KR20170067032A - 2d/3d switchable filter with low driving voltage - Google Patents

Abstract

The present invention relates to a 2D / 3D conversion filter used in a display that can be viewed by converting 2D / 3D into spectacles without glasses. Since the 2D / 3D conversion filter includes a conductive polymer in the lenticular lens layer, 2D / 3D conversion is possible even at low driving voltage of 12V or less even if the distance between electrode layers increases.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a 2D / 3D conversion filter having a low driving voltage,

More particularly, the present invention relates to a 2D / 3D conversion filter that can be easily applied to a display having a low driving voltage. [0002] The present invention relates to a 2D / 3D conversion filter used in a display capable of 2D / .

In recent 3D display fields, an autostereoscopic display capable of viewing 3D images without additional glasses has been developed to solve the inconvenience of using accessories such as conventional 3D glasses. However, since most 2D image contents are mainly used up to now, it is required that a 2D image is also implemented in a non-eyeglass type 3D display.

In a non-eyeglass type 3D display, a lenticular lens is generally used to generate a refractive index difference for separating light reaching both eyes. A liquid crystal capable of controlling the refractive index is introduced to the 3D display, and 2D / 3D conversion is possible Lenticular lenses have been developed (U.S. Patent No. 6,069,650).

The principle of the 2D / 3D conversion lenticular lens is as follows. In the 2D mode, the refractive index of the liquid crystal is the same as the refractive index of the lenticular lens layer, and thus serves as a transparent layer which passes the 2D image from the display panel without refraction In the 3D mode, the refractive index of the liquid crystal differs from the refractive index of the lenticular lens layer, so that the 2D image from the display panel can serve as a lens to refract light so that the 3D image is seen as a 3D image. For this purpose, a liquid crystal exhibiting a normal light refractive index and an extraordinary light refractive index due to an optical anisotropy and a polarization property is used according to voltage application.

Such a lenticular lens and a non-spectacle 2D / 3D conversion method using a liquid crystal have a lower manufacturing cost than other methods, and there is no problem such as a decrease in luminance, so that introduction into a monitor or a TV has become active. Particularly, the 2D / 3D conversion filter manufactured by providing the lenticular lens and the liquid crystal between the two driving electrodes can exhibit the 2D / 3D conversion function by a simple method of attaching the 2D / 3D conversion filter to the front surface of the general display.

However, in a liquid crystal cell applied to a general display, the distance between the upper and lower electrode layers is within a few micrometers, so that a driving voltage of usually 12 V or less is used. In the 2D / 3D conversion filter, The driving voltage required for the 2D / 3D conversion rises to 15V or more, and the additional voltage supply device must be installed in the display having the lenticular lens layer according to the thickness of the lenticular lens layer. There is a problem.

U.S. Patent No. 6,069,650 (May 30, 2000)

Therefore, an object of the present invention is to provide a 2D / 3D conversion filter which can be driven even at a low voltage of 12 V or less, which is used in a typical liquid crystal cell.

According to the above object, the present invention provides a liquid crystal display device comprising a first transparent substrate layer, a first transparent electrode layer, a lenticular lens layer, a liquid crystal layer, an orientation film layer, a second transparent electrode layer, A 2D / 3D conversion filter, wherein the lenticular lens layer includes a conductive polymer.

The present invention also provides a spectacles 2D / 3D conversion display comprising a display panel and the 2D / 3D conversion filter disposed on the front surface of the display panel.

The 2D / 3D conversion filter includes a conductive polymer in the lenticular lens layer, and 2D / 3D conversion is possible even at a driving voltage of 12 V or less even though the distance between the electrode layers is distant due to the existence of the lenticular lens layer and the liquid crystal layer. The driving voltage can be kept constant regardless of the change of the distance between the upper and lower electrode layers according to the thickness variation of the lenticular lens layer.

1 is a cross-sectional view showing the structure of a 2D / 3D conversion filter according to an example of the present invention.
2 is a cross-sectional view illustrating the structure of a 2D / 3D conversion display according to an example of the present invention.

Hereinafter, the present invention will be described more specifically with reference to the accompanying drawings. In order to facilitate understanding, the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

1, a 2D / 3D conversion filter 100 according to the present invention includes a first transparent substrate layer 111, a first transparent electrode layer 121, a lenticular lens layer 130, a liquid crystal layer 150, The second transparent electrode layer 122, and the second transparent substrate layer 112 in this order, wherein the lenticular lens layer 130 includes a conductive polymer .

The constituent layers include an upper plate including a first transparent substrate layer 111, a first transparent electrode layer 121 and a lenticular lens layer 130, and an orientation film layer 140 when the liquid crystal layer 150 is divided. A second transparent electrode layer 122, and a second transparent substrate layer 112. The first transparent electrode layer 122 and the second transparent substrate layer 112 are formed of a transparent substrate.

Hereinafter, the constituent layers will be described in detail.

The transparent substrate layer is formed of a first transparent substrate layer 111 and a second transparent substrate layer 112 on the upper and lower substrates and supports the transparent electrode layers 121 and 122 and the like.

The transparent substrate layer may be a transparent polymer film or a glass substrate, preferably a transparent polymer film.

Specific examples of the transparent polymer film include polyether sulfone (PES), polyacrylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyphenylene sulfide ), A polyallylate, a polyimide, a polycarbonate (PC), a cellulose triacetate (TAC), a cellulose acetate propionate (CAP), and mixtures thereof . Of these, a film comprising a polymer selected from the group consisting of PET, PC, TAC, PAR, and mixtures thereof is preferable.

The transparent base layer preferably has a transmittance of 90% or more of light incident from the rear surface, and it is preferable that the flatness of the surface is uniform so as not to cause a luminance deviation.

The thickness of the transparent base layer may be 50 to 250 占 퐉, preferably 70 to 210 占 퐉, and more preferably 100 to 188 占 퐉. The thickness of the transparent base layer can be adjusted according to the resolution, pixel size, viewing distance, 3D depth, etc. required for the display device. When the thickness of the transparent base layer is 50 탆 or more, a proper 3D depth sense or stereoscopic effect can be exhibited. When the thickness is 250 탆 or less, lightweight thinning of the non-spectacle stereoscopic image display device can be achieved.

The first transparent substrate layer and the second transparent substrate layer may be the same or different from each other in terms of a raw material, a refractive index, a transmittance, a thickness, and the like.

The transparent electrode layer is provided as a first transparent electrode layer 121 and a second transparent electrode layer 122 on the transparent substrate layers 111 and 112 of the upper and lower substrates to control the alignment of the liquid crystal molecules.

The transparent electrode layer may include a general transparent conductive material, for example, indium tin oxide (ITO). In this case, a transparent electrode layer can be formed by sputtering indium tin oxide (ITO) on the surface of the transparent base layer.

Alternatively, the transparent electrode layer may be formed by mixing a conductive material with an organic binder, an organic solvent, a silane coupling agent, and a silicone surfactant to prepare a conductive coating liquid, and then applying and solidifying the conductive coating liquid onto the transparent substrate layer. The conductive coating liquid may be applied to a transparent substrate layer using spray coating, spin coating, roll-to-roll coating, or bar coating methods and then heated to form a transparent electrode layer having a dry thickness of 0.1 to 0.5 탆.

The transparent electrode layer may have a thickness of 0.1 to 0.5 탆, a refractive index of 1.42 to 1.60, a surface resistance of 100 to 1,000 Ω / □, and a transmittance of 80 to 92%, but may vary depending on the composition or use.

The first transparent electrode layer and the second transparent electrode layer may be the same or different from each other in terms of a raw material, a refractive index, a transmittance, a thickness, and the like.

The lenticular lens layer 130 is provided on the first transparent electrode layer 121 of the upper plate.

The lenticular lens layer 130 is configured to contact the liquid crystal layer 150 formed of a liquid crystal material. Accordingly, the lenticular lens layer functions as a lens for refracting light according to the arrangement of the liquid crystal material.

The lenticular lens layer includes a conductive polymer.

For example, the conductive polymer may include a polythiophene resin, and more specifically, poly (3,4-ethylenedioxythiophene) (PEDOT) doped with poly (4-styrenesulfonate) , But is not limited thereto.

The conductive polymer may be contained in an amount of 5 to 50% by weight based on the weight of the lenticular lens layer.

The lenticular lens layer may further include a binder resin.

The binder resin may be a thermosetting resin and a UV curing resin which are conventionally used for the lenticular lens layer. For example, an acrylic resin, a urethane resin, an epoxy resin, a vinyl resin, a polyester resin, a polyamide resin, have.

More specific examples of the binder resin include (meth) acrylate resin, unsaturated polyester resin, polyester (meth) acrylate resin, silicone urethane (meth) acrylate resin, silicone polyester (meth) Urethane (meth) acrylate resins, and mixtures thereof.

Preferably, an acrylic resin capable of realizing excellent coating properties, mechanical properties, adhesive strength, durability, and the like can be used. Specifically, an acrylic resin such as methyl methacrylate, methacrylate, ethyl acrylate, butyl acrylate, aryl acrylate, hexyl A homopolymer or a copolymerized copolymer polymerized from at least one monomer selected from the group consisting of acrylate, isopropyl methacrylate, benzyl acrylate, vinyl acrylate, 2-methoxyethyl acrylate and styrene acrylate may be used .

The lenticular lens layer can be formed, for example, by applying a raw resin composition for a lenticular lens layer on the first transparent electrode layer, roll molding using a roll having a predetermined pattern, and then curing .

The raw resin composition used in the production of the lenticular lens layer may have a refractive index after curing of 1.3 to 1.8, preferably 1.5 to 1.7.

The lenticular lens layer may be formed with a negative pattern or a positive pattern. Each lens constituting the lenticular lens layer may have an aspherical shape or a shape of a facet having three or more faces. For example, the lens may have a radius of curvature of about 0.01 to 10 mm, 0.05 to 8 mm, and 0.1 to 5 mm. Further, the lens may have a size commonly used according to the resolution and pixel size of the display device, or the viewing distance. The lenticular lens layer may have a thickness (height from the bottom surface to the highest point of the lens) of 1 to 200 占 퐉, preferably 5 to 50 占 퐉.

The liquid crystal layer 150 is formed by filling liquid crystal material in a space between the lenticular lens layer 130 and the alignment layer 140.

The liquid crystal layer changes the refractive index of the lenticular lens while changing the arrangement according to the application of a voltage. The liquid crystal material may have a difference (? N) between an extraordinary ray refraction index (ne) and a normal ray refraction index (n) of 0.05 to 0.5, preferably 0.08 to 0.3. The refractive index of the liquid crystal material when the voltage is applied or when the voltage is not applied may be the same as that of the replica of the lenticular lens layer, or may show a difference of only 0.001 to 0.01.

The liquid crystal material may have a composition in which at least one liquid crystal selected from a nematic liquid crystal, a ferroelectric liquid crystal, and an anti-ferroelectric liquid crystal is mixed with a polymer resin. The polymer resin to be mixed with the liquid crystal may be an acrylic resin or the like.

The alignment film layer 140 is provided on the second transparent electrode layer 122 of the lower plate to face the lenticular lens layer 130 of the upper plate.

The alignment film layer may include a polymer resin, and may specifically include a polyimide resin, a polyvinyl alcohol resin, a polyvinyl cinnamate resin, and the like. The alignment layer may be formed by applying a polymer resin on the second transparent electrode layer and then drying the polymer layer.

Accordingly, the second transparent electrode layer can be directly attached to the surface of the alignment layer. Since the second transparent electrode layer includes the conductive polymer, a high adhesion force can be maintained without using an adhesive layer or a primer layer separate from the orientation film layer made of a polymer resin.

In addition, the alignment layer may be subjected to a rubbing process before laminating the upper plate and the lower plate. As a result, the surface of the alignment layer can be formed with fine grains for alignment of liquid crystal molecules.

The thickness of the alignment layer may be 10 to 200 nm, preferably 20 to 80 nm.

The 2D / 3D conversion filter 100 may further include a functional coating layer on the outer surfaces of the first transparent substrate layer 111 and / or the second transparent substrate layer 112.

The functional coating layer may be, for example, an antireflection layer, a hard coating layer, a pressure sensitive adhesive layer, or the like, and one or more of these layers may be combined.

The antireflection layer reduces irregular reflection of reflected light due to external light incident on the filter to reduce haze, minimizes the influence of reflection of external light, and allows the filter to exhibit a high light transmittance.

The hard coating layer can prevent the lenticular lens and the like from being physically damaged from the outside.

The adhesive layer may be formed on the second transparent substrate layer to adhere the 2D / 3D conversion filter on the display panel.

In the 2D / 3D conversion filter according to the present invention, the driving voltage is lower than the conventional one, preferably 12V or less.

Specifically, the 2D / 3D conversion filter includes a conductive polymer in the lenticular lens layer, and even in the presence of the lenticular lens layer and the liquid crystal layer, the distance between the electrode layers (d in FIG. 1) 2D / 3D conversion is possible. The driving voltage can be kept constant regardless of the change of the distance between the upper and lower electrode layers according to the thickness variation of the lenticular lens layer.

According to an example of the manufacturing method of the 2D / 3D conversion filter, (1) fabricating a top plate by sequentially forming a first transparent electrode layer and a lenticular lens layer on a first transparent substrate layer; (2) forming a second transparent electrode layer and an orientation film layer on the second transparent substrate layer in order to manufacture a lower substrate; And (3) laminating an upper plate and a lower plate such that the lenticular lens layer of the upper plate faces the alignment film layer of the lower plate, and injecting liquid crystal between the lenticular lens layer and the alignment film layer to form a liquid crystal layer Wherein the lenticular lens layer includes a conductive polymer.

Both steps (1) and (2) above can be performed in a roll-to-roll process.

If necessary, a functional coating layer may be additionally formed on one side of the first transparent substrate layer after the step (1).

Further, if necessary, an adhesive layer may be formed on the outer surface of the second transparent base layer to improve adhesion to the liquid crystal display panel.

2, the present invention also provides a 2D / 3D conversion display comprising a display panel 200 and a 2D / 3D conversion filter 100 of the present invention disposed on the front of the display panel 200 .

The 2D / 3D conversion filter 100 may be attached to the display panel 200 via an adhesive layer 170 disposed on an outer surface of the second transparent substrate layer 112.

The present invention will be described in more detail by way of the following examples. It is to be understood, however, that these Examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

Example 1: Preparation of a 2D / 3D conversion filter having a lenticular lens containing a conductive polymer

Step (1): Production of a top plate

A transparent polyethylene terephthalate (PET) film having a thickness of 100 占 퐉 was prepared as the first transparent substrate layer. Indium tin oxide (ITO) was sputtered on the first transparent base layer to form a first transparent electrode layer having a sheet resistance of about 100? / ?.

Step (2): Formation of lenticular lens layer

99.7 parts by weight of a UV curable acrylic resin and 0.3 parts by weight of a polyisocyanate curing agent were mixed and then 5 to 25 parts by weight of a conductive polymer was further mixed with 100 parts by weight of the mixture to prepare a lenticular lens layer resin composition. The lenticular lens layer resin composition was coated on the previously prepared first transparent electrode layer, and a mother pattern was transferred and UV-cured to form a lenticular lens layer having a thickness of 20 to 90 탆.

As a result, an upper plate having a structure in which a first transparent electrode layer, a first transparent electrode layer, and a lenticular lens layer were laminated in order was produced.

Step (3): Preparation of bottom plate

A second transparent electrode layer was formed on the second transparent base layer in the same manner as in the above step (1). An orientation film resin composition having a solid content of 5% by weight was wet-coated on the second transparent electrode layer, followed by drying and thermosetting to form an orientation film layer having a thickness of 45 to 55 nm.

As a result, a lower substrate having a structure in which an alignment film layer, a second transparent electrode layer, and a second transparent substrate layer were stacked in this order was produced.

Step (4): Lapping process

The upper plate and the lower plate were laminated so that the lenticular lens layer of the upper plate and the alignment film layer of the lower plate faced each other and liquid crystal was injected between the lenticular lens layer and the alignment film layer to form a liquid crystal layer. Thereafter, a dam was formed on the four sides of the liquid crystal layer with a UV-curable sealant and UV-cured.

Comparative Example 1: Production of a 2D / 3D conversion filter having a lenticular lens without a conductive polymer

A 2D / 3D conversion filter was fabricated by performing the same procedure as in Example 1, except that a lenticular lens layer was formed without adding a conductive polymer in the step (2).

100: 2D / 3D conversion filter,
111: first transparent substrate layer, 112: second transparent substrate layer,
121: first transparent electrode layer, 122: second transparent electrode layer,
130: lenticular lens layer, 140: orientation film layer,
150: liquid crystal layer, 170: adhesive layer,
200: display panel, d: distance between electrode layers.

Claims (4)

A 2D / 3D conversion filter including a first transparent substrate layer, a first transparent electrode layer, a lenticular lens layer, a liquid crystal layer, an orientation film layer, a second transparent electrode layer, and a second transparent substrate layer in a laminated structure in this order, A 2D / 3D switchable filter, wherein the lenticular lens layer comprises a conductive polymer.
The method according to claim 1,
Wherein the conductive polymer is contained in an amount of 5 to 50 wt% based on the weight of the lenticular lens layer.
The method according to claim 1,
Wherein the 2D / 3D conversion filter has a driving voltage of 12V or less.
Display panel, and
A non-spectacular 2D / 3D conversion display comprising the 2D / 3D conversion filter of claim 1 disposed on the front surface of the display panel.

Images