KR20150078196A - 2d/3d switching lens for three-dimensional image display device - Google Patents

Abstract

The present invention provides a flat panel display comprising: a top plate including a first film and a Fresnel lens portion formed on a lower surface of the first film, the Fresnel lens portion having a plurality of Fresnel lenses arranged in parallel in a transverse direction; A lower film comprising a second film and a lower alignment film formed on the upper surface of the second film; And a liquid crystal layer between the upper plate and the lower plate.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a 2D / 3D switching lens for a stereoscopic image display device,

The present invention relates to a 2D / 3D switching lens for a stereoscopic image display.

A stereoscopic display usually provides an observer with an image with a parallax from the respective left and right eye viewpoints. There are two methods of providing parallax images in both sides of the observer.

The first is to use a pair of shutters or 3D glasses that transmit or block light towards the viewer's eye by alternating and synchronizing the left / right image display.

In the second method, similarly to the above, the viewpoints of the right eye and the left eye are alternately displayed in each eye of the observer, but 3D glasses are not used. This second method is referred to as autostereoscopic and is desirable for stereoscopic 3D viewing because no separate glasses are required.

The non-eyeglass stereoscopic system includes a parallax barrier system and a lenticular lens system.

A liquid crystal display (LCD) displays a sample / hold display (sample) in which an image at any point or pixel of the display is stable until the pixel is updated at the next image refresh time, typically 1/60 second or faster and hold display devices. In such a sample-and-hold system, displaying different images, specifically displaying alternating left and right images for non-eyeglass stereoscopic display, may be useful, for example, so that the left eye image light source is not turned on during display of data for the right eye And vice versa, careful timing sequencing of the light sources is required.

Ensuring that the left and right light sources are turned on and off synchronously with the image display is important in achieving high-quality, non-eyeglass stereoscopic images.

On the other hand, the lenticular lens system is advantageous in terms of viewing angle and luminance in enlarging the display compared to the parallax barrier system. However, the lenticular lens system uses a large amount of liquid crystal compared to the parallax barrier system, and as the size of the display increases, the thickness of the lens becomes thick, which leads to an increase in the amount of the liquid crystal used and the orientation of the liquid crystal. Therefore, it is required to keep the performance of the existing lenticular lens, but to use a technology with a high degree of alignment with a small amount of liquid crystal used.

Korean Patent Publication No. 10-2010-0139017

SUMMARY OF THE INVENTION It is an object of the present invention to provide a 2D / 3D switching lens capable of providing a spectacle-free stereoscopic image.

Another object of the present invention is to provide a 2D / 3D switching lens in which the thickness of the liquid crystal layer is thin, the amount of liquid crystal used can be reduced, the cost is reduced, and the liquid crystal alignment property is improved.

According to the present invention,

A top film comprising a first film and a Fresnel lens portion formed on the bottom surface of the first film and having a plurality of Fresnel lenses arranged in parallel in a transverse direction;

A lower film comprising a second film and a lower alignment film formed on the upper surface of the second film; And

And a liquid crystal layer between the upper plate and the lower plate.

The 2D / 3D switching lens may have a feature that an orientation film is formed on the lower curved surface of the Fresnel lens portion.

The 2D / 3D switching lens further comprises a first transparent electrode between the bottom surface of the first film and the top surface of the Fresnel lens portion; And a second transparent electrode is further provided between the upper surface of the second film and the lower alignment film.

The 2D / 3D switching lens may have a characteristic that the liquid crystal contained in the liquid crystal layer is a cured reactive liquid crystal.

In the 2D / 3D switching lens, a polarizing switching unit is coupled to a lower plate,

An upper plate including a third film, a first electrode formed on a lower surface of the third film, and an upper alignment film formed on a lower surface of the first electrode;

A lower film comprising a fourth film, a second electrode formed on the upper surface of the fourth film, and a lower alignment film formed on the upper surface of the second electrode; And

And a liquid crystal layer between the upper plate and the lower plate.

The 2D / 3D switching lens of the present invention is provided with a Fresnel lens portion at a lower portion of the first film that is in contact with the liquid crystal, thereby reducing the thickness of the liquid crystal layer, thereby reducing the amount of liquid crystal used, thereby reducing cost and improving liquid crystal alignment do.

1 and 2 are perspective views showing the structure of a conventional 2D / 3D switching lens.
3 to 4 are perspective views showing an example of a 2D / 3D switching lens of the present invention.
Fig. 5 shows a conceptual view (a) of the Fresnel lens and a structure (b) of the Fresnel lens.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would unnecessarily obscure the gist of the present invention. Furthermore, in the following embodiments, unless individual components and functions are expressly required, they can generally be selected and the order of the processes can be changed. Portions and features of some embodiments may be included in other embodiments or may be replaced by other embodiments.

1 and 2 are perspective views showing the structure of a conventional 2D / 3D switching lens. As shown in FIG. 1, the conventional 2D / 3D switching lens is attached to the display panel 200 by the adhesive layer 300.

The 2D / 3D switching lens 100 of the present invention includes a top plate 110 and a bottom plate 120 which are bonded to each other.

The upper plate 110 includes a first film 111, a first transparent electrode 112 formed on a lower surface of the first film 111, a resin layer 113 formed on a lower surface of the first transparent electrode 112, An upper alignment layer 114 formed on the lower surface of the resin layer, and a liquid crystal 115 contacting the upper alignment layer 114.

The resin layer 113 has a plurality of lenticular lens patterns. The lower substrate 120 includes a second film 121, a second transparent electrode 122 formed on the upper surface of the second film 121, and a lower alignment film 123 formed on the upper surface of the second transparent electrode 122. [ .

The upper plate 110 and the lower plate 120 are joined together through a laminating process so that the liquid crystal 115 of the upper plate 110 and the lower alignment film 123 of the lower plate 120 are in direct contact with each other.

2, the conventional 2D / 3D switching lens includes an upper plate 110, a lower plate 120 coupled with the upper plate 110, a polarization switching unit 130, and the lower plate 120, And a pressure-sensitive adhesive layer 140 between the polarization switching part 130 and the pressure-sensitive adhesive layer 140.

The upper substrate 110 includes a first film 111, a resin layer 113 formed on the lower surface of the first film 111, an upper alignment layer 114 formed on the lower surface of the resin layer, And a cured reactive mesogen 116 in contact with the liquid. The resin layer 113 has a plurality of lenticular lens patterns.

The lower plate 120 includes a second film 121 and an upper alignment layer 123 formed on the upper surface of the second film 121.

The upper and lower substrates 110 and 120 are bonded together through a laminating process and the cured reactive liquid crystal 116 of the upper substrate 110 is in direct contact with the lower alignment film 123 of the lower substrate 120.

The polarization switching unit 130 attached to the lower plate 120 through the pressure sensitive adhesive layer 140 includes the third and fourth films 131 and 132 and the third and fourth films 131 and 132 First and second transparent electrodes 133 and 134 formed on the first and second transparent electrodes 133 and 134, upper and lower alignment films 135 and 136 respectively formed on the first and second transparent electrodes 133 and 134, And a liquid crystal 137 positioned between the orientation films 135 and 136.

The molecular direction of the liquid crystal 137 between the upper and lower alignment films 135 and 136 is determined by the upper and lower alignment films 135 and 136 as illustrated in FIG. As the electric field is applied between the first and second transparent electrodes 133 and 134, the molecular direction of the liquid crystal 137 changes as illustrated in FIG. 2, and as a result, the polarization switching unit 130 The polarization direction of one light is changed.

However, such a 2D / 3D switching lens has disadvantages in that when the display is enlarged, the thickness of the lens is increased, the amount of liquid crystal used increases, and the alignment of the liquid crystal is difficult.

The present invention is characterized in that a Fresnel lens element is employed in a 2D / 3D switching lens to solve the above problems.

Since the phase of light is periodically changed every 2 ?, it functions as the same convex lens by cutting out the point where the phase delay of the light by the lens is changed by 2? In the conventional convex lens form and transferring it to the plane. Such a lens is called a Fresnel lens, and FIGS. 5 (a) and 5 (b) show the concept of such a Fresnel lens. The Fresnel lens has an advantage that a thick thickness of a conventional convex lens can be formed in a thin shape. For the design of such a Fresnel lens, the height of the Fresnel lens according to the distance in the structure shown in FIG. 6 (b) is defined as follows:

In the above equation, m denotes the number of Fresnel zones, and f denotes the focal length of the Fresnel lens. If a liquid crystal lens is realized in the form of a Fresnel lens instead of a general GRIN lens type, it is possible to realize a short focus using a thin liquid crystal layer, which has advantages such as a low driving voltage, a fast response speed and a low chromatic aberration.

3 to 4 are perspective views showing an example of a 2D / 3D switching lens of the present invention.

3, the 2D / 3D switching lens of the present invention can be attached to the display panel 200 by a pressure-sensitive adhesive layer 300.

The 2D / 3D switching lens 100 includes a top plate 110 and a bottom plate 120 which are bonded to each other.

The upper plate 110 includes a first film 111, a first transparent electrode 112 formed on a lower surface of the first film 111, a resin layer 113 formed on a lower surface of the first transparent electrode 112, An upper alignment layer 114 formed on the lower surface of the resin layer, and a liquid crystal 115 contacting the upper alignment layer 114.

The resin layer 113 has a plurality of Fresnel lens patterns. The lower substrate 120 includes a second film 121, a second transparent electrode 122 formed on the upper surface of the second film 121, and a lower alignment film 123 formed on the upper surface of the second transparent electrode 122. [ .

The upper plate 110 and the lower plate 120 are joined together through a laminating process so that the liquid crystal 115 of the upper plate 110 and the lower alignment film 123 of the lower plate 120 are in direct contact with each other. The initial molecular direction of the liquid crystal 115 between the upper and lower alignment films 114 and 123 is determined by the alignment films 114 and 123 as illustrated in FIG. As the electric field is applied between the first and second transparent electrodes 112 and 122, the molecular direction of the liquid crystal 115 changes as illustrated in FIG. 2, so that the refractive index of the liquid crystal 115 . For example, mode switching to 3D can be performed by applying an electric field between the first and second transparent electrodes 112 and 122. [ The switching lens 100 according to the present invention functions as a lens for changing the path of the incident light so as to pass the incident light without changing the path in the 2D mode but to provide different two dimensional images in the left and right eyes under the 3D mode .

4, the 2D / 3D switching lens of the present invention includes an upper plate 110, a lower plate 120 coupled with the upper plate 110, a polarization switching unit 130, and the lower plate 120, And a pressure-sensitive adhesive layer 140 between the polarization switching parts 130.

The upper substrate 110 includes a first film 111, a resin layer 113 formed on the lower surface of the first film 111, an upper alignment layer 114 formed on the lower surface of the resin layer, And a cured reactive mesogen 116 in contact with the liquid. The resin layer 113 has a plurality of Fresnel lens patterns.

The lower plate 120 includes a second film 121 and a lower alignment film 123 formed on the upper surface of the second film 121.

The upper and lower substrates 110 and 120 are bonded together through a laminating process and the cured reactive liquid crystal 116 of the upper substrate 110 directly contacts the lower alignment film 123 of the lower substrate 120.

The polarization switching unit 130 attached to the lower plate 120 through the pressure sensitive adhesive layer 140 includes the third and fourth films 131 and 132 and the third and fourth films 131 and 132 First and second transparent electrodes 133 and 134 formed on the first and second transparent electrodes 133 and 134, upper and lower alignment films 135 and 136 respectively formed on the first and second transparent electrodes 133 and 134, And a liquid crystal 137 positioned between the orientation films 135 and 136.

The molecular direction of the liquid crystal 137 between the upper and lower orientation films 135 and 136 is determined by the orientation films 135 and 136 as illustrated in FIG. As the electric field is applied between the first and second transparent electrodes 133 and 134, the molecular direction of the liquid crystal 137 changes as illustrated in FIG. 2, and as a result, the polarization switching unit 130 The polarization direction of one light is changed.

That is, the polarizing direction of the light passing through the polarization switching unit 130 and the polarizing direction of the first and second transparent electrodes 133 and 134 (134, 134) in a state where no electric field is applied between the first and second transparent electrodes 133 and 134 The polarization direction of the light having passed through the polarization switching unit 130 is different from that of the polarized light, and the cured reactive liquid crystal 116 has a different refractive index with respect to the incident light having such different polarizing directions .

As a result, the switching lens 100 according to the second embodiment of the present invention passes the incident light as it is without changing the path in the 2D mode. However, in order to provide different two-dimensional images in the left and right eyes under the 3D mode, And functions as a lens for changing the position of the lens.

For example, mode switching to 3D can be performed by applying an electric field between the first and second transparent electrodes 133 and 134.

In the present invention, the display panel 200 may be a PDP panel, an LCD panel, or an OLED panel, which provides a 2D image under the 2D mode and a 3D image (a left eye image and a right eye image) under the 3D mode.

As the adhesive forming the pressure sensitive adhesive layer 300 for attaching the switching lens 100 and the display panel 200, for example, a transparent pressure sensitive adhesive may be preferably used.

The Fresnel lens in the present invention is not particularly limited as long as it is known in the art.

In the present invention, an upper alignment film formed on the inner surface of each Fresnel lens included in the resin layer 113 is not essential. This is because the orientation of the liquid crystal can be achieved even by rubbing the inner curved surface.

Since the thickness of the liquid crystal layer is small, the 2D / 3D switching lens of the above-described type has a small amount of liquid crystal to be used, thereby reducing the cost and improving the liquid crystal orientation.

In the present invention, a material such as a first film, a second film, a third film, a fourth film, an upper and a lower orientation film, a first transparent electrode, a second transparent electrode, a liquid crystal, etc. and a method of constructing a 2D / 3D switching lens Is not particularly limited and a technique known in the art can be applied.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It is to be understood that both the technical idea and the technical spirit of the invention are included in the scope of the present invention.

100: switching lens 110: top plate
111: first film 112: first transparent electrode
113: resin layer (Fresnel lens section) 114, 135: upper alignment film
115, 116, 137: liquid crystal 120: lower plate
121: second film 122: second transparent electrode
123, 136: lower alignment layer 130: polarization switching part
131: third film 132: fourth film
133: first transparent electrode 134: second transparent electrode
140, 300: pressure-sensitive adhesive layer 200: display panel

Claims (5)

A top film comprising a first film and a Fresnel lens portion formed on the bottom surface of the first film and having a plurality of Fresnel lenses arranged in parallel in a transverse direction;
A lower film comprising a second film and a lower alignment film formed on the upper surface of the second film; And
And a liquid crystal layer between the upper plate and the lower plate. The method according to claim 1,
Wherein the Fresnel lens portion has an orientation film formed on a lower curved surface of the 2D / 3D switching lens. The method according to claim 1,
A first transparent electrode is further provided between a lower end surface of the first film and a top surface of the Fresnel lens portion; And a second transparent electrode is further provided between the upper surface of the second film and the lower alignment film. The method according to claim 1,
Wherein the liquid crystal contained in the liquid crystal layer is a cured reactive liquid crystal. The method of claim 4,
The lower plate is coupled with a polarization switching section, and the polarization switching section
An upper plate including a third film, a first electrode formed on a lower surface of the third film, and an upper alignment film formed on a lower surface of the first electrode;
A lower film comprising a fourth film, a second electrode formed on the upper surface of the fourth film, and a lower alignment film formed on the upper surface of the second electrode; And
And a liquid crystal layer between the upper plate and the lower plate.

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