a pressure of 0.3 kg / square cm between the supports for press processing 10a and 10b for 10 minutes. After that, a suitable amount of a sealing agent (Photolec 704) manufactured by Sekisui Chemical Co., Ltd. having an absorption characteristic in the ultraviolet region as the sealing agent 6 is applied to the injection port and the vicinity thereof, and the press pressure is returned to 0.2 kg / square cm. After leaving the sealant in the injection port for about 5 minutes, the liquid crystal display panel 11 is irradiated with ultraviolet rays from the light source 7 (while the liquid crystal display panel 11 is in a pressurized state), and the sealant and the polymer are simultaneously After curing, a liquid crystal display panel was completed.

In the liquid crystal display panel manufactured as described above, the gap between the substrates was extremely uniform, the scattering intensity was not uniform in the panel surface, and the driving voltage was equal at the center and the end of the panel even when driven. In the manufacturing process,
The sealing process, the light irradiation process,
In addition, since the three types of processes were performed consistently, there was no extra handling of panels, and the workability was very good.

(Embodiment 3) Embodiment 3 is the same as Embodiment 1 up to the injection step in the manufacturing process of the liquid crystal display panel. Therefore, the description up to the injection step is omitted. Others
The members forming the liquid crystal display panel are the same except for the sealant, and the same applies to temperature control during manufacture and shielding of external light.

After the injection step, the press processing is performed by superposing a plurality of injected liquid crystal display panels with a press processing spacer therebetween, sandwiching the whole of the liquid crystal display panels with a pair of press processing supports, The test was performed by applying a pressure of 0.2 kg / cm 2 for about 10 minutes. Then, as a sealant, it has light absorption characteristics in the ultraviolet region,
A three-bond sealant (ThreeBond 3054) having a viscosity of about p was used and applied to the injection port of the liquid crystal display panel and the vicinity thereof. Here, the viscosity of the sealant may be selected in consideration of the shape of the inlet of the liquid crystal display panel, the gap, and the like. Incidentally, if a low-viscosity sealant is used, the sealant may be drawn too much into the inlet. Also,
If any stress is applied to the panel during handling from the sealing step to the ultraviolet irradiation step, gap unevenness is likely to occur as the sealing agent has a lower viscosity.

After applying the sealant, completely release the press pressure,
We quickly entered the final step of irradiating the ultraviolet light and completed the liquid crystal display panel. The liquid crystal display panel manufactured in this manner has no scattering intensity unevenness in the panel plane,
In addition, the amount of the sealing agent drawn into the injection port was also appropriate, and there was no problem in appearance. Even if you try to drive further,
The drive voltage was almost equal at the center and the end of the panel. Further, in the light irradiation, the workability was good because the dispersion and fixation of the liquid crystal material and the polymer in the substrate and the curing of the sealing agent could be performed by one light irradiation.

(Embodiment 4) Embodiment 4 is the same as Embodiment 1 up to the injection step in the process of manufacturing the liquid crystal display panel. Therefore, the description up to the injection step is omitted. Others
The members forming the liquid crystal display panel are the same except for the sealant, and the same applies to temperature control during manufacture and shielding of external light.

After the injection step, the press processing is performed by superposing a plurality of injected liquid crystal display panels with a press processing spacer interposed therebetween, and sandwiching the whole of the liquid crystal display panels with a pair of press processing supports. This was performed by applying a pressure of 0.3 kg / cm 2 for about 10 minutes. Then, the sealant 6
Apply an appropriate amount of an epoxy-based sealant that cures in a short time to the injection port and its vicinity, and then apply a press pressure of 0.2 k
g / square cm, and the sealing agent was drawn into the inlet and cured at the same time. After the sealant was cured, the pressing pressure was released, and the ultraviolet irradiation step as the final step was performed to complete the liquid crystal display panel.

The liquid crystal display panel manufactured in this way had no scattering intensity unevenness in the panel plane and had no problem in appearance. Even if you try to drive further,
The drive voltage was almost equal at the center and the end of the panel. In addition, in the sealing step, since light is not required for curing the sealant,
There was no need to consider an increase in equipment such as providing a light source for curing the sealant in the manufacturing process, and the liquid crystal panel could be manufactured extremely simply.

[0028]

As described above, according to the present invention, a method of manufacturing a polymer-dispersed liquid crystal display panel in which a liquid crystal material and a polymer are mixed is described by using at least one liquid crystal material and a light between a pair of transparent substrates. A step of injecting a display medium material containing a polymerizable polymer and a photopolymerization initiator, a step of pressing both sides of the substrate to uniform the gap between the substrates (press processing step),
The step of sealing the injection port between the substrates and the step of irradiating the substrate surface with light that matches the light absorption characteristics of the photopolymerization initiator, excluding ultraviolet rays harmful to the liquid crystal material, maintain the display medium material in an isotropic state. Since the method of manufacturing a liquid crystal display panel was performed at a temperature, even in the manufacture of a large panel, a high quality liquid crystal display panel could be manufactured without gap nonuniformity, display nonuniformity, and drive voltage nonuniformity.

Further, the step of sealing the injection port between the substrates includes:
After performing a pressing process as a process to equalize the gap between the substrates, apply a photo-curing sealant to the injection port and its vicinity, slightly reduce the pressure on both sides of the substrate, and apply an appropriate amount of photo-curing in the injection port. The step of drawing in the mold sealant and irradiating light that matches the light absorption characteristics of the photocurable sealant may be performed. In particular, the photocurable sealant includes a photopolymerization initiator in the display medium material and light absorption properties. In particular, by using a light source with a cut filter that blocks light that matches the light absorption characteristics of the photopolymerization initiator in the display medium material, the light source matches the light absorption characteristics of the photopolymerization initiator. It was possible to suppress the incidence of the incident light into the substrate and the dispersion and fixation of the liquid crystal material and polymer in the vicinity of the injection port, thereby producing a stable product and improving the yield.

In the step of sealing the injection port between the substrates and the step of irradiating the substrate surface with light suitable for the light absorption characteristics of the photopolymerization initiator, press processing is performed as a step of making the gap between the substrates uniform. After that, apply an appropriate amount of a photo-curing sealant with light absorption characteristics almost equal to that of the photopolymerization initiator to the injection port and its vicinity. In a state where the stopping agent is drawn in (in a state where a slight pressure is applied), the substrate surface may be irradiated with light that matches the light absorption characteristics of the photopolymerization initiator. In this case, from the pressing to the light irradiation step Since the process can be performed consistently, extra handling of the panel between processes is not required, and the workability is very good.

Further, the step of sealing the injection port between the substrates includes:
After performing a press process as a process of equalizing the gap between the substrates, a light-curing sealant having a light absorption characteristic substantially equal to that of the photopolymerization initiator and having a viscosity of 40,000 cp or more is injected into the injection port and its vicinity. And the process of releasing the press pressure may be performed. In this case, the uniformity of the inter-substrate gap is maintained for a while even after the press pressure is released because the photocurable sealant has a high viscosity. Therefore, even if any stress is applied to the panel while handling the panel between processes, there is no effect on the uniformity of the gap between the substrates. In addition, dispersion and immobilization of liquid crystal material and polymer in the substrate,
In addition, since the curing of the sealing agent could be performed by one light irradiation, the workability was good from the viewpoint of light irradiation.

Further, the step of sealing the injection port between the substrates includes:
After performing a press process as a process of uniforming the gap between the substrates, a suitable amount of a sealing agent that cures in a short time is applied to the injection port and the vicinity thereof, and the pressing pressure may be released after the curing of the sealing agent. In this case, since light is not required for curing the sealant, there is no need to consider an increase in equipment such as providing a light source for curing the sealant in the manufacturing process, and the liquid crystal panel can be manufactured extremely simply. Was.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a sealing step after a press processing step in the first embodiment.

FIG. 2 is a schematic view showing a pressing step, a sealing step, and a light irradiation step in Example 2.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 upper substrate 2 lower substrate 3 upper electrode 4 lower electrode 5 display medium material 6 sealant 7 light source 8 filter for blocking light that matches the light absorption characteristics of photopolymerization initiator 9a press spacer 9b press spacer (transparent 10a Support for press processing 10b Support for press processing (transparent) 11 Liquid crystal display panel

Continuation of the front page (72) Inventor Shunichi Monobukuro 1-8-8 Nakase, Mihama-ku, Chiba-shi Inside Seiko Instruments Inc. (72) Inventor Takakazu Fukuchi 1-8-8 Nakase, Nakase-Mihama-ku, Chiba-shi Seiko In Instruments Co., Ltd. (72) Inventor Hiroshi Sakuma 1-8-1, Nakase, Mihama-ku, Chiba-shi, Seiko Instruments Inc. (72) Inventor Osamu Yamazaki 1-8-8 Nakase, Mihama-ku, Chiba-shi, Chiba Seiko Instruments Inc. Within the Company (72) Inventor Masafumi Hoshino 1-8-8 Nakase, Mihama-ku, Chiba-shi, Chiba Seiko Instruments Inc. (72) Inventor Naoshi Shino 1-8-8 Nakase, Mihama-ku, Chiba-shi, Chiba Seiko Instruments Inc. (72) Inventor Shuhei Yamamoto 1-8-1 Nakase, Mihama-ku, Chiba City, Chiba Pref.

Claims (8)

[Claims] 1. A method for manufacturing a liquid crystal display panel in which a liquid crystal material and a polymer are mixed in a gap between a pair of substrates at least one of which is transparent, comprising a liquid crystal material, a photopolymerizable polymer, and a photopolymerization initiator. An injection step of injecting the display medium material into the gap from an injection port at a constant temperature at which the display medium material maintains an isotropic state; and at the constant temperature, the injection port is different from the photopolymerization initiator. A sealing step of sealing with a photocurable sealing agent having an absorption property in a wavelength region, and a step of irradiating a transparent substrate surface with light that matches the absorption property of the photopolymerization initiator under the constant temperature, A method for manufacturing a liquid crystal display panel, comprising: 2. The method according to claim 1, wherein the sealing step includes applying the photo-curing sealant to the injection port and the vicinity thereof while applying a pressing pressure for equalizing the gap on both surfaces of the substrate. By lowering the pressure, the light-curable sealant is drawn into the inlet, and the light-curable sealant is cured by irradiating light that matches the light absorption characteristics of the light-curable sealant. The method for manufacturing a liquid crystal display panel according to claim 1, wherein: 3. A light source that irradiates light having a light absorption characteristic of the photocurable sealing agent from a light source through a cut filter that blocks light having a wavelength of the light absorption characteristic of the photopolymerization initiator. The method for manufacturing a liquid crystal display panel according to claim 2. 4. A method for manufacturing a liquid crystal display panel in which a liquid crystal material and a polymer are mixed in a gap between a pair of substrates at least one of which is transparent, comprising a liquid crystal material, a photopolymerizable polymer, and a photopolymerization initiator. A first step of injecting the display medium material into the gap from an inlet under a constant temperature where the display medium material keeps an isotropic state, and the light absorption characteristics of the photopolymerization initiator in the inlet and in the vicinity thereof. A light-curing sealant having light-absorbing properties in a wavelength region is arranged, and the substrate is irradiated with light that matches the light-absorbing properties of the photopolymerization initiator to cure the light-curable sealant and the liquid crystal. A method for manufacturing a liquid crystal display panel, comprising: a second step of dispersing and fixing a material and the photopolymerizable polymer. 5. The method according to claim 4, wherein the second step is performed while applying a pressing pressure to both surfaces of the substrate through transparent pressing supports. 6. A photo-curable encapsulation having a light absorption characteristic substantially equal to the light absorption characteristic of the photopolymerization initiator while applying a pressing pressure to both surfaces of the substrate via a transparent pressing support in the second step. The agent is arranged in the vicinity of the injection port and the vicinity thereof, and then, the light corresponding to the light absorption characteristics of the photopolymerization initiator is applied to the substrate surface in a state where the photocuring sealant is drawn into the injection port by lowering the press pressure. The method of manufacturing a liquid crystal display panel according to claim 5, wherein the irradiation is performed. 7. The second step has a light absorption characteristic substantially equal to that of the photopolymerization initiator and a viscosity of 40,000 cp while applying a pressing pressure to both surfaces of the substrate via a pressing support. A step of arranging the photocurable sealant at the injection port and the vicinity thereof, a step of releasing the press pressure, and a step of irradiating the substrate surface with light that matches the light absorption characteristics of the photopolymerization initiator, The method for manufacturing a liquid crystal display panel according to claim 4, comprising: 8. A method for manufacturing a liquid crystal display panel in which a liquid crystal material and a polymer are mixed in a gap between a pair of substrates at least one of which is transparent, comprising a liquid crystal material, a photopolymerizable polymer, and a photopolymerization initiator. A step of injecting the display medium material into the gap from an injection port at a constant temperature at which the display medium material maintains an isotropic state; Disposing a sealant that cures over time in the injection port and its vicinity, releasing the press pressure after the sealant has cured, and irradiating the substrate surface with light that matches the light absorption characteristics of the photopolymerization initiator And a method for manufacturing a liquid crystal display panel.