JP3327153B2 - Projection display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type display device which modulates a light beam from a light source according to image information by a light modulating means such as a liquid crystal panel and projects the modulated light beam on a projection surface. In particular, the present invention relates to a projection display device having two sets of light modulation means.

[0002]

2. Description of the Related Art Various types of projection display devices for projecting and displaying a color image by using a liquid crystal panel as a light modulating means are known. Among these, the most popular one is a three-panel system using three liquid crystal panels.
This is a projection type display device of a type called a single-panel type using one liquid crystal panel.

FIG. 7 shows a schematic configuration of an optical system of a commonly used three-panel projection type liquid crystal display device. In this drawing, reference numeral 1 denotes a light source lamp, and light from the light source lamp is reflected by a reflection mirror 2 to be emitted as a parallel light beam to the color separation optical system 11 side. Color separation optical system 1
1 includes dichroic mirrors 111 and 112 and a mirror 113. The dichroic mirror 111 is
The dichroic mirror 112 transmits the red light flux R but reflects the green and blue light fluxes G and B.
Reflects the green light flux G but transmits the blue light flux B. These two dichroic mirrors 111,
The white light beam W is separated into red, green, and blue light beams R, G, and B by 112.

After being separated, the light beams of the respective colors pass through the incident-side polarizing plates 53, 54, and 55, become linearly polarized light, and then enter three liquid crystal panels 63, 64, and 65 corresponding to the respective colors. Each of the liquid crystal panels 63, 64, and 65 has a configuration in which emission-side polarizing plates 73, 74, and 75 are stuck to their emission surfaces in an optically close contact state. These liquid crystal panels 63, 64, 65 modulate the incident light beam based on the given image information. The modulated light beams R, G, and B of the respective colors pass through the output-side polarizing plates 73, 74, and 75, respectively, and then enter dichroic mirrors 121 and 12 respectively.
2 and enters the color synthesizing optical system 12 having the mirror 123 and is synthesized into one modulated light beam. The synthesized modulated light beam is enlarged and projected on a projection surface 13 such as a screen via the projection lens optical system 10. As a color synthesizing optical system, one having a configuration using a prism optical system using a dichroic prism instead of a dichroic mirror is also known.

[0005] The three-panel projection display device has the advantage that it is possible to obtain a bright, high-resolution, high-definition image because of its high light use efficiency. On the other hand, since three liquid crystal panels are driven, a circuit system and an optical system are complicated, and the number of components constituting the projection display device is inevitably increased. As a result, there are drawbacks in that the outer shape and weight of the projection type display device are increased, and the manufacturing cost is also increased.

FIG. 8 shows a schematic configuration of an optical system of a generally used single-panel projection display device, and portions corresponding to those in FIG. 7 are denoted by the same reference numerals. It is. As shown in this figure, a white light beam W emitted from the light source lamp 1 and reflected by the reflection mirror 2 as a parallel light beam is transmitted through the incident-side polarizing plate 56 to become linearly polarized light, and then red, green, and blue ( R, G, and B) are incident on a liquid crystal panel 66 having color filters. An emission-side polarizing plate 76 is attached to the emission surface of the liquid crystal panel 66 in an optically close contact state. The liquid crystal panel 66 modulates the incident light beam based on the given image information. The light beam after the modulation passes through the exit-side polarizing plate 76 and is enlarged and projected on the screen 13 via the projection lens optical system 10.

The single-panel projection display device has the advantage that, unlike the three-panel projection display device described above, a small-sized, light-weight and inexpensive projection-type liquid crystal display device with a small number of components can be realized. Since the liquid crystal panel has R, G, and B color filters, about two-thirds of the amount of light incident on the liquid crystal panel is absorbed by the color filters, and the remaining three.
Only one in one is available. For this reason, there is a disadvantage that a projected image by the projection display device becomes dark. To solve this drawback, a larger amount of light may be incident on the liquid crystal panel. However, in this case, new adverse effects such as heat generation and increased power consumption occur.

On the other hand, as a projection type display device, a two-plate type projection type display device having an intermediate feature between the above-mentioned three-panel type and single-panel type is also known. FIG. 9 shows a schematic configuration of an optical system of a projection type display apparatus of this type. In this figure as well, parts corresponding to the respective parts in FIGS. 7 and 8 are denoted by the same reference numerals. It is. As shown in this figure, a light beam from a light source lamp 1 enters a polarizing beam splitter 3 via a reflection mirror 2, and is separated into a P-polarized light beam and an S-polarized light beam whose polarization axes are substantially orthogonal to each other.

The P-polarized light beam passes through the incident side polarizing plate 58 and enters the luminance securing liquid crystal panel 68. LCD panel 6
Reference numeral 8 denotes a configuration in which an emission-side polarizing plate 78 is attached to the emission surface in an optically intimate state, and modulates an incident light beam according to given image information. The light beam transmitted through the output side polarizing plate 78 is reflected by the reflection mirror 8 and is incident on the polarization beam splitter 9.
The incident side polarizing plate may be omitted if the polarized light beam of the polarizing beam splitter 3 is not linearly polarized light. However, since the polarized light beam is not linearly polarized enough to obtain a sufficient contrast ratio, A configuration in which an incident side polarizing plate is disposed is generally employed.

On the other hand, the S-polarized light beam passes through the incident side polarizing plate 57 via the mirror 4 and is incident on a liquid crystal panel 67 having R, G, and B color filters. The liquid crystal panel 67 has a configuration in which a light-exiting-side polarizing plate 77 is adhered to the light-exiting surface in a state of being in optical contact with the light-exiting surface, and modulates an incident light beam based on given image information.

The light emitted from each of the liquid crystal panels 67 and 68
The two modulated light beams are combined into one modulated light beam by the polarization beam splitter 9, and then enlarged and projected on the screen 13 via the projection lens optical system 10.

Using a reflection type liquid crystal panel, such a 2
An example of a plate-type projection display device is disclosed in, for example, JP-A-3-139938.

[0013]

In a two-panel projection display device having such a structure, an S-polarized light beam enters a liquid crystal panel having R, G, and B color filters for color display. , P-polarized light is incident on a black-and-white display panel to ensure luminance. Further, the light from the light source is separated into a P-polarized light beam and an S-polarized light beam by a polarizing beam splitter, and the light in each polarization direction is made incident on a liquid crystal panel having a polarizing plate with a polarization axis suitable for them. The amount of light absorbed by the side polarizer is reduced as much as possible to increase the light use efficiency. Further, since the number of parts is smaller than that of the three-panel type, it is possible to realize a projection type display device which is small, lightweight, inexpensive and can provide a bright display.

However, in the two-panel projection display device, of the two liquid crystal panels, only the liquid crystal panel having R, G, and B color filters contributes to color display. Therefore, the color purity of the projected image is the same as that of the single-panel projection display device. For this reason, it is possible to increase the use efficiency of the light source light amount to increase the luminance of the projected image by using the other luminance securing liquid crystal panel, but if an attempt is made to secure a certain level of color purity, It is necessary to greatly reduce the amount of light of the image for luminance. In other words, at present, the advantage of arranging the liquid crystal panel for securing the brightness cannot be effectively utilized. Therefore, in the conventional two-panel projection type liquid crystal display device, it is actually as much as expected. No projected image with brightness has been obtained.

An object of the present invention is to provide a two-panel projection display device capable of increasing the brightness while ensuring the color purity of a projected image in view of the above points.

[0016]

In order to solve the above-mentioned problems, a projection display device according to the present invention modulates a first polarized light beam, and transmits a red light transmitting region that transmits red light and a green light. A first light modulating unit having a first color filter layer having a green light transmitting region transmitting a blue light and a blue light transmitting region transmitting a blue light; and a polarization axis of the first polarized light beam being substantially orthogonal to each other. A second polarized light beam having a polarization axis, and a second light transmitting region that transmits cyan light, a magenta light transmitting region that transmits magenta light, and a second light transmitting region that transmits yellow light. A second light modulating means having a color filter layer, and projection optical means for projecting a combined image obtained by combining modulated light beams emitted from the first and second light modulating means,
The color light transmitted through each of the red light transmitting region, the green light transmitting region, and the blue light transmitting region is combined with the color light transmitted through each of the cyan light transmitting region, the magenta light transmitting region, and the yellow light transmitting region, and These regions are formed in the first and second color filter layers so as to overlap on an image.

In the projection type display device having this configuration, the luminance of the projected image and the color reproducibility are ensured by using both of the two sets of light modulating means. Therefore, compared to the conventional two-panel projection display device, the color purity is high,
Moreover, a bright projected image can be obtained.

In a typical structure of the present invention, the first color filter layer has a red light transmitting region transmitting only red light, a green light transmitting region transmitting only green light, and transmitting only blue light. Blue light transmitting area,
Similarly, the second color filter layer includes a cyan light transmitting region that transmits only cyan light, a magenta light transmitting region that transmits only magenta light, and a yellow light transmitting region that transmits only yellow light.

In this case, the color light transmitted through each of the red light transmitting area, the green light transmitting area, and the blue light transmitting area transmits through each of the cyan light transmitting area, the magenta light transmitting area, and the yellow light transmitting area. Color light and
What is necessary is just to employ | adopt the structure which these areas were formed in the said 1st and 2nd color filter layers so that it may overlap on the said composite image.

Further, in addition to the above configuration, the projection type display apparatus further comprises a light source, a polarization separating means for separating a light beam emitted from the light source into the first polarized light beam and the second polarized light beam, A configuration including light combining means for combining modulated light beams emitted from the first and second light modulation means is employed.

Here, as the first and second light modulating means, not only a light transmitting type but also a light reflecting type can be used.

When using a light reflection type light modulation means,
The polarization splitting means and the light combining means can be constituted by a common polarizing beam splitter made of a prism composite. That is, the light source, the first and second reflection-type light modulation units, and the projection unit may be arranged to face each other on the four outer surfaces of the polarization beam splitter. In the optical system having this configuration, the light emitted from the light source is first split by the polarizing beam splitter into an S-polarized light beam and a P-polarized light beam, and the first and second reflection type light beams are arranged in the separation direction. The light enters the light modulating means and is modulated according to the image information, and only predetermined color light is converted through the color filter layer in the direction in which the polarization axis is orthogonal to each other, or remains as it is in the polarization axis. Is reflected in a controlled state. The modulated light flux output from each reflection-type light modulating means is again incident on the polarizing beam splitter and synthesized, and then emitted toward the projecting means, and is enlarged and projected on the projection surface via the projecting means. .

When the reflection type light modulating means is used as described above, the polarization separating means and the light synthesizing means can be constituted by using a common optical element, so that the optical system can be simplified.

Next, the red light transmitting area, the green light transmitting area, and the blue light transmitting area may be assigned to each pixel forming the first light modulating means in a fixed pattern. Similarly, the cyan light transmitting area, the magenta light transmitting area, and the yellow light transmitting area may be allocated to each pixel constituting the second light modulating means in a fixed pattern.

[0025]

FIG. 1 shows a main configuration of an optical system of a two-panel projection display apparatus to which the present invention is applied.
Parts corresponding to the respective parts in FIGS. 7 to 9 are denoted by the same reference numerals.

As shown in FIG. 1, in the two-panel projection display device 100, light from the light source lamp 1 is reflected by the reflection mirror 2
, And is incident on the polarization beam splitter 3, which is a polarization splitting means, to be split into a P-polarized light beam and an S-polarized light beam. The P-polarized light beam enters the incident-side polarizing plate 52.
And enters a first liquid crystal panel 62 as first light modulating means having red (R), green (G) and blue (B) color filter layers. The first liquid crystal panel 62
An exit side polarizing plate 72 is attached to the exit surface in an optically close contact state, and modulates an incident P-polarized light beam based on given image information.

On the other hand, the S-polarized light beam passes through the incident side polarizing plate 51 via the mirror 4 and is provided with a second color filter layer having cyan (C), yellow (Y), and magenta (M) color filters. To the second liquid crystal panel 61 as a light modulating means. The second liquid crystal panel 61 has a configuration in which an emission-side polarizing plate 71 is stuck on the emission surface in an optically intimate contact state. Modulation is applied to the signal.

The modulated light beams emitted from the first and second liquid crystal panels 62 and 61 are combined into one modulated light beam by a polarization beam splitter 9 as a light combining means to form a combined image. This composite image is enlarged and projected on a projection surface 13 such as a screen via a projection lens optical system 10 as projection optical means. Note that the first liquid crystal panel 62 has S
The optical system may be configured so that the polarized light beam is incident and the P-polarized light beam is incident on the second liquid crystal panel 61 side. In addition, the incident side polarizing plates 51 and 52 are the polarizing beam splitter 3.
May be omitted as long as the polarization separation characteristics are good.

Next, referring to FIG. 2, the arrangement state of each color of the color filter layer in the first and second liquid crystal panels 62 and 61, and the two liquid crystal panels 6
The images synthesized by the images 1 and 62 will be described.

FIG. 2A shows the first liquid crystal panel 62 of the first type.
3 shows an arrangement state of each color in the color filter layer. The first color filter layer 620 includes a red light transmitting region R that transmits only red light, a green light transmitting region G that transmits only green light, and a blue light transmitting region B that transmits only blue light. The liquid crystal panel 62 is formed at a position corresponding to each pixel. In this example, regions R, G, and B are repeatedly formed in this order in the row direction of the pixel array. The arrangement form of the regions R, G, and B may be any arrangement form in which the appearance frequency and density of each region are substantially the same, and are not limited to the arrangement state of this example.

On the other hand, as shown in FIG.
Second color filter layer 610 of second liquid crystal panel 61
Are arranged at positions corresponding to the respective images of the second liquid crystal panel 61, a cyan light transmitting area C transmitting only cyan light, a magenta light transmitting area M transmitting only magenta light, and only yellow light. Is formed in a yellow light transmitting region Y that transmits light. Further, the arrangement of these areas C, M, and Y is also in a state where the areas C, M, and Y are repeated in this order in the row direction of the pixel array. In addition to this, the region R of the first color filter layer,
With respect to G and B, regions C, M and Y having a complementary color relationship are arranged at corresponding positions. That is, on the composite image obtained through the polarization beam splitter 9, the second liquid crystal panel 61 is irradiated with the red light that has passed through the first color filter layer region R of the first liquid crystal panel 62. In the second color filter layer, the irradiation area of the cyan light transmitted through the area C having the complementary color relationship is superposed. Similarly, on the composite image obtained through the polarizing beam splitter 9, the first liquid crystal panel 62
Magenta that has passed through the regions M and Y in the second color filter layer of the second liquid crystal panel 61 that are in a complementary color relationship to the irradiation regions of the green and blue lights that have passed through the regions G and B of the color filter layer. The arrangement is such that the irradiation areas of the yellow light beams overlap.

Therefore, the arrangement relationship between the respective regions R, G, and B of the first color filter layer shown in FIG. 2A indicates that the image obtained when all the pixels of the first liquid crystal panel 62 are in the display state. Similarly, the arrangement relationship between the respective regions C, M, and Y of the second color filter layer shown in FIG. 2B is such that all the pixels of the second liquid crystal panel 61 are in the display state. The resulting image is shown. As a result, a synthesized image obtained by synthesizing these images, that is, a synthesized image obtained via the polarizing beam splitter 9 is shown in FIG.
As shown in (C), in each of the pixel regions, color light having a complementary color relationship is superimposed, and all become white display regions W. Although FIG. 2 illustrates the mosaic type color arrangement, the present invention is not limited to this, and a stripe type, delta type, or other color arrangement may be used.

Next, the operation for performing color display will be described. For example, when displaying red, the pixels in the red light transmission region R of the first liquid crystal panel 62 are displayed, and the pixels in the yellow transmission region Y and the magenta transmission region M are displayed on the second liquid crystal panel 61 side. Let it. That is, in the case of the first and second liquid crystal panels 62 and 61 shown in FIG.
The unit pixels of the projected image are displayed by the three pixels arranged in the row direction. Therefore, as shown in FIG. 3C, when displaying red in the unit pixel U of the projection image, the first pixel corresponding to the unit pixel U is displayed as shown in FIG. Three pixel regions 6 in liquid crystal panel 62
Only the R region 62-1 in 2-1 to 62-3 is displayed. On the other hand, as shown in FIG. 3B, on the side of the three pixel regions 61-1 to 61-3 in the second liquid crystal panel 61 corresponding to the unit pixel U, the red component is Are displayed.

In the unit pixel U of the composite image of FIG. 3C obtained in this way, the relationship between the light amount and the wavelength of the unit is schematically represented by the graph of FIG. State. As shown in this graph, the light amount in the red wavelength band is the sum of the light amount passing through the region R of the first liquid crystal panel 62 and the light amount passing through the regions M and Y of the second liquid crystal panel 61. . Therefore, red display is performed with color purity that is three times the amount of luminance of the unit pixel U.

On the other hand, in the conventional two-panel type projection display apparatus shown in FIG. 9, the liquid crystal panel 67 is for color display, and the light quantity of each color obtained through this is one light source light quantity.
/ 6, and the amount of light obtained through the other liquid crystal panel 68 for ensuring luminance is の of the light source light amount. Therefore, for example, when red display is performed, the relationship between the overall luminance and color purity in the unit pixel U of the composite image is as shown in FIG. As can be seen by comparing the graphs of FIGS. 4A and 4B, the projection display device according to the present invention can display with high color purity although the overall brightness of the projected image is reduced.

Here, as described above, in the conventional two-panel projection display device, in order to secure color purity, the amount of light of a black-and-white image obtained through a luminance securing liquid crystal panel is reduced. In order to ensure the same level of color purity as the projection type display device according to the present invention, it is necessary to reduce the amount of light of a black-and-white image obtained through the luminance securing liquid crystal panel to at least 1/3 or less. The resulting composite image has extremely low luminance. However, according to the projection display device of the present invention, it is possible to form a bright projection image while ensuring color purity. In the above description, the display method on the first and second liquid crystal panels for the red display has been described. However, in the case of the green display, the pixel regions 62-2 and 61-
1 and 61-3 are displayed. In the case of blue display, the pixel area 61-3 and the pixel areas 61-1 and 61-2 are used.
The same effect can be obtained by displaying.

FIG. 5 is a graph showing the color reproduction range of the projection display device 100 according to the present invention. In this graph, a region P1 indicated by a broken line is a color reproduction range of the first liquid crystal panel including the RGB color filter layers. A region P2 indicated by a chain line is a color reproduction range of the second liquid crystal panel including the CMY color filter layers. A region (P1 + P2) indicated by a thick solid line is a color reproduction range when the maximum amount of light is obtained in a composite image formed by two liquid crystal panels. When the display of the maximum light quantity is performed, the color purity is reduced, but it is possible to display three times the brightness of the conventional single-panel projection display device. Also, CYM
By suppressing the amount of light of an image obtained by transmitting through the second liquid crystal panel having the color filter layer, high color purity can be obtained by the color image obtained through the first liquid crystal panel having the RGB color filter layer. A projection image can be obtained, and the brightness and the color purity can be arbitrarily adjusted as needed.

FIG. 6 is a schematic structural view showing an optical system of another embodiment of a two-panel projection display apparatus to which the present invention is applied. The example shown in this figure has a configuration in which a reflective liquid crystal panel is used as the first and second liquid crystal panels.
In the projection display device 200 of the present embodiment, light emitted from the light source lamp 1 is reflected by the reflection mirror 2 to become a parallel light beam W and enters the polarization beam splitter 3 functioning as polarization separation means. The polarization beam splitter 3 has a quadrangular prism shape made of a prism composite in which two prisms are bonded, and the bonding surface is a polarization separation film 30 made of a multilayer dielectric film. The parallel light beam W from the side of the light source lamp 1 enters the polarizing beam splitter 3 at a right angle from the outer surface 31, and only the P-polarized light is transmitted and the S-polarized light is reflected by the polarization splitting film 30. A first reflection type liquid crystal panel 62A is opposed to the outer surface 33 of the polarization beam splitter 3 on the P-polarized light transmission side. Further, a second reflection type liquid crystal panel 61A is opposed to the outer surface 32 of the polarization beam splitter 3 on the reflection side of the S-polarized light. Next, the operation will be described. In the following description of the operation, it is assumed that the liquid crystal of the reflective liquid crystal panel is in a vertically aligned state.

The first reflection type liquid crystal panel 62A is composed of RGB
And a total reflection mirror 62b disposed on the back of the liquid crystal cell 62a. Then, at the positions corresponding to the respective pixels of the liquid crystal cell, the transmission regions R, G, and B of the respective colors are formed in the same arrangement as described with reference to FIG. The polarization direction of the P-polarized light that has entered the first reflective liquid crystal panel 62A having this configuration is rotated by 45 degrees while passing through the pixel region in the driving state of the liquid crystal cell 62a. While being reflected and passing through the driven pixel region again, the polarization direction is rotated again by 45 degrees.
As a result, P incident on the first reflection type liquid crystal panel 62A.
The polarized light is emitted as S-polarized light from the first reflective liquid crystal panel 62A. On the other hand, when the light passes through the pixel region that is not in the driving state, the incident P-polarized light is emitted as it is as P-polarized light. Since the principle of the reflection type liquid crystal panel is known, the description thereof is omitted in this specification.

Similarly, second, the reflection type liquid crystal panel 61A
Is a liquid crystal cell 61a having a CMY color filter layer.
And a total reflection mirror 61b disposed on the back surface thereof. Then, at the positions corresponding to the respective pixels of the liquid crystal cell, the transmission regions C, M, and Y of the respective colors are formed in the same arrangement state as described with reference to FIG. The polarization direction of the S-polarized light incident on the second reflective liquid crystal panel 61A having this configuration is rotated by 45 degrees while passing through the pixel region in the driving state of the liquid crystal cell 61a. While being reflected and again passing through the same pixel region in the driven state, the polarization direction is again rotated by 45 degrees. As a result, the first reflective liquid crystal panel 61
The S-polarized light incident on A becomes P-polarized light and exits from the second reflective liquid crystal panel 61A. On the other hand, when the light passes through the pixel region that is not in the driving state, the incident S-polarized light is emitted as it is as S-polarized light.

The P-polarized light and the S-polarized light emitted from the liquid crystal panels 61A and 62A in this manner enter the polarization beam splitter 3 again, are combined through the polarization separation film 30, and are combined at the emission surface. The light is emitted from a certain side surface 34 as a combined image light beam. In other words, of the light beam emitted from the liquid crystal panel 62A, the S-polarized light component of each pixel region is reflected toward the projection lens system 10, and the P-polarized light component of each pixel region of the light beam emitted from the liquid crystal panel 62B is projected. Lens 1
Transmits to the 0 side. As a result, a composite image is formed by the components of the light emitted to the outer surface 34 of the polarizing beam splitter. Therefore, the polarization beam splitter 3 is a common optical element that functions as a polarization splitting unit and also functions as a light combining unit. The light emitted from the polarization beam splitter 3 is enlarged and projected on a projection surface 13 such as a screen via a projection optical system 10 as a projection unit.

As described above, the reflection type liquid crystal panel 2
In the plate-type projection display device 100, the same operation and effect as those of the above-described projection display device 100 can be obtained.
In addition, when a reflective liquid crystal panel is used,
Another advantage is that the optical system can be made compact and compact. The above-mentioned reflection type liquid crystal panel has a configuration in which a total reflection mirror is arranged on the back surface of the liquid crystal cell.
As the reflective liquid crystal panel, there is a reflective liquid crystal panel in which the pixel electrode itself is formed of a metal such as aluminum, and the incident light is reflected by the pixel electrode itself. The operation and effect can be obtained.

On the other hand, in each of the above embodiments, the liquid crystal panel controls the rotation angle of the polarization axis of the incident polarized light based on the image information, but in the present invention, the light modulating means is limited to this. Instead, various light valves such as a PLZT and a mirror type light valve can be used as the light modulating means.

[0044]

As described above, in the projection type display device of the present invention, the first light modulating means having the first color filter layer and the second light modulating means having the second color filter layer are provided. And a modulating unit, wherein the colors of the corresponding regions of the first and second color filter layers are set so as to have a complementary color relationship with each other. Therefore, by driving the corresponding areas of both light modulating means, white display in which complementary colors are superimposed can be performed. In addition, each color can be displayed using the color light flux obtained through both light modulating means. As described above, since the brightness and color purity of the projected image can be adjusted using both the light modulating means, the color purity is increased and a bright projected image is formed as compared with the conventional two-panel projection display device. can do.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an optical system of a two-panel projection display device to which the present invention is applied.

FIGS. 2A to 2C are explanatory views showing a color image formed by a first liquid crystal panel in the projection type display device of FIG. 1, and a color image formed by a second liquid crystal panel, respectively. And an explanatory diagram showing a composite image of these color images.

FIGS. 3A to 3C are explanatory views of a color image formed by three pixels of a first liquid crystal panel in the projection display device of FIG. 1, and correspond to a second liquid crystal panel, respectively. FIG. 3 is an explanatory diagram of a color image formed by three pixels and an explanatory diagram of a composite image of these color images.

4A is a graph conceptually showing a relationship between a light amount and a wavelength of a composite image obtained by the projection display device of FIG. 1, and FIG. 4B is a composite image obtained by a conventional two-panel projection display device; 4 is a graph conceptually showing a relationship between a light amount and a wavelength of an image.

FIG. 5 is a graph showing a color reproduction range of the projection display device of FIG.

FIG. 6 is a schematic configuration diagram showing an optical system of a projection display device including a reflective liquid crystal panel to which the present invention is applied.

FIG. 7 is a schematic configuration diagram showing an optical system of a conventional three-panel projection display device.

FIG. 8 is a schematic configuration diagram showing an optical system of a conventional single-panel projection display device.

FIG. 9 is a schematic configuration diagram showing an optical system of a conventional two-panel projection display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Light source lamp 2 Reflection mirror 3 Polarization beam splitter 4 Mirror 61 2nd liquid crystal panel 62 1st liquid crystal panel 61A 2nd reflection type liquid crystal panel 62A 1st reflection type liquid crystal panel 9 Polarization beam splitter 10 Projection lens optical system 13 Projection surface 100, 200 Projection type display device

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G02F 1/13 505 G02F 1/1335 G02F 1/1347

Claims (6)

(57) [Claims] A first light-transmitting region that modulates a first polarized light beam and that transmits a red light, a green light-transmitting region that transmits a green light, and a blue light-transmitting region that transmits a blue light; A first light modulating means having a color filter layer, a second polarized light flux having a polarization axis substantially orthogonal to a polarization axis of the first polarized light flux, and a cyan light transmission transmitting cyan light. A second light modulating means having a second color filter layer having an area, a magenta light transmitting area transmitting magenta light, and a yellow light transmitting area transmitting yellow light; and the first and second light modulations. Projection optical means for projecting a combined image obtained by combining modulated light fluxes emitted from the means, the red light transmitting area, the green light transmitting area, and the color light transmitted through each of the blue light transmitting area, These regions are formed in the first and second color filter layers so that the color light transmitted through each of the cyan light transmission region, the magenta light transmission region, and the yellow light transmission region overlaps on the composite image. A projection type display device characterized in that: 2. A light source according to claim 1, further comprising: a light source; polarization separating means for separating a light beam emitted from the light source into the first polarized light beam and the second polarized light beam; and the first and second light modulations. A light combining means for combining modulated light beams emitted from the means. 3. The projection display device according to claim 1, wherein the first and second light modulating means are transmission light modulating means. 4. The projection display according to claim 1, wherein said first and second light modulating means are reflection type light modulating means. 5. The polarization beam splitting means and the light combining means according to claim 4, wherein the polarization beam splitter is a common polarizing beam splitter made of a prism composite, and the light source and the light source are provided on four outer surfaces of the polarizing beam splitter, respectively. A projection-type display device, wherein first and second reflection-type light modulation means and the projection optical means are arranged to face each other. 6. The pixel according to claim 3, wherein the red light transmitting region, the green light transmitting region, and the blue light transmitting region are arranged with respect to each pixel of the first light modulating means. The cyan light transmitting area, the magenta light transmitting area, and the yellow light transmitting area are allocated in a fixed pattern to each pixel of the second light modulating means. Characteristic projection display device.