JPS6113885A - Projecting type picture image display device - Google Patents

Abstract

PURPOSE:To obtain a display device constituted comparatively easily, with ease of handling and high brightness and high resolution by making a light from a light source incident on a liquid crystal display via a polarized beam splitter, projecting its reflected light onto a screen via the beam splitter and a projecting lens and displaying a magnified picture. CONSTITUTION:When a color light lSR is incident on a light crystal device 1R, a polarized light whose polarized plane is rotated at each picture element electrode in response to a picture element signal of a red primary color signal SR is obtained as a reflected light, it is fed again to the beam splitter 16, only the P component polarized light produced by the turning of the polarized plane goes straight and is fed to a zoom projecting lens 25. The remaining S component polarized light is reflected and returns to an xenon lamp 20. This is also applied to color lights lSG and lSB incident to liquid crystal devices 1G, 1B. An image light subject to contrast modulation at each picture element is fed to the zoom lens 25 and a magnified color picture is displayed on the screen 26.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a projection type image display device, and particularly to one using a reflective liquid crystal device.

BACKGROUND ART AND PROBLEMS Various projection-type image display devices have been proposed that project an image based on a video signal onto a screen to obtain an enlarged image. For example, a cathode ray tube (CRT) with a phosphor screen
The CRT type, which uses a phosphor screen to obtain an image corresponding to the video signal on the phosphor screen and enlarges and projects this image onto the screen using a projection optical system, is widely used in practical use, and other types have different configurations. However, it has disadvantages such as being large-scale and difficult to handle, so it has only been put into practical use for extremely limited purposes.

By the way, in the case of the CRT type, which is most suitable for this general practical use, the image obtained on the CRT is projected onto the screen, so it is possible to obtain a high brightness and high resolution image on the screen. The drawback is that it has limitations. That is, in order to increase the brightness of the image projected on the screen, the brightness of the image on the CRT must be increased.
Increase the brightness of the image on the CRT (increasing the electron beam current that scans the CRT's phosphor screen will increase the diameter of the electron beam on the CRT's phosphor screen, causing a decrease in the resolution of the image on the CRT). As a result, it is difficult to simultaneously increase the brightness and improve the resolution of the image on the CRT, and as a result, it becomes difficult to obtain a high-brightness, high-resolution image on the screen.

OBJECTS OF THE INVENTION In view of these points, the present invention is designed to be relatively easy to construct and handle, and to provide high brightness and high resolution.

It includes a light beam splitter, a reflective liquid crystal device that rotates the plane of polarization for each pixel based on a video signal, and a projection lens. Light from a light source enters the liquid crystal device via the polarizing beam splitter, and the The reflected light from the liquid crystal device is projected onto a screen via a beam splitter and a projection lens, and an enlarged image is displayed on this screen. Therefore, according to the present invention, it is relatively easy to configure and handle, and moreover, the light from the light source is effectively used, so that a high-brightness, high-resolution image can be displayed.

EXAMPLE Hereinafter, referring to FIG. 1, one embodiment of the present invention is shown in the same figure, (IR), (IG) and (IB) are respectively red,
This is a reflective liquid crystal device that rotates the plane of polarization for each pixel based on green and blue primary color signals SR, SQ, and sB.

In the case of the example shown in FIG. 1, each of the primary color signals sR to sB has 525 scanning lines and is of a 2:1 interlaced type.FIG. 2 shows, for example, a liquid crystal device (IR). In this case, there are 512 pieces in the horizontal direction X and 51 pieces in the vertical direction y.
Two pixels are considered. That is, a transparent electrode (common electrode) eE is formed on the - metal surface with a liquid crystal (not shown) in between, and 512 x 512 pixel electrodes eE are formed on the other surface.
u, 1), e(1, 2), -=・, e(512,
511) and e(512, 512) are formed in a matrix. Then, the pixel electrodes e(l, 1) to e(s
xz, 512) is formed by vapor-depositing aluminum, for example, and serves also as a reflecting mirror. Note that as the liquid crystal, for example, an electric field controlled birefringence effect (ECB) liquid crystal is used. In this case, the polarized light incident through the transparent electrode eE is reflected by the pixel electrodes e(1,1) to e(512, 512) and exits through the transparent 11'1MeE. At this time, the polarized light emitted from the transparent electrode eE is
The plane of polarization is rotated according to the magnitude of the signal applied to (1, 1) to e (512, 512).

In addition, in FIG. 2, T(1,1) to T(512,51
2) is the pixel electrode e(l, 1) e(512,512)
This is an MO8 type field effect transistor (hereinafter referred to as FET) that constitutes a switching element provided in correspondence with K and Te1 and I and Vc. These FETs T(1,1)
~T(512,5xz) source is pixel electrode e(1,B
~e (sxz, 512) K husband kM continues (in the figure
(See “x” mark). Although not shown, each pixel electrode e(l, g
~e(slz, 512) &l! , as shown in Figure 3.5
iCs is connected to compensate for the discharge of charge from the liquid crystal capacitor Co via, for example, the liquid crystal resistor Ro, and is effective as a driving power source for the liquid crystal element.
% drive is possible.

Further, (2A) is a 512-stage horizontal shift register, and a clock signal CLK (fourth
At the same time, a start signal SA (shown in FIG. 4H) is supplied from the terminal (2A2). In addition, (3A) is a sample hold circuit, and the terminal (3A
1) supplies a red primary color signal SR (shown in FIG. 4F), and sample signals are supplied from two shift registers, so that 512 pixel signals for one horizontal period are sampled and held. Also, this sample and hold circuit (
3A) 512 output terminals are FETTAI~TA5
12 drains. These FETTA
A gate signal GA (shown in FIG. 4J) is supplied from a terminal (4A) to the gates of I to TAI 512.

Further, (2B) is a 512-stage horizontal shift register, to which a clock signal CLK is supplied from a terminal (2Bt) and a start signal SB (shown in Figure 4) is supplied from a terminal (2B2). Further, (3B) is a sample and hold circuit, to which the red primary color signal sB is supplied from the terminal (3B1) and the sample signal is supplied from the shift register (2B), and 512 pixel signals for one horizontal period are The sample is held. The 512 output terminals of the sample and hold circuit (3B) are FET
It is connected to the respective drains of TBI to TB12. The gates of these FETs TB, ~TB512 are connected to the gate signal GB (shown in Figure 4K) from the terminal (4B).
is supplied.

Also, the sources of FETTAL and TBI are FET T
(1,1), T(2,1), °°°゛0, T(512,
1) connected to the drain of 1FET TA2 and TB2
The sources are FET T(1,2), T(2,2),...
...-1T (512, 2), and the following connections are made in the same manner.

Further, (5A) is a vertical shift register having 256 stages, and a pulse M number P,n (shown in the fourth diagram) having a frequency of fH is supplied from a terminal (5Al) as a clock signal. 5A2) to start signal S. (shown in FIG. 4B) is supplied. The output terminals of each of the 256 stages of this vertical shift register (5A) are:
Each FET T (1, 1) ~ T (1,512) s T
(a, 1) ~ T(3,112)・°°゛°°”, T(
511,1)ゞConnected to the gate of T(511,512).

Further, (5B) is a vertical shift register having 256 stages, to which a clock signal PR is supplied from a terminal (5B1) as a clock signal, and a start signal SE (as shown in FIG. 4C) is supplied from a terminal (5B2). ) is supplied.

The output terminals of each of the 256 stages of this vertical shift register (5B) are FETT(2,t) to T(2,512), respectively.
, 'r(4,1)~T(4p512), "-1"', connected to the gates of T(512,1)~T(512,512).

In addition, start pulse S. t SES clock signal CLK
etc., are formed by a circuit as shown in FIG. 5, for example. In the same figure, the vertical synchronous feed is supplied to the terminal (6),
A start signal S is applied to its non-inverting and inverting output terminals Q and Q, respectively. and S= are obtained. Further, the horizontal synchronizing signal PH (frequency fn) supplied to the terminal (9) is the AFC circuit Q (
A more stable pulse signal PH can be obtained. This pulse signal pH is multiplied by 512 by a multiplier αυ, and a clock signal CLK is obtained on its output side. Also,
The pulse signal pH from the AFC circuit α0) is supplied as a trigger signal to the T7 lip-flop circuit (121), and the signal 5A (G
B) and 5B(GA) are obtained.

Also, the vertical synchronization signal Pv passed through the waveform shaping circuit (7)
The pulse signal PH from the AFC circuit a is supplied to the field discrimination circuit α9, and a discrimination signal SI (shown in FIG. 4E) is obtained at its output side. Then, this discrimination signal Sl
are flip-flop circuits (8), (13, multiplier 01)
are supplied as timing control signals to each signal, and the timing of each signal is controlled as shown in FIG.

Further, as shown in FIG. 6, the red primary color signal SR is supplied via a γ correction amplifier α and a signal processing circuit α9 for processing suitable for driving the liquid crystal.

The liquid crystal device (IR) is configured as described above, and in odd fields, a start signal S is sent. reaches a high level, so the vertical shift register (5A) operates.

In the first horizontal period, the start signal SA is at level 1, so the horizontal shift registers (2) operate, and the sample and hold circuit (3A) samples and holds the 512 pixel signals in the first horizontal period. be done.

In the second horizontal period following the first horizontal period, the gate signal GA is at a high level, so FETTAI~TA51
2 is turned on. During this period, the output of the first stage of the vertical shift register (5 people) becomes the
T(1,1) to T(1,512) are turned on. Therefore, during this period, 512 pixel signals in the first horizontal period are applied to the pixel electrodes e(1,1) to e(1,512) from the sample and hold circuit (3A), and the liquid crystal capacitance CO
1 auxiliary capacity cB. Also, in this second horizontal period, the start signal sB is at the noi level, so
The horizontal shift register (2B) operates, and the sample and hold circuit (3B) samples and holds 512 pixel signals in the second horizontal period.

In the third horizontal period following the second horizontal period, the gate signal GB is at a high level, so that the FETs TB, ~TB51
2 is turned on. During this period, the output of the second stage of the vertical shift register (5A) becomes high level, and the FET
T(3,1) to T(3,512) are turned on. Therefore, during this period, 512 pixel signals in the second horizontal period are applied to the pixel electrodes e(3,1) to e(3,512) from the sample and hold circuit (3B), and the liquid crystal capacitance Co is applied to each pixel electrode e(3,1) to e(3,512).

The attached capacity C8K is maintained. In addition, in this third horizontal period, the start signal SA becomes a zero level, so the horizontal shift registers (two) operate, and the sample hold circuit (3A) stores the 512 pixels in the second horizontal period. The signal is sampled and held.

Similarly, pixel electrodes e(s, x) to e(s, 5
12), e(7p") ~e(7,512), -"
”, pixel signals are sequentially applied to e(511,1)-e(512,512) every horizontal period, and are held in the capacitor C8 attached to the liquid crystal capacitor COs.

In addition, in the even field, the start signal SF,
becomes high level, vertical shift register 1 (5B
) operates, pixel electrodes e(2,1) to e(2,512)
, e(4t 1 ) ゞe(4s !S 12 ) ,
“””””, e(s t 2 , 1 ) ~e<5sz
, 512) are sequentially applied every horizontal period, and are held in the liquid crystal capacitor Co and the adjacent capacitor C8.

Therefore, when polarized light enters the liquid crystal device (IR) of the example in FIG. 2 through the transparent electrode el, the pixel electrodes e(x, x) to e(
The plane-polarized light of the red primary color signal SR applied to the red primary color signals SR, sxz, 512) is obtained as reflected light, that is, an image is obtained as a polarization rotation latent image.

Although the liquid crystal device (IR) has been described above, the liquid crystal devices (IG) and (IB) are similarly configured. However, due to image composition, for the pixel electrode of the liquid crystal device (IR),
The pixel electrodes of the liquid crystal device (IG) are placed at oppositely symmetrical positions, and the pixel electrodes of the liquid crystal device (IB) are placed at the same position.

Returning to Figure 1, αe is the polarizing beam splitter, (17
) is a blue-reflecting dichroic mirror, and α-second is a red-reflecting dichroic mirror. These are sequentially plated, and a liquid crystal device (IG) is arranged on the straight side of the mirror α, and a liquid crystal device (IR) is placed on the reflective side. will be arranged. Also, mirror αη
A liquid crystal device (IB) is disposed on the reflective side of the mirror via an optical path matching glass screen for distance adjustment. In this case, the liquid crystal device (
Each pixel of the image corresponding to each pixel electrode of IR), (IG), and (IB) is arranged so as to match.

In FIG. 1, (A) is a xenon lamp constituting a light source, and 01 is an internal mirror. In addition, (c) is a cold type parallelizing concave lens, (support) is an aperture (23
The light shielding plate having a) is an optical bandpass filter that passes only visible light. The light from the xenon lamp is made into parallel light by a lens, and then passes through the aperture (23a).
It is supplied to the beam splitter (le) and is divided into the P component polarized light zp that travels straight and the S component polarized light IS that is reflected.The S component polarized light Ig is converted into red, green, and blue color light by the mirror αD and the mirror). It is decomposed into SR+NOSG and /SB, and the liquid crystal device (IR), (IG) and (IB
).

In FIG. 1, (C) is a zoom projection lens, and (C) is a screen.

The example in Figure 1 is configured as described above, and when colored light JSR enters the liquid crystal device (IR), polarized light whose polarization plane is rotated for each pixel electrode according to the pixel signal of the red primary color signal sB is obtained as reflected light. This is then supplied to the beam splitter H again. In this case, only the P-component polarized light generated by the rotation of the polarization plane goes straight and is supplied to the zoom projection lens (c), and the remaining S-component polarized light is reflected and returns to the xenon lamp (a). The same applies to the colored lights/SG and JSB incident on the liquid crystal devices (IG) and (IB).

FIGS. 7 and 8 illustrate the above principle. In the figures, (27) is a polarizing beam splitter, (C) is a liquid crystal, and (C) is a reflection plate. Note that in these figures, arrows indicate the direction of the polarization plane. First, Figure 7 shows a state where no voltage is applied to the liquid crystal (C). In this case, the plane of polarization of the polarized light (indicated by the broken line) that has passed through the liquid crystal (C) and returned to the beam splitter (C). There is no rotation, only S component polarization. Therefore, in this case, all of the light is reflected by the beam splitter (5). Next, Fig. 8 shows a state in which a voltage is applied to the liquid crystal (c), and in this case, the liquid crystal (c) is
The plane of polarization of the polarized light (shown by the broken line) that has passed through the beam splitter (5) and returned to the beam splitter (5) is rotated by 2θ, so that only the P component polarized light travels straight, and the S component polarized light is reflected. Here, if the S component polarized light before passing through the liquid crystal (C) is IO, then the P component polarized light 1, which passes straight through the beam splitter (5) after passing through the liquid crystal (C), is Io'=I. si# 2θsin'(''-)λ. r is the optical phase difference and λ is the wavelength.

In the end, the zoom projection lens (c) is supplied with image light for forming a red image, which is bright/dark modulated for each pixel, and image light for forming a green image and a blue image.
An enlarged color image is displayed on the screen (c).

According to the example in FIG. 1, light from a xenon lamp is used, and by increasing the brightness of this xenon lamp (a), a high-brightness color image can be obtained on the top of the screen. In this case, unlike the CRT type, the size of the unit pixel does not change, so in principle it is possible to obtain high brightness and high resolution. Furthermore, the overall configuration is simpler and smaller than conventional devices, and can be easily constructed and handled, making it highly practical.

In the example shown in FIG. 1, the P-component polarized light IP that travels straight among the light supplied from the xenon lamp to the beam splitter is not used, but a separate image source (to) is used in the direction of this P-component polarized light IIP. If this is provided, this other image can also be displayed in the same way. In this case, since the P-component polarized light zp has a polarization plane perpendicular to the S-component polarized light lS, the rubbing direction of another image source is determined by the above-mentioned liquid crystal display device (IR
) to (IB) must be perpendicular to the rubbing direction.

If the rubbing direction is the same, for example, a child plate may be interposed.

Next, FIG. 9 shows another embodiment of the present invention.

In FIG. 9, parts corresponding to those in FIG. 1 are designated by the same reference numerals, and detailed explanation thereof will be omitted.

In the same figure, 01) is a reflecting mirror, 0tsu is a cold type (infrared reflective) collimating lens, (Foundation) is a light shielding plate with an aperture (34a), and (C) is an optical bandpass filter that passes only visible light. It is. The light from the xenon lamp is supplied to the collimating lens 0 side via the reflection mirror C31) and made into parallel light, and then supplied to the beam splitter aO through the aperture (34a) where it is reflected by the P component polarized light P which travels straight. It is divided into S component polarized light and S component.

Further, in FIG. 9, the P-component polarized light traveling straight through the beam splitter α0 is supplied to the zoom projection lens (c) via the relay lens (to) and the field lens C37).

The rest of the structure is the same as the example shown in FIG.

In this example in FIG. 9, by arranging the relay lens (G) and field lens 07), the projection lens (
There is an advantage that the area (image circle) for supplying image light to (c) can be made small, and therefore an inexpensive small zoom lens can be used as the projection lens (c).

Next, FIG. 10 also shows another embodiment of the present invention.

In FIG. 10, parts corresponding to those in FIG. 1 are designated by the same reference numerals, and detailed explanation thereof will be omitted.

In the same figure, (IRo), (IGo) and (IB
o) is a reflective liquid crystal device that rotates the plane of polarization for each pixel portion of the odd field based on the red, green, and blue primary color signals sB, SQ, and sB;
, (IGE) and (IDE) are reflective liquid crystal devices that rotate the plane of polarization for each pixel in an even field.

In the case of the example shown in FIG. 10, each primary color signal SR-SB has, for example, 1125 scanning lines and is of a 2:1 interlaced type.

FIG. 11 shows, for example, a liquid crystal device (IRo) and (IRE)
This shows that. These liquid crystal devices (IRo) and (I
RE) is configured as shown in FIG. In the figure, (52) is a terminal to which a start signal is supplied;
1) is a terminal to which a clock signal is supplied. The output terminals of each of the 512 stages of this vertical shift register (5) are FETs T(1,1) to T(1,512) and T(2), respectively.
,1)~T(2,512),......,T(
512,1) to T(512,512).

The rest of the configuration is the same as in the second example.

Returning to the 11th cause, the terminal (3A1) of the liquid crystal device (IRo)
and (3B1), the red primary color signal SR (shown in FIG. 13F) is connected to the terminals (2A2) and (2B2), respectively, the start signals SA and SR (shown in FIG. 13I and J) are connected to the terminal (2A2) and (2B2), respectively. 2A1) and (2B1) have a clock signal CLKo.
(shown in Figure 13-G), but the terminals (4 people) have a gate signal GA (shown in Figure 13-K) and a start signal So (
The AND signal (shown in Figure 13B) is connected to terminal (4B).
K is a gate signal GB (shown in Figure 13) and a start signal S. For which AND signal, the terminal (51) receives the pulse signal Pd (shown in Figure 13) at the horizontal frequency fH, and the terminal (52) receives the start signal S.

are supplied respectively.

On the other hand, terminals (3A1) and (3B) of the liquid crystal device (IRE)
l), the red primary color signal SR is connected to the terminals (2A2) and (2A
The husband start signals SA and sB are connected to the terminals (1) and 1).
) and (2Bt) are clock signals C'LKE (first
3H), the terminal (4A) receives the AND signal of the gate signal GA and the start signal SE (shown in FIG. 13C), and the terminal (4B) receives the gate signal GB and the start signal S.
The AND signal with E is sent to the terminal (51), and the pulse signal Pd is sent to the terminal (51).
However, a start signal SE is supplied to each terminal (52).

In addition, start pulse S. s -8E t clock signal C
LKo.

CLKK etc. are formed by a circuit as shown in FIG. 14, for example. In the figure, the vertical synchronizing signal Pv (shown in FIG. 13A) supplied to the terminal (to) is supplied as a trigger signal to the T flip-flop circuit 4 via the waveform shaping circuit 0, and its non-inverted and inverted Start signal S is applied to output terminals Q and Q, respectively. and SE are obtained. Also, the terminal (4
The horizontal synchronizing signal PH (frequency fH) supplied to υ is AF
The pulse signal P is supplied to the C circuit α and is more stable than this.
H is obtained. Further, the pulse signal PH is multiplied by 512×2 by a multiplier (A3) and then sent to a T flip-flop circuit (4
4) as a trigger signal, and clock signals CLKo and CL are supplied to its non-inverting and inverting output terminals Q and Q, respectively.
KE is obtained. Further, the pulse signal PH is supplied as a trigger signal to the T flip-flop circuit (c), and the signal SA (GB
) and 5B(GA) are obtained. Further, the vertical synchronizing signal PV and pulse signal PH passed through the waveform shaping circuit 02 are supplied to a field discrimination circuit G16), and a discrimination signal SI (shown in FIG. 13E) is obtained at its output side. This discrimination signal S■ is a flip-flop circuit (4G, (44
), (4!9 and the multiplier (4!9) are supplied as timing control signals, and the timings of the respective signals are controlled so as to have the relationship shown in FIG.

Further, as shown in FIG. 15, the red primary color signal sR is supplied through an r correction amplifier (4η) and a signal processing circuit (marked 4) for processing suitable for driving the liquid crystal.

The liquid crystal devices (IRo) and (IRE) are configured as described above, and in odd fields, a start signal S is sent.

Since this becomes a high level, the vertical register (5) of the liquid crystal device (IR) operates.

In the first horizontal period, the start signal SA goes high, so the horizontal shift registers (two) are in operation, and the sample and hold circuit (3A) is
Twelve pixel signals are sampled and held.

In the second horizontal period following the first horizontal period, the gate signal GA is at a high level, so FETTAI~TA5
12 is turned on. During this period, the output of the first stage of the vertical shift register (5) becomes high level)'ETT
(1,1) to 'r(1,512) are turned on. Therefore, during this period, 512 pixel signals in the first horizontal period are applied to the pixel electrodes e(1,1) to e(1,512) from the sample and hold circuit (3A), and the liquid crystal capacitance co
, is held in the attached capacity C8. Also, in this second horizontal period, the start signal sB becomes high level, so the horizontal shift register (2B) operates, and the sample and hold circuit (3B) receives the 512 pixel signals sampled in the second horizontal period. will be held.

In the third horizontal period following the second period, the gate signal aB
becomes high level, so FET TBl-TB512 is turned on. During this period, the vertical shift register (5
) becomes high level and FET'r(2,
1) to T(2,512) are turned on. Therefore, during this period, 512 pixel signals in the second horizontal period are applied to the pixel electrodes e(z, 1) to e(2,512)K from the sample and hold circuit (3B), and the liquid crystal capacitance co and the additional capacitance cB are respectively applied. is maintained. Also, in this third horizontal period, the start signal sA becomes high level, so the horizontal shift registers (2 people) operate, and the sample hold circuit (3 people) receives the 512 pixel signals in the third horizontal period. is sampled and held.

Pixel signals are applied sequentially every horizontal period, and the liquid crystal capacitance Co
n is maintained at the set capacity C8.

In addition, in an even field, the start signal SE becomes high level, so the vertical shift register (5) of the liquid crystal device (IRE) operates, and this liquid crystal device (IRE)
pixel electrode e (i, 1) - e (1,512) % e
(2,1)-e(2,5t2)s ””””',
Pixel signals are sequentially applied to e(stz, 1) to e(sxz, 512) every horizontal period, and the liquid crystal capacitance Co.

It is held in the attached capacity cB. In this case, the liquid crystal device (IR
The clock signal CLKE supplied to the horizontal shift registers (2A) and (2B) of the liquid crystal device (iRO
) is a phase-inverted version of the clock signal CLKo supplied to the horizontal shift registers (2A) and (2B) of
Liquid crystal device (IRE) pixel electrodes e(1,t) to e(s
lz, 512) K)! , Liquid crystal device (IRo) (7)
A pixel signal at a position shifted by one pixel in the horizontal direction with respect to the pixel signal applied to the pixel electrodes e(1,1) to e(512,512) is applied.

After all, when polarized light enters the liquid crystal device (IRQ), it is polarized for each pixel electrode according to the pixel signal of the odd field of the red primary color signal SR applied to the pixel electrode e(x, ge(stz, 512)). Polarized light with a rotated plane of polarization is obtained as reflected light.On the other hand, when polarized light enters a liquid crystal device (IRE), a red primary color signal sB is applied to pixel electrodes e(1,1) to e(512,512), respectively. Polarized light whose plane of polarization is rotated for each pixel electrode is obtained as reflected light in accordance with the even field pixel signal.

Although the liquid crystal devices (IRQ) and (IRE) have been described above, the liquid crystal devices (I Go ) and (IGE), and the liquid crystal devices (IBO) and (IDE) are similarly configured.

Although not mentioned above, the arrangement of the pixel electrodes of each of the liquid crystal devices (IRo) and (IRE) is left-right antisymmetric for image composition. This applies to liquid crystal devices (IGO) and (IGE), and liquid crystal devices (IBO) and (IBg
) The same applies between In this case, the liquid crystal device (I
If RQ), (IBO), and (IGE) are positive, the liquid crystal device (IRE), (IDE), and (IGO
) is considered to be the opposite. Furthermore, as will be described later, due to the difference in the plane of polarization of the incident polarized light, liquid crystal devices (IRE), (IGE
), (IDE) rubbing direction is the liquid crystal device (IRQ
), (IGO), and (IBO).

In addition, in Fig. 1θ, (4 is a polarizing beam splitter, 60 is a blue-reflecting gicchroic mirror, 61) is a red-reflecting gicchroic mirror, and these are sequentially installed. (IGo) and a liquid crystal device (IRo) on the reflective side thereof. Further, a liquid crystal device (IBO) is arranged on the reflection side of the mirror 50 via an optical path matching glass 62 for distance adjustment. In addition, a blue-reflecting dichroic mirror and six red-reflecting dichroic mirrors are sequentially installed on the straight-forward side of the beam splitter G19), and a liquid crystal device (IG
E) is arranged, and a liquid crystal device (IRE) is arranged on its reflective side. Further, a liquid crystal device (IDE) is arranged on the reflective side of the open mirror via an optical path matching glass 551 for distance adjustment. Further, (g) is an optical path matching glass disposed between the beam splitter (49) and the zoom projection lens C251.

In this case, each pixel of the image corresponding to each pixel electrode of the liquid crystal device (IRo) and (1 to , are arranged so as to be shifted in the vertical direction by one pixel. The same applies to the liquid crystal devices (IGO) and (1-), and the liquid crystal devices (IB, ) and (IBE). Also, liquid crystal devices (IRQ), (IGO) and (I
Each pixel of the image corresponding to each pixel electrode of the liquid crystal device (IRE), (IGE) and (IDE) is arranged so that each pixel of the image corresponding to each pixel electrode of the liquid crystal device (IRE), (IGE) and (IDE) is matched. be done.

Further, the light source and other components are constructed in the same manner as in the example shown in FIG.

In the example shown in FIG. 10, the light from the xenon lamp is converted into parallel light by the lens (2), and then the light from the aperture (23a)
The light is supplied to the beam splitter 09), where it is divided into P-component polarized light Jp, which travels straight, and S-component polarized light ZS, which is reflected. Then, the S component polarized light Is is decomposed by the mirror group and 51) into red, green and blue color lights 1sRp IsG and 18B, which enter the liquid crystal devices t (IR□), (IGo) and (IB.), respectively. be made into On the other hand, the P component polarized light lP is converted into red, green, and blue color light JPR, l! by mirrors (to) and (b). PG and 7PB K are decomposed into liquid crystal devices (IRE), (1()g) and (IDE), respectively.
K is made incident.

When colored light SR enters the liquid crystal device (IRQ), polarized light whose plane of polarization is rotated for each pixel electrode according to the odd field pixel signal of the red primary color signal sR is obtained as reflected light, and this is reflected back to the beam splitter 00. Supplied. In this case, only the P-component polarized light generated by the rotation of the polarization plane travels straight and is supplied to the zoom projection lens (c), and the remaining S-component polarized light is reflected and returns to the xenon lamp. The same applies to the colored lights 1sG and IsB incident on the liquid crystal devices (IGO) and (IBO).

Also, when colored light JPR enters the liquid crystal device (IRE),
Polarized light whose plane of polarization is rotated for each pixel electrode in accordance with the even field pixel signal of the red primary color signal SR is obtained as reflected light, and this is again supplied to the beam splitter 0. In this case, only the S-component polarized light generated by the rotation of the polarization plane is reflected and supplied to the zoom projection lens (c), and the remaining P-component polarized light travels straight back to the xenon lamp.

Colored light JPG incident on liquid crystal device (1-) and (IDE)
The same applies to JPB.

In the end, the zoom projection lens (c) has image light that is bright/dark modulated for each pixel to form a red image of odd and even fields, and an image light that is to form a green image and a blue image of odd and even fields. Light is supplied so that an enlarged color image is displayed on the screen (E).

In this case, the pixels of each color image in the odd field match each other, and the pixels of each color image in the even field also match. The pixels of each color image in the odd and even fields are shifted by one pixel in the horizontal direction and by one pixel in the vertical direction (see FIG. 16).

According to the example in FIG. 10, in addition to obtaining the same effects as in the example in FIG. Since the pixels of the field and the even field are shifted and displayed, higher resolution can be obtained.

In the example shown in FIG. 10, the pixels of the odd and even fields are displayed with shifts.
For example, it is conceivable to display pixels of each color image in a shifted manner within the same field. In addition, in this example in FIG. 10, liquid crystal devices (IRE), (IGE),
(IBE) rubbing direction to liquid crystal device (IRo),
The direction is orthogonal to the rubbing direction of (IGo) and (IBo), but a plate is provided immediately after the injection of beam splitter 0CJ, and P that goes straight through beam splitter 0CJ is
By rotating the polarization plane of the component polarized light by 90 degrees, the rubbing direction of the liquid crystal device (IRE), (IGE), (IDE) can be changed to that of the liquid crystal device (iRo), (IGO),
(tBo) may be in the same direction as the rubbing direction. In this case, since the deflection plane of the reflected light is rotated an additional 900 times, there is no problem in terms of operation.

Effects of the Invention As is clear from the embodiments described above, according to the present invention, light from a light source is utilized, and by increasing the brightness of the light source, a high-brightness image can be obtained. Furthermore, in this case, unlike in the CRT type, the size of the unit pixel does not change, so high brightness and high resolution can be obtained.

Furthermore, the overall configuration is simpler than conventional devices, and can be easily constructed and handled, making it highly practical.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing one embodiment of the present invention, Fig. 2, Fig. 3
5 and 6 are configuration diagrams showing the reflective liquid crystal device used in the example shown in FIG. 1, FIG. 4 is a diagram for explaining its operation, and FIGS. FIGS. 9 and 10 are configuration diagrams showing other embodiments of the present invention, and FIGS. FIG. 13 is a diagram for explaining the operation of the reflective liquid crystal device used in the illustrated example, and FIG. 16 is a diagram for explaining the example in FIG. 10. (IR), (IG), and (IB) are reflective liquid crystal devices, αQ is a polarizing beam splitter, αη is a blue-reflecting dichroic mirror, the cap is a red-reflecting dichroic mirror, the hood is a xenon lamp, and (C) is a zoom projection The lens (E) is the screen.

Claims (1)

[Claims] It includes a light source, a broadband polarizing beam splitter, a reflective liquid crystal device that rotates the plane of polarization for each pixel based on a video signal, and a projection lens, and the light from the light source passes through the polarizing beam splitter to the polarizing beam splitter. incident on the liquid crystal device,
A projection type image display device characterized in that reflected light from the liquid crystal device is projected onto a screen via the polarizing beam splitter and the projection lens, and an enlarged image is displayed on the screen.