JP2005189472A - Display unit and lighting device thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small-sized display unit having fewer spacial modulation elements, which is simply and compactly capable of constituting a composition and projection means, and which does not need to make the components of any one of the primary colors attenuated. <P>SOLUTION: An LED drive circuit (R/B) 24RB switches between a red LED 10R and a blue LED 10B, makes them emit light sequentially and in a time-series manner during a period of one image display, and illuminates an LCD 16RB for red/blue display via light guide rods 12R and 12B for illumination, and a dichroic prism 14. An LCD drive circuit 26 makes the LCD 16RB for red/blue display synchronized with the change in color of the illumination light, display the image data corresponding to the color of the illumination light, and modulate the illumination light sequentially in a time-series. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a display device for projecting and displaying an image and an illumination device used therefor.

  As a display device for projecting and displaying an image, white light is decomposed into three primary color components, and each light is modulated in accordance with image data by a corresponding spatial modulation element such as a liquid crystal panel (LCD), and then a color synthesis prism. A projector that displays a color image by projecting an image of a spatial modulation element by synthesizing the image again is generally used.

An apparatus that displays a color image by using two spatial modulation elements has also been proposed (see, for example, Patent Documents 1 and 2). These apparatuses disclosed in Patent Documents 1 and 2 use an optical writing type spatial modulation element capable of writing image information with weak writing light and modulating strong reading light. Image information is written into the two light writing type spatial modulation elements while scanning two oscillating mirrors of the two writing lights intensity-modulated in accordance with the image signals of the primary color images having complementary colors. On the other hand, as the readout light, the light from the white light source is decomposed into a primary color component and a complementary color component, and one light writing type spatial modulation element is continuously irradiated with the primary color component and another light writing type spatial modulation. A color image is displayed by decomposing complementary color components into two primary color components in time and irradiating them in a time-division manner, and combining and projecting the two lights modulated by the light-writing spatial modulator. ing.
JP-A-7-92444 JP-A-7-95604

  In a conventional general apparatus, white light from a white light source such as a discharge lamp is once decomposed into color components, and the corresponding spatial modulation elements are illuminated, so an optical system that decomposes white light into color components In addition, an optical system for illuminating each spatial modulation element is necessary, and it is difficult to reduce the size of the apparatus.

  Similarly, the devices disclosed in Patent Documents 1 and 2 also require an optical system that separates white light into color components, making it difficult to reduce the size of the device. Furthermore, in the devices disclosed in these Patent Documents 1 and 2, the light from the white light source is decomposed into one primary color component that is temporally continuous and two primary color components that are intermittent in time. In the latter case, the time average light quantity of the two intermittent primary color components is reduced, and even if the three primary color components are recombined, the original white light is not obtained. It is necessary to attenuate one continuous primary color component.

  The present invention has been made in view of the above points, and it is an object of the present invention to provide a small display device and an illumination device used therefor without the need to attenuate one primary color component.

  One aspect of the display device of the present invention is a display device that displays an image corresponding to input image data. The display device displays a plurality of illumination units that emit illumination light, and is disposed corresponding to the plurality of illumination units. A plurality of spatial modulation elements that modulate the illumination light according to the image data and emit modulated light, and a composite projection unit that synthesizes and projects the modulated light from the plurality of spatial modulation elements, At least one of the plurality of illumination units is a sequential illumination unit that sequentially switches light of a plurality of colors in time series and emits the light as illumination light, and among the plurality of spatial modulation elements, the sequential illumination unit includes The corresponding spatial modulation element sequentially modulates the illumination light in time series according to the image data corresponding to the color of the illumination light in synchronization with the change in the color of the illumination light from the sequential illumination means. .

  According to another aspect of the illumination device of the present invention, a first illumination unit that emits a first color illumination light, a second illumination unit that emits a second color illumination light, and the first illumination unit described above. A first prism that synthesizes the illumination light of the first color emitted by the illumination means and the illumination light of the second color emitted by the second illumination means; Each of the illuminating means includes a light source and a light guiding means that guides light from the light source incident from the incident end, converts the light spread angle to be small, and emits the light from the exit end. Each light guide means has a second direction that is perpendicular to the traveling direction of the light emitted from the light emitting end and perpendicular to each other. The divergence angle is converted so that the light divergence angle in the direction becomes smaller, and Wherein the incident surface and the said second direction are disposed parallel relative to Narumen.

  According to the present invention, illumination lights of different emission colors are sequentially modulated in time series by a common spatial modulation element, so that the number of spatial modulation elements of the display device can be reduced and the composite projection means can be made simple and compact. It is possible to provide a small-sized display device and a lighting device used therefor that can be configured and do not need to attenuate one primary color component.

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

[First Embodiment]
FIG. 1 is a diagram showing a configuration of a display device according to the first embodiment of the present invention.

  This display device has three types of LEDs, a red LED 10R, a green LED 10G, and a blue LED 10B, as light sources.

  Here, the light emitted from the red LED 10R is incident on the first incident end of the dichroic prism 14 by the corresponding light-tight illumination light guide rod 12R, and the light emitted from the blue LED 10B corresponds to the light. The light is incident on the second incident end of the dichroic prism 14 by the light guide rod 12B for illumination. The dichroic prism 14 transmits light having a wavelength corresponding to the red light incident on the first incident end and reflects light having a wavelength corresponding to the blue light incident from the second incident end. It has become. Accordingly, red light and blue light are emitted from the emission end of the dichroic prism 14 as illumination light. A red / blue display LCD 16RB, which is a spatial modulation element, is disposed in front of the exit end of the dichroic prism 14, and the red / blue display LCD 16RB is illuminated from the exit end of the dichroic prism 14. The light is modulated and incident on the first incident end of the combining prism 18.

  On the other hand, the green light emitted from the green LED 10G is guided by the corresponding medium-density illumination light guide rod 12G, and the green light is emitted as illumination light from the emission end of the illumination light guide rod 12G. A green display LCD 16G, which is a spatial modulation element, is arranged on the front surface of the light emitting rod 12G for illumination. The green display LCD 16G is emitted from the light emitting end of the light guiding rod 12G. The illuminated illumination light is modulated and incident on the second incident end of the combining prism 18.

  The combining prism 18 reflects the modulated red light and blue light wavelengths incident on the first incident end, and transmits the modulated green light wavelength light incident on the second incident end. The resulting dichroic film 20 is synthesized, and as a result, they are synthesized and emitted from the emission end. A projection lens 22 is disposed in front of the emission end. The projection lens 22 can project the modulated combined light emitted from the combining prism 18 onto a screen (not shown) as projection light. .

  The red LED 10R and the blue LED 10B are driven by an LED drive circuit (R / B) 24RB, and the green LED 10G is driven by an LED drive circuit (G) 24G. The red / blue display LCD 16RB and the green display LCD 16G are driven by an LCD drive circuit 26. The LED driving circuit (R / B) 24RB, the LED driving circuit (G) 24G, and the LCD driving circuit 26 are controlled by a signal processing circuit 28 in accordance with input image data.

  The illumination light guide rods 12 (12R, 12G, 12B) and the composite prism 18 are configured as shown in FIG. 2 (in practice, the illumination light guide rods 12R and 12B are dichroic prisms 14). Is the same in principle).

  That is, the light from the LED is isotropic diffused light having a large luminous flux angle (NA), and therefore, the incident end 30 of the light guide rod 12 for illumination has a square shape substantially the same size as the light emitting surface of the LED. have. Further, the output end 32 has a rectangular shape that is almost the same size as the LCD 16 (16RB, 16G) (therefore, the incident end and the output end of the dichroic prism 14 have the same rectangular shape). ). By having such a shape, in the light guide rod 12 for illumination, NA is converted in the process in which the light incident on the incident end 30 is guided toward the output end 32 while being totally reflected by the four inner wall surfaces thereof. Thus, the light emitted from the emission end 32 is light having a smaller NA than that at the time of incidence. However, since the shape of the emission end 32 is a rectangle, the NA in the major axis direction of the rectangle is smaller than that in the minor axis direction.

  Such NA-converted light is modulated when transmitted through the LCD 16 (for example, the green display LCD 16G) and then combined with the modulated light from the other LCD 16 (for example, the red / blue display LCD 16RB). The light enters the combining prism 18. In this case, the direction in which the NA is small, that is, the long axis direction of the rectangle is parallel to the incident surface 34 entering the dichroic film 20 of the composite prism 18, and the direction in which the NA is large, that is, the short axis direction of the rectangle is perpendicular to the incident surface 34. To be in the right direction. By arranging the illuminating light guide rod 12 and the combining prism 18 in such a relationship, the range of the incident angle that effectively enters the dichroic film 20 that is a film having a very large incident angle dependency can be reduced. Therefore, the characteristics of the dichroic film 20 can be better utilized, and light loss in the dichroic film 20 can be reduced.

  In the configuration as described above, the signal processing circuit 28 controls the LED drive circuit (R / B) 24RB, the LED drive circuit (G) 24G, and the LCD drive circuit 26 as shown in the timing chart of FIG. .

  In other words, the signal processing circuit 28 causes the LCD driving circuit 26 to drive the LCD while switching between the positive direction and the reverse direction with respect to a certain intermediate potential during one image display period (one frame). In accordance with the switching timing, the image displayed on the red / blue display LCD 16RB is also switched between the red component and the blue component of the input image data. In accordance with the switching timing, the LED driving circuit (R / B) 24RB is driven to switch between driving the red LED 10R and driving the blue LED 10B. That is, the red LED 10R emits light in the positive part of the LCD drive, and the blue LED 10B emits light in the negative part. Accordingly, as illumination light from the emission end of the dichroic prism 14, red light and blue light are alternately emitted in a time-division manner, and an image of a color component corresponding to the color of the light is displayed on the red / blue display LCD 16RB. As a result, the illumination light is modulated.

  On the other hand, the LED driving circuit (G) 24G is controlled so that the green LED 10G emits light in both the positive and negative portions of the LCD driving, and the LCD driving circuit 26 receives the input image data. The green component is controlled to be displayed on the green display LCD 16G. That is, the same image is displayed twice on the green display LCD 16G. Therefore, the green light that is the illumination light from the exit end of the illumination light guide rod 12G is modulated by the green component image displayed on the green display LCD 16G.

  As described above, in the first embodiment, two LCDs are used, and the light from the red LED 10R and the light from the blue LED 10B are sequentially applied to the red / blue display LCD 16RB which is one LCD in time series. The red / blue display LCD 16RB switches to illuminate as illumination light, and sequentially modulates the illumination light in time series according to image data corresponding to the color of the illumination light in synchronization with the change in the color of the illumination light. It is what you are doing. For green with high specific visibility, the green LED 10G is caused to emit light and the image of the green component is projected and displayed both when the red LED 10R emits light and when the blue LED 10B emits light. Therefore, a display with little change in luminance and less noticeable color breakup can be performed.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.

  In the present embodiment, the red LED 10R, the blue LED 10B, the illumination light guide rods 12R and 12B, and the dichroic prism in the first embodiment are used as sequential illumination means for sequentially switching light of a plurality of colors in time series and emitting them as illumination light. 14 is replaced with a configuration as shown in FIGS. 4 (A) and 4 (B).

  That is, the sequential illumination means in this embodiment arranges four red LEDs 10R and four blue LEDs 10B on a rotating plate 38 rotated by a motor 36, and has an emission end on the red / blue display LCD 16RB. One illumination light guide rod 12RB is disposed so as to face each other. It should be noted that the red LED and the blue LED are arranged with an interval slightly wider than the interval between the red LEDs or between the blue LEDs. Then, the signal processing circuit 28 rotates the rotating plate 38 by the motor 36 and, along with the rotation, the LED driving circuit so as to drive and drive the LED that has come to the position facing the incident end 40 of the illumination light guide rod 12RB. (R / B) By controlling 24RB, the red / blue display LCD 16RB is alternately illuminated with red light and blue light.

  FIG. 4C shows the timing relationship. In the figure, it is assumed that the LED emits light when the waveform is in a high state.

  That is, at the beginning of the red illumination period, first, the red LED indicated by the circle numeral 1 emits light, and the first LED moves to a position in the middle of the incident end 40 of the illumination light guide rod 12RB. The next red LED indicated by 2 starts to emit light. And when this 2nd LED moves to the center position of the incident end 40 of the light guide rod 12RB for illumination, while the said 1st LED is light-extinguished, the light emission of the next red LED shown by the round numeral 3 is emitted. Begins. Thereafter, when the third LED moves to the central position of the incident end 40 of the illumination light guide rod 12RB, the second LED is turned off and the next red LED indicated by the circled number 4 emits light. Begins. When the fourth LED moves to the center position of the incident end 40 of the illumination light guide rod 12RB, the third LED is turned off. However, this time, it is not preferable to mix red light and blue light, so the adjacent blue LED indicated by the circled number 5 is not lit. Then, before the fifth LED is applied to the incident end 40 of the illumination light guide rod 12RB, the fourth LED is also turned off.

  The blue LEDs 10B indicated by the circled numbers 5 to 8 are also sequentially emitted in the same procedure as the red LEDs 10R indicated by the circled numbers 1 to 4.

  The drive current of each LED may be a rated current as in the first embodiment, but the LEDs that sequentially emit light are switched in this way, that is, each LED is a short time. Since light emission is repeated at a predetermined cycle, it is possible to obtain brighter light emission by flowing a current larger than the rated current.

  Here, the rotating plate 38 is rotated to switch the LED facing the incident end 40 of the illumination light guide rod 12RB. However, as shown in FIGS. 5A and 5B, the red LED 10R is switched. In addition, the blue LED 10B is fixedly arranged, and the take-in port 46 of the rotating light guide rod 44 held by the rotating holder 42 coupled to the rotating shaft of the motor 36 is rotated so as to sequentially face the light emitting surface of each LED. It is good also as a structure made to do. Even with such a configuration, red light and blue light can be alternately extracted as illumination light on the same principle.

  4A and 4B or FIGS. 5A and 5B, the number of red LEDs 10R and the number of blue LEDs 10B are not necessarily the same. For example, if there is a luminance difference between the two LEDs, the number of lower LEDs may be set according to the required performance and application, such as increasing the number of lower LEDs. In this case, it goes without saying that the switching between the red component and the blue component of the input image data displayed on the red / blue display LCD 16RB needs to be changed according to the switching timing determined by the set number.

[Third Embodiment]
FIG. 6 is a diagram showing an optical configuration of a display device according to the third embodiment of the present invention. Since the electrical configuration is the same as that of FIG. 1 in the first embodiment, the illustration is omitted.

  That is, the third embodiment uses a rotating light guide rod 44 as shown in FIGS. 5A and 5B in the second embodiment to drive a plurality of green LEDs 10G at a rated current or more. By sequentially emitting pulses with current, the amount of light is increased for green with high relative visibility.

  Therefore, a brighter projection image can be obtained.

[Fourth Embodiment]
While the light emitted from the LED is unpolarized, the LCD as a spatial modulation element uses only one of the two polarization components orthogonal to each other and the other polarization component. Not. Therefore, in the fourth embodiment, both polarization components are to be used for the green component having high specific visibility.

  FIG. 7 is a diagram showing an optical configuration of a display device according to the fourth embodiment of the present invention. Since the electrical configuration is the same as that of FIG. 1 in the first embodiment, the illustration is omitted.

That is, in the fourth embodiment, after the green light from the green LED 10G is converted to a certain small NA by the illumination light guide rod 12G, the same size and shape as the emission end of the illumination light guide rod 12G, respectively. Is incident on a polarizing beam splitter 48 having two incident ends and two outgoing ends. The polarization beam splitter 48 includes a polarization separation film 50 that transmits the P-polarized component and reflects the S-polarized component, and converts the green light incident from the incident end into the P-polarized component light and the S-polarized component light. And are emitted from the respective emission ends. (Here, the P-polarized component and the S-polarized component are defined by the polarization directions with respect to the polarization separation film 50 and the polarization composition film 52.)
The P-polarized component light is applied as illumination light to the green display LCD 16G as in the first embodiment, and is modulated by the green display LCD 16G to become an S-polarized component. Is incident on the combining prism 18 having In addition to the dichroic film 20, the combining prism 18 includes a polarization combining film 52 that combines the light of the P polarization component and the light of the S polarization component by transmitting the P polarization component and reflecting the S polarization component. ing. Therefore, the P-polarized component green light modulated by the green display LCD 16G is reflected by the polarization composite film 52 in the direction of the projection lens 22 and becomes projection light for projecting an image.

  On the other hand, the light of the S-polarized component is two relay rods that are medium-polished rods that have the same cross section as the exit end of the polarizing beam splitter 48, that is, the exit end of the illumination light guide rod 12G. The other green display LCD 16G is irradiated as illumination light by 54 and two medium-density reflecting prisms 56. Then, after being modulated by the LCD 16G for green display to become a P-polarized component, the P-polarized component that has been modulated by being transmitted through the polarization synthesis film 52 of the synthesis prism 18 and reflected by the polarization synthesis film 52 Together with the green light, it becomes projection light for projecting an image.

  The reflection prism 56 has a refractive index higher than that of the relay rod 54, so that the light incident on the first reflection prism 56 from the first relay rod 54 is reflected to the second relay rod 54. Generation of a component that leaks out of the relay rod 54 when entering the relay rod 54 can be prevented.

  According to the configuration of the fourth embodiment as described above, it is possible to efficiently use the light of the green component that is required as a very large amount of light due to the relative luminous efficiency, and to obtain brighter projection light. There is.

  In addition, since two green display LCDs 16G that modulate the light of the green component are used, if each of them can be displayed with, for example, an 8-bit gradation, this configuration can express gradation equivalent to 9 bits. Therefore, the green expression can be made more finely.

[Fifth Embodiment]
FIG. 8 is a diagram showing an optical configuration of a display device according to the fifth embodiment of the present invention. Since the electrical configuration is the same as that of FIG. 1 in the first embodiment, the illustration is omitted.

  That is, in the fifth embodiment, illumination means for emitting blue-green illumination light is further provided in the configuration of FIG. This is composed of a blue-green LED 10V, an illumination light guide rod 12V, and a blue-green display LCD 16V. In this case, the synthetic prism 18 reflects the light of the red and blue light wavelengths and transmits the light of the green and blue-green wavelengths, and the red and blue light. And a dichroic film “B” 20B that transmits light of a wavelength and reflects light of wavelengths of green light and blue-green light.

  According to such a configuration, since the green LED 10G and the blue-green LED 10V use two light components of the color component in the area close to green, the light amount near the green component is increased, and brighter projection light can be obtained.

  Also, as shown in FIG. 9, by adding blue-green to the color reproduction range 58 based on the mixed colors of red, green, and blue, the color reproduction range can be reduced as in the color reproduction range 60 based on the four-color mixed color. Can be larger.

  Although the present invention has been described above based on the embodiments, the present invention is not limited to the above-described embodiments, and various modifications and applications are naturally possible within the scope of the gist of the present invention.

  For example, instead of a medium-density illumination light guide rod or relay rod, a pipe having a hollow structure in which a reflective coating having a high reflectance is formed on the inner side surface may be used.

  In addition, the green color component is required to have a larger amount of light due to the characteristic of relative luminous sensitivity, but the current LED light amount level is not so high for green. In contrast to the frame sequential, the green component emits an LED at any time. However, if the performance of the LED changes in the future, color components other than green may be lit continuously. Alternatively, when image data to be displayed is specified in advance, for example, when specializing in displaying an image with a large amount of red component such as an endoscopic image, the green component and the blue component are used in a surface sequential manner. You may comprise so that LED may be set as continuous lighting. Thus, what is necessary is just to set it as the structure which lights continuously what needs the most light quantity.

  Although the LCD has been described as an example of the spatial modulation element, in the first to third and fifth embodiments, a display element using liquid crystal such as LCOS may be used, and gradation display is performed by pulse width modulation. A spatial modulation element, for example, a digital micromirror device (DMD: registered trademark of Texas Instruments, USA) may be used. Note that details of the DMD (registered trademark) are disclosed in, for example, US 2002/0024637 A1 and Japanese Patent Application Laid-Open No. 2002-350975, and a description thereof is omitted here.

  In addition, if the display device using the illumination device of the present invention is applied to a component for projecting an image in a photographic exposure device, a color copier, a color printer, a rewritable electronic paper recording device, etc., it is effective because color adjustment is easy. It can be a good image forming means.

(Appendix)
The invention having the following configuration can be extracted from the specific embodiment.

(1) In a display device that displays an image corresponding to input image data,
A plurality of illumination means for emitting illumination light;
A plurality of spatial modulation elements which are arranged corresponding to the plurality of illumination means and which modulate incident illumination light according to the image data and emit modulated light;
A combined projection means for combining and projecting the modulated light from the plurality of spatial modulation elements;
Comprising
Among the plurality of illumination means, at least one is a sequential illumination means that sequentially switches light of a plurality of colors in time series and emits it as illumination light,
Among the plurality of spatial modulation elements, the spatial modulation element corresponding to the sequential illumination unit is in accordance with image data corresponding to the color of illumination light in synchronization with a change in the color of illumination light from the sequential illumination unit. Modulates illumination light sequentially in time series,
A display device characterized by that.

  This configuration corresponds to FIGS. 1 to 9.

  That is, according to the display device described in (1), since the illumination light of different emission colors is sequentially modulated in time series by the common spatial modulation element, the number of spatial modulation elements of the display device can be reduced, In addition, the composite projection means can be configured simply and compactly.

(2) Among the plurality of illumination means, at least one illumination means other than the sequential illumination means is a continuous illumination means that emits light of one color as illumination light,
Of the plurality of spatial modulation elements, the spatial modulation element corresponding to the continuous illumination means continuously modulates illumination light according to image data corresponding to the color of illumination light from the continuous illumination means.
(1) The display device described above.

  This configuration corresponds to FIGS. 1 to 9.

  That is, according to the display device described in (2), since light of a specific color is continuously modulated in time, light of a color that requires a large amount of light can be efficiently displayed.

  (3) The color of the illumination light from the continuous illumination means is a color having a higher relative visibility than any of the plurality of colors of the illumination light from the sequential illumination means. Display device.

  This configuration corresponds to FIGS. 1 to 9.

  That is, according to the display device described in (3), a color image having a low relative visibility is displayed in a time-division manner, and a color image having a high specific visibility is continuously displayed. Bright images can be displayed.

(4) The spatial modulation element is a liquid crystal display element,
Polarization separation means for separating the illumination light from the continuous illumination means into two polarization components;
A light guide means for guiding the light of the two polarization components separated by the polarization separation means to the corresponding two liquid crystal display elements while maintaining the polarization plane;
Further comprising
(2) The display device according to (2).

  This configuration corresponds to FIG.

  That is, according to the display device described in (4), since light is separated into two polarization components and light having an effective polarization component is incident on each of the two liquid crystal display elements, the light is used efficiently. And a bright image can be displayed.

(5) The color of the illumination light from the continuous illumination means is green;
The plurality of colors of illumination light from the sequential illumination means are blue and red,
The display device according to (3), characterized in that:

  This configuration corresponds to FIGS. 1 to 7.

  That is, according to the display device described in (5), it takes a long time to display an image with green light. Therefore, the most necessary green component when combining each color component to display white is used as the red component or the green component. It can be increased compared to the blue component, and a bright projected image with a well-balanced color can be obtained.

(6) The continuous illumination means is
First continuous illumination means for generating green component illumination light;
Second continuous illumination means for generating light of a blue-green component having a shorter wavelength than the illumination light of the first continuous illumination means;
(3) The display device according to (3).

  This configuration corresponds to FIG. 8 and FIG.

  That is, according to the display device described in (6), the illumination light of the green component and the blue-green component is generated from different continuous illumination means and modulated by different spatial modulation elements, respectively. The range is expanded, and color reproduction that is faithful to the appearance is possible.

(7) The sequential illumination means is
At least two light sources having different emission colors;
Color synthesis means for synthesizing the light from each light source;
(1) The display device according to (1).

  This configuration corresponds to FIG.

  That is, according to the display device described in (7), light having different emission colors can be emitted from the same emission end by the color synthesizing unit.

  (8) The display device according to (1), wherein the composite projection unit includes a composite prism or a mirror having a dichroic film and / or a polarization composite film.

  This configuration corresponds to FIGS. 1 to 9.

  That is, according to the display device described in (8), since the optical paths are synthesized using the difference in color and polarization direction of a plurality of modulated lights, the light is synthesized more efficiently than in the case of synthesizing with a half mirror or the like. Therefore, it is possible to prevent a decrease in contrast due to stray light and to obtain a bright projected image.

(9) The plurality of illumination means are:
A light source;
A light guide means that guides light from the light source incident from the incident end, converts the light spread angle to be small, and emits the light from the exit end;
Have
In the first direction and the second direction perpendicular to each other and perpendicular to the traveling direction of the light exiting from the exit end, the light guide means has a second direction that is greater than the light spread angle in the first direction. The divergence angle is converted so that the light divergence angle becomes smaller, and the incident surface with respect to the synthesis surface of the synthesis prism or mirror is arranged in parallel with the second direction.
(8) The display device according to (8).

  This configuration corresponds to FIG.

  That is, according to the display device described in (9), since the incident angle range of the composite prism or mirror can be reduced, the design of the dichroic film or the polarization composite film of the composite prism or mirror becomes easy, and the composite prism And a mirror can be produced at a low cost, and the loss of the composite prism and the mirror is reduced, so that a bright projection image can be obtained.

(10) The sequential illumination means is
At least two light sources with different emission colors;
Selective light guiding means for selectively taking in light from at least two types of light sources sequentially and guiding the light to the corresponding one of the spatial modulation elements;
(1) The display device according to (1).

  This configuration corresponds to FIG. 4 and FIG.

  That is, according to the display device described in (10), a prism for synthesizing the illumination light is unnecessary, and a loss in the prism is eliminated and a bright projection image is obtained.

  (11) The display device according to (10), wherein the selective light guiding unit moves relative to the two types of light sources.

  This configuration corresponds to FIG. 4 and FIG.

  That is, according to the display device described in (11), a prism for synthesizing illumination light is not necessary, and a loss in the prism is eliminated and a bright projection image is obtained.

(12) first illumination means for emitting illumination light of the first color;
Second illumination means for emitting illumination light of a second color;
A combining prism that combines the illumination light of the first color emitted by the first illumination unit and the illumination light of the second color emitted by the second illumination unit;
Comprising
The first and second illumination means are respectively
A light source;
A light guide means that guides light from the light source incident from the incident end, converts the light spread angle to be small, and emits the light from the exit end;
Have
Each of the light guiding means has a second direction that is perpendicular to the traveling direction of the light emitted from the light emitting end and perpendicular to each other, and is larger than the light spreading angle in the first direction. The divergence angle is converted so that the divergence angle of the light in the direction of is smaller, and the incident surface with respect to the synthesis surface of the synthesis prism and the second direction are arranged in parallel.
A lighting device characterized by that.

  This configuration corresponds to FIG.

  That is, according to the illumination device described in (12), since the incident angle range of the combining prism can be reduced, the design of the dichroic film and the polarization combining film of the combining prism becomes easy, and the combining prism can be manufactured at low cost. In addition, the loss in the combining prism is reduced, and bright illumination light can be obtained.

It is a figure which shows the structure of the display apparatus which concerns on 1st Embodiment of this invention. It is a figure for demonstrating the relationship between the light guide rod for illumination, and a synthetic | combination prism. It is a figure which shows the timing chart for demonstrating the switching timing of each color light. (A) is a figure which shows the structure of the sequential illumination means in the display apparatus which concerns on 2nd Embodiment of this invention, (B) is a top view which shows the arrangement state of LED on a rotating plate, (C) is each LED. It is a figure which shows the timing chart for demonstrating the light emission timing of. (A) is a figure which shows the structure of the sequential illumination means in the modification of 2nd Embodiment, (B) is a top view which shows the arrangement state of LED. It is a figure which shows the optical structure of the display apparatus which concerns on 3rd Embodiment of this invention. It is a figure which shows the optical structure of the display apparatus which concerns on 4th Embodiment of this invention. It is a figure which shows the optical structure of the display apparatus which concerns on 5th Embodiment of this invention. It is a chromaticity diagram regarding the light emission wavelength of each LED.

Explanation of symbols

    10R ... red LED, 10G ... green LED, 10B ... blue LED, 10V ... blue-green LED, 12, 12R, 12G, 12B, 12RB, 12V ... light guide rod for illumination, 14 ... dichroic prism, 16 ... red / blue display LCD: 18 ... Synthetic prism, 20 ... Dichroic film, 22 ... Projection lens, 24RB ... LED drive circuit (R / B), 24G ... LED drive circuit (G), 26 ... LCD drive circuit, 28 ... Signal processing circuit, DESCRIPTION OF SYMBOLS 30 ... Incident end of light guide rod for illumination 32 ... Outlet end of light guide rod for illumination 34 ... Incident surface, 36 ... Motor, 38 ... Rotating plate, 40 ... Incident end of light guide rod 12RB for illumination, 42 ... Rotating holder 44. Rotating light guide rod 46 46 Rotating light guide rod inlet 48. Polarizing beam splitter 50. Polarizing separation film 52 ... polarization combining film, 54 ... relay rod 56 ... reflecting prism, a color reproduction range by 58 ... 3-color mixing, color reproduction range by 60 ... 4-color mixing.

Claims (12)

In a display device that displays an image corresponding to input image data,
A plurality of illumination means for emitting illumination light;
A plurality of spatial modulation elements that are arranged corresponding to the plurality of illumination means and modulate the incident illumination light according to the image data and emit modulated light;
A combining projection unit configured to combine and project the modulated light from the plurality of spatial modulation elements;
Comprising
Among the plurality of illumination means, at least one is a sequential illumination means that sequentially emits light of a plurality of colors in time series and emits it as illumination light,
Among the plurality of spatial modulation elements, the spatial modulation element corresponding to the sequential illumination unit is synchronized with a change in the color of illumination light from the sequential illumination unit, according to image data corresponding to the color of the illumination light. Modulates illumination light sequentially in time series,
A display device characterized by that. Of the plurality of illumination means, at least one illumination means other than the sequential illumination means is a continuous illumination means for emitting light of one color as illumination light,
Among the plurality of spatial modulation elements, the spatial modulation element corresponding to the continuous illumination means continuously modulates illumination light according to image data corresponding to the color of illumination light from the continuous illumination means.
The display device according to claim 1.   The display device according to claim 2, wherein the color of the illumination light from the continuous illumination unit is a color having higher relative visibility than any of the plurality of colors of the illumination light from the sequential illumination unit. The spatial modulation element is a liquid crystal display element;
Polarization separation means for separating the illumination light from the continuous illumination means into two polarization components;
A light guide means for guiding the light of the two polarization components separated by the polarization separation means while holding the polarization plane on the corresponding two liquid crystal display elements;
Further comprising
The display device according to claim 2. The color of the illumination light from the continuous illumination means is green,
A plurality of colors of illumination light from the sequential illumination means are blue and red;
The display device according to claim 3. The continuous illumination means includes
First continuous illumination means for generating green component illumination light;
Second continuous illumination means for generating light of a blue-green component having a shorter wavelength than the illumination light of the first continuous illumination means;
The display device according to claim 3, comprising: The sequential illumination means includes
At least two light sources having different emission colors;
Color synthesis means for synthesizing the light from each light source;
The display device according to claim 1, comprising:   The display device according to claim 1, wherein the composite projection unit includes a composite prism or a mirror having a dichroic film and / or a polarization composite film. The plurality of illumination means includes:
A light source;
A light guide unit that guides light from the light source incident from the incident end, converts the light spread angle to be small, and emits the light from the exit end;
Have
In the first direction and the second direction perpendicular to each other and perpendicular to the traveling direction of the light exiting from the exit end, the light guide means has a second direction that is greater than the light spread angle in the first direction. The light spread angle is converted so that the light spread angle becomes smaller, and the incident surface with respect to the composite surface of the composite prism or mirror is arranged in parallel with the second direction.
The display device according to claim 8. The sequential illumination means includes
At least two light sources with different emission colors;
Selective light guiding means for selectively capturing light from the at least two types of light sources sequentially and guiding the light to the corresponding one of the spatial modulation elements;
The display device according to claim 1, comprising:   The display device according to claim 10, wherein the selective light guiding unit moves relative to the two types of light sources. First illumination means for emitting illumination light of a first color;
Second illumination means for emitting illumination light of a second color;
A combining prism that combines the illumination light of the first color emitted by the first illumination unit and the illumination light of the second color emitted by the second illumination unit;
Comprising
The first and second illumination means are respectively
A light source;
A light guide unit that guides light from the light source incident from the incident end, converts the light spread angle to be small, and emits the light from the exit end;
Have
Each of the light guide means has a second direction that is perpendicular to the traveling direction of the light emitted from the light emitting end and perpendicular to each other than the light spread angle in the first direction. The divergence angle is converted so that the divergence angle of the light in the direction is smaller, and the incident surface with respect to the synthesis surface of the synthesis prism is arranged so as to be parallel to the second direction.
A lighting device characterized by that.

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