JPS6011329B2 - 3D display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stereoscopic display device having two layers of display elements having strong viewing angle dependence.

An object of the present invention is to suppress flickering of displayed images by always displaying images viewed from different viewing directions.

As an example of a conventional stereoscopic image display device, the image is optically decomposed into line images at the image station and directly transmitted and received by the TV system.

By aligning the lenticular plate with the reproduced line image on the monitor screen, the reproduced stereoscopic image can be observed with the naked eye. In this case, the image appears fluffy and looks very unsightly. Another example is to alternately transmit images from different directions on a monitor TV about twice every 60 days, and also display images in front of the observer's eyes in synchronization with the frequency of image transmission to the left and right eyes. A shutter mechanism is provided. With this method, no striped images are observed, but the flickering of the display is noticeable. The present invention eliminates the unsightly display and flickering as described above, and will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, and 1 and 2 are the first
A display element and a second display element are shown. The viewing angle dependence of each display element is very strong; for example, display element 1 exhibits an extremely strong display contrast in direction 3, and the display is not visible even when observed from any other direction. Display element 2 exhibits extremely strong display contrast in direction 4,
The display cannot be seen even when viewed from any other direction. The direction 3 and the direction 4 are the direction of the right eye and the direction of the left eye of the observer, respectively. Here, suppose that there is a rectangular parallelepiped as shown in FIG. 2c, for example, and the pattern observed in the direction of the left eye is shown in FIG. 2a, and the pattern observed in the direction of the right eye is shown in FIG. 2b. Then, the pattern in Figure 2 a is used as the first pattern.
The pattern shown in FIG. 2b is reproduced by the display element 1 in FIG. 1. Then the second
The pattern in figure a is visible only to the observer's left eye;
The pattern in Figure b is only visible to the observer's right eye. Therefore, in the end, the viewer is looking at the actual object, and can observe a natural three-dimensional image without vertical stripes or flickering. Furthermore, since observation patterns in different directions can be displayed simultaneously and continuously, drive control of the display element is extremely easy. FIG. 3 shows an embodiment of the present invention, in which a twisted nematic type liquid crystal display element is made up of two layers. 11 is a polarizing device that transmits light vibrating in the direction of 12; 13, 14, and 15 are transparent substrates having electrodes (electrodes in a matrix structure); A nematic liquid crystal with positive anisotropy is installed.

Reference numeral 16 indicates a rubbing direction (liquid crystal alignment treatment) on the lower surface of the substrate 13, and 17, 18 and 19 indicate rubbing directions on the upper surface of the substrate 14, the lower surface of the substrate 14, and the upper surface of the substrate 15, respectively.

Therefore, both the upper and lower layers of liquid crystal are twisted nematic type, twisted by 90 degrees. In the case of the embodiment shown in FIG. 2, the liquid crystal display element formed between substrates 13 and 14 shows strong viewing angle dependence in the right direction, and the liquid crystal display element formed between substrates 14 and 16 shows strong viewing angle dependence in the left direction. Shows strong visual angle dependence on direction.
Therefore, for example, by reproducing the pattern shown in FIG. 2b on the upper layer liquid crystal display element and reproducing the pattern shown in FIG. 2a on the lower layer liquid crystal display element, a three-dimensional image can be observed. FIG. 4 is a diagram explaining the principle of FIG. 3 which is an embodiment. 11 is a polarizing device, 13, 14 and 15 are transparent electrode substrates, and 21 and 22 are twisted nematic type liquid crystal layers, respectively.

Electrodes 13, 14, and 15 each have a fine matrix of electrodes formed on the substrate surface, and are controlled so that an effective voltage slightly higher than the threshold voltage is applied to both the upper and lower liquid crystal layers.

That is, this voltage is a voltage that is lower than the saturation effective voltage of the liquid crystal. Then, due to the combination of alignment treatments shown in FIG. 3, the liquid crystal molecules in the upper layer are oriented slightly to the right, and when observed from the direction 24, the optical rotation is lost, making it possible to observe the display pattern. However, since the liquid crystal molecules in the lower layer are tilted in a direction perpendicular to the direction of 24, the optical rotation is not lost in the direction of 24, and no display pattern is observed. Conversely, in the direction 23, the display pattern of the upper layer liquid crystal is not observed, but the display pattern of the lower layer liquid crystal is observed. Therefore, by simultaneously displaying images viewed from different directions on the upper and lower liquid crystal display elements, a three-dimensional image can be viewed with the naked eye. In this way, the present invention applies a twisted nematic display element with a two-layer structure, and specifies the control voltage of the liquid crystal in order to emphasize the viewing angle dependence of the liquid crystal, so that the left and right images can be clearly distinguished, and the image can be displayed without flickering. It is possible to create a 3D display device with no unevenness. According to the present invention, since images observed from different directions can be reproduced in the same place, there is no need for special gaze training on the part of the observer, and the three-dimensional image can be viewed naturally.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the invention. FIGS. 2a, b, and c are explanatory diagrams of embodiments of the present invention. FIG. 3 is a perspective view of an embodiment of the invention. FIG. 4 is a sectional view of an embodiment of the present invention. Eagle 1 diagram multi-Z zone [4] Diagram 2's younger brother Z diagram 'C) Multi-3 diagram ticket 4 diagram

Claims (1)

[Scope of Claims] 1. A three-dimensional display device in which left and right patterns are visually recognized with both eyes, wherein the left and right patterns are displayed on display elements having visual angle dependence in different directions. The three-dimensional display device is characterized in that the display element has a two-layer structure of a twisted nematic liquid crystal display element. 2. The stereoscopic display device according to claim 1, wherein the viewing angles of the display elements having viewing angle dependence in different directions are matched to the directions of the right eye and left eye of the viewer. 3. The stereoscopic display device according to claims 1 and 2, wherein observation patterns viewed from different directions are simultaneously displayed on each layer of the two layers of liquid crystal display elements. 4. The stereoscopic display device according to claims 1, 2, and 3, wherein the liquid crystal display element is controlled at a saturation effective voltage of the liquid crystal or less.