KR20140085338A - 3D Display and Driving Method of Display - Google Patents

Abstract

A method of driving a 3D display and a display capable of increasing the number of viewpoints without reducing the resolution of the stereoscopic image in a spectacle-free 3D display is obtained.
A main display 10 for outputting the incident light as linearly polarized light and a main display 10 for outputting the outgoing light emitted from the main display 10 in a state in which the polarization state is maintained, A sub display 20 capable of switching to a driving speed of at least two times the driving speed of the lenticular lens 10 and a lenticular lens 30 for giving a different refractive index to the two kinds of linearly polarized lights emitted from the sub display 20 .

Description

[0001] The present invention relates to a 3D display and a driving method,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

BACKGROUND ART [0002] Conventionally, as a 3D display, a spectacle method and a non-spectacle method are known. For example, there is known a shutter glasses system in which a right eye image and a left eye image are switched and displayed at a high speed in the eyeglass system, and the glasses are intercepted from each other in synchronism with each other to generate parallax.

As another spectacle method, there is known a circularly polarized spectacle system using a polarizing filter which passes only circularly polarized light in a specific rotation direction and removes counter-rotating circularly polarized light, as shown in Fig. In addition, as shown in Fig. 6, there is known an active retarder method for temporally switching the amplitude direction of linearly polarized light.

On the other hand, in the non-eyeglass system, there is known a parallax barrier system which creates a binocular parallax by forming a shield plate provided with grooves in front of the display for each two pixels. In addition, a lenticular lens system in which a binocular parallax is produced by disposing a lenticular lens in a shape (in the form of an acicular shape) connected to a thin semicylinder in front of a display in another non-eyeglass system is known.

7 illustrates a 3D display using a lenticular lens system. In Fig. 7, the lenticular lens is optically isotropic. Fig. 7 shows a case where the number of viewpoints (to be described later) is one.

Patent Document 1: Japanese Patent Application Laid-Open No. 2003-158752

However, the prior art has the following problems.

In glasses-based 3D displays, there is a problem that dedicated glasses must be used in each mode. The reason for this problem is that there is a principle restriction that the image entering the right and left eyes is changed by glasses.

Further, in the shutter glasses type 3D display, there is a problem that the weight of the glasses becomes heavy and the cost increases. The reason for this problem is that it is necessary to attach a driving circuit to the spectacles as a mechanism for operating the shutter.

Also, in the parallax barrier type 3D display, there is a problem that the luminance is lowered (the image becomes darker) as compared with the 3D display of the lenticular lens type. The reason for this problem is that there is a fundamental restriction that it is necessary to provide a barrier (shielding plate) between the light source and the eye.

Further, in the non-eyeglass type 3D display, there is a problem that the area (the number of viewpoints, the number of viewpoints) in which the 3D image can be visually confirmed visually is limited. The reason for this problem is that there is a principle restriction that the point to which the 3D image is focused is limited to, for example, the front.

Furthermore, in order to solve this problem, there is a problem that the resolution of the 3D spatial image is reduced to 1 / r when a measure for increasing the number of viewpoints (r) is taken (for example, see Patent Document 1). The reason for this problem in the non-eyeglass type 3D display is that the number of pixels equal to the number of viewpoints r must be set to one set.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a 3D display and a display driving method capable of increasing the number of viewpoints without lowering the resolution of a stereoscopic image (3D spatial image) .

A 3D display according to the present invention includes: a main display for emitting incident light as linearly polarized light; A subdisplay capable of switching the emission light emitted from the main display to a driving speed at least twice the driving speed of the main display whether to output the polarization maintaining state or the polarization direction by 90 degrees; And a lenticular lens that gives different refractive indices to the two types of linearly polarized light emitted from the sub display.

According to another aspect of the present invention, there is provided a display driving method including: a first polarization step of emitting incident light as linearly polarized light; A second polarization step of switching the outgoing light emitted from the first polarization step to be emitted in a state in which the polarization state is maintained or in which the polarization direction is rotated by 90 degrees to a speed at least twice as fast as the first polarization step; And an image forming step of refracting the two types of linearly polarized light emitted from the second polarizing step at different refractive indexes to form an image at different positions.

According to the 3D display according to the present invention, the main display outputs the incident light as linearly polarized light, and the sub display displays the outgoing light emitted from the main display in a state of maintaining the polarization state or rotating the polarization direction by 90 degrees And the lenticular lens refracts the two types of linearly polarized lights emitted from the sub display to different refractive indexes.

According to the display driving method of the present invention, the first polarizing step emits the incident light as linearly polarized light, and the second polarizing step emits the outgoing light emitted in the first polarizing step in a state of maintaining the polarization state The polarizing direction is rotated at 90 degrees and the polarizing direction is rotated 90 degrees and the polarizing direction is switched to a speed at least twice as fast as the first polarizing step and the image forming step refracts the two kinds of linearly polarized light emitted at the second polarizing step at different refractive indexes Position.

Thus, in the non-eyeglass 3D display, the number of viewpoints can be increased without lowering the resolution of the stereoscopic image.

1 is a configuration diagram showing a 3D display according to Embodiment 1 of the present invention.
2 is a configuration diagram showing a lenticular lens of a 3D display according to Embodiment 1 of the present invention.
3 is an explanatory view showing the operation of the 3D display (when the sub display is OFF) according to the first embodiment of the present invention.
4 is an explanatory view showing the operation of the 3D display (when the sub display is on) according to the first embodiment of the present invention.
5 is an explanatory diagram illustrating a 3D display of a circularly polarizing glasses system.
6 is an explanatory view illustrating an active retarder type 3D display.
7 is an explanatory diagram illustrating a 3D display of a lenticular lens system.

Hereinafter, preferred embodiments of a 3D display and a display driving method according to the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals.

≪ Embodiment 1 >

1 is a configuration diagram showing a 3D display 1 according to Embodiment 1 of the present invention. 1, the 3D display 1 is composed of a main display 10, a sub display 20 and a lenticular lens 30, and when viewed by an observer, the lenticular lens 30, the sub display 20, (10).

The main display 10 is, for example, a liquid crystal display (LCD) and emits incident light as linearly polarized light. In addition, the main display 10 is not limited to the LCD but may be any type of display, such as an organic EL display (OLED: Organic Light Emitting Display), that can output a linearly polarized light by attaching a polarizing plate.

The polarization direction of the outgoing light emitted from the main display 10 and the orientation direction (rubbing axis) of the incident-side substrate of the sub display 20 coincide with each other.

The sub display 20 is an LCD capable of high-speed driving. The sub display 20 emits the outgoing light emitted from the main display 10 with the voltage on / off maintained in the state of polarization, or a phase of (? / 2) (The polarization direction is rotated by 90 degrees) so as to switch the output.

Specifically, the sub display 20 is driven by a drive circuit (not shown) and operated at a drive speed two times or more higher than that of the main display 10. Further, the sub display 20 may be a nematic liquid crystal or a smectic liquid crystal (ferroelectric liquid crystal (FLC)). The electrode of the sub display 20 may be a front electrode or a pattern electrode.

Here, the two types of linearly polarized light emitted from the sub display 20 are incident on one of the X axis and the Y axis of the lenticular lens 30 in parallel.

The lenticular lens 30 is made of a liquid crystal material which is uniaxially oriented on either the X axis or the Y axis, and has a different refractive index, that is, birefringence (optical anisotropy) in the X axis and the Y axis. Further, the surface of the lenticular lens 30 is not planarized to diffuse the light in a plurality of directions.

Here, the lenticular lens 30 is formed of a birefringent material such as a liquid crystal polymer, and has a refractive index of ne in the major axis direction (e.g., X axis) and a refractive index of ne in the minor axis direction The refractive index is no.

Further, the lenticular lens 30 may be polymerized after alignment using a polymerizable liquid crystal, or a polymer liquid crystal may be used. The liquid crystal alignment method in the lenticular lens 30 may be a rubbing method, a photo alignment method, or a shearing method.

The main display 10, the sub display 20, and the lenticular lens 30 may be flexible.

Hereinafter, the operation of the 3D display 1 according to the first embodiment of the present invention will be described with reference to Figs. 3 and 4. Fig. Figure 3 shows the operation of the 3D display 1 when the sub display 20 is off and Figure 4 shows the operation of the 3D display 10 when the sub display 20 is on.

Here, the case where the sub-display 20 is a TN (Twisted Nematic) type LCD and the refractive index ne in the major axis direction of the lenticular lens 30 is larger than the uniaxial refractive index no (ne > no) .

3, when the sub display 20 is off, the oscillation direction of the outgoing light (linearly polarized light) emitted from the main display 10 is rotated by 90 degrees in the sub display 20. Therefore, the direction of polarization of the polarized light emitted from the sub display 20 coincides with the direction of the long axis of the lenticular lens 30, and the light passing through the lenticular lens 30 is refracted at the refractive index ne.

4, when the sub display 20 is on, the direction of oscillation of the outgoing light (linearly polarized light) emitted from the main display 10 does not change even though it passes through the sub display 20 because the liquid crystal is standing . Therefore, the direction of polarization of the polarized light emitted from the sub display 20 coincides with the minor axis direction of the lenticular lens 30, and the light passing through the lenticular lens 30 is refracted at the refractive index no.

In this case, since ne> no in the case where the sub display 20 is off (in the case of FIG. 3) and when the sub display 20 is on (in the case of FIG. 4), it passes through the lenticular lens 30 One image is formed at a position close to the lenticular lens 30 (L1 < L2) than the light passing through the lenticular lens 30 in Fig.

That is, by switching the sub display 20, the image forming position of the light emitted from the lenticular lens 30 can be changed.

At this time, when the sub display 20 is driven at a high driving speed (for example 120 Hz = 1/120 s) twice the driving speed of the main display 10 (for example, 60 Hz = 1/60 s) The state shown in Fig. 3 and the state shown in Fig. 4 are switched at high speed.

As a result, the observer can view the 3D image at both the imaging position in Fig. 3 and the imaging position in Fig. That is, the number of viewpoints can be increased without lowering the resolution of the 3D image (spatial image). Specifically, in this example, the number of viewpoints can be doubled.

As described above, according to Embodiment 1, the main display outputs the incident light as linearly polarized light, and the sub display displays the outgoing light emitted from the main display in a state of maintaining the polarization state or rotating the polarization direction by 90 degrees And the lenticular lens refracts the two types of linearly polarized light emitted from the sub display to different refractive indexes.

Therefore, in the non-eyeglass 3D display, the number of viewpoints can be increased without lowering the resolution of the stereoscopic image.

Since the sub-display is an LCD, it is not necessary to install a new manufacturing facility since the sub-display can be manufactured in the same process as the main display.

Further, by constituting the lenticular lens with a uniaxially oriented liquid crystalline material, it is possible to image two kinds of linearly polarized lights emitted from the sub display at different focus positions, and to increase the number of viewpoints.

1: 3D display
10: Main display
20: Sub display
30: Lenticular lens

Claims (4)

A main display which emits incident light as linearly polarized light,
A subdisplay capable of switching the output light emitted from the main display to a driving speed at least two times the driving speed of the main display whether to output the polarization maintaining state or the polarization direction by 90 degrees,
And a lenticular lens which gives different refractive indices to the two types of linearly polarized light emitted from the sub display.
The method of claim 1, wherein
Wherein the sub display is a liquid crystal display.
The method according to claim 1 or 2, wherein
Wherein the lenticular lens is composed of a uniaxially oriented liquid crystal material.
A first polarization step of outputting the incident light as linearly polarized light,
A second polarization step of switching the output light emitted from the first polarization step to be emitted at a state of maintaining the polarization state or rotating the polarization direction by 90 degrees at a speed of twice or more than that of the first polarization step ,
And an image forming step of refracting the two types of linearly polarized light emitted from the second polarizing step at different refractive indexes to form an image at different positions.

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