JP5066837B2 - Image display device - Google Patents

Description

  The present invention relates to an image display apparatus including a display device that modulates illumination light from a light source according to a display image, and an imaging lens system that forms an image of illumination light that has passed through the display device.

  Conventionally, a display device is illuminated with illumination light from a light source, the illumination light is modulated according to a display image by the display device, and the illumination light that has passed through the display device is imaged on a screen by an imaging lens system A projection-type image display device (projector) has been proposed. Various display devices such as LCD (transmission type), DLP, LCOS, and GLV are used as display devices in such an image display apparatus.

  In such an image display device, as described in Patent Document 1, illumination light is separated into red (R) band, green (G) band, and blue (B) band components by color separation means. Then, the illumination light of each color component is incident on each display device for red, green, and blue, and the illumination light that has passed through each display device is synthesized and projected by the color synthesis means, thereby displaying a color image. There is a proposal to do this.

  Conventionally, in such an image display device, not only red, green, and blue, but also these colors are further divided into first and second bands, and the first and second red bands, the first and first bands. There has been proposed a multi-primary color image display apparatus that displays an image using a total of six colors of two green bands and first and second blue bands.

  As shown in FIG. 9, the multi-primary color image display device has a configuration in which two normal image display devices are combined. Each of the first and second image display apparatuses 101 and 102 color-separates illumination light from a light source to illuminate three display devices, color-synthesizes illumination light that has passed through these display devices, and forms an image. An image is formed on a screen by a lens system.

  In this multi-primary color image display device, the image signal that has passed through the decoder 103 is sent to the six-color conversion device 106 via the output memory device 104 and the format converter 105. The output memory device 104 and the six-color conversion device 106 are controlled by the three primary color conversion workstation 108 and the multi-primary color conversion workstation 106.

  The first image display device 101 is based on signals sent from the output memory device 104 and the six-color conversion device 106, and is based on the three colors of the first red band, the first green band, and the first blue band. Display. Further, the second image display device 102 is based on signals sent from the output memory device 104 and the six-color conversion device 106, and the three colors of the second red band, the second green band, and the second blue band. The image is displayed by. The image displayed by the first image display device 101 and the image displayed by the second image display device 102 are superimposed on the screen 107.

  In such a multi-primary color image display device, the color reproduction range can be expanded as compared with the image display using the three primary colors, and blood colors, purple, ultramarine blue, etc. that cannot be expressed by the image display device using the three primary colors. It can be reproduced. For this reason, such a multi-primary color image display apparatus has begun to be used for displaying an image in which color reproduction is particularly important, such as an image display of a work of art such as paintings and ceramics, and an image display for medical use.

Japanese Patent No. 3596322

  By the way, in the conventional multi-primary color image display device as described above, two normal image display devices are prepared, predetermined signals are input to each image display device, and two images are displayed on the screen as pixels. It is necessary to synthesize in units.

  Therefore, in such a multi-primary color image display device, the device configuration becomes large, and installation and adjustment are difficult. Further, the two image display devices must have different color separation characteristics, and the dichroic coat mirror for performing color separation must have narrow band characteristics, so that the production is difficult and the production is difficult. High costs are incurred. Therefore, such a multi-primary color image display apparatus is realized only as part of research with the support of a public institution, and there are many obstacles to general dissemination.

  Further, in such a multi-primary color image display device, the images from the two image display devices are superimposed, so that the black level in each image overlaps to double the level and the contrast of the display image is a normal image. There is a problem that it is reduced to half of the display device. That is, there is a problem that black (actually gray) overlaps with the primary color reproduction, resulting in a whitish and cloudy color reproduction and a narrow reproduction range.

  That is, if a single image display device can be provided with a number of display devices corresponding to the number of primary colors for performing multi-primary color image display, the device configuration can be reduced in size, installed and adjusted, and manufactured. It should be possible to simplify and reduce manufacturing costs.

  Therefore, the present invention is proposed in view of the above-described circumstances, and the apparatus is provided with a number of display devices corresponding to the number of primary colors for performing multi-primary color image display on one image display device. The structure is miniaturized, installation and adjustment are facilitated, and the manufacturing is facilitated to reduce the manufacturing cost while realizing a wide color reproduction range corresponding to the human color recognition range, and An object of the present invention is to provide an image display device capable of displaying an image with a good contrast exceeding the dynamic range of human eyes (100,000: 1) without impairing the dynamic range of the image signal.

In order to solve the above-described problems and achieve the above object, an image display apparatus according to the present invention has any one of the following configurations.

[Configuration 1]
About a light source, color separation means for separating illumination light from the light source into red band, green band and blue band components, illumination light incident on the color separation means, or illumination light that has passed through the color separation means, Each of the red band, the green band, and the blue band is a first red band, a first green band, a first blue band, a second red band different from the first red band, and the first green band. At least one wavelength-selective filter for selecting and transmitting wavelengths in a time-division manner to a second green band different from the band and a second blue band different from the first blue band; and color separation means And the first red display device that receives the red-band illumination light that has passed through the wavelength-selective filter and modulates it in accordance with the first red-band component of the display image, and the first red display device. Red band modulated light is incident Is a second red display device which modulates in response to the second red band component of the displayed image, a green band illumination light passing through the color separation means and the wavelength selective filter in the display image incident The first green display device that modulates in accordance with the first green band component, and the second green band component of the display image upon receiving the green band modulated light that has passed through the first green display device. A second green display device that modulates in response to the light, a blue band illumination light that has passed through the color separation means and the wavelength selective filter, and is modulated in accordance with the second blue band component of the display image . One blue display device, and a second blue display device that is modulated by the blue band modulated light that has passed through the first blue display device and that is modulated in accordance with the second blue band component of the display image ; For the second red A color combining unit that combines the modulated light that has passed through the display device, the modulated light that has passed through the second green display device, and the modulated light that has passed through the second blue display device; And an image lens system.

[Configuration 2]
In the image display apparatus having the configuration 1, the image signal of the right eye image is input to the first red display device, the first green display device, and the first blue display device, and the second red display device receives image signals of the left-eye image on the second display device and the second blue display device for green, the image formed by the imaging lens system, the first band of the red band, green band wherein the first wavelength selective filter that transmits the first band of the band and the blue band of the second band of red band, the second band of the second band and the blue band of the green band A stereoscopic image is displayed by observing through eyeglasses composed of a wavelength selective filter that transmits light.

  In the image display device according to the present invention, color separation means for separating the illumination light from the light source into components of the red band, the green band, and the blue band, and the illumination light of each of these color bands are further divided into the first and second bands. A wavelength-selective filter that performs wavelength selection in a time-sharing manner, and the illumination light that has passed through these filters is supplied to the first and second red display devices, the first and second green display devices, and the first and second The image is displayed by being incident on a blue display device.

  Therefore, in this image display apparatus, since the six display devices display images of different color components, a wide color reproduction range corresponding to the human color recognition range can be achieved without increasing the size and complexity of the configuration. Can be realized. In this image display apparatus, since the illumination light having passed through the first display device of each color is incident on the second display device of each color, the black level does not increase and an image with good contrast is obtained. Display is possible.

  That is, the present invention includes a number of display devices corresponding to the number of primary colors for performing multi-primary color image display on one image display device, thereby reducing the size of the device configuration and facilitating installation and adjustment. In addition, while facilitating manufacturing and reducing the manufacturing cost, a wide color reproduction range equivalent to the human color recognition range can be realized, and the human eye can be seen without impairing the dynamic range of the image signal. Therefore, it is possible to provide an image display device capable of displaying an image with a good contrast exceeding the dynamic range (100,000: 1).

  In this image display device, the image signal for the right eye is input to the first display device for each color, the image signal for the left eye image is input to the second display device for each color, and image display is performed. A stereoscopic image can be easily displayed by observing the image through glasses comprising a wavelength selective filter that transmits the first band of each color and a wavelength selective filter that transmits the second band of each color. be able to.

  Also in this case, a wide color reproduction range corresponding to the human color recognition range can be obtained, and an image display with a good contrast exceeding the dynamic range of human eyes (100,000: 1) can be performed.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

[First Embodiment]
FIG. 1 is a plan view showing the configuration of the image display apparatus according to the first embodiment of the present invention.

  In this embodiment, the image display apparatus according to the present invention is configured by using an LCOS device (Liquid Crystal on Silicon) as a display device. In this image display apparatus, the display device is not limited to the LCOS device, and various display devices can be used.

  This image display apparatus has a light source 1 as shown in FIG. As the light source 1, an ultra-high pressure mercury lamp (UHP lamp), a xenon lamp, a laser light source, an LED light source, or the like can be used. The light source 1 is attached to a lamp house 1a having a concave mirror.

  The illumination light emitted from the light source 1 and reflected by the concave mirror of the lamp house 1 a is emitted from the lamp house 1 a, passes through the UV / IR filter 2, and enters the integrator 3. The UV / IR filter 2 is a filter that absorbs and blocks ultraviolet rays and infrared rays, and is provided to prevent subsequent deterioration of optical components due to heat and ultraviolet rays. The integrator 3 makes the illuminance distribution of the illumination light uniform, and a fly eye integrator may be used in addition to the rod integrator shown in FIG. The UV / IR filter 2 may be arranged separately before and after the integrator 3. The illumination light that has passed through the integrator 3 is incident on the rotary wavelength selective filter 4.

  FIG. 2 is a front view showing the configuration of the wavelength selective filter.

  As shown in FIG. 2, the wavelength selective filter 4 is formed in a circular shape, is rotatably supported at the center, and is rotated in synchronization with a vertical period of an image displayed by the image display device. The wavelength selective filter 4 is divided into first and second regions 4a and 4b each having an angle range of approximately 180 °, and each of the regions 4a and 4b has different wavelength selection characteristics.

  FIG. 3 is a graph showing the spectral transmission characteristics of the wavelength selective filter.

  As shown in FIG. 3, the first region 4 a includes a first red band (for example, 615 nm), a first green band (for example, 515 nm), and a first blue band, as shown in FIG. 3. One band (for example, 450 nm) is transmitted. The second region 4b includes a second band (for example, 650 nm) of a red band, a second band (for example, 550 nm) of a green band, and a second band (for example, of a blue band) of incident illumination light. 475 nm). That is, the wavelength selective filter 4 is rotated to select and transmit the red band, the green band, and the blue band of the illumination light to the first band and the second band in a time division manner. It will be. As such a wavelength selective filter 4, for example, “Infitec” (trade name) can be used.

  As shown in FIG. 1, the illumination light that has passed through the wavelength selective filter 4 is incident on a G / RB dichroic mirror 7 that serves as color separation means, via a mirror 5 and a field lens 6. The wavelength selective filter 4 may be disposed at a position where the illumination light having passed through the field lens 6 is incident, and the position at which the illumination light having passed through the integrator 3 is incident and the illumination light having passed through the field lens 6 are arranged. You may arrange | position at both the incident positions.

  The G / RB dichroic mirror 7 separates the incident illumination light into G light (green band component), R light (red band component) and B light (blue band component), and reflects the G light. R light and B light are transmitted. Illumination light in which R light and B light are mixed is M light (magenta light).

  FIG. 4 is a side view showing the configuration of the image display apparatus according to the first embodiment of the present invention.

  As shown in FIG. 4, the G light reflected by the G / RB dichroic mirror 7 is deflected to the lower side of the apparatus and enters the first G wire grid 8a inclined at 45 °. Is done. The first G wire grid 8a transmits the P-polarized light of the G light. The P-polarized G light transmitted through the first G wire grid 8a passes through a retarder (λ / 4 plate) 9a adapted to the wavelength of the G light, and then the first G device which is the first green display device. 10a. The first G device 10a is an LCOS device. The first G device 10a performs polarization modulation on the G light according to the first band component of the green band in the display image. The G light incident on the first G device 10a is reflected by the first G device 10a and returns to the first G wire grid 8a. The component (modulated light) modulated into S-polarized light in the first G device 10a is reflected by the first G wire grid 8a, is deflected upward by the mirror 12 via the relay lens 11, and is 45 °. The light enters the inclined second G wire grid 8b. The second G wire grid 8b reflects S-polarized light in the G light. Here, the G light is substantially only the S-polarized component because it passes through the first G wire grid 8a.

  The S-polarized G light reflected by the second G wire grid 8b passes through a retarder (λ / 4 plate) 9b adapted to the wavelength of the G light and passes through the second G display device which is the second green display device. Incident on the device 10b. The second G device 10b is an LCOS device. The second G device 10b polarization-modulates the G light according to the second band component of the green band in the display image. The G light incident on the second G device 10b is reflected by the second G device 10b and returns to the second G wire grid 8b. The component modulated into P-polarized light in the second G device 10b passes through the second G wire grid 8b and enters the RGB dichroic prism 13 from the rear surface.

  On the other hand, the C light transmitted through the G / RB dichroic mirror 7 is incident on an R / B cross dichroic mirror 14 serving as color separation means, as shown in FIG. The R / B cross dichroic mirror 14 separates the incident illumination light into R light (red band component) and B light (blue band component), and deflects them by 90 ° and emits them in opposite directions.

  The R light having passed through the R / B cross dichroic mirror 14 is incident on the first R wire grid 15a inclined at 45 °. The first R wire grid 15a transmits the P-polarized light of the R light. The P-polarized R light transmitted through the first R wire grid 15a passes through a retarder (λ / 4 plate) 16a adapted to the wavelength of the R light, and is a first R device which is a first red display device. It is incident on 17a. The first R device 17a is an LCOS device. The first R device 17a polarization-modulates the R light according to the first band component of the red band in the display image. The R light incident on the first R device 17a is reflected by the first R device 17a and returns to the first R wire grid 15a. The component (modulated light) modulated into S-polarized light in the first R device 17a is reflected by the first R wire grid 15a, passes through the relay lens 18 and the field lens 19, and is inclined at 45 °. Is incident on the R wire grid 15b. The second R wire grid 15b reflects S-polarized light in the R light. Here, since the R light has passed through the first R wire grid 15a, it has almost only the S polarization component.

  The S-polarized R light reflected by the second R wire grid 15b passes through a retarder (λ / 4 plate) 16b adapted to the wavelength of the R light and passes through a second R display device that is a second red display device. Incident on the device 17b. The second R device 17b is an LCOS device. The second R device 17b performs polarization modulation on the R light according to the second band component of the red band in the display image. The R light incident on the second R device 17b is reflected by the second R device 17b and returns to the second R wire grid 15b. The component modulated into P-polarized light in the second R device 17b passes through the second R wire grid 15b and enters the RGB dichroic prism 13 from one side.

  The B light that has passed through the R / B cross dichroic mirror 14 is incident on the first B wire grid 20a inclined at 45 °. The first B wire grid 20a transmits P-polarized light out of B light. The P-polarized B light transmitted through the first B wire grid 20a passes through a retarder (λ / 4 plate) 21a adapted to the wavelength of the B light, and is a first B device that is a first blue display device. Incident on 22a. The first B device 22a is an LCOS device. The first B device 22a performs polarization modulation on the B light according to the first band component of the blue band in the display image. The B light incident on the first B device 22a is reflected by the first B device 22a and returns to the first B wire grid 20a. The component (modulated light) modulated into S-polarized light in the first B device 22a is reflected by the first B wire grid 20a, passes through the relay lens 23 and the field lens 24, and is inclined at 45 °. Is incident on the B wire grid 20b. The second B wire grid 20b reflects S-polarized light in the B light. In this case, the B light is substantially only the S-polarized component because it passes through the first B wire grid 20a.

  The S-polarized B light reflected by the second B wire grid 20b passes through a retarder (λ / 4 plate) 21b adapted to the wavelength of the B light and passes through a second B display device that is a second blue display device. It enters the device 22b. The second B device 22b is an LCOS device. The second B device 22b polarization-modulates the B light according to the second band component of the blue band in the display image. The B light incident on the second B device 22b is reflected by the second B device 22b and returns to the second B wire grid 20b. The component modulated into P-polarized light in the second B device 22b passes through the second B wire grid 20b and enters the RGB dichroic prism 13 from the other side surface.

  The R light, G light, and B light incident on the RGB dichroic prism 13 from three directions are color-combined, emitted to the front of the RGB dichroic prism 13, and incident on the projection lens 25 serving as an imaging lens system. . It is to be noted that an aberration that occurs between the RGB dichroic prism 13 and the projection lens 25 when passing through the second G wire grid 8b, the second R wire grid 15b, and the second B wire grid 20b. A wedge glass 28 for correction and an analyzer (wire grid) 29 for ensuring the contrast of the display image are inserted. The outgoing light from the RGB dichroic prism 13 passes through the wedge glass 28 and the analyzer 29 and enters the projection lens 25. The projection lens 25 projects incident illumination light onto a screen (not shown) and forms an image.

In this image display apparatus, image signals corresponding to light of six primary colors separated by the wavelength selective filter 4, the G / RB dichroic mirror 7, and the R / B cross dichroic mirror 14 are displayed on the display devices 10a, 10b, 17a. , 17b, 22a, 22b. After the illumination light from the light source 1 is color-separated, the first band and the second band of the R light are modulated by the two R devices 17a and 17b, and the first band and the second band of the G light are modulated. The band is modulated by the two second G devices 10a and 10b, and the first band and the second band of the B light are modulated by the two B devices 22a and 22b. Therefore, in this image display apparatus, only the black display portion can be displayed in the same frame as in the state where the light source light is reduced. That is, as shown in the following equation, the contrast (Total-Cont.) Of the display image is the contrast (RGBDevice-Cont.) By each display device 10a, 17a, 22a and each corresponding display device 10b, 17b, 22b. This is a value obtained by multiplying the contrast (R′G′B′Device-Cont.) By.
[Total-Cont.] = [RGBDevice-Cont.] × [R′G′B′Device-Cont]

For example, when the contrast by each display device 10a, 17a, 22a is 1000: 1 and the contrast by each corresponding display device 10b, 17b, 22b is also 1000: 1, the improvement of the contrast of a display image is as follows. As shown in FIG.
[1000: 1] × [1000: 1] = [1000000: 1]

  Thus, in this image display device, it is possible to display an image having a contrast exceeding 100,000: 1, which is the dynamic range (contrast range) of the human eye.

  In this image display device, since the image display is performed using the six primary colors separated by the wavelength selective filter 4, the G / RB dichroic mirror 7, and the R / B cross dichroic mirror 14, on the chromaticity diagram, All of the inner colors connecting these coordinate points can be reproduced.

  FIG. 5 is a chromaticity diagram showing a color reproduction range reproduced in the image display apparatus according to the present invention.

  That is, in the image display device according to the present invention, as shown in FIG. 5, a blue band first band (for example, 450 nm), a blue band second band (for example, 475 nm), and a green band first band (for example, 450 nm). For example, 515 nm), the second band of the green band (for example, 550 nm), the first band of the red band (for example, 615 nm), and the color of the range surrounded by the second band of the red band (for example, 650 nm) can be reproduced It is. In FIG. 5, a region surrounded by a dotted line is a color reproduction range defined by “Digital Cinema” (DCI spec). The color reproduction range in the image display device according to the present invention is sufficiently wider than the color reproduction range defined by this DCI specification, and the primary color is not mixed with black (gray). It covers almost all the color range (the range of the horseshoe chart) that the eyes feel.

[Description of driving of each device]
In the image display device described above, the drive of each display device 10a, 10b, 17a, 17b, 22a, 22b ensures the γ characteristics and gradation accuracy (Bit accuracy) required for the original image signal in the display image. It is preferable to do so.

Therefore, the optical modulation degree in each display device 10a, 10b, 17a, 17b, 22a, 22b is set to Gf (t), Rf (t), Bf (t), G′f (t), R′f (t), Assuming that B′f (t), the RGB color lights projected on the screen are modulated by the second display devices 10b, 17b, and 22b corresponding to the light modulation degrees of the first display devices 10a, 17a, and 22a. Multiply by degrees. That is, the output R of red light, the output G of green light, and the output B of blue light projected on the screen are expressed by the following equations.
[Output R] = Rf (t) · R′f (t)
[Output G] = Gf (t) · G′f (t)
[Output B] = Bf (t) · B′f (t)

  When a display device having a linear Vt characteristic (Voltage Transmission: also referred to as an S-shaped curve) such as a DLP device other than the liquid crystal display device is used, the same expression is used for each of the RGB colors. Therefore, the second display devices 10b, 17b, and 22b corresponding to the first display devices 10a, 17a, and 22a may be driven in substantially the same manner as the first display devices 10a, 17a, and 22a.

  The number of bits (Bit) of the input signal is also Rf (t) and R′f (t), Gf (t) and G′f (t), Bf (t) and B′f (t), respectively. Therefore, when using a normal 8-bit signal (for example, DVI output on a personal computer), Rf (t) is divided into 4 bits and R'f (t) is divided into 4 bits. (The same applies to G light and B light). When a 10-bit signal is used, it can be divided into 5 bits at a time, and when a 16-bit signal is used, it can be divided into 8 bits. Even if the bit accuracy of the output circuit that drives each device is low, a high bit Accuracy, that is, high gradation can be realized. That is, when each device is driven by an 8-bit D / A output signal, 16-bit gradation can be expressed for each color, and an image having high gradation can be displayed.

  When LCOS is used as a display device, the Vt characteristic differs depending on the wavelength of each RGB color light, and the level of the liquid crystal drive voltage required for rotating the liquid crystal molecules to perform light modulation is different for each color. Different. Therefore, the output of each RGB color light modulated by each first display device 10a, 17a, 22a and each corresponding second display device 10b, 17b, 22b is reversed so as to match the γ characteristic of the input signal. It is preferable to perform correction including γ and S-curve correction of each device.

  FIG. 6 is a functional block diagram for driving the display device of the image display apparatus according to the present invention.

  In this image display apparatus, in order to drive the first display devices 10a, 17a, and 22a for RGB and the corresponding second display devices 10b, 17b, and 22b, as shown in FIG. Based on the drive signal, the drive signals of the display devices 10a, 17a, 22a, 10b, 17b, and 22b are generated.

  That is, in the block diagram shown in FIG. 6, the R optical input signal is input to the input block 31. The input block 31 sends the input HDTV signal or computer signal as a LVDS signal for the digital circuit at the subsequent stage, with the bits aligned.

  Next, the signal that has passed through the input block 31 is sent to the inverse γ block 32. The inverse γ block 32 temporarily applies inverse γ to a signal that has been multiplied by the power of 2.2, such as an HD input signal, in the subsequent blocks, and returns the signal to linear gamma.

  The signal that has passed through the inverse γ block 32 is sent to the image processing block 33. The image processing block 33 performs various image processing on the signal returned to the linear signal by the inverse γ block 32. That is, in the image processing block 33, processing such as CGP (Computer Graphics Processor), rendering, and CP (Color Processor) is performed.

  The signal that has passed through the image processing block 33 is sent to the RVt block 34. The RVt block 34 reversely corrects the Vt characteristic that is different for each display device for each color of RGB using a lookup table.

  The signal that has passed through the RVt block 34 is sent to R-Shading 35. The R-shading 35 is a block that corrects in-plane unevenness inherent to the R device.

  The signal that has passed through the R-shading 35 is sent to the R drive D / A converter 36. The R drive D / A converter 36 receives the signal corrected according to the display device by the R-shading 35 and converts it into a drive signal necessary for driving the display device. The R drive D / A converter 36 directly supplies a drive voltage necessary for driving the first R device.

  The drive voltage from the R drive D / A converter 36 is supplied to the first R device 17a. In the first R device 17a, a drive voltage is applied to the liquid crystal cell to modulate illumination light from the light source.

  Similarly, the G light input signal is input to the input block 41, and sent to the GVt block 44 through the inverse γ block 42 and the image processing block 43. A signal passing through the GVt block 44 is converted into a drive signal necessary for driving the display device via a G-shading 45 and a G drive D / A converter 46. The G drive D / A converter 46 directly supplies a drive voltage necessary for driving the first G device.

  The drive voltage from the G drive D / A converter 46 is supplied to the first G device 10a. In the first G device 10a, a drive voltage is applied to the liquid crystal cell to modulate illumination light from the light source.

  Similarly, the B light input signal is input to the input block 51 and is sent to the BVt block 54 via the inverse γ block 52 and the image processing block 53. The signal passing through the BVt block 54 is converted into a drive signal necessary for driving the display device via a B-shading 55 and a B drive D / A converter 56. The B drive D / A converter 56 directly supplies a drive voltage necessary for driving the first B device.

  The drive voltage from the B drive D / A converter 56 is supplied to the first B device 22a. In the first B device 22a, a drive voltage is applied to the liquid crystal cell to modulate illumination light from the light source.

  The output signal from the image processing block 33 is also sent to the R′Vt block 64. The signal that has passed through the R′Vt block 64 is sent to an R′-Shading 65. The R′-shading 65 is a block that corrects in-plane unevenness inherent to the device.

  The signal that has passed through the R′-shading 65 is sent to the R ′ drive D / A converter 66. The R ′ drive D / A converter 66 receives the signal corrected in accordance with the display device by the R′-shading 65 and converts it into a drive signal necessary for driving the second R device. The R ′ drive D / A converter 66 directly supplies a drive voltage necessary for driving the second R device 17b.

  The drive voltage from the R ′ drive D / A converter 66 is supplied to the second R device 17b. In the second R device 17b, a drive voltage is applied to the liquid crystal cell to modulate illumination light from the light source.

  The output signal from the image processing block 43 is also sent to the G′Vt block 74. The signal that has passed through the G′Vt block 74 is sent to a G′-Shading 75. The G′-shading 75 is a block that corrects in-plane unevenness inherent to the device.

  The signal that has passed through the G′-shading 75 is sent to the G ′ drive D / A converter 76. The G ′ drive D / A converter 76 receives the signal corrected in accordance with the display device by the G′-shading 75 and converts it into a drive signal necessary for driving the second G device. The G ′ drive D / A converter 76 directly supplies a drive voltage necessary for driving the second G device 10b.

  The drive voltage from the G ′ drive D / A converter 76 is supplied to the second G device 10b. In the second G device 10b, a drive voltage is applied to the liquid crystal cell to modulate illumination light from the light source.

  Further, the output signal from the image processing block 53 is also sent to the B′Vt block 84. The signal that has passed through the B′Vt block 84 is sent to a B′-Shading 85. The B′-shading 85 is a block that corrects in-plane unevenness inherent to the device.

  The signal that has passed through the B′-shading 85 is sent to the B ′ drive D / A converter 86. The B ′ drive D / A converter 86 receives the signal corrected in accordance with the display device by the B′-shading 85 and converts it into a drive signal necessary for driving the second B device. The B ′ drive D / A converter 86 directly supplies a drive voltage necessary for driving the second B device 22b.

  The drive voltage from the B ′ drive D / A converter 86 is supplied to the second B device 22b. In the second B device 22b, a drive voltage is applied to the liquid crystal cell to modulate illumination light from the light source.

  Then, the synchronization signal from the G drive D / A converter 46 is sent to the filter drive circuit 87. The filter drive circuit 87 controls the drive motor 88 to rotate the wavelength selective filter 4 in synchronization with the vertical period of the image signal. The reason why the synchronization signal for controlling the rotation of the wavelength selective filter 4 is obtained from the G drive D / A converter 46 is to synchronize with the vertical period of device drive. Further, it is preferable that the wavelength selective filter 4 is accurately rotated by detecting the rotational speed of the wavelength selective filter 4 and performing feedback control.

  FIG. 7 is a graph showing the timing relationship between the device drive signal and the rotation of the wavelength selective filter.

  The drive signal of each display device 10a, 10b, 17a, 17b, 22a, 22b and the rotation timing relationship of the wavelength selective filter 4 illuminate the first region 4a of the wavelength selective filter 4 as shown in FIG. The time when light is transmitted corresponds to the display period of the first display devices 10a, 17a, and 22a for each color of RGB, and the time when the illumination light is transmitted through the second region 4b is the second time for each color of RGB. This corresponds to the display period of the display devices 10b, 17b, and 22b.

  In the image signals supplied to the display devices, the waveforms 2A + and 2A− in FIG. 7 correspond to the first display devices 10a, 17a and 22a, and the waveforms 2B + and 2B− in FIG. This corresponds to the display devices 10b, 17b, and 22b. The reason why the positive and negative values are set in each waveform is that each display device is driven at field double speed. By driving each display device in this manner, light of six primary colors is alternately projected through the first region 4a and the second region 4b of the wavelength selective filter 4 during one frame period. Thus, an image with a wide color reproduction as described above can be displayed.

[Second Embodiment]
FIG. 8 is a plan view showing the configuration of the image display apparatus according to the second embodiment of the present invention.

  In the image display apparatus according to the present invention, the image signal of the right eye image is input to the first display devices 10a, 17a, and 22a for each color of RGB in the above-described configuration, and the second display device 10b for each color of RGB. , 17b, 22b, the stereoscopic image can be displayed by inputting the image signal of the image for the left eye.

  In this case, as shown in FIG. 8, the image formed on the screen 26 by the projection lens 25 is observed through the glasses 27 having the same spectral transmission characteristics as the wavelength selective filter 4 described above. . The right eye part of the glasses 27 has the same characteristics as the first region 4a of the wavelength selective filter 4, that is, the first band of the red band, the first band of the green band, and the first band of the blue band. Permeate. The left eye part of the glasses 27 has the same characteristics as the second region 4b of the wavelength selective filter 4, that is, the second band of the red band, the second band of the green band, and the second band of the blue band. Two bands are transmitted.

  Also in this case, a wide color reproduction range corresponding to the human color recognition range can be obtained, and an image display with a good contrast exceeding the dynamic range of human eyes (100,000: 1) can be performed. Further, in this image display device, it is possible to perform a stereoscopic image display with a very low ratio of crosstalk (complete extinction ratio) entering the left and right eyes.

It is a top view which shows the structure in 1st Embodiment of the image display apparatus which concerns on this invention. It is a front view which shows the structure of the wavelength selective filter in the image display apparatus which concerns on this invention. It is a graph which shows the spectral transmission characteristic of the wavelength selective filter in the image display apparatus which concerns on this invention. 1 is a side view showing a configuration in a first embodiment of an image display device according to the present invention. It is a chromaticity diagram showing a color reproduction range reproduced in the image display device according to the present invention. It is a functional block diagram for driving the display device of the image display apparatus according to the present invention. It is a graph which shows the timing relationship of the rotation of the device drive signal and wavelength selective filter in the image display apparatus which concerns on this invention. It is a top view which shows the structure of the image display apparatus in the 2nd Embodiment of this invention. It is a top view which shows the structure of the conventional image display apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light source 4 Wavelength selective filter 7 G / RB dichroic mirror 10a 1st G device 10b 2nd G device 13 RGB dichroic prism 14 R / B cross dichroic mirror 17a 1st R device 17b 2nd R device 22a 1st 1 B device 22b 2nd B device 25 Projection lens 26 Screen 27 Glasses

Claims (2)

A light source;
Color separation means for separating illumination light from the light source into red band, green band and blue band components;
With respect to the illumination light incident on the color separation means or the illumination light that has passed through the color separation means, the red band, the green band, and the blue band are changed to the first red band, the first green band, and the first blue band, respectively . A second red band different from the first red band, a second green band different from the first green band, and a second blue band different from the first blue band; At least one wavelength-selective filter that transmits light by wavelength selection in a time division manner;
A first red display device that receives the red band illumination light that has passed through the color separation means and the wavelength selective filter, and modulates the first red band display device according to the first red band component of the display image ;
A second red display device that receives the modulated light in the red band that has passed through the first red display device and modulates it in accordance with the second red band component of the display image ;
A first green display device that receives green band illumination light that has passed through the color separation unit and the wavelength selective filter, and modulates the first green display device according to the first green band component of the display image ;
A second green display device that receives the modulated light in the green band that has passed through the first green display device and modulates it in accordance with the second green band component of the display image ;
A first blue display device that receives blue band illumination light that has passed through the color separation means and the wavelength selective filter, and modulates the first blue display device according to the second blue band component of the display image ;
A second blue display device that receives the modulated light in the blue band that has passed through the first blue display device and modulates the light in accordance with the second blue band component of the display image ;
Color combining means for combining the modulated light that has passed through the second red display device, the modulated light that has passed through the second green display device, and the modulated light that has passed through the second blue display device;
An imaging lens system for imaging the modulated light that has passed through the color synthesis means;
An image display device comprising: An image signal of a right eye image is input to the first red display device, the first green display device, and the first blue display device,
Input an image signal of a left-eye image to the second red display device, the second green display device, and the second blue display device,
Wherein the image formed by the imaging lens system, and a wavelength selective filter that transmits the first band of the red band, the first band of the first band and the blue band of the green band, red band performing band, by observing it through glasses comprising a wavelength selective filter that transmits the second band of the second band and the blue band of the green band, the display of stereoscopic images of the second The image display device according to claim 1.

Images