JP2006227244A - Display device and projector using the same - Google Patents

Abstract

【Task】
Providing a display device that forms a high-quality image with sufficient brightness without black lattice pattern being visible on the screen due to the difference in specific visibility, and a projector using this display device To do.
[Solution]
By appropriately setting the area ratio of the aperture areas of the microlenses 33r, 33g, and 33b according to the wavelength distribution characteristic unique to the light source, bright and white-balanced image light is formed, and the microlens 33r, By adjusting the optical axis direction of 33g, 33b, the projection light of each color from each filter element 32r, 32g, 32b is superimposed at the projection pixel position, so that a black grid on the screen is not generated.
[Selection]
FIG.

Description

  The present invention relates to a display device having a liquid crystal panel and a projector, and more particularly to a display device having a microlens array and displaying a color image with a color filter including a plurality of color elements.

  As a prior art, a projection type liquid crystal display device using a color filter type liquid crystal panel is known (for example, Patent Document 1).

  A liquid crystal panel is also known that controls the amount of light of each color by changing the area ratio of the filter pixels of the color filter in accordance with the wavelength distribution characteristics of the light source (Patent Document 2).

  Further, although not a liquid crystal display device as described above, an image display device is known that changes the area ratio of three primary color phosphors in a combination of electrons emitted from an electron source and a phosphor screen (Patent Document 3). ).

On the other hand, a liquid crystal panel in which a microlens array is incorporated in order to increase the light collection efficiency is also known (Patent Document 4).
JP-A-5-341260 Japanese Utility Model Publication No. 6-23035 JP 2000-217125 A JP 2003-287603 A

  However, when a display device using a color filter type liquid crystal panel is used as, for example, a projector, even when white is projected, among the pixels that form a color image, for example, blue and red portions Since the relative visual sensitivity is lower than that of color and it looks dark even at the same brightness, there is a problem that these appear to be black grids on the screen. In such a display device, since a color filter is used, the light transmittance is not sufficient, and the brightness of the display may be restricted. For example, the light amount of a light source such as a mobile phone is limited. In a small display device, when it is used in a bright place, there is a problem that sufficient brightness cannot be obtained only with light from the light source.

  Also, when changing the area ratio of the filter pixels of the color filter in accordance with the wavelength distribution characteristics of the light source, for example, white balance can be adjusted by controlling the amount of light of each color, but the difference in relative visibility It is not always possible to make the black lattice pattern formed by Further, since the color filter is used, the transmittance may not be sufficient.

  Further, the technology for changing the area ratio of the three primary color phosphors of the phosphor screen is for a self-luminous image display device that emits light by colliding electrons with the phosphor. On the other hand, in a projector using a color filter type liquid crystal panel, the liquid crystal panel is not a self-luminous type and requires a separate light source. Therefore, each light source used has a unique wavelength distribution characteristic, and the technology cannot be applied as it is.

  Therefore, the present invention provides a display device that forms a high-quality image with sufficient brightness, without causing a black lattice pattern to be seen on the screen due to a difference in specific visibility. An object of the present invention is to provide a projector using the projector.

  In order to solve the above problems, a display device according to the present invention includes a light source device that emits color light components of a plurality of colors and a plurality of display pixels that include a liquid crystal sandwiched between a pair of substrates. A panel, a color filter that is formed on one side of the liquid crystal panel and includes color elements of a plurality of colors that respectively form display areas corresponding to a plurality of display pixels, and a display that is provided corresponding to the plurality of display pixels And a microlens array including a plurality of microlenses having different characteristics corresponding to the type of pixel. Here, the color elements of multiple colors include, for example, three primary colors of light such as red, green, and blue.

  Since the microlens array has different characteristics corresponding to the type of display pixel, it is possible to perform optical adjustment such as adjustment of the light amount and projection direction for each of a plurality of color lights, as well as white balance and the like. The display state can also be adjusted. As a result, it is possible to form an image with high display quality that has sufficient brightness by efficient use of illumination light or does not show a black lattice pattern on the screen due to a difference in specific visibility. It becomes.

  As a specific aspect of the present invention, the microlens array has characteristics set for each color corresponding to the color elements of a plurality of colors of the color filter. In this case, the characteristics of the microlens array can be set so as to cancel the display conditions, for example, according to the specific display conditions determined for each color element of a plurality of colors. Note that “setting a characteristic for each color” means that a characteristic related to at least one color is different from a characteristic related to another color.

  Moreover, as a specific aspect of the present invention, the microlens array has characteristics set for each color corresponding to the characteristics of the color light components of a plurality of colors included in the light source device. In this case, the characteristics of the microlens array can be set, for example, so as to cancel the display conditions according to the display conditions determined by the characteristics of the color light components of a plurality of colors included in the light source device.

  As a specific aspect of the present invention, the plurality of microlenses each have an opening area set for each of the plurality of display pixels in accordance with the energy ratio of the color light components of the plurality of colors. In this case, white balance and the like can be adjusted by setting the ratio of the aperture area of each microlens according to the energy ratio of the color light component. More specifically, for example, if the ratio of the opening area corresponding to one predetermined color among the plurality of colors is made larger than the ratio of the opening areas of the other colors, the energy ratio of the color light component emitted from the light source device Thus, the extraction ratio of the color light component of the predetermined color can be made larger than the extraction ratio of the other color light components.

  As a specific aspect of the present invention, the opening area of the display pixel corresponding to at least one predetermined color among the plurality of colors is larger than the pixel area of the display pixel. In this case, by increasing the aperture area corresponding to the color, it is possible to secure the energy of the color light component of the color, and to adjust white balance and the like without increasing the pixel area of the display pixel.

  Further, as a specific aspect of the present invention, the plurality of microlenses have optical axis directions set for each of the plurality of display pixels. In this case, the optical path of the projection light can be appropriately adjusted for each color light.

  As a specific aspect of the present invention, a plurality of color elements include three primary colors of red, green, and blue light, and a plurality of display areas collectively combine color elements including the corresponding three colors. The region is formed, and the optical axis direction is set so that light rays from the display pixels corresponding to the respective display regions of the composite region are incident on substantially the same location with reference to the projection pixel position. In this case, the projection light of each color can be superposed at the projection pixel position.

  As a specific aspect of the present invention, two or more microlenses are arranged adjacent to each other so as to face each display pixel of a predetermined color. In this case, the display by the color element can be divided or diffused.

  As a specific aspect of the present invention, a plurality of display pixels are arranged in any one pattern of a staggered pattern and a delta pattern. In this case, the light source light can be used more efficiently.

  A projector for solving the above problems includes any one of the display devices described above and a projection optical system that projects image light formed by the display device as projection light. In this case, the projector has sufficient brightness and can form an image with high display quality so that a black lattice pattern does not appear on the screen due to a difference in specific visibility.

[First Embodiment]
FIG. 1 is a diagram for explaining a projector incorporating the display device of the first embodiment. The projector 100 in this embodiment includes a display device 50 and a projection lens 60 that is a projection optical system. Further, the display device 50 includes the light source device 10, the expansion lens 20, and the liquid crystal light valve 30. A projection image is formed on the screen SR by the projection light projected from the projection lens 60 of the projector 100.

  In the display device 50, the light source device 10 includes an illumination unit 11 including a light source, a substrate 12, and a cooling fin 13 that is a heat dissipation device. The illumination unit 11 includes an LED 14 and an illumination light forming optical system 15 inside. The LED 14 that is a light source generates light source light having a light quantity sufficient to form image light. The illumination light forming optical system 15 generates light source light. Is made uniform in the cross section of the light beam, and illumination light to be irradiated to the liquid crystal light valve 30 is formed. The board 12 has a circuit pattern for wiring for supplying power to the LEDs 14 on the surface, and the illumination unit 11 is mounted thereon. The cooling fin 13 radiates heat generated when the light source light is generated in the illumination unit 11 by air cooling.

  Here, a white light source in which a yellow phosphor and a blue light emitting diode are combined is used as the LED 14. In this case, the amount of blue light is greater than the amount of other color light. In addition to this, for example, the LED 14 may be a combination of light emitting diodes of three colors of blue light, red light, and green light.

  The extension lens 20 is a lens that optically extends the section of the illumination light beam. The expansion lens 20 can efficiently illuminate the entire surface of the liquid crystal light valve 30.

  The liquid crystal light valve 30 includes a liquid crystal panel 31, a color filter 32, a microlens array 33, and a polarizer 40 and an analyzer 41 that are polarizing filters. The liquid crystal panel 31 has a plurality of display pixels including a liquid crystal sandwiched between a pair of substrates, and illuminates in units of display pixels according to a drive signal or an image signal input as an electrical signal. The modulated light is formed from the illumination light by adjusting the polarization state of the light. The color filter 32 is formed on one transparent substrate of the liquid crystal panel 31, and the three primary colors red, green, and blue are regularly arranged corresponding to each of the plurality of display pixels, and the red, green, One color display pixel is formed by a lump of blue. The microlens array 33 is formed adjacent to the color filter 32, and is formed of a plurality of microlenses having characteristics set according to the type of display pixel of each color (details will be described later with reference to FIG. 2). ).

  The liquid crystal light valve 30 limits the polarization direction of the illumination light incident by the built-in polarizer 40 to a specific direction. Further, the liquid crystal light valve 30 condenses illumination light composed of polarization components limited to a specific direction by the microlens array 33, forms color light of each color by the color filter 32, and color light of each color by the liquid crystal panel 31. The modulated light is formed from the illumination light and is emitted. Further, the liquid crystal light valve 30 forms image light by selecting a polarization component in a specific direction from the modulated light formed as color light of each color by the built-in analyzer 41. Note that the transmission amount of light of each color is controlled by transmitting a drive signal to each pixel of the liquid crystal panel 31 by a drive circuit (not shown) of the liquid crystal light valve 30.

  The projection lens 60 projects the color image light formed by the liquid crystal light valve 30 onto the screen SR as projection light at an appropriate magnification.

  Hereinafter, the function of the projector 100 in the present embodiment will be described in the order of the optical path. Each color light emitted from the LED 14, that is, light source light including each color light component is first uniformized in the cross section of the light beam by the illumination light forming optical system 15, thereby forming illumination light. The formed illumination light is optically stretched by the stretching lens 20. That is, the reduction ratio is adjusted according to the contour of the image to be projected. The optically expanded illumination light is first adjusted in polarization direction in the liquid crystal light valve 30, collected by the microlens array 33, converted into color light of each color by the color filter 32, and electrically converted by the liquid crystal panel 31. The polarization state is adjusted on a pixel-by-pixel basis in accordance with the drive signal or image signal input as the target signal. Further, the light whose polarization state is adjusted is extracted as a component of a predetermined polarization direction and emitted as image light. The emitted image light is projected onto the screen SR as projection light by the projection lens 60, and a color image having a desired magnification is displayed on the screen SR.

  In this embodiment, the expansion lens 20 is provided. However, depending on the shape of the image portion of the liquid crystal light valve 30, the optical expansion may not be necessary. In this case, the expansion lens 20 is not necessary.

  In the present embodiment, the LED 14 including a light emitting diode is used as the light source of the light source device 10. However, the light source is not limited to this, and any light source light that generates a sufficient amount of light for image light formation may be used. Good. As an example other than the light emitting diode, for example, a high-pressure mercury lamp may be used.

  FIG. 2 is a cross-sectional view for explaining the structure of the liquid crystal light valve 30 which is a main part of the display device 50 according to the present embodiment. The liquid crystal light valve 30 includes a liquid crystal panel 31, a color filter 32, a microlens array 33, and a polarizer 40 and an analyzer 41 that are polarizing filters. Here, the liquid crystal panel 31 includes glass substrates 34 and 35 and a display layer 36.

  In the liquid crystal panel 31, the glass substrates 34 and 35 are both formed of a transparent glass plate, are arranged to face each other as a pair of substrates, and sandwich the display layer 36. The display layer 36 is a main part of a function as a so-called liquid crystal panel of an active matrix driving method using TFT (thin film transistor) driving. The display layer 36 includes a plurality of display pixels 37 of the same size that include liquid crystal molecules and constitute a plurality of pixels, and a black matrix portion 38 that includes a drive circuit including TFTs and that includes a black matrix that conceals them. Prepare. Transparent electrodes are formed on the opposing surfaces of both the substrates 34 and 35, whereby a predetermined voltage is applied to the display layer 36 in units of pixels, and liquid crystal molecules in the display pixels 37 are controlled to form a display panel. To play a role. The black matrix portion 38 that partitions the display pixels 37 is a light shielding portion that blocks light around the pixels.

  The color filter 32 regularly arranges the three primary colors of red, green, and blue corresponding to each of the plurality of display pixels 37, and displays the combined region 32c in a lump of red, green, and blue as one color display. Each pixel is formed as a pixel (a unit by a dotted line in the figure). In each synthesis region 32c, filter elements 32r, 32g, and 32b made of red, green, and blue color elements are formed corresponding to the display pixels 37r, 37g, and 37b, respectively. Each filter element 32r, 32g, 32b corresponds to a display area.

  The microlens array 33 has a plurality of microlenses 33r, 33g, and 33b corresponding to the display pixels 37r, 37g, and 37b and the filter elements 32r, 32g, and 32b, respectively, and is formed as a two-dimensional array of these. ing.

  Here, the shape of the microlens array 33 in the present embodiment will be described. First, among the microlenses 33r, 33g, and 33b forming the microlens array 33, the green microlens 33g is larger than the red and blue microlenses 33r and 33b. Thereby, since the aperture area of the micro lens 33g becomes larger than the aperture area of the other lens, the extraction ratio of the green light color light component in the green filter element 32g with respect to the light source light is larger than that of the other color light components. Can be set.

  Furthermore, here, the optical axes RL, GL, and BL of the respective colors corresponding to the micro lenses 33r, 33g, and 33b are set in different optical axis directions. In particular, here, the other optical axes RL and BL are adjusted based on the optical axis GL. That is, the reference point F is set at a predetermined position on the extension of the optical axis GL, and the optical axis directions of the optical axes RL and BL are set so as to intersect the reference point F. Thereby, for example, when one color display pixel formed by the synthesis region 32c is projected as one projection pixel on the screen SR in FIG. 1, the projection pixel is formed in a state where each color light is superimposed. Yes (details below).

  Hereinafter, the process of forming image light by the liquid crystal light valve 30 of FIG. 2 will be described in the order of the optical path. First, the polarization direction of the illumination light incident on the liquid crystal light valve 30 is limited to a specific direction by the polarizer 40 built in the liquid crystal light valve 30. Such illumination light is further divided and condensed individually by the micro lenses 33r, 33g, and 33b according to the incident area when entering the micro lens array 33, and red by the filter elements 32r, 32g, and 32b, respectively. Green, blue color light is formed. Here, the color light of each color is represented by the optical axes RL, GL, and BL. Of the illumination light, for example, the green light GL is collected by the micro lens 33g and formed by passing through the filter element 32g corresponding to the green color element of the color filter 32. Further, the green light GL is modulated by the display pixel 37g to form modulated light. Similarly, the red light RL and the blue light BL are also condensed by the microlenses 33r and 33b, formed by passing through the filter elements 32r and 32b, and further modulated by the display pixels 37r and 37b. Light is formed. The modulated light of each color formed as described above forms image light by selecting a polarization component in a specific direction by an analyzer 41 built in the liquid crystal light valve 30.

  Here, the image light of each color formed and emitted by the liquid crystal light valve 30 is superimposed at a reference point F that is an intersection of the optical axes RL, GL, and BL. The reference point F is a virtual point for superimposing the image lights of the respective colors. For example, the optical points RL, GL, and BL are used in accordance with actual projections such as the projector 100 shown in FIG. The optical axis direction may be set as appropriate. Hereinafter, the case where the optical axis direction is set in the projector 100 of FIG. 1 will be described. First, a projection pixel is formed on the screen SR from one color display pixel formed by the synthesis region 32c through the projection lens 60 and the like. At this time, with respect to the projection pixel position of the projection pixel projected on the screen SR, the light of each of the optical axes RL, GL, and BL so that the projection light of each color light that forms the projection pixel enters substantially the same location. Set the axial direction. In this case, the projection light of each color that has passed through the filter elements 32r, 32g, and 32b and the display pixels 37r, 37g, and 37b can be superposed at the projection pixel position.

  FIG. 3A is a diagram for explaining an example of a projection pixel projected on the screen SR in FIG. In the region for forming the projection pixel at the projection pixel position on the screen SR in FIG. 1, the regions of the respective colors corresponding to the display pixels 37r, 37g, and 37b are set as the projection regions R, G, and B, respectively. In FIG. 3A, among each color light, the green projection area G (area surrounded by a solid line in the figure) having the highest relative visibility is the widest, and the red and blue projection areas R having a relatively low relative visibility. B (regions surrounded by a one-dot chain line and a broken line in the drawing) is superimposed so as to be included in the projection region G. As a result, the blue and red parts that appear dark even when the brightness is the same as that of green because the specific visibility is low do not exist independently, so that a black grid on the screen due to the part does not occur. Can be. Note that the positional relationship between the projection regions R, G, and B in FIG. 3A is merely an example, and any other relationship may be used as long as there is no problem in forming a desired image. For example, as shown in FIG. Things are also envisaged.

  Returning to FIG. 2, the opening area of each of the microlenses 33r, 33g, and 33b, which is a further feature of the shape of the microlens array 33 in the present embodiment, will be described. In the present embodiment, in the microlens array 33, the opening area of the microlens 33g corresponding to the display pixel 37g is larger than those of the other microlenses 33r and 33b. The display pixel 37g corresponds to a filter element 32g which is a green color element among the color elements in the color filter 32. Therefore, in this case, the extraction ratio of the green light color light component to the light source light is set to be larger than that of the other color light components. Further, due to the light condensing effect by the micro lens 33g, the color light component of the green light is transmitted through the display pixel 37g without being blocked by the black matrix portion 38 with respect to the ambient light, and is used without waste.

  The microlens array 33 including microlenses 33r, 33g, and 33b having different sizes for each color is produced by, for example, producing a master from a glass plate by laser processing or the like, and further producing a master mold by nickel electroforming. And it can produce by pressing the raw material of microlens array 33, such as resin, using the said type | mold.

  On the other hand, for example, a white light source combining a yellow phosphor and a blue light emitting diode is used for the LED 14 (see FIG. 1) that generates light source light. In this case, generally, the amount of blue light is different from that of other light sources. More than the amount of colored light. Therefore, the microlens 33r, so that image light with appropriate white balance can be formed by adjusting the light amount with reference to the light amount of each color light component included in the LED 14 and taking into account the energy ratio of the light source light. The area ratio of the opening areas of 33g and 33b can be set. Therefore, in this case, a larger amount of green light can be captured by increasing the aperture area of the microlens 33g, thereby achieving an appropriate white balance. As a guideline in this case, the area ratio of the opening areas of the microlenses 33r, 33g, and 33b of the respective area ratios is approximately 1: 1 with the area ratio of the opening area of the microlens 33r and the opening area of the microlens 33g. It is appropriate to set the area ratio of the opening area display of the micro lens 33b and the opening area of the micro lens 33g to about 1: 2 to 1: 4.

  At this time, even if the aperture area of the micro lens 33g is large, by providing an appropriate curvature, green light can be condensed by the micro lens 33g when entering the display pixel 37g. It is not necessary to enlarge the pixel 37g. That is, the display pixels 37r, 37g, and 37b are all equal in size.

  In addition to this, for example, when a high-pressure mercury lamp or the like is used instead of the LED 14 as the light source, the area ratio of the aperture areas of the microlenses 33r, 33g, and 33b as appropriate according to the wavelength distribution characteristic unique to the light source to be used. The same effect can be obtained by setting. Conversely, as the LED 14, a combination of light emitting diodes of three colors of blue light, red light, and green light is used, and each color of each color is adjusted in accordance with the area ratio of the opening areas of the microlenses 33 r, 33 g, and 33 b. It is also possible to adjust the light emission amount of the light emitting diode. In any case, the optical adjustment of the optical axis direction and curvature of each of the micro lenses 33r, 33g, and 33b is possible, and, for example, for the projection regions R, G, and B, green with high relative visibility is obtained. It is also possible to superimpose so that red and blue projection areas R and B having the largest projection area G and relatively low relative visibility are included in the projection area G.

  Here, in order to use the light source light more efficiently, a staggered pattern or a delta pattern can be used as the arrangement pattern of the synthesis region 32c in FIG. FIG. 4A shows the arrangement of the microlens array 133 when the synthesis region 132c is arranged in a staggered pattern, and FIG. 4B shows the microlens array when the synthesis region 232c is arranged in a delta pattern. The arrangement of H.233 is shown. Note that the shape of the microlens 33g and the like is not limited to a circle, and may be a polygon or the like, for example, and the boundary region that is a gap between the microlenses can be further reduced. Thereby, the utilization efficiency of light source light can be improved.

  In the case of FIG. 4A, the staggered arrangement pattern prevents the microlenses 33g having the maximum diameter from being aligned in a straight line, so that the gaps between the microlenses 33r, 33g, and 33b are smaller than the stripe type. As a result, the boundary area can be reduced, and the light source light utilization efficiency can be further increased. Furthermore, in the case of FIG. 4B, the microlenses 33r, 33g, and 33b can be arranged more densely. The arrangement pattern of each microlens array described above is an example, and other arrangement patterns may be used as long as the arrangement pattern can be matched with the arrangement pattern of each synthesis region 32c.

  When a stripe arrangement pattern is used as the arrangement pattern of the synthesis region 32c, the microlenses 33r, 33g, and 33b are arranged in a straight line, so that the raw material is changed for each of the microlenses 33r, 33g, and 33b. It is also possible to adjust the refractive index. Even in the stripe type arrangement pattern, the shape of the microlens to be used is not limited to a circle, but may be a polygon or the like, for example, and the boundary region that is a gap between the microlenses can be further reduced.

  As is apparent from the above description, the display device 50 according to the present embodiment and the projector 100 using the same can first use light source light without waste due to the light condensing effect of the microlenses 33r, 33g, and 33b. Further, by appropriately setting the area ratio of the opening areas of the micro lenses 33r, 33g, and 33b according to the wavelength distribution characteristic specific to the light source, the light amount can be adjusted in consideration of the energy ratio of the light source light, and an appropriate white balance can be adjusted. It is possible to form a well-defined image light. Furthermore, by adjusting the optical axis direction of the micro lenses 33r, 33g, and 33b, the projection light of each color from the filter elements 32r, 32g, and 32b can be superimposed at the projection pixel position, and it looks dark. The blue and red parts are not present alone. As a result, it is possible to form an image with high display quality that has sufficient brightness and does not show a black lattice pattern on the screen due to a difference in specific visibility.

  In FIG. 2, a microlens array 33 is provided in front of the glass substrate 34 positioned on the incident side, but a microlens array or microprism array is also provided in the subsequent stage of the glass substrate 35 positioned on the emission side. It may be provided. In this case, by providing a microlens array or the like subsequent to the glass substrate 35, it is possible to further adjust the optical axis directions of the optical axes RL, GL, and BL. Further, the color filter 32 may be provided in the subsequent stage of the display layer 36. In this case, the shape of each filter element 32r, 32g, 32b may be matched to the display pixels 37r, 37g, 37b, respectively.

[Second Embodiment]
FIG. 5A is a cross-sectional view for explaining the structure of the liquid crystal light valve 530 which is a main part of the display device according to the second embodiment. The liquid crystal light valve 530 includes a liquid crystal panel 531, a color filter 532, a microlens array 533, a polarizer 540 that is a polarization filter, and an analyzer 541. The liquid crystal panel 531 includes glass substrates 534 and 535 and a display layer 536. Further, the display layer 536 includes display pixels 537 and a black matrix portion 538. In addition, about each component, except the shape of the microlens array 533, the thing of the same name is the same as that of 1st Embodiment, and the description is abbreviate | omitted.

  Here, the shape of the microlens array 533 in the present embodiment will be described. The microlens array 533 includes a microlens 533g formed of a single lens and a microlens group 533r and 533b in which a plurality of lenses are arranged in parallel as display pixels 537r, 537g, and 537b and filter elements 532r, 532g, and 532b, respectively. It is formed by correspondingly arranging it two-dimensionally. FIG. 5B is a front view of one section of the microlens array 533 divided by a dotted line in FIG. In this case, for example, since each of the lenses 1b to 4b forming the microlens group 533b has an optical axis, the optical axis direction can be set for each lens. The same applies to the lenses 1r to 4r of the microlens group 533r.

  FIG. 6 is a diagram for explaining the projection pixel in the present embodiment. When forming projection light using the display device according to the present embodiment, regions where red and blue are projected in the projection pixels on the screen SR in FIG. 1 correspond to the lenses 1r to 4r and the lenses 1b to 4b, respectively. Projection regions R1 to R4 and projection regions B1 to B4. In addition, a region in which green is projected corresponding to the microlens 533g is defined as a projection region G. In this case, since the red and blue portions having low specific visibility can be further subdivided, the portions can be made less noticeable. Note that the positional relationship between the projection regions R1 to R4 and B1 to B4 in FIG. 6 is merely an example as in the case of FIGS. 3A and 3B, and may be other than this.

  Further, the projection area can be further subdivided by further increasing the number of lenses in the microlens groups 533r and 533b per section of the microlens array 533. By increasing the number of lenses, a diffusion effect can also be expected. If the diffusion effect is sufficient, red and blue portions with low specific visibility can be made inconspicuous even when the projection area is not superimposed.

[Third Embodiment]
FIG. 7 is a diagram for explaining a usage example of the display device according to the first and second embodiments. Up to this point, the effects of the projector 100 shown in FIG. 1 have been described. However, the display device according to the present invention can be used not only for projectors but also for other display devices. FIG. 7 is a diagram for explaining a backlight type direct-view image display device 750. The image display device 750 includes a display device body 701, a light source 714, a light guide plate 751, a liquid crystal light valve 730, and a front panel 752.

  The liquid crystal light valve 730 further includes a color filter 732 and a microlens array 733.

  The light source 714 generates light source light, and the light guide plate 751 guides the light source light from the light source 714 and uniformly enters the back surface of the liquid crystal light valve 730 as illumination light. The liquid crystal light valve 730 forms desired image light by the built-in color filter 732, the microlens array 733, and the like, and displays an image. A user of the image display device 750 can view the displayed image through the front panel 752. Here, the liquid crystal light valve 730 has the same structure as the liquid crystal light valve 30 used in the first embodiment and the liquid crystal light valve 530 in the present embodiment, thereby forming an image with sufficient brightness and high display quality. can do. Further, in all the embodiments of the present invention, for example, by changing the size of the pixel region (see FIG. 2 and the like) built in the liquid crystal light valves 30 and 730 for each color, a black lattice pattern cannot be seen on the screen. It can also be made inconspicuous.

It is a figure for demonstrating the projector incorporating the display apparatus which concerns on 1st Embodiment. It is sectional drawing for demonstrating the structure of the principal part of the display apparatus which concerns on 1st Embodiment. (A), (b) is a figure for demonstrating the projection pixel which concerns on 1st Embodiment. (A), (b) is a figure for demonstrating arrangement | positioning of the microlens array which concerns on 1st Embodiment. (A), (b) is a figure for demonstrating the structure of the principal part of the display apparatus which concerns on 2nd Embodiment. It is a figure for demonstrating the display pixel in the display apparatus which concerns on 2nd Embodiment. It is a figure for demonstrating the usage example of the display apparatus which concerns on 1st and 2nd embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 ... Projector, 10 ... Light source device, 60 ... Projection lens, 50 ... Display apparatus, 30 ... Liquid crystal light valve, 31 ... Liquid crystal panel 31, 32 ... Color filter, 33 ... Micro lens array, 33r, 33g, 33b ... Micro lens 32r, 32g, 32b ... Filter elements, 37r, 37g, 37b ... Display pixels, R, G, B ... Projection area, SR ... Screen

Claims (10)

A light source device that emits color light components of a plurality of colors;
A liquid crystal panel having a plurality of display pixels including a liquid crystal sandwiched between a pair of substrates;
A color filter that is formed on one side of the liquid crystal panel and includes color elements of the plurality of colors that respectively form display areas corresponding to the plurality of display pixels;
A display device comprising: a microlens array including a plurality of microlenses provided corresponding to the plurality of display pixels and having different characteristics corresponding to types of the display pixels.   The display device according to claim 1, wherein the microlens array has a characteristic set for each color corresponding to the color elements of the plurality of colors of the color filter.   The said micro lens array has the characteristic set for every color corresponding to the characteristic of the color light component of the said multiple colors which the said light source device has, The Claim 1 characterized by the above-mentioned. Display device.   The plurality of microlenses each have an opening area set for each of the plurality of display pixels in accordance with an energy ratio of the color light components of the plurality of colors. The display device according to item.   The display device according to claim 4, wherein the opening area is larger in a display pixel corresponding to at least one predetermined color of the plurality of colors than a pixel region of the display pixel.   The display device according to claim 1, wherein the plurality of microlenses have optical axis directions set for the plurality of display pixels, respectively.   The color elements of the plurality of colors include three primary colors of red, green, and blue light, and the display area collectively forms a combined area of the color elements including the corresponding three colors, and the optical axis direction is The display device according to claim 6, wherein light beams from the display pixels corresponding to the display areas of the synthesis area are set to be incident on substantially the same location with respect to a projection pixel position.   8. The display device according to claim 1, wherein two or more microlenses are arranged adjacent to each other so as to face display pixels of a predetermined color.   The display device according to any one of claims 1 to 8, wherein the plurality of display pixels are arranged in any one pattern of a staggered pattern and a delta pattern. A display device according to any one of claims 1 to 9,
A projector comprising: a projection optical system that projects image light formed by the display device as projection light.

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