KR101913201B1 - 2 and 3 dimensional stereography image displayable device - Google Patents

Abstract

The present invention provides a display device comprising: a display device for displaying an image; A polarization control panel including first and second substrates made of a plastic or film material and having a retardation of 10 nm to 40 nm and disposed on the display device and a first liquid crystal layer interposed between the two substrates; ; And a lens layer disposed on the polarization control panel and including a plurality of lenses having anisotropic characteristics and an isotropic material layer covering the plurality of lenses and having isotropic properties.

Description

[0001] The present invention relates to a two- and three-dimensional stereographic image displayable device,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device capable of two-dimensional and three-dimensional implementations, and more particularly to a display device capable of realizing two-dimensional and three-dimensional images having a configuration capable of reducing manufacturing costs.

Generally, a liquid crystal display device is composed of two opposing electrodes and a liquid crystal layer formed therebetween. The liquid crystal molecules of the liquid crystal layer are driven by an electric field generated by applying a voltage to the two electrodes. The liquid crystal molecules have a polarization property and an optical anisotropy. The polarization property means that when the liquid crystal molecules are placed in the electric field, the charges in the liquid crystal molecules collide with both sides of the liquid crystal molecules, and the molecular alignment direction changes according to the electric field. Refers to changing the path of the emitted light and the polarization state differently depending on the incident direction or polarization state of the incident light due to the elongated structure of the liquid crystal molecules and the aforementioned molecular arrangement direction.

Accordingly, the liquid crystal layer exhibits a difference in transmittance due to the voltage applied to the two electrodes, and the 2D image can be displayed by varying the difference between the pixels.

Meanwhile, in recent years, a liquid crystal display device capable of displaying 3D images in response to the increase in demands of users for a liquid crystal display device capable of realizing a stereoscopic image and realizing a 3D image, that is, a 3D image can be realized.

Generally, stereoscopic images expressing 3D are made by the principle of stereoscopic vision through two eyes. By using the binocular disparity which appears because the time difference of the two eyes, that is, A liquid crystal display device capable of displaying stereoscopic images has been proposed.

The 3D images will be described in more detail. The left and right eyes viewing the LCD display different 2D images. When the two images are transmitted to the brain through the retina, the brain fuses them exactly to each other, The depth and the sense of reality of the image are reproduced. Such a phenomenon is usually referred to as stereography.

Techniques proposed for displaying a 3D image in a device having a 2D image display such as a liquid crystal display device include a stereoscopic image display device using special glasses, a non-eye stereoscopic image display device, and a holographic display device.

Of these, a stereoscopic image display device using special glasses is widely commercialized at present, but since a user must wear glasses to view a 3D image, interest in a non-spectacle-type display device has recently increased.

The non-eye-tightening 3D image display device has a parallax barrier system in which an image can be separated and observed through a vertical grid-like aperture in front of each of the images in the right and left eyes and a parallax barrier system in which a cylindrical lens A lenticular method using a lenticular plate arranged in a stripe arrangement and an integral imaging method using a fly-eye lens plate.

A parallax method and a lenticular method, which are methods for realizing a three-dimensional image by allowing a viewer to separately view a stereo image for a left / right eye, have been mainly adopted. Recently, a polarizing plate and an anisotropic So that 2D and 3D images are displayed.

The polarization control panel is characterized in that an electrode layer is formed on two substrates of glass which are free from retardation and a liquid crystal layer is formed between the electrode layers facing each other. And selectively changes the retardation of 0 and lambda / 2 with respect to the light passing therethrough, thereby finally displaying the 2D or 3D image while passing through the lens having the anisotropic property located above the polarization control panel .

However, the conventional 2D and 3D switchable swingable image display device having such a configuration is composed of a display device for displaying 2D, a polarization adjusting panel, and an anisotropic lens, and in particular, a glass substrate is used for constituting the polarization controlling panel It is difficult to realize a lightweight thin type which is a trend of a display device of a display device. By using a relatively expensive glass substrate, the manufacturing cost is increased and the competitiveness of the product is lowered.

Accordingly, it is an object of the present invention to provide a display device capable of realizing 2D and 3D images that can realize a thin and lightweight while reducing manufacturing costs.

According to an aspect of the present invention, there is provided a 2D and 3D swipe-able display device including: a display device for displaying an image; A polarization control panel including first and second substrates made of a plastic or film material and having a retardation of 10 nm to 40 nm and disposed on the display device and a first liquid crystal layer interposed between the two substrates; ; And a lens layer disposed on the polarization control panel and composed of a plurality of lenses having anisotropic characteristics and an isotropic material layer having isotropic properties covering the plurality of lenses.

The display device includes an array substrate having a plurality of pixel regions defined therein and having a thin film transistor and pixel electrodes connected to the pixel regions, a color filter substrate having a color filter, Wherein the color filter substrate or the array substrate is provided with a common electrode and the first and second polarizers are provided on the outer surface of the array substrate and the color filter substrate, Which is a liquid crystal display device.

The material having the retardation of 10 nm to 40 nm is PC (poly carbonate).

The polarization control panel is characterized in that a retardation change of 0 and? / 2 is generated with respect to light passing therethrough by voltage on / off.

The polarization control panel may include a first electrode and a first alignment layer which are transparent to the inner surface of the first substrate, a second electrode and a second alignment layer that are transparent to the inner surface of the second substrate, And the liquid crystal layer is interposed between the first and second alignment films. In this case, the optical axis of the first and second substrates is arranged to be perpendicular to the alignment direction of the liquid crystal molecules in the first liquid crystal layer.

The polarization control panel may have a retardation of 10 nm to 40 nm by itself and the remaining retardation of the first liquid crystal layer due to the entangled energy of the first and second alignment layers It is characterized by compensation.

The lens of the lens layer transmits light so that light polarized in a first direction has a first refractive index and light polarized in a second direction perpendicular to the first direction has a second refractive index, Layer has a second refractive index such that light polarized in the first direction is refracted due to the difference in refractive index at the boundary between the lens and the layer of isotropic material and light polarized in the second direction is refracted at the boundary of the lens and the layer of isotropic material .

The 2D and 3D image switchable display device according to the present invention has a lightweight and thin shape compared to a glass substrate and is made of a relatively low-cost plastic or film, thereby achieving a lightweight thin shape and reducing manufacturing cost .

In consideration of the retardation change of the liquid crystal layer due to the entangling energy of the alignment layer in the polarization control panel of the present invention, the plastic or the film itself is made of a material having a retardation value of 10 nm to 40 nm, The effect of improving the display quality by allowing the adjustment panel to more accurately realize the retardation change when the voltage is turned on and off and further the effect of lowering the driving voltage of the polarization adjustment panel due to the accuracy of the retardation change of the polarization adjustment panel have.

1A and 1B are schematic cross-sectional views of a 2D and 3D swipe-able display device according to an embodiment of the present invention, respectively, illustrating the transmission state of light during 3D image implementation and 2D image implementation.
2 is a sectional view of a polarization control panel provided in a 2D and 3D swipeable display device according to an embodiment of the present invention;
FIGS. 3A and 3B are diagrams showing changes in state of light in a second polarizing plate, a polarization adjusting panel and a lens layer of the first display device. FIG.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

FIGS. 1A and 1B are schematic cross-sectional views of a 2D and 3D swipe-able display device according to an embodiment of the present invention, respectively showing the transmission state of light during 3D image implementation and 2D image implementation, FIG. 2 is a cross-sectional view of a polarization control panel included in a 2D and 3D swipeable display device according to an embodiment of the present invention.

As shown, the 2D and 3D swipe-able display device 100 according to the embodiment of the present invention mainly includes a first display device 110 for displaying a 2D image, a polarization control panel 140, And a lens layer 160 including a plurality of lenses 161 and an isotropic material layer 165.

A plurality of pixel regions (not shown) are defined, and a thin film transistor (not shown), which is a switching element, and a pixel electrode 112 connected thereto are provided in each pixel region A color filter substrate 121 including an array substrate 111 and corresponding color filter layers (not shown) corresponding to red, green and blue color filter patterns in respective pixel regions (not shown) And a first liquid crystal layer 125 interposed between the first and second substrates 111 and 121.

At this time, the array substrate 111 and the color filter substrate 121 are characterized by being made of a glass material having a retardation value close to zero.

A transparent common electrode 122 may be formed on the entire surface of the display area of the color filter substrate 121 in correspondence with the pixel electrode 112 in the first display device 110, A common electrode (not shown) may be formed in each pixel region (not shown) so as to alternate with the pixel electrode (not shown). In this case, common electrodes (not shown) The electrode is characterized by a bar shape.

When the transparent common electrode 122 is formed on the color filter substrate 121, the first display device 110 generates a vertical electric field, so that a TN (Twist nematic) mode or ECB (Electrically Controlled Birefringence When the transparent common electrode 122 is provided on the array substrate 111 provided with the pixel electrode 112, a transverse electric field is generated and thus the transverse electric field mode operates.

Although not shown in the drawings, first and second alignment films (not shown) are further provided in contact with the lower surface and the upper surface of the first liquid crystal layer 125, respectively.

The first and second polarizers 113 and 123 have polarization axes perpendicular to each other on the outer surfaces of the array substrate 111 and the color filter substrate 121 of the first display device 110 .

The first and second display devices 110 and 110 have a configuration in which a retardation change of 10 to 40 nm is generated with respect to light passing through the first display device 110, Two substrates 141 and 151 and a first transparent electrode 143 and a second transparent electrode 153 respectively provided on inner sides of the two substrates 141 and 151, And a second liquid crystal layer 149 interposed between the first liquid crystal layer 143 and the second liquid crystal layer 153.

A third alignment layer 145 is provided between the first transparent electrode 143 and the second liquid crystal layer 149 and a second alignment layer 145 is formed between the second liquid crystal layer 149 and the second transparent electrode 153. In this case, 4 orientation film 155 is provided.

Meanwhile, in the polarization control panel 140 having such a configuration, the plastic or film material is, for example, polycarbonate (PC).

The second liquid crystal layer 149 may be a liquid crystal for a TN mode or a liquid crystal for an ECB mode or may be a polymer dispersed liquid crystal (PDLC) or a polymer liquid crystal .

On the other hand, a plurality of lenses 161 are arranged on the polarization control panel 140 having the above-described structure, and materials having anisotropic properties are arranged in one direction. A lens layer 160 composed of an isotropic material layer 165 filled with an isotropic material is provided.

At this time, the material forming the lens 161 having the anisotropic property is preferably a reactive mesogen (RM).

Meanwhile, the lens 161, which is one component of the lens layer 160, advances to have a first refractive index for light polarized in the first direction and is polarized in a second direction perpendicular to the first direction And proceeds to have a second refractive index for light.

And the refractive index of the isotropic material layer 165 made of the isotropic material has the second refractive index at which the light polarized in the second direction passing through the lens 161 is felt.

When the light polarized in the first direction is incident on the lens 161 having the anisotropic characteristics in the light incident from the lower portion of the lens layer 160 having such characteristics, the first refractive index is given to the lens layer 160, 2 due to the difference in refractive index at the interface with the isotropic material layer 165 made of an isotropic material having refractive index.

When the light polarized in the second direction is incident on the lens 161 having the anisotropic property, the second refractive index is equal to the refractive index of the isotropic material layer 165, (Not shown).

Accordingly, when the light incident from the bottom is refracted in a specific direction due to the role of the lens layer 160, the 2D and 3D swipe-able display device 100 according to the embodiment of the present invention, And the user can view the 3D image within the view area. When the light is passed without being refracted, the user can view the 2D image because no light is collected at a specific position.

The configuration of the polarization control panel 140, which is the most characteristic component in the 2D and 3D swipe-able display device 100 according to the embodiment of the present invention, will be described in more detail.

Referring to FIG. 2, the polarization control panel 140 has flexible characteristics, and the first and second substrates 141 and 151, which are made of transparent plastic or film, face each other. Although not shown in the drawing, an adhesive layer (not shown) is provided on the outer surface of the first substrate 141 to adhere to the first display device (110 of FIG. 1A).

On the inner surfaces of the first and second substrates 141 and 151, first and second transparent substrates made of a transparent conductive material such as indium tin oxide (ITO) or indium-zinc-oxide (IZO) Electrodes 143 and 153 are provided on the inner surfaces of the first and second transparent electrodes 143 and 153. The third and fourth alignment layers 145 and 155 are provided on the inner surfaces of the first and second transparent electrodes 143 and 153,

A second liquid crystal layer 149 is provided between the third and fourth alignment layers 145 and 155.

In this case, the plastic or film, which is the material of the first and second substrates 141 and 151 of the polarization control panel 140, is made of polycarbonate (PC). Each of the first and second substrates 141 and 151 made of a PC (poly carbonate) material is characterized by causing a retardation change of 10 nm to 40 nm with respect to light passing through the first and second substrates 141 and 151.

The first and second substrates 141 and 151 made of PC (poly carbonate) are stretched due to their manufacturing characteristics, and therefore, the retardation change of about 10 nm to 40 nm is generated with respect to the light passing through the first and second substrates 141 and 151 .

The first and second substrates 141 and 151 made of polycarbonate (PC) can be formed to have a retardation change of less than 10 nm through surface treatment or the like, but the manufacturing process characteristics The manufacturing costs of the 2D and 3D swipe-able display device 100 according to the embodiment of the present invention are increased, resulting in an increase in the manufacturing cost and lowering the price competitiveness of the product.

Therefore, in the polarization control panel 140 used in the 2D and 3D swipe-able display device 100 according to the embodiment of the present invention, it is possible to cause a retardation change of about 10 nm to 40 nm And the first and second substrates 141 and 151 are made of PC (poly carbonate) material.

At this time, the optical axes of the first and second substrates 141 and 151 having the retardation change of about 10 nm to 40 nm and the alignment directions of the third and fourth alignment films 145 and 155 are arranged perpendicular to each other to be. The orientation directions of the initial liquid crystal molecules of the second liquid crystal layer 149 arranged by the optical axis of the first and second substrates 141 and 151 and the third and fourth alignment films 145 and 155 are perpendicular It is characterized by being in one state.

On the other hand, when the first and second substrates 141 and 151 themselves are made of PC (polycarbonate) material causing a retardation change of about 10 nm to 40 nm, the second liquid crystal layer 149 is subjected to a major retardation change And serves to cancel the residual retardation due to the laminated structure characteristics of the second liquid crystal layer 149 in contact with the third and fourth alignment layers 145 and 155 in the polarization control panel 140, So that the retardation change of the polarization control panel 140 itself is more accurately performed.

 That is, the second liquid crystal layer 149 provided in the polarization control panel 140 is in contact with both surfaces thereof and is positioned between the third and fourth alignment layers 145 and 155, and the third and fourth Since the alignment films 145 and 155 have entanglement energy at the surface thereof, the second liquid crystal layer 149 has a residual retardation value of 30 nm to 40 nm when a voltage is applied.

Therefore, when a voltage is applied to a general polarization control panel (a conventional polarization control panel using a glass substrate having little change in retardation) with such a configuration, light passing therethrough causes a retardation change of about 30 nm to 40 nm, When the voltage is turned ON / OFF, the retardation changes by 30 nm to 40 nm and? / 2 are caused. Therefore, when passing through the lens layer 160 during voltage application, Quality deterioration occurs.

However, in the polarization control panel 140 used in the 2D and 3D swipe-able display device 100 according to the embodiment of the present invention, the first and second substrates 141 and 151 themselves have a retardation value, When the retardation value of the first and second substrates 141 and 151 is 15 nm to 20 nm, the residual retardation change of 30 nm to 40 nm generated in the second liquid crystal layer 149 upon voltage application is canceled, (Not shown) having two substrates and a retardation value of 0 nm when the voltage is turned off, the lens 161 and the isotropic material layer 165 The user can view the 3D image with higher quality.

In this case, when the cell gap of the second liquid crystal layer 149 is designed to reflect the retardation value of the first and second substrates 141 and 151 themselves, the retardation of the second liquid crystal layer 149 can be more precisely You may.

For example, when the retardation values of the first and second substrates 141 and 151 are respectively 40 nm, the retardation value of the second liquid crystal layer 149 is designed to have? / 2 + 80 nm .

Further, in the case of the 2D and 3D swipe-able display device 100 according to the embodiment of the present invention, the polarization control panel 140 is advantageous in that it uses a light and thin plastic or film instead of a relatively heavy and thick glass substrate, And the remaining retardation due to the structure in which the second liquid crystal layer 149 is formed between the third and fourth alignment layers 145 and 155 can be canceled, It has an effect of reducing the voltage.

3A and 3B are diagrams showing changes in the state of light only in the second polarizing plate, the polarization adjusting panel and the lens layer of the first display device. Fig. 3A and Fig. 3B show the case where no voltage is applied to the polarization control panel, Respectively.

First, referring to FIG. 3A, light transmitted through the second polarizer 123 of the first display device 110 becomes polarized light in the first direction.

This light is incident on the polarization control panel 140 in a voltage off state, and becomes a light polarized in a second direction perpendicular to the first direction through a change in retardation as a whole of? / 2.

At this time, the light polarized in the second direction has the same second refractive index in both the lens 161 and the isotropic material layer 165, so that refraction is not generated at the boundary between the lens 161 and the isotropic material layer 165 The user can see the 2D image from the first display device 110 as it is.

3B, the light transmitted through the second polarizing plate 123 of the first display device 110 becomes polarized light in the first direction, and this light is transmitted through the polarization control panel 140 in the ON state, .

In this case, since the polarized light in the first direction has no change in retardation when it is incident on the polarization control panel of the voltage-on state, the polarization control panel 140 maintains the polarized state in the first direction, .

The light polarized in the first direction has a first refractive index when passing through the lens 161 of the lens layer 160 and refracts at a boundary between the first refractive index and the isotropic material layer 165 having the second refractive index, So that the user can view the 3D image.

The present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

100: 2D and 3D swappable display device
110: first display device
111: array substrate
112: pixel electrode
113: first polarizer plate
121: Color filter substrate
122: common electrode
123: second polarizer plate
125: second liquid crystal layer
140: polarization control panel
141: first substrate
149: second liquid crystal layer
151: second substrate
160: Lens layer
161: Lens (with anisotropic properties)
165: Isotropic material layer

Claims (8)

A first liquid crystal layer sandwiched between the two substrates; and a second liquid crystal layer sandwiched between the array substrate and the outer surface of the color filter substrate, the first and second polarizing plates having polarization axes perpendicular to each other, A display device for displaying an image;
A polarization control panel including first and second substrates made of a plastic or film material and having a retardation of 10 nm to 40 nm and disposed on the display, and a second liquid crystal layer interposed between the two substrates;
And a lens layer disposed on the polarization control panel and composed of a plurality of lenses having anisotropic characteristics and an isotropic material layer having an isotropic property covering the plurality of lenses,
Wherein the polarization control panel comprises: a transparent first electrode positioned between the first substrate and the second liquid crystal layer; a first alignment layer positioned between the first electrode and the second liquid crystal layer; A second transparent electrode positioned between the second liquid crystal layers, and a second alignment layer positioned between the second electrode and the second liquid crystal layer,
Wherein the first and second substrates themselves have a retardation of 10 nm to 40 nm to compensate for the residual retardation of the second liquid crystal layer due to the energizing energies of the first and second alignment layers, Swipeable display.

The method according to claim 1,
In the display device,
A plurality of pixel regions are defined in the array substrate, a thin film transistor and pixel electrodes connected to the thin film transistors are provided in each pixel region,
Wherein the color filter substrate is provided with a color filter,
Wherein the color filter substrate or the array substrate is provided with a common electrode.

3. The method of claim 2,
Wherein the material having the retardation of 10 nm to 40 nm is polycarbonate (PC).
3. The method of claim 2,
Wherein the polarization control panel generates a retardation change of 0 and? / 2 with respect to light passing therethrough by voltage on / off.
delete The method according to claim 1,
And the optical axes of the first and second substrates are arranged to be perpendicular to the alignment direction of the liquid crystal molecules in the first liquid crystal layer.

delete 3. The method of claim 2,
Wherein the lens of the lens layer passes light so that light polarized in a first direction has a first refractive index and light polarized in a second direction perpendicular to the first direction has a second refractive index, The light polarized in the first direction with the second refractive index is refracted due to the difference in refractive index at the boundary between the lens and the layer of the isotropic material and the light polarized in the second direction is transmitted through the boundary of the lens and the isotropic material without refraction Dimensional image display device.

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