JP2003295115A - Stereoscopic image display device with no glasses - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stereoscopic image display device with which a stereoscopic image can be observed with no uncomfortable feeling by making interference fringes thin. <P>SOLUTION: This stereoscopic image display device with no glasses is provided with a liquid crystal display panel 2 for alternatively displaying an image for the left eye and an image for the right eye, and a parallax barrier 3 for separating image light from the liquid crystal display panel 2 in accordance with the left and right eyes. In the parallax barrier 3, the width of a shielding part 32a of the circumferential part of a display screen is narrower than the width of a shielding part 32a of the central part, thereby, setting a large aperture ratio of the circumferential part. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereoscopic image display device that does not use special glasses.

[0002]

2. Description of the Related Art In recent years, in the field of electronic display devices, technological progress has been remarkably advanced, and display screens are becoming larger and higher in definition. As the display screen becomes larger and finer, the proportion of the image in the human visual field on the display screen increases, and pixels can be arranged at a high density that cannot be discriminated by the resolution of human eyes. This makes the image look more like the real thing,
It will be natural and create a high sense of presence. However, such an image is two-dimensional, whereas an actual object is three-dimensional, and thus a two-dimensional image has a limit in obtaining a more realistic natural image.

By the way, a human being can see an object three-dimensionally by the action of two left and right eyes. Therefore, if objects can be displayed three-dimensionally, a higher sense of realism will be created. Therefore, in recent years, research on three-dimensional display of objects has been actively conducted.

Conventionally, various stereoscopic image display devices have been proposed. Among them, as a device for displaying stereoscopic images without special glasses, a device using an optical separation means such as a lenticular lens or a parallax barrier is proposed. Are known.
Japanese Unexamined Patent Publication No. 10-268232 proposes a stereoscopic image display device including a backlight, a liquid crystal display panel as a display panel, and a parallax barrier arranged on the viewer side of the liquid crystal display panel. ing.

As a parallax barrier type stereoscopic image display device, for example, as shown in FIG. 1, a backlight 1, a liquid crystal display panel 2 as a display panel, and a liquid crystal display panel 2 arranged on the observer side. The parallax barrier 3 is provided. The parallax barrier 3 is formed by forming a large number of stripe-shaped light shielding portions 32 on a transparent substrate 31 such as glass or transparent resin. In the liquid crystal display panel 2, a liquid crystal layer 23 is provided between the glass substrates 22 and 24. Further, the glass substrate 22 on the light emission side has an emission side polarization plate 21 and the glass substrate 24 on the light incidence side has an incidence side. Polarizing plates 25 are provided respectively. Then, the image for the right eye and the image for the left eye are alternately displayed on the liquid crystal layer 23 of the liquid crystal display panel 2. The image transmitted through the light from the backlight 1 is separated by the parallax barrier 3 and the left eye 1 of the observer
Only the image for the left eye is observed at 0L, and only the image for the right eye is observed at right eye 10R, and the stereoscopic image is recognized.

As the parallax barrier type stereoscopic display device, there is one provided in a liquid crystal display device 10 including a liquid crystal monitor as shown in FIG. The liquid crystal display device 10 accommodates the liquid crystal display panel 2 in a housing 12. A parallax barrier 3 is provided on the viewer-side display screen 11 of the liquid crystal display panel 2. Further, a leg portion 13 is attached to the housing 12, and the leg portion 13 allows the leg portion 13 to be installed on a desk or the like.

A video signal is given to the liquid crystal display device 10 from a personal computer (not shown) or the like, and a predetermined video image is displayed on the liquid crystal display panel 2. In the case of a stereoscopic image, an image according to the number of viewpoints is displayed. For example, in the case of a binocular system with two viewpoints, the left-eye image and the right-eye image are displayed alternately. Then, the parallax barrier 3 separates the left and right images to observe a stereoscopic image.

In such a system, in order to observe a clear stereoscopic image over the entire display screen, it is necessary to make the distance between the liquid crystal display panel 2 and the parallax barrier 3 uniform. The Lux barrier 3 is arranged in contact with each other.

[0009]

However, with the increase in screen size of the liquid crystal display device 10, the warp of the liquid crystal display panel 2 cannot be ignored. Due to the influence of this warpage, as shown in FIG. 3, interference fringes 21 are generated in the peripheral portion,
There was a feeling of strangeness.

The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a stereoscopic image display device in which interference fringes are thinned and stereoscopic vision can be observed without a sense of discomfort.

[0011]

A stereoscopic image display device without glasses of the present invention is a video display device for displaying a video image from a plurality of viewpoints, and video light from the video display device is used as video light from a pair of viewpoints. In a stereoscopic image display device without glasses, comprising a parallax barrier that separates corresponding to the left and right eyes, the parallax barrier sets the aperture ratio of the peripheral portion of the display screen to be larger than the aperture ratio of the central portion. It is characterized by

The parallax barrier is preferably formed such that the width of the light-shielding portion in the peripheral portion of the display screen is narrower than the width of the light-shielding portion in the central portion.

As described above, by increasing the aperture ratio of the peripheral portion of the display screen, the amount of transmitted light increases. As a result, the interference fringes become thin and the entire screen becomes easy to see.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 is an exploded perspective view showing an embodiment of the present invention, FIG. 5 is an explanatory view showing an embodiment of the present invention, and FIG. 5 is a schematic view for explaining a main part of the present invention. The same parts as those in the conventional example are designated by the same reference numerals.

In the embodiment of the present invention, a backlight, a liquid crystal display panel 2 as a display panel, and a parallax barrier 3 arranged on the observer side of the liquid crystal display panel 2 as in the stereoscopic image display device described above. And As shown in FIG. 4, the parallax barrier 3 is formed by forming a large number of light-shielding portions 32 in stripes on a transparent substrate 31 such as glass or transparent resin. The barrier pitch of the light shielding portion 32 of the parallax barrier is determined by the pixel pitch of the liquid crystal display panel 2 and the distance between viewpoints. As shown in FIGS. 4 to 6, the parallax barrier 3 has different aperture ratios in the central portion and the peripheral portion. Specifically, as shown in FIG. 6, the width of the light shielding portion 32 is narrower in the peripheral portion 32b than in the central portion 32a to increase the aperture ratio of the peripheral portion.

In the embodiment shown in FIGS. 4 to 6, in order to increase the aperture ratio around the upper part and the lower part of the display screen of the liquid crystal display panel 2, the width of the light shielding part 32 around the upper part and the lower part is set to the central part 32a. The peripheral portion 32b is made thinner.

As described above, by increasing the aperture ratio, the amount of light transmitted through the parallax barrier 3 increases. As a result, the interference fringes become thin. Although crosstalk and moire may occur in the peripheral area where the aperture ratio is increased, this does not cause a problem if the central area of the screen can be viewed stereoscopically correctly. The interference fringes are more uncomfortable for the observer than the occurrence of crosstalk or moire.

In the above-described embodiment, the aperture ratios of the upper and lower peripheral portions are increased, but as shown in FIG. 7, the aperture ratios of both ends, that is, the left peripheral portion and the right peripheral portion are increased. You may. In this case, the width of the light-shielding portion 32 around both ends may be narrowed toward the ends.

In the embodiment shown in FIG. 8, the aperture ratios of the four sides other than the central portion are increased. In this case,
The shape of the light shielding portion 32 shown in (1) and the configuration of narrowing the width of the light shielding portion 32 as approaching the right end portion and the left end portion may be combined.

In the above-described embodiment, the liquid crystal display device is used as the image display device, but other display devices such as a plasma display, a rear projection device, and a device using an organic EL light emitting device may be used. it can.

Further, the present invention can be applied to any case where the number of viewpoints is more than two, there is a parallax in the vertical direction, and the openings are obliquely arranged.

[0022]

As described above, according to the present invention, since the interference fringes in the peripheral portion are inconspicuous, the entire screen is easy to see, and stereoscopic vision can be observed without feeling discomfort.

[0023]

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration of a conventional stereoscopic image display device.

FIG. 2 is a perspective view showing an external configuration of a stereoscopic image display device.

FIG. 3 is a schematic diagram showing a generation state of interference fringes in a conventional stereoscopic image display device.

FIG. 4 is an exploded perspective view showing an embodiment of the present invention.

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

FIG. 6 is a plan view showing a main part of a parallax barrier according to the present invention.

FIG. 7 is an explanatory diagram showing a configuration of another embodiment of the present invention.

FIG. 8 is an explanatory diagram showing a configuration of a different embodiment of the present invention.

[Explanation of symbols]

1 backlight 2 Liquid crystal display panel 11 Display screen 3 parallax barrier 32 striped light shields

Claims (2)

[Claims] 1. A video display means for displaying a video from a plurality of viewpoints, and a parallax barrier for separating the video light from the video display means as video light from a pair of viewpoints corresponding to the left and right eyes. In the stereoscopic image display device without glasses, the parallax barrier sets the aperture ratio of the peripheral portion of the display screen to be larger than the aperture ratio of the central portion of the display screen. 2. The stereoscopic image without glasses according to claim 1, wherein the parallax barrier is formed such that a width of a light shielding portion in a peripheral portion of a display screen is narrower than a width of a light shielding portion in a central portion. Display device.