JP2006337712A - Screen and image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screen or the like having good viewing angle property and capable of obtaining an image of high contrast, in a constitution using a microlens array. <P>SOLUTION: The screen includes; a plurality of microlens elements 41 arranged in an array state; and a black matrix layer 60 including an opening part 62 for transmitting light from the microlens elements 41 and a light shielding part 61 arranged around the opening part 62. The opening part 62 is arranged near the focal position of the microlens element 41, and regarding the black matrix layer 60, the area of the opening part 62 occupies ≥20% and ≤40% of the whole area of the black matrix layer 60. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a screen and an image display device, and more particularly to a screen technology of an image display device that displays an image by transmitting light according to an image signal.

  A so-called rear projector that displays an image by transmitting light according to an image signal (hereinafter referred to as “video light” as appropriate) uses a transmissive screen that transmits video light. When the external light reflected by the transmissive screen travels in the direction of the observer, the observer observes the image light and the external light simultaneously. When external light enters the observer's eyes simultaneously with the image light, it causes a decrease in the contrast of the image. In order to reduce such a decrease in the contrast of an image, for example, a technique for forming a black stripe on the screen for absorbing external light has been proposed. For example, Patent Document 1 proposes a technique for reducing reflection of external light by providing black stripes.

Japanese Patent Laid-Open No. 10-83029

  The black stripe is mainly used in combination with a lenticular lens sheet. The screen can be configured to use a microlens array instead of the lenticular lens sheet. A lenticular lens diffuses image light in one direction, for example, the horizontal direction, whereas a microlens element can diffuse image light in two directions, a horizontal direction and a vertical direction. For this reason, the screen can obtain good viewing angle characteristics not only in the horizontal direction but also in the vertical direction by using a microlens array instead of the lenticular lens sheet. In the case of a configuration using a microlens array, it is conceivable to use a black matrix instead of a black stripe in order to reduce reflection of external light. A black matrix has an opening part and the light-shielding part provided in the grid | lattice form. In the case of using a black matrix, it is possible to obtain a high-contrast image by advancing video light to the opening by the microlens element. However, some of the image light transmitted through the microlens element may be absorbed by the light shielding portion. When the image light absorbed by the light shielding portion increases, it is difficult to obtain a high-contrast image, which is a problem. The present invention has been made in view of the above-described problems, and an object thereof is to provide a screen and an image display device for obtaining a high-contrast image with good viewing angle characteristics in a configuration using a microlens array. And

  In order to solve the above-described problems and achieve the object, according to the present invention, a plurality of microlens elements provided in an array, an opening that transmits light from the microlens element, and the periphery of the opening A black matrix layer having a light shielding portion provided on the microlens element, the opening is provided in the vicinity of the focal position of the microlens element, and the black matrix layer has an opening portion with respect to the entire area of the black matrix layer. A screen characterized in that the area occupies 20% or more and 40% or less can be provided.

  As the area of the opening occupying the black matrix layer is increased, the image light absorbed by the light shielding portion can be reduced and the image light can be transmitted efficiently. If the area of the light-shielding part is reduced by increasing the area of the opening, the amount of external light reflected toward the viewer increases. In addition, as the area of the light-shielding portion is increased, it is possible to reduce the external light reflected toward the viewer. When the area of the opening is reduced by increasing the area of the light shielding part, the image light absorbed by the light shielding part increases. It is difficult to obtain a high-contrast image both when the area of the opening in the black matrix layer is too small and too large. The screen of the present invention limits the area of the opening occupied in the black matrix layer to 20% or more and 40% or less, thereby reducing the image light absorbed by the light shielding part and reflecting the external light toward the viewer. Also reduce. A high-contrast image can be obtained by efficiently advancing the image light toward the viewer and reducing the external light reflected toward the viewer. Thereby, in a configuration using a microlens array, a screen for obtaining a high-contrast image with good viewing angle characteristics can be obtained.

  According to a preferred aspect of the present invention, it is desirable that the light-shielding portion has a light transmittance of 0% to 40%. As the external light transmitted through the light shielding portion increases, the external light reflected toward the observer increases. In this aspect, by limiting the transmittance of the light shielding portion to 0% or more and 40% or less, the external light reflected in the direction of the observer is reduced. Thereby, an image with higher contrast can be obtained.

  According to a preferred aspect of the present invention, the opening and the microlens element have a shape in which the length in the first direction is longer than the length in the second direction substantially orthogonal to the first direction. desirable. The microlens element having a shape in which the length in the first direction is longer than the length in the second direction causes the image light to enter the irradiation region having a shape that is long in the first direction. The microlens element can efficiently allow image light to enter the opening having a shape in which the length in the first direction is longer than the length in the second direction. In addition, for example, by providing a long opening in the horizontal direction, the viewing angle characteristics in the horizontal direction can be improved. Thereby, video light can be transmitted efficiently and a good viewing angle characteristic can be obtained.

  Further, as a preferred embodiment of the present invention, it is desirable to have a diffusion layer that diffuses light, and the diffusion layer is provided in the vicinity of the black matrix layer. Due to the refracting action of the microlens element, the image light is most narrowed in the vicinity of the opening. By providing the diffusion layer in the vicinity of the black matrix layer, it becomes possible to make the image light in the most narrowed state enter the diffusion layer. For this reason, it is possible to reduce the image light that is diffused by the diffusion layer and then enters the light shielding portion, and to efficiently transmit the image light.

  According to a preferred aspect of the present invention, it is desirable that the diffusion layer is provided on the incident side of the opening or on the opening. By providing a diffusion layer on the incident side of the opening or on the opening, it is possible to reduce a decrease in contrast due to reflection of external light by the diffusion layer. Thereby, an image with higher contrast can be obtained.

  Furthermore, according to the present invention, it is possible to provide an image display device including a spatial light modulation device that modulates light from a light source unit according to an image signal and the above-described screen. Since the screen is provided, a high-contrast image can be obtained. Thereby, an image display device capable of displaying a high-contrast image can be obtained.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

  FIG. 1 shows a schematic configuration of a projector 10 that is an image display apparatus according to an embodiment of the present invention. The projector 10 is a so-called rear projector that projects light on one surface of the screen 22 and observes an image by observing light emitted from the other surface of the screen 22. The ultra-high pressure mercury lamp 11 that is a light source unit includes red light (hereinafter referred to as “R light”) that is first color light, green light (hereinafter referred to as “G light”) that is second color light, and third light. Light including blue light (hereinafter referred to as “B light”) that is colored light is supplied.

  The integrator 12 makes the illuminance distribution of the light from the extra-high pressure mercury lamp 11 substantially uniform. The light having a uniform illuminance distribution is converted by the polarization conversion element 13 into polarized light having a specific vibration direction, for example, s-polarized light. The light converted into the s-polarized light is incident on the R light transmitting dichroic mirror 14R constituting the color separation optical system. The R light transmitting dichroic mirror 14R transmits R light and reflects G light and B light. The R light transmitted through the R light transmitting dichroic mirror 14 </ b> R enters the reflection mirror 15. The reflection mirror 15 bends the optical path of the R light by 90 degrees. The R light whose optical path is bent is incident on a spatial light modulator 17R that modulates the R light according to an image signal. The spatial light modulator 17R is a transmissive liquid crystal display device that modulates R light according to an image signal. Note that even if the light passes through the dichroic mirror, the polarization direction of the light does not change. Therefore, the R light incident on the spatial light modulation device 17R remains as s-polarized light.

  The s-polarized light incident on the spatial light modulator 17R is converted into p-polarized light and then incident on a liquid crystal panel (not shown). In the liquid crystal panel, a liquid crystal layer for image display is sealed between two transparent substrates. The p-polarized light incident on the liquid crystal panel is converted into s-polarized light by modulation according to the image signal. The spatial light modulator 17R emits R light converted into s-polarized light by modulation. In this way, the R light modulated by the spatial light modulator 17R is incident on the cross dichroic prism 18 which is a color synthesis optical system.

  The G light and B light reflected by the R light transmitting dichroic mirror 14R have their optical paths bent 90 degrees. The G light and B light whose optical paths are bent enter the B light transmitting dichroic mirror 14G. The B light transmitting dichroic mirror 14G reflects the G light and transmits the B light. The G light reflected by the B light transmitting dichroic mirror 14G is incident on a spatial light modulation device 17G that modulates the G light according to an image signal. The spatial light modulator 17G is a transmissive liquid crystal display device that modulates G light according to an image signal.

  The G light incident on the spatial light modulator 17G is converted into s-polarized light. The s-polarized light incident on the spatial light modulator 17G is incident on the liquid crystal panel as it is. The s-polarized light incident on the liquid crystal panel is converted into p-polarized light by modulation according to the image signal. The spatial light modulator 17G emits G light converted into p-polarized light by modulation. Thus, the G light modulated by the spatial light modulation device 17G enters the cross dichroic prism 18.

The B light transmitted through the B light transmitting dichroic mirror 14G enters the spatial light modulation device 17B that modulates the B light according to the image signal via the two relay lenses 16 and the two reflection mirrors 15. To do. The spatial light modulator 17B is a transmissive liquid crystal display device that modulates B light according to an image signal. The reason why the B light passes through the relay lens 16 is that the optical path length of the B light is longer than the optical path lengths of the R light and the G light. By using the relay lens 16, the B light transmitted through the B light transmitting dichroic mirror 14G is directly used as the spatial light modulation device 1.
7B.

  The B light incident on the spatial light modulator 17B is converted into s-polarized light. The s-polarized light incident on the spatial light modulator 17B is converted into p-polarized light and then incident on the liquid crystal panel. The p-polarized light incident on the liquid crystal panel is converted into s-polarized light by modulation according to the image signal. The spatial light modulator 17B emits B light converted into s-polarized light by modulation. In this way, the B light modulated by the spatial light modulator 17B enters the cross dichroic prism 18 which is a color synthesis optical system. The R light transmitting dichroic mirror 14R and the B light transmitting dichroic mirror 14G constituting the color separation optical system separate light supplied from the ultrahigh pressure mercury lamp 11 into R light, G light, and B light.

  The cross dichroic prism 18 which is a color synthesizing optical system is configured by arranging two dichroic films 18a and 18b perpendicularly to an X shape. The dichroic film 18a reflects B light and transmits R light and G light. The dichroic film 18b reflects R light and transmits B light and G light. Thus, the cross dichroic prism 18 combines the R light, G light, and B light modulated by the spatial light modulators 17R, 17G, and 17B, respectively.

  As described above, the light incident on the cross dichroic prism 18 from the spatial light modulator 17R and the spatial light modulator 17B is set to be s-polarized light. The light incident on the cross dichroic prism 18 from the spatial light modulator 17G is set to be p-polarized light. Thus, by making the polarization direction of the light incident on the cross dichroic prism 18 different, the light emitted from the spatial light modulators for each color light in the cross dichroic prism 18 can be effectively combined. The dichroic films 18a and 18b are generally excellent in the reflection characteristics of s-polarized light. For this reason, R light and B light reflected by the dichroic films 18a and 18b are s-polarized light, and G light transmitted through the dichroic films 18a and 18b is p-polarized light.

  The projection lens 20 projects the light combined by the cross dichroic prism 18 toward the reflection mirror 21. The reflection mirror 21 reflects the projection light from the projection lens 20 toward the screen 22. The screen 22 is a transmissive screen for displaying an image on the surface on the viewer side by transmitting video light that is light corresponding to an image signal. The screen 22 includes a Fresnel lens 30, a microlens array 40, a black matrix layer 60, and a substrate 50.

  The Fresnel lens 30 is an angle conversion unit that converts the light from the reflection mirror 21 into substantially parallel light. The Fresnel lens 30 has a plurality of prism portions 31. The plurality of prism portions 31 are arranged substantially concentrically. Each prism part 31 has the same shape as a ring-shaped piece cut out from the convex surface of the convex lens. The prism portions 31 are arranged at a pitch of 0.11 mm, for example. The Fresnel lens 30 angle-converts the image light into substantially parallel light by the prism portions 31 arranged substantially concentrically. In addition, the prism part 31 is not restricted to arrange | positioning in substantially concentric form, For example, it is good also as arrange | positioning in the ellipse shape which has a focus in substantially the same position.

  The microlens array 40 includes a plurality of microlens elements 41 provided in an array in the X direction, which is the first direction, and the Y direction, which is the second direction substantially orthogonal to the first direction. The X direction is the horizontal direction, and the Y direction is the vertical direction. The microlens element 41 has a first surface that is a spherical surface or an aspheric surface, and a substantially flat second surface. The microlens element 41 is provided with the first surface facing the light incident side from the Fresnel lens 30. The microlens array 40 diffuses the light from the Fresnel lens 30 on the observer OBS side by the refraction action of the microlens element 41. A substrate 50, which is a parallel flat plate made of a transparent member, is provided on the exit side surface of the screen 22. A black matrix layer 60 is provided between the microlens array 40 and the substrate 50.

  FIG. 2 shows a cross-sectional configuration of essential parts of the microlens array 40, the black matrix layer 60, and the substrate 50 in the screen 22. The black matrix layer 60 has an opening 62 and a light shielding part 61. The opening 62 transmits light from the microlens element 41 to the substrate 50 side. The light shielding portion 61 is provided in a lattice shape around the opening 62. The black matrix layer 60 is provided in order to reduce the reflection of the external light L2 toward the observer by absorbing the external light L2 with the light shielding unit 61. By reducing the reflection of the external light L2 by the black matrix layer 60, it is possible to reduce the decrease in the contrast of the image. The opening 62 is provided corresponding to the microlens element 41 of the microlens array 40 so as to be disposed in the vicinity of the focal position of each microlens element 41. The light L1 that has been collimated by the Fresnel lens 30 (see FIG. 1) is squeezed in the vicinity of the opening 62 by the refraction action of the microlens element 41 and then diffuses on the viewer side.

  FIG. 3 illustrates the configuration of the microlens element 41 and the opening 62 viewed from the Fresnel lens 30 side. The cross-sectional configuration shown in FIG. 2 is the AA cross-section of the configuration shown in FIG. The microlens element 41 has a hexagonal shape in which the length in the X direction that is the first direction is longer than the length in the Y direction that is the second direction substantially orthogonal to the first direction. The microlens array 40 is configured by arranging hexagonal microlens elements 41 in a honeycomb shape without gaps. Further, the opening 62 has a rectangular planar configuration having a long side in the X direction, which is the first direction, and a short side in the second direction.

  FIG. 4 shows a perspective configuration in which one microlens element 41, the opening 62 provided on the emission side, the light shielding unit 61, and the substrate 50 are combined. The microlens element 41 having a shape in which the length in the X direction is longer than the length in the Y direction causes image light to enter an irradiation region having a shape that is long in the X direction. The microlens element 41 has a long side in the X direction and a short side in the Y direction as long as the focus is formed in the vicinity of the opening 62 even when the focal point is not formed on the opening 62. The image light can be efficiently incident on the rectangular opening 62. Also, by providing the rectangular opening 62 that is long in the X direction, which is the horizontal direction, it is possible to improve the viewing angle characteristics in the horizontal direction. Thereby, video light can be transmitted efficiently and a good viewing angle characteristic can be obtained.

  The microlens array 40 is not limited to a configuration in which hexagonal microlens elements 41 are arranged in a honeycomb shape. The microlens array 40 may be configured to use microlens elements 41 having a shape other than the hexagonal shape as long as the microlens elements 41 having a length in the X direction longer than a length in the Y direction are arranged. The opening 62 only needs to have a shape in which the length in the X direction is longer than the length in the Y direction, and is not limited to a rectangular shape. The opening 62 may be, for example, a substantially rectangular shape in which the corners of the rectangular shape are changed to a circle, or an elliptical shape having a major axis in the X direction and a minor axis in the Y direction.

  FIG. 5 shows the relationship between the aperture ratio of the black matrix layer 60 and the viewing angle characteristics in the Y direction, which is the vertical direction. FIG. 6 shows the relationship between the aperture ratio of the black matrix layer 60 and the viewing angle characteristics in the X direction, which is the horizontal direction. The aperture ratio of the black matrix layer 60 is the ratio of the area of the opening 62 to the entire area of the black matrix layer 60. In the graph, α, β, and γ are 1/2, 1/3, and 1/10, respectively, when the luminance of the image light emitted in the normal direction of the screen 22 is 1. The angle is expressed with the normal direction of the screen 22 as 0 degree.

  “Dyeing” in FIG. 5 is to form a tint layer (colored layer) on the microlens element 41 instead of providing a black matrix layer with a light shielding portion and an opening. Here, α, β when the aperture ratio of the black matrix layer 60 is 40%, 30%, and 20%, respectively, as a comparative example, when there is no dyeing and when dyeing with a transmittance of 60% is performed. , Γ values. 5 and 6 that even when the aperture ratio of the black matrix layer 60 is 40% to 20%, the viewing angle characteristics in both the X direction and the Y direction are not significantly different from those in the comparative example.

  FIG. 7 shows the image light transmittance on the screen 22 and the reflectance of external light incident at 45 degrees in the Y direction when the aperture ratio of the black matrix layer 60 is changed. FIG. 8 shows the transmittance of the image light on the screen 22 and the reflectance of external light incident at 45 degrees in the X direction when the aperture ratio of the black matrix layer 60 is changed. As for the angle of the external light, the normal direction of the screen 22 is expressed as 0 degree. In the graphs shown in FIGS. 7 and 8, the transmittance of the image light is shown on the left scale, and the reflectance of the outside light is shown on the right scale. Here, the case where the dyeing | staining which makes the transmittance | permeability 60% is made into the comparative example. In the case of the comparative example, it can be seen that the transmittance of the image light is lower than when the black matrix layer 60 is provided. Further, even when the aperture ratio of the black matrix layer 60 is reduced from 40% to 20%, the image light transmittance does not change greatly, whereas the reflectance of external light is in the Y direction and the X direction. It can be seen that in any of the cases, it decreases to about one third.

  FIG. 9 shows the contrast obtained from the relationship between the image light transmittance and the external light reflectance shown in FIG. FIG. 10 shows the contrast obtained from the relationship between the image light transmittance and the external light reflectance shown in FIG. The contrast can be obtained by (external light reflectance) / (video light transmittance). It can be seen that the contrast is improved when the aperture ratio of the black matrix layer 60 is reduced from 40% to 20%. In addition, even when the aperture ratio of the black matrix layer 60 is changed from 20% to 40%, it is understood that the degree of contrast reduction is smaller in the horizontal direction shown in FIG. 10 than in the vertical direction shown in FIG. . Therefore, even when the rectangular opening 62 that is long in the horizontal direction is provided, it is possible to reduce the decrease in contrast.

  As described with reference to FIGS. 7 and 8, in the comparative example, the transmittance of the image light is lower than that in the case where the black matrix layer 60 is provided. In the comparative example, even when the same contrast as that when the black matrix layer 60 having an aperture ratio of 40% is used can be realized, the image becomes dark because the transmittance of the image light is small. Therefore, when the black matrix layer 60 having an aperture ratio of 20% to 40% is used, a brighter image can be displayed than in the comparative example.

  Some of the image light from the Fresnel lens 30, for example, light that has not been sufficiently collimated by the Fresnel lens 30, may travel from the microlens element 41 toward the light shielding unit 61. When the aperture ratio of the black matrix layer 60 is larger than 40%, for example, the image light absorbed by the light shielding portion 61 can be reduced and the image light can be transmitted efficiently. When the area of the opening 62 becomes larger and the area of the light-shielding part 61 becomes smaller, the external light reflected in the direction of the observer increases.

  In addition, when the aperture ratio of the black matrix layer 60 is smaller than, for example, 20%, it is possible to reduce external light reflected toward the viewer. When the area of the opening 62 is reduced, the image light absorbed by the light shielding unit 61 is increased. As described above, it is difficult to obtain a high-contrast image both when the aperture ratio of the black matrix layer 60 is too small and when it is too large. The screen 22 limits the area of the opening 62 occupying the black matrix layer 60 to 20% or more and 40% or less, thereby reducing the image light absorbed by the light shielding unit 61 and reflecting it toward the observer. Light can also be reduced.

  FIG. 11 shows the transmittance of the image light on the screen 22 and the reflectance of external light incident at 45 degrees in the Y direction when the transmittance of the light shielding unit 61 is changed. FIG. 12 shows the transmittance of the image light on the screen 22 and the reflectance of external light incident at 45 degrees in the X direction when the transmittance of the light shielding unit 61 is changed. Here, since the aperture ratio of the black matrix layer 60 is constant, the transmittance of the image light is substantially constant regardless of the change in the transmittance of the light shielding portion 61.

  The light shielding portion 61 can absorb external light more efficiently as the transmittance for transmitting light is lower. In this embodiment, the light shielding portion 61 is configured to have a transmittance of 0% to 40%. Accordingly, it is possible to efficiently absorb the external light by the light shielding unit 61 and reduce the external light reflected toward the observer. Furthermore, it is desirable that the light shielding unit 61 is configured so that the transmittance is 0% or more and 25% or less. Thereby, the external light reflected toward the observer can be further reduced.

  The screen 22 reduces the image light absorbed by the light-shielding part 61 and reflects the external light reflected in the direction of the observer by setting the area of the opening 62 in the black matrix layer 60 to 20% or more and 40% or less. Can also be reduced. Further, by using the light shielding unit 61 having a transmittance of 0% or more and 40% or less, it is possible to reduce external light reflected in the direction of the observer. A high-contrast image can be obtained by efficiently advancing the image light toward the viewer and reducing the external light reflected toward the viewer. Thereby, in the structure using the screen 22 provided with the microlens array 40, there exists an effect that a high contrast image can be displayed with a favorable viewing angle characteristic.

  As shown in FIGS. 13 and 14, the diffusion layers 132 and 142 may be provided in the vicinity of the black matrix layer 60. The diffusion layers 132 and 142 diffuse the image light from the microlens element 41. As the diffusion layers 132 and 142, for example, a layer in which a diffusing agent that diffuses light is dispersed, or a layer having a diffusion surface with minute irregularities can be used. Due to the refracting action of the microlens element 41, the image light is most narrowed in the vicinity of the opening 62. By providing the diffusion layers 132 and 142 in the vicinity of the black matrix layer 60, it is possible to make the image light in the most narrowed state enter the diffusion layers 132 and 142. For this reason, it is possible to reduce the image light that is diffused by the diffusion layers 132 and 142 and then enters the light-shielding portion 61, so that the image light can be transmitted efficiently.

  In the configuration shown in FIG. 13, the diffusion layer 132 is provided in the opening 62 of the black matrix layer 60. By providing the diffusion layer 132 in the opening 62, it is possible to reduce a decrease in contrast due to reflection of external light by the diffusion layer 132. In the configuration shown in FIG. 14, the diffusion layer 142 is provided on the incident side of the opening 62 of the black matrix layer 60. Even when the diffusion layer 142 is provided on the incident side of the opening 62, it is possible to reduce a decrease in contrast due to reflection of external light by the diffusion layer 142. By providing the diffusion layers 132 and 142, it is possible to reduce a decrease in contrast and obtain better viewing angle characteristics. The diffusion layer may be provided in the vicinity of the black matrix layer 60 and on the incident side of the opening 62 or a portion other than the opening 62. By providing a diffusion layer at least in the vicinity of the black matrix layer 60, it is possible to reduce the image light that is diffused by the diffusion layer and then enters the light shielding portion 61, and to efficiently transmit the image light.

  The projector 10 according to the above embodiment uses an ultrahigh pressure mercury lamp as a light source unit, but is not limited thereto. For example, a solid light emitting element such as a light emitting diode element (LED) may be used. Further, the projector is not limited to a so-called three-plate projector provided with three transmissive liquid crystal display devices, and may be a projector using a reflective liquid crystal display device or a projector using a tilt mirror device, for example.

  As described above, the screen according to the present invention is useful when used as a projector screen that transmits light according to an image signal.

1 is a diagram showing a schematic configuration of a projector according to an embodiment of the invention. The figure which shows the principal part cross-section structure of a screen. The figure explaining the structure of a micro lens element and an opening part. The figure which shows the perspective structure which match | combined the micro lens element, the opening part, the light-shielding part, and the board | substrate. The figure showing the relationship between the aperture ratio of a black matrix layer, and a viewing angle characteristic. The figure showing the relationship between the aperture ratio of a black matrix layer, and a viewing angle characteristic. The figure showing the transmittance | permeability of an image light, and the reflectance of external light. The figure showing the transmittance | permeability of an image light, and the reflectance of external light. The figure showing the relationship between the aperture ratio of a black matrix layer, and contrast. The figure showing the relationship between the aperture ratio of a black matrix layer, and contrast. The figure showing the transmittance | permeability of an image light, and the reflectance of external light. The figure showing the transmittance | permeability of an image light, and the reflectance of external light. The figure explaining the structure which provides a diffusion layer. The figure explaining the structure which provides a diffusion layer.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Projector, 11 Super high pressure mercury lamp, 12 Integrator, 13 Polarization conversion element, 14R R light transmission dichroic mirror, 14GB light transmission dichroic mirror, 15 Reflection mirror, 16 Relay lens, 17R, 17G, 17B Spatial light modulation device, 18 Cross dichroic prism, 18a, 18b Dichroic film, 20 projection lens, 21 reflection mirror, 22 screen, 30 Fresnel lens, 31 prism part, 40 micro lens array, 41 micro lens element, 50 substrate, 60 black matrix layer, 61 light shielding part 62 Opening, OBS observer 132, 142 Diffusion layer

Claims (6)

A plurality of microlens elements provided in an array;
An aperture that transmits light from the microlens element, and a black matrix layer that includes a light-shielding portion provided around the aperture,
The opening is provided to be disposed in the vicinity of the focal position of the microlens element,
In the black matrix layer, the area of the opening occupies 20% or more and 40% or less of the entire area of the black matrix layer.   2. The screen according to claim 1, wherein the light-shielding part has a light transmittance of 0% to 40%.   3. The opening and the microlens element have a shape in which a length in a first direction is longer than a length in a second direction substantially orthogonal to the first direction. As described in the screen. Having a diffusion layer that diffuses light;
The screen according to claim 1, wherein the diffusion layer is provided in the vicinity of the black matrix layer.   The screen according to claim 4, wherein the diffusion layer is provided on an incident side of the opening or on the opening. A spatial light modulator that modulates light from the light source unit according to an image signal;
An image display device comprising: the screen according to claim 1.

Images