KR20050092541A - Liquid crystal display - Google Patents

Abstract

The present invention relates to a liquid crystal display device, wherein the liquid crystal display device of the present invention includes a liquid crystal display panel having a plurality of pixels, a first retardation film positioned under the liquid crystal display panel, a lower polarizing plate positioned under the first retardation film, and a liquid crystal. It is preferable to include a second retardation film positioned on the display panel, a lenticular lens layer positioned on the second retardation film, a stereoscopic image conversion switch located on the lenticular lens layer, and an upper polarizing plate positioned on the stereoscopic image conversion switch. Accordingly, the liquid crystal display according to the present invention maintains the viewing distance by placing the second retardation film under the lenticular lens layer, and can manufacture a small liquid crystal display device having a semi-transmissive mode capable of simultaneously implementing a stereoscopic image and a planar image. There is an advantage that it can.

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY}

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device for implementing a stereoscopic image.

The services to be realized for the high speed of information based on the high-speed information communication network today are the multimedia service centered on the digital terminal which processes text, voice, and video at high speed from the simple listening and speaking service such as the current telephone. It is expected to develop and ultimately evolve into a superspatial 3D stereoscopic information communication service that can see, feel and enjoy realistic and three-dimensional transcendence of time and space.

In general, three-dimensional images that represent three-dimensional image is made by the principle of stereo vision through two eyes. The parallax of two eyes, that is, binocular disparity that appears because two eyes are about 65mm apart, is the most important of three-dimensional effect. It can be called a factor. In other words, the left and right eyes each look at different two-dimensional images, and when these two images are transmitted to the brain through the retina, the brain accurately fuses each other to reproduce the depth and reality of the original three-dimensional image. This ability is commonly referred to as stereography.

The stereoscopic image display device uses binocular disparity, and according to whether the viewer wears separate glasses, stereoscopic polarization and time division, autostereoscopic parallax-barrier, lenticular and blinding There is a lighting (blinking light) method.

While the former can enjoy stereoscopic images, many people need to wear separate polarized glasses or liquid crystal shutter glasses, and the latter combines an image splitter and a cylindrical lens array on the display, respectively. Although the observation range is fixed to a small number of people, there is a feature that does not wear a separate glasses type tends to be preferred. The spectacle stereoscopic image display device causes inconvenience and unnaturalness because the viewer must wear special glasses. On the other hand, many studies have been conducted on the non-glasses stereoscopic display device because the observer directly observes the screen and the above-mentioned disadvantages disappear.

The stereoscopic image display device has a structure in which a lenticular lens layer is disposed on a liquid crystal display device.

In general, a liquid crystal display is one of the flat panel display devices most widely used. The liquid crystal display includes two display panels on which a field generating electrode is formed and a liquid crystal layer interposed therebetween. A display device which controls light transmittance through a liquid crystal layer by rearranging molecules.

Conventionally, a lenticular lens layer and a stereoscopic image conversion switch are disposed in a liquid crystal display of a transmissive mode to simultaneously implement a stereoscopic image and a planar image.

In order to apply a liquid crystal display device capable of simultaneously realizing a stereoscopic image and a planar image to a small product such as a mobile phone, a liquid crystal display device having a low power transflective mode is preferable, but the transflective mode generally includes a phase difference film so that such phase difference is achieved. It is often difficult to realize a stereoscopic image by film.

In addition, the liquid crystal display of a small product such as a mobile phone should have a viewing distance of a stereoscopic image of about 30 cm. In the case of a rectangular mobile phone having a short horizontal length, the diameter of the lenticular lens should be large and the distance from the liquid crystal display panel to the lenticular lens should be short in order to satisfy the viewing distance of about 30 cm.

 Therefore, in the case of a rectangular cellular phone, a plurality of sub-pixels are disposed for each lenticular lens having a large diameter in order to satisfy a viewing distance of about 30 cm and to implement a stereoscopic image.

An object of the present invention is to provide a small liquid crystal display device having a transflective mode that maintains a viewing distance and simultaneously implements a stereoscopic image and a planar image.

The liquid crystal display according to the present invention includes a liquid crystal display panel having a plurality of pixels, a first retardation film positioned under the liquid crystal display panel, a lower polarizing plate positioned under the first retardation film, and a second liquid crystal display panel positioned on the liquid crystal display panel. A second retardation film, a lenticular lens layer positioned on the second retardation film, a stereoscopic image conversion switch located on the lenticular lens layer, and an upper polarizing plate positioned on the stereoscopic image conversion switch.

Moreover, it is preferable that the said 1st phase difference film and the 2nd phase difference film have the effect of phase retardation of 1/4 wavelength, respectively.

In addition, the liquid crystal display panel is preferably a semi-transmissive type.

In addition, the stereoscopic image switching switch has a phase delay effect of 1/2 wavelength, and the liquid crystal display panel has a phase delay effect of 1/2 wavelength in a transmission region, and a phase delay of 1/4 wavelength in a reflection region. It is desirable to have the effect of.

In addition, a flat image is implemented when no voltage is applied to the liquid crystal display panel and the stereoscopic image switching switch, and a stereoscopic image is implemented when a voltage is applied to the liquid crystal display panel and the stereoscopic image switching switch. Do.

The liquid crystal display panel may further include a lower substrate, a pixel electrode formed on the lower substrate, an upper substrate positioned to face the lower substrate, a color filter and a common electrode formed below the upper substrate, the pixel electrode, and a common substrate. And a liquid crystal layer formed between the electrodes, wherein the pixel electrode is composed of a transmission electrode and a reflection electrode.

The stereoscopic image conversion switch may include a switching lower electrode, a switching upper electrode facing the switching lower electrode, and a switching liquid crystal layer formed between the switching upper electrode and the switching lower electrode.

In addition, the lenticular lens layer is preferably made of a lenticular lens having a refractive index anisotropy and a polymer layer having a refractive index isotropy.

In addition, when the pixel is made of subpixels of red, green, and blue filters, it is preferable that there are four or more subpixels corresponding to each lens of the lenticular lens layer.

In addition, the first retardation film and the lower polarizing plate are preferably integrated.

Then, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. Like parts are designated by like reference numerals throughout the specification. When a part of a layer, film, region, plate, etc. is said to be "on" another part, this includes not only the other part being "right over" but also another part in the middle. On the contrary, when a part is "just above" another part, there is no other part in the middle.

A liquid crystal display according to an exemplary embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

1 to 4 are cross-sectional views of a liquid crystal display according to an exemplary embodiment of the present invention.

FIG. 1 is a diagram illustrating a polarization state of light in a transmission region of a liquid crystal display to implement a planar image, and FIG. 2 is a diagram illustrating a polarization state of light in a transmission region of a liquid crystal display to implement a stereoscopic image. FIG. 3 is a diagram illustrating a polarization state of light in a reflective region of a liquid crystal display to implement a planar image, and FIG. 4 is a diagram illustrating a polarization state of light in a reflective region of a liquid crystal display to implement a stereoscopic image.

1 to 4, a liquid crystal display according to an exemplary embodiment of the present invention may include a liquid crystal display panel 300 having a plurality of pixels and a first phase difference film positioned under the liquid crystal display panel 300. 13), the lower polarizing plate 12 positioned below the first retardation film 13, the second retardation film 23 positioned on the liquid crystal display panel 300, and the lenticular lens positioned on the second retardation film 23. A layer 400, a stereoscopic image conversion switch 500 positioned on the lenticular lens layer 400, and an upper polarizer 22 positioned on the stereoscopic image conversion switch 500.

The liquid crystal display panel 300 is disposed under the lower substrate 110, the pixel electrode 190 formed on the lower substrate 110, and the upper substrate 210 and the upper substrate 210 which are positioned to face the lower substrate 110. The liquid crystal layer formed between the color filter 230 and the common electrode 270, the pixel electrode 190, and the common electrode 270 of red (R), green (G), and blue (B) formed in the Include 3). The common electrode 270 is made of a transparent conductive material such as indium tin oxide (ITO). The pixel electrode 190 includes a transmission electrode and a reflection electrode.

The transmissive electrode uses a transparent electrode to transmit light from the backlight positioned below the lower substrate 110, and the reflecting electrode is formed of metal or the like so as to reflect light from the outside to the front of the transflective liquid crystal display. Formed.

The liquid crystal display panel 300 is preferably a semi-transmissive type consisting of a transmissive region where a transmissive electrode is formed and a reflective region on which a reflective electrode is formed.

The transmission area and the reflection area of the liquid crystal display panel 300 may have different cell gaps or form different electric fields. In this case, the transmission area has an effect of phase retardation of 1/2 wavelength λ, and the reflection area Is manufactured so as to have an effect of phase retardation of 1/4 wavelength [lambda].

The effect of phase retardation of 1/2 wavelength λ in the transmissive region of the liquid crystal display panel 300 and the effect of phase retardation of 1/4 wavelength λ in the reflective region may vary according to the characteristics of the liquid crystal display panel. . Meanwhile, the transmission region and the reflection region may be designed to have the same cell gap.

The liquid crystal display panel 300 is preferably in a twisted nematic (TN) mode or an ECB mode.

The stereoscopic image switching switch 500 includes a switching lower electrode, a switching upper electrode facing the switching lower electrode, a switching liquid crystal layer formed between the switching upper electrode and the switching lower electrode.

The stereoscopic image conversion switch 500 is manufactured to have an effect of phase retardation of 1/2 wavelength lambda.

The first retardation film 13 and the second retardation film 23 each have an effect of retardation of quarter wavelength lambda.

The first retardation film 13 and the second retardation film 23 having the effect of phase retardation of quarter wavelength [lambda] are converted into linearly polarized light or circularly polarized light into linearly polarized light.

The lenticular lens layer 400 includes a lenticular lens 410 having refractive index anisotropy and a polymer layer 420 having refractive index isotropy formed thereon. The refractive index in the minor axis direction and the major axis direction of the lenticular lens 410 are different from each other, and any one of the refractive index in the minor axis direction and the major axis direction is the same as the refractive index of the polymer layer 420.

The pixel of the liquid crystal display panel 300 includes subpixels of the red, green, and blue filters 230. In addition, it is preferable that there are four or more subpixels corresponding to each lens 410 of the lenticular lens layer 400. This is because a rectangular cell phone satisfies a viewing distance of about 30 cm and a plurality of sub-pixels must be disposed for each lenticular lens 410 having a large diameter in order to realize a stereoscopic image.

1 through 4 illustrate four sub-pixels corresponding to the respective lenses 410 of the lenticular lens layer 400.

And the 2nd phase difference film 23 and the lower polarizing plate 12 are integrally formed.

Referring to the operation of the liquid crystal display according to an embodiment of the present invention configured as described above are as follows.

First, a transmissive mode liquid crystal display when a planar image is implemented will be described with reference to FIG. 1.

As shown in FIG. 1, the light source 50 having all the directional components generated in the backlight passes through the lower polarizing plate 12 to be linearly polarized left and right 51 in parallel with the transmission axis 12a of the lower polarizing plate 12.

Here, ↔ shown in Figure 1 is the left and right linearly polarized light, ?? Is defined as front and rear linear polarization.

The left and right linearly polarized light 51 passes through the first retardation film 13 having the effect of phase retardation of 1/4 wavelength to be left circularly polarized light 52.

The left circularly polarized light 52 passes through the liquid crystal display panel 300 having the effect of phase retardation of 1/2 wavelength and becomes right circularly polarized light 53.

Here, the liquid crystal display panel 300 is manufactured so as not to change the polarization characteristics of the light when no voltage is applied to the liquid crystal layer, and not to change the polarization characteristics of the light when the voltage is applied.

That is, the left circularly polarized light 52 changes to the right circularly polarized light 53 through the liquid crystal display panel 300 in a state where no voltage is applied.

The right circularly polarized light 53 passes through the second retardation film 23 having the effect of phase retardation of 1/4 wavelength, and becomes linearly polarized light 54 before and after.

The major axis direction of the lenticular lens 410 coincides with the polarization direction of the front and rear linearly polarized light 54. In addition, since the refractive index of the long axis direction of the lenticular lens 410 and the refractive index of the polymer layer 420 formed on the lenticular lens 410 are the same, the front and rear linear polarization 54 maintains the lenticular lens layer 400 as it is. To pass.

That is, since the refractive index of the isotropic polymer 420 with respect to the front and rear linear polarization 54 and the anisotropic polymer 410 have the same refractive index, the front and rear linear polarization 54 is the lenticular lens layer 400. It does not refract when passing through.

The front and rear linearly polarized light 55 passing through the lenticular lens layer 400 without refraction passes through the stereoscopic image conversion switch 500 having the effect of phase retardation of 1/2 wavelength and is left and right linearly polarized light 56.

Here, the stereoscopic image conversion switch 500 is manufactured so as not to change the polarization characteristics of the light when a voltage is not applied to the switching liquid crystal layer, and not to change the polarization characteristics of the light when a voltage is applied.

That is, the transmissive axis of the front and rear linearly polarized light 55 is changed by 90 ° to the left and right linearly polarized light 56 after passing through the stereoscopic image conversion switch 500 in the state where no voltage is applied.

The left and right linearly polarized light 56 passes through the upper polarizing plate 22 whose transmission axis 22a is parallel to the left and right linearly polarized light 56 as it is, thereby implementing a planar image of the left and right linearly polarized light 60.

Next, a transmission mode liquid crystal display when a stereoscopic image is implemented will be described with reference to FIG. 2.

As shown in FIG. 2, the light source 50 having all the directional components generated in the backlight passes through the lower polarizer 12 and is linearly polarized left and right 51 in parallel with the transmission axis 12a of the lower polarizer 12.

The left and right linearly polarized light 51 passes through the first retardation film 13 having the effect of phase retardation of 1/4 wavelength to be left circularly polarized light 52.

The left circularly polarized light 52 passes through the liquid crystal display panel 300 in a state where a voltage is applied thereto without a phase delay. Here, the liquid crystal display panel 300 is manufactured so as not to change the polarization characteristics of the light when no voltage is applied to the liquid crystal layer, and not to change the polarization characteristics of the light when the voltage is applied.

The left circularly polarized light 63 passes through the second retardation film 23 having the effect of phase retardation of 1/4 wavelength and is left and right linearly polarized light 64.

The minor axis direction of the lenticular lens 410 coincides with the polarization direction of the left and right linearly polarized light 64. Since the refractive index of the lenticular lens 410 in the minor axis direction and the refractive index of the polymer layer 420 formed on the lenticular lens 410 are different from each other, the left and right linearly polarized light 64 pass through the lenticular lens layer 400. And refracted.

That is, since the refractive index of the isotropic polymer 420 with respect to the left and right linearly polarized light 64 and the refractive index of the anisotropic polymer 410 are different from each other, the left and right linearly polarized light 64 has the lenticular lens layer 400. Refract when passing.

Therefore, the left and right eyes of the observer see different images refracted by the lenticular lens layer 400, and at this time, a stereoscopic image is realized by feeling a three-dimensional sense through parallax obtained from each image.

The left and right linearly polarized light 65 passing through the lenticular lens layer 400 passes through the stereoscopic image conversion switch 500 in a state where a voltage is applied without a phase delay. Here, the stereoscopic image conversion switch 500 is manufactured so as not to change the polarization characteristics of the light when a voltage is not applied to the switching liquid crystal layer, and not to change the polarization characteristics of the light when a voltage is applied.

In addition, the left and right linearly polarized light 66 passes through the upper polarizing plate 22 whose transmission axis 22a is parallel to the left and right linearly polarized light 66 as it is to implement a stereoscopic image of the left and right linearly polarized light 66.

Next, a reflection mode liquid crystal display when the planar image is implemented will be described with reference to FIG. 3.

As shown in FIG. 3, the light source 70 having all the directional components passes through the upper polarizing plate 22 to be linearly polarized left and right 71 in parallel with the transmission axis 22a of the upper polarizing plate 22.

The left and right linearly polarized light 71 passes through the stereoscopic image switching switch 500 having the effect of phase retardation of 1/2 wavelength and becomes linearly polarized back and forth 75.

Here, the stereoscopic image conversion switch 500 is manufactured so as not to change the polarization characteristics of the light when a voltage is not applied to the switching liquid crystal layer, and not to change the polarization characteristics of the light when a voltage is applied.

That is, the transmissive axis of the left and right linearly polarized light 71 is changed by 90 ° to the front and rear linearly polarized light 75 through the stereoscopic image switching switch 500 in a state where no voltage is applied.

The major axis direction of the lenticular lens 410 coincides with the polarization direction of the front and rear linearly polarized light 75. In addition, since the refractive index of the long axis direction of the lenticular lens 410 and the refractive index of the polymer layer 420 formed on the lenticular lens 410 are the same, the front and rear linear polarization 75 keeps the lenticular lens layer 400 as it is. To pass.

That is, since the refractive index of the isotropic polymer 420 with respect to the front and rear linear polarization 75 and the anisotropic polymer 410 have the same refractive index, the front and rear linear polarization 75 has the lenticular lens layer 400. It does not refract when passing through.

Then, the unrefractive front and rear linearly polarized light 76 passes through the second retardation film 23 having the effect of phase retardation of 1/4 wavelength, and becomes left circularly polarized light 77.

The left circularly polarized light 77 passes through the liquid crystal layer 3 of the liquid crystal display panel 300 having the effect of phase retardation of 1/4 wavelength, and is left and right linearly polarized light 88, by the reflective electrode of the liquid crystal display panel 300. The circularly polarized light 87 is reflected and passed through the liquid crystal layer 3 of the liquid crystal display panel 300 having the effect of phase retardation of 1/4 wavelength.

Here, the liquid crystal display panel 300 is manufactured so as not to change the polarization characteristics of the light when no voltage is applied to the liquid crystal layer 3, and not to change the polarization characteristics of the light when the voltage is applied.

Then, the right circularly polarized light 87 passes through the second retardation film 23 having the effect of phase retardation of quarter wavelength again, and is subjected to front and rear linear polarization 86.

The front and rear linearly polarized light 86 passes through the lenticular lens layer 400 as it is. That is, since the refractive index of the isotropic polymer 420 with respect to the front and rear linear polarization 86 and the anisotropic polymer 410 have the same refractive index, the front and rear linear polarization 86 is the lenticular lens layer 400. It does not refract when passing through.

The front and rear linearly polarized light 86 passing through the lenticular lens layer 400 passes through the stereoscopic image conversion switch 500 having the effect of phase retardation of 1/2 wavelength and is left and right linearly polarized light 81.

That is, the transmission axis of the front and rear linearly polarized light 85 is changed by 90 ° to the left and right linearly polarized light 81 after passing through the stereoscopic image switching switch 500 in the state where no voltage is applied.

The left and right linearly polarized light 81 passes through the upper polarizing plate 22 in which the transmission axis 22a is parallel to the left and right linearly polarized light 81, thereby realizing a planar image of the left and right linearly polarized light 80.

Next, a reflection mode liquid crystal display when a stereoscopic image is implemented will be described with reference to FIG. 4.

As shown in FIG. 4, the light source 70 having all the directional components passes through the upper polarizing plate 22 to be linearly polarized left and right 71 in parallel with the transmission axis 22a of the upper polarizing plate 22.

The left and right linearly polarized light 71 passes through the stereoscopic image conversion switch 500 in a state where a voltage is applied without a phase delay.

Here, the stereoscopic image conversion switch 500 is manufactured so as not to change the polarization characteristics of the light when a voltage is not applied to the switching liquid crystal layer, and not to change the polarization characteristics of the light when a voltage is applied.

The short axis direction of the lenticular lens 410 corresponds to the polarization direction of the left and right linearly polarized light 72. Since the refractive index of the lenticular lens 410 in the minor axis direction and the refractive index of the polymer layer 420 formed on the lenticular lens 410 are different from each other, the left and right linearly polarized light 72 pass through the lenticular lens layer 400. And refracted.

That is, since the refractive index of the isotropic polymer 420 with respect to the left and right linearly polarized light 72 and the refractive index of the anisotropic polymer 410 are different from each other, the left and right linearly polarized light 72 has the lenticular lens layer 400. Refract when passing.

Then, the refracted left and right linearly polarized light 73 passes through the second retardation film 23 having the effect of phase retardation of 1/4 wavelength and becomes right circularly polarized light 74.

The right circularly polarized light 74 passes through the liquid crystal layer 3 of the liquid crystal display panel 300 having the effect of phase retardation of 1/4 wavelength, and then becomes linearly polarized light 89 and is reflected by the reflective electrode of the liquid crystal display panel 300. The left circularly polarized light 84 is reflected and passed through the liquid crystal layer 3 of the liquid crystal display panel 300 having the effect of phase delay of 1/4 wavelength again.

Here, the liquid crystal display panel 300 is manufactured so as not to change the polarization characteristics of the light when no voltage is applied to the liquid crystal layer 3, and not to change the polarization characteristics of the light when the voltage is applied.

The left circularly polarized light 84 passes through the second retardation film 23 having the effect of phase retardation of 1/4 wavelength again and becomes left and right linearly polarized light 83.

The left and right linearly polarized light 83 passes through the lenticular lens layer 400 to implement a stereoscopic image. That is, the short axis direction of the lenticular lens 410 coincides with the polarization direction of the left and right linearly polarized light 83. Since the refractive index of the lenticular lens 410 in the minor axis direction and the refractive index of the polymer layer 420 formed on the lenticular lens 410 are different from each other, the left and right linearly polarized light 83 pass through the lenticular lens layer 400. And refracted.

That is, since the refractive indexes of the isotropic polymer 420 and the anisotropic polymer 410 are different from each other in the lenticular lens layer 400, the left and right linearly polarized light 83 is the lenticular lens layer 400. Refract when passing.

Therefore, the left and right eyes of the observer see different images refracted by the lenticular lens layer 400, and at this time, a stereoscopic image is realized by feeling a three-dimensional sense through parallax obtained from each image.

The left and right linearly polarized light 82 passing through the lenticular lens layer 400 passes through the stereoscopic image conversion switch 500 in a state where a voltage is applied without a phase delay.

In addition, the left and right linearly polarized light 81 passes through the upper polarizing plate 22 whose transmission axis 22a is parallel to the left and right linearly polarized light 81 as it is to implement a stereoscopic image of the left and right linearly polarized light 80.

As described above, in the liquid crystal display of the transflective mode, the stereoscopic image and the planar image may be implemented in the transflective mode without degrading the resolution and decreasing the viewing distance.

5 is a cross-sectional view of a case where a lenticular lens layer and a stereoscopic image conversion switch are disposed in a conventional transflective liquid crystal display device.

The lenticular lens layer 400 and the stereoscopic image conversion switch 500 are positioned on the liquid crystal display panel 300. The retardation film 23 and the upper polarizer 22 are integrally formed on the stereoscopic image conversion switch 500. The retardation film 13 and the lower polarizing plate 12 are integrally formed under the liquid crystal display panel 300.

In the transflective liquid crystal display device having such a structure, when a voltage is applied to the liquid crystal display panel 300 and the lenticular lens layer 400 to implement a stereoscopic image, the circularly polarized light 53 is applied to the lenticular lens layer 400. You will join.

That is, as shown in FIG. 5, the light source 50 having all the directional components passes through the lower polarizing plate 12 to be linearly polarized left and right 51 in parallel with the transmission axis 12a of the lower polarizing plate 12. The left and right linearly polarized light 51 passes through the first retardation film 13 having the effect of phase retardation of 1/4 wavelength and is left circularly polarized light 52. The left circularly polarized light 52 passes through the liquid crystal display panel 300 in a state where a voltage is applied thereto without a phase delay. Here, the liquid crystal display panel 300 is manufactured so as not to change the polarization characteristics of the light when no voltage is applied to the liquid crystal layer 3, and not to change the polarization characteristics of the light when the voltage is applied.

The left circularly polarized light 53 is incident on the lenticular lens layer 400. The lenticular lens layer 400 implements a stereoscopic image by determining a direction of refraction with a lens using anisotropic and isotropic refraction principles when left and right linearly polarized light or front and rear linearly polarized light are incident. However, since circularly polarized light has no polarization direction, it cannot be applied to a transflective liquid crystal display device having a structure as shown in FIG. 5.

In order to solve this problem, the upper polarizing plate 22 and the retardation film 23 may be integrally formed under the lenticular lens layer 400. In this case, the lenticular lens layer 400 and the liquid crystal display panel may be disposed. Since the distance between the 300 is increased, the viewing distance is increased, and therefore, it is difficult to apply to the liquid crystal display device of the rectangular cellular phone.

Accordingly, in the liquid crystal display according to the exemplary embodiment of the present invention, the second retardation film 23 may be formed using a lenticular lens layer to implement a stereoscopic image without increasing the viewing distance even in a rectangular mobile phone having a short horizontal length. 400) so that the linearly polarized light passes through the lenticular lens layer 400.

Although the preferred embodiments of the present invention have been described in detail above, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Accordingly, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concept of the present invention as defined in the following claims also fall within the scope of the present invention.

The liquid crystal display according to the present invention maintains the viewing distance by placing the second retardation film under the lenticular lens layer, and can produce a small liquid crystal display device having a semi-transmissive mode capable of simultaneously implementing stereoscopic and planar images. There is an advantage.

1 to 4 are cross-sectional views of a liquid crystal display according to an exemplary embodiment of the present invention. FIG. 1 is a view illustrating a polarization state of light in a transmission region of a liquid crystal display to implement a planar image.

2 is a diagram illustrating a polarization state of light in a transmission region of a liquid crystal display to realize a stereoscopic image.

3 is a diagram illustrating a polarization state of light in a reflection area of a liquid crystal display to implement a planar image.

4 is a diagram illustrating a polarization state of light in a reflection area of a liquid crystal display to realize a stereoscopic image.

5 is a cross-sectional view of a case where a lenticular lens layer and a stereoscopic image conversion switch are disposed in a conventional transflective liquid crystal display device.

Claims (10)

A liquid crystal display panel having a plurality of pixels, A first retardation film positioned under the liquid crystal display panel, A lower polarizer positioned under the first retardation film A second retardation film positioned on the liquid crystal display panel, A lenticular lens layer positioned on the second retardation film, A stereoscopic image conversion switch located on the lenticular lens layer; An upper polarizer positioned on the stereoscopic image conversion switch Liquid crystal display comprising a. In claim 1, And the first retardation film and the second retardation film each have an effect of phase retardation of 1/4 wavelength. In claim 1, The liquid crystal display panel is a transflective liquid crystal display device. In claim 3, The stereoscopic image conversion switch has an effect of phase delay of 1/2 wavelength, the liquid crystal display panel has an effect of phase delay of 1/2 wavelength in the transmission region, and the effect of phase delay of 1/4 wavelength in the reflection region. Liquid crystal display having a. In claim 1, When no voltage is applied to the liquid crystal display panel and the stereoscopic image switching switch, a planar image is realized. And a stereoscopic image when a voltage is applied to the liquid crystal display panel and the stereoscopic image conversion switch. In claim 4, The liquid crystal display panel Bottom substrate, A pixel electrode formed on the lower substrate, An upper substrate positioned opposite the lower substrate, A color filter and a common electrode formed under the upper substrate; Liquid crystal layer formed between the pixel electrode and the common electrode Including; And the pixel electrode comprises a transmission electrode and a reflection electrode. In claim 1, The stereoscopic image conversion switch is Switching bottom electrode, A switching top electrode opposite the switching bottom electrode, A switching liquid crystal layer formed between the switching upper electrode and the switching lower electrode Liquid crystal display comprising a. In claim 1, The lenticular lens layer includes a lenticular lens having refractive index anisotropy and a polymer layer having refractive index isotropy. In claim 8, And at least four subpixels corresponding to each lens of the lenticular lens layer when the pixel is formed of a subpixel of a red, green, and blue filter. In claim 1, The first retardation film and the lower polarizing plate are integrated.