JPH0636137B2 - Liquid crystal color display device capable of stereoscopic viewing - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal color display device that enables stereoscopic viewing by using a lenticular lens.

(Prior Art) A liquid crystal panel is known as one of flat panel displays. The liquid crystal panel utilizes that liquid crystal molecules change the alignment direction by an external electric field.
Generally, it is composed of a pair of substrates arranged in parallel and having a common electrode on one side and a pixel electrode on the other side facing each other, and a liquid crystal sealed between these substrates.
In such a liquid crystal panel, color display can be realized relatively simply by adding color filters having patterns of three colors such as red, green, and blue having mutually different spectral distributions. LCD color TV is one of the applied products (for the above, for example, Nikkei Electronics,
(See the description of p211 to 240, especially p212 to 217, September 10, 1984).

(Problems to be Solved by the Invention) The inventors of the present invention considered that color display by a liquid crystal color display device such as a liquid crystal color television is advanced one step further to enable stereoscopic viewing.

The lenticular method is well known as a technology that enables stereoscopic viewing. The lenticular method is a method in which a stereoscopic image is subdivided, right and left images are alternately arranged and viewed as a stereoscopic image through a lenticular lens. However, if this lenticular method is applied to a television displaying a moving image, a considerable difficulty occurs. That is, in a general television using a cathode ray tube, the pixel position is unstable, and it is difficult to accurately correspond the position of each image of the right eye and the left eye to each lenticular lens, and in practice, It is impossible to obtain a valid stereoscopic image.

On the other hand, in the case of a liquid crystal color display device, since the pixels are patterned and fixed, the positional accuracy of each image with respect to the lenticular is only due to the working accuracy of each lens and pattern, and high accuracy is required. Can be planned. The inventors of the present invention have paid attention to such a point, and have selected a liquid crystal color display device as a target for stereoscopic visualization, and have made various studies. The following is an obstacle to practical application of stereoscopic vision. There was found. For one, because the light transmitted through the liquid crystal panel is polarized, the viewing direction of the image is limited,
The field of view is narrow, and one is that the pixels look rough because they are divided into patterns of red, green, blue, and the like.

(Means for Solving the Problems) In the present invention, the lenticular plate is arranged on one surface of the liquid crystal panel on the side facing the color filter via the scattering layer. The lenticular plate has a large number of minute lenticular lenses, and each lenticular lens is
The three color patterns adjacent to each other on the color filter are arranged to be displayed as a pair of images for the right eye and the left eye. The scattering layer is for scattering light corresponding to the three-color pattern forming the unit pixel and synthesizing the three colors in a range that does not cause mutual interference between the images of the right eye and the left eye. . This scattering layer can be obtained by roughening the back surface of the lenticular plate, by coating a transparent substance mixed with substances having different refractive indexes, or by inserting a diffusion sheet or a matt-treated substrate. .

In order to effectively prevent mutual interference between the right-eye image and the left-eye image, between the three-color pattern corresponding to the right-eye image and the three-color pattern corresponding to the left-eye image, It is preferable to provide a black pattern for separating each image as a separation band.

(Operation) The scattering layer scatters and mixes light that passes through the liquid crystal panel and corresponds to the pattern of the three colors of red, green, and blue, and gives image information in a form in which these three colors are combined. Therefore, it is possible to improve the image quality of the image displayed in color, and further, it is possible to see each image of the right eye and the left eye in a wide field of view, and it is possible to effectively see the moving image as a stereoscopic image.

(Embodiment) FIG. 1 is a sectional structural view showing the overall structure of a liquid crystal color display device according to an embodiment of the present invention.

In the figure, the liquid crystal color display device has a reference numeral 10 as a whole.
In addition to the liquid crystal panel 12 and the color filter 14, it is composed of a scattering layer 16 made of a diffusion sheet, and a lenticular plate 18 having a large number of minute lenticular lenses 18a in a semi-cylindrical shape.

The liquid crystal panel 12 includes a pair of transparent glass substrates 20, 22.
It is a general one having a liquid crystal layer 24 between them. In each of the glass substrates 20 and 22, transparent electrodes (not shown) are arranged on the inner surface side of the liquid crystal layer 24, and polarizing plates 26 and 28 are arranged on the outer surface side thereof. The color filter 14 is for displaying a color, and is arranged on the inner surface of the front glass substrate 22 adjacent to the liquid crystal layer 24 here in order to prevent color shift due to parallax. This color filter 14
Has three patterns R, G and B of three colors of red, green and blue, and these three color patterns form one pixel. These three-color patterns R, G, and B have a pattern 14r corresponding to the image of the right eye and a pattern 14l corresponding to the image of the left eye for stereoscopic viewing.
And are staggered, and each image 1
A separation band 30 formed of a black pattern is provided between 4r and 14l in order to prevent mutual interference between the left and right images. The color filter 14 itself can be formed by using a known technique such as photolithography or printing.

The scattering layer 16 is composed of a plastic diffusion sheet such as polycarbonate or polyester. The scattering layer 16 is for scattering light transmitted through the R, G, and B patterns on the color filter 14 for each pixel and mixing the three colors as much as possible. It is set such that appropriate scattering occurs between the images 14r and 14l of the eye within a range where mutual interference does not occur. Therefore, for example, the thickness of the scattering layer 16 is
The size is generally 500 μm to 2 mm, although it is appropriately selected depending on the R, G, and B patterns on the color filter 14, the size of the separation band 30, the scattering degree of the scattering layer 16 itself, and the like. The lenticular plate 18 is arranged on the front surface of the liquid crystal panel 12 so as to sandwich the scattering layer 16. The lenticular plate 18 itself is a molded plastic product, and the flat rear surface 18b is in contact with the scattering layer 16, while the uneven front surface 18c constitutes the display surface. The lenticular plate 18 is formed such that each lenticular lens 18a has a flat focus on the rear surface 18b, and a pair of right-eye and left-eye pixels 14r and 141 correspond to each lenticular lens 18a.

Now, when the liquid crystal panel 12 is illuminated with the illumination light 32 from a fluorescent lamp or electroluminescence, the light transmitted through the liquid crystal layer 24, the color filter 14 and the like has the scattering layer 16, so that each pixel 14r, The rear surface 18b of the lenticular plate 18 is combined every 14 l, and image information having a color in the form of combining the three colors is given.
Moreover, the two pixels 14r and 14l for each lenticular lens 18a are clearly separated by the separation band 30, and enter the right eye and the left eye, respectively. Therefore,
A viewer of this can stereoscopically view a full-color moving image on the liquid crystal panel 12. And in this case,
Since the scattering layer 16 also widens the field of view of the displayed image, the displayed image is easy to see.

Although the scattering layer 16 is formed separately from the glass substrate 22 in the above-described embodiment, the glass substrate and the scattering layer may be integrally formed and used as both.

(Effect) In the present invention, since the lenticular plate is arranged on one surface of the liquid crystal panel via the scattering layer, a liquid crystal color display device capable of stereoscopic viewing by displaying an image displaced by the left and right parallaxes. Can be put to practical use. In particular, in the present invention, the arrangement of the three color patterns of the color filter is used, and the three color patterns adjacent to each other are arranged so as to be displayed as a pair of images for the right eye and the left eye by each lenticular lens. Therefore, a remarkable effect that no image processing is required for stereoscopic viewing can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional structural view showing the overall structure of an embodiment of the present invention. 10 ... Liquid crystal color display device, 12 ... Liquid crystal panel, 1
4 ... Color filter, 14r ... right image, 14l ...
Left image, 16 …… Scattering layer, 18 …… Lenticular plate,
18a ... Lenticular lens, 20, 22 ... Glass substrate, 24 ... Liquid crystal layer, R ... Red pattern, G ...
Green pattern, B ... Blue pattern, 30 ... Separation band.

Claims (2)

[Claims] 1. A liquid crystal color display device in which a color filter having a pattern of three colors having mutually different spectral distributions is added to a liquid crystal panel, and a scattering layer is provided on one surface of the liquid crystal panel and on a side facing the color filter. The lenticular plate is disposed through the lenticular plate, the lenticular plate has a large number of minute lenticular lenses, each lenticular lens has one surface of the scattering layer as the focal plane, and the three adjacent lenticular lenses on the color filter. A stereoscopic liquid crystal color display device arranged so as to display a color pattern as a pair of images for the right eye and the left eye. 2. The color filter includes a separation band for separating each image between the three-color pattern corresponding to the right-eye image and the three-color pattern corresponding to the left-eye image. The stereoscopic liquid crystal color display device according to claim 1.