JP2014206630A - Projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection type display device that can accurately irradiate a fluorescent material with excitation light and make variations in luminance and chromaticity due to an angle of field of a projected image inconspicuous.SOLUTION: A projection type display device includes a light source 11, projectors 1 to 3, a Fresnel lens 4 on which rays of excitation light emitted from the projectors 1 to 3 are made incident, a lenticular lens 5 that collects the rays of excitation light from the projectors 1 to 3 emitted from the Fresnel lens 4 into a light collection point determined for each of the projectors 1 to 3, and a screen 30 that is arranged at each of the light collection points determined for each of the projectors 1 to 3, and has R, G, and B fluorescent materials 6a, 6b, and 6c each converting the rays of excitation light collected by using the lenticular lens 5 into rays of visible light R, G, and B and emitting the rays of visible light.

Description

  The present invention relates to a projection display device that modulates the intensity of light from a light source using a video signal by a light valve and projects the intensity-modulated video signal on a screen.

  The projection display device allows image light projected from the projector to be incident on the rear surface of the transmission screen formed in a substantially rectangular flat plate shape, so that an observer located on the front side of the transmission screen can transmit the projection screen. The image light that is transmitted through and is emitted can be observed. The projection display device is configured to directly project R, G, and B signals, which are components of a video signal, onto a transmissive screen to form an image.

  In such a configuration, chromatic aberration due to the wavelength dependence of the lens refractive index occurs in a lens such as a Fresnel lens used for a transmissive screen, and a diffusion difference due to wavelength occurs in the diffusing portion of the transmissive screen, depending on the viewing angle A color shift occurs where the color changes on the transmissive screen.

  As a method for improving such color shift, a laser beam is scanned two-dimensionally, and this is used as excitation light to emit R, G, B phosphors on the screen, thereby making the viewing angle larger than that of a transmissive screen. A method for improvement has been proposed (see, for example, Patent Document 1).

  In addition, a method has been proposed in which an image is two-dimensionally formed using a cathode ray tube that emits ultraviolet light, and this is enlarged by a lens to emit R, G, B phosphors on the screen (for example, patents). Reference 2). Further, in recent years, phosphors have been developed for illumination, and R, G, B phosphors by excitation of near-ultraviolet light have been proposed (for example, see Non-Patent Document 1).

Japanese Patent No. 4612723 JP-A-10-17259

Toshiba Review Vol67 No2 (2012) p. 45

  However, although a method of applying a phosphor on a screen and exciting it with ultraviolet rays or near ultraviolet rays is excellent in terms of improving the viewing angle, there are many methods such as a polygon mirror for scanning laser light two-dimensionally. A movable mirror such as a galvanometer mirror is required by rotating the square mirror. Such a movable part becomes a problem in terms of life and reliability.

  Further, in the method of forming a two-dimensional image and enlarging and projecting with a lens, it is difficult to accurately irradiate the R, G, and B phosphors with excitation light due to variations in components, resulting in a color shift. There was a problem.

  In view of the above, an object of the present invention is to provide a projection display device that can accurately irradiate phosphors with excitation light and can make luminance and chromaticity variations caused by the viewing angle of an image inconspicuous. And

  The projection type display apparatus according to the present invention includes an excitation light source, a first projector that emits excitation light that is intensity-modulated with respect to light output from the excitation light source using an R signal of a video signal, and output from the excitation light source. A second projector that emits excitation light that is intensity-modulated with respect to the emitted light using the G signal of the video signal, and excitation light that is intensity-modulated with respect to the light output from the excitation light source using the B signal of the video signal A third projector that emits light, a Fresnel lens to which excitation light emitted from the first to third projectors enters, and excitation light from the first to third projectors emitted from the Fresnel lens. A lenticular lens for condensing light at a condensing point determined for each projector; and a lenticular lens disposed at the condensing point determined for each projector; The excitation light is focused using a sieve lens are those with R, G, R which emits light by converting B to each of the visible light, G, and a screen having a B phosphor.

  According to the present invention, the excitation light source, the first projector that emits the excitation light that is intensity-modulated with respect to the light output from the excitation light source using the R signal of the image signal, and the image signal regarding the light output from the excitation light source. A second projector that emits excitation light that is intensity-modulated using the G signal, a third projector that emits excitation light that is intensity-modulated using the B signal of the video signal for the light output from the excitation light source, The Fresnel lens to which the excitation light emitted from the first to third projectors enters, and the excitation light from the first to third projectors emitted from the Fresnel lens are collected at a condensing point determined for each projector. The excitation light that is arranged at the condensing point determined for each projector and the lenticular lens and condensed using the lenticular lens is R, G, B, and so on. And a screen having R, G, and B phosphors to emit light by converting the respective visible light.

  Therefore, since the excitation light from the first to third projectors is accurately applied to the R, G, B phosphors on the screen, color crosstalk can be eliminated. In addition, since the R, G, and B phosphors emit light, the viewing angle of the video is widened, and variations in luminance and chromaticity caused by the viewing angle can be made inconspicuous.

1 is a schematic configuration diagram of a projection display device according to a first embodiment. It is a schematic block diagram of a projector. FIG. 3 is an enlarged view of a portion III surrounded by an alternate long and short dash line in FIG. 2. FIG. 3 is an enlarged view of a portion IV surrounded by a one-dot chain line in FIG. 2. It is a block diagram of the screen seen from the observer side.

<Embodiment 1>
Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a projection display device according to Embodiment 1, and schematically shows a state in which the overall configuration of the projection display device is viewed from above. As shown in FIG. 1, the projection display device includes a blue (B) projector 1 (third projector), a green (G) projector 2 (second projector), and a red (R) projector 3. (First projector) and a screen 30, and further includes a light source 11 (see FIG. 2) provided for each of the projectors 1 to 3.

  Next, although the projectors 1-3 are demonstrated, since the projectors 1-3 are the same structures, the projector 1 is demonstrated here. FIG. 2 is a schematic configuration diagram of the projector 1. The projector 1 includes a light source 11 that is an excitation light source, a laser driving circuit 10, a collimator lens 12, a condenser lens 13, an optical integrator 14, a relay lens 15, a prism 16, a light valve 17, and a projection lens 18. And a video signal processing circuit 20 (distortion correction circuit).

  The light source 11 is composed of a semiconductor laser or the like, and outputs excitation light. More specifically, the light source 11 is configured by a laser diode (laser light source) that outputs light having a wavelength of 405 nm, for example, instead of the three colors R, G, and B or white. The laser drive circuit 10 is a circuit that drives the light source 11. The collimator lens 12 converts the light from the light source 11 into parallel light, and the condenser lens 13 condenses the light from the collimator lens 12. The light integrator 14 mixes the light from the condenser lens 13 to make the illumination light uniform, and the relay lens 15 causes the light valve 17 to form an image on the light valve 17.

  The light valve 17 is composed of, for example, a DMD (Digital Micromirror Device), and modulates illumination light emitted from the optical integrator 14 via the relay lens 15 and the prism 16. The prism 16 separates the illumination light from the relay lens 15 and the reflected light from the light valve 17. The projection lens 18 magnifies and projects the reflected light from the light valve 17. The video signal processing circuit 20 receives the video signal from the input terminal 19 and performs resolution conversion, gamma processing, distortion correction, control of the light valve 17, and the like.

  Here, the projectors 1 to 3 have substantially the same configuration as a general projector, but the light source 11 is not composed of three colors of R, G, and B or white, but is configured by a laser diode that outputs light having a wavelength of 405 nm. In the projection optical system, the projector 2 is non-offset and the projectors 1 and 3 are both offset and project light as described later.

  Returning to the description of the projection display device using FIG. 1, the projector 1 projects the B signal (shown by a solid line in FIG. 1) on the screen 30 and the projector 2 projects the G signal (in FIG. 1). The projector 3 projects an R signal (shown by a broken line in FIG. 1) of the video signal onto the screen 30. The screen 30 includes a Fresnel lens 4, a lenticular lens 5, and a phosphor portion 6, and the Fresnel lens 4, the lenticular lens 5, and the phosphor portion 6 are arranged in this order from the incident side.

  The projectors 1 to 3 are arranged in the left-right direction (horizontal direction) centered on the projector 2 when viewed from the viewer side, and the emission positions (pupil positions) of the projectors 1 to 3 are set in one pixel of the phosphor unit 6. The R, G, B phosphors 6a, 6b, 6c (see FIG. 3), which will be described later, are arranged on the same axis parallel to the arrangement direction.

  The R, G, and B projected images on the screen 30 are aligned on a pixel basis. The misalignment causes color blur at the edge of the high definition image. For specific alignment, it is best to physically adjust the six axes for each projector 1 to 3, but when there is distortion in the optical system, the distortion correction function of the video signal processing circuit 20 is used. It is also possible to correct it. The distortion correction function of the video signal processing circuit 20 is to electrically correct the projection distortion, position, and screen size of the optical system. By electrically correcting the projection distortion of the optical system, the optical system can be made inexpensive. It is possible to configure. In this case, since resolution conversion is partly accompanied by degradation of resolution, a general moving image is sufficiently within an allowable range.

  Next, the optical path at the end of the screen 30 will be described with reference to FIG. FIG. 3 is an enlarged view of a portion III surrounded by a one-dot chain line in FIG. 2, that is, a schematic view of an optical path at the end of the screen 30. The optical path of the projector 1 is illustrated by a solid line, the optical path of the projector 2 is illustrated by a one-dot chain line, and the optical path of the projector 3 is illustrated by a broken line.

  The projection light from the projectors 1 to 3 is first incident on the Fresnel lens 4. The focal length of the Fresnel lens 4 coincides with the projection distance of the projector 2, and the projection light of the projector 2 becomes substantially parallel light on the emission side of the Fresnel lens 4.

  For the projector 1, the projection distance and the focal length of the Fresnel lens 4 coincide with each other. However, since the projector 1 is shifted to the right by the distance from the projector 1 to the projector 2, the emitted light from the Fresnel lens 4. Is emitted to the left according to the shift amount.

  For the projector 3, the projection distance and the focal length of the Fresnel lens 4 are the same, but since the projector 3 is shifted to the left by the distance from the projector 3 to the projector 2, the emitted light from the Fresnel lens 4 Is emitted to the right according to the shift amount.

  The excitation lights of the projectors 1 to 3 that have passed through the Fresnel lens 4 are then incident on the lenticular lens 5. The lenticular lens 5 has a structure in which cylindrical lenses are arranged in the left-right direction at equal intervals.

  Since the projection light of the projector 2 is substantially parallel light on the emission side of the Fresnel lens 4, it is input to the lenticular lens 5 as parallel light. Since the lenticular lens 5 is a convex lens, it collects light at the focal position when parallel light is input. Since the projection light of the projector 1 is substantially parallel light in the left direction on the emission side of the Fresnel lens 4, it is condensed at one point of the focal length of the lenticular lens 5. Since the excitation light of the projector 3 is substantially parallel light in the right direction on the emission side of the Fresnel lens 4, it is condensed at one point of the focal length of the lenticular lens 5.

  In the projectors 1 to 3, the condensing position relationship on the emission side of the lenticular lens 5 is located on the left and right sides with an interval around the condensing point of the excitation light of the projector 2. As described above, the excitation light of the projectors 1 to 3 has a condensing point with respect to the lens pitch of the lenticular lens 5. Since each condensing point is determined by the focal length of the lenticular lens 5 and the excitation light emission angle from the Fresnel lens 4, the condensing point can be specified with extremely high accuracy.

  On the exit side of the lenticular lens 5, a phosphor portion 6 coated with R, G, B phosphors 6a, 6b, 6c is disposed. Phosphors 6a, 6b, and 6c that emit light by converting excitation light into respective wavelength regions of R, G, and B, that is, converting into visible light of R, G, and B, are predetermined in the phosphor unit 6. It is applied at intervals. In the phosphor portion 6, the B phosphor 6 c is applied around the excitation light condensing point of the projector 1, and the G phosphor 6 b is applied around the excitation light condensing point of the projector 2. An R phosphor 6a is applied around the light spot.

  Further, in the phosphor portion 6, a light shielding body 6d (shielding means) that absorbs light without including the phosphor is applied to each boundary of the R, G, B phosphors 6a, 6b, and 6c. Since the light shield 6d prevents light emission of the R, G, B phosphors 6a, 6b, 6c caused by stray light of the Fresnel lens 4 and the lenticular lens 5, the correct color in the R, G, B phosphors 6a, 6b, 6c Can be displayed. Further, since the light shield 6d absorbs external light on the surface of the screen 30, it is possible to improve the contrast in the R, G, B phosphors 6a, 6b, 6c.

  Next, the optical path at the center of the screen 30 will be described with reference to FIG. 4 is an enlarged view of a portion IV surrounded by a one-dot chain line in FIG. 2, that is, a schematic diagram of an optical path in the central portion of the screen 30. FIG. Excitation light projected from the projectors 1 to 3 is converted into parallel light on the emission side of the Fresnel lens 4 as in the case of the end of the screen 30 shown in FIG. The light projected from the projector 3 is refracted at an angle of substantially parallel light obliquely to the left on the exit side of the Fresnel lens 4, and the light projected from the projector 3 is refracted at an angle of substantially parallel light oblique to the right on the exit side of the Fresnel lens 4. To do. Similarly, the output from the lenticular lens 5 is condensed at the focal length.

  As described above, the R, G, and B excitation lights projected from the projectors 1 to 3 are finally arranged at the condensing point of the lenticular lens 5, and the R, G, and B phosphors 6a, 6b, and 6c. Can be excited exactly to emit light. Therefore, it is possible to observe a good image with a wide viewing angle from the observer side. The condensing point of each excitation light is finally determined by the focal length and the incident angle of the lenticular lens 5. The incident angle is determined by the focal length of the Fresnel lens 4 and the projection angles of the projectors 1 to 3.

  Although each parameter varies depending on environmental conditions such as temperature and humidity in each component, the most sensitive is the positional relationship between the lenticular lens 5 and the phosphor portion 6. Therefore, it is possible to prevent fluctuations in the focal position by accurately maintaining the positional relationship between the lenticular lens 5 and the phosphor portion 6. As this method, the focal length of the lenticular lens 5 is made substantially equal to the thickness of the lenticular lens 5, and R, G, B phosphors 6 a, 6 b, 6 c are printed or applied on the exit side surface of the lenticular lens 5. It is possible to prevent displacement. As the material of the lenticular lens 5, glass or optical acrylic can be used.

  FIG. 5 is a configuration diagram of the screen viewed from the observer side. In the phosphor portion 6, R, G, B phosphors 6 a, 6 b, and 6 c are arranged on a straight line in the lens pitch along the lens configuration portion of the lenticular lens 5. As an example, when the DMD size is 0.65 inch and enlarged to 60 inches, the enlargement ratio is about 92 times. If one DMD pixel is 10 μm, one pixel is enlarged to 920 μm. In order not to deteriorate the resolution, it is necessary to make the lens pitch of the lenticular lens 5 sufficiently smaller than the pixel size of 920 μm and to pay attention to moire due to interference.

For example, if the pixel pitch is 1 / 2.5, which is 370 μm, the average pitch of the R, G, B phosphors 6a, 6b, 6c is about 120 μm. Even if the light shielding body 6d is 50 μm, the width of each of the R, G, B phosphors 6a, 6b, 6c is 70 μm, and the condensing size needs to be 70 μm or less. The condensing spot size in the laser light is expressed by the following mathematical formula.
d = 4 · λ · f · M ² / (π · D)
Here, d is the spot diameter, λ is the wavelength of the laser light source, f is the focal length of the lenticular lens 5, M ² is the beam quality of the laser, and D is the lens diameter of the lenticular lens 5. When the focal length f of the lenticular lens 5 is 3.0 mm, the lens diameter D of the lenticular lens 5 is 460 μm, and the laser beam quality M ² is 4.0, the condensing spot size d is 13.5 μm, and the lens aberration is reduced. Even if it is considered, it can be made sufficiently smaller than the phosphor size.

  Therefore, since the pitch of the R, G, B phosphors 6a, 6b, 6c can be made smaller than the pitch of one pixel to be displayed, resolution degradation due to the limitation of the phosphor pitch does not occur.

  As described above, in the projection display device according to the first embodiment, the light source 11, the projectors 1 to 3, the Fresnel lens 4 to which the excitation light emitted from the projectors 1 to 3 is incident, and the Fresnel lens 4 are emitted. The lenticular lens 5 for condensing the excitation light from the projectors 1 to 3 at a focal position determined for each of the projectors 1 to 3, and the lenticular lens respectively disposed at the focal position determined for each of the projectors 1 to 3. A screen 30 having R, G, and B phosphors 6a, 6b, and 6c that emit light by converting excitation light collected using the lens 5 into visible light of R, G, and B, respectively.

  Therefore, since the excitation light from the projectors 1 to 3 is accurately applied to the R, G, B phosphors 6a, 6b, and 6c of the screen 30, color crosstalk can be eliminated. Further, since the R, G, B phosphors 6a, 6b, and 6c emit light, the viewing angle of the image is widened, and variations in luminance and chromaticity caused by the viewing angle can be made inconspicuous.

  Also, the luminance and chromaticity difference between the projection display devices that occurs when a plurality of projection display devices are arranged side by side in the vertical direction and the horizontal direction is reduced, so that the joints between the projection display devices are not noticeable. Is possible.

  The projectors 1 to 3 are arranged so that the respective emission positions are arranged on the same axis parallel to the arrangement direction of the R, G, and B phosphors 6a, 6b, and 6c in one pixel, and the Fresnel lens 4 is the projector 1 To convert the excitation light from the projector 2 arranged in the center into parallel light, the excitation light from the other projectors 1 and 2 is also converted into substantially parallel light, and the excitation light from the projectors 1 to 3 Can enter the lenticular lens 5 in a well-balanced manner.

  Since each of the projectors 1 to 3 includes the video signal processing circuit 20 that electrically corrects the projection distortion, position, and screen size of the optical system, the optical system can be made inexpensive by electrically correcting the projection distortion of the optical system. It is possible to configure.

  Since the screen 30 further includes a light shielding body 6d that absorbs light at each boundary of the R, G, and B phosphors 6a, 6b, and 6c, R, G, and the like caused by stray light of the Fresnel lens 4 and the lenticular lens 5 are provided. It is possible to prevent the B phosphors 6a, 6b, and 6c from emitting light and display correct colors. Further, the contrast can be improved by absorbing external light on the surface of the screen 30.

  When the R, G, B phosphors 6a, 6b, 6c are applied to the exit side of the lenticular lens 5 and the lenticular lens 5 is formed so that its thickness is equal to its focal length, R, G , B phosphors 6a, 6b, 6c are applied to the exit side surface of the lenticular lens 5 so that the thickness of the lenticular lens 5 is substantially equal to the focal length thereof, thereby making the R, G, B phosphors 6a, 6b. , 6c and the focal length can be fixed, and crosstalk of R, G, B can be prevented with respect to dimensional changes of the lens and the like due to environmental changes such as temperature and humidity.

  Since the light source 11 is a laser light source that outputs light with a wavelength of 405 nm, the light source becomes small, and the dot size focused on the R, G, B phosphors 6a, 6b, and 6c can be reduced. As a result, color separation of R, G, and B can be performed more completely, and the phosphor pitch can be reduced, so that high resolution can be achieved. Further, light having a wavelength of 405 nm is used for a Blu-ray disc and can be configured at low cost. Furthermore, the laser light source can easily increase the output by synthesizing a plurality of lasers, and can increase the brightness.

  By using a laser as a light source, it is possible to increase the illumination efficiency of the light valve 17 with less diffused light components, and as a result, the size of the light valve 17 can be reduced, thereby reducing the cost. Further, since the F value of the projection lens can be increased, the manufacturing accuracy of the lens is improved, and since the lens itself can be reduced, it is possible to improve the performance such as the distortion rate and reduce the cost.

  Furthermore, since the wavelength of the light source is one wavelength and the wavelength band is extremely narrow, correction such as lens achromaticity becomes unnecessary, and the number of lenses can be reduced and the cost can be reduced. In addition, it is possible to increase the efficiency of electricity and light conversion, reduce power consumption (energy consumption), and combine multiple lasers. What is necessary is just to synthesize.

  In addition, since the laser light having a wavelength of 405 nm is used as the excitation light, the temperature rise of the R, G, B phosphors 6a, 6b, 6c due to the excitation light is extremely small, so that the R, G, B phosphors 6a, There is almost no deterioration resulting from the heat of 6b and 6c. Accordingly, even when the projection display device is used over a long period of time, burn-in symptoms are less likely to occur, and the projection display device can be used for a long time.

  In the present embodiment, one type of laser light source having a wavelength of 405 nm is used as the light source 11, but LEDs and laser light sources that generate light of various wavelengths in the ultraviolet to blue region have been commercialized. Can be used as the light source 11. In order to maximize luminous efficiency, R, G, and B may be excited with light of different wavelengths. From the viewpoint of cost, it is also possible to select whether R, G, and B are excited by light of the same wavelength or excited by light of different wavelengths.

  In the present embodiment, the phosphor portion 6 is provided on the emission side of the lenticular lens 5, but excitation light is transmitted between the lenticular lens 5 and the phosphor portion 6, and R, G, B fluorescence is transmitted. An optical filter (second optical filter) that reflects visible light emitted from the bodies 6a, 6b, and 6c may be disposed. In this case, since visible light from the R, G, B phosphors 6a, 6b, and 6c is directed toward the viewer, the luminance can be improved.

  The R, G, and B phosphors 6a, 6b, and 6c transmit the visible light of each of R, G, and B to the opposite side of the lenticular lens 5, that is, the viewer side of the phosphor unit 6, and the excitation light. An optical filter that reflects the light (first optical filter) may be disposed. In this case, the excitation light can be prevented from leaking to the outside, and the safety of the observer can be ensured. Further, when the excitation light is visible light such as purple, it is possible to improve color reproducibility by shielding it.

  Furthermore, since the R, G, B phosphors 6a, 6b, and 6c generally have a wide wavelength band, the color purity may be low. In this case, an optical filter that limits the emission wavelength from the phosphor portion 6 on the opposite side of the lenticular lens 5 from the R, G, B phosphors 6a, 6b, 6c, that is, on the viewer side of the phosphor portion 6. A third optical filter) may be arranged. Thereby, the color purity can be controlled and an image with higher color purity can be displayed.

  In this embodiment, the R, G, B phosphors 6a, 6b, 6c are not provided with a protective film. However, when using R, G, B phosphors that are vulnerable to environmental changes such as temperature, R, G In order to prevent moisture from entering the phosphors, moisture-proof coatings may be applied to the R, G, and B phosphors. The moisture-proof coating can suppress chemical changes of the R, G, and B phosphors, and can prevent deterioration in conversion efficiency.

  In the present embodiment, projectors 1 to 3 are arranged in the horizontal direction as viewed from the observer side, but may be arranged in the vertical direction. In this case, the screen 30 may be rotated 90 degrees around the horizontal axis as compared with the embodiment.

  In the present embodiment, the projectors 1 to 3 are arranged independently, but in order to increase the accuracy with respect to the image formation on the screen 30, the projectors 1 to 3 are integrated with each other using die casting or the like. Since the positional accuracy can be improved by manufacturing the image, the image can be formed on the screen 30 with higher accuracy. At the same time, the manufacturing cost of the projection display device can be reduced.

  In this embodiment, DMD is used as the light valve 17, but the same effect can be obtained even if an LCD such as a transmissive LCD or a reflective LCD is used as the light valve 17. However, in this case, it is necessary to increase the utilization efficiency of the light source by aligning the direction of polarization by using PS conversion or the like in the illumination system.

  In the present embodiment, the light source 11 is provided in each of the projectors 1 to 3. However, an excitation light source for providing one light source in common to the projectors 1 to 3 and distributing light output from the light source to the projectors 1 to 3. A distribution optical system may be provided. Distributing the light from one light source causes the luminance drop due to the deterioration of the light source to be reduced at the same ratio, not R, G, B independently, so the balance of R, G, B is lost and the white balance changes The change in hue can be eliminated.

  In the present invention, the embodiments can be appropriately modified and omitted within the scope of the invention.

  1 blue projector, 2 green projector, 3 red projector, 4 Fresnel lens, 5 lenticular lens, 6a R phosphor, 6b G phosphor, 6c B phosphor, 6d light shield, 11 light source, 20 video signal processing circuit, 30 screen .

Claims (11)

An excitation light source;
A first projector that emits excitation light that is intensity-modulated with respect to light output from the excitation light source using an R signal of a video signal;
A second projector that emits excitation light intensity-modulated using the G signal of the video signal for the light output from the excitation light source;
A third projector that emits excitation light that is intensity-modulated with respect to light output from the excitation light source using a B signal of the video signal;
A Fresnel lens on which excitation light emitted from the first to third projectors enters, and a condensing point determined for each projector by the excitation light from the first to third projectors emitted from the Fresnel lens. The lenticular lens that condenses light and the excitation light that is arranged at the condensing point determined for each projector and is condensed using the lenticular lens is converted into visible light of R, G, and B, respectively. A screen having R, G, B phosphors emitting light;
A projection display device. The first to third projectors are arranged so that their emission positions are aligned on the same axis parallel to the arrangement direction of the R, G, B phosphors in one pixel,
The projection display device according to claim 1, wherein the Fresnel lens converts excitation light from a projector disposed in the center of the first to third projectors into parallel light. The excitation light source is provided in common for the first to third projectors,
The projection display device according to claim 1, further comprising an excitation light source distribution optical system for distributing light output from the excitation light source to the first to third projectors.   The projection display device according to claim 1, wherein the excitation light source is a laser light source that outputs light having a wavelength of 405 nm.   The projection display device according to claim 1, wherein each of the first to third projectors includes a distortion correction circuit that electrically corrects a projection distortion, a position, and a screen size of an optical system.   The projection display device according to claim 1, wherein the screen further includes a light shielding unit that absorbs light at a boundary between the R, G, and B phosphors.   A first optical filter that is disposed on the opposite side of the lenticular lens with respect to the R, G, and B phosphors and that transmits visible light of each of the R, G, and B and reflects excitation light; The projection display device according to claim 1.   A second optical filter that is disposed between the lenticular and the R, G, B phosphor and that transmits excitation light and reflects visible light of each of R, G, B is further provided. 1. A projection display device according to 1.   The projection display device according to claim 1, wherein the R, G, B phosphor is provided with a moisture-proof coating.   The projection display according to claim 1, wherein the R, G, and B phosphors are applied to an emission side of the lenticular lens, and the lenticular lens has a thickness equal to its focal length. apparatus.   2. The projection type according to claim 1, further comprising a third optical filter that is disposed on the opposite side of the lenticular lens with respect to the R, G, and B phosphors and that limits a wavelength of light emitted from the phosphors. Display device.

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