JPH0792425A - Three-dimensional display device without spectacles - Google Patents

Abstract

PURPOSE:To provide a three-dimensional display device without spectacles capable of enhancing resolution at the time of switching to a planar display. CONSTITUTION:The three-dimensional display device without the spectacles is constituted so that a lenticular lens 3 arranged in front of a liquid crystal panel 1 is provided so as to turn around the center axis line by 90 deg. and a driving device 4 rotationally driving the lenticular lens 3 is provided as well. At the time of viewing a stereoscopic image, the lenticular lens 3 is turned into a direction where each lens is horizontally arranged. Moreover, at the time of viewing a planar image, the lenticular lens 3 is turned by 90 deg. into the direction where each lens is vertically arranged, not to separate an image for both eyes in a horizontal line direction. Thus, a display by all picture elements is executed to enhance the resolution.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereoscopic display device without glasses, and more particularly, to a stereoscopic display device without glasses that can improve the resolution when switching to flat display.

[0002]

2. Description of the Related Art In a stereoscopic display device without glasses, for example, as shown in FIG. 1, a lenticular lens 13 having two horizontal pixels at one pitch is attached to the front of a liquid crystal panel 1 arranged on the front of the display. , The right-eye image R and the left-eye image L are alternately formed for each pixel in the horizontal direction, and the right-eye image R is viewed by the right eye and the left-eye image L is viewed by the left eye from the front of the display device. The image with a stereoscopic effect due to the parallax is visible.

[0003]

In this stereoscopic display device without glasses, the image of the liquid crystal panel is seen by the lenticular lens 13 separately for each pitch of the lenticular lens 13, so that the right eye and the left eye can be seen separately. When viewing an image, the number of pixels of the image viewed by each of the left and right eyes is ½ of the total number of images, and there is a problem that the resolution is reduced.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a stereoscopic display device without glasses capable of increasing the resolution when switching to the flat display.

[0005]

In order to achieve the above object, the present invention is characterized in that a lens rotating device for rotating a lenticular lens arranged on the front surface of a display device by 90 ° around a central axis is provided. And

[0006]

When the stereoscopic image is viewed, the lenticular lenses are oriented in the direction in which the lenses are arranged side by side like a normal stereoscopic display device without glasses, and when the planar image is viewed, the lenticular lens is rotated by 90 °. Orient the lenticular lens in the direction in which the lenses are arranged vertically, and the separation of the left and right eye images in the horizontal line direction is eliminated.

When the plane image is viewed, the image is vertically separated by the lenticular lens. Generally, however, the pixel pitch of a display device such as a liquid crystal panel is different in the vertical direction and the horizontal direction, so that each pixel is separated. It is not separated into upper and lower parts, and the deterioration of resolution is very small.

In the present invention, as the lenticular lens, a flat plate microlens having a lens function by generating a refractive index distribution in a glass substrate can be used. In this case, surface precision, strength, etc. are conventionally used. Since it is superior to the resin lenticular lens that is used,
This is advantageous in providing a rotating mechanism.

Moreover, since the flat plate microlens does not disturb the polarized light, there is a gap between the liquid crystal panel, the front panel and the polarizing plate.
Since it is possible to arrange a flat micro lens, it is possible to shorten the distance between the pixel and the lenticular lens. Therefore, in a panel with a very fine pixel pitch such as a liquid crystal panel, the appropriate viewing distance in stereoscopic viewing is shortened. Is possible, which is advantageous especially in the case of a small liquid crystal panel.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A stereoscopic display device without glasses according to an embodiment of the present invention will be specifically described below with reference to the drawings. In these drawings, the structure for forming an image on a liquid crystal panel as a display device is as follows. It is omitted because it is not directly related to the essence of the present invention.

As shown in the perspective view of FIG. 2 and the exploded perspective view of FIG. 3, the stereoscopic display device without glasses includes a liquid crystal panel 1.
A lenticular lens 3 arranged on the front surface of the display unit 2 of the liquid crystal panel 1, a jig 3a for holding the lenticular lens 3, and a front surface of the lenticular lens 3 in front of the display unit 2. The output side polarizing plate 4 is provided.

As shown in the perspective view of FIG. 4, the lenticular lens 3 is not particularly limited, but it has a lens function by generating a kamaboko-shaped refractive index distribution factor in a glass substrate by ion exchange. Flat microlenses are used.

The shape of the peripheral edge of the lenticular lens 3 is not particularly limited, but is formed in a circular shape on the surface of the liquid crystal panel 1 so that the lenticular lens 3 can easily rotate around the central axes of the liquid crystal panel 1 and the lenticular lens 3. The periphery thereof is held by a jig 3a formed in an annular shape having an inner diameter larger than the diagonal line of the liquid crystal panel 1.

The jig 3a and the lenticular lens 3
Is supported in the stereoscopic display device without glasses so as to be rotatable around the central optical axis of the lenticular lens 3 which is concentric with the central optical axes of the liquid crystal panel 1 and the exit side polarizing plate 4.

The structure for rotatably supporting the jig 3a and the lenticular lens 3 is not particularly limited. For example, as shown in the structural diagram of FIG. 5, a large gear 5a is formed on the peripheral surface of the jig 3a. The jig 3a and the lenticular lens 3 may be supported by the three small gears 5b to 5d arranged at equal intervals in the circumferential direction.

In this stereoscopic display device without glasses,
A driving device 5 for driving the jig 3a and the lenticular lens 3 to reciprocally rotate 90 ° is provided. This drive 5
May be configured so that the jig 3a and the lenticular lens 3 can be driven to rotate. For example, as shown in FIG. 5, the large gear 5a and at least one of the small gears 5b to 5d are provided. , And an actuator 5e for driving at least one of the small gears 5b to 5d.

In this embodiment, a motor is used as the actuator 5e, but a rack (tooth row) that meshes with the large gear 5a is provided instead of the at least one small gear 5b to 5d, and a linear gear for advancing and retracting the rack is provided. It is possible to configure the actuator with a solenoid.

Further, in the above drive device, a large gear including a bevel gear and a helical gear is provided on the end surface of the jig 3a, and a small gear including a bevel gear and a helical gear are meshed with each other.
It is possible to provide an actuator including a motor that rotationally drives the small gear.

Further, the power transmission between the jig 3a and the actuator 5e may be interlockingly connected by using, for example, a friction wheel, a belt, a chain or the like instead of the gear mechanism.

In addition, it is possible to directly connect an actuator composed of a rotary solenoid to the jig 3a and drive the jig 3a directly by the actuator.

In the above structure, when observing a stereoscopic image, each lens of the lenticular lens 3 is arranged in parallel with the vertical stripe of the liquid crystal panel 1 as shown in FIGS. At this time, the positional relationship between the pixels of the liquid crystal panel 1 and the lenticular lens is as shown in FIG.
The image formed on the liquid crystal panel 1 is separated into the left eye and the right eye, and the stereoscopic effect of the image can be obtained by viewing these with the left and right eyes.

In this stereoscopic display device without glasses, when a normal plane image is viewed, the driving device 5 is operated to rotate the jig 3a and the lenticular lens 3 by 90 °. At this time, an example of the positional relationship between the pixels of the liquid crystal panel 1 and the lenticular lens 3 is as shown in FIG.

That is, regarding the pixel pitch of the liquid crystal panel 1 of the stereoscopic display device without glasses, the pitch in the vertical direction (vertical direction) is more coarse than the pitch in the horizontal direction (horizontal direction). , The pitch of each lens of the lenticular lens 3 which is rotated by 90 ° and arranged vertically is not equal to the pitch of the pixels 2a to 2f arranged in the vertical direction.

As a result, the vertical separation by the lenticular lens 3 does not become the vertical separation for every other pixel, almost all the pixels can be confirmed through the lenticular lens 3, and the deterioration of the pixels hardly occurs. For example, in FIG. 6, all the pixels 2a to 2 from the upper and lower parts are separated.
It is possible to confirm f, and therefore, deterioration of pixels due to the lenticular lens does not occur.

By the way, as described above, in this embodiment, the flat plate microlens is used as the lenticular lens 3, but in the present invention, a conventional resin lenticular lens 13 is used as shown in FIG. It is possible.

In this case, the liquid crystal panel 11 has a front panel 11A and a rear panel 11B, and for each pixel 11a to 11p arranged in the horizontal direction of the liquid crystal panel 1, a pitch of one lens for every two pixels is provided. The lenticular lens 13 is disposed on the front surface of the liquid crystal panel 11.

The liquid crystal panel 11 has an incident side polarization plate 6 attached to the back surface thereof, and an emission side polarization plate 4 attached between the liquid crystal panel 11 and the lenticular lens 13 for polarization by the resin lenticular lens 13. I try to suppress the disturbance.

For this reason, this conventional resin lenticular lens 13 is disadvantageous in shortening the proper viewing distance, and particularly when the liquid crystal panel 11 having a fine pixel pitch is used, the optimum viewing distance is more optimal. It is disadvantageous in getting closer to the visual distance.

On the other hand, as in the above-described embodiment,
When the above-mentioned flat plate microlens is used as the lenticular lens 3, it is superior in surface accuracy, strength, etc. to the lenticular lens made of resin which has been frequently used in the related art, and therefore it is advantageous in providing a rotating mechanism.

Further, when the above-mentioned flat plate microlens is used as the lenticular lens 3, there is no fear that the lenticular lens 3 disturbs the polarization.
As shown in FIG. 3, an emission side polarizing plate is arranged on the front surface of the lenticular lens, and the lenticular lens 3 can be arranged so as to directly contact the liquid crystal panel 1, and the optimum viewing distance can be shortened. It becomes possible to optimize the viewing distance.

In FIG. 8, 2A is a front panel and 2A is a front panel.
B indicates the rear panels 2a to 2p, and each pixel.

Further, when moiré is observed when a planar image is viewed by rotating the lenticular lens 3 composed of a flat plate microlens by 90 °, the vertical pixel pitch of the liquid crystal panel is approximately an integer with respect to the horizontal pixel pitch. By doubling, the moire can be easily eliminated. For example, as shown in FIG. 6, the vertical pixel pitch is 3 with respect to the horizontal pixel pitch.
In the case of double, since exactly three lenticular lenses are arranged for two vertical pixels, in principle, there is no possibility of moire.

[0033]

As described above, according to the present invention, the lenticular lens arranged on the front surface of the display device is provided rotatably by 90 ° about the central axis, and the driving device for rotationally driving the lenticular lens. Is provided, it is possible to easily switch between stereoscopic display and planar display simply by rotating the lenticular lens by 90 ° with the drive device, and moreover, all pixels can be viewed during planar display, thus increasing the resolution. be able to.

In the present invention, particularly when the lenticular lens is composed of a flat plate microlens having a lens function by generating a refractive index distribution in a glass substrate, it has been widely used conventionally in surface accuracy, strength and the like. Since it is superior to existing resin lenticular lenses, it is advantageous in providing a rotation mechanism.

Further, in the case where the lenticular lens is composed of a flat plate microlens having a lens function by generating a refractive index distribution in the glass substrate, and the exit side polarization plate is arranged in front of the lenticular lens. In addition, it is possible to shorten the optimum viewing distance and to further optimize the optimum viewing distance.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of a stereoscopic display device without glasses.

FIG. 2 is a perspective view of an embodiment of the present invention.

FIG. 3 is an exploded perspective view of an embodiment of the present invention.

FIG. 4 is a perspective view of a lenticular lens according to an embodiment of the present invention.

FIG. 5 is a configuration diagram of an embodiment of the present invention.

FIG. 6 is a diagram illustrating the principle of flat display of an embodiment of the present invention.

FIG. 7 is a cross-sectional view of a main part of another embodiment of the present invention.

FIG. 8 is a transverse cross-sectional view of a main part of one embodiment of the present invention.

[Explanation of symbols]

 1 Liquid crystal panel 3 Lenticular lens 4 Emission side polarizing plate 5 Driving device

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[Procedure amendment]

[Submission date] August 11, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

Moreover, since the flat plate microlens does not disturb the polarized light, it becomes possible to dispose the flat plate microlens between the front panel of the liquid crystal panel and the polarizing plate, and the distance between the pixel and the lenticular lens can be shortened. ,
In a panel with a very fine pixel pitch such as a liquid crystal panel, it is possible to shorten the appropriate viewing distance in stereoscopic view compared to the configuration in which a lenticular lens is arranged above the polarizing plate, which is particularly advantageous for a small liquid crystal panel. Becomes

Claims (2)

[Claims] 1. A stereoscopic body without glasses characterized in that a lenticular lens arranged on the front surface of a display device is provided so as to be rotatable by 90 ° around a central axis, and a drive device for rotationally driving the lenticular lens is provided. Display device. 2. The lenticular lens is composed of a flat plate microlens having a lens function by generating a refractive index distribution in a glass substrate, and an emission side polarizing plate is arranged in front of the lenticular lens. The stereoscopic display device without glasses according to claim 1.