CN105807343A - Polarizer, production method thereof and liquid crystal display device - Google Patents

Abstract

The invention discloses a polarizer, a preparation method thereof, and a liquid crystal display device, which relate to the field of display technology and are used to avoid water ripples in images displayed by the liquid crystal display device without increasing the difficulty of the process. The polarizer includes: a first protective layer, a polarizing layer, a second protective layer and an adhesive layer stacked in sequence, wherein elastic particles capable of absorbing pressure are provided in the adhesive layer. The liquid crystal display device includes a display panel, an upper polarizer and a lower polarizer; the upper polarizer and/or the lower polarizer are the polarizers mentioned in the above technical solution. The polarizer provided by the invention is used to convert the light passing through the polarizer into linearly polarized light with a specific polarization direction.

Description

A kind of polarizer and its preparation method, liquid crystal display device

technical field

The invention relates to the field of display technology, in particular to a polarizer, a preparation method thereof, and a liquid crystal display device.

Background technique

With the continuous development of display technology, liquid crystal display devices with touch function are more and more used in people's life; this liquid crystal display device with touch function is framed or The full-fit method is used to fit the touch panel; the full-fit method refers to the seamless and complete bonding of the display module and the touch panel with water glue or optical glue, so the full-fit method is more conducive to liquid crystal display Devices are thinner and lighter, and their applications are becoming more and more extensive.

Please refer to Figure 1. When the full lamination method is used to realize the lamination of the touch panel and the display module, if the display panel in the display module is not strong in compressive strength, when the touch panel is touched, the force applied The pressure may cause the display substrate in the display panel to deform, so that the liquid crystal 1 inside the display panel corresponding to the pressure-stressed area diffuses toward the peripheral area of the pressure-stressed area, resulting in an excessive number of liquid crystals 1 in the peripheral area and disordered arrangement, so that An optical display difference occurs between the pressured area and its surrounding area, so that undesirable phenomena such as water ripples appear on the picture displayed by the liquid crystal display device. In the prior art, such water ripple phenomenon is generally alleviated by increasing the density of the main column spacer 2 inside the display panel and reducing the step difference between the main column spacer 2 and the auxiliary column spacer 3, etc., but in this way It will reduce the area occupied by the liquid crystal 1 in the display panel, and increase the difficulty of the production process of the liquid crystal display device.

Contents of the invention

The object of the present invention is to provide a polarizer, a preparation method thereof, and a liquid crystal display device, which are used to avoid water ripples in the picture displayed by the liquid crystal display device without increasing the difficulty of the process.

In order to achieve the above object, the present invention provides the following technical solutions:

The first aspect of the present invention provides a polarizer, comprising a first protective layer, a polarizing layer, a second protective layer and an adhesive layer stacked in sequence, wherein elastic particles capable of absorbing pressure are provided in the adhesive layer.

Based on the technical solution of the above polarizer, the second aspect of the present invention provides a liquid crystal display device, including a display panel, an upper polarizer and a lower polarizer, and the upper polarizer and/or the lower polarizer are the above polarizers .

Based on the above technical solution of the polarizer, the third aspect of the present invention provides a method for preparing a polarizer, the method for preparing the polarizer includes:

forming a first protective layer, a polarizing layer, and a second protective layer stacked in sequence;

An adhesive layer is superimposed on the side of the second protective layer away from the polarizing layer by a spin-coating process, and elastic particles capable of absorbing pressure are provided in the adhesive layer.

The polarizer provided by the present invention includes an adhesive layer, and the adhesive layer is provided with elastic particles capable of absorbing pressure; since the elastic particles have good elasticity, they can deform when subjected to external pressure, so when pressure is applied When on the polarizer, the elastic particles in the adhesive layer will play a certain role in buffering the pressure exerted by the outside world, that is, absorb part of the pressure; this will weaken the pressure on the display panel in the display module attached to the polarizer, thus The deformation of the display substrate in the display panel is reduced when it is under pressure; and the deformation of the display substrate is reduced, and the liquid crystal diffusion inside the display panel corresponding to the pressure area is reduced, and the liquid crystals are arranged regularly. The water ripple phenomenon in the picture displayed by the liquid crystal display device caused by the diffusion of the liquid crystal in the pressure area is avoided.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention, and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute improper limitations to the present invention. In the attached picture:

Figure 1 is a schematic diagram of the internal liquid crystal changes when the display module is under pressure in the prior art;

Fig. 2 is a schematic diagram of the change of the internal liquid crystal when the display module provided by the embodiment of the present invention is under pressure;

FIG. 3 is a schematic diagram of a first structure of a polarizer provided in an embodiment of the present invention;

Fig. 4 is a second structural schematic diagram of a polarizer provided by an embodiment of the present invention;

FIG. 5 is a schematic diagram of changes in elastic particles when the polarizer is under pressure according to an embodiment of the present invention.

Reference signs:

1- liquid crystal, 2- main columnar spacer,

3-columnar spacer, 4-array substrate,

5-Color film substrate, 6-Upper polarizer,

7-lower polarizer, 8-first protective layer,

9- polarizing layer, 10- second protective layer,

11-adhesive layer, 12-elastic particles,

13-surface protective film, 14-release film.

detailed description

In order to further illustrate the polarizer, its preparation method, and liquid crystal display device provided by the embodiments of the present invention, the embodiments of the technical solution proposed by the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the proposed technical solution, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Please refer to Fig. 2 and Fig. 4, the polarizer provided by the embodiment of the present invention includes: a polarizing layer 9 that plays a polarizing role. The first protective layer 8 and the second protective layer 10 on both sides of the layer 9, on this basis, the polarizer also includes an adhesive layer 11, and the adhesive layer 11 is superimposed on the side of the second protective layer 10 away from the polarizing layer 9, Elastic particles 12 capable of absorbing pressure are provided in the adhesive layer 11 .

Please refer to FIG. 5 , when pressure is applied to the polarizer, the elastic particles 12 in the adhesive layer 11 on the polarizer are deformed to buffer the pressure. It should be noted that the arrows in the figure represent the applied pressure.

According to the specific structure of the above-mentioned polarizer and the situation when it is under pressure, it can be known that the polarizer provided in the embodiment of the present invention includes an adhesive layer 11, and the adhesive layer 11 is provided with elastic particles 12 that can absorb pressure; due to this elasticity Particles 12 have good elasticity and can be deformed when subjected to external pressure. Therefore, when pressure is applied to the polarizer, the elastic particles 12 in the adhesive layer 11 will play a certain role in buffering the external pressure, that is, Absorb part of the pressure; in this way, the pressure on the display panel in the display module attached to the polarizer is weakened, so that the deformation of the display substrate in the display panel is reduced when it is under pressure; and the deformation of the display substrate is reduced. Correspondingly, the diffusion amount of the liquid crystal 1 inside the display panel corresponding to the pressure area is reduced, and the liquid crystals are arranged regularly, which well avoids the phenomenon of water ripples in the picture displayed by the liquid crystal display device caused by the diffusion of the liquid crystal 1 in the pressure area.

In order to ensure that the display effect of the liquid crystal display device is not affected after the above-mentioned polarizer is used, the elastic particles 12 with the same light transmittance as the light transmittance of the adhesive layer 11 can be selected, so that the elastic particles 12 are distributed in the adhesive layer 11. The light transmittance of the region and the region without elastic particles 12 is the same, which ensures the uniformity of the light transmittance of the adhesive layer 11, that is, the elastic particles 12 are arranged in the adhesive layer 11, and will not affect the polarizing effect of the polarizer. influence, thereby ensuring the display effect of the liquid crystal display device using the above-mentioned polarizer.

In addition, the mass percentage of the elastic particles 12 in the adhesive layer 11 may preferably be 50%-80%. The elastic particles 12 are distributed in the adhesive layer 11 with this mass percentage, and the distribution density is relatively high, which ensures that the elastic particles 12 can It has a good slow-release effect on pressure; and other components that play an adhesive role in the adhesive layer 11 also occupy an appropriate proportion, which can well ensure the adhesiveness of the adhesive layer 11; therefore, the elastic particle 12 is 50 The mass percentage of %-80% is distributed in the adhesive layer 11, which can not only ensure the pressure absorption of the elastic particles 12 distributed in the adhesive layer 11, but also ensure the adhesive performance of the adhesive layer 11. It should be noted that the higher the mass percentage of the elastic particles 12 in the adhesive layer 11, the stronger the compression resistance of the entire adhesive layer 11, therefore, according to actual needs, on the basis of satisfying the adhesive performance of the adhesive layer 11, appropriate Increase the proportion of elastic particles 12 in the adhesive layer 11 to achieve better compression resistance.

The kinds of elastic particles 12 mentioned in the above-mentioned embodiments are various. Preferably, the particles made of acrylic material are selected as the elastic particles 12, that is, the material of the elastic particles 12 is acrylic; since the acrylic material is soft and has good elasticity, Therefore, choosing acrylic material particles as the elastic particles 12 can effectively buffer the pressure applied by the outside, thereby well avoiding the phenomenon of water ripples in the image displayed by the liquid crystal display device due to the diffusion of the liquid crystal 1 in the pressured area. In addition, acrylic is an organic resin, and its light transmittance can be as high as 93%, which is almost the same as the light transmittance of the subsensitive adhesive (also an organic resin) used in the adhesive layer 11; therefore, the acrylic material particles are used as elastic The particles 12 are arranged in the adhesive layer 11, which will not affect the display effect of the liquid crystal display device; and acrylic also has good chemical stability and weather resistance, so adding acrylic material particles to the adhesive layer 11 will not affect the polarizer. impact on service life.

It is worth noting that the particle size of acrylic material particles is generally between 5 μm and 10 μm. Acrylic material particles with a particle size within this range can not only release pressure well, but also do not take up too much space, which is more conducive to liquid crystal display. Thinning of the device; in addition, the larger the size of the selected acrylic material particles, the more obvious the pressure release effect, the staff can choose the appropriate size of the acrylic material particles according to the actual needs, not limited to the particle size of 5μm~ 10μm acrylic particles.

In order to further improve the compression resistance of the liquid crystal display device, the thickness of the adhesive layer 11 in the above-mentioned polarizer can be thickened. Preferably, the thickness of the adhesive layer 11 is set to 5 μm to 20 μm, so that not only can the elastic particles 12 be completely located on the adhesive layer The inside of the layer 11 ensures that the surface of the adhesive layer 11 is smooth, and the thickened adhesive layer 11 has a better release effect on pressure, so that the pressure resistance of the polarizer including the adhesive layer 11 is further improved. When the polarizer with good compressive performance is used in the liquid crystal display device, the compressive capacity of the liquid crystal display device is further improved, and water ripples in the picture displayed by the liquid crystal display device are better avoided.

Of course, improving the compressive capacity of the liquid crystal display device is not limited to the above method of thickening the adhesive layer 11, the compressive capacity of the liquid crystal display device can also be improved by reducing the hardness of the adhesive layer 11, and the hardness of the adhesive layer 11 can be reduced. Reduce the modulus of elasticity of the adhesive layer 11; preferably, the modulus of elasticity of the adhesive layer 11 is set to 5kPa～20kPa, and the modulus of elasticity of the adhesive layer 11 between 5kPa～20kPa is prone to deformation when subjected to pressure. The adhesive layer 11 has a better cushioning effect on pressure, that is, the ability of the adhesive layer 11 to absorb pressure is improved, so that the polarizer including the adhesive layer 11 has better pressure resistance. When the polarizer with good compressive performance is used in the liquid crystal display device, the compressive capacity of the liquid crystal display device is further improved, and water ripples in the picture displayed by the liquid crystal display device are better avoided.

Please refer to Fig. 3, in the process of practical application of the polarizer provided by the above-mentioned embodiment, its first protective layer 8 is easily damaged by the outside world, such as causing pollution or scratches, etc., in order to prevent the first protective layer 8 from being damaged, A surface protective film 13 can be superimposed on the first protective layer 8. This surface protective film 13 can protect the first protective layer 8, that is, reduce the degree of external damage to the polarizer and prolong the use of the polarizer. life. Optionally, the material of the surface protection film 13 can be made of silicon dioxide to form a glass surface protection film 13. This glass surface protection film 13 can not only effectively protect the first protection layer 8, but also not Affect the viewing effect of the liquid crystal 1 liquid crystal display device.

It is worth noting that after forming the adhesive layer 11 in the polarizer and before attaching the polarizer to the display panel, it is necessary to attach the adhesive layer 11 (the surface attached to the display panel on the adhesive layer 11 ) for protection; therefore, a release film 14 can be superimposed on the adhesive layer 11, and this release film 14 can not only protect the adhesive layer 11, but also can be easily separated from the adhesive layer 11; When attaching the polarizer to the display panel, the release film 14 can be easily torn off from the adhesive layer 11 for subsequent attaching work.

Please continue to refer to FIG. 2, an embodiment of the present invention also provides a liquid crystal display device, including a display panel, an upper polarizer 6 and a lower polarizer 7, wherein the upper polarizer 6 and/or the lower polarizer 7 are provided for the above-mentioned embodiments polarizers.

Specifically, the display panel in the liquid crystal display device is composed of an array substrate 4, a color filter substrate 5, and a liquid crystal layer located between the array substrate 4 and the color filter substrate 5; the upper polarizer 6 in the liquid crystal display device is attached to the display On the display surface of the panel, that is, on the color filter substrate 5 , the lower polarizer 7 is attached on the surface of the display panel opposite to the display surface, that is, on the array substrate 4 . When the liquid crystal display device displays images, light passes through the lower polarizer 7 , the display panel and the upper polarizer 6 in sequence, thereby completing the image display.

Since the liquid crystal display device provided in this embodiment uses the polarizer provided in the above embodiment, and the adhesive layer 11 of the above polarizer is provided with elastic particles 12 capable of absorbing pressure; since the elastic particles 12 have good elasticity, It can be deformed when subjected to external pressure. Therefore, when pressure is applied to the polarizer, the elastic particles 12 in the adhesive layer 11 will have a certain buffering effect on the pressure applied by the outside, that is, absorb part of the pressure; The pressure on the display panel in the display module where the polarizer is attached is weakened, so that the deformation of the display substrate in the display panel is reduced when it is under pressure; and the deformation of the display substrate is reduced, corresponding to the pressure area. The diffusion amount of the liquid crystal 1 inside the display panel is reduced, and the phenomenon of water ripples in the picture displayed by the liquid crystal display device caused by the diffusion of the liquid crystal 1 in the pressure-receiving area is well avoided.

It should be noted that the upper polarizer 6 and the lower polarizer 7 used in the liquid crystal display device can all adopt the polarizers provided by the above-mentioned embodiments, so that the upper polarizer 6 and the lower polarizer 7 can all play a role in the pressure received. Sustained release function, that is, it can maximize the pressure resistance of the entire display module. Of course, only the upper polarizer 6 or only the lower polarizer 7 may be the polarizer provided in the above embodiment, as long as it can ensure that the image displayed by the liquid crystal display device does not have water ripples.

The embodiment of the present invention also provides a preparation method of a polarizer, the preparation method comprising:

Forming a first protective layer 8, a polarizing layer 9 and a second protective layer 10 stacked in sequence;

An adhesive layer 11 is superimposed on the side of the second protective layer 10 away from the polarizing layer 9 by a spin-coating process, and elastic particles 12 capable of absorbing pressure are provided in the adhesive layer 11 .

In the preparation method of the polarizer provided in this embodiment, an adhesive layer 11 is superimposed on the side of the second protective layer 10 away from the polarizing layer 9, and the adhesive layer 11 is provided with elastic particles 12 capable of absorbing pressure; therefore, when When pressure is applied on the polarizer, the elastic particles 12 in the adhesive layer 11 will play a certain buffering effect on the pressure exerted by the outside world, that is, the pressure resistance of the adhesive layer 11 is well improved; The pressure on the display panel in the combined display module is weakened, so that the deformation of the display substrate in the display panel is reduced when it is under pressure; and the deformation of the display substrate is reduced, and the corresponding inside of the display panel corresponding to the pressure area The diffusion amount of the liquid crystal 1 is reduced, and the phenomenon of water ripples in the picture displayed by the liquid crystal display device caused by the diffusion of the liquid crystal 1 in the compressed area is well avoided.

Further, in order to protect the first protective layer 8 in the polarizer, the above-mentioned preparation method of the polarizer also includes: using a spraying process to form a surface protective film 13 on the side of the first protective layer 8 away from the polarizing layer 9 by a spraying process, the surface protection The material of the membrane 13 is silicon dioxide.

In the above scheme, the material (silicon dioxide) forming the surface protective film 13 is evenly coated on the first protective layer 8 by a spraying process, so that the formed glass surface protective film can fully protect the first protective layer 8 protection, so as to prevent the first protective layer 8 from being polluted or scratched by the outside world, that is, the service life of the polarizer is well extended while ensuring the normal use of the polarizer.

Furthermore, in order to protect the adhesive layer 11 in the polarizer, a release film can be pasted on the side of the adhesive layer 11 away from the second protective layer 10. This release film 14 can not only protect the adhesive layer 11 In this way, when attaching the polarizer to the display panel, the release film 14 can be easily peeled off from the adhesive layer 11 for subsequent attachment work.

In order to more clearly illustrate the preparation process of the polarizer provided in the above embodiments, a specific example of the preparation process of the polarizer is given below.

Embodiment one:

Step S1: Form the first protective layer 8, the polarizing layer 9 and the second protective layer 10 stacked in sequence; wherein, the polarizing layer 9 can be formed by using conventional materials such as polyvinyl alcohol, and the polarizing layer 9 is used to direct the light passing through it Converted to linearly polarized light in a specific polarization direction, that is, to play a polarizing role; both the first protective layer 8 and the second protective layer 10 can be formed of materials such as triacetate cellulose, and are used to protect the polarizing layer 9 to prevent the polarizing layer 9 from rupture;

Step S2: Coating silicon dioxide on the side of the first protective layer 8 away from the polarizing layer 9 by using a spraying process;

Step S3: Coating the adhesive layer material on the side of the second protective layer 10 away from the polarizing layer 9 by using a spin coating process to form the adhesive layer 11; the adhesive layer material is a mixture of acrylic material particles and subsensitive adhesive, the adhesive layer 11 is used to bond the polarizer and the display panel together, and the formed adhesive layer 11 has strong compression resistance;

Step S4: Paste the release film 14 on the side of the adhesive layer 11 away from the second protective layer 10; complete the preparation of the polarizer.

In the description of the above embodiments, specific features, materials or characteristics may be combined in any one or more embodiments or examples in an appropriate manner.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (9)

1. a polaroid, including being sequentially overlapped the first protective layer of setting, polarizing layer, the second protective layer and adhesion coating, it is characterised in that be provided with the elastic particle of absorption pressure in described adhesion coating.

2. polaroid according to claim 1, it is characterised in that the light penetration of described elastic particle is identical with the light penetration of described adhesion coating.

3. polaroid according to claim 1, it is characterised in that described elastic particle mass percent in described adhesion coating is 50%-80%.

4. the polaroid according to any one of claim 1-3, it is characterised in that the material of described elastic particle is acrylic.

5. polaroid according to claim 4, it is characterised in that the particle diameter of described elastic particle is 5 μm～10 μm.

6. the polaroid according to any one of claim 5, it is characterised in that the thickness of described adhesion coating is 5 μm～20 μm.

7. the polaroid according to any one of claim 1-3, it is characterised in that the elastic modelling quantity of described adhesion coating is 5kPa～20kPa.

8. a liquid crystal indicator, including display floater, upper polaroid and lower polaroid, it is characterised in that described upper polaroid and/or described lower polaroid are the polaroid according to any one of claim 1-7.

9. the preparation method of a polaroid, it is characterised in that the preparation method of described polaroid includes:

Formed be sequentially overlapped the first protective layer, polarizing layer, the second protective layer；

Adopt spin coating proceeding to form adhesion coating at described second protective layer away from superposition on the side of described polarizing layer, described adhesion coating is provided with the elastic particle of absorption pressure.