JP3835926B2 - Liquid crystal optical switch device, driving method thereof, and stereoscopic image display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid crystal optical switch device and a driving method thereof. The present invention also relates to a stereoscopic image display device.
[0002]
[Prior art]
Conventional Example 1
Conventionally, as a display device using a liquid crystal optical switch, for example, Japanese Patent Laid-Open No. 61-87130 (US Pat. No. 4,652,087) discloses a field using a liquid crystal optical switch device as shown in FIG. A sequential color display system (A10) is known.
[0003]
FIG. 26 is a timing chart showing a control signal and a drive signal for driving a liquid crystal cell segment in such a display system, a state of the cell segment, and a display state of the color display system.
[0004]
As shown in FIG. 25, the color display system A10 includes a liquid crystal element, that is, a variable optical retarder A12. The color display system A10 is optically related to the color selection polarizing filter A14 and the colorless polarizing filter A16, and is disposed between these filters. Yes. The input surface A18 side of the variable optical retarder A12 is configured by a common electrode structure A22, and the output surface A26 side is divided into two separation electrode structures A30 and A32 along a horizontal non-conductive separation line A28 (dotted line portion). Has been. As shown in FIG. 25, the upper first cell segment A34 is constituted by the electrode structures A22 and A30, and the lower second cell segment A36 is constituted by the electrode structures A22 and A32.
[0005]
Hereinafter, the structure of the liquid crystal element A12 in Conventional Example 1 will be described with reference to FIGS.
27 is a plan view of the liquid crystal element A12 of the color display system A10, and FIG. 28 is a side sectional view of the liquid crystal element A12 shown in FIG. 27 viewed from the right side.
[0006]
As shown in these drawings, in the liquid crystal element A12 (liquid crystal cell D100), the liquid crystal cell D100 includes a common electrode structure D102 that is substantially parallel to a pair of electrode structures that are separated and adjacent to each other, and a first electrode structure D104. And the second electrode structure D108. The upper half of FIG. 27 shows the first electrode structure D104, and the lower half shows the second electrode structure D108. Further, the left side of the lower electrode in FIG. 28 is the first electrode structure D104, and the right side is the second electrode structure D108.
[0007]
In the space between the electrode structure D102 and the electrode structures D104 and D108, a continuous region of the nematic liquid crystal material D110 is provided. The electrode structure D102 has a substantially flat common glass dielectric substrate D112, and a conductive transparent material layer (transparent electrode layer) D114 such as indium tin oxide is provided on the inner surface thereof.
[0008]
Similarly, the electrode structures D104 and D108 have a substantially flat common glass dielectric substrate D118, and two transparent electrode layers D120 and D122 adjacent to each other are provided on the inner surface thereof. The conductive region D120 is a part of the first electrode structure D104, and the conductive region D122 is a part of the second electrode structure D108. That is, the conductive regions D120 and D122 are separated by a linear non-conductive gap, that is, a separation line D124.
[0009]
The spacer D128 is made of a material such as a polyester film or a melted glass frit, and maintains a constant distance between the glass substrates D112 and D118. The portions within the dotted lines shown in FIGS. 27 and 28 are the cell segments D130 and D132. Specifically, the portion where the electrode structures D102 and D104 overlap is the first cell segment D130, and the portion where the electrode structures D102 and D108 overlap is the second cell segment D132.
[0010]
Next, the color display method of Conventional Example 1 will be described.
The color selection polarization filter A14 has orthogonal polarization states, and passes light of only the first color in one polarization state, and passes light of only the second color in the other polarization state. The colorless polarizing filter A16 has two orthogonal polarization states, and passes light of all colors in one polarization state and absorbs light of all colors in the other polarization state. In this color display system, the polarizing filters A14 and A16 have linear polarization axes arranged at right angles to each other.
[0011]
The optical assembly consisting of variable optical retarder A12 and polarizing filters A14, A16 acts as a fast color switch, and the light source, ie image source A38, generates light from phosphor screen A40 and has two basic colors, eg red and red. Make a green light image. In this color display system, the image source A38 is a television type cathode ray tube (CRT) by raster scanning, and the signal generated by the raster generator A42 in response to the output of the frame synchronization circuit A44 is a sequential frame of image information. Is displayed. Each frame includes two fields of image color information that alternately become the first and second color field periods. Note that the image source A38 may be not only an interlaced monitor but also a non-interlaced display device such as a display monitor used as a display device such as a computer.
[0012]
In the first color field period, both the shape of an arbitrary image represented by a first color, for example red, and the shape of an arbitrary image represented by a combination of red and a second color, for example green, are related Information to be written on the phosphor screen A40. In the second color field period, information related to both the shape of an arbitrary image represented by green and the shape of an arbitrary image represented by a combination of red and green is written in the phosphor screen A40. The color selective polarizing filter A14 receives light from the phosphor screen A40 and polarizes this light orthogonally and linearly for red and green. The polarized light is then transmitted to the input surface A18 of the variable optical retarder A12.
[0013]
The switching means or circuit A46 uses the output signal of the frame synchronization circuit A44 as an input signal, and the two cell segments A34, A36 of the variable optical retarder A12 in synchronization with the sequential frame rate of the image information generated by the image source A38. Drive. That is, in each image frame, the switching circuit A46 creates two types of control signals and drive signals as shown in FIG. 26, and supplies two signals A48 and A50 to each cell segment by the two drive circuits. The color of the light output from the color display system is controlled to be a desired color.
[0014]
That is, during the first color field, the switching circuit A46 places the cell segments A34 and A36 of the variable optical retarder A12 into a partially open state or “off state”. In the optical axis direction of the cell segment in the off state, the green light that has passed through the polarizing filter A14 undergoes a half-wave retardation (referred to as birefringence or optical delay), and during this period, green light is emitted. Light does not pass through the colorless polarizing filter A16, and the green unnecessary image component appearing on the phosphor screen A40 is removed.
[0015]
Also, during the second color field period, the switching circuit A46 puts the cell segments A34 and A36 of the variable optical retarder A12 into the field light distribution state, that is, the “ON state”. In the optical axis direction of the cell segment in the ON state, substantially zero retardation is obtained with respect to the green light that has passed through the polarizing filter A14. During this period, the red light does not pass through the colorless polarizing filter A16, and the phosphor. Red unnecessary image components appearing on the screen A40 are removed.
[0016]
FIG. 26A shows the field period of the image frame, and the first color field period is T ₁ To T ₆ Until the second color field is T ₇ To T ₁₁ It is a period until. FIG. 5B shows the light emission state of the portion covered with the cell segment A34 on the upper side of the variable optical retarder A12 in the phosphor screen A40 of the image source A38. FIG. 5G shows the light emission state of the portion covered by the lower cell segment A36. In the switching circuit A46, a control signal as shown in FIG. 10C and FIG. 10H is generated, and with the drive waveforms shown in FIG. The segments A34 and A36 are driven. In Conventional Example 1, since the liquid crystal material of the variable optical retarder A12 that is a liquid crystal element is a nematic liquid crystal, the drive waveform is a rectangular wave pulse as shown in FIG. 26, but the control of the retardation state of the liquid crystal element is as follows. The control signals are as shown in FIG. 6C and FIG.
[0017]
In the above color display system, each of the first and second color field periods is controlled by being divided into first and second sub-periods in order to shorten the time between consecutive color fields. That is, as shown in FIG. 26, the first sub-period of the first color field is represented by T ₁ To T _Four Until the second sub-period is T _Four To T ₆ And the first sub-period of the second color field is T ₆ To T ₈ Until the second sub-period is T ₈ To T ₁₁ It is controlled as a period until.
[0018]
The screen A40 of the image source (CRT) A38 is formed of a phosphor, and usually a certain time (afterglow time) is required until the emitted light is sufficiently extinguished by irradiation with an electron beam as shown in FIG. And In the color display system of Conventional Example 1, the control signal falling timing is set to T ₁ To T ₂ Period and T ₈ To T ₉ Until the light emitted from the phosphor is sufficiently extinguished, the retardation state of the variable optical retarder A12 is changed to ensure the color continuity of the composite image in each color field.
[0019]
In the variable optical retarder A12, which is a liquid crystal element, a period of an intermediate state (transient state) from when the drive signal is changed to change the retardation state until the change is completed exists for a certain time as shown in FIG. Yes. In the color display system of the first conventional example, T before the electron beam starts scanning and light is emitted from the phosphor of the screen A40. _Five To T ₆ Period and T ₇ To T ₈ Until the rising timing of the control signal is advanced until the change of the retardation state of the variable optical retarder A12 is stabilized, a time margin is provided so that light from the phosphor is emitted.
[0020]
The retardation state of the variable optical retarder A12 driven as described above changes as shown in FIGS. 26 (G) and (K). Therefore, the color display system of Conventional Example 1 outputs light of the colors shown in FIGS. (F) and (L) and displays a color image.
[0021]
FIGS. 29 and 30 are diagrams showing horizontal scanning and vertical scanning of the raster of the image source A38, respectively. The raster E1 in the phosphor screen A40 is displayed by scanning the horizontal scanning line E2 and the horizontal blanking line E3 which are scanned in the horizontal direction shown in FIG. 29 in the vertical direction as shown in FIG. FIG. 31 is a diagram showing the vertical screen position and the light emission state in consideration of the vertical scanning and the afterglow time of the phosphor screen A40.
[0022]
FIG. 32 is a diagram showing the vertical screen position and the light emission state when the liquid crystal element A12 is divided and controlled in the vertical direction as in the first conventional example. Since the change in the retardation state of the liquid crystal element A12 must be a period in which the image source A38 is not emitting light or a period in which the light emission is sufficiently extinguished (after the afterglow time) as described above, the change in retardation state is shown in FIG. As shown, it is necessary to perform timing control as shown in FIG. 26 so that the light emission state region and the transient state region do not overlap.
[0023]
Conventional example 2
By the way, in US Pat. No. 5,347,378, by changing the liquid crystal material of the liquid crystal element A12 from the nematic liquid crystal to the ferroelectric liquid crystal having a fast response speed in the conventional example 1, the time of the transient state of the liquid crystal element A12 is increased. It is an example of the shortened liquid crystal optical switch. FIG. 35 is a diagram showing an example of a color display system including the liquid crystal element L12 using this liquid crystal material. The liquid crystal element L12 is composed of one cell segment in which the liquid crystal material is ferroelectric liquid crystal and there is no separation line, and the switching circuit L46 that controls and drives the liquid crystal element L12 has one output (output L48). ), And the remaining output L50 is not used and can be removed. In FIG. 35, the same components as those in FIG. 25 are given the same reference numerals.
[0024]
Ferroelectric liquid crystal materials are liquid crystal materials that have high-speed response characteristics with respect to changes in the retardation state as compared with nematic liquid crystals, as described in “Structure and Physical Properties of Ferroelectric Liquid Crystals”, page 19 of Corona (1990). Thus, the liquid crystal optical switch has a function equivalent to that of the nematic liquid crystal of the first conventional example. In the conventional example 2, a liquid crystal optical switch that operates at a higher speed than the conventional example 1 can be realized by the high-speed response of the ferroelectric liquid crystal.
[0025]
FIG. 36 is a diagram showing the vertical screen position and the light emission state when applied to a color display system using the same image source A38 as in Conventional Example 1 as shown in FIG. As shown in FIG. 36, the transient state time of the liquid crystal element L12 is shortened. The driving waveform L48 of the liquid crystal element L12 at this time is as shown in FIG. 26 (D) or FIG. 26 (J) in the case of the conventional example 1 because the liquid crystal material is changed from a nematic liquid crystal to a ferroelectric liquid crystal. Unlike a rectangular pulse, a control signal voltage pulse as shown in FIG. 26C or FIG.
[0026]
However, since the conventional example 2 has one cell segment, the entire area of the cell segment changes at the same time. Therefore, in the color display system of the conventional example 2 using the image source having afterglow characteristics, the light emission state There is always a region where the region and the transient state region overlap, and the correct color of the composite image in each color field cannot be displayed. Therefore, as in Conventional Example 1, the liquid crystal element is divided into at least two cell segments, and control and driving are performed so that the light emitting state region and the transient state region do not overlap as shown in FIG. There is a need to.
[0027]
[Problems to be solved by the invention]
However, in the field sequential color display system of Conventional Example 1 described above, the variable optical retarder A12 is composed of two upper and lower cell segments, so that a separation line D124 always exists near the center of the color image to be displayed. Since the drive signal from the switching circuit A46 cannot be applied to the part of the separation line D124, the color of the light passing through this part cannot be controlled, and the colors displayed as the cell segments D130 and D132 are different. Therefore, there is a problem that the separation line D124 is easily identified and the quality of the display image is deteriorated.
[0028]
Further, as shown in FIG. 28, the liquid crystal element A12 has a capacitor structure in which one cell segment has a liquid crystal layer D110 sandwiched between transparent electrode layers D114 and D120 or D114 and D122. As the segment becomes larger, its capacity value becomes larger. When the capacitance value of the cell segment is increased, the drive signal of the switching circuit A46 is lost, and there is a problem that the liquid crystal element A12 cannot be driven or the state change time (transient state period) becomes longer. For this reason, when the image source A38 of the color display system in the conventional example 1 is enlarged, the light emission state region and the transient state region overlap as shown in FIG. 33, and the correct color of the composite image in each color field cannot be displayed. Therefore, as shown in FIG. 34 (FIG. 34 shows an example of three divisions), it is necessary to cope with an increase in the number of divisions of the liquid crystal element A12 so that the switching circuit A46 can be driven. There is also a problem that the number of control waveforms and the number of drive circuits in the switching circuit A46 are increased and complicated. In addition, when the number of divisions of the liquid crystal element A12 is increased, the number of separation lines that always exist between the respective cell segments also increases, and there is a problem that the quality of the display image is further deteriorated.
[0029]
Further, as in the above-described conventional example 2, even when a ferroelectric liquid crystal is used, even if there is a fast response characteristic in the change in the retardation state of the liquid crystal element, the entire region of the cell segment changes at the same time. As shown in 36, it is necessary to divide the liquid crystal element into at least two cell segments, and there is a problem that there is always a separation line between the cell segments.
[0030]
The present invention has been made to solve the above-described problems, and uses one cell segment liquid crystal element having no separation line, and controls the voltage applied to the liquid crystal element, thereby displaying the liquid crystal element. It is an object of the present invention to provide a liquid crystal optical switch device capable of changing the surface change state in the vertical direction and a driving method thereof. Furthermore, the present invention provides a liquid crystal optical switch device or a stereoscopic image display device using this liquid crystal optical switch driving method.
[0031]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, a liquid crystal optical switch device according to claim 1 of the present invention is disposed in front of a scanning image output means and restricts light emitted from the scanning image output means. Two transparent electrode layers facing each other, an extraction electrode provided at the upper end and lower end of one transparent electrode layer, and an extraction electrode provided at the left end and right end of the other transparent electrode layer And applying different voltages to the extraction electrodes at the upper and lower ends of the transparent electrode layer, generating a vertical voltage tendency in the transparent electrode layer, and connecting the extraction electrodes at the left and right ends to the outside, And a voltage applying unit that sets the voltage in the electrode layer to the same voltage in the left-right direction and sets the voltage applied to the liquid crystal layer sandwiched between the two transparent electrode layers to different voltages in the up-down direction.
[0032]
Further, in the liquid crystal optical switch device according to claim 2 of the present invention, the voltage applied by the voltage applying means varies the voltage applied to the extraction electrode at the upper end portion or the lower end portion, whereby the voltage applied to the liquid crystal layer differs in the vertical direction It is characterized by a voltage.
[0033]
Further, in the liquid crystal optical switch device according to claim 3 of the present invention, the voltage applied to the liquid crystal layer by changing the voltage applied to the extraction electrodes at the left end and the right end connected externally by the voltage applying means. Are different voltages in the vertical direction.
[0034]
In the liquid crystal optical switch device according to claim 4 of the present invention, the voltage application means changes the voltage applied to the extraction electrode at the upper end or the lower end, and the extraction electrodes at the left end and the right end connected externally. By changing the voltage applied to the liquid crystal layer, the voltage applied to the liquid crystal layer is set to a different voltage in the vertical direction.
[0035]
Further, in the liquid crystal optical switch device according to claim 5 of the present invention, the voltage applying means applies pulse voltages having different phases to the extraction electrodes at the upper end and the lower end, and the pulse voltage waveform of the upper end electrode and the lower end electrode According to the phase difference of the pulse voltage waveform, the voltage applied to the liquid crystal layer is a voltage having a temporal change different in the vertical direction.
[0036]
In the liquid crystal optical switch device according to claim 6 of the present invention, the voltage applying means applies a pulse voltage to the extraction electrode at the upper end, and applies a triangular wave voltage whose voltage changes with time to the extraction electrode at the lower end. The voltage applied to the liquid crystal layer is a voltage having different temporal changes in the vertical direction.
[0037]
Further, in the liquid crystal optical switch device according to claim 7 of the present invention, the voltage applying means applies a pulse voltage to the extraction electrode at the upper end, and applies a triangular wave voltage whose voltage changes with time to the extraction electrode at the lower end. Thus, the voltage applied to the liquid crystal layer is changed to a voltage having different temporal changes in the vertical direction.
[0038]
Further, in the liquid crystal optical switch device according to claim 8 of the present invention, the voltage applying means applies a triangular wave voltage whose voltage changes with time to the externally connected left end portion and right end extraction electrode, whereby the liquid crystal layer The voltage applied to is different in the vertical direction.
[0039]
According to a ninth aspect of the present invention, there is provided a driving method for a liquid crystal optical switch device comprising two opposing transparent electrode layers, extraction electrodes provided at the upper end and lower end of one transparent electrode layer, and the other transparent A driving method for a liquid crystal optical switch device, which has a take-out electrode provided at the left end portion and the right end portion of the electrode layer, is disposed on the front surface of the scanning image output means, and restricts the emitted light from the scanning image output means In this case, different voltages are applied to the extraction electrodes at the upper end and the lower end, a vertical voltage tendency is generated in the transparent electrode, the extraction electrodes at the left end and the right end are connected externally, The voltage is the same voltage in the left-right direction, and the voltage applied to the liquid crystal layer sandwiched between two transparent electrode layers is different in the vertical direction.
[0040]
According to a tenth aspect of the present invention, there is provided a driving method for a liquid crystal optical switch device, wherein the voltage applied to the extraction electrode at the upper end or the lower end is changed to change the voltage applied to the liquid crystal layer from a different voltage in the vertical direction. It is characterized by doing.
[0041]
According to the eleventh aspect of the present invention, there is provided a driving method for a liquid crystal optical switch device in which the voltage applied to the externally connected left end and right end take-out electrodes is changed to increase or decrease the voltage applied to the liquid crystal layer. The voltage is different depending on the direction.
[0042]
A stereoscopic image display apparatus according to a twelfth aspect of the present invention includes a scanning video output means for switching and displaying a right-eye image and a left-eye image in the first and second polarization states, and a scanning video output. The first liquid crystal optical switch means for limiting the outgoing light in the first deflection state from the means, and the second liquid crystal optical switch means for limiting the outgoing light in the second deflection state from the scanning image output means And. The first and second liquid crystal optical switches include two transparent electrode layers facing each other, extraction electrodes provided at the upper end and lower end of one transparent electrode layer, and the left end and right end of the other transparent electrode layer Different voltages are applied to the extraction electrode provided in the upper electrode and the extraction electrode at the upper end and lower end of the transparent electrode layer to generate a vertical voltage tendency in the transparent electrode layer, and the left and right extraction electrodes are externally connected. And a voltage applying means for setting the voltage in the transparent electrode layer to the same voltage in the left-right direction and the voltage applied to the liquid crystal layer sandwiched between the two transparent electrode layers to different voltages in the vertical direction. It is characterized by.
[0043]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a diagram showing a configuration of a field sequential color display system P10 using a liquid crystal optical switch device according to a first embodiment of the present invention.
[0044]
2 is a plan view of the liquid crystal element P12 of the present invention in FIG. 1, and FIGS. 3 and 4 are a side sectional view and a bottom sectional view of FIG. In these drawings, components having the same functions as those of the above-described conventional example are denoted by the same reference numerals.
[0045]
As shown in FIG. 1, the color display system P10 is a color display system in which a CRT for performing raster scanning of a television type is used as an image source A38 as in the conventional example, and the liquid crystal element P12 according to the present invention is used as a variable optical retarder. use. In this system, the liquid crystal element P12 is optically related to the color selection filter A14 and the colorless polarizing filter A16 as in the conventional example, and is disposed between these filters. Controls the color of the output light in the same way as.
[0046]
Next, the structure of the liquid crystal element P12 will be described with reference to FIGS.
[0047]
2, 3 and 4, the two transparent substrates P1 and P2 such as glass are arranged to face each other, and the transparent surfaces of the respective substrates have transparent electrode layers P3 and P4. The liquid crystal material P7 is sandwiched between the transparent electrode layers P3 and P4. In order for the liquid crystal material P7 sandwiched between the transparent electrode layers P3 and P4 to operate as a liquid crystal element, other structures such as an insulating film layer and a spacer are necessary.
[0048]
The transparent electrode layer P3 on one surface of the transparent substrate P1 includes extraction electrodes P5L and P5R at the left end and the right end. These two extraction electrodes are connected externally and become one connection terminal P5 of the liquid crystal element P12.
[0049]
The transparent electrode layer P4 on one surface of the transparent substrate P2 includes extraction electrodes P6T and P7B at the upper and lower ends. These electrodes serve as connection terminals P6 and P7 of the liquid crystal element P12.
[0050]
FIG. 5 is a diagram showing an electrical equivalent circuit of the liquid crystal element P12 having the above-described structure.
The transparent electrode layer P3 can be considered as a resistance layer that spreads uniformly on the surface of the transparent substrate P1, and the resistance per unit length and width (unit sheet) is represented by P. _P3 Then, as shown in FIG. 5, a unit sheet resistance P having two extraction electrodes P5L and P5R is provided. _P3 It can be expressed as a two-dimensional ladder network. Similarly, the transparent electrode layer P4 has a unit sheet resistance P having two extraction electrodes P6T and P7B. _P4 It can be expressed as a two-dimensional ladder network.
[0051]
Further, since the liquid crystal material P7 sandwiched between the transparent electrode layers P3 and P4 functions electrically as a capacitor, the capacitance value per unit sheet is represented by C _P7 Then, as shown in FIG. 5, a unit sheet capacitor C is provided between the nodes of the two-dimensional ladder network of the transparent electrode layers P3 and P4. _P7 Can be expressed as a connected configuration.
[0052]
FIG. 6 is a view showing take-out electrodes P5L and P5R provided on the transparent substrate P1 of the liquid crystal element P12 of the present invention, and take-out electrodes P6T and P7B provided on the transparent substrate P2. On the display surface, five observation points a, b, c, d, and e are shown in the vertical direction.
[0053]
Since the equivalent circuit of the liquid crystal element P12 is configured as shown in FIG. 5, the voltage difference applied to the extraction electrode is divided by the resistance components of the transparent electrode layers P3 and P4.
[0054]
FIG. 7 is a diagram showing the relationship between the equivalent circuit of the resistance component of the transparent electrode layer P4 on the surface of the transparent substrate P2 and the voltages at the five observation points in FIG. 6 divided by this resistance component. The voltages at each observation point are V (a), V (b), V (c), V (d), and V (e), and V (a) and V (e) are taken out from the upper end and the lower end, respectively. This is the voltage applied to the electrodes P6T and P7B.
[0055]
FIG. 8 is a diagram showing an equivalent circuit of the resistance component of the transparent electrode layer P3 on the surface of the transparent electrode P1. In the present invention, since the left and right extraction electrodes P5L and P5R are connected outside the liquid crystal element P12, they have the same voltage at any point.
[0056]
FIG. 9 is a diagram showing a method of applying a voltage to the liquid crystal element P12 in the first embodiment of the present invention. A voltage source X1 applies a voltage V to the extraction electrode P6T at the upper end of the liquid crystal element P12. _T And the voltage -V is applied to the take-out electrode P7B at the lower end by the voltage source X2. _B Apply. Further, the left and right extraction electrodes P5L and P5R of the liquid crystal element P12 are supplied with a voltage V by a variable voltage source X3. _LR Apply.
[0057]
FIG. 10 is a diagram showing the relationship between the voltage applied to the liquid crystal layer of the liquid crystal element P12 and the change in the retardation state. The voltage applied to the liquid crystal layer is a negative voltage value (threshold voltage: V _TH ) Is lower, the retardation state of the liquid crystal element P12 becomes “state 1”, and a positive voltage value (threshold voltage: V _TH ) Is higher, the retardation state of the liquid crystal element P12 is “state 2”. When a voltage between positive and negative threshold voltages is applied to the liquid crystal layer, the retardation state of the liquid crystal element P12 is changed from “state 1” to “state 2” or from “state 2” to “state”. This is a “transition state” in which the state is changed to “1”.
[0058]
FIG. 11A is a diagram showing the vertical position of the liquid crystal element P12 and the voltages of the transparent electrode layers P3 and P4 in the first embodiment. In FIG. 11A, a line Z1 indicates the vertical position and voltage of the transparent electrode layer P4. Lines Z2, Z3, and Z4 indicate that the voltage of the variable voltage source X3 in FIG. _Z2 , V _Z3 And V _Z4 The vertical position and voltage of the transparent electrode layer P3 are shown.
[0059]
FIG. 11B shows the voltage V of the variable voltage source X3. _LR It is a figure which shows about the vertical screen position of the liquid crystal element P12 by and, and its retardation state. Voltage V _LR Is the voltage at the intersection of lines Z1 and Z2, Z1 and Z3, and Z1 and Z4 in FIG. 11A, the voltage applied to the liquid crystal layer is zero. This voltage is zero or positive or negative threshold voltage V _TH (2 * V _TH ) Becomes a “transition state”, “state 1” at a voltage lower than “transition state”, and “state 2” at a higher voltage. For example, “State 1” transmits light incident on the liquid crystal element P12 as it is, and “State 2” emits light incident on the liquid crystal element P12 in a twisted state by 90 degrees.
[0060]
As described above, in this first embodiment, the voltage V3 of the variable voltage source X3. _LR By controlling the retardation, the retardation state can be changed in the vertical direction of the liquid crystal element P12. Specifically, by changing the retardation state, retardation of almost half wavelength is performed on the light incident on the liquid crystal element P12, and the incident light is emitted in a state twisted by 90 degrees, or the liquid crystal element P12 It becomes zero retardation for the light incident on the light, and the incident light is emitted as it is.
[0061]
Embodiment 2. FIG.
FIG. 12 is a diagram showing a voltage application method to the liquid crystal element P12 according to the second embodiment, in which the voltage application method to the liquid crystal element P12 in the first embodiment is changed. A voltage source X1 applies a voltage V to the extraction electrode P6T at the upper end of the liquid crystal element P12. _T And the voltage V is applied to the extraction electrode P7B at the lower end by the variable voltage source BB2. _B Apply. Further, the extraction electrodes P5L and P5R at the left end and the right end of the liquid crystal element P12 are supplied with a voltage VB by a voltage source BB3. _LR Apply.
[0062]
FIG. 13A is a diagram illustrating the vertical screen position of the liquid crystal element P12 and the voltages of the transparent electrode layers P3 and P4 in the second embodiment. In FIG. 13A, a line CC1 indicates the vertical screen position and voltage of the transparent electrode layer P3. The lines CC2, CC3, and CC4 are connected to the voltage V of the variable voltage source BB2 in FIG. _B Are each -V _T ,-(V _T / 2), 0, V _T / 2 and V _T The vertical position and voltage of the transparent electrode layer P4 are shown.
[0063]
FIG. 13B shows the voltage V of the variable voltage source BB2. _B It is a figure which shows about the vertical position of the liquid crystal element P12 by, and its retardation state. Voltage V of variable voltage source BB2 _B Is the same as the voltage at the intersection of lines CC1 and CC2, CC1 and CC3, CC1 and CC4, and CC1 and CC5 in FIG. 13A, the voltage applied to the liquid crystal layer becomes zero. From this voltage 0 state, positive or negative threshold voltage V _TH (2 * V _TH ) Becomes a “transition state”, “state 1” at a voltage lower than “transition state”, and “state 2” at a higher voltage.
[0064]
As described above, in the second embodiment, the voltage V of the variable voltage source BB2 _B By controlling the retardation, the retardation state can be changed in the vertical direction of the liquid crystal element P12. Specifically, by changing the retardation state, retardation of almost half wavelength is performed on the light incident on the liquid crystal element P12, and the incident light is emitted in a state twisted by 90 degrees, or the liquid crystal element P12 It becomes zero retardation for the light incident on the light, and the incident light is emitted as it is.
[0065]
Embodiment 3 FIG.
FIG. 14 is a diagram illustrating voltage waveforms applied to the upper electrode P6 and the lower electrode P7 to the liquid crystal element P12 of the third embodiment, in which the voltage application method to the liquid crystal element P12 in the first embodiment is changed. is there.
[0066]
14A shows the pulse voltage waveform applied to the upper connection terminal P6 of the transparent electrode P4 of the liquid crystal element P12 in FIG. 1, and FIG. 14B shows the pulse voltage waveform applied to the lower connection terminal P7. is there. Further, the upper electrode driving pulse (FIG. 14A) and the upper electrode driving pulse (FIG. 14B) have a phase difference (time difference: t ₂ -T ₁ )have.
[0067]
FIG. 15 shows the inside of the transparent electrode P4 divided by the resistance component of the transparent electrode layer P4 when the two drive voltage waveforms shown in FIG. 14 are applied from the upper connection terminal P6 and the lower connection terminal P7 of the liquid crystal element P12. FIG. 7 is a diagram illustrating the voltages of the five observation points in FIG. 6.
[0068]
14 and 15, two horizontal broken lines indicate the threshold voltage (−V of the retardation state change of the liquid crystal element P12. _TH And V _TH ).
[0069]
16 shows the retardation of the liquid crystal element P12 at the five observation points in FIG. 6 when the two drive voltage waveforms shown in FIG. 14 are applied from the upper connection terminal P6 and the lower connection terminal P7 of the liquid crystal element P12. It is a figure which shows a state about the case where there is no transient response state of a liquid crystal element (upper stage), and the case where there exists a transient response state (lower stage).
[0070]
In FIG. 16, the transient response state is “while the retardation state of the liquid crystal element P12 changes from“ state 1 ”to“ state 2 ”, or while the state changes from“ state 2 ”to“ state 1 ”. It is the time that is “transition state”.
[0071]
FIG. 17 is a diagram continuously showing the retardation state of the liquid crystal element P12 at the five observation points in FIG. 6 shown in FIG. 16 in the vertical direction.
[0072]
In the third embodiment, as shown in FIG. 17, a pulse that gives the start timing of the “transition state” of the upper and lower retardation states of the liquid crystal element P12 to the upper connection terminal P6 and the lower connection terminal P7 of the liquid crystal element P12. Since it can be delayed by the phase difference of the voltage waveform, it is possible to control so that the light emitting state region of the image source A38 shown in FIG. 31 and the transient state region of the retardation state change of the liquid crystal element P12 do not overlap. That is, it can be controlled so that the afterglow time region of FIG. 31 and the transition state region of FIG. 17 do not overlap. Therefore, it is possible to realize a field sequential color display system P10 using the liquid crystal element P12 having no dividing line.
[0073]
Embodiment 4 FIG.
FIG. 18 is a diagram illustrating voltage waveforms applied to the upper electrode P6 and the lower electrode P7 to the liquid crystal element P12 according to the fourth embodiment, and voltage application to the liquid crystal element P12 according to the first embodiment. It is a modified method.
[0074]
FIG. 18A shows a pulse voltage waveform applied to the upper connection terminal P6 of the transparent electrode P4 of the liquid crystal element P12 in FIG. 1, and FIG. 18B also shows a triangular wave voltage that changes with time applied to the lower connection terminal P7. It is the figure which showed the waveform.
[0075]
FIG. 19 shows the inside of the transparent electrode P4 divided by the resistance component of the transparent electrode layer P4 when the two drive voltage waveforms shown in FIG. 18 are applied to the upper connection terminal P6 and the lower connection terminal P7 of the liquid crystal element P12. FIG. 7 is a diagram illustrating the voltages of the five observation points in FIG. 6.
[0076]
In FIG. 19 and FIG. 18, two broken lines in the horizontal direction indicate the threshold voltage (−V of the retardation state change of the liquid crystal element P12. _TH And V _TH ).
[0077]
20 shows the retardation of the liquid crystal element P12 at the five observation points in FIG. 6 when the two drive voltage waveforms shown in FIG. 18 are applied to the upper connection terminal P6 and the lower connection terminal P7 of the liquid crystal element P12. It is the figure which showed the state about the case where there is no transient response state of a liquid crystal element (upper stage), and the case where there exists a transient response state (lower stage).
[0078]
In FIG. 20, the transient response state is a time during which the retardation state of the liquid crystal element P12 is “transition state” while the state changes from “state 1” to “state 2” or from “state 2” to “state 1”. That's it.
[0079]
FIG. 21 is a diagram continuously showing the retardation state of the liquid crystal element P12 at the five observation points in FIG. 6 shown in FIG. 20 in the vertical direction.
[0080]
In the fourth embodiment, the start timing of the “transition state” of the upper and lower retardation states of the liquid crystal element P12 is given to the upper connection terminal P6 of the liquid crystal element P12 as a pulse voltage waveform, and further to the lower connection terminal P7. By giving a triangular wave voltage waveform that changes with time, a difference is caused in the voltage applied to the upper and lower liquid crystal layers, and as shown in FIG. 21, the “transition state” of the upper and lower retardation states of the liquid crystal element P12. As in the third embodiment, the light emission state region of the image source A38 and the transient state region of the retardation state change of the liquid crystal element P12 shown in FIG. 31 can be controlled so as not to overlap with each other. It becomes possible. Therefore, it is possible to realize a field sequential color display system P10 using the liquid crystal element P12 having no dividing line.
[0081]
Furthermore, in the fourth embodiment, since the transition state region of the retardation state change of the liquid crystal element P12 can be controlled by the voltage difference between the voltages applied to the upper connection terminal P6 and the lower connection terminal P7, a triangular wave applied to the lower connection terminal P7. By changing the voltage change time (slope of the triangular wave) of the voltage, the moving time from the upper part to the lower part of the transition state region of the retardation state change of the liquid crystal element P12 can be changed, and the control thereof becomes possible. The light emission state region of the image source A38 and the transient state region of the retardation state change of the liquid crystal element P12 can be accurately controlled.
[0082]
Embodiment 5 FIG.
FIG. 22 is a diagram showing voltage waveforms applied to the upper electrode P6 and the lower electrode P7 to the liquid crystal element P12 according to the fifth embodiment, and voltage application to the liquid crystal element P12 according to the fourth embodiment. It is a modified method.
[0083]
22A is a pulse voltage waveform applied to the upper connection terminal P6 of the transparent electrode P4 of the liquid crystal element P12 in FIG. 1, and FIG. 22B is a triangular wave voltage waveform that similarly changes with time applied to the lower connection terminal P7. is there. As in the third embodiment, there is t between the pulse voltage waveform at the upper connection terminal P6 and the triangular wave voltage waveform at the lower connection terminal P7. _{twenty one} -T _{twenty two} The phase difference is given. If this phase difference is further increased, the start of the state change of the lower part of the liquid crystal element P12 can be further delayed.
[0084]
Embodiment 6 FIG.
FIG. 23 is a diagram illustrating voltage waveforms applied to the upper electrode P6, the lower electrode P7, and the left and right electrodes P5 to the liquid crystal element P12 according to the sixth embodiment, and the liquid crystal element according to the second embodiment. The voltage application method to P12 is changed.
[0085]
FIG. 23 (a) shows a pulse voltage waveform applied to the upper connection terminal P6 of the transparent electrode P4 of the liquid crystal element P12 in FIG. 1, and FIG. 23 (b) shows a pulse voltage waveform applied to the lower connection terminal P7. FIG. 6C is a diagram showing a triangular wave voltage waveform that changes with time applied to the left and right electrodes P5.
[0086]
When a voltage waveform as shown in FIG. 23 is applied to the liquid crystal element P12, the voltage applied to the liquid crystal layer of the liquid crystal element P12 can be changed with time, so that it can be seen from FIGS. 13A and 13B. Thus, the retardation state can be continuously changed in the vertical direction.
[0087]
In the sixth embodiment, a liquid crystal element is obtained by a pulse voltage waveform applied to the upper connection terminal P6 and the lower connection terminal P7 of the transparent electrode P4 of the liquid crystal element P12 and a triangular wave voltage waveform that changes with time applied to the left and right electrodes P5. Since the start timing of the “transition state” of the upper and lower retardation states of P12 can be controlled, the light emission state region of the image source A38 and the transient state region of the retardation state change of the liquid crystal element P12 shown in FIG. It is possible to control so as not to become. Therefore, it is possible to realize a field sequential color display system P10 using the liquid crystal element P12 having no dividing line.
[0088]
Embodiment 7 FIG.
FIG. 24 is a diagram illustrating an example of a configuration of a stereoscopic image display system according to the seventh embodiment of the present invention. This system uses the same liquid crystal element and colorless polarizing filter as in the first embodiment, and uses the same control drive method as that in any of the first to sixth embodiments for liquid crystal. Operate the element. In this stereoscopic image display system, a right-eye image or a left-eye image is switched and displayed by switching the polarization state (horizontal polarization, vertical polarization) of the image. Then, using an eyeglass made up of a right-eye polarizing filter Z18R (for example, horizontally polarized light) and a left-eye polarizing filter Z18L (for example, vertically polarized light) using a colorless polarizing filter, the image from the image output device is used for the right eye or the left eye. It is configured to be separated into video for use. A video viewer can use the glasses or the like to capture the video displayed on the video output device as a stereoscopic image.
[0089]
In the system configured as described above, by using the liquid crystal element and the control driving method according to the first embodiment described above, a stereoscopic image can be displayed using a liquid crystal element without a separation line.
[0090]
【The invention's effect】
In the liquid crystal optical switch device according to the first aspect of the present invention, the voltage application means applies different voltages to the extraction electrodes at the upper end and the lower end to generate a vertical voltage tendency in the transparent electrode, and the left end and the right end The external electrodes are connected externally, the voltage in the transparent electrode is the same voltage in the left-right direction, and the voltage applied to the liquid crystal layer sandwiched between the two transparent electrode layers is different in the vertical direction. The change state of the liquid crystal element can be made different in the vertical direction without separating the liquid crystal element.
[0091]
In the liquid crystal optical switch device according to claim 2 of the present invention, the voltage application means changes the voltage applied to the extraction electrode at the upper end portion or the lower end portion so that the voltage applied to the liquid crystal layer is different in the vertical direction. Thus, the controllability of the voltage in the vertical direction can be improved, and the controllability of the change state in the vertical direction of the liquid crystal element can be improved.
[0092]
In the liquid crystal optical switch device according to claim 3 of the present invention, the voltage application means changes the voltage applied to the extraction electrodes at the left end portion and the right end portion connected externally, thereby changing the voltage applied to the liquid crystal layer in the vertical direction. By using different voltages, the controllability of the voltage in the vertical direction can be improved, and the controllability of the change state in the vertical direction of the liquid crystal element can be improved.
[0093]
In the liquid crystal optical switch device according to claim 4 of the present invention, the voltage application means changes the voltage applied to the extraction electrode at the upper end or the lower end, and applies it to the extraction electrode at the left end and the right end connected externally. By changing the voltage so that the voltage applied to the liquid crystal layer is different in the vertical direction, the accuracy of controlling the voltage in the vertical direction is improved, and the accuracy of controlling the change state in the vertical direction of the liquid crystal element is improved. Can be made.
[0094]
In the liquid crystal optical switch device according to claim 5 of the present invention, the voltage applying means applies pulse voltages having different phases to the extraction electrodes at the upper end and the lower end, and the pulse voltage waveform at the upper end electrode and the pulse voltage at the lower end electrode. By changing the voltage applied to the liquid crystal layer according to the phase difference of the waveform to a voltage having different temporal changes in the vertical direction, the pulse voltage waveform and the phase difference are set appropriately, and the retardation state change of the liquid crystal optical switch device It can be controlled so that the area and the light emitting area of the scanning video output means do not overlap.
[0095]
In the liquid crystal optical switch device according to the sixth aspect of the present invention, the voltage applying means applies a pulse voltage to the extraction electrode at the upper end, and applies a triangular wave voltage whose voltage changes with time to the extraction electrode at the lower end, By appropriately setting the pulse voltage waveform and the triangular wave voltage waveform, the retardation state change region of the liquid crystal optical switch device, and the scanning video output It can control so that the light emission area | region of a means does not overlap.
[0096]
In the liquid crystal optical switch device according to claim 7 of the present invention, the voltage applying means applies a pulse voltage to the extraction electrode at the upper end, and applies a triangular wave voltage whose voltage changes with time to the extraction electrode at the lower end. By giving a voltage waveform and a phase difference, and setting the voltage applied to the liquid crystal layer to a voltage having different temporal changes in the vertical direction, the pulse voltage waveform, the triangular wave voltage waveform and the phase difference are appropriately set, Control can be performed so that the retardation state changing region of the liquid crystal optical switch device does not overlap the light emitting region of the scanning video output means.
[0097]
In the liquid crystal optical switch device according to claim 8 of the present invention, the voltage applying means applies a triangular wave voltage whose voltage changes with time to the extraction electrodes at the left end and the right end connected externally, and is applied to the liquid crystal layer. By setting different voltages in the vertical direction, it is possible to control the start timing of the transition state of the retardation state in the retardation state change direction of the liquid crystal optical switch device, and the retardation state change region of the liquid crystal optical switch device The light emission areas of the scanning video output means can be controlled so as not to overlap.
[0098]
In the driving method of the liquid crystal optical switch device according to the ninth aspect of the present invention, different voltages are applied to the extraction electrodes at the upper end and the lower end, a vertical voltage tendency is generated in the transparent electrode, and the left end and the right end are shifted. By connecting the extraction electrode externally, the voltage in the transparent electrode is the same voltage in the left-right direction, and the voltage applied to the liquid crystal layer sandwiched between the two transparent electrode layers is a different voltage in the vertical direction. The change state of the liquid crystal element can be made different in the vertical direction without separating the elements.
[0099]
In the liquid crystal optical switch device according to the tenth aspect of the present invention, the voltage applied to the liquid crystal layer is changed in the vertical direction by changing the voltage applied to the extraction electrode at the upper end portion or the lower end portion. The controllability of the voltage can be improved, and the controllability of the change state in the vertical direction of the liquid crystal element can be improved.
[0100]
In the liquid crystal optical switch device according to the eleventh aspect of the present invention, the voltage applied to the extraction electrodes at the left end and the right end connected externally is changed so that the voltage applied to the liquid crystal layer is different in the vertical direction. Thus, the controllability of the voltage in the vertical direction can be improved, and the controllability of the change state in the vertical direction of the liquid crystal element can be improved.
[0101]
Further, in the stereoscopic image display device according to claim 12 of the present invention, the voltage applying means gives different voltages to the extraction electrodes at the upper end and the lower end of the transparent electrode layer, and the vertical voltage tendency in the transparent electrode layer is exhibited. The left and right extraction electrodes are connected externally, the voltage in the transparent electrode layer is set to the same voltage in the left-right direction, and the voltage applied to the liquid crystal layer sandwiched between the two transparent electrode layers is changed up and down. Displaying a stereoscopic image using a liquid crystal element capable of making the change state of the liquid crystal element different without separating the liquid crystal element as the first and second liquid crystal optical switch means by setting different voltages depending on directions. Can do.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a field sequential color display system using a liquid crystal optical switch device according to a first embodiment of the present invention.
FIG. 2 is a plan view of the liquid crystal element according to the first embodiment of the invention.
FIG. 3 is a side sectional view of the liquid crystal element according to the first embodiment of the invention.
FIG. 4 is a bottom cross-sectional view of the liquid crystal element according to the first embodiment of the present invention.
FIG. 5 is a diagram showing an electrical equivalent circuit of the liquid crystal element according to the first embodiment of the present invention.
FIG. 6 is a diagram illustrating an extraction electrode and observation points at the left and right central portions of the liquid crystal element according to the first embodiment of the invention.
FIG. 7 is a diagram showing an electrical equivalent circuit between an upper extraction electrode and a lower extraction electrode of the liquid crystal element according to the first embodiment of the present invention, and a voltage at an observation point.
FIG. 8 is a diagram showing an electrical equivalent circuit between left and right extraction electrodes of the liquid crystal element according to the first embodiment of the invention.
FIG. 9 is a diagram showing a method for applying a voltage to the liquid crystal element according to the first embodiment of the present invention.
FIG. 10 is a diagram showing a relationship between a voltage applied to a liquid crystal layer and a change in retardation state of the liquid crystal element according to the first embodiment of the invention.
FIG. 11 is a diagram showing the relationship between the vertical position of the liquid crystal element and the voltage of the transparent electrode layer and the relationship between the vertical position of the liquid crystal element due to the voltage of the variable voltage source and the retardation state in the first embodiment of the present invention. .
FIG. 12 is a diagram illustrating a method for applying a voltage to a liquid crystal element according to a second embodiment of the present invention.
FIG. 13 is a diagram showing the relationship between the vertical position of the liquid crystal element and the voltage of the transparent electrode layer and the relationship between the vertical position of the liquid crystal element due to the voltage of the variable voltage source and the retardation state according to the second embodiment of the present invention; It is.
FIG. 14 is a diagram showing voltage waveforms applied to an upper electrode and a lower electrode of a liquid crystal element according to a third embodiment of the present invention.
FIG. 15 is a diagram illustrating voltages in a transparent electrode layer to which an upper connection terminal and a lower connection terminal of a liquid crystal element according to a third embodiment of the present invention are connected at five observation points.
FIG. 16 is a diagram illustrating a retardation state of a liquid crystal element according to a third embodiment of the present invention at five observation points.
FIG. 17 is a diagram continuously showing a retardation state of a liquid crystal element in a third embodiment of the present invention in the vertical direction.
FIG. 18 is a diagram illustrating voltage waveforms applied to an upper electrode and a lower electrode of a liquid crystal element according to a fourth embodiment of the present invention.
FIG. 19 is a diagram illustrating voltages in a transparent electrode layer to which an upper connection terminal and a lower connection terminal of a liquid crystal element are connected according to a fourth embodiment of the present invention at five observation points.
FIG. 20 is a diagram showing the retardation state of the liquid crystal element in the fourth embodiment of the present invention at five observation points.
FIG. 21 is a diagram continuously showing a retardation state of a liquid crystal element in a fourth embodiment of the present invention in the vertical direction.
FIG. 22 is a diagram showing voltage waveforms applied to an upper electrode and a lower electrode of a liquid crystal element according to a fifth embodiment of the present invention.
FIG. 23 is a diagram illustrating voltage waveforms applied to an upper electrode, a lower electrode, and left and right electrodes of a liquid crystal element according to a sixth embodiment of the present invention.
FIG. 24 is a diagram showing a configuration of a stereoscopic image display system according to a seventh embodiment of the present invention.
FIG. 25 is a diagram showing a configuration of a field sequential color display system using a liquid crystal optical switch device according to Conventional Example 1.
FIG. 26 is a timing chart showing a control signal for driving a liquid crystal cell segment, a drive signal, a state of the cell segment, and a display state of the color display system.
FIG. 27 is a plan view of a liquid crystal element constituting a color display system.
FIG. 28 is a side sectional view of a liquid crystal element.
FIG. 29 is a diagram illustrating horizontal scanning of a raster of an image source.
FIG. 30 is a diagram illustrating vertical scanning of a raster of an image source.
FIG. 31 is a diagram showing a vertical screen position and a light emission state in consideration of vertical scanning of an image source and afterglow time of a phosphor screen.
32 is a diagram showing a vertical screen position and a light emission state when the liquid crystal element is controlled to be divided into upper and lower parts in Conventional Example 1. FIG.
FIG. 33 is a diagram showing a vertical screen position and a light emission state region when an image source of a color display system is enlarged in Conventional Example 1.
34 is a diagram showing a vertical screen position and a light emission state region when the number of divisions of the liquid crystal element is increased in Conventional Example 1. FIG.
FIG. 35 is a diagram showing a configuration of a color display system including a liquid crystal element using a ferroelectric liquid crystal material according to Conventional Example 2.
FIG. 36 is a diagram showing a vertical screen position and a light emission state when applied to a color display system in Conventional Example 2.
FIG. 37 is a diagram showing a vertical screen position and a light emitting state region in the case where the liquid crystal element is divided into two cell segments in Conventional Example 2.
[Explanation of symbols]
A38 image source, P12 liquid crystal element, A14 color selection filter, A16 colorless polarizing filter, P3, P4 transparent electrode layer, P7 liquid crystal material (liquid crystal layer), P1, P2 transparent substrate, P5L, P5R, P6T extraction electrode.

Claims (12)

A liquid crystal optical switch device disposed on the front surface of the scanning image output means and restricting light emitted from the scanning image output means,
Two opposing transparent electrode layers;
An extraction electrode provided on the upper end and lower end of one of the transparent electrode layers;
An extraction electrode provided at the left end and the right end of the other transparent electrode layer;
Applying different voltages to the extraction electrodes at the upper and lower ends of the transparent electrode layer, generating a vertical voltage tendency in the transparent electrode layer, connecting the extraction electrodes at the left end and the right end outside, Voltage applying means for setting the voltage in the transparent electrode layer to the same voltage in the left-right direction, and setting the voltage applied to the liquid crystal layer sandwiched between the two transparent electrode layers to different voltages in the vertical direction. Liquid crystal optical switch device. 2. The voltage application unit according to claim 1, wherein the voltage applied to the liquid crystal layer is changed in a vertical direction by changing a voltage applied to the extraction electrode at the upper end or the lower end. Liquid crystal optical switch device. The voltage application unit is configured to change the voltage applied to the extraction electrodes at the left end and the right end connected to the outside so that the voltage applied to the liquid crystal layer is different in the vertical direction. The liquid crystal optical switch device according to claim 1. The voltage applying means is applied to the liquid crystal layer by changing a voltage applied to the extraction electrode at the upper end portion or the lower end portion and changing a voltage applied to the extraction electrode at the left end portion and the right end portion connected externally. 2. The liquid crystal optical switch device according to claim 1, wherein the applied voltages are different in the vertical direction. The voltage applying means applies pulse voltages having different phases to the extraction electrodes at the upper end and the lower end, and is applied to the liquid crystal layer by a phase difference between the pulse voltage waveform of the upper end electrode and the pulse voltage waveform of the lower end electrode. 3. The liquid crystal optical switch device according to claim 2, wherein the voltage is a voltage having different temporal changes in the vertical direction. The voltage applying means applies a pulse voltage to the extraction electrode at the upper end, and applies a triangular wave voltage whose voltage changes with time to the extraction electrode at the lower end, so that the voltage applied to the liquid crystal layer varies in the vertical direction. 3. The liquid crystal optical switch device according to claim 2, wherein the voltage has a time change. The voltage applying means gives a pulse voltage to the extraction electrode at the upper end, and gives a triangular wave voltage whose voltage changes with time to the extraction electrode at the lower end with a phase difference from the pulse voltage waveform of the upper end electrode, 3. The liquid crystal optical switch device according to claim 2, wherein the voltage applied to the liquid crystal layer is a voltage having different temporal changes in the vertical direction. The voltage application means makes the voltage applied to the liquid crystal layer different in the vertical direction by applying a triangular wave voltage whose voltage changes with time to the left and right extraction electrodes connected externally. The liquid crystal optical switch device according to claim 3. There are two opposing transparent electrode layers, an extraction electrode provided at the upper end and the lower end of one of the transparent electrode layers, and an extraction electrode provided at the left end and the right end of the other transparent electrode layer. And a driving method of a liquid crystal optical switch device which is disposed in front of the scanning video output means and limits the light emitted from the scanning video output means,
Applying different voltages to the extraction electrodes at the upper end and the lower end, generating a vertical voltage tendency in the transparent electrode, connecting the extraction electrodes at the left end and the right end externally, A driving method characterized in that the voltage is the same voltage in the left-right direction, and the voltage applied to the liquid crystal layer sandwiched between the two transparent electrode layers is a different voltage in the vertical direction. The driving method according to claim 9, wherein a voltage applied to the liquid crystal layer is changed in a vertical direction by changing a voltage applied to the extraction electrode at the upper end portion or the lower end portion. 10. The drive according to claim 9, wherein the voltage applied to the liquid crystal layer is changed in the vertical direction by changing a voltage applied to the externally connected left and right extraction electrodes. Method. Scanning video output means for switching the right-eye image and the left-eye image in the first and second polarization states, respectively;
First liquid crystal optical switch means for limiting the outgoing light in the first deflection state from the scanning image output means;
Second liquid crystal optical switch means for limiting the outgoing light in the second deflection state from the scanning image output means;
Two opposing transparent electrode layers provided in the first and second liquid crystal optical switches;
An extraction electrode provided on the upper end and lower end of one of the transparent electrode layers;
An extraction electrode provided at the left end and the right end of the other transparent electrode layer;
Applying different voltages to the extraction electrodes at the upper and lower ends of the transparent electrode layer, generating a vertical voltage tendency in the transparent electrode layer, connecting the extraction electrodes at the left end and the right end outside, Voltage applying means for setting the voltage in the transparent electrode layer to the same voltage in the left-right direction, and setting the voltage applied to the liquid crystal layer sandwiched between the two transparent electrode layers to different voltages in the vertical direction. 3D image display device.

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