JP2006058433A - Display device and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To more efficiently utilize light by using a direct-view-type liquid crystal display device. <P>SOLUTION: A light source 91 emits a light ray. A polarization converting element 93 converts a light ray with a polarization direction different from that of a light ray transmitted by the liquid crystal display device into a light ray with a polarization direction identical to that of the light ray transmitted by the liquid crystal display device. A light pipe 94 uniformizes an intensity distribution of the light ray on a plane perpendicular to the advancing direction of the light ray. A projection lens 72 projects a uniformized light ray with a polarization direction identical to that of the light ray transmitted by the liquid crystal display device on the liquid crystal display device. The method is applicable to a display device utilizing the direct-view-type liquid crystal display device. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a display device and method, and more particularly, to a display device and method capable of improving light utilization efficiency.

  In recent years, projection television receivers using liquid crystals, so-called projectors, have become widespread. As a projector using liquid crystal, there is a so-called rear projector, a rear projection television receiver that projects light (light) for displaying an image from the rear of a screen.

  A conventional rear projector reflects light emitted from a light source using a reflecting plate and enters the liquid crystal display device (see, for example, Patent Document 1). In this rear projector, light incident on the liquid crystal display device and transmitted through the liquid crystal display device is further irradiated (projected) onto the screen via the polarizing plate and the projection lens.

  However, in the rear projector, the light transmitted through the liquid crystal display device is further irradiated onto the screen via an optical system such as a polarizing plate and a projection lens, and the light irradiated on the screen is diffused, so that the viewing angle is increased. Since it is narrow, a device for widening the viewing angle is necessary.

  On the other hand, so-called liquid crystal television receivers using a direct-view type liquid crystal display device with a wide viewing angle and high brightness are also rapidly spreading. FIG. 1 is a diagram showing a configuration of a so-called liquid crystal television receiver using a conventional direct-view type liquid crystal display device.

  In the figure, W11 and W12 represent paths along which light emitted from the cold cathode tube lamp 11 travels.

  The light emitted from the cold-cathode tube lamp 11 is reflected by the reflecting plate 12 and enters the light guide plate 13 or directly enters the light guide plate 13 without being reflected by the reflecting plate 12. The reflection plate 12 is disposed so as to cover the periphery of the cold cathode tube lamp 11 and the light guide plate 13, reflects light, and causes light to enter the light guide plate 13. The light incident on the light guide plate 13 is reflected by the side surface of the light guide plate 13 or the reflection plate 12 and enters the diffusion sheet 14. The light incident on the diffusion sheet 14 is diffused and enters the liquid crystal display device 15.

  Since a polarizing filter (not shown) is disposed on the incident surface of the liquid crystal display device 15, only light having a predetermined polarization direction enters the liquid crystal display device 15.

  Therefore, for example, when the light emitted from the cold cathode tube lamp 11 travels through the optical path represented by W 11, the emitted light is reflected by the reflecting plate 12 and enters the light guide plate 13. Since the light is incident on the side surface of the light guide plate 13 at an angle smaller than the total reflection angle, the light is transmitted through the light guide plate 13. The light transmitted through the light guide plate 13 is reflected by the reflection plate 12 and enters the light guide plate 13 again. Since the light incident on the light guide plate 13 enters the side surface of the light guide plate 13 at an angle smaller than the total reflection angle, the light passes through the light guide plate 13 and enters the diffusion sheet 14.

  The light incident on the diffusion sheet 14 is diffused and enters the liquid crystal display device 15. The liquid crystal display device 15 displays a predetermined image using incident light (as a backlight). At this time, light that is not incident on the liquid crystal display device 15 is absorbed by the polarizing filter.

  In addition, when the light emitted from the cold cathode tube lamp 11 travels through the optical path represented by W12, the emitted light is not reflected by the reflecting plate 12 but directly enters the light guide plate 13. Since the light is incident on the side surface of the light guide plate 13 at an angle equal to or greater than the total reflection angle, the light is totally reflected on the side surface of the light guide plate 13. The totally reflected light is reflected by the light guide plate 13 or the reflection plate 12 and enters the liquid crystal display device 15 via the diffusion sheet 14.

  Thus, the light emitted from the cold cathode tube lamp 11 is uniformly diffused by the light guide plate 13 and the diffusion sheet 14 and enters the liquid crystal display device 15. The liquid crystal display device 15 displays a predetermined image using the incident light. By doing so, the uniformly diffused light (backlight) can be incident on the liquid crystal display device 15, and an image with uniform image quality can be displayed.

JP-A-11-176229

  However, with the demand for larger liquid crystal display devices and higher brightness, higher brightness light is required. In the above-described technology, the liquid crystal can be obtained simply by increasing the number of light sources or increasing the size of the light sources. In addition to being unable to cope with an increase in the size and brightness of the display device, there is a problem that the power consumption of the light source increases and the environmental load increases.

  Therefore, a method of correcting the polarization direction and the emission angle of light using a sheet called a functional film has been proposed. However, the control (correction) of the light emission angle using the light guide plate cannot intentionally control the path through which the light travels, and if the liquid crystal display device is enlarged, it is more difficult to suppress uneven brightness and the like. Therefore, there is a problem that it is not suitable for a large liquid crystal display device.

  Furthermore, when correcting the polarization direction and the emission angle of light, there is a problem that the cost is increased because an additional optical component is required.

  Therefore, in a display device using a direct-view liquid crystal display device, it has been very difficult to achieve both a large screen and high brightness.

  The present invention has been made in view of such a situation, and by using a direct-view type liquid crystal display device, it is possible to improve light utilization efficiency and achieve both a large screen and high brightness. It is something that can be done.

  The display device of the present invention includes a direct-view liquid crystal display device that transmits a light beam having a predetermined polarization direction, a light source that emits a light beam, and a light beam having a polarization direction different from the polarization direction of the light beam transmitted by the liquid crystal display device. The liquid crystal display device transmits the conversion means for converting the light with the same polarization direction as the light transmitted through the display device, the uniformizing means for uniformizing the intensity distribution of the light in a plane orthogonal to the traveling direction of the light, and the liquid crystal display device. Projection means for projecting a light beam from a uniformized light source having the same polarization direction as that of the light beam onto a liquid crystal display device.

  The homogenizing means can make the intensity distribution uniform in a plane orthogonal to the traveling direction of the light beam emitted from the converting means.

  The display device can further include collimation means for collimating the light beam projected from the projection means onto the liquid crystal display device to collimate.

  The display device can further include bending means for bending the optical axis of the light beam projected from the projection means.

  The display device may further include a reflection unit that reflects the light beam projected from the projection unit.

  In the display device, the light source emits light of each of the three primary colors of light, and the conversion means emits light of each of the three primary colors of light and has a polarization direction different from the polarization direction of the light beam transmitted by the liquid crystal display device. Each of the light rays is converted into each of the light rays having the same polarization direction as that of the light ray transmitted by the liquid crystal display device, and the uniformizing means is configured to emit light of each of the three primary colors of light in a plane orthogonal to the light traveling direction. The projection means can project each of the three primary color rays of the converted and uniformized light onto the liquid crystal display device.

  In the display device, the light source emits light of each of the three primary colors of light, and the conversion means has all of the light beams of the three primary colors of light and has a polarization direction different from the polarization direction of the light beams transmitted by the liquid crystal display device. The light beam is converted into a light beam having the same polarization direction as that of the light beam transmitted by the liquid crystal display device, and the uniformizing means converts the intensity distribution of all the light beams of the three primary colors in a plane perpendicular to the light beam traveling direction. The homogenizing and projecting means can project all of the three primary color rays of the converted and homogenized light onto the liquid crystal display device.

  According to the display method of the display device of the present invention, a light beam that emits a light beam and has a polarization direction different from the polarization direction of the light beam transmitted by the liquid crystal display device is converted into a light beam having the same polarization direction as the polarization direction of the light beam transmitted by the liquid crystal display device. Converting, uniformizing the intensity distribution of the light beam in a plane orthogonal to the traveling direction of the light beam, and projecting the uniformed light beam having the same polarization direction as that of the light beam transmitted by the liquid crystal display device onto the liquid crystal display device. Features.

  In the display apparatus and method of the present invention, light rays are emitted, and light rays having a polarization direction different from the polarization direction of light rays transmitted by the liquid crystal display device are converted into light rays having the same polarization direction as the light polarization direction transmitted by the liquid crystal display device. The light intensity distribution in the plane orthogonal to the traveling direction of the light beam is converted, and the uniform light beam having the same polarization direction as that of the light beam transmitted by the liquid crystal display device is projected onto the liquid crystal display device. .

  According to the present invention, it is possible to provide a display device with higher light utilization efficiency.

  Embodiments of the present invention will be described below. The correspondence relationship between the invention described in this specification and the embodiments of the invention is exemplified as follows. This description is intended to confirm that the embodiments supporting the invention described in this specification are described in this specification. Therefore, although there is an embodiment which is described in the embodiment of the invention but is not described here as corresponding to the invention, it means that the embodiment is not It does not mean that it does not correspond to the invention. Conversely, even if an embodiment is described herein as corresponding to an invention, that means that the embodiment does not correspond to an invention other than the invention. Absent.

  Further, this description does not mean all the inventions described in this specification. In other words, this description is for the invention described in the present specification, which is not claimed in this application, that is, for the invention that will be applied for in the future or that will appear and be added by amendment. It does not deny existence.

  The display device according to claim 1 includes a direct-view type liquid crystal display device that transmits a light beam having a predetermined polarization direction (for example, the liquid crystal display device 33 in FIG. 2), and a light source that emits the light beam (for example, the light source in FIG. 4). 91) and conversion means (for example, the polarization shown in FIG. 4) that converts a light beam having a polarization direction different from the polarization direction of the light beam transmitted by the liquid crystal display device into a light beam having the same polarization direction as that of the light beam transmitted by the liquid crystal display device. Conversion element 93), uniformizing means (for example, light pipe 94 in FIG. 4) for uniformizing the intensity distribution of the light beam in a plane orthogonal to the traveling direction of the light beam, and the same polarization direction of the light beam transmitted by the liquid crystal display device Projection means (for example, a projection lens 72 in FIG. 4) for projecting a light beam from a uniformized light source in the polarization direction onto a liquid crystal display device.

  In the display device according to claim 2, the uniformizing means (for example, the light pipe 94 in FIG. 4) is a plane orthogonal to the traveling direction of the light beam emitted from the converting means (for example, the polarization conversion element 93 in FIG. 4). The intensity distribution in is uniform.

  The display device according to claim 3 collimates by collimating light rays projected from a projection means (for example, the projection lens 72 in FIG. 4) onto a liquid crystal display device (for example, the liquid crystal display device 33 in FIG. 2). It further comprises collimation means (for example, a Fresnel lens 32 in FIG. 2) that uses light rays.

  The display device according to claim 4 further includes bending means (for example, diffraction optical element 121 in FIG. 5) for bending the optical axis of the light beam projected from the projection means (for example, projection lens 72 in FIG. 4). It is characterized by that.

  The display device according to claim 5 further includes a reflection unit (for example, a reflection mirror 141 in FIG. 6) that reflects a light beam projected from the projection unit (for example, the projection lens 72 in FIG. 4). .

  In the display device according to claim 6, the light source (for example, the light source 91 in FIG. 4) emits light beams of the three primary colors of light, and the conversion unit (for example, the polarization conversion element 93 in FIG. 4) Polarization of light beams transmitted by the liquid crystal display device, which are light beams of the three primary colors, each having a polarization direction different from the polarization direction of the light beams transmitted by the liquid crystal display device (for example, the liquid crystal display device 33 in FIG. 8). The light is converted into each of the light beams having the same polarization direction as the direction, and the uniformizing means (for example, the light pipe 94 in FIG. 4) converts the intensity distributions of the light beams of the three primary colors of light in a plane orthogonal to the light traveling direction. The uniformizing and projecting means (for example, the projection lens 72 in FIG. 4) projects each of the three primary color rays of the converted and uniformized light onto the liquid crystal display device.

  In the display device according to claim 7, the light source (for example, LED 201-1 to LED 201-3 in FIG. 7) emits light beams of the three primary colors of light, and conversion means (for example, the polarization conversion element in FIG. 7). 204) indicates all of the three primary colors of light, and the liquid crystal display device transmits light having a polarization direction different from the polarization direction of the light transmitted by the liquid crystal display device (for example, the liquid crystal display device 33 in FIG. 8). The light beam is converted into a light beam having the same polarization direction as that of the light beam, and the uniformizing means (for example, the light pipe 203 in FIG. 7) has the intensity of all the light beams of the three primary colors in the plane orthogonal to the light beam traveling direction. The distribution is made uniform, and the projection means (for example, the projection lens 182 in FIG. 7) projects all of the three primary color rays of the converted and uniform light onto the liquid crystal display device.

  The display method according to claim 8 emits a light beam (for example, operation of the light source 91 described with reference to FIG. 4), and transmits a light beam having a polarization direction different from the polarization direction of the light beam transmitted by the liquid crystal display device. The light is converted into a light beam having the same polarization direction as that of the light beam transmitted by the display device (for example, the operation of the polarization conversion element 93 described with reference to FIG. 4), and the light intensity distribution in a plane orthogonal to the light traveling direction. (For example, the operation of the light pipe 94 described with reference to FIG. 4), and a uniformed light beam having the same polarization direction as the light beam transmitted by the liquid crystal display device is projected onto the liquid crystal display device ( For example, the projection lens 72 is described with reference to FIG.

  The present invention can be applied to a display device using a direct view type liquid crystal display device.

  First, a first embodiment to which the present invention is applied will be described.

  FIG. 2 is a diagram showing an example of the configuration of the display device according to the present invention.

  The display device is configured to include a projection unit 31, a Fresnel lens 32, and a liquid crystal display device 33. In the drawing, the arrows indicate the optical paths of light.

  The projection unit 31 projects linearly polarized light having a uniform light intensity (luminance) distribution onto the Fresnel lens 32. Although details of the projection unit 31 will be described later, the projection unit 31 projects light emitted from a built-in light source through a predetermined optical system, thereby generating linearly polarized light with a uniform light intensity distribution. Light is projected onto the Fresnel lens 32.

  The Fresnel lens 32 is disposed at a position close to the liquid crystal display device 33, and collimates the light projected by the projection unit 31 to convert it into parallel rays. The converted parallel rays are incident on the liquid crystal display device 33. Incident perpendicular to the side end face. That is, the Fresnel lens 32 projects the converted parallel light beam and causes the parallel light beam to enter the incident side end face of the liquid crystal display device 33. Therefore, parallel light rays, which are linearly polarized light with a uniform light intensity distribution, are incident on the incident-side end face of the liquid crystal display device 33. Details of the Fresnel lens 32 will be described later.

  The liquid crystal display device 33 transmits light having a predetermined intensity (predetermined ratio) and a predetermined wavelength (colored light) for each pixel out of light incident from the incident side end face. This is a liquid crystal display device. The liquid crystal display device 33 is a so-called direct view type liquid crystal display device.

  The liquid crystal display device 33 is disposed such that the end surface on the incident side of the liquid crystal display device 33 is perpendicular to the optical axis (not shown) of the light projected from the projection unit 31. The liquid crystal display device 33 displays a predetermined image using the parallel light incident through the Fresnel lens 32 (as a backlight). A polarizing filter (not shown) is disposed on the incident-side end face of the liquid crystal display device 33, and the polarizing filter transmits only parallel light beams having a predetermined polarization direction among parallel light beams projected from the Fresnel lens 32. Let

  In this way, the display device collimates the light projected by the projection unit 31 with the Fresnel lens 32 and converts it into parallel rays. Then, the display device causes the parallel light beam converted by the Fresnel lens 32 to enter perpendicularly to the end surface on the incident side of the liquid crystal display device 33.

  The display device collimates the light projected by the projection unit 31 with the Fresnel lens 32 and converts the light into parallel light, thereby allowing the parallel light to enter perpendicularly to the incident side end face of the liquid crystal display device 33. it can. Therefore, more light can be incident on the liquid crystal display device 33, and the light utilization efficiency can be improved.

  Further, since the display device displays a predetermined image on the liquid crystal display device 33 using the parallel light rays incident through the Fresnel lens 32, an image with uniform image quality can be displayed with better light utilization efficiency. It is possible to display, and it is possible to achieve both an increase in screen size and an increase in luminance.

  Next, the Fresnel lens 32 will be described with reference to FIG.

  In the figure, W51-1 to W51-5 represent optical paths of light incident by the projection unit 31.

  The end surface 51 on the incident side of the Fresnel lens 32 is a plane perpendicular to the optical axis (not shown) of the light projected by the projection unit 31. Further, the end surface on the exit side of the Fresnel lens 32 has a portion 52-1 parallel to the end surface 51 on the incident side (hereinafter referred to as a parallel portion 52-1) and inclined portions 52-2 to 52-5 (hereinafter referred to as “in parallel portions”). , Referred to as inclined portions 52-2 to 52-5).

  Light spreading outward is incident on the incident-side end face 51 of the Fresnel lens 32 around the optical path W51-1. Therefore, for example, the light traveling on the optical path W51-1 is incident on the end surface 51 perpendicularly, and is emitted from the parallel part 52-1 perpendicularly to the parallel part 52-1.

  The light traveling on the optical path W51-2 is incident on the end surface 51 at an angle, refracted at the end surface 51 and the inclined portion 52-2, and perpendicular to the parallel portion 52-1 from the inclined portion 52-2. Exit. The light traveling along the optical path W51-3 is incident on the end surface 51 at an angle, refracted at the end surface 51 and the inclined portion 52-3, and emitted from the inclined portion 52-3 perpendicularly to the parallel portion 52-1. .

  The light traveling on the optical path W51-4 is incident on the end surface 51 at an angle, refracted at the end surface 51 and the inclined portion 52-4, and perpendicular to the parallel portion 52-1 from the inclined portion 52-4. Exit. The light traveling on the optical path W51-5 is incident on the end surface 51 at an angle, refracted at the end surface 51 and the inclined portion 52-5, and emitted from the inclined portion 52-5 perpendicularly to the parallel portion 52-1. .

  In this way, the Fresnel lens 32 converts the light incident from the projection unit 31 into parallel light beams, and causes the converted parallel light beams to enter the liquid crystal display device 33 arranged in proximity.

  As described above, the Fresnel lens 32 causes the parallel light to enter the light perpendicularly to the incident-side end face of the liquid crystal display device 33 that is disposed in the vicinity, so that more light is incident on the liquid crystal display device 33. The light can be incident, and the light use efficiency can be improved. In addition, since the light incident from the projection unit 31 can be converted into parallel rays by the Fresnel lens 32, the light can be incident on the liquid crystal display device 33 with less loss (without reducing the amount of light). it can.

  FIG. 4 is a diagram illustrating a more detailed configuration of the projection unit 31. In the drawing, an arrow represents an optical path of light.

  The projection unit 31 is configured to include a polarized light beam generation unit 71 and a projection lens 72.

  The projection unit 31 causes the light emitted from the polarized light generation unit 71 to enter the projection lens 72. The projection lens 72 diverges the light emitted by the polarized light generation unit 71 and projects it onto the Fresnel lens 32.

  The polarized light generation unit 71 includes a light source 91, a parabolic mirror 92, a polarization conversion element 93, a light pipe 94, and a field lens 95.

  The light source 91 includes, for example, a discharge tube lamp (arc lamp) such as a high-pressure mercury lamp, a xenon lamp, or a metal halide lamp, and emits white light. The light emitted from the light source 91 directly enters the polarization conversion element 93 or is reflected by the parabolic mirror 92 and enters the polarization conversion element 93.

  Note that a solid light-emitting element such as an LED (Light Emitting Diode) may be used as the light source 91. In this case, the projection part 31 can also be set as the structure similar to the projection part 161 shown in FIG. 7 mentioned later, for example. In addition, an optical system such as a lens may be disposed between the light source 91 and the polarization conversion element 93 in order to make the light emitted from the light source 91 enter the polarization conversion element 93 efficiently. In this case, the light emitted from the light source 91 is collimated in an optical system such as a lens and converted into parallel rays.

  The parabolic mirror 92 reflects the light emitted from the light source 91, and makes the light incident perpendicularly to the incident side end face of the polarization conversion element 93. In general, the parabolic mirror 92 has a reflecting surface having the same shape as a part of the rotating paraboloid.

  The light emitted from the light source 91 may be reflected using not only the parabolic mirror 92 but also an elliptical mirror. In this case, for example, an optical system such as a lens is disposed between the light source 91 and the polarization conversion element 93, and light is incident perpendicularly to the end surface on the incident side of the polarization conversion element 93.

  The polarization conversion element 93 converts the polarization direction of the incident light into the same direction as the polarization direction of the incident-side polarization filter included in the liquid crystal display device 33 to generate linearly polarized light (linearly polarized light). . The polarization conversion element 93 causes the generated linearly polarized light to enter the light pipe 94. For example, the polarization conversion element 93 is composed of a polarization beam splitter and a half-wave plate. For example, the polarization beam splitter transmits P-polarized light and makes it incident on the light pipe 94. The polarization beam splitter reflects S-polarized light and makes it incident on the half-wave plate. The half-wave plate converts the incident S-polarized light into P-polarized light, and causes the converted P-polarized light to enter the light pipe 94. At this time, for example, the polarization conversion element 93 causes the linearly polarized light to be incident on the incident side end surface of the light pipe 94 at an incident angle at which the converted linearly polarized light is totally reflected on the side surface of the light pipe 94.

  The light pipe 94 makes the intensity distribution of the light incident from the polarization conversion element 93 uniform on a surface orthogonal to the traveling direction of the light, and makes the light with the uniform intensity distribution incident on the field lens 95. For example, the light pipe 94 is a rectangular parallelepiped transparent rod lens, and the end surface on the emission side has a shape similar to that of the liquid crystal display device 33. The light pipe 94 makes the intensity distribution of the incident light uniform by totally reflecting the light incident from the end surface on the incident side on the side surface. The light pipe 94 emits light having a uniform intensity distribution from the end face on the emission side, and enters the field lens 95. In this case, the light pipe 94 emits light having a uniform intensity distribution of emitted light from the end face on the exit side from the end face on the exit side. In other words, the light pipe 94 divides the light beam incident from the polarization conversion element 93 into a plurality of light beams by total reflection on the side surface, and the light beams from the plurality of light source images generated by dividing the light beam. The light enters the field lens 95.

  The field lens 95 collects the light incident from the light pipe 94 and causes the collected light to enter the projection lens 72 so that the intensity of the light does not decrease. The field lens 95 is not limited to a single lens, but may be an optical system including a plurality of lenses. Further, it is possible to incorporate the function into the projection lens 72 without providing the field lens 95.

  The projection lens 72 diverges the light incident from the field lens 95 and causes the diverged light to enter (project) the Fresnel lens 32. That is, the projection lens 72 diverges the light incident from the field lens 95 so that the light beam spreads at a predetermined angle with respect to the optical axis, and projects the diverged light onto the Fresnel lens 32.

  In this way, the projection unit 31 converts the polarization direction of the emitted light and generates linearly polarized light having a predetermined polarization direction. Then, the projection unit 31 makes the intensity distribution of the generated linearly polarized light uniform and makes it incident on the Fresnel lens 32.

  Thus, the projection unit 31 can improve the light utilization efficiency by causing the emitted light to enter the Fresnel lens 32 through the optical system with little light loss. The projection unit 31 converts the emitted light into a polarization conversion element 93 by changing the polarization direction of the light to the same direction as the polarization direction of the incident-side polarization filter included in the liquid crystal display device 33. More light can be incident on the display device 33.

  Furthermore, the projection unit 31 can make the light having a uniform intensity distribution incident on the Fresnel lens 32 by making the intensity distribution of the emitted light uniform in the light pipe 94. It has been described that the emitted light is incident on the light pipe 94 to make the light intensity distribution uniform. However, the present invention is not limited to the light pipe 94, and for example, a microlens array called a fly eye may be used. Good.

  In this case, for example, two microlens arrays in which the same microlens is arranged in the vertical direction and the horizontal direction are arranged so as to face each other. At this time, the light (light beam) incident on the microlens array disposed on the polarization conversion element 93 side is divided into a plurality of light beams having a small aperture by a plurality of microlenses constituting the microlens array, and a plurality of light source images. Occurs. The microlens array on the field lens 95 side collects the divided light and makes the collected light enter the field lens 95. Thus, by dividing the incident light into a plurality of lights, the light intensity distribution can be made uniform.

  As described above, the display device can improve the light use efficiency by allowing the parallel light rays to enter perpendicularly to the incident-side end face of the liquid crystal display device through the optical system with little light loss. it can. In addition, the display device can improve the light use efficiency by converting the polarization direction of the light to be projected into the same direction as the polarization direction of the incident-side polarization filter included in the liquid crystal display device. .

  Furthermore, since the display device displays a predetermined image on the liquid crystal display device using the parallel light incident through the Fresnel lens, it displays an image with uniform image quality with better light utilization efficiency. Therefore, it is possible to achieve both a large screen and high brightness.

  The light projected by the projection unit 31 has been described as being incident on the liquid crystal display device 33 via the Fresnel lens 32. However, the light may be directly incident on the liquid crystal display device 33 without passing through the Fresnel lens 32. .

  Next, a second embodiment to which the present invention is applied will be described.

  FIG. 5 is a diagram showing an example of the configuration of the display device according to the present invention. In the figure, the portions corresponding to those in FIG. 2 are denoted by the same reference numerals, and will be repeated. Therefore, the description thereof will be omitted as appropriate.

  The display device is configured to include a projection unit 31, a Fresnel lens 32, a liquid crystal display device 33, and a diffraction optical element 121. In the drawing, the arrows indicate the optical paths of light.

  The projection unit 31 projects linearly polarized light having a uniform light intensity distribution onto the diffraction optical element 121. The projection unit 31 is arranged so that the projected light is incident on the incident side end face of the diffraction optical element 121 obliquely.

  The diffractive optical element 121 is disposed at a position close to the Fresnel lens 32. The diffraction optical element 121 includes, for example, a diffraction optical element (DOE (Diffractive Optical Element)) such as a grating lens or a holographic optical element. The diffraction optical element 121 diffracts the light projected by the projection unit 31, and the diffracted light is Fresnel. The light enters the lens 32.

  The Fresnel lens 32 is disposed at a position close to the liquid crystal display device 33, and collimates the light incident from the diffractive optical element 121 to convert it into parallel rays, and the converted parallel rays are converted into the liquid crystal display device 33. Incident perpendicular to the incident end face. That is, the Fresnel lens 32 projects the converted parallel light beam and causes the parallel light beam to enter the incident side end face of the liquid crystal display device 33. Therefore, parallel light rays, which are linearly polarized light with a uniform light intensity distribution, are incident on the incident-side end face of the liquid crystal display device 33.

  In this way, the display device causes the light projected by the projection unit 31 to be diffracted by the diffractive optical element 121 and enter the Fresnel lens 32. In the Fresnel lens 32, the incident light is collimated and converted into a parallel light beam, so that the parallel light beam enters the end face on the incident side of the liquid crystal display device 33 perpendicularly.

  As described above, the display device diffracts the light projected by the projection unit 31 by the diffractive optical element 121 and converts the light into parallel rays by the Fresnel lens 32, so that the liquid crystal display device 33 has an incident-side end surface. Thus, parallel light rays can be incident vertically. Therefore, more light can be incident on the liquid crystal display device 33, and the light utilization efficiency can be improved.

  Further, since the display device displays a predetermined image on the liquid crystal display device 33 using the parallel light rays incident through the Fresnel lens 32, an image with uniform image quality can be displayed with better light utilization efficiency. It is possible to display, and it is possible to achieve both an increase in screen size and an increase in luminance.

  As described above, the display device can improve the light use efficiency by allowing the parallel light rays to enter perpendicularly to the incident-side end face of the liquid crystal display device through the optical system with little light loss. it can. In addition, since the display device displays a predetermined image on the liquid crystal display device using parallel rays incident through the Fresnel lens, it displays an image with uniform image quality with better light utilization efficiency. Therefore, it is possible to achieve both a large screen and high brightness.

  Next, a third embodiment to which the present invention is applied will be described.

  FIG. 6 is a diagram showing an example of the configuration of the display device according to the present invention. In the figure, the portions corresponding to those in FIG. 2 are denoted by the same reference numerals, and will be repeated. Therefore, the description thereof will be omitted as appropriate.

  The display device is configured to include a projection unit 31, a Fresnel lens 32, a liquid crystal display device 33, and a reflection mirror 141. In the drawing, the arrows indicate the optical paths of light.

  The projection unit 31 projects linearly polarized light having a uniform light intensity distribution onto the reflection mirror 141. The projection unit 31 is arranged so that the projected light is incident on the reflection surface of the reflection mirror 141 obliquely.

  The reflection mirror 141 is, for example, a total reflection mirror having a flat reflection surface, totally reflects light projected from the projection unit 31, and causes the totally reflected light to enter the Fresnel lens 32. In addition, although the reflective mirror 141 demonstrated that the reflective surface was a plane, it is good also as a reflective mirror with a concave reflective surface.

  The Fresnel lens 32 is disposed at a position close to the liquid crystal display device 33, and collimates the light incident from the reflection mirror 141 to convert it into parallel light, and the converted parallel light is incident on the liquid crystal display device 33. Incident perpendicular to the side end face. That is, the Fresnel lens 32 projects the converted parallel light beam and causes the parallel light beam to enter the incident side end face of the liquid crystal display device 33. Therefore, parallel light rays, which are linearly polarized light with a uniform light intensity distribution, are incident on the incident-side end face of the liquid crystal display device 33.

  In this way, the display device causes the light projected by the projection unit 31 to be reflected by the reflection mirror 141 and incident on the Fresnel lens 32. The incident light is collimated by the Fresnel lens 32 to be converted into parallel rays. Further, in the Fresnel lens 32, the converted parallel light beam is incident perpendicularly to the incident side end face of the liquid crystal display device 33.

  The display device can reduce the thickness (depth) of the display device by reflecting the light projected by the projection unit 31 at the reflection mirror 141. Further, the display device collimates incident light at the Fresnel lens 32 and converts the collimated light into parallel rays, whereby the parallel rays can be incident perpendicularly to the end surface on the incident side of the liquid crystal display device 33. Therefore, more light can be incident on the liquid crystal display device 33, and the light utilization efficiency can be improved.

  Furthermore, since the display device displays a predetermined image on the liquid crystal display device 33 using the parallel light rays incident through the Fresnel lens 32, an image with uniform image quality can be displayed with better light utilization efficiency. It is possible to display, and it is possible to achieve both an increase in screen size and an increase in luminance.

  As described above, the display device can improve the light use efficiency by allowing the parallel light rays to enter perpendicularly to the incident-side end face of the liquid crystal display device through the optical system with little light loss. it can. In addition, since the display device displays a predetermined image on the liquid crystal display device using parallel rays incident through the Fresnel lens, it displays an image with uniform image quality with better light utilization efficiency. Therefore, it is possible to achieve both a large screen and high brightness.

  Although the light projected by the projection unit 31 has been described as being reflected by the reflection mirror 141, a plurality of reflection mirrors 141 may be provided. Further, the diffraction optical element may be arranged at a position between the Fresnel lens 32 and the reflection mirror 141 and in a position close to the Fresnel lens 32.

  Moreover, the projection part 31 which projects light is not restricted to the structure demonstrated with reference to FIG. 4, It can also be set as the structure shown in FIG.

  In FIG. 7, the arrow represents the optical path of light. Each of W201 to W203 represents an optical path of light emitted from each of the LEDs 201-1 to 201-3.

  The projection unit 161 is configured to include a polarized light beam generation unit 181 and a projection lens 182.

  The projection unit 161 causes the light emitted from the polarized light generation unit 181 to enter the projection lens 182. The projection lens 182 diverges the light emitted from the polarized light generation unit 181 and projects the light onto the Fresnel lens 32 or the diffraction optical element 121.

  The polarized light generation unit 181 includes LEDs 201-1 to 201-3, a dichroic prism 202, a light pipe 203, a polarization conversion element 204, and a field lens 205.

  The LED 201-1 emits red light and makes the emitted red light enter the dichroic prism 202.

  The LED 201-2 emits green light and causes the emitted green light to enter the dichroic prism 202.

  The LED 201-3 emits blue light and causes the emitted blue light to enter the dichroic prism 202. Hereinafter, when it is not necessary to distinguish each of the LEDs 201-1 to 201-3, they are simply referred to as LEDs 201.

  The dichroic prism 202 mixes the light incident from the LED 201 and generates white light. The dichroic prism 202 causes the generated white light to enter the light pipe 203. The dichroic prism 202 has a reflecting surface 221-1 and a reflecting surface 221-2 that are orthogonal to each other.

  The reflecting surface 221-1 of the dichroic prism 202 totally reflects red light and transmits blue light and green light. The reflecting surface 221-2 of the dichroic prism 202 totally reflects blue light and transmits red light and green light.

  That is, the reflecting surface 221-1 of the dichroic prism 202 totally reflects the red light emitted from the LED 201-1, and causes the totally reflected red light to enter the light pipe 203. Therefore, for example, red light emitted from the LED 201-1 enters the light pipe 203 through the optical path indicated by the arrow W 201.

  Further, the reflecting surface 221-1 and the reflecting surface 221-2 of the dichroic prism 202 transmit the green light emitted from the LED 201-2 and allow the transmitted green light to enter the light pipe 203. Therefore, for example, the green light emitted from the LED 201-2 passes through the optical path indicated by the arrow W202 and enters the light pipe 203.

  Further, the reflecting surface 221-2 of the dichroic prism 202 totally reflects the blue light emitted from the LED 201-3 and causes the totally reflected blue light to enter the light pipe 203. Therefore, for example, the blue light emitted from the LED 201-3 passes through the optical path indicated by the arrow W203 and enters the light pipe 203.

  As described above, the dichroic prism 202 generates white light by mixing the light emitted from each of the LEDs 201-1 to 201-3. At this time, for example, the dichroic prism 202 causes the generated white light to enter the end surface on the incident side of the light pipe 203 at an incident angle at which the generated white light is totally reflected on the side surface of the light pipe 203.

  The light pipe 203 makes the intensity distribution of the light incident from the dichroic prism 202 uniform on a surface orthogonal to the light traveling direction, and makes the light having the uniform intensity distribution incident on the polarization conversion element 204.

  The light pipe 203 is, for example, a rectangular parallelepiped transparent rod lens. In the light pipe 203, for example, the incident-side end face has the same shape as the exit-side end face of the dichroic prism 202, and the exit-side end face has the same shape as the incident-side end face of the polarization conversion element 204. Yes. The light pipe 203 makes the incident light intensity distribution uniform by totally reflecting light incident from the end face on the incident side on the side surface. The light pipe 203 emits light having a uniform intensity distribution from the end face on the emission side and makes the light incident on the polarization conversion element 204. In this case, the light pipe 203 emits light having a uniform intensity distribution of emitted light from the end face on the exit side from the end face on the exit side. In other words, the light pipe 203 splits the light beam incident from the dichroic prism 202 into a plurality of light beams by total reflection on the side surface, and polarizes the light beams from the plurality of light source images generated by dividing the light beam. The light is incident on the conversion element 204.

  The polarization conversion element 204 converts the polarization direction of the incident light into the same direction as the polarization direction of the incident-side polarization filter included in the liquid crystal display device 33 to generate linearly polarized light. The polarization conversion element 204 causes the generated linearly polarized light to enter the field lens 205. For example, the polarization conversion element 204 includes a polarization beam splitter and a half-wave plate. For example, the polarization beam splitter transmits P-polarized light and makes it incident on the field lens 205. The polarization beam splitter reflects S-polarized light and makes it incident on the half-wave plate. The half-wave plate converts the incident S-polarized light into P-polarized light, and causes the converted P-polarized light to enter the field lens 205.

  The field lens 205 collects the light incident from the polarization conversion element 204 and causes the collected light to enter the projection lens 182 so that the intensity of the light does not decrease. The field lens 205 is not limited to a single lens, and may be an optical system including a plurality of lenses.

  The projection lens 182 diverges the light incident from the field lens 205 and causes the diverged light to enter the Fresnel lens 32 or the diffraction optical element 121.

  In this way, the projection unit 161 converts the polarization direction of the emitted light, and generates linearly polarized light having the same polarization direction as the polarization direction of the incident-side polarization filter included in the liquid crystal display device 33. Then, the projection unit 161 makes the intensity distribution of the generated linearly polarized light uniform and makes it incident on the Fresnel lens 32 or the diffraction optical element 121.

  Thus, the projection unit 161 can improve the light utilization efficiency by causing the emitted light to enter the Fresnel lens 32 or the diffraction optical element 121 through the optical system with little light loss. The projection unit 161 converts the emitted light into the same direction as the polarization direction of the incident-side polarization filter included in the liquid crystal display device 33 in the polarization conversion element 204, thereby displaying the liquid crystal display. More light can enter the device 33.

  The light source that emits each of the three primary colors of red, green, and blue is not limited to each of the LEDs 201-1 to 201-3, and a laser diode or the like may be used.

  Next, a fourth embodiment to which the present invention is applied will be described.

  FIG. 8 is a diagram showing an example of the configuration of the display device according to the present invention. In the figure, the portions corresponding to those in FIG. 2 are denoted by the same reference numerals, and will be repeated. Therefore, the description thereof will be omitted as appropriate.

  The display device is configured to include a Fresnel lens 32, a liquid crystal display device 33, and projection units 241-1 to 241-3. In the drawing, the arrows indicate the optical paths of light.

  Each of the projection units 241-1 to 241-3 projects linearly polarized light having a uniform light intensity distribution onto the Fresnel lens 32. Each of the projection units 241-1 to 241-3 incorporates LEDs that emit light of the three primary colors red, green, and blue as light sources, and the built-in light sources emit light. By projecting light through a predetermined optical system, linearly polarized light having a uniform light intensity distribution is projected onto the Fresnel lens 32.

  Therefore, for example, the projection unit 241-1 incorporates an LED that emits red light as a light source, and projects light emitted from the built-in light source through a predetermined optical system, thereby The linearly polarized light having a uniform intensity distribution is projected onto the Fresnel lens 32. The projection unit 241-2 incorporates an LED that emits green light as a light source, and projects the light emitted from the built-in light source via a predetermined optical system, thereby distributing the light intensity distribution. Are projected onto the Fresnel lens 32. Further, the projection unit 241-3 incorporates an LED that emits blue light as a light source, and projects the light emitted from the built-in light source through a predetermined optical system, thereby distributing the light intensity distribution. Are projected onto the Fresnel lens 32.

  The light sources incorporated in each of the projection units 241-1 to 241-3 are not limited to LEDs, but are laser diodes that emit red, green, and blue light of the three primary colors of light. It is also possible.

  Hereinafter, when it is not necessary to distinguish each of the projection units 241-1 to 241-3, they are simply referred to as the projection unit 241.

  The Fresnel lens 32 is disposed at a position close to the liquid crystal display device 33, and collimates the light projected by the projection unit 241 to convert it into parallel rays. The converted parallel rays are incident on the liquid crystal display device 33. Incident perpendicular to the side end face. That is, the Fresnel lens 32 projects the converted parallel light beam and causes the parallel light beam to enter the incident side end face of the liquid crystal display device 33. Therefore, parallel light rays, which are linearly polarized light with a uniform light intensity distribution, are incident on the incident-side end face of the liquid crystal display device 33.

  In this manner, the display device collimates the light projected by the projection unit 241 with the Fresnel lens 32 to convert it into parallel rays. Then, the display device causes the parallel light beam converted by the Fresnel lens 32 to enter perpendicularly to the end surface on the incident side of the liquid crystal display device 33.

  The display device collimates the light projected by the projection unit 241 with the Fresnel lens 32 and converts the light into parallel light, thereby allowing the parallel light to enter perpendicularly to the end surface on the incident side of the liquid crystal display device 33. it can. Therefore, more light can be made incident on the liquid crystal display device 33, and the light utilization efficiency can be improved.

  Further, since the display device displays a predetermined image on the liquid crystal display device 33 using the parallel light rays incident through the Fresnel lens 32, an image with uniform image quality can be displayed with better light utilization efficiency. It is possible to display, and it is possible to achieve both an increase in screen size and an increase in luminance.

  Note that each of the projection units 241-1 to 241-3 may incorporate an LED or a laser diode that emits white light as a light source.

  As described above, the display device can improve the light use efficiency by allowing the parallel light rays to enter perpendicularly to the incident-side end face of the liquid crystal display device through the optical system with little light loss. it can. In addition, the display device can improve the light use efficiency by converting the polarization direction of the light to be projected into the same direction as the polarization direction of the incident-side polarization filter included in the liquid crystal display device. .

  Furthermore, since the display device displays a predetermined image on the liquid crystal display device using the parallel light incident through the Fresnel lens, it displays an image with uniform image quality with better light utilization efficiency. Therefore, it is possible to achieve both a large screen and high brightness.

  Next, a fifth embodiment to which the present invention is applied will be described.

  FIG. 9 is a diagram showing an example of the configuration of the display device according to the present invention. In the figure, the portions corresponding to those in FIG. 2 are denoted by the same reference numerals, and will be repeated. Therefore, the description thereof will be omitted as appropriate.

  The display device is configured to include a Fresnel lens 32, a liquid crystal display device 33, a polarized light beam generation unit 261-1 to a polarized light beam generation unit 261-3, and a projection lens 262. In the drawing, the arrows indicate the optical paths of light.

  Each of the polarized light beam generation units 261-1 to 261-3 projects linearly polarized light with a uniform light intensity distribution onto the projection lens 262. For example, each of the polarized light beam generation units 261-1 to 261-3 incorporates LEDs that emit light of the three primary colors red, green, and blue as light sources. By emitting light emitted from the light source through a predetermined optical system, linearly polarized light having a uniform light intensity distribution is emitted to the projection lens 262.

  Therefore, for example, the polarized light generation unit 261-1 incorporates an LED that emits red light as a light source, and projects the light emitted from the built-in light source through a predetermined optical system. Linearly polarized light having a uniform light intensity distribution is projected onto the projection lens 262. Further, the polarized light generation unit 261-2 includes an LED that emits green light as a light source, and projects light emitted from the built-in light source through a predetermined optical system. The linearly polarized light having a uniform intensity distribution is projected onto the projection lens 262. Further, the polarized light generation unit 261-3 incorporates an LED that emits blue light as a light source, and projects the light emitted from the built-in light source through a predetermined optical system, thereby generating light. The linearly polarized light having a uniform intensity distribution is projected onto the projection lens 262.

  The light sources incorporated in each of the polarized light beam generation units 261-1 to 261-3 are not limited to LEDs, and emit light of the three primary colors red, green, and blue. It can also be a laser diode.

  Hereinafter, when it is not necessary to distinguish each of the polarized light beam generation units 261-1 to 261-3, they are simply referred to as a polarized light beam generation unit 261.

  The projection lens 262 diverges the light incident from the polarized light generation unit 261, projects the diverged light onto the Fresnel lens 32, and makes the light incident.

  The Fresnel lens 32 is disposed at a position close to the liquid crystal display device 33, and collimates the light projected by the projection lens 262 to convert it into parallel rays. The converted parallel rays are incident on the liquid crystal display device 33. Incident perpendicular to the side end face. That is, the Fresnel lens 32 projects the converted parallel light beam and causes the parallel light beam to enter the incident side end face of the liquid crystal display device 33. Therefore, parallel light rays, which are linearly polarized light with a uniform light intensity distribution, are incident on the incident-side end face of the liquid crystal display device 33.

  In this manner, the display device collimates the light projected by the projection lens 262 by the Fresnel lens 32 and converts it into parallel rays. Then, the display device causes the parallel light beam converted by the Fresnel lens 32 to enter perpendicularly to the end face of the liquid crystal display device 33.

  The display device collimates the light projected by the projection lens 262 with the Fresnel lens 32 and converts the light into parallel rays, thereby allowing the parallel rays to enter perpendicularly to the end surface on the incident side of the liquid crystal display device 33. it can. Therefore, more light can be made incident on the liquid crystal display device 33, and the light utilization efficiency can be improved. In addition, by providing one projection lens 262 for the plurality of polarized light beam generation units 261, the number of optical components can be reduced, and a lower cost display device can be provided.

  Furthermore, since the display device displays a predetermined image on the liquid crystal display device 33 using the parallel light rays incident through the Fresnel lens 32, an image with uniform image quality can be displayed with better light utilization efficiency. It is possible to display, and it is possible to achieve both an increase in screen size and an increase in luminance.

  Note that each of the polarized light beam generation units 261-1 to 261-3 may emit light of a color other than the three primary colors of light.

  As described above, the display device can improve the light use efficiency by allowing the parallel light rays to enter perpendicularly to the incident-side end face of the liquid crystal display device through the optical system with little light loss. it can. In addition, since the display device displays a predetermined image on the liquid crystal display device using parallel rays incident through the Fresnel lens, it displays an image with uniform image quality with better light utilization efficiency. Therefore, it is possible to achieve both a large screen and high brightness.

  When comparing the light use efficiency of the display device to which the present invention is applied and the light use efficiency of a conventional direct-view projector, assuming that the intensity of light emitted from the light source is 100%, the conventional direct-view type In the projector, about 60% of light incident on the liquid crystal display device and used as the backlight is used. In the display device to which the present invention is applied, 80% or more of the light is used as the backlight. It is possible.

  In addition, in the light emitted from the light source, the polarization direction is included in the liquid crystal display device, and the intensity of the light in the same direction as the polarization direction of the polarization filter disposed on the incident side of the liquid crystal display device is 100% In a conventional direct-view projector, the amount of light that is incident on a liquid crystal display device and used as a backlight is about 150%, whereas in a display device to which the present invention is applied, 170% or more of light is emitted. It can be used as a backlight.

  Therefore, according to the present invention, it can be expected to provide a display device with higher light utilization efficiency.

  According to the present invention, since the emitted light is incident on the liquid crystal display device, an image can be displayed on the display device. In addition, according to the present invention, the parallel light beam, which is a linearly polarized light beam having a uniform light intensity distribution, is incident on the liquid crystal display device via the Fresnel lens. Can be provided.

  Furthermore, according to the present invention, since a predetermined image is displayed on the liquid crystal display device using parallel rays incident through the Fresnel lens, an image with uniform image quality can be obtained with better light utilization efficiency. It is possible to display, and it is possible to achieve both an increase in screen size and an increase in luminance.

It is a figure which shows the structure of the conventional liquid crystal television receiver. It is a figure which shows the example of a structure of the display apparatus which concerns on this invention. It is a figure explaining a Fresnel lens. It is a figure which shows the more detailed structure of a projection part. It is a figure which shows the example of a structure of the display apparatus which concerns on this invention. It is a figure which shows the example of a structure of the display apparatus which concerns on this invention. It is a figure which shows the more detailed structure of a projection part. It is a figure which shows the example of a structure of the display apparatus which concerns on this invention. It is a figure which shows the example of a structure of the display apparatus which concerns on this invention.

Explanation of symbols

  31 Projection Unit, 32 Fresnel Lens, 33 Liquid Crystal Display Device, 71 Polarized Light Generation Unit, 72 Projection Lens, 91 Light Source, 93 Polarization Conversion Element, 94 Light Pipe, 121 Diffraction Optical Element, 141 Reflecting Mirror, 161 Projection Unit, 181 Polarized light generation unit, 182 projection lens, 201, 201-1 to 201-3 LED, 202 dichroic prism, 203 light pipe, 204 polarization conversion element, 221-1, 221-2 reflecting surface 241, 241-1 to 241- 3 projection unit, 261, 261-1 to 261-3 polarized light generation unit, 262 projection lens

Claims (8)

A direct-view liquid crystal display device that transmits light of a predetermined polarization direction;
A light source that emits light rays;
Conversion means for converting a light beam having a polarization direction different from the polarization direction of the light beam transmitted by the liquid crystal display device into a light beam having the same polarization direction as the polarization direction of the light beam transmitted by the liquid crystal display device;
Uniformizing means for uniformizing the intensity distribution of the light beam in a plane perpendicular to the traveling direction of the light beam;
Projection means for projecting, onto the liquid crystal display device, a uniform light beam from the light source having the same polarization direction as that of the light beam transmitted by the liquid crystal display device. The display device according to claim 1, wherein the uniformizing unit uniformizes an intensity distribution in the plane of the light beam emitted from the converting unit. The display device according to claim 1, further comprising collimation means for collimating the light beam projected from the projection means onto the liquid crystal display device. The display device according to claim 1, further comprising a bending unit that bends the optical axis of the light beam projected from the projection unit. The display device according to claim 1, further comprising a reflection unit that reflects a light beam projected from the projection unit. The light source emits light of each of the three primary colors of light,
The conversion means is each of the light beams of the three primary colors of light, each of the light beams having a polarization direction different from the polarization direction of the light beam transmitted by the liquid crystal display device, and the polarization direction of the light beam transmitted by the liquid crystal display device. Converted into each of the rays of the same polarization direction,
The uniformizing means uniformizes the intensity distribution of each of the three primary colors of light in a plane orthogonal to the traveling direction of the light,
The display device according to claim 1, wherein the projection unit projects each of the three primary color rays of the converted and uniform light onto the liquid crystal display device. The light source emits light of each of the three primary colors of light,
The converting means is the same polarized light as all the light beams of the three primary colors and having a polarization direction different from the polarization direction of the light beam transmitted by the liquid crystal display device and the polarization direction of the light beam transmitted by the liquid crystal display device. Convert to directional rays,
The homogenizing means homogenizes all intensity distributions of the three primary colors of light in a plane perpendicular to the traveling direction of the light,
The display device according to claim 1, wherein the projection unit projects all of the three primary color rays of the converted and uniform light onto the liquid crystal display device. In a display method of a display device provided with a direct-view liquid crystal display device that transmits light of a predetermined polarization direction,
Radiate rays,
A light beam having a polarization direction different from the polarization direction of the light beam transmitted by the liquid crystal display device is converted into a light beam having the same polarization direction as the polarization direction of the light beam transmitted by the liquid crystal display device;
Homogenize the intensity distribution of light rays in a plane perpendicular to the direction of travel
A display method comprising: projecting a uniform light beam having the same polarization direction as the light beam transmitted by the liquid crystal display device onto the liquid crystal display device.

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