JPH05257083A - Stereoscopic display device - Google Patents

Abstract

PURPOSE:To display a left and a right image to be viewed which have a 90 deg. difference in a polarizing direction in the same field by converting the polarizing direction into the 90 deg. difference by the left and right images to be viewed which are displayed on a liquid crystal panel at the same time. CONSTITUTION:This stereoscopic display device consists of the liquid crystal panel 1 which constitutes a liquid crystal television set, a couple of polarizing plates 11 and 12 which are arranged on both its sides, an optical element 21 which is arranged on their light transmission side, and polarizing spectacles 31 for stereoscopy. The polarizing direction is converted into the 90 deg. difference by the left and right images to be viewed which are displayed on the liquid crystal panel 1 at the same time to display the left and right images having the 90 deg. difference in polarizing direction in the same field at the same time, so an excellent stereoscopic image having no flicker due to field-by-field switching of the left and right images and polarizing direction is obtained. Further, the left and right images to be viewed need not be put one over the other unlike a projection system, so the stereoscopic image is easily obtained.

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 capable of viewing a stereoscopic image by utilizing parallax between the left and right eyes.

[0002]

2. Description of the Related Art Conventionally, in a stereoscopic display device using a CRT and polarizing glasses, left and right viewing images are switched and displayed on the CRT for each field, and the polarization direction of the left and right viewing images is displayed by one field on a liquid crystal panel. There is one that is switched every time (for example, Japanese Patent Laid-Open No. 61-250613).
Japanese Patent Laid-Open No. 62-191824).

Conventionally, in a projection type stereoscopic display device, left and right viewing images are projected so as to be superimposed on each other using two projection display devices.

[0004]

However, the former of the conventional stereoscopic display device has an unnatural feeling that flicker occurs due to switching of left and right images and polarization directions for each field. Moreover, there is a problem that a complicated device for increasing the field frequency is required.

The latter requires two projection display devices, is expensive, and has a problem in that the alignment is complicated and complicated when the left and right viewing images are projected so as to be superimposed. .

The present invention has been made to solve the above problems, and an object of the present invention is to provide a stereoscopic display device capable of displaying left and right viewing images having a 90 ° difference in polarization directions in the same field. There is.

[0007]

According to a first aspect of the present invention for achieving the above object, a stereoscopic display device according to the present invention is arranged between a pair of polarizing plates, and images for left and right viewing are switched at a constant cycle at the same time. A liquid crystal panel for displaying, an optical element for converting the polarization direction of light transmitted through the liquid crystal panel into a 90 ° difference for each image in left and right viewing, and a stereoscopic view having a polarization direction coinciding with the polarization axis of the optical element. It is equipped with polarized glasses.
According to a second aspect of the present invention, the optical element converts the polarization direction of the light transmitted through the liquid crystal panel into a 90 ° difference for each pixel.

[0008]

According to the first aspect of the stereoscopic display device configured as described above, since the polarization direction can be converted into a 90 ° difference for each of the left and right images displayed on the liquid crystal panel at the same time, the polarization direction is 90 °. It is possible to display left and right images having a difference in the same field. According to the second aspect, it is possible to switch the pixels of the liquid crystal panel for each field in the polarization direction.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the stereoscopic display device of the present invention will be described below with reference to the drawings.

First, as shown in FIG. 1, this stereoscopic display device comprises a liquid crystal panel 1 constituting a liquid crystal television, a pair of polarizing plates 11 and 12 arranged on both sides thereof, and a light transmitting side thereof. The optical element 21 and the polarized glasses 31 for stereoscopic viewing are used.

The liquid crystal panel 1 is formed by sandwiching both sides of the liquid crystal layer 2 with a pair of glass substrates 3.
The images for left and right viewing are switched at a constant cycle and displayed simultaneously. That is, for example, as shown in (A) and (B) of FIG.
The image for the right eye and the image for the left eye are switched and displayed at the same time every other row of pixels 2a and 2b of the liquid crystal layer 2.

The polarization direction of the light emitted from the light source 41 and passing through the liquid crystal panel 1 in the direction of the arrow in FIG. 1 is polarized in the direction of the arrow P1 in FIG. 3 by the polarizing plate 12 on the front side (the upper side in FIG. 1). It

Next, as shown in FIG. 4, the optical element 21 changes the polarization direction of the light transmitted through the liquid crystal panel 1 and the polarizing plates 11a and 11b by 90 ° for each pixel 4a and 4b of the left and right images. As shown in FIG. 3, it is converted to the directions of P and R shown in FIG.

As such an optical element 21, for example, a TN liquid crystal panel in which a liquid crystal layer 22 is sandwiched between a pair of electrode substrates 23 and 24 can be used. At this time, as shown in FIG. 5, striped electrodes 25a and 25b are formed on the pair of electrode substrates 23 and 24 at the same pitch as the pixels 4a and 4b of the liquid crystal panel 1 shown in FIG. Then, the electrodes 25a on the rear side (lower side in FIG. 1) of the electrode substrate 24,
The orientation of the liquid crystal due to the energization of 25b is aligned with the P'direction parallel to the P direction shown in FIG. 3 among the polarization directions of the light transmitted through the liquid crystal panel 1 and the polarizing plates 11 and 12. In addition, the front side (Fig. 1
In FIG. 3, the orientation of the liquid crystal by energization of the electrodes 25a and 25b of the upper electrode substrate 23 is aligned with the R'direction parallel to the R direction shown in FIG.

The left and right lenses 3 of the polarizing glasses 31
The polarization directions of 2, 33 are different from each other by 90 ° in the P and R directions.

According to the stereoscopic display device configured as described above, the right image signal and the left image signal of the two video cameras which have taken the images for left and right viewing are provided to the pixels 4a and 4b of the liquid crystal panel 1 shown in FIG. The electrodes are arranged in a striped shape as shown in FIG.
A and 25b are alternately turned on and off, and the viewer views the image through the left and right lenses 32 and 33 of the polarized glasses 31.

Then, one of the left and right images is transmitted through the optical element 21 while the polarization direction is set to the P direction by the polarizing plate 11a, and the polarizing glasses 31 pass through the lens 31 whose polarization direction is the P direction. To Penetrate. The other image becomes the R direction in which the polarization direction is rotated by 90 ° by the optical element 21, and is transmitted through the lens 32 in which the polarization direction of the polarization glasses 31 is the R direction.

As a result, a stereoscopic image can be viewed by utilizing the parallax between the left and right eyes.

At this time, the pixels 4a and 4b for displaying left and right images of the liquid crystal panel 1 are replaced for each field, and in accordance with this, the striped electrodes 25a of the optical element 21,
If ON and OFF of 25b are reversed, a stereoscopic image can be obtained without halving the apparent resolution.

The embodiment of the present invention has been described above.
The present invention is not limited to the above embodiments, and various modifications can be made based on the technical idea of the present invention. For example, the present invention can be used not only in the direct-viewing method shown in the above embodiment but also in the projection method. As the optical element, a ferroelectric liquid crystal panel or the like can be applied in addition to the TN liquid crystal panel shown in the above-mentioned embodiment, and the striped electrodes shown in the above-mentioned embodiment are also formed by coating a material having polarization property. It can be converted into a striped polarizing element or the like.

[0021]

The stereoscopic display device of the present invention constructed as described above has the following effects.

According to a first aspect of the present invention, the polarization direction is converted into a 90 ° difference for each of the left and right viewing images simultaneously displayed on the liquid crystal panel, and the left and right viewing images having a 90 ° difference in the polarization direction are displayed in the same field. Therefore, it is possible to obtain a right-and-left image and a good stereoscopic image in which no flicker occurs due to switching of the polarization direction for each field. Further, unlike the projection method, there is no need to superimpose left and right viewing images, so that a simple stereoscopic image can be obtained.

According to the second aspect, since it is possible to switch the polarization direction of the pixels of the liquid crystal panel for each field, a stereoscopic image can be obtained without lowering the resolution.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view illustrating a stereoscopic display device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a relationship between pixels of a liquid crystal panel and left and right images.

FIG. 3 is a drawing showing polarization directions of light.

FIG. 4 is a diagram illustrating a polarization direction of an optical element.

FIG. 5 is a diagram illustrating a striped electrode of an optical element.

[Explanation of symbols]

 1 Liquid Crystal Panel 4a, 4b Pixel 11, 12 Polarizing Plate 21 Optical Element 25a, 25b Striped Electrode 31 Polarizing Glasses

Claims (2)

[Claims] 1. A liquid crystal panel which is disposed between a pair of polarizing plates and which switches left and right viewing images at the same time by switching them at a constant cycle, and the polarization direction of light transmitted through the liquid crystal panel is 90 for each left and right viewing image. A stereoscopic display device comprising: an optical element for converting into a difference; and stereoscopic polarizing glasses having a polarization direction that coincides with a polarization axis of the optical element. 2. The stereoscopic display device according to claim 1, wherein the optical element converts a polarization direction of light transmitted through the liquid crystal panel into a 90 ° difference for each pixel.