JPS5897983A - Projection type display - Google Patents

Abstract

PURPOSE:To obtain a light projected picture by imposing brightness modulation by a video signal through an optical system consisting of a polarizer and an analyzer, and a rotatory polarization part where plural of rotatory polarization control parts formed of electrooptic materials are arrayed linearly. CONSTITUTION:Light from a light source 1 is projected upon a rotatory polarization part 11 supported on a transparent supporting plate 10 through a rectangular opening plate 6, polarizer 7, semicylindrical lens 8, and mirror 9. The rotatory polarization part 11 is constituted by arraying plural of rotatory polarization control parts 19 formed of electrooptic materials on a circular transparent supporting plate 10. Those control parts 19 each have a pair of electrodes and terminal groups 21 and 22 for supplying a voltage to those electrodes. When luminous flux 20 having flat section in a thin beltlike shape passes through those control parts 19, the plane of polarization is rotated by a video signal input 18. The light modulated as mentioned above is projected on a screen by a projection lens 17, as brightness-modulated light by an analyzer 12, through scanning mirror 14. Thus, a bright picture is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a projection type display device for projecting an image onto a screen, and more specifically, the present invention relates to a projection type display device that projects an image onto a screen, and more particularly, the present invention relates to a projection type display device that projects an image onto a screen. A light modulation and line scanning means is a combination of a polarization plane same rotation means constituted by linearly arranged polarization planes, a polarizer and an analyzer, and a polarization plane rotation control of the light from the light modulation and line scanning means. The present invention proposes a novel projection type display apparatus comprising an optical deflection scanning means for deflection scanning in a direction perpendicular to the arrangement direction of the parts.

Several systems with different operating principles have been proposed as projection display devices that project optical images onto a screen based on electrical signals. ) to create an image corresponding to the electrical signal on the fluorescent surface. -1. The CRT projection type display system, which enlarges and projects the image onto a screen using a projection optical system, has not been widely put into practical use. There are some drawbacks such as difficulty in handling.1. It has only been realized for very limited purposes.

However, in the CRT projection type Tespnoy device, which is most suitable for general practical use, the image obtained on the CRT is projected onto the screen, so it is difficult to obtain a bright and high-resolution image on the screen. The disadvantage is that it is difficult to That is, in order to increase the brightness of the image projected on the screen, the brightness variation of the image on the CRT must be increased, and the fluorescent surface of the CRT must be scanned to increase the brightness of the image on the CRT. When the electron beam current is increased, the diameter of the electron beam on the fluorescent surface of the CRT increases, and the CR
This results in a decrease in the resolution of the image on T, and in the end,
It is difficult to simultaneously increase the brightness of the image on the CRT and improve the resolution IW, and as a result, it becomes difficult to obtain a high-brightness, high-resolution image on the screen.

Therefore, in the past, it has been difficult to obtain a projection display device that is relatively easy to configure and handle, is suitable for general practical use, and has excellent performance in terms of brightness and resolution of projected images. could not.

In view of the above disadvantages, the present invention provides a system that uses CRTt-free,
A polarizer and an analyzer are combined with a light source and a polarization plane rotation means formed by a plurality of polarization plane rotation controllers formed using an electro-optic material and arranged in a linear manner and controlled by a video signal. The main components are a light modulation and horizontal scanning means, and an optical vertical deflection scanning means for vertically deflecting and scanning the light from the light modulation and horizontal scanning means.
A projection type that effectively uses the light from the light source to form the entire projected image on the screen.It is relatively easy to configure and handle, and can also produce images with high brightness and excellent resolution. The present invention provides a display device. The following describes the implementation of the present invention with reference to the drawings. +1 will be explained.

g%/Figure A shows the projection type display game device according to the present invention.
R'7) - indicates a column; / is a light source, which has a light emitting part and a reflector 3; For example, a xenon arc lamp is used as the light emitting unit 2, and the reflector 3 preferably reflects visible light and allows heat rays to pass through.
A heat ray reflecting plate that reflects heat S and allows visible light to pass is arranged adjacent to it. Next to the heat ray reflecting plate l is the light source l.
There is a continuum/insta that converts the light from the beam into a parallel beam. Below, a rectangular aperture plate A'f is provided along the optical axis of the condenser lens 5 to polarize the light from the condenser lens 5 into polarized light having a predetermined plane of polarization. a semi-cylindrical V lens g that converts the polarized light from the beam into a light beam having a narrow strip-like flat cross section; a mirror 9 for changing the optical path;
A thin plate supported by a transparent support plate 10.

A polarization plane rotation unit that partially rotates the plane of polarization by a predetermined angle with respect to a light beam with a strip-like flat cross section; Analyzer that allows only the amount to pass through that corresponds to the rotation angle/2
, focusing lens/3, focusing lens/3f passed analyzer 1
A light deflection scanning section 16 including a movable mirror /G' and a mirror driving section 15, which deflects and scans the light from the light deflection scanning section 16, and a projection lens 17, which projects the light from the light deflection scanning section 16, are sequentially arranged. There is. 7g is the control circuit section, its input terminal 2
For example, a video signal is supplied to 7g', and the polarization plane rotation unit //f partially rotates the light beam having a narrow strip-like flat cross section.
The optical deflection scanning section /A'i (,
The deflection scanning operation is controlled to be performed in synchronization with the vertical period of the video signal.

Here, as shown in FIG. 1B, the polarization plane rotation unit 11 has a rectangular flat plate shape as a whole in a plane orthogonal to the optical axis, and is supported by a circular transparent support plate IO. Inside, a plurality of polarization plane rotation control units are arranged in a straight line to control this polarization.

The arrangement direction of the optical plane rotation control unit is a direction along the longitudinal direction of the flat cross section of the light beam having a narrow strip-shaped flat cross section, and the array part /9'iz of the 1st part in the polarization plane rotation side, the narrow strip-shaped flat cross section It is arranged at a position such that a light beam 2θ having a value of 2θ passes therethrough. Each polarization plane rotation control unit has a pair of electrodes,
Terminal group 2/ and 22 for supplying voltage to these electrodes
are derived and connected to the control circuit section /g, respectively.

The polarization plane rotation unit // is configured as shown in detail in FIGS. 2 and 3, for example. Figure 2 is a plan view.
FIG. 3 is a cross-sectional view taken along the line ■-■ in FIG. year,
An antireflection film 2 is coated on one surface of the electro-optic material plate 23. Further, on the other surface of the electro-optic material plate 23, a low dielectric constant insulating film 2s made of silicon oxide or the like is deposited with a predetermined gap 26 formed thereon, and a plurality of electrodes Ei= In the gap between Ey and 'ttWiF t=Fu, insulation +1 and 2 q, these electrodes E'/- are arranged in such a way that their corresponding ends are opposed to each other. FM and 'Rupole Ft ~ FM
The opposing ends of the electrodes F/-FM are in direct contact with the surface of the electro-optic material plate 23, and the electrodes F/-FM are commonly connected, and a voltage supply terminal (not shown) is led out from the common connection electrode. In this case, the distance t between each of the electrodes E/-EM and each of the electrodes F/%FM is, for example, ! rO~1100ti, and the respective widths W of the electrode ElS-EM and the electrode Ft=FM and the distance U between the opposing ends of the electrode E/~EM and the electrode F/-FM are fl)IJ, for example, 20 -It is considered as taoltm. An antireflection film 27 is deposited on the gap 26 between the insulating film 2 and the opposing portions of the electrodes E/-EM and F/-FM. Electrode E t = E M
An insulating film 2g having a low dielectric constant is deposited on the upper end of the metal layer opposite to the end facing each electrode F/""'FM, and on top of that, the electrode E/"EM A plurality of electrodes G/, ~GM are arranged in an array extending in a direction perpendicular to .One end of each of these electrodes Gi=Gy is connected to the end rl of the electrode E/-EM to which the insulating film 2g is not attached. -rM, electrode E
/%EH, and a voltage supply terminal (not shown) is led out from the other end. , and the above-mentioned electric IF
jg E t −E'yt pair and electric 'f@Ft=FM
N (N=positive integer) sets are formed in a repeating arrangement to form a total of M'XN=X electrodes Et=Ey and opposing parts of the electrodes F/-FM. Therefore, electrode F
N common connection electrodes with t=Fy and D t =D N are formed. .

In the polarization plane rotation section configured in this way, the electric current
Since a total of N polarization plane rotation control parts P/-PX are formed between the opposing ends of ffi, Ey~EM and electric WIF/~FM, the electrode Gt=GM and the common connection electrode D N pairs of electrodes E/~EM and N pairs of electrodes F, -FM, corresponding to each other via /~DN (total of X pairs)
When a predetermined voltage is selectively applied to generate an electric field between the opposing ends, a voltage is applied to a selected one of the polarization plane rotation control parts P and -px to form the An electric field is applied to the part of the electric material plate 23 that
In this part, the value of the applied voltage due to the electro-optic effect,
That is, a polarization plane rotation effect is generated according to the strength of the applied electric field, and the polarization plane of the light passing through the selected polarization plane rotation control unit is rotated by an angle corresponding to the applied voltage. become.

Note that the polarization plane rotation control unit pl-px formed using an electro-optic material plate has a memory function in the polarization plane rotation action, and can be placed in a potential open state (floating state) by removing the applied voltage. However, the conventional polarization plane rotation effect continues. The light passing through the polarization plane rotation control unit P/-px passes through the electro-optic material plate 23 in the direction from the anti-reflection film 2q side to the anti-reflection film core side, or in the opposite direction.

In addition, as shown in FIG. Then, a polarization plane rotation control section Pt-Pxf is formed, and a counter electrode E, / is also formed on the other side of the common connection electrode DN.
~EM' and Fl'~Fy''e arrays can also be formed to form polarization plane rotation control units Pl'~Px'e. In this case, two rows of polarization plane rotation control units can be formed in parallel. The polarization plane rotation unit /'/ which is configured as described above and which causes polarization plane rotation will be arranged such that when a voltage is applied to each of its polarization plane rotation control units -Pl to Px, The plane of polarization of the passing light is rotated by an angle corresponding to the applied voltage value.The plane of polarization rotation control unit P t is arranged linearly.
= P X is supplied with a voltage corresponding to the signal content in each horizontal period of the input video signal from the control circuit section /g, from one end of the input video signal, for example, from P/ to the other end. Once received, it is sequentially supplied to PX with l horizontal period,
Ball supply is repeated in horizontal cycles during this period.

The polarization plane of the light that has passed through the polarizer 7 and the polarization plane of the light that can pass through the analyzer 12 with the maximum amount are set to be perpendicular to each other. The polarization plane given by 7 allows the light that has been rotated by the polarization plane rotation control units p and -Px of the polarization plane rotation unit // to pass through only the acid corresponding to the rotation angle. This results in
The light obtained from the analyzer 12 is luminance-modulated by the video signal input to the control circuit section /g.

Furthermore, the optical deflection scanning section/A reflects the light from the analyzer 12 with a movable mirror/U to perform deflection scanning.
A control signal synchronized with the vertical period of one video signal is supplied from the control circuit unit /g to the mirror drive unit /& that drives the movable mirror 11, and the movable mirror /F converts the light from the analyzer 12 into In synchronization with the vertical period of the video signal, the polarization plane rotation unit i
The polarization plane rotation control unit P t '' of i is driven to perform polarization scanning in a direction perpendicular to the arrangement direction of P X.

In such an example, the light from the light source 1 passes through the heat ray reflecting plate V to remove heat rays, and then is converted into a parallel beam by the condenser lens 5 and enters the polarizer 7, and is directed to a predetermined angular position,
That is, the light from the polarizer 7 is considered to be polarized light having a plane of polarization at an angle θ. The light beam is focused to become a light beam, and passes through the polarization plane rotation control parts P/~Pxk arranged along the longitudinal direction of the narrow strip-shaped flat cross section of the polarization plane rotation part //. The direction of the optical path is changed by the mirror. 1 piece optical surface rotation control part P
/-P Since the polarization plane of the light is rotated by an angle α corresponding to the applied voltage value, the polarization plane rotation control unit Pt=Pxk
The polarization plane of the part of the light beam having a narrow strip-like flat cross section that passes through the polarization plane rotation control unit P/~Px to which a voltage is applied is rotated by an angle α, and is rotated by an angle θ±α. The light has a polarized plane, and the part of the light having the polarized plane at an angle θ±α is converted into a light beam with a narrow strip-like flat cross section as a voltage is applied to the polarization plane rotation control unit pl-px. It moves linearly repeatedly within the flat cross section. In this case, each of the polarization plane rotation control units P/ to PX has a memory function in the polarization plane rotation action, so once a voltage is applied,
Next, even if the application of %tBE is stopped and the floating state is applied, the next new voltage is applied after l horizontal period, and the voltage that was applied before the floating state is quickly restored. The polarization plane continues to rotate, and the light passing through it is in a floating state, that is, the horizontal period angle θ
It is assumed that the light has a polarization plane of ±α. Then, the light beam having a narrow strip-shaped flat cross section that has passed through the polarization plane rotation section // is incident on the analyzer 12 . The analyzer 12 transmits the maximum amount of light having a polarization plane at an angle perpendicular to the angle θ, that is, the angle θ±qo degrees, in other words, the light whose rotation angle of the polarization plane is 90 degrees. For light whose rotation angle α is 90 degrees or less, the amount of transmitted light is reduced as the angle α becomes smaller than 90 degrees. A portion of the polarization plane rotated by an angle α by the rotation control unit P/-px passes through the analyzer /2ijH by only a light beam corresponding to the angle α. The portion of the light having the plane of polarization at the angle θ±α moves linearly within the flat cross section of the light beam having a narrow band-like flat cross section, so the output side of the analyzer 12 receives the video signal. The brightness is modulated according to the signal content in each horizontal period, and light that moves linearly during one water period of the video signal, that is, horizontally scanned light, is repeatedly obtained.

Here, the area and interval of each of the polarization plane rotation control units pl-px are extremely small, and the polarization plane rotation control units P/~
The plane of polarization is rotated by Px, and the light passing through the analyzer/2f becomes a focused light, either as it is or through a focusing lens. An array of focused beams that is brightly modulated accordingly and horizontally scanned is obtained.

Each focused beam maintains the same state for a period of time due to the memory action of the polarization plane rotation controllers p and -px.

In the above example, the light from the light source 1 is focused by the semicylindrical nozzle g after passing through the polarizer 7, but before passing through the polarizer 7, the light from the light source l is focused by the semicylindrical V lens. You may be allowed to receive it.

The light obtained on the output side of the analyzer 12 as described above is
The light from the analyzer 12 is focused by the focusing lens 13 and incident on the optical deflection scanning section 16. Polarization scanning is performed in a direction perpendicular to the arrangement direction of the polarization plane rotation control units pt-px of the polarization plane rotation unit //. That is, an optical system composed of a combination of a polarization plane rotation unit //, a polarizer, and an analyzer 12 causes the focused light to be brightly modulated according to the video signal and to be horizontally scanned, and to be vertically scanned. be. Then, the light from the optical deflection scanning section 16 is projected by the projection lens 17, and an optical image corresponding to the video signal supplied to the control circuit section 1g is projected and displayed on a predetermined screen, for example.

Further, when the video signal supplied to the control circuit section /g is a color video signal and a color image is to be displayed on a projection display, the mirror 9 and one polarization plane rotating section /g shown in FIG. '/, for example, V dichroic mirrors 9, 30, 3/ and 32. configured as shown in FIG. Total reflection mirror, 33 and 3'
1, three polarization plane rotation units //R, //f3 and //Q are used. Here, dichroic mirror 29 is supposed to reflect red light and blue light, dichroic mirrors 30 and 31 are supposed to reflect only blue light, and dichroic mirror 32 is supposed to reflect only red light. 1, and three polarization plane rotation parts//R,
//f3 and //Q are the above-mentioned polarization plane concurrence 141, respectively.
Curse t t and gold〈Similar, the control circuit section /g uses red (R), blue (B) and green (
The voltage V R+ corresponding to each of the three primary color signal components of G)
VB and vG are applied to the polarization plane rotation control units Pt to PX of the polarization plane rotation units //R, //B, and //R, respectively.

In this case, the red light and the blue light of the light focused by the Kamapoko-shaped V lens g are reflected by the dichroic mirror 2q, and the red light of the light is further transmitted through the dichroic mirror 30f to the polarization plane rotation unit/ /R passes through the polarization plane rotation control unit Pt-Pxk. At this time, the red light undergoes rotation control of the polarization plane as described above according to the red primary color signal component in the color video signal, and then the total reflection mirror 31
and is reflected by the dichroic mirror 32 and extracted. Further, the blue light reflected by the dichroic mirror 29 is reflected by the dichroic mirror 30 and passes through the polarization plane rotation control units p, -Px of the polarization plane rotation unit ttB. At this time, the blue light undergoes rotational control of the plane of polarization according to the back primary color signal component in the color video signal, and is then reflected by the dichroic mirror 31, transmitted through the dichroic mirror 32, and extracted. . Furthermore, the green light of the light focused by the semicircular lens g passes through the dichroic mirror 29, is reflected by the total reflection mirror 33, and is reflected by the polarization plane rotation control section Pl'' of the polarization plane rotation section llG.
P) (, t-passes 4, at this time, the green light undergoes polarization plane rotation control according to the green primary color signal component in the color video signal, and then passes through the dichroic mirrors 31 and 3.
2 mm. Therefore, the dichroic mirror 32 generates a mixture of red light, blue light, and green light, each of which has been individually rotated in its polarization plane according to each of the red, blue, and green primary color signal components in the input color video signal. You can get light. This mixed light is incident on the analyzer 12 and analyzed 'F-/
At the output side of 2, composite light of red light, blue light, and green light is modulated in brightness according to the red, blue, and green primary color signal components in the color video signal, and is horizontally scanned in the same direction. is obtained, which is vertically scanned by the light deflection scanning unit /6 and projected by the projection lens t7, so that a color image is obtained on the screen as a color video signal.1°Next, the polarization plane rotation unit // Polarization plane rotation control unit Pl to PX
The voltage application to will be explained using an example where a color image is projected and displayed. FIG. 6 shows a control circuit unit for applying voltage to the polarization plane rotation unit //R and its polarization plane rotation control units Pt to Px for red light in such a case.
In the polarization plane rotation unit //H, which shows an example of g, there are N pairs of opposing M electrodes E/~EM and M electrodes F/-FM.
A pair arrangement is formed, each pair of electrodes E/-EM and electrodes F/
-, -)i' A total of MXN=X polarization plane rotation control units p, -Px are formed between the opposite end portions to M.

In addition, M electrodes G/-GM are formed perpendicular to each set of electrodes Et=EM, respectively connected to the electrodes Et=EM, and further,
N common connection electrodes D/%DN are formed to commonly connect each set of electrodes Fl-FM'r. , M, N, and X are specifically, for example, M=/A, N, ,=32, and therefore,
The polarization plane rotation control units P/ to PS/2 are arranged in a straight line.

The electrodes Gt''GM are respectively connected to terminals g/~gM, and these terminals g/~gM are selectively supplied with a predetermined voltage to the electrodes E/~EM through electrodes Gl~GM'. The voltage supply circuits Ct=CM are connected to each other.The common connection electrodes -DN are connected to the terminals d and -dN, respectively.
These terminals d, ~dN have a common connection electrode Dl-I)
Electrode F/ through Ne. Switch circuits 5l to 8N are connected to selectively ground each of the terminals .about.Fy. These voltage supply circuit Ct=Cyt and switch circuit S/-8N constitute a part of the control circuit section /g, and the switch circuit 5
Common connection electrode D/~DN by either l-8N
When the electrodes Ft to FM connected to any one of the electrodes Ft to FM are grounded, the electrodes E t − corresponding to the grounded electrodes F to FM are connected by any of the voltage supply circuits C to CM.
By supplying a predetermined voltage to one of Ey, a voltage is applied to one of the polarization plane rotation control units Pt=Px, and the applied voltage 1 of the polarization plane of the light passing there 1. In this example, the voltage supply circuit Ct=CM and the switch circuit S/-8N rotate the polarization plane rotation control unit P at a time of l horizontal period (/H). A voltage corresponding to a change in the red primary color signal component within each horizontal period is sequentially applied to all of Px, and the voltage is repeatedly applied.

The voltage supply circuit C/ is an MO8 type field effect transistor (hereinafter referred to as MOS-FET) T t + T
2 and T3'. And MOS @
FET T1 and T3 are turned on and off at the same time, and when they are turned on, the red primary color signal component SR' of the color video signal, which will be described later, is supplied to the gate of MOS FET T2 via MOS FET T1, and the red primary color signal component SR' of the color video signal is supplied to the source. A voltage corresponding to the red primary color signal component SR' is obtained, and this voltage is supplied to the electrode G/ connected to the output terminal of the MOS-FETT T3' (i-).
When TT/ and T3 are turned off, the voltage supply to electrode G/ is cut off. The voltage supply circuits 02 to CM are also configured in the same manner as the voltage supply circuit C/, and the corresponding electrodes 02 to CM are configured similarly to the voltage supply circuit C/.
~A voltage corresponding to the red primary color signal component SR' is supplied to the GM, and the voltage supply is cut off.

On the other hand, the switch circuit Sl is constituted by a MOS-FET T. When MO8φF'ETT is turned on, the common connection electrode D connected to its output terminal
When / is grounded and MOS-FET Tl is turned off,
The common connection electrode Dtt is not grounded. The switch circuits 82 to SN are also configured in the same manner as the switch circuit S/, and the corresponding common connection electrodes D2 to DN are grounded or not grounded. 1 and
The voltage supply circuit Ct=Cyt has each control input terminal a
/ % a Its operation is controlled by the control signal supplied from M and the red primary color signal component SR' supplied from the signal input terminals V/~vM, and the switch circuit S/k
The operation of sN is controlled by control signals supplied from the respective control input terminals b/~bN, and below, the control signals are applied to the voltage supply amount, the circuit C/-CM, and the switch circuit S/~SN. Furthermore, the voltage supply circuit Ct=Cyi
In this section, the circuit portion that supplies the red primary color signal component SR''k will be described.

The color video signal supplied from the input terminal lza' is supplied to the subsequent color demodulation circuit 36 through the amplifier circuit 35, and the red, blue, and green primary color signal components SR,
SB and SG are obtained. , these primary color signal components SR
, SB and SG are supplied to a gamma correction circuit 37, which outputs gamma-corrected red, blue and green primary color signal components SR'.

SB' and SG' are obtained7, and this gamma correction is
Voltage V applied to each of polarization plane rotation control units P/ to PX
The relationship between , and the amount of light I obtained at the output side of the analyzer is not a linear characteristic, but a curved characteristic as shown in Figure 7. The gamma-corrected red primary color signal component SR' is supplied to each signal input terminal V/- of the voltage supply circuit Ct=CM.
VM is supplied. In addition, the gamma-corrected blue primary color signal component SB' and green primary color signal component SG' are also generated by the respective polarization plane rotation units 1tB and //G for blue light and green light, which are not shown. The voltage is supplied to each signal terminal of a voltage supply circuit for applying a voltage to the polarization plane rotation control section.

The color video signal from the amplifier circuit 3S is also supplied to the horizontal synchronization separation circuit 3g, and a horizontal synchronization signal is obtained at its output terminal, which is waveform-shaped by the waveform shaping circuit 39, as shown in Figure A. A pulse ph with a horizontal period as shown is obtained. Let fh be the frequency of this pulse ph, that is, the horizontal frequency.

The pulse ph is supplied to a pulse frequency multiplier circuit po, and the pulse frequency multiplier circuit VO generates a pulse pne having a frequency NXfh that is N times fh as shown in FIG. The pulse pn is further supplied to a pulse number multiplier <(/), and the pulse number multiplier g/ has a frequency f p = M MXN times fh, as shown in Figure C.
Noculus Pmff1 of X N X f h is generated.

, pulse T)m is supplied to an M-bit ring counter p2, and the ring counter 12 rises at the rising edge of one pulse pm and falls at the rising edge of the next pulse qt.
-q M'fr:,''/ M
This is generated at the output terminal of 1 and is repeated. The signals obtained at these M output terminals q/~qM are each supplied to one input terminal of the AND circuit A/-AM, and the other input terminal of each of the AND circuits A/~AM is The pulse pm from the .(Russ frequency multiplier Z/) is supplied to the .
Pulse Q/-, which is the AND output of qM and pulse I)m, is generated every M pulses pm and whose phase shifts sequentially.
3, these values Q/-QM are supplied as control signals to the control input terminals a7-aM of the voltage supply circuit C/-CM, respectively.Voltage supply circuit C/~Cyt
When pulse Q/-QM, which is a control signal, is supplied, MOS-FET Tl and T3 are turned on,
The signal content in each horizontal period of the red primary color signal component SR' supplied to the signal input terminal V7-VM to the corresponding electrode Gt=GM of the polarization plane rotation unit t(R) connected to each output terminal. When the pulse Qt=QM is not supplied, MO8@FET Tl is turned off and the voltage supply to the corresponding electrode G/-GM is stopped.Thereby, the polarization plane rotation unit/ /R voltage ff1Et A voltage according to the signal content in each horizontal period is applied, and the other periods are in a floating state.The repetition frequency of voltage application at one of the electrodes E t = E M is ``=NXfh becomes.

Further, the pulse pn is supplied to an N-bit ring counter 3, which receives a pulse Rt which rises at the rising edge of one pulse Pn and falls at the rising edge of the next one, as shown in FIG. = RN is generated sequentially at N output terminals every time a pulse pn arrives within the f water period (/H), and this is repeated. The pulses R/-RN obtained at these N output terminals are respectively supplied as control signals to the control input terminals S, -bN of the switch circuits S/-SN. When pulses R/~RN, which are control signals, are supplied, MO8
When the Tatami FET T u is turned on, the corresponding common connection electrode D of the polarization plane rotation unit //R connected to each output.
/~DN is grounded, and when pulse R/~RN is not supplied, IViO8φFETT is turned off and the corresponding common connection electrode D/~DNk is not grounded. As a result, the common connection electrode D t ” of the polarization plane rotation part //R
The N sets of electrodes F/ to FM connected to each of the terminals DN are not grounded during the period D of the pulse Rt-RN. From the above, the repetition frequency of grounding in one of the pairs of %C poles F/~Fy is determined by the electrode E of the polarization plane rotation part//R.
A voltage corresponding to the red primary color signal component SR' is applied to one of the EEMs, and the electrode facing it rotates around once every 1 horizontal period. That is, the primary color signal component S of the polarization plane rotation control unit Pt-Pz
A voltage corresponding to the signal content within the t water period of R' is applied, one time of this sequential voltage application is completed in l horizontal period, and this is repeated.

The color video signal from the amplifier circuit 35 is 1. Furthermore, it is also supplied to a vertical synchronization separation circuit up, and a vertical synchronization signal is obtained at its output end. This vertical synchronizing signal is supplied to a frequency divider rts, and a frame period pulse is obtained at its output terminal, which is supplied to one input terminal of the AND circuit 6. A pulse ph with a horizontal period is supplied to the other input end of the AND circuit 16, and a pulse with a frame period synchronized with the pulse ph is obtained at the output end of the AND circuit v6. It is supplied to the N-bit ring counter 13 as a set 0 pulse. .

Furthermore, the vertical synchronization signal from the vertical synchronization separation circuit pu is
The signal is supplied to the vertical deflection scanning control circuit 17, and the vertical deflection scanning control circuit 1@S7 uses the vertical synchronization signal to cause the movable mirror /V of the optical deflection scanning section 16 to perform vertical scanning with respect to the incident light. A control signal is generated and supplied to the mirror drive section 15 of the optical deflection scanning section Mero.

Although not shown in FIG. 6, the polarization plane rotation section //13 for blue light and the polarization plane rotation section //G for green light are also demodulated from the color video signal in the same manner as described above. A voltage corresponding to the gamma-corrected blue primary color signal component SB' and green primary color signal component SG' is supplied.

As explained above, the projection type tape/eye device according to the present invention utilizes light from a light source to generate a polarized light plane formed by linearly arranging a plurality of polarization plane rotation control units formed using an electro-optic material. An optical system that combines a rotating part, a polarizer, and an analyzer performs brightness modulation according to the video signal, and
By obtaining horizontally scanned light, vertically scanning it, and projecting it to obtain a projected image on a screen, it is possible to efficiently modulate the brightness of the light according to the video signal, and also to rotate the plane of polarization. Since the utilization rate of the light from the light source is extremely high due to the memory function of the control section, a clear and visually very bright projection surface 1# can be obtained on the screen.

In addition, by adjusting the brightness of the light source or selecting an optical system such as a lens, the brightness of the projected image can be adjusted without changing the diameter of the focal light that forms the unit pixel of the projected image or the shape of the spot on the screen. So, with high brightness and
A high-resolution projected image can be obtained. The diameter of this focal light and the spot shape on the screen can be defined by the dimensions and shape of the polarization plane rotation control unit, and therefore, the unit pixels can be made uniform over the entire projected image, so this point is important. The resolution will also be improved. Furthermore, the projection type display device according to the present invention has a simpler overall structure than conventional devices, can be easily configured, and can be easily handled1, and is extremely practical. There is.

Note that the present invention is not limited to the range of the above-mentioned embodiments, and may be modified in various ways without departing from the scope of the invention, such as having each component such as the polarization plane (b) inversion part have a different structure. Of course, it is possible to take the form of 1゜

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing a row of projection type display devices according to the present invention, and FIG. 2 is a configuration diagram showing a row of projection type display devices according to the present invention.
FIG. 3 is a partial plan view showing details of an example of the polarization plane rotation unit used in the device; FIG. FIG. 6 is a block diagram showing the main parts of another example of a projection type Tesbnoy device including a polarization plane rotation unit used in a display device. FIG. A connection diagram showing details of the control circuit section ρ1j for this,
7 and g are characteristic diagrams and waveform diagrams used to explain the operation of the control circuit section shown in FIG. 6. In the figure, l is the light source, g is the heat reflector, and evening is the condenser/V.
7 is a polarizer, g is a semicylindrical lens, 9, 33 and 31 are mirrors, //, //R. //B and //Q are polarization plane rotation parts, 12 is an analyzer, 13
is a focusing lens, /A is a light deflection scanning unit, /7 is a projection lens, 1g is a control circuit unit, 23 is an electro-optic material plate, 25 and 2g are insulating films, 29.30. . 31 and 32 are dichroic mirrors, 36 is a color demodulation circuit, 37 is a gamma correction circuit, 3g is a horizontal synchronization separation circuit, ttto and p/ are pulse frequency multiplication circuits, 12 and 13 are ring counters, p<z is vertical synchronous separation circuit,
E t=Ey + F /-FM and G/%GM are electrodes, D/-DN are common connection electrodes, P, -px are polarization plane rotation control units, Ct -, CM are voltage supply circuits, S/-3N is a switch circuit, and A/~AM is an AND circuit. -Hmm-

Claims (1)

[Claims] a light source, a polarizer that makes the light from the light source into polarized light having a plane of polarization at a predetermined angular position; an optical member formed of an electro-optic material on the path of the light from the light source L, which is polarized light having all the polarization planes at the predetermined angular position and has a flat cross section; a polarization plane rotation means configured such that a plurality of polarization plane rotation control units are arranged linearly in a direction along the longitudinal direction of the flat cross section of the light beam; and each of the plurality of polarization plane rotation control units , for corresponding parts of the luminous flux of the flat cross section, sequentially,
a control means for controlling the rotation of the polarization plane by an angle corresponding to an input signal; an analyzer for allowing the multi-likelihood light to pass; and a plurality of polarization plane rotation control units for controlling the light from the analyzer. and an optical deflection scanning means for deflecting and scanning in a direction substantially perpendicular to the arrangement direction of the projection display device, the projection type display device is configured to project an optical image onto the entire screen according to the input signal.