KR20150103969A - A modulator for an autostereoscopic device and a control method of the modulator - Google Patents

A modulator for an autostereoscopic device and a control method of the modulator Download PDF

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Publication number
KR20150103969A
KR20150103969A KR1020140025711A KR20140025711A KR20150103969A KR 20150103969 A KR20150103969 A KR 20150103969A KR 1020140025711 A KR1020140025711 A KR 1020140025711A KR 20140025711 A KR20140025711 A KR 20140025711A KR 20150103969 A KR20150103969 A KR 20150103969A
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KR
South Korea
Prior art keywords
electrode
electrodes
center
voltage
liquid crystal
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KR1020140025711A
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Korean (ko)
Inventor
조성호
이철우
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유한회사 마스터이미지쓰리디아시아
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Application filed by 유한회사 마스터이미지쓰리디아시아 filed Critical 유한회사 마스터이미지쓰리디아시아
Priority to KR1020140025711A priority Critical patent/KR20150103969A/en
Priority to JP2016554841A priority patent/JP2017513045A/en
Priority to CN201580016858.XA priority patent/CN106164751A/en
Priority to PCT/KR2015/000963 priority patent/WO2015133732A1/en
Priority to US15/122,932 priority patent/US9948925B2/en
Priority to EP15758266.9A priority patent/EP3115828A4/en
Publication of KR20150103969A publication Critical patent/KR20150103969A/en

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Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a modulator for a stereoscopic image apparatus and a control method of the modulator, and more particularly, to an invention capable of minimizing a crosstalk phenomenon of a stereoscopic image.
According to another aspect of the present invention, there is provided a plasma display panel comprising a first substrate and a second substrate spaced apart from the first substrate; A first electrode and a second electrode provided between the first and second substrates; And a liquid crystal unit provided between the first electrode and the second electrode, wherein the first electrode or the second electrode is divided into a plurality of electrodes so that a plurality of different voltages can be applied, A modulator for a stereoscopic image apparatus and a control method thereof are provided.

Description

[0001] The present invention relates to a modulator for a stereoscopic image apparatus and a control method of the modulator for a stereoscopic image apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a modulator for a stereoscopic image apparatus and a control method of the modulator, and more particularly, to an invention capable of minimizing a crosstalk phenomenon of a stereoscopic image.

FIG. 1 shows a schematic diagram of a stereoscopic image implementing method using a general projector 1, a modulator 2, and a stereoscopic glasses 4.

The image generated by the projector is converted into linearly polarized light and transmitted through the modulator 2 and the modulator 2 is driven by a signal interlocked with the projector 1 so that the linearly polarized image becomes a clockwise or counterclockwise circularly polarized light A stereoscopic image is realized through the stereoscopic glasses 4 after being reflected from the screen.

Fig. 2 shows a basic configuration of a conventional modulator 2. The linearly polarized incident light passes through the transparent substrate 9 and the transparent electrode 8 and passes through the LCD (Liquid Crystal Display) 7 and then exits through the transparent electrode 6 and the transparent substrate 5.

The transparent electrodes 6 and 8 that are spaced apart from each other are driven by different voltages by the voltage driving device 10 to turn the emitted light into a clockwise or counterclockwise circularly polarized light.

FIG. 3 shows the path of light in an LCD (OCB: Optically Compensated Bend) according to incident angles.

That is, when the incident angle is not perpendicular to the LCD 13 but has an angle? 1 , the difference between the thickness d of the LCD 13 and the distance l actually passing through the LCD 13, that is, (1d) is as follows.

ℓ-d = d (1 / Cos [ASin {(n 1 / n 2) Sinθ 1}] - 1) ( Equation 1)

Where n 1 is the index of refraction of air 1 and n 2 is the index of refraction of the LCD.

Figure 4 shows an optical path difference (ℓ-d) / d for a change in the incidence angle θ 1 by the equation (1).

In FIG. 4, the optical path difference 0% is a case where light is incident perpendicularly to the LCD 4, and when the incident angle is large,? Is larger than d and the optical path difference is increased.

The maximum incident angle is determined by the TR (Throw ratio) of the stereoscopic image system. For example, when the TR is 1.5 and 1.3, the maximum incident angle is about 18 degrees and 21 degrees, respectively.

Therefore, the optical path difference corresponds to 2.1% (for 18 degrees) and 3.0% (for 21 degrees), and the polarization conversion efficiency is proportional to the above optical path difference, so that a phase delay occurs between these optical paths. The circular polarization conversion efficiencies of the light passing through the central part and the outermost part of the diffraction grating differ by 2.1% and 3.0%, respectively.

TR is 1.3, and the average value of each optical path difference at an incident angle of 1 to 24 degrees is 1.4%.

Due to this difference, cross-talk that is received in the left / right eye of the stereoscopic glasses 4 occurs, so that a clear stereoscopic image quality can not be obtained.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a modulator for a stereoscopic image apparatus capable of reducing a crosstalk phenomenon occurring in a center portion and an outer frame portion of a stereoscopic image.

According to an aspect of the present invention, there is provided a plasma display panel comprising a first substrate and a second substrate spaced apart from the first substrate, a first electrode and a second electrode provided between the first and second substrates, And a liquid crystal unit provided between the electrode and the second electrode, wherein the first electrode or the second electrode is divided into a plurality of electrodes so that a plurality of different voltages can be applied, A modulator for a stereoscopic image apparatus is provided.

According to another aspect of the present invention, there is provided a liquid crystal display comprising first and second electrodes, and a liquid crystal unit disposed between the first and second electrodes, wherein the first electrode or the second electrode comprises a plurality of electrodes that are mutually insulated, And applying different voltages to the electrodes of the stereoscopic image display device.

According to the present invention, by separating the electrodes by intervals, separating the electrodes, and applying different voltages to each interval, the phase delay of the polarization due to the optical path difference in the modulator and the resulting crosstalk can be remarkably reduced .

That is, a low voltage is applied to the central portion of the electrode, and a high voltage is applied to the outer portion of the electrode to vary the pattern of the liquid crystal in each region, thereby varying the degree of phase delay according to the region. The phase delay can be reduced.

Through this, it is possible to obtain a high quality stereoscopic image by minimizing the crosstalk generated in the central part and the outer part of the stereoscopic image.

1 is a structural view of a stereoscopic image apparatus including a modulator.
2 is a cross-sectional view of a modulator according to the prior art.
3 shows a liquid crystal pattern formed in a conventional modulator.
4 is a graph showing a change in optical path difference according to a change in an incident angle in a conventional modulator.
5 is a cross-sectional view of the modulator of the present invention.
6 is a plan view of mutually isolated electrodes applied to the modulator of the present invention.
7 illustrates a liquid crystal pattern according to an embodiment of the present invention.
FIG. 8 is a graph showing changes in optical path difference and phase according to the change of the incident angle in the present invention and the prior art.
9 is a partial cross-sectional view of the modulator of the present invention.
FIG. 10 shows the progress of light passing through the modulator during driving of the modulator of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

5, the modulator according to the embodiment of the present invention includes a first substrate 39 and a second substrate 35 which form an outer surface of the first substrate 39 and the first and second substrates 35 and 39, It is made of transparent material.

A first electrode 38 and a second electrode 36 are provided between the first substrate 39 and the second substrate 35 and the first electrode 38 and the second electrode 36 are formed between the first substrate 39 and the second substrate 35, A liquid portion 37 is provided.

One of the first electrode 38 and the second electrode 36 functions as a common electrode and the other functions as a divided electrode so that voltages of different potentials can be applied to the divided electrodes For this, each of the divided electrodes is preferably in an insulated state.

The first electrode 38 and the second electrode 36 are transparent electrodes and may be formed of a transparent conductive inorganic material such as ITO (indium tin oxide) or ZnO.

5, when the first electrode 38 serves as a common electrode and the second electrode 36 serves as a divided electrode, an electrode disposed at the center of the second electrode 36 is referred to as a center electrode 20, And the electrodes disposed on the outside are defined as the outer electrodes 16, 17, 18, 19, 21, 22, 23, 24.

However, the second electrode 36 may be a common electrode, the first electrode 38 may be a divided electrode, and the first and second electrodes 36 and 38 may be divided electrodes.

6 is a plan view showing a state in which the center electrode 20 and the outer electrodes 16, 17, 18, 19, 21, 22, 23, and 24 are disposed.

Preferably, the center electrode and the outer electrode are separated and insulated from each other, and the outer electrodes are also separated from each other and insulated from each other.

Here, the center electrode 20 and the outer electrodes 16, 17, 18, 19, 21, 22, 23, and 24 are driven by applying different voltages to each other.

Outer electrodes 16, 17, 18, 19, 21, 22, 23, and 24 are disposed around the center electrode 20 with the center electrode 20 as a center

It is preferable that the arrangement of each electrode of the modulator 30 is a shape of a circular shape which is cut out in a concentric shape and its outer shape is a rectangle having a long transverse length, And for the sake of ease of connection of a connector for supplying power.

The center electrode 20 has a small incident angle of light and the outer electrodes 16, 17, 18, 19, 21, 22, 23 and 24 have a relatively large incident angle of light.

A plurality of outer electrodes 16, 17, 18, 19, 21, 22, 23, and 24 are disposed on both sides of the center electrode 20 and a shape symmetrical with respect to the center electrode 20 .

Particularly, it is preferable that the same voltage is applied to the outer electrodes that are the same distance from the center electrode 20. This is because the outer electrodes (for example, the 21st outer electrode And the incident angle of the light incident on the outer electrode (for example, the 19th display outer electrode), which is distant from the left by a first distance, is the same.

16, 24, 17, 23, 18, 22 and 19, which are symmetrical to each other with respect to the center electrode 20 and spaced the same distance from the center electrode 20 And 21 are arranged in a pair, and it is preferable that the same voltage is applied to them.

It is preferable that the voltage applied to the center electrode 20 is lower than the voltage applied to the outer electrodes 16, 17, 18, 19, 21, 22, 23, 24, It is preferable that the applied voltage be formed to be high.

When the applied voltage is high, the retardation is small and when the applied voltage is relatively low, the phase delay becomes large. In FIG. 7 (a), the first and second electrodes 36 and 38 The alignment state of the liquid crystal due to the high potential difference appears, and in FIG. 7 (b), the liquid crystal alignment state due to the low potential difference between the first and second electrodes 36 and 38 due to the relatively low applied voltage appears.

6, when a higher voltage is applied to the outer electrodes 16, 17, 18, 19, 21, 22, 23 and 24 from the center electrode 20, 7 (b) is formed on the liquid crystal 37 corresponding to the outer electrodes 16, 17, 18, 19, 21, 22, 23, ) Are formed in the liquid crystal alignment state.

For example, 5 V is applied to the center electrode 20, 5.4 V for the outer electrodes, 5.2 V for the numerals 19 and 21, 5.4 V for the 18 and 22, 5.6 V for the 17 and 23, 5.8 V to increase the phase delay at the central portion of the modulator 30 than the outer portion of the modulator 30 and thereby reduce the phase delay due to the optical path difference at the outer portion and the central portion .

FIG. 8 shows a graph of the optical path difference as a result of optimizing the voltage applied to the electrode shown in FIG.

Here, (A) is a graph of the optical path difference change according to the prior art, and (B) is a graph of the phase shift according to the present invention.

(B) shows a phase delay when the voltage applied to the modulator is adjusted according to the section to generate optimal circularly polarized light.

(B), the optical path difference curve is serrated to correspond to the section where the electrodes are separated. The slope rising in the serration corresponds to the slope corresponding to each section in (A).

The curve (B) in FIG. 8 shows that although the incident angle increases, the optical path difference is changed within a certain range, and the difference is remarkable in comparison with the prior art in which the optical path difference increases as the incident angle increases.

That is, in the case of (A), the optical path difference continuously increases as the incident angle increases in the state where the same voltage is applied to the electrodes.

(B), the portion where the optical path difference is drastically lowered means a portion between the isolated center electrode and the outer electrode or between the outer electrode and the outer electrode.

The reason why the optical path difference does not exceed a certain level is that the applied voltages are made different from each other depending on the position (center or outline) of the electrodes as described above.

The slope of the rising curve among the sawtooth curves shown in (B) is the slope by the optical path difference calculation formula (Equation 1), and the optical path difference value is almost vertically decreased at the boundary where the electrodes are separated, And then repeats the falling pattern at the next boundary.

In order to optimize this, it is possible to set the electrode interval in consideration of the size of the electrode and the allowable cross-talk, and then change the voltage so as to subtract the crosstalk average value in each interval. When the interval is divided into six, ) Can be obtained.

The influence of the crosstalk due to the optical path difference can be expressed by the ratio of the area in each curve. When the ratio of the area under the curve (A) to the area under the curve (B) is calculated, The area of the lower space of the curve (A) is reduced compared to the area of the space below the curve (A).

As shown in FIG. 9, an interval t is set between the mutually separated electrodes so that different voltages can be applied to the electrodes separated from each other, and the size of the interval is set to be smaller than the light flux passing through the modulator It can be set to be several to several tens of micrometers so that the influence can be minimized.

Fig. 10 shows the movement path of light according to the operation of the present invention.

Light from the projector is diffused and is incident on the modulator 30.

At this time, the applied voltage increases from the center electrode 20 of the second electrode 36 of the modulator 30 to the outer electrodes 16 to 29 and 21 to 24.

Since the applied voltage between the center and the outer periphery is changed as described above, the potential difference between the second electrode 36 and the first electrode 38 increases from the center to the outer periphery.

As described above, when the potential difference is small, the phase delay amount of the liquid crystal portion 37 becomes large, and when the potential difference becomes large, the phase delay amount of the liquid crystal portion 37 becomes small.

Accordingly, the path of the light incident on the central portion and the path of the light incident on the outer portion do not change according to the potential difference. However, since the potential difference applied to these portions is used to compensate for the phase delay caused by such light path difference, The passing light does not differ from the phase of the light passing through the central portion of the liquid crystal portion.

Those skilled in the art will appreciate that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

Therefore, it is to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

16, 17, 18, 19, 21, 22, 23, 24: outer electrodes
20: center electrode
36: second electrode 38: first electrode

Claims (10)

A second substrate spaced apart from the first substrate and the first substrate;
A first electrode and a second electrode provided between the first and second substrates;
And a liquid crystal unit provided between the first electrode and the second electrode,
Wherein the first electrode or the second electrode is divided into a plurality of electrodes so that a plurality of different voltages can be applied to the first electrode or the second electrode. The method according to claim 1,
The first electrode or the second electrode;
A center electrode, and an outer electrode spaced apart from the center electrode and disposed outside the center electrode,
Wherein the center electrode and the outer electrode are disposed so as to be insulated from each other. 3. The method of claim 2,
Wherein the outer electrodes are composed of a plurality of outer electrodes spaced apart from each other,
And each of the outer electrodes is disposed so as to be insulated from each other. 3. The method of claim 2,
Wherein the voltage applied to the outer electrode is controlled to be higher than the voltage applied to the center electrode. 3. The method of claim 2,
Wherein the outer electrodes are symmetrically arranged with respect to the center electrode,
Wherein the same voltage is applied to the outer electrodes at the same distance from the center electrode. The method according to claim 1,
When different voltages are applied to the first electrode or the second electrode,
The liquid crystal patterns formed on the liquid crystal layer are formed in different patterns corresponding to different voltage applied portions,
Wherein a phase delay amount occurring in a liquid crystal pattern corresponding to an electrode portion to which a relatively high voltage is applied is smaller than a phase delay amount occurring in a liquid crystal pattern corresponding to an electrode portion to which a relatively low voltage is applied, . The method according to claim 1,
The amount of the voltage applied from the central portion of the first electrode or the second electrode to the outer portion is increased,
Wherein a phase delay amount of light passing through the center portion of the liquid crystal portion from the central portion to the outer portion is reduced. First and second electrodes, and a liquid crystal unit disposed between the first and second electrodes,
Wherein the first electrode or the second electrode is composed of a plurality of electrodes that are mutually insulated,
And applying different voltages to a plurality of electrodes that are mutually insulated from each other. 9. The method of claim 8,
Wherein the plurality of electrodes include a center electrode and an outer electrode disposed at an outer periphery of the center electrode,
The step of applying different voltages to the plurality of electrodes comprises:
Applying a first voltage to the center electrode;
And applying a second voltage higher than the first voltage to the outer electrodes. 10. The method of claim 9,
The step of applying different voltages to a plurality of mutually insulated electrodes
Wherein the controller controls the voltage applied to the first electrode or the second electrode from the center to the outer periphery to be higher.
KR1020140025711A 2014-03-04 2014-03-04 A modulator for an autostereoscopic device and a control method of the modulator KR20150103969A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
KR1020140025711A KR20150103969A (en) 2014-03-04 2014-03-04 A modulator for an autostereoscopic device and a control method of the modulator
JP2016554841A JP2017513045A (en) 2014-03-04 2015-01-29 Modulator for stereoscopic video apparatus and stereoscopic video apparatus using the same
CN201580016858.XA CN106164751A (en) 2014-03-04 2015-01-29 Manipulator and the stereoscopic image devices of this manipulator of use for stereoscopic image devices
PCT/KR2015/000963 WO2015133732A1 (en) 2014-03-04 2015-01-29 Modulator for stereoscopic image device and stereoscopic image device using same
US15/122,932 US9948925B2 (en) 2014-03-04 2015-01-29 Modulator for stereoscopic image device and stereoscopic image device using same
EP15758266.9A EP3115828A4 (en) 2014-03-04 2015-01-29 Modulator for stereoscopic image device and stereoscopic image device using same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020140025711A KR20150103969A (en) 2014-03-04 2014-03-04 A modulator for an autostereoscopic device and a control method of the modulator

Publications (1)

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KR20150103969A true KR20150103969A (en) 2015-09-14

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