JPS60177788A - Twin-lens stereo picture display device - Google Patents

Abstract

PURPOSE:To obtain a false stereoscopic image of small distortion by displaying mixed information of left and right images on a display device in which picture elements are arranged in matrixlike form and separating them by geometric optical means. CONSTITUTION:Color filters provided in a glass 8 are arranged for each picture element, and guest-host type liquid crystal 9 made by mixing black dichroic coloring matter is sealed in as liquid crystal, and this and a polarizing plate 10 function as a light shutter. This matrix type panel is irradiated by white light 11 from the back, and a color image is reproduced. The color image thus formed is separated to left and right images by a lenticular plate 12 which is in close contact with the liquid crystal panel. The lenticular plate 12 is a fly's eye lens, and this group of lenses is a microlens array made by giving refractive index distribution to a transparent medium.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a two-lens stereoscopic image display device that separates images having left and right image information using geometrical optical means and provides a pseudo-stereoscopic image.

[Prior art]

Since ancient times, many research efforts have been made to obtain dimensional images. Let me briefly explain the technology.

■ Twin-lens peeping glasses method This is a hit! It uses mirrors and prisms to change the left and right viewing angles of the left and right images, which are given separately, as typified by Tone and Brewster's stereoscopes, to create a three-dimensional image. ′
I have to peep 9. It has the disadvantage that it is difficult to match the left and right images, and the viewpoint cannot be moved.

■ Parallax Barrier Method As shown in FIG. 1, seven thin vertical stripes 1 (parallax barrier) are sandwiched between the eyes 2 and the image 3, and a pseudo-stereoscopic image is obtained by alternating left and right images. However, this method reduces the amount of light, increases the precision of the aperture pitch,
This is not practical due to the high precision of image alignment and limited viewpoints.

(2) Lenticular two-plate system This is a system typified by Xograph, in which left and right images are separated by a lenticular plate 12 as shown in FIG. This technology has the advantage of not having limited viewpoints and not being visible to prying eyes, and is a technology that has become a field of printing. A conventional example of an attempt to reproduce stereoscopic video using this is a proposal in which it is combined with a special CRT (NHK Technical Report, May 1961, VO14D, B2). deer. The required image must have a precision that is at least half the pitch of the convex pitch of the lenticular plate, and the distortion of the image must be less than 9 degrees of the convex pitch of the lenticular plate.

Obtaining images with such ultra-low distortion on a CRT requires large-scale equipment and is not practical. In the case of color images where color shift cannot be tolerated, even lower distortion and higher definition are required, which is difficult to achieve with current CRTs.

■ Polarization method This method separates the left and right images as light beams with different polarization planes, but requires polarized glasses.

[Purpose of the invention]

The present invention aims to provide a thin stereoscopic image display device that does not require the use of conventional pseudo-stereoscopic display ("peeking") and has less image distortion. .

[Summary of the invention]

A display device with pixels arranged in a matrix (
Domatrix type liquid crystal panel, matrix type LED
, matrix type KL, etc.), the left and right image information is mixed and displayed, and this is separated by geometrical optical means (lenticular plate, fly's eye lens) to obtain a pseudo-stereoscopic image.

The pixels of the matrix display device are at least half as large as the pitch of the geometrical optical lens group, and display distortion must be smaller than the pixel pitch.

〔Example〕

FIG. 2 is an exploded perspective view of a TFT (thin film transistor) matrix liquid crystal color display panel.

Pixel pitch is 50μ x 150μ, each pixel has 4Id driving T
FT is connected. In this example, Fig. 3(a), (
A TPT with a silicon thin film 7 having the shape shown in b) was used. Each pixel 4 made of a transparent electrode is addressed by a TPT source line 5 and a gate line B, and is supplied with an image information voltage. As shown in Fig. 2, color filters (three primary colors R (red), G (green), B (blue)) provided on the inner surface of the upper glass 8
A mosaic-like transmission filter) is arranged for each pixel. Further, a guest-host type liquid crystal 9 mixed with a black dichroic dye is sealed as a liquid crystal, and this and a polarizing plate 10 function as a light shutter. Although liquid crystals and dichroic dyes of commonly used types can be used, here an anthraquinone-based and azo-based mixed dichroic dye and a biphenyl-based nematic liquid crystal were used. A TN (twisted nematic liquid crystal) mode optical shutter can also be used, but since the viewing angle is narrow, here we will use a guest with a wide viewing angle.
A host type was adopted. The thus obtained matrix type panel is irradiated with white light 11 from the back side, and a color image is reproduced. The formed color image is separated into left and right images by a wrench roller plate 12 closely attached to the liquid crystal panel. A diagram of this principle is shown in FIG. Since humans have two eyes on the left and right and recognize three-dimensional objects mainly by the deviation of images in the left and right directions, it is necessary to form an image 13 whose viewpoint is shifted in a direction perpendicular to the structure of the Wrenchkeeler board. For this reason, the structure pitch and notch of the lenticular plate is set to 500 μm here, and the pixel pitch in the direction perpendicular to the structure of the lenticular plate is 1.
/10 and 50 μm. Furthermore, the three primary colors R1G, B
In the case of a color display in which pixels are alternately provided, it is desirable to make the ratio between the pixel pitch and the structure pitch of the lenticular plate as small as possible. This is because when the viewpoint is continuously moved, the stereoscopic image can be continuously moved, and no brown shift occurs. However, in reality, the best pitch is determined based on the balance between the difficulty of manufacturing and the difficulty of driving. In this example, the effective display surface size is 3 cm x 4 cells, and pixels are arranged at a pitch of 50 μm on the long side. Therefore, the number of pixels on the long side is 800, the number of pixels on the short side is 200, and the total number of pixels on the display surface is t6×10'. TPT
As shown in Figure 5, the ratio of the drain current (D) when 0N to OFF can be 105 or more, so if the number of pixels is around this, it is possible to scan dot-sequentially and write image information. Can be done. Image information is required to be several tens to 10 times larger than that of a general television, but this can be reduced to a realizable band by band compression transmission. It is also necessary to combine image information from many viewpoints to create a video signal, but rather than arranging many television cameras and composing them, it is possible to obtain a video signal by linearly interpolating the image information from several television cameras. It is more practical.

The lenticular plate is then aligned over the liquid crystal panel. This lenticular plate may also serve as one substrate 14 of a liquid crystal panel, as shown in FIG. Further, in the production of the lenticular plate, as shown in FIG. 7GzL(b)K, it is also possible to fabricate the lenticular plate by using a deep ultraviolet photoresist 15 and performing buttering re-annealing and flowing it in a stripe shape.

Although the case where a lenticular plate is used has been described above, it is also possible to use a fly's eye lens that enables stereoscopic viewing in the vertical direction. However, in this case, a fine pixel pitch is required in the vertical direction as well, and the driving ability is insufficient, so it is necessary to divide the image into several parts and drive them.

In addition, a liquid crystal panel is formed using a microlens array with a refractive index distribution in a transparent medium, and a lenticular plate,
It is possible to have the same effect as a fly's eye lens.
The advantage of microlens arrays fabricated by photophosphorography is that the pinch of the lens groups can be determined accurately.

Furthermore, although the case where the electro-optic effect of liquid crystal is used has been described here, the present invention can be applied to any device in which minute pixel formation is possible and matrix display with high positional accuracy can be performed.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to obtain a thin three-dimensional display device that does not require the use of special glasses or "peeping", thereby realizing a three-dimensional television.
An inexpensive and easy-to-use display device can be provided in the fields of education, medicine, and entertainment.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle of the parallax barrier method. FIG. 2 is an exploded perspective view of a TPT matrix liquid crystal color display device. FIG. 3 shows the TPT and pixels used in FIG. 2. (b)) is a plan view, and (b) is a sectional view taken along a dashed line. FIG. 4 shows the principle of stereoscopic vision using a Wrench Keeler plate. FIG. 5 shows the transistor characteristics based on the gate voltage yo and drain current of the TPT used in FIG. 2'. FIG. 6 is a cross-sectional view when one of the substrates is a lenticular plate. FIG. 7 is a cross-sectional view when a lenticular plate' is manufactured using a resist. Ca) shows after patterning, and ω) shows after annealing and flow. Figure 1 Figure 2 Figure 3 Figure 4 Construction (A) Figure 5 (H) Figure 7

Claims (1)

[Claims] (1) In a two-lens stereoscopic display device that provides image information from different viewpoints to the left and right eyes to produce a stereoscopic image, a switching element for controlling each pixel is provided on a substrate as an image forming means. A two-lens three-dimensional image display device comprising: a matrix type display panel having an array of pixels; and a geometric optical lens group that separates left and right image information. (2) Claim 1, wherein the image forming means is a display device that utilizes the electro-optic effect of liquid crystal.
2. The twin-lens three-dimensional image display device as described in 2. (6) The twin-lens three-dimensional image display device according to claim 1, wherein the switching element is an FT (thin film transistor). (4) The twin-lens three-dimensional image display device according to claim 1, wherein the geometrical optical lens group is a lenticular plate. (5) The twin-lens three-dimensional image display device according to claim 1, wherein the geometrical optical lens group is an optical lens. (6) The geometrical optical lens group is a microlens array in which a refractive index distribution is given to a transparent medium'lr:
A twin-lens three-dimensional image display device according to claim 1, which is an @ symbol. (7) The two-lens three-dimensional image display device according to claim 1, characterized in that each pixel of the image forming means has a color filter.