JPS62166314A - Liquid crystal spectacles for stereoscopic video and driving method thereof - Google Patents

Abstract

PURPOSE:To permit the reproduction and viewing of a bright stereoscopic video of good contrast by constituting the 1st and 2nd shutter elements in such a manner that the open and shut conditions thereof are reversed from the open and shut conditions of the same driving signals and providing the shutters laminated with such 1st and 2nd shutter elements on the right and left. CONSTITUTION:The shutter element 8 (9) is constituted by sticking polarizing plates 4, 5 (6, 7) in the relation of parallel Nicols to both faces of the liquid crystal element 2 (3). The shutter element 8 transmits (shuts off) light L1, namely, attains the open (shut) state, when a voltage is impressed to the liquid crystal element 2. The shutter element shuts off (transmits) the light L1, namely, attains the shut (open) state in an opposite case. The shutter elements 8, 9 are laminated on the surfaces of the polarizing plates 5, 6 to constitute a shutter 1. The shutter 1 constituted in such a manner is provided as the shutter 1 on, for example, the left side of spectacles and the equiv. shutter is mounted as the shutter 1' on the right side of the spectacles, by which the liquid crystal spectacles 10 for stereoscopic video are constituted.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to glasses for stereoscopic viewing of images using, for example, a television. The present invention relates to liquid crystal glasses for stereoscopic images, which have an rJ1m function during shutter time, and a method for driving the same.

[Prior Art] Various methods can be used to obtain stereoscopic images, but for example, the left and right images of the stereoscopic image are divided into even and odd fields that make up the image frame, and the shutters are adjusted accordingly.
There is a field-sequential stereoscopic television that views images stereoscopically using glasses that have instincts.

In the glasses used in this type of 3D television, for example, only the left shutter of the glasses is opened when the image of the field for the left eye is being played, and then the shutter on the left side of the glasses is opened when the image of the field for the right eye is being played. Only the right shutter opens, and such glasses can be realized by applying liquid crystal elements, piezoelectric elements, etc.

FIG. 4 is a schematic diagram for explaining conventional liquid crystal glasses for stereoscopic images, and this figure shows one shutter of the glasses. In the figure, the shutter 20 is the liquid crystal element 2.
It has a structure in which polarizing plates 22 and 23 are pasted on both sides of the shutter 2, and while a voltage is applied to the liquid crystal element 21, the shutter 2 is closed.
0 transmits the light L2, that is, it is in an open state, and the liquid crystal element 21
The shutter 20 blocks the light L2 while no voltage is applied to the
That is, it is in a closed state.

FIG. 5 is a time chart for explaining the operation of the shutter 20. FIG. 5(A) is a waveform diagram of the drive signal applied to the liquid crystal element 21, and FIG.
It is a waveform diagram of rr1 characteristic. As is clear from FIG. 5, it takes time for the shutter 20 to open and close in response to the rise and fall of the drive signal. In particular, when the drive signal falls (the voltage becomes zero), the time it takes for the shutter 20 to change from the open state to the closed state is long, sometimes taking 10 m5ec or more.

Further, this shutter 20 includes a liquid crystal element 21 and a polarizing plate 22.
．． 23, when a voltage is applied to the liquid crystal element 21, the shutter 20 cuts off the light L2, that is, the shutter 20
You can also make it into a leap state. In this case, it takes a long time for the state to change from closed to open.

[Problems to be Solved by the Invention] The rising and falling times of opening and closing of the shutter are long with respect to the drive signal applied to the liquid crystal element. There are problems such as the response does not follow, the blocking and transmission of light is incomplete, and the shutter gap cannot have a large contrast.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides liquid crystal glasses for stereoscopic images by providing polarizing plates on both sides of each of a pair of liquid crystal elements, and driving the liquid crystal elements to the liquid crystal glasses. The first and second shutter elements have a shutter function by applying a signal, and the opening and closing states of the shutter function of the first and second shutter elements are reversed in response to the same drive signal. A method for driving liquid crystal glasses for stereoscopic images constructed as above is described, and a shutter in which the first and second shutter elements are laminated is provided on the left and right sides. The drive signal to be driven is such that the voltage application time in the drive signal is π/2i1i and is shortened by a predetermined value with respect to the drive signal for the first shutter element. .

[Embodiment] FIG. 1 is a schematic diagram for explaining an embodiment of the liquid crystal glasses for stereoscopic images of the present invention, and shows one shutter 1 of the liquid crystal glasses for stereoscopic images of the present invention. In the same figure, 2.3 is a liquid crystal element, and in this case, liquid crystal elements 2, 3
have undergone the same molecular orientation treatment and have the same polarization mode of light.

As is well known, the configuration of the liquid crystal element 2.3 is such that, for example, a pair of transparent glass substrates provided with transparent electrodes are subjected to alignment treatment so that the liquid crystal is twisted by 90', and then the pair of glass substrates are twisted by about 5 μm.
Nematic liquid crystal (N.

This is a sealed liquid crystal material in which a small amount of cholesteric liquid crystal (Ch liquid crystal) is added to liquid crystal.

Polarizing plates 4 and 5 are attached to both sides of the liquid crystal element 20 in a parallel two-way relationship to constitute a shutter element 8, and when a voltage is applied to the liquid crystal element 2, the shutter element 8 emits light L.
1 is transmitted, that is, in the open state, and in the opposite case, the light L1 is blocked,
In other words, the closed state is loud.

The liquid crystal element 3 has polarizing plates 6.7 attached to both sides thereof in a crossed Nicols relationship to constitute a shutter element 9. This shutter element 9 emits light when a voltage is applied to the liquid crystal element 3.
1 to i[7i (open state), and in the opposite case, light L1 is transmitted (open state).

These shutter elements 8 and 9 are stacked on the polarizing plate 5.6 to form the shutter 1. During this lamination, the polarizing plates 5.6 are arranged so that the adjacent polarizing plates 5.6 have the same polarization direction.
, 6, it is also possible to omit one of the polarizing plates 5 and 6.

The liquid crystal glasses 10 for stereoscopic images of the present invention were constructed by attaching the shutter 1 having such a configuration to the left side of the glasses, for example, and the shutter 1' to the right side of the glasses.

FIG. 2 is a time chart for explaining the operation of the liquid crystal glasses 10 for stereoscopic images according to the present invention. FIG. Waveform diagram of drive signal @b for element 3, (C) is for shutter element 8
A waveform diagram of the opening/closing characteristic C, (D> is a waveform diagram of the opening/closing characteristic d of the shutter element 9, and (E) is a waveform diagram of the opening/closing characteristic e of the shutter 1.

FIG. 3 is a block system diagram of a driving device for liquid crystal glasses 10 for stereoscopic images according to the present invention.

In the figure, reference numeral 11 denotes an input terminal to which a field-sequential stereoscopic television signal is supplied from, for example, a video disc. In this type of stereoscopic television signal, left and right images are sequentially switched and transmitted according to even or odd fields that make up a frame image. The television signal is processed using, for example, the NTSCm standard system.

The input terminal 11 is connected to a monitor television receiver 12 and a synchronization signal separation circuit 13.
The output signal of No. 3 is input to a modulation circuit 15 via a field identification circuit 14, and this modulation circuit 15 is further supplied with an output signal of an oscillation circuit 16.

The output signal of the modulation circuit 15 enters a drive circuit 17, and the output signal of this drive circuit 17 is supplied to the shutter 1.1' of the liquid crystal glasses 10 for stereoscopic imaging.

Next, a method for driving the stereoscopic liquid crystal glasses 10 will be explained with reference to FIGS. 1 to 3. The three-dimensional television signal input to the input terminal 11 is reproduced as an image by the monitor preview receiver l1112, and at the same time, the synchronization signal separation circuit 13 extracts the vertical synchronization signal and horizontal synchronization signal, and the next field identification circuit 14 extracts the vertical synchronization signal and horizontal synchronization signal. By comparing the phases of the vertical synchronization signal and the horizontal synchronization signal, it determines whether the field at that time is even or odd, and outputs a signal as, for example, a square wave H in an odd field and an L of the same square wave in an even field. This switching of the day and year is performed every 1/60 second in NTSC television, for example.

The modulation circuit 15 modulates the high frequency signal from the oscillation circuit 16, for example, the 1Kl-(z signal, with a square wave that is the previous field even/odd identification signal.
7 outputs the drive signals a and b shown in FIG.

The opening/closing state of the shutter element 8 is controlled in accordance with the period T1 of the drive signal a, and the opening/closing characteristics at this time are shown in FIG.
As shown in FIG. 5(B), the opening/closing characteristics are the same as those shown in FIG. 5(B).

The above-mentioned period T1 is 1/60 second in the case of an NTSC television, and the shutter element 8 is controlled so as to be in an open state only in either an even field or an odd field.

Next, as described above, the shutter element 9 is in the closed state when a voltage is applied by the drive signal S, and is in the open state when the applied voltage is zero. At this time, the voltage application time of the drive signal a is delayed by π/2 and is shorter by a predetermined time T than the drive signal a.

This predetermined time T2 is set as the rise time for the shutter element 9 to saturate from the open state to the open state by reducing the applied voltage to zero. The opening/closing characteristics of the shutter element 9 driven by such a drive signal are shown in FIG.
4 [Ru]

Therefore, the opening/closing characteristic e of the shutter 1 is given by the opening/closing characteristic C1d.
If either shutter element 8 or 9 is in the closed state, the shutter 1 is in the closed state, so the opening/closing characteristics are as shown in Fig. 2 (E).
The characteristic is shown in the figure e. As is clear from the m-characteristic e in the figure, the saturation time from the state to the state (2), that is, the falling time is short. Furthermore, since the shutter element constituting the shutter 1 has two layers, the contrast is improved, and if only the contrast is considered, it is better to have three or more layers.

Here, the shutter 1 on the left side of the 3D image liquid crystal glasses 10
The operating principle of the right shutter 1' is the same, but its drive signal is π/
The phase is shifted by 2, and the opening and closing timings of the left shutter 1 and the right shutter 1' are opposite to each other.

Note that the configuration of the shutter element 8°9 constituting the shutter 1 is not limited to the above embodiment, and may be modified by other combinations of the polarizing axis of the polarizing plate, the molecular orientation treatment, and the liquid crystal material.
Similar effects 9 can be obtained even if the shutter elements 8 and 9 configure different modes.

Furthermore, it goes without saying that the liquid crystal glasses for stereoscopic images of the present invention can be applied not only to television, but also to movies, etc., as long as left and right images are sequentially reproduced in a time-sharing manner.

[Effect of the invention] According to the present invention, the rise of opening and closing of the shutter function.

You can obtain liquid crystal glasses for stereoscopic images that have a steep fall and also have good contrast, so when viewing stereoscopic images using these glasses, the left and right images have less glue 0 stoke and are bright and have good contrast I~. It has the effect of allowing stereoscopic images to be played back.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram for explaining an embodiment of the liquid crystal glasses for stereoscopic images of the present invention, and FIG. 2 is a time chart for explaining the operation of the shutter of the liquid crystal glasses for stereoscopic images of the present invention. , the figure (A) is a waveform diagram of the drive signal a of the liquid crystal element 2, the figure (B) is a waveform diagram of the drive signal a of the drive element 3 of the liquid crystal element 3, and the figure (C) is a waveform diagram of the drive signal a of the liquid crystal element 3. Characteristic C
, (D) is a waveform diagram of the opening/closing characteristic d of the shutter element 9, (E) is a waveform diagram of the opening/closing characteristic e of the shutter 1, and FIG. 3 is a waveform diagram of the opening/closing characteristic e of the shutter element 9. A block system diagram of the driving device, FIG. 4 is a schematic diagram for explaining conventional liquid crystal glasses for stereoscopic images, and FIG. 5 is a time chart for explaining the operation of the shutter 20. 1.1'...shutter, 2,3...liquid crystal element, 4.
5.6.7...Polarizing plate, 8,9...Shutter element,
a, b... Drive signal, c, d, e... Opening/closing characteristics, T
B...Period, T2...Specified Unexamined Patent Publication. Patent applicant: Victor Japan Co., Ltd., l'? Representative Odori Part 9 = '=:: '' : 1:2 唔 1 图 2 卆 2 Mother shore 3 Fig. O 4 Listening 5 groups

Claims (2)

[Claims] (1) First and second shutter elements are provided, each of which has a polarizing plate on both sides of each of a pair of liquid crystal elements, and has a shutter function by applying a drive signal to the liquid crystal element; and the second shutter element are configured such that the opening and closing states of the shutter function are reversed in response to the same drive signal, and shutters in which the first and second shutter elements are laminated are provided on the left and right sides. LCD glasses for stereoscopic images. (2) First and second shutter elements are provided, each of which has a polarizing plate on both sides of each of the pair of liquid crystal elements, and has a shutter function by applying a drive signal to the liquid crystal element; and a second shutter element are configured so that the opening and closing states of the shutter function are reversed in response to the same drive signal, and a three-dimensional image liquid crystal display is provided with shutters on the left and right sides in which the first and second shutter elements are laminated. 2nd pair of glasses
The drive signal for driving the shutter element is such that the voltage application time during the drive signal is delayed by π/2 and is shortened by a predetermined value with respect to the drive signal for the first shutter element. A method for driving liquid crystal glasses for stereoscopic images, characterized by the following.