JP2018084787A - Liquid crystal projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal projector that uses a ferroelectric liquid crystal panel to project images by field sequential color system, and makes an excellent moving image display although it has a simple configuration.SOLUTION: In a liquid crystal projector 10 for projecting images by field sequential color system, an LED 11 for emitting green light illuminates an FLC panel 14, and LEDs 21 and 31 for emitting red light and blue light respectively illuminate an FLC panel 24. When the FLC panel 14 is displaying a green image, the LED 11 is turned on, and when the FLC panel 24 is displaying a red and blue image, the LEDs 21 and 31 are turned on. A period when the LED 11 is turned on arrives between a period the LED 21 is turned on and a period the LED 31 is turned on, and after the period the LED 31 is turned on.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a liquid crystal projector that uses a ferroelectric liquid crystal panel to project an image by a field sequential color system.

  One image is divided into a red image, a green image, and a blue image based on color, and the divided images are displayed in a time-sequential manner at a high speed, and a field sequential color method (hereinafter referred to as “FSC”) is used to reconstruct the one image. Is sometimes referred to as “method”. In this FSC system, a liquid crystal projector that displays a full color image by projecting red, green, and blue images that are time-divisionally displayed on a liquid crystal panel onto a screen has been proposed (for example, Patent Document 1).

  Therefore, FIG. 5 of Patent Document 1 is shown again in FIG. 3, and the liquid crystal projector 100 shown in Patent Document 1 will be described. In addition, the code | symbol is changed in FIG. FIG. 3 is a schematic diagram of a liquid crystal projector 100 shown as a conventional example. As shown in FIG. 3, the liquid crystal projector 100 includes small arc type CNT light sources 108, 109, 110, a reflector 114, a polarizing beam splitter 115, a reflective liquid crystal panel 116, and a projection lens 112.

  The small arc type CNT light sources 108, 109, and 110 emit light in red, green, and blue, respectively. The reflector 114 efficiently sends light to the reflective liquid crystal panel 116. The polarization beam splitter 115 separates light into P and S polarized light, transmits one, and reflects the other. The reflective liquid crystal panel 116 displays a red image, a green image, and a blue image in a time division manner. The projection lens 112 projects an image drawn on the reflective liquid crystal panel 116 onto a screen.

  In the liquid crystal projector 100, when the reflective liquid crystal panel 116 displays a red image, the small arc type CNT light source 108 that emits red light is turned on, and the red image is projected onto the screen. Similarly, when the reflective liquid crystal panel 116 displays a green image (blue image), the small arc type CNT light source 109 (110) emitting green (blue) light is turned on, and a green (blue) image is projected on the screen. The In addition, () indicates replacement. In the FSC system, a natural full color image (one image) can be obtained by switching between a red image, a green image, and a blue image at high speed. Also, moving images can be displayed by continuously switching full-color images.

Japanese Patent Laying-Open No. 2002-40388 (FIG. 5)

  As described above, in an FSC liquid crystal projector, an image displayed on a liquid crystal panel must be rewritten at high speed. A ferroelectric liquid crystal panel is known as a liquid crystal panel capable of rewriting a display image at a high speed (hereinafter sometimes referred to as “FLC panel”). This FLC panel can rewrite an image at a speed about 10 to 100 times that of a widely used TN (twisted nematic) liquid crystal panel.

However, since the FLC panel is so-called AC driving, when one image is displayed, a voltage having an opposite sign must be applied to the liquid crystal for the same period. The image is not displayed normally during the period in which the voltage of the opposite sign is applied. For this reason, in the liquid crystal projector employing the FSC method, the FLC panel is not illuminated during this period. That is, when the FLC panel is applied to the liquid crystal projector shown in FIG. 3, a non-display period having the same length as the display period appears on the screen. During this non-display period, flickering occurs on the screen, and color breaks (color noise generated at the edges of moving images) are noticeable. In particular, it is known that color breaks are remarkable in moving image display.

  Therefore, the present invention has been made in view of the above problems, and provides a liquid crystal projector suitable for moving image display with a simple configuration when a ferroelectric liquid crystal panel is used to project an image by a field sequential color method. The purpose is to do.

  In order to solve the above problems, a liquid crystal projector of the present invention is a liquid crystal projector that projects an image displayed on a ferroelectric liquid crystal panel by a field sequential color method, and one image is a first color, a second color, and a third color. The first light source that emits light in the first color when the period in which the first image is decomposed into the first image, the second image, and the third image and the one image is reconstructed is a frame period, and the second color A second light source that emits light, a third light source that emits light in the third color, a first ferroelectric liquid crystal panel, and a second ferroelectric liquid crystal panel, wherein the first light source includes the first image. The second light source is turned on in the second period for projecting the second image, the third light source is turned on in the third period for projecting the third image, One frame period for reconstructing the one image Characterized by consisting of two said first period and one of the second period and one of the third period.

  The first ferroelectric liquid crystal panel may display the first image, and the second ferroelectric liquid crystal panel may display the second image and the third image.

  The first color may be green.

  The first ferroelectric liquid crystal panel or the second ferroelectric liquid crystal panel is of a reflective type, and a first beam splitter or a second is provided in front of the first ferroelectric liquid crystal panel or the second ferroelectric liquid crystal panel. A beam splitter is disposed, and the first ferroelectric liquid crystal panel and the first light source are disposed perpendicular to the first beam splitter, or the second ferroelectric is disposed relative to the second beam splitter. The liquid crystal panel and the second light source may be arranged orthogonally.

  The first ferroelectric liquid crystal panel or the second ferroelectric liquid crystal panel is a reflection type, a rectangular beam-shaped third beam splitter, and an RGB light source in which the first, second, and third light sources are assembled, A projection lens, and the first, second, third and fourth side surfaces of the third beam splitter are respectively provided with the first ferroelectric liquid crystal panel, the second ferroelectric liquid crystal panel, the RGB light source, and The projection lens is disposed oppositely, a polarizing plate and a third ferroelectric liquid crystal panel are disposed between the third side surface and the RGB light source, and the third ferroelectric liquid crystal panel transmits a p-wave. It may be switched between emitting or emitting s waves.

  In the liquid crystal projector of the present invention, one image is decomposed into a first image corresponding to the first color, a second image corresponding to the second color, and a third image corresponding to the third color. Reconstruct one image on the screen. At this time, one frame period is composed of four fields. Of these four fields, two are the first period for projecting the first image, and the remaining are the second period for projecting the second image and the third period for projecting the third image. For example, the second image is projected on the screen, the first image is projected, the third image is projected, and then the first image is projected again.

  In the liquid crystal projector of the present invention, when one ferroelectric liquid crystal panel displays an image for projection, the other ferroelectric liquid crystal panel displays an image that is not projected in order to satisfy the AC drive condition. To do. By replacing the relationship between one and the other for each field, the non-display period is eliminated on the screen.

  That is, flickering and motion breaks are greatly improved by making it possible to increase the frame frequency by configuring one frame period with a small number of fields and eliminating the non-display period on the screen.

  As described above, when the liquid crystal projector of the present invention uses a ferroelectric liquid crystal panel and projects an image by the field sequential color method, it can display a good moving image with a simple configuration.

1 is a schematic diagram of a liquid crystal projector shown as a first embodiment of the present invention. 2 is a timing chart of the liquid crystal projector shown in FIG. 1. It is the schematic of the liquid crystal projector shown as a prior art. It is the schematic of the liquid crystal projector shown as 2nd Embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. In addition, the invention specific matter shown in a claim is described in ().

(First embodiment)
FIG. 1 is a schematic diagram of a liquid crystal projector 10 shown as the first embodiment of the present invention. In the figure, rays L1 and L2 are added. The liquid crystal projector 10 includes an LED 11 (first light source) that emits green light (first color), an LED 21 (second light source) that emits red light (second color), and an LED 31 (light that emits blue light (third color)). FLC panel 14 (first ferroelectric liquid crystal panel) that displays a third light source), a green image (first image), and an FLC panel that displays a red image (second image) and a blue image (third image) 24 (second ferroelectric liquid crystal panel).

  The LED 11 is disposed in the reflecting mirror 12. The reflecting mirror 12 changes the light emitted from the LED 11 into a parallel light beam L1. The light beam L1 is reflected by the beam splitter 13 (first beam splitter) and reaches the FLC panel 14. Further, the light beam L1 is reflected by the FLC panel 14, passes through the beam splitter 13, is reflected by the dichroic prism 15, and is imaged by a projection lens 16 on a screen (not shown).

  The beam splitter 13 reflects one polarization component and transmits the other polarization component. Accordingly, only one polarization component of the light beam L1 reaches the FLC panel 14. In the FLC panel 14, the polarization state changes due to the retardation of the FLC layer, and the other polarization component appears. The other polarization component passes through the beam splitter 13 and reaches the dichroic prism 15. The dichroic prism 15 reflects green, which is the emission color of the LED 11, and transmits other colors. That is, the distribution of the other polarization component in the FLC panel 14 corresponds to displaying a green image. The green image is visible through the beam splitter 13.

  In the liquid crystal projector 10, a parallel light beam L <b> 1 is obtained by the reflecting mirror 12. However, when the LED 11 uses a package that emits light only forward (to the beam splitter 13 side), a lens instead of the reflecting mirror 12 may be used to obtain parallel light rays. The dichroic prism 15 may be a dichroic mirror.

  Similarly, the LEDs 21 and 31 are disposed in the reflecting mirror 22. The reflecting mirror 22 converts the light emitted from the LEDs 21 and 31 into a parallel light beam L2. The light beam L2 is reflected by the beam splitter 23 (second beam splitter) and reaches the FLC panel 24. Further, the light beam L 2 is reflected by the FLC panel 24, passes through the beam splitter 23, passes through the dichroic prism 15, and forms an image on a screen (not shown) by the projection lens 16.

  The beam splitter 23 reflects one polarization component and transmits the other polarization component. Therefore, only one polarization component of the light beam L2 reaches the FLC panel 24. Even in the FLC panel 24, the polarization state is changed by the retardation of the FLC layer, and the other polarization component appears. This other polarization component passes through the beam splitter 23 and reaches the dichroic prism 15. The dichroic prism 15 transmits blue and red light emission colors of the LEDs 21 and 31, and reflects other colors. That is, similarly to the FLC panel 14, the distribution of the other polarization component in the FLC panel 24 corresponds to a red image or a blue image.

  The reflecting mirror 22 is replaced with a lens if the LEDs 21 and 31 are a package that emits only forward (to the beam splitter 23 side). Further, since the LEDs 21 and 31 must be disposed in the vicinity of the focal point of the reflecting mirror 22 (or lens), the LEDs 21 and 31 may be a single package that can switch between red and blue light emission.

The FLC panels 14 and 24 are so-called LCOS (Liquid Crystal on).
Ferroelectric liquid crystal (FLC) is used for the liquid crystal layer of Silicon. The LCOS has a display area and a circuit area on a Si substrate. The display area includes reflective electrodes (pixels) arranged in a matrix and switch elements connected to the reflective electrodes, and a liquid crystal layer and transparent glass are laminated. The switch element conducts when rewriting the voltage held by each reflective electrode. The circuit area includes an image memory, a timing control circuit, a level shifter, and the like.

  The controller 17 generates a green image with only the green component, a red image with only the red component, and a blue image with only the blue component from one image, and the green image data is converted into the FLC panel 14, the red image data, and the blue image data. Send data to FLC panel 24. Further, the controller 17 controls the display timing of the FLC panels 14 and 24, and controls the lighting of the LEDs 11, 21, and 31 in synchronization with this timing.

  FIG. 2 is a timing chart of the liquid crystal projector 10. FIG. 2A shows the display state of the FLC panel 24, and FIG. 2B shows the display state of the FLC panel 14. In FIG. 2, R1 +, G1 +, and B1 + indicate periods during which a red image, a green image, and a blue image are displayed for one image, respectively. R1−, G1−, and B1− are periods in which reverse polarity voltages are applied at the same time after the periods R1 +, G1 +, and B1 + in order to satisfy the condition of AC driving. Note that the reverse polarity voltage means that each pixel has the same absolute value and the opposite polarity. The period in which the numerical part is different is a period in which a red (green or blue) image constituting another image indicated by the numeral is displayed (or a period in which a voltage having a reverse polarity is applied).

As described above, in the FSC system, a red image (red field), a green image (green field), and a blue image (blue field) obtained by separating one image (frame) based on color are displayed in time series. Reconstruct one image. In FIG. 2, one frame period indicated by A is a period for projecting a red image (second period), a period for projecting a green image (first period), and a period for projecting a blue image (third period). , A period for projecting a green image (first period). That is, the LEDs 21, 11, 31, 11 (see FIG. 1) are lit in the second, first, third, and first periods, respectively. At this time, a red image, a green image, a blue image, and a green image are projected in time series on the screen, and one image is reconstructed in one frame period. That is, in the driving method shown in FIG. 2, one frame is composed of four fields, and there is a period (first period) in which a green image is displayed twice within one frame.

  In the first field B1 of the frame period A, when a red image is displayed on the FLC panel 24, the LED 21 that emits red light is turned on. In the field B1, the reverse polarity voltage of the green image constituting another one image indicated by 0 is applied to the FLC panel 14.

  In the second field B2, when a green image is displayed on the FLC panel 14, the LED 11 that emits green light is turned on. In the field B2, the reverse polarity voltage of the red image constituting one image is applied to the FLC panel 24. Since the green image display period G1 + exists twice during the frame period A, the light emission intensity of the LED 11 is made half of the light emission intensity of the LED 21.

  In the third field B3, when a blue image is displayed on the FLC panel 24, the LED 31 that emits blue light is turned on. In the field B3, the reverse polarity voltage of the green image constituting one image is applied to the FLC panel 14.

  In the last field B4, when a green image is displayed on the FLC panel 14, the LED 11 that emits green light is turned on. In the field B4, the reverse polarity voltage of the blue image constituting one image is applied to the FLC panel 24. Similarly to the field B2, since the green image display period G1 + exists twice in the frame period A, the light emission intensity of the LED 11 is set to half the light emission intensity of the LEDs 21 and 31.

In the frame period A, the arrangement of the first, second, and third periods is not limited to the above. For example, the display periods of the FLC panels 14 and 24 in the frame period A are respectively
R1 +, R1-, B1-, B1 +,
And G1-, G1 +, G1 +, G1-,
It is also good.

If only the non-display period is to be eliminated, two FLC panels may be prepared and one frame period may be composed of even fields. For example, when one frame period is composed of 6 fields, the display periods of the FLC panels 14 and 24 are respectively
R1 +, R1-, G1 +, G1-, B1 +, B1-,
When,
R1-, R1 +, G1-, G1 +, B1-, B1 +,
It can be considered. However, in such a field configuration, since the frame period becomes long, flicker and color break become conspicuous. In addition, referring to FIG. 1, LEDs that emit light in red, green, and blue must be provided in the reflecting mirrors 12 and 22, respectively, which complicates the component configuration.

  As described above, the liquid crystal projector 10 projects a red image in the field B1, a green-red image in the field B2, a blue image in the field B3, and a green image in the field B4 on the screen to reconstruct one image. Yes. That is, the liquid crystal projector 10 eliminates the non-display period on the screen and shortens the frame period A. As a result, the flicker and color break are not noticeable in the projected image.

Note that a period in which the voltage held by each pixel of the FLC panels 14 and 24 is rewritten is assigned to the first part of one field. This period is a short time in one field but generates display noise. Since the liquid crystal projector 10 does not make this noise conspicuous, the LEDs 11, 21, and 31 are turned off during the rewriting period.

  Further, in order to clarify the operational effects of the liquid crystal projector 10, the liquid crystal projector 100 is compared with the liquid crystal projector 100 shown in FIG. In the liquid crystal projector 100, one frame period must be composed of six fields in order to satisfy AC driving. On the other hand, the liquid crystal projector 10 is composed of four fields in one frame period. For this reason, the frame frequency can be increased. If the frame frequency can be increased, flicker and color breaks will not be noticeable.

  In the liquid crystal projector 100, half of one frame period is a non-display period, whereas in the liquid crystal projector 10, there is no non-display period on the screen. For this reason, in the liquid crystal projector 10, compared with the liquid crystal projector 100, the brightness of the LEDs 21 and 31 at the time of lighting can be reduced to 2/3. That is, it becomes possible to relax the required specifications of the LED 21 and the like.

  Further, in the liquid crystal projector 10, a field for displaying a green image appears twice in one frame period A (fields B2 and B4). As a result, the emission intensity of the LED 11 that emits green light can be half that of the LEDs 21 and 31 that emit red and blue light. This is advantageous for a green light emitting LED (LED 11) having a light emitting efficiency lower than that of red and blue light emitting LEDs (LEDs 21, 31). That is, the liquid crystal projector 10 can effectively use the green light emitting LED (LED 11).

  In the liquid crystal projector 10, the FLC panels 14 and 24 are reflective. In the liquid crystal projector of the present invention, the FLC panel may be a transmissive type. At this time, since the first to third light sources can be back illuminated and the first and second beam splitters can be polarizing plates, the structure is simplified.

(Second Embodiment)
The liquid crystal projector 10 shown in FIG. 1 uses beam splitters 13 and 14 and a dichroic prism 15 for polarization processing and light synthesis. The polarization processing and the light synthesis are not limited to this configuration, and can be realized by only one beam splitter, for example. Therefore, referring to FIG. 4, a liquid crystal projector 40 that performs polarization processing and light synthesis by one beam splitter 45 will be described as a second embodiment of the present invention.

  FIG. 4 is a schematic diagram of the liquid crystal projector 40. In the figure, rays L3 and L4 are added. The liquid crystal projector 40 includes an FLC panel 43 (first ferroelectric liquid crystal panel) that displays a green image (first image), and an FLC panel 44 that displays a red image (second image) and a blue image (third image). (Second ferroelectric liquid crystal panel), square columnar beam splitter 45 (third beam splitter), LED 41g (first light source) that emits green light (first color), and red (second color) light. An RGB light source 41 including an LED 41r (second light source) and an LED 41b (third light source) that emits blue light (third color) and the projection lens 16 are provided.

  On the four side surfaces (first, second, third, and fourth side surfaces) of the beam splitter 45, the FLC panel 43, the FLC panel 44, the RGB light source 41, and the projection lens 46 are arranged to face each other. The RGB light source 41 is disposed at the focal position of the reflecting mirror. A polarizing plate 48 and an FLC panel 49 (third ferroelectric liquid crystal panel) are disposed between the side surface (third side surface) of the beam splitter 45 and the RGB light source 42.

The reflecting mirror 42 emits light emitted from the RGB light source 41 into parallel light beams L3 and L4. The polarizing plate 48 and the FLC panel 49 switch whether to emit a p-wave or s-wave. That is, at the time of exiting the FLC panel 49, the light beam L3 is p-wave (referred to as one polarization in the first embodiment), and the light beam L4 is s-wave (referred to as the other polarization in the first embodiment). It is. The light beam L 3 passes through the beam splitter 45 and reaches the FLC panel 43. Further, the light beam L3 is reflected by the FLC panel 43 and the beam splitter 45, and formed on a screen (not shown) by the projection lens 46. The light beam L 4 is reflected by the beam splitter 45 and reaches the FLC panel 44. Further, the light beam L 4 is reflected by the FLC panel 44, passes through the beam splitter 45, and forms an image on a screen (not shown) by the projection lens 46.

  The method of switching between whether the FLC panel 49 emits p-waves or s-waves is as follows. The FLC panel 49 is obtained by sandwiching a ferroelectric liquid crystal between two glass plates provided with a solid electrode. In the following description, it is assumed that a p wave is incident on the FLC panel 49 from the polarizing plate 48. The FLC panel 49 is used as a phase difference plate in order to perform the s-p conversion of polarized light by the FLC panel 49. For this purpose, the birefringence amount of the ferroelectric liquid crystal layer is set to 1 / 2λ (λ is the wavelength of light in the medium). Specifically, the cell gap is set to about 1.4 μm in currently available liquid crystal materials. Further, linearly polarized light (p wave) incident on the FLC panel 49 is set to be perpendicular or parallel to the liquid crystal molecules. Furthermore, when a voltage is applied to the ferroelectric liquid crystal layer, the liquid crystal molecules are switched by 45 °. In this way, a p-wave is emitted from the FLC panel 45 when no voltage is applied, and an s-wave is emitted when a voltage is applied.

  The beam splitter 45 transmits the p wave and reflects the s wave. Accordingly, the light beam L3 reaching the FLC panel 43 becomes a p-wave. In the FLC panel 43, the polarization state changes due to retardation of the FLC layer, and an s wave appears. This s-wave component is reflected by the beam splitter 45, passes through the projection lens 46, and reaches the screen. Similarly, the light beam L3 reaching the FLC panel 44 becomes an s wave. In the FLC panel 44, the polarization state changes due to the retardation of the FLC layer, and a p-wave appears. This p-wave component passes through the beam splitter 45 and reaches the screen via the projection lens 46.

  In the liquid crystal projector 40, parallel light beams L3 and L4 are obtained by the reflecting mirror. However, when the RGB light source 41 employs a package that emits light only forward (to the beam splitter 45 side), a lens instead of the reflecting mirror 42 may be used to obtain parallel light rays.

  The FLC panels 43 and 44 are the same as the FLC panels 14 and 24 included in the liquid crystal projector 10 shown in FIG. The controller 47 is the same as the controller 17 included in the liquid crystal projector 10 except that it has a function of applying or not applying voltage to the FLC panel 49 for sp conversion.

  The operation of the liquid crystal projector 40 will be described with reference to FIG. That is, FIG. 2 is regarded as a timing chart of the liquid crystal projector 40. 2A shows the display state of the FLC panel 44, and FIG. 2B shows the display state of the FLC panel 43. In FIG. 2, A1 and B1 to 4 such as R1 + are the same as the period in the projector 10.

  In the first field B1 of the frame period A, when a red image is displayed on the FLC panel 44, the LED 41r that emits red light is turned on. In the field B1, the reverse polarity voltage of the green image constituting another one image indicated by 0 is applied to the FLC panel 43.

  In the second field B2, when a green image is displayed on the FLC panel 43, the LED 41g that emits green light is turned on. In the field B2, the reverse polarity voltage of the red image constituting one image is applied to the FLC panel 44. Since the green image display period G1 + exists twice in the frame period A, the light emission intensity of the LED 41g is set to half the light emission intensity of the LED 41r.

  In the third field B3, when a blue image is displayed on the FLC panel 44, the LED 41b that emits blue light is turned on. In the field B3, the reverse polarity voltage of the green image constituting one image is applied to the FLC panel 43.

  In the last field B4, when a green image is displayed on the FLC panel 43, the LED 41g that emits green light is turned on. In the field B4, the reverse polarity voltage of the blue image constituting one image is applied to the FLC panel 44. Similarly to the field B2, since the green image display period G1 + exists twice in the frame period A, the light emission intensity of the LED 41g is set to half of the light emission intensity of the LEDs 41r and 41b.

  As described above, the liquid crystal projector 40 can simplify the optical system by using the polarizing plate 48 and the FLC panel 49 that enable sp conversion as compared with the liquid crystal projector 10 shown in FIG.

10, 40 ... Liquid crystal projector,
11, 41g ... LED (first light source),
12, 22, 42 ... Reflector,
13, 23, 45 ... Beam splitter (first, second, third beam splitter),
14, 43 ... FLC panel (first ferroelectric liquid crystal panel),
15 ... Dichroic prism,
16, 46 ... projection lens,
17, 47 ... Controller,
21, 41r ... LED (second light source),
24, 44 ... FLC panel (second ferroelectric liquid crystal panel),
31, 41b ... LED (third light source),
41 ... RGB light source,
48 ... Polarizing plate,
49 ... FLC panel (third ferroelectric liquid crystal panel)
L1, L2, L3, L4 ... rays,
R1 + ... a period for displaying a red image,
G1 +: Period during which the green image is displayed,
B1 +: Period during which a blue image is displayed,
R1-... Period for satisfying the AC drive condition for red image display,
G1-... Period for satisfying AC drive conditions for green image display,
B1--a period for satisfying the AC drive condition for blue image display,
A ... Frame period,
B1 ... Field for projecting a red image (second period),
B2, B4: Field for projecting a green image (first period),
B3: Field for projecting a blue image (third period).

Claims (5)

In a liquid crystal projector that projects an image displayed on a ferroelectric liquid crystal panel by a field sequential color method,
When one image is decomposed into a first image, a second image, and a third image based on the first color, the second color, and the third color, and the period for reconstructing the one image is a frame period,
A first light source that emits light in the first color;
A second light source that emits light in the second color;
A third light source that emits light in the third color;
A first ferroelectric liquid crystal panel;
A second ferroelectric liquid crystal panel,
The first light source is lit in a first period for projecting the first image;
The second light source is lit in a second period for projecting the second image,
The third light source is lit in a third period for projecting the third image;
The liquid crystal projector according to claim 1, wherein one frame period for reconstructing the one image includes two first periods, one second period, and one third period.   The liquid crystal projector according to claim 1, wherein the first color is green. The first ferroelectric liquid crystal panel displays the first image;
The liquid crystal projector according to claim 1, wherein the second ferroelectric liquid crystal panel displays the second image and the third image.   The first ferroelectric liquid crystal panel or the second ferroelectric liquid crystal panel is of a reflective type, and a first beam splitter or a second is provided in front of the first ferroelectric liquid crystal panel or the second ferroelectric liquid crystal panel. A beam splitter is disposed, and the first ferroelectric liquid crystal panel and the first light source are disposed perpendicular to the first beam splitter, or the second ferroelectric is disposed relative to the second beam splitter. 4. The liquid crystal projector according to claim 2, wherein the liquid crystal panel and the second light source are arranged orthogonally. The first ferroelectric liquid crystal panel or the second ferroelectric liquid crystal panel is a reflection type,
A quadrangular prism-shaped third beam splitter;
An RGB light source in which the first, second and third light sources are assembled;
A projection lens,
The first ferroelectric liquid crystal panel, the second ferroelectric liquid crystal panel, the RGB light source, and the projection lens face the first, second, third, and fourth side surfaces of the third beam splitter, respectively. Arranged,
A polarizing plate and a third ferroelectric liquid crystal panel are disposed between the third side surface and the RGB light source,
4. The liquid crystal projector according to claim 2, wherein the third ferroelectric liquid crystal panel switches between emitting p-waves and emitting s-waves. 5.