JP2840012B2 - 3D display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional display device capable of reproducing a three-dimensional image without requiring special glasses.

[0002]

2. Description of the Related Art As a conventional technique, a three-dimensional (3D) lens using a lenticular lens capable of viewing a stereoscopic image without glasses is used.
D) Displays are known. In particular, the alignment between the lenticular lens and the display pixel is easy, and the distance between the display surface and the lenticular lens is short.

Next, as a conventional technique, an example of a direct-view type 3D display device in which a lenticular lens is directly attached to a liquid crystal panel display surface will be described.

[0004] One cylindrical lens corresponds to one set of a plurality of pixels of the liquid crystal panel on which different parallax images are displayed. Due to the function of the cylindrical lens, each parallax image is separately collected in a display space having an observation area. The observer can observe a stereoscopic image by placing the right eye and the left eye in a display space where different parallax images are collected, and viewing the different parallax images with the right eye and the left eye.

FIG. 9A is a plan view of a liquid crystal panel 91.
FIG. 9B shows the liquid crystal panel 91 shown in FIG.
Is a sectional view of the lenticular lens 92 corresponding to FIG.

FIG. 9 shows a case of a twin-lens system. LCD panel 1
Scans in the vertical direction so that the main scanning line coincides with the longitudinal direction of the cylindrical lens in the lenticular lens. A right-eye image and a left-eye image are interwoven and displayed every other main scanning line. That is, (1), (3), (5),
(7),..., Etc., the right-eye image is on the odd-numbered horizontal scanning lines, and the left-eye image is on the even-numbered scanning lines, such as (2), (4), (6), (8),. Image is displayed.

[0007] The projection image of the left-eye image shown in FIG. 10A is placed next to the space having an observation area by the action of the lenticular lens 92 attached to the front surface of the liquid crystal panel 91. A projected image of the right-eye image shown in FIG. 10B is presented.

When a DC voltage is continuously applied to the liquid crystal panel, the liquid crystal molecules undergo electrolysis and eventually stop operating. Therefore, an AC voltage is usually applied to the liquid crystal panel. There are two AC voltage application methods as shown in FIG. FIG. 11A shows a line inversion method,
FIG. 11B shows a frame inversion method.

The line inversion method shown in FIG.
A positive / negative voltage is applied for each line (one horizontal period). On the other hand, the frame inversion method shown in FIG.
A positive / negative voltage is applied for each frame (one vertical period).

[0010]

As described above, in the prior art, the polarity inversion of the frame inversion method or the line inversion method is performed. In the case of the frame inversion method, the left-eye image (FIG. 10A) and the right-eye image (FIG. 10B) projected onto the stereoscopic observation space are driven by the same polarity voltage (positive or negative). Then, in the next frame, the left-eye image and the right-eye image are driven by a voltage (negative or positive) having a polarity opposite to the previous polarity.

The left-eye image and the right-eye image are always driven with the same polarity instantaneously. However, when the temporal change is observed, the polarity of the left-eye image and the right-eye image is repeatedly inverted for each frame. There is a slight difference in voltage setting due to the difference in polarity,
As a result, a flicker phenomenon (flicker in which light and dark are repeated periodically) appears.

In the case of the line inversion method, a left-eye image (FIG. 1) projected onto a stereoscopic observation space at a frame at a certain time.
0 (a)) is driven with the same polarity for all lines. On the other hand, the right-eye image (FIG. 10B) is also driven with the same polarity for all lines. However, the polarities of the left-eye image and the right-eye image are different. Since the polarity of both the left-eye image and the right-eye image is reversed in the next frame, the polarity of the applied voltage of the left-eye image and that of the right-eye image are different in the next frame.

Therefore, since the polarity of the applied voltage differs between the left-eye image and the right-eye image in the frame at the same time, a difference occurs in the brightness between the left-eye image and the right-eye image. However, there is a problem that images having different brightnesses are presented and the feeling of fatigue increases.

SUMMARY OF THE INVENTION In view of the above-mentioned problems in the prior art, an object of the present invention is to temporally convert a left-eye image and a right-eye image into images.
Another object of the present invention is to provide a three-dimensional display device that can generate an image in which there is no change in brightness between the images, has less fatigue, and enables high-quality stereoscopic viewing.

[0015]

SUMMARY OF THE INVENTION An object of the present invention is to provide a display means for simultaneously displaying a predetermined number of different parallax images, and an optical means comprising an array of cylindrical lenses provided in a longitudinal direction in a vertical direction. The display means comprises:
The scanning line is vertically scanned so that the main scanning line of the display means and the longitudinal direction of the cylindrical lens coincide with each other, the polarity of the applied voltage is inverted every predetermined number of main scanning lines, and each main scanning line is scanned in the next frame. This is achieved by a three-dimensional display device that repeats applying a voltage of the opposite polarity applied in the previous frame line by line.

When the predetermined number of different parallax images is an odd number, the display means of the present invention inverts the polarity of the main scanning lines one by one.
In the next frame, the application of the voltage of the opposite polarity applied in the previous frame to each main scanning line may be repeated.

[0017]

In the three-dimensional display device according to the present invention, the display means and the optical means are placed so that the main scanning line of the display means coincides with the longitudinal direction of the cylindrical lens in the optical means, and a predetermined number of different parallax images are displayed on the display means. At the same time, every other main scanning line is displayed, and one set of the main scanning lines in the optical means for one set of a predetermined number of main scanning lines.
One cylindrical lens is made to correspond. The polarity of the main scanning line of the display means is inverted every predetermined number. The light emitted from the display means is separated for each parallax image by the function of the optical means, and different parallax images are projected to different spaces. The projected image becomes an image of a pattern in which the polarity is inverted for each main scanning line, and further becomes an image of a pattern which is inverted from the previous pattern in the next frame.

When the number of parallax images is odd, the polarity of the main scanning lines of the display means is inverted for each line. The image separated and projected by the optical means is an image of a pattern in which the polarity is inverted for each main scanning line, and in the next frame, an image of a pattern which is inverted from the previous pattern.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a three-dimensional display device according to the present invention will be described below with reference to the drawings.

FIG. 1A is a structural plan view of a liquid crystal panel 1 as a display means used in a three-dimensional (3D) display device of the present invention, and FIG. 1B is a plan view of a lenticular lens 2 as an optical means. The structural plan views are respectively shown. An example of a binocular system is shown.

FIG. 1A shows a display state of the liquid crystal panel 1 during a certain vertical scanning period. A main scanning line to which a positive electrode is applied is indicated by a solid line, and a main scanning line to which a negative electrode is applied is indicated by a dotted line. Each is shown. The first main scan line, the third main line, the fifth main line,
… Indicates that part of the image for the right eye is the second, fourth, sixth,
.. Indicate a part of the left-eye image.

The number of parallax images displayed on the liquid crystal panel is N
In the case of (N-eye type), a part of a certain parallax image is displayed on the liquid crystal panel 1 at every N main scanning lines. Further, a part of another parallax image is displayed every other N lines next to the main scanning line.
In this way, the N parallax images are cut and woven in order, and are simultaneously displayed.

First, a direct-view 3D display device in which a lenticular lens is directly adhered to the liquid crystal panel display surface will be described.

FIG. 2 is a sectional view showing the structure of a direct-view lenticular type binocular 3D display device.

A part of the parallax image corresponding to the left eye (hereinafter referred to as a left-eye image) corresponds to the display pixel Di1 of the liquid crystal panel 1, and a part of the parallax image corresponding to the right eye (hereinafter referred to as the right-eye image) corresponds to the display pixel Di2. Is displayed. A cylindrical lens Li is arranged corresponding to a pair of display pixels Di1 and Di2.

Light transmitted through the display pixels Di1 and Di2 is
By the operation of the cylindrical lens Li, the light is separated into a display space P and a display space Q in the observation region. This is the same for the values of the variable i from 1 to n. The left-view image is collected in the display space P and the right-view image is collected in the display space Q. When a left eye and a right eye are brought to the display space P and the display space Q, a stereoscopic image can be observed.

The lenticular lens 2 is an array of cylindrical lenses. Usually lenticular lens 2
Is made of a plastic material such as acrylic or vinyl chloride.

The liquid crystal panel 1 is placed at a vertical position such that the main scanning line coincides with the longitudinal direction of the cylindrical lens in the lenticular lens 2.

Displaying different parallax image information for each main scanning line can be achieved by switching the signal source for each main scanning line.
Signal processing is simplified. Therefore, it is often used in this posture.

Next, a case where the number N of parallax images is an even number will be described. In this embodiment, the polarity of the applied voltage of the main scanning line of the liquid crystal panel is inverted every N lines.

FIG. 1 shows a binocular 3D display device, so that one cylindrical lens corresponds to two main scanning lines. In the case of the N-eye type, one cylindrical lens corresponds to N main scanning lines.

FIG. 3 shows a polarity inversion method according to this embodiment.
In the case of the two-lens system (N-lens system), the polarity of the applied voltage is inverted every two main scanning lines (N lines). In a certain vertical scanning period (frame), the first and second main scanning lines are positive and
The fourth, fourth, negative, fifth, sixth, positive, seventh,
For the eighth line, a negative electrode and a drive voltage are applied. Further, in the next vertical scanning period, an applied voltage having a polarity opposite to that in the previous vertical scanning period is applied to the same main scanning line. That is, the first one,
A driving voltage is applied to the second negative electrode, a third positive electrode, a fourth positive electrode, a fifth positive electrode, a sixth negative electrode, a seventh positive electrode, and a eighth positive electrode.

FIG. 4 shows an image for the left eye (FIG. 4A) and an image for the right eye (FIG. 4B) in the state of FIG. 1 separated and projected by the action of the lenticular lens 2. . The main scanning line to which the positive electrode is applied is shown by a solid line as in FIG.
The main scanning line to which the negative electrode is applied is indicated by a dotted line.

As shown in FIGS. 3 and 4, in the left-eye image and the right-eye image, main scanning lines having different polarities are alternately mixed in one image, and one image has one main scanning line having the same polarity. It does not consist of scanning lines. Also,
Looking at the temporal change, the polarity of each main scanning line is inverted every vertical scanning period, and a voltage of the same polarity is not always applied.

In this embodiment, the phase of the main scanning line corresponding to the cylindrical lens and displaying the parallax image periodically, and
The phase of the polarity of the main scanning line does not need to coincide with the phase for periodically inverting the polarity.

Next, as an example of a case where the number N of parallax images (N-eye type) is an odd number, a case of a three-eye type will be described.

FIG. 5A shows a display state of the liquid crystal panel 1 during a certain vertical scanning period. A main scanning line to which a positive electrode is applied is shown by a solid line, and a main scanning line to which a negative electrode is applied is shown by a dotted line. Is shown. The first, fourth, seventh,... Main scanning lines are part of the parallax image C, and the second, fifth, eighth,.
Are the third, sixth, ninth,... Parts of the parallax image A are displayed. FIG. 5B is a cross-sectional view of the lenticular lens 2 placed on the front surface of the liquid crystal panel 1. In FIG. 5, since the three-lens system is shown, one cylindrical lens corresponds to three main scanning lines.

FIG. 6 shows a polarity inversion pattern when N is an odd number. The polarity of the applied voltage is inverted for each main scanning line. In a certain vertical scanning period (frame), the first, third, fifth,...
In the first,..., A negative drive voltage is applied. Further, in the next vertical scanning period, an applied voltage having a polarity opposite to that in the previous vertical scanning period is applied to the same main scanning line. That is, 1
The third, fifth,... Are negative electrodes, second, fourth,
For the sixth line,..., A positive drive voltage is applied.

FIG. 7 shows a parallax image A separated and projected by the action of the lenticular lens 2 in the state of FIG.
(FIG. 7A), disparity image B (FIG. 7B), disparity image C
(FIG. 7 (c)) is shown. Similar to FIG. 5, a main scanning line to which a positive electrode is applied is indicated by a solid line, and a main scanning line to which a negative electrode is applied is indicated by a dotted line.

As shown in FIGS. 6 and 7, in the parallax image A, the parallax image B, and the parallax image C, main scanning lines having different polarities are alternately mixed in one image, and one image is formed. It does not consist of one main scanning line of the same polarity. Looking at the temporal change, the polarity of each main scanning line is inverted every vertical scanning period, and a voltage of the same polarity is not always applied.

Even when the number of parallax images is an odd number other than 3, a similar effect can be obtained by inverting the polarity of every other main scanning line.

When the number N of parallax images is an odd number, similar results can be obtained by inverting the polarity of the applied voltage for every N main scanning lines as in the case of the even number.

The present invention can be applied to a projection type three-dimensional display device.

FIG. 8 is a structural sectional view of a projection type three-dimensional display device.

In the projection type three-dimensional display device shown in FIG. 8, light emitted from the light source 21 is collected by the condenser lens 23 and made incident on the liquid crystal panel 1. The incident light is
Light modulated by the liquid crystal panel 1 and transmitted through the liquid crystal panel 1 is imaged by the projection lens 22 on the diffusion layer 20 b in the lenticular screen 20. The image displayed on the liquid crystal panel 1 is enlarged and the diffusion layer 2 of the lenticular screen 20 is enlarged.
0b.

The lenticular screen 20 comprises an array 20a of cylindrical lenses and a diffusion layer 20b.

The projection type is different from the direct-view type only in that the projection lens 22 is inserted between the liquid crystal panel 1 and the lenticular lens 20, and there is no essential difference in basic functions.

In the projection type, similarly to the direct-viewing type, when the liquid crystal panel 1 is placed in a vertical position and the number N of parallax images is an even number, the polarity of the applied voltage is inverted every N main scanning lines. When the number is odd, the inversion is performed every main scanning line or every N main scanning lines. Then, the same effect as that of the direct-view type appears.

As described above, according to the three-dimensional display device of the present invention, the plurality of parallax images reproduced and projected in the stereoscopic observation space are subjected to main scanning in which voltages having different polarities are applied in the respective images. The lines are alternately mixed, and one image is not composed of main scanning lines having the same polarity on one surface.
That is, there is a slight voltage setting due to the difference in polarity, and even if there is a difference in brightness due to the difference in polarity, since it is averaged spatially and temporally, it is incident on the flicker phenomenon and the right eye and left eye. There is no difference in the brightness of the parallax images. When focusing on one main scanning line, the polarity is inverted every vertical scanning period (frame), so that electrolysis of liquid crystal molecules can be suppressed, which is effective in extending the life of the liquid crystal panel.

[0050]

The three-dimensional display device according to the present invention comprises a display means for simultaneously displaying a predetermined number of different parallax images, and an optical means comprising an array of cylindrical lenses provided in a longitudinal direction in a vertical direction. The display unit scans the scanning line in the vertical direction so that the main scanning line of the display unit and the longitudinal direction of the cylindrical lens coincide with each other, and inverts the polarity of the applied voltage every predetermined number of main scanning lines, In addition, since the application of the voltage of the opposite polarity applied in the previous frame for each main scanning line in the next frame is repeated, a high-quality three-dimensional display device with less feeling of fatigue can be provided.

In the three-dimensional display device according to the present invention, when the predetermined number of different parallax images is an odd number, the display means inverts the polarity of each main scanning line one by one, and outputs the main scanning line for each main scanning line in the next frame. Since the application of the opposite polarity voltage applied in the previous frame is repeated, it is possible to provide a high-quality three-dimensional display device with less feeling of fatigue.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a configuration of a two-lens three-dimensional display device which is one embodiment of a three-dimensional display device of the present invention.

FIG. 2 is a structural sectional view of a three-dimensional display device having the configuration of FIG. 1;

FIG. 3 is an explanatory diagram showing a polarity inversion pattern of the liquid crystal panel of FIG. 1;

FIG. 4 is an explanatory diagram of a left-eye image projected on the left eye and a right-eye image projected on the right eye from the liquid crystal panel of FIG. 1;

FIG. 5 is a schematic configuration diagram illustrating a configuration of a three-lens three-dimensional display device that is another embodiment of the three-dimensional display device of the present invention.

FIG. 6 is an explanatory diagram of a polarity inversion pattern of the liquid crystal panel of FIG. 5;

7 is an explanatory diagram of a parallax image A, a parallax image B, and a parallax image C projected from the liquid crystal panel of FIG.

FIG. 8 is a schematic configuration diagram showing a basic structure of another embodiment of the three-dimensional display device of the present invention.

FIG. 9 is a schematic configuration diagram showing one configuration example of a conventional two-lens three-dimensional display device.

10 is an explanatory diagram of a left-eye image projected on the left eye and a right-eye image projected on the right eye from the liquid crystal panel of FIG. 9;

FIG. 11 is an explanatory diagram of a conventional line inversion method and a frame inversion method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal panel 2 Lenticular lens 20 Lenticular screen 21 Light source 22 Projection lens 23 Condensing lens

Claims (2)

(57) [Claims] 1. A display device comprising: a display unit on which a predetermined number of different parallax images are simultaneously displayed; and an optical unit comprising an array of cylindrical lenses having a longitudinal direction provided in a vertical direction. The main scanning line of the display means is scanned in the vertical direction so that the longitudinal direction of the cylindrical lens coincides, the polarity of the applied voltage is inverted for the predetermined number of main scanning lines, and the next A three-dimensional display device wherein a voltage of the opposite polarity applied in a previous frame is repeatedly applied to each main scanning line in a frame. 2. The display device according to claim 1, wherein when the predetermined number of different parallax images is an odd number, the polarity of the main scanning lines is inverted for each main scanning line, and a next frame is provided for each main scanning line. 2. The three-dimensional display device according to claim 1, wherein the application of the voltage of the opposite polarity applied in step (1) is repeated.